❓ Hon Sophia Moermond inquired about water testing in Lefroy Brook following the Pemberton Timber Mill fire. The response details historical testing data from 1990 to 2021, including locations, frequency, and results for various contaminants.
AnsweredQoN 1280Legislative Council
QuestionView source ↗
I refer to the Pemberton Timber Mill fire on 9 December 2022, in particular the adjacent Lefroy Brook, and I ask:
(a) has testing been done on Lefroy Brook for further contaminants at the Pemberton Mill site since the fire;
(b) was testing done on Lefroy Brook at the Pemberton Mill site previous to the fire;
(c) if so, what are the locations and frequency of water testing; and
(d) if testing was conducted, what were the results?
(a) has testing been done on Lefroy Brook for further contaminants at the Pemberton Mill site since the fire;
(b) was testing done on Lefroy Brook at the Pemberton Mill site previous to the fire;
(c) if so, what are the locations and frequency of water testing; and
(d) if testing was conducted, what were the results?
AnswerView source ↗
Answered
23 March 2023
Responded by
Parliamentary Secretary representing the Minister for Environment
Response time
6 days
(b) Yes (c)-(d) Testing of surface water in Lefroy Brook near the Pemberton Timber Mill site has been undertaken at various times, and for various substances, between late 1990 and March 2021. The results in tables below are from reports on contamination investigations of the Pemberton Mill site and associated former waste disposal areas held on the Department of Water and Environmental Regulation’s records. The results below are arranged by sampling location from upstream to downstream. In the tables, mg/L is milligrams per litre, µg/L is micrograms per litre, and µS/cm is microSiemens per centimetre. Results preceded by ‘<’ were below the analytical laboratory’s limit of reporting and ‘-’ indicates a substance was not tested. Lefroy Brook upstream of Pump Hill Road Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.003 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 0.01 Copper (mg/L) 0.02 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) 60 - - - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Feb 1993 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.049 <0.001 <0.05 <0.02 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - - - Lefroy Brook west of Department of Primary Industries and Regional Development aquaculture facility, upstream of timber mill Substance (Unit of measurement) Dec 2020 Mar 2021 Arsenic (mg/L) <0.001 <0.001 Chromium (mg/L) <0.001 <0.001 Chromium (Hexavalent) (mg/L) <0.005 <0.005 Pentachlorophenol (µg/L) <2 <5 Lefroy Brook near northern boundary of Lot 7396, upstream of timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 5.8 Electrical Conductivity (µS/cm) - - - - 88 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) <0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 0.002 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook west of Lot 7396 and timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 7.1 Electrical Conductivity (µS/cm) - - - - 470 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) 0.002 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook upstream of Vasse Highway Substance (Unit of measurement) Nov 1990 Dec 1990 Jun 1991 Aug 1991 Jul 1992 Jul 1995 May 1996 Arsenic (mg/L) 0.15 0.034 0.11 0.206 0.05 0.03 <0.02 Chromium (mg/L) <0.1 <0.1 <0.01 <0.05 <0.01 <0.01 <0.02 Copper (mg/L) <0.01 <0.01 - - - 0.26 <0.02 Pentachlorophenol (µg/L) <0.1 9.7 <0.1 - - - - Total Petroleum Hydrocarbon (µg/L) <10 - - - - - - Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.002 - - Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) 0.002 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
(c)-(d) Testing of surface water in Lefroy Brook near the Pemberton Timber Mill site has been undertaken at various times, and for various substances, between late 1990 and March 2021. The results in tables below are from reports on contamination investigations of the Pemberton Mill site and associated former waste disposal areas held on the Department of Water and Environmental Regulation’s records. The results below are arranged by sampling location from upstream to downstream. In the tables, mg/L is milligrams per litre, µg/L is micrograms per litre, and µS/cm is microSiemens per centimetre. Results preceded by ‘<’ were below the analytical laboratory’s limit of reporting and ‘-’ indicates a substance was not tested. Lefroy Brook upstream of Pump Hill Road Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.003 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 0.01 Copper (mg/L) 0.02 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) 60 - - - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Feb 1993 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.049 <0.001 <0.05 <0.02 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - - - Lefroy Brook west of Department of Primary Industries and Regional Development aquaculture facility, upstream of timber mill Substance (Unit of measurement) Dec 2020 Mar 2021 Arsenic (mg/L) <0.001 <0.001 Chromium (mg/L) <0.001 <0.001 Chromium (Hexavalent) (mg/L) <0.005 <0.005 Pentachlorophenol (µg/L) <2 <5 Lefroy Brook near northern boundary of Lot 7396, upstream of timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 5.8 Electrical Conductivity (µS/cm) - - - - 88 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) <0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 0.002 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook west of Lot 7396 and timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 7.1 Electrical Conductivity (µS/cm) - - - - 470 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) 0.002 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook upstream of Vasse Highway Substance (Unit of measurement) Nov 1990 Dec 1990 Jun 1991 Aug 1991 Jul 1992 Jul 1995 May 1996 Arsenic (mg/L) 0.15 0.034 0.11 0.206 0.05 0.03 <0.02 Chromium (mg/L) <0.1 <0.1 <0.01 <0.05 <0.01 <0.01 <0.02 Copper (mg/L) <0.01 <0.01 - - - 0.26 <0.02 Pentachlorophenol (µg/L) <0.1 9.7 <0.1 - - - - Total Petroleum Hydrocarbon (µg/L) <10 - - - - - - Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.002 - - Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) 0.002 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
The results below are arranged by sampling location from upstream to downstream. In the tables, mg/L is milligrams per litre, µg/L is micrograms per litre, and µS/cm is microSiemens per centimetre. Results preceded by ‘<’ were below the analytical laboratory’s limit of reporting and ‘-’ indicates a substance was not tested. Lefroy Brook upstream of Pump Hill Road Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.003 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 0.01 Copper (mg/L) 0.02 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) 60 - - - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Feb 1993 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.049 <0.001 <0.05 <0.02 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - - - Lefroy Brook west of Department of Primary Industries and Regional Development aquaculture facility, upstream of timber mill Substance (Unit of measurement) Dec 2020 Mar 2021 Arsenic (mg/L) <0.001 <0.001 Chromium (mg/L) <0.001 <0.001 Chromium (Hexavalent) (mg/L) <0.005 <0.005 Pentachlorophenol (µg/L) <2 <5 Lefroy Brook near northern boundary of Lot 7396, upstream of timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 5.8 Electrical Conductivity (µS/cm) - - - - 88 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) <0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 0.002 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook west of Lot 7396 and timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 7.1 Electrical Conductivity (µS/cm) - - - - 470 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) 0.002 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook upstream of Vasse Highway Substance (Unit of measurement) Nov 1990 Dec 1990 Jun 1991 Aug 1991 Jul 1992 Jul 1995 May 1996 Arsenic (mg/L) 0.15 0.034 0.11 0.206 0.05 0.03 <0.02 Chromium (mg/L) <0.1 <0.1 <0.01 <0.05 <0.01 <0.01 <0.02 Copper (mg/L) <0.01 <0.01 - - - 0.26 <0.02 Pentachlorophenol (µg/L) <0.1 9.7 <0.1 - - - - Total Petroleum Hydrocarbon (µg/L) <10 - - - - - - Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.002 - - Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) 0.002 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
Lefroy Brook upstream of Pump Hill Road Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.003 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 0.01 Copper (mg/L) 0.02 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) 60 - - - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Feb 1993 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.049 <0.001 <0.05 <0.02 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - - - Lefroy Brook west of Department of Primary Industries and Regional Development aquaculture facility, upstream of timber mill Substance (Unit of measurement) Dec 2020 Mar 2021 Arsenic (mg/L) <0.001 <0.001 Chromium (mg/L) <0.001 <0.001 Chromium (Hexavalent) (mg/L) <0.005 <0.005 Pentachlorophenol (µg/L) <2 <5 Lefroy Brook near northern boundary of Lot 7396, upstream of timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 5.8 Electrical Conductivity (µS/cm) - - - - 88 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) <0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 0.002 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook west of Lot 7396 and timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 7.1 Electrical Conductivity (µS/cm) - - - - 470 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) 0.002 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook upstream of Vasse Highway Substance (Unit of measurement) Nov 1990 Dec 1990 Jun 1991 Aug 1991 Jul 1992 Jul 1995 May 1996 Arsenic (mg/L) 0.15 0.034 0.11 0.206 0.05 0.03 <0.02 Chromium (mg/L) <0.1 <0.1 <0.01 <0.05 <0.01 <0.01 <0.02 Copper (mg/L) <0.01 <0.01 - - - 0.26 <0.02 Pentachlorophenol (µg/L) <0.1 9.7 <0.1 - - - - Total Petroleum Hydrocarbon (µg/L) <10 - - - - - - Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.002 - - Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) 0.002 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.003 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 0.01 Copper (mg/L) 0.02 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) 60 - - - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Feb 1993 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.049 <0.001 <0.05 <0.02 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - - - Lefroy Brook west of Department of Primary Industries and Regional Development aquaculture facility, upstream of timber mill Substance (Unit of measurement) Dec 2020 Mar 2021 Arsenic (mg/L) <0.001 <0.001 Chromium (mg/L) <0.001 <0.001 Chromium (Hexavalent) (mg/L) <0.005 <0.005 Pentachlorophenol (µg/L) <2 <5 Lefroy Brook near northern boundary of Lot 7396, upstream of timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 5.8 Electrical Conductivity (µS/cm) - - - - 88 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) <0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 0.002 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook west of Lot 7396 and timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 7.1 Electrical Conductivity (µS/cm) - - - - 470 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) 0.002 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook upstream of Vasse Highway Substance (Unit of measurement) Nov 1990 Dec 1990 Jun 1991 Aug 1991 Jul 1992 Jul 1995 May 1996 Arsenic (mg/L) 0.15 0.034 0.11 0.206 0.05 0.03 <0.02 Chromium (mg/L) <0.1 <0.1 <0.01 <0.05 <0.01 <0.01 <0.02 Copper (mg/L) <0.01 <0.01 - - - 0.26 <0.02 Pentachlorophenol (µg/L) <0.1 9.7 <0.1 - - - - Total Petroleum Hydrocarbon (µg/L) <10 - - - - - - Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.002 - - Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) 0.002 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
(Unit of measurement)
Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Feb 1993 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.049 <0.001 <0.05 <0.02 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - - - Lefroy Brook west of Department of Primary Industries and Regional Development aquaculture facility, upstream of timber mill Substance (Unit of measurement) Dec 2020 Mar 2021 Arsenic (mg/L) <0.001 <0.001 Chromium (mg/L) <0.001 <0.001 Chromium (Hexavalent) (mg/L) <0.005 <0.005 Pentachlorophenol (µg/L) <2 <5 Lefroy Brook near northern boundary of Lot 7396, upstream of timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 5.8 Electrical Conductivity (µS/cm) - - - - 88 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) <0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 0.002 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook west of Lot 7396 and timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 7.1 Electrical Conductivity (µS/cm) - - - - 470 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) 0.002 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook upstream of Vasse Highway Substance (Unit of measurement) Nov 1990 Dec 1990 Jun 1991 Aug 1991 Jul 1992 Jul 1995 May 1996 Arsenic (mg/L) 0.15 0.034 0.11 0.206 0.05 0.03 <0.02 Chromium (mg/L) <0.1 <0.1 <0.01 <0.05 <0.01 <0.01 <0.02 Copper (mg/L) <0.01 <0.01 - - - 0.26 <0.02 Pentachlorophenol (µg/L) <0.1 9.7 <0.1 - - - - Total Petroleum Hydrocarbon (µg/L) <10 - - - - - - Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.002 - - Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) 0.002 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
(Unit of measurement)
Lefroy Brook west of Department of Primary Industries and Regional Development aquaculture facility, upstream of timber mill Substance (Unit of measurement) Dec 2020 Mar 2021 Arsenic (mg/L) <0.001 <0.001 Chromium (mg/L) <0.001 <0.001 Chromium (Hexavalent) (mg/L) <0.005 <0.005 Pentachlorophenol (µg/L) <2 <5 Lefroy Brook near northern boundary of Lot 7396, upstream of timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 5.8 Electrical Conductivity (µS/cm) - - - - 88 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) <0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 0.002 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook west of Lot 7396 and timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 7.1 Electrical Conductivity (µS/cm) - - - - 470 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) 0.002 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook upstream of Vasse Highway Substance (Unit of measurement) Nov 1990 Dec 1990 Jun 1991 Aug 1991 Jul 1992 Jul 1995 May 1996 Arsenic (mg/L) 0.15 0.034 0.11 0.206 0.05 0.03 <0.02 Chromium (mg/L) <0.1 <0.1 <0.01 <0.05 <0.01 <0.01 <0.02 Copper (mg/L) <0.01 <0.01 - - - 0.26 <0.02 Pentachlorophenol (µg/L) <0.1 9.7 <0.1 - - - - Total Petroleum Hydrocarbon (µg/L) <10 - - - - - - Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.002 - - Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) 0.002 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
Substance (Unit of measurement) Dec 2020 Mar 2021 Arsenic (mg/L) <0.001 <0.001 Chromium (mg/L) <0.001 <0.001 Chromium (Hexavalent) (mg/L) <0.005 <0.005 Pentachlorophenol (µg/L) <2 <5 Lefroy Brook near northern boundary of Lot 7396, upstream of timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 5.8 Electrical Conductivity (µS/cm) - - - - 88 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) <0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 0.002 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook west of Lot 7396 and timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 7.1 Electrical Conductivity (µS/cm) - - - - 470 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) 0.002 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook upstream of Vasse Highway Substance (Unit of measurement) Nov 1990 Dec 1990 Jun 1991 Aug 1991 Jul 1992 Jul 1995 May 1996 Arsenic (mg/L) 0.15 0.034 0.11 0.206 0.05 0.03 <0.02 Chromium (mg/L) <0.1 <0.1 <0.01 <0.05 <0.01 <0.01 <0.02 Copper (mg/L) <0.01 <0.01 - - - 0.26 <0.02 Pentachlorophenol (µg/L) <0.1 9.7 <0.1 - - - - Total Petroleum Hydrocarbon (µg/L) <10 - - - - - - Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.002 - - Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) 0.002 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
(Unit of measurement)
Lefroy Brook near northern boundary of Lot 7396, upstream of timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 5.8 Electrical Conductivity (µS/cm) - - - - 88 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) <0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 0.002 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook west of Lot 7396 and timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 7.1 Electrical Conductivity (µS/cm) - - - - 470 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) 0.002 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook upstream of Vasse Highway Substance (Unit of measurement) Nov 1990 Dec 1990 Jun 1991 Aug 1991 Jul 1992 Jul 1995 May 1996 Arsenic (mg/L) 0.15 0.034 0.11 0.206 0.05 0.03 <0.02 Chromium (mg/L) <0.1 <0.1 <0.01 <0.05 <0.01 <0.01 <0.02 Copper (mg/L) <0.01 <0.01 - - - 0.26 <0.02 Pentachlorophenol (µg/L) <0.1 9.7 <0.1 - - - - Total Petroleum Hydrocarbon (µg/L) <10 - - - - - - Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.002 - - Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) 0.002 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 5.8 Electrical Conductivity (µS/cm) - - - - 88 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) <0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 0.002 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook west of Lot 7396 and timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 7.1 Electrical Conductivity (µS/cm) - - - - 470 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) 0.002 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook upstream of Vasse Highway Substance (Unit of measurement) Nov 1990 Dec 1990 Jun 1991 Aug 1991 Jul 1992 Jul 1995 May 1996 Arsenic (mg/L) 0.15 0.034 0.11 0.206 0.05 0.03 <0.02 Chromium (mg/L) <0.1 <0.1 <0.01 <0.05 <0.01 <0.01 <0.02 Copper (mg/L) <0.01 <0.01 - - - 0.26 <0.02 Pentachlorophenol (µg/L) <0.1 9.7 <0.1 - - - - Total Petroleum Hydrocarbon (µg/L) <10 - - - - - - Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.002 - - Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) 0.002 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
(Unit of measurement)
Lefroy Brook west of Lot 7396 and timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 7.1 Electrical Conductivity (µS/cm) - - - - 470 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) 0.002 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook upstream of Vasse Highway Substance (Unit of measurement) Nov 1990 Dec 1990 Jun 1991 Aug 1991 Jul 1992 Jul 1995 May 1996 Arsenic (mg/L) 0.15 0.034 0.11 0.206 0.05 0.03 <0.02 Chromium (mg/L) <0.1 <0.1 <0.01 <0.05 <0.01 <0.01 <0.02 Copper (mg/L) <0.01 <0.01 - - - 0.26 <0.02 Pentachlorophenol (µg/L) <0.1 9.7 <0.1 - - - - Total Petroleum Hydrocarbon (µg/L) <10 - - - - - - Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.002 - - Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) 0.002 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 7.1 Electrical Conductivity (µS/cm) - - - - 470 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) 0.002 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook upstream of Vasse Highway Substance (Unit of measurement) Nov 1990 Dec 1990 Jun 1991 Aug 1991 Jul 1992 Jul 1995 May 1996 Arsenic (mg/L) 0.15 0.034 0.11 0.206 0.05 0.03 <0.02 Chromium (mg/L) <0.1 <0.1 <0.01 <0.05 <0.01 <0.01 <0.02 Copper (mg/L) <0.01 <0.01 - - - 0.26 <0.02 Pentachlorophenol (µg/L) <0.1 9.7 <0.1 - - - - Total Petroleum Hydrocarbon (µg/L) <10 - - - - - - Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.002 - - Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) 0.002 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
(Unit of measurement)
Lefroy Brook upstream of Vasse Highway Substance (Unit of measurement) Nov 1990 Dec 1990 Jun 1991 Aug 1991 Jul 1992 Jul 1995 May 1996 Arsenic (mg/L) 0.15 0.034 0.11 0.206 0.05 0.03 <0.02 Chromium (mg/L) <0.1 <0.1 <0.01 <0.05 <0.01 <0.01 <0.02 Copper (mg/L) <0.01 <0.01 - - - 0.26 <0.02 Pentachlorophenol (µg/L) <0.1 9.7 <0.1 - - - - Total Petroleum Hydrocarbon (µg/L) <10 - - - - - - Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.002 - - Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) 0.002 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
Substance (Unit of measurement) Nov 1990 Dec 1990 Jun 1991 Aug 1991 Jul 1992 Jul 1995 May 1996 Arsenic (mg/L) 0.15 0.034 0.11 0.206 0.05 0.03 <0.02 Chromium (mg/L) <0.1 <0.1 <0.01 <0.05 <0.01 <0.01 <0.02 Copper (mg/L) <0.01 <0.01 - - - 0.26 <0.02 Pentachlorophenol (µg/L) <0.1 9.7 <0.1 - - - - Total Petroleum Hydrocarbon (µg/L) <10 - - - - - - Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.002 - - Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) 0.002 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
(Unit of measurement)
Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.002 - - Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) 0.002 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
(Unit of measurement)
Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
(Unit of measurement)
Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
(Unit of measurement)
Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
(Unit of measurement)
Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
(Unit of measurement)
(c)-(d) Testing of surface water in Lefroy Brook near the Pemberton Timber Mill site has been undertaken at various times, and for various substances, between late 1990 and March 2021. The results in tables below are from reports on contamination investigations of the Pemberton Mill site and associated former waste disposal areas held on the Department of Water and Environmental Regulation’s records. The results below are arranged by sampling location from upstream to downstream. In the tables, mg/L is milligrams per litre, µg/L is micrograms per litre, and µS/cm is microSiemens per centimetre. Results preceded by ‘<’ were below the analytical laboratory’s limit of reporting and ‘-’ indicates a substance was not tested. Lefroy Brook upstream of Pump Hill Road Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.003 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 0.01 Copper (mg/L) 0.02 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) 60 - - - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Feb 1993 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.049 <0.001 <0.05 <0.02 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - - - Lefroy Brook west of Department of Primary Industries and Regional Development aquaculture facility, upstream of timber mill Substance (Unit of measurement) Dec 2020 Mar 2021 Arsenic (mg/L) <0.001 <0.001 Chromium (mg/L) <0.001 <0.001 Chromium (Hexavalent) (mg/L) <0.005 <0.005 Pentachlorophenol (µg/L) <2 <5 Lefroy Brook near northern boundary of Lot 7396, upstream of timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 5.8 Electrical Conductivity (µS/cm) - - - - 88 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) <0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 0.002 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook west of Lot 7396 and timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 7.1 Electrical Conductivity (µS/cm) - - - - 470 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) 0.002 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook upstream of Vasse Highway Substance (Unit of measurement) Nov 1990 Dec 1990 Jun 1991 Aug 1991 Jul 1992 Jul 1995 May 1996 Arsenic (mg/L) 0.15 0.034 0.11 0.206 0.05 0.03 <0.02 Chromium (mg/L) <0.1 <0.1 <0.01 <0.05 <0.01 <0.01 <0.02 Copper (mg/L) <0.01 <0.01 - - - 0.26 <0.02 Pentachlorophenol (µg/L) <0.1 9.7 <0.1 - - - - Total Petroleum Hydrocarbon (µg/L) <10 - - - - - - Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.002 - - Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) 0.002 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
The results below are arranged by sampling location from upstream to downstream. In the tables, mg/L is milligrams per litre, µg/L is micrograms per litre, and µS/cm is microSiemens per centimetre. Results preceded by ‘<’ were below the analytical laboratory’s limit of reporting and ‘-’ indicates a substance was not tested. Lefroy Brook upstream of Pump Hill Road Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.003 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 0.01 Copper (mg/L) 0.02 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) 60 - - - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Feb 1993 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.049 <0.001 <0.05 <0.02 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - - - Lefroy Brook west of Department of Primary Industries and Regional Development aquaculture facility, upstream of timber mill Substance (Unit of measurement) Dec 2020 Mar 2021 Arsenic (mg/L) <0.001 <0.001 Chromium (mg/L) <0.001 <0.001 Chromium (Hexavalent) (mg/L) <0.005 <0.005 Pentachlorophenol (µg/L) <2 <5 Lefroy Brook near northern boundary of Lot 7396, upstream of timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 5.8 Electrical Conductivity (µS/cm) - - - - 88 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) <0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 0.002 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook west of Lot 7396 and timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 7.1 Electrical Conductivity (µS/cm) - - - - 470 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) 0.002 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook upstream of Vasse Highway Substance (Unit of measurement) Nov 1990 Dec 1990 Jun 1991 Aug 1991 Jul 1992 Jul 1995 May 1996 Arsenic (mg/L) 0.15 0.034 0.11 0.206 0.05 0.03 <0.02 Chromium (mg/L) <0.1 <0.1 <0.01 <0.05 <0.01 <0.01 <0.02 Copper (mg/L) <0.01 <0.01 - - - 0.26 <0.02 Pentachlorophenol (µg/L) <0.1 9.7 <0.1 - - - - Total Petroleum Hydrocarbon (µg/L) <10 - - - - - - Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.002 - - Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) 0.002 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
Lefroy Brook upstream of Pump Hill Road Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.003 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 0.01 Copper (mg/L) 0.02 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) 60 - - - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Feb 1993 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.049 <0.001 <0.05 <0.02 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - - - Lefroy Brook west of Department of Primary Industries and Regional Development aquaculture facility, upstream of timber mill Substance (Unit of measurement) Dec 2020 Mar 2021 Arsenic (mg/L) <0.001 <0.001 Chromium (mg/L) <0.001 <0.001 Chromium (Hexavalent) (mg/L) <0.005 <0.005 Pentachlorophenol (µg/L) <2 <5 Lefroy Brook near northern boundary of Lot 7396, upstream of timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 5.8 Electrical Conductivity (µS/cm) - - - - 88 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) <0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 0.002 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook west of Lot 7396 and timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 7.1 Electrical Conductivity (µS/cm) - - - - 470 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) 0.002 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook upstream of Vasse Highway Substance (Unit of measurement) Nov 1990 Dec 1990 Jun 1991 Aug 1991 Jul 1992 Jul 1995 May 1996 Arsenic (mg/L) 0.15 0.034 0.11 0.206 0.05 0.03 <0.02 Chromium (mg/L) <0.1 <0.1 <0.01 <0.05 <0.01 <0.01 <0.02 Copper (mg/L) <0.01 <0.01 - - - 0.26 <0.02 Pentachlorophenol (µg/L) <0.1 9.7 <0.1 - - - - Total Petroleum Hydrocarbon (µg/L) <10 - - - - - - Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.002 - - Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) 0.002 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.003 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 0.01 Copper (mg/L) 0.02 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) 60 - - - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Feb 1993 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.049 <0.001 <0.05 <0.02 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - - - Lefroy Brook west of Department of Primary Industries and Regional Development aquaculture facility, upstream of timber mill Substance (Unit of measurement) Dec 2020 Mar 2021 Arsenic (mg/L) <0.001 <0.001 Chromium (mg/L) <0.001 <0.001 Chromium (Hexavalent) (mg/L) <0.005 <0.005 Pentachlorophenol (µg/L) <2 <5 Lefroy Brook near northern boundary of Lot 7396, upstream of timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 5.8 Electrical Conductivity (µS/cm) - - - - 88 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) <0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 0.002 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook west of Lot 7396 and timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 7.1 Electrical Conductivity (µS/cm) - - - - 470 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) 0.002 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook upstream of Vasse Highway Substance (Unit of measurement) Nov 1990 Dec 1990 Jun 1991 Aug 1991 Jul 1992 Jul 1995 May 1996 Arsenic (mg/L) 0.15 0.034 0.11 0.206 0.05 0.03 <0.02 Chromium (mg/L) <0.1 <0.1 <0.01 <0.05 <0.01 <0.01 <0.02 Copper (mg/L) <0.01 <0.01 - - - 0.26 <0.02 Pentachlorophenol (µg/L) <0.1 9.7 <0.1 - - - - Total Petroleum Hydrocarbon (µg/L) <10 - - - - - - Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.002 - - Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) 0.002 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
(Unit of measurement)
Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Feb 1993 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.049 <0.001 <0.05 <0.02 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - - - Lefroy Brook west of Department of Primary Industries and Regional Development aquaculture facility, upstream of timber mill Substance (Unit of measurement) Dec 2020 Mar 2021 Arsenic (mg/L) <0.001 <0.001 Chromium (mg/L) <0.001 <0.001 Chromium (Hexavalent) (mg/L) <0.005 <0.005 Pentachlorophenol (µg/L) <2 <5 Lefroy Brook near northern boundary of Lot 7396, upstream of timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 5.8 Electrical Conductivity (µS/cm) - - - - 88 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) <0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 0.002 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook west of Lot 7396 and timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 7.1 Electrical Conductivity (µS/cm) - - - - 470 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) 0.002 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook upstream of Vasse Highway Substance (Unit of measurement) Nov 1990 Dec 1990 Jun 1991 Aug 1991 Jul 1992 Jul 1995 May 1996 Arsenic (mg/L) 0.15 0.034 0.11 0.206 0.05 0.03 <0.02 Chromium (mg/L) <0.1 <0.1 <0.01 <0.05 <0.01 <0.01 <0.02 Copper (mg/L) <0.01 <0.01 - - - 0.26 <0.02 Pentachlorophenol (µg/L) <0.1 9.7 <0.1 - - - - Total Petroleum Hydrocarbon (µg/L) <10 - - - - - - Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.002 - - Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) 0.002 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
(Unit of measurement)
Lefroy Brook west of Department of Primary Industries and Regional Development aquaculture facility, upstream of timber mill Substance (Unit of measurement) Dec 2020 Mar 2021 Arsenic (mg/L) <0.001 <0.001 Chromium (mg/L) <0.001 <0.001 Chromium (Hexavalent) (mg/L) <0.005 <0.005 Pentachlorophenol (µg/L) <2 <5 Lefroy Brook near northern boundary of Lot 7396, upstream of timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 5.8 Electrical Conductivity (µS/cm) - - - - 88 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) <0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 0.002 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook west of Lot 7396 and timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 7.1 Electrical Conductivity (µS/cm) - - - - 470 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) 0.002 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook upstream of Vasse Highway Substance (Unit of measurement) Nov 1990 Dec 1990 Jun 1991 Aug 1991 Jul 1992 Jul 1995 May 1996 Arsenic (mg/L) 0.15 0.034 0.11 0.206 0.05 0.03 <0.02 Chromium (mg/L) <0.1 <0.1 <0.01 <0.05 <0.01 <0.01 <0.02 Copper (mg/L) <0.01 <0.01 - - - 0.26 <0.02 Pentachlorophenol (µg/L) <0.1 9.7 <0.1 - - - - Total Petroleum Hydrocarbon (µg/L) <10 - - - - - - Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.002 - - Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) 0.002 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
Substance (Unit of measurement) Dec 2020 Mar 2021 Arsenic (mg/L) <0.001 <0.001 Chromium (mg/L) <0.001 <0.001 Chromium (Hexavalent) (mg/L) <0.005 <0.005 Pentachlorophenol (µg/L) <2 <5 Lefroy Brook near northern boundary of Lot 7396, upstream of timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 5.8 Electrical Conductivity (µS/cm) - - - - 88 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) <0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 0.002 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook west of Lot 7396 and timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 7.1 Electrical Conductivity (µS/cm) - - - - 470 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) 0.002 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook upstream of Vasse Highway Substance (Unit of measurement) Nov 1990 Dec 1990 Jun 1991 Aug 1991 Jul 1992 Jul 1995 May 1996 Arsenic (mg/L) 0.15 0.034 0.11 0.206 0.05 0.03 <0.02 Chromium (mg/L) <0.1 <0.1 <0.01 <0.05 <0.01 <0.01 <0.02 Copper (mg/L) <0.01 <0.01 - - - 0.26 <0.02 Pentachlorophenol (µg/L) <0.1 9.7 <0.1 - - - - Total Petroleum Hydrocarbon (µg/L) <10 - - - - - - Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.002 - - Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) 0.002 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
(Unit of measurement)
Lefroy Brook near northern boundary of Lot 7396, upstream of timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 5.8 Electrical Conductivity (µS/cm) - - - - 88 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) <0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 0.002 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook west of Lot 7396 and timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 7.1 Electrical Conductivity (µS/cm) - - - - 470 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) 0.002 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook upstream of Vasse Highway Substance (Unit of measurement) Nov 1990 Dec 1990 Jun 1991 Aug 1991 Jul 1992 Jul 1995 May 1996 Arsenic (mg/L) 0.15 0.034 0.11 0.206 0.05 0.03 <0.02 Chromium (mg/L) <0.1 <0.1 <0.01 <0.05 <0.01 <0.01 <0.02 Copper (mg/L) <0.01 <0.01 - - - 0.26 <0.02 Pentachlorophenol (µg/L) <0.1 9.7 <0.1 - - - - Total Petroleum Hydrocarbon (µg/L) <10 - - - - - - Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.002 - - Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) 0.002 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 5.8 Electrical Conductivity (µS/cm) - - - - 88 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) <0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 0.002 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook west of Lot 7396 and timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 7.1 Electrical Conductivity (µS/cm) - - - - 470 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) 0.002 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook upstream of Vasse Highway Substance (Unit of measurement) Nov 1990 Dec 1990 Jun 1991 Aug 1991 Jul 1992 Jul 1995 May 1996 Arsenic (mg/L) 0.15 0.034 0.11 0.206 0.05 0.03 <0.02 Chromium (mg/L) <0.1 <0.1 <0.01 <0.05 <0.01 <0.01 <0.02 Copper (mg/L) <0.01 <0.01 - - - 0.26 <0.02 Pentachlorophenol (µg/L) <0.1 9.7 <0.1 - - - - Total Petroleum Hydrocarbon (µg/L) <10 - - - - - - Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.002 - - Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) 0.002 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
(Unit of measurement)
Lefroy Brook west of Lot 7396 and timber mill Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 7.1 Electrical Conductivity (µS/cm) - - - - 470 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) 0.002 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook upstream of Vasse Highway Substance (Unit of measurement) Nov 1990 Dec 1990 Jun 1991 Aug 1991 Jul 1992 Jul 1995 May 1996 Arsenic (mg/L) 0.15 0.034 0.11 0.206 0.05 0.03 <0.02 Chromium (mg/L) <0.1 <0.1 <0.01 <0.05 <0.01 <0.01 <0.02 Copper (mg/L) <0.01 <0.01 - - - 0.26 <0.02 Pentachlorophenol (µg/L) <0.1 9.7 <0.1 - - - - Total Petroleum Hydrocarbon (µg/L) <10 - - - - - - Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.002 - - Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) 0.002 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 pH (pH units) - - - - 7.1 Electrical Conductivity (µS/cm) - - - - 470 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) <0.001 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) 0.002 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook upstream of Vasse Highway Substance (Unit of measurement) Nov 1990 Dec 1990 Jun 1991 Aug 1991 Jul 1992 Jul 1995 May 1996 Arsenic (mg/L) 0.15 0.034 0.11 0.206 0.05 0.03 <0.02 Chromium (mg/L) <0.1 <0.1 <0.01 <0.05 <0.01 <0.01 <0.02 Copper (mg/L) <0.01 <0.01 - - - 0.26 <0.02 Pentachlorophenol (µg/L) <0.1 9.7 <0.1 - - - - Total Petroleum Hydrocarbon (µg/L) <10 - - - - - - Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.002 - - Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) 0.002 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
(Unit of measurement)
Lefroy Brook upstream of Vasse Highway Substance (Unit of measurement) Nov 1990 Dec 1990 Jun 1991 Aug 1991 Jul 1992 Jul 1995 May 1996 Arsenic (mg/L) 0.15 0.034 0.11 0.206 0.05 0.03 <0.02 Chromium (mg/L) <0.1 <0.1 <0.01 <0.05 <0.01 <0.01 <0.02 Copper (mg/L) <0.01 <0.01 - - - 0.26 <0.02 Pentachlorophenol (µg/L) <0.1 9.7 <0.1 - - - - Total Petroleum Hydrocarbon (µg/L) <10 - - - - - - Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.002 - - Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) 0.002 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
Substance (Unit of measurement) Nov 1990 Dec 1990 Jun 1991 Aug 1991 Jul 1992 Jul 1995 May 1996 Arsenic (mg/L) 0.15 0.034 0.11 0.206 0.05 0.03 <0.02 Chromium (mg/L) <0.1 <0.1 <0.01 <0.05 <0.01 <0.01 <0.02 Copper (mg/L) <0.01 <0.01 - - - 0.26 <0.02 Pentachlorophenol (µg/L) <0.1 9.7 <0.1 - - - - Total Petroleum Hydrocarbon (µg/L) <10 - - - - - - Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.002 - - Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) 0.002 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
(Unit of measurement)
Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.002 - - Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) 0.002 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
(Unit of measurement)
Lefroy Brook at Vasse Highway bridge Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 pH (pH units) - - 7.2 Electrical Conductivity (µS/cm) - - 480 Pentachlorophenol (µg/L) - <2 <5 Total Metals Arsenic (mg/L) <0.001 - - Cadmium (mg/L) <0.0001 - - Chromium (mg/L) 0.001 - - Copper (mg/L) 0.002 - - Lead (mg/L) <0.001 - - Nickel (mg/L) 0.005 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - Lead (mg/L) <0.001 - - Nickel (mg/L) <0.001 - - Zinc (mg/L) <0.005 - - Mercury (mg/L) <0.0001 - - Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
(Unit of measurement)
Lefroy Brook downstream of Vasse Highway Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
Substance (Unit of measurement) Jun 2016 Dec 2020 Mar 2021 Location 1 Location 2 Location 1 Location 2 Pentachlorophenol (µg/L) - <2 <2 <5 <5 Total Metals Arsenic (mg/L) 0.002 - - - - Cadmium (mg/L) <0.0001 - - - - Chromium (mg/L) 0.001 - - - - Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) 0.001 - - - - Zinc (mg/L) 0.009 - - - - Mercury (mg/L) <0.0001 - - - - Dissolved Metals Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Cadmium (mg/L) <0.0001 - - - - Chromium (Hexavalent) (mg/L) - <0.005 <0.005 <0.005 <0.005 Chromium (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 Copper (mg/L) <0.001 - - - - Lead (mg/L) <0.001 - - - - Nickel (mg/L) <0.001 - - - - Zinc (mg/L) <0.005 - - - - Mercury (mg/L) <0.0001 - - - - Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
(Unit of measurement)
Lefroy Brook downstream of Power Road bridge Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
Substance (Unit of measurement) Nov 1990 Dec 1990 Jan 1991 Feb 1991 Mar 1991 May 1991 Arsenic (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 0.006 Chromium (mg/L) <0.1 <0.1 - <0.05 <0.005 <0.01 Copper (mg/L) <0.01 <0.01 - - - - Pentachlorophenol (µg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 Total Petroleum Hydrocarbon (µg/L) <10 - - - Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
(Unit of measurement)
Substance (Unit of measurement) Jun 1991 Aug 1991 Jul 1992 Apr 1993 Jul 1995 May 1996 Arsenic (mg/L) 0.022 0.008 <0.05 <0.002 <0.01 <0.02 Chromium (mg/L) <0.01 <0.05 <0.01 <0.01 <0.01 <0.04 Copper (mg/L) - - - - <0.01 <0.02 Pentachlorophenol (µg/L) <0.1 - - - - -
(Unit of measurement)
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