❓ Hon Jim Scott questions the Transport Minister about the use of a sealant in a tunnel floor, focusing on its composition, quantity, potential for water contamination, and environmental assessment. The Minister provides details on the sealant's properties, usage, and testing, noting EPA assessment wasn't conducted but other water authorities approved it.
AnsweredQoN 357Legislative Council
QuestionView source ↗
(1) What silicone sealant will the contractor inject into the tunnel floor? (2) What quantity of sealant will be used? (3) Have studies been carried out as to the potential of this sealant to leach into the underground water? (4) If so, will the Minister name them and who carried them out? (5) Has this maintenance procedure been assessed by the EPA? (6) If not, why not? Answered on 18 October 2000 The Minister
AnswerView source ↗
Answered
18 October 2000
Response time
70 days
(1) The contractor has used a product called BBZ Duraseal Inject which belongs, chemically, to the group of hydrogels to repair cracks in the tunnel floor. The product is a solvent-free water-soluble injection resin, which swells when in contact with water. The material and its use has been accepted for the repair of cracks in contact with potable water. (2) The approximate quantity used in the August repairs is 75 litres. (3) The product once injected into the crack and coming into contact with water within the crack, takes on a hardened nature and is not expected to escape from beneath the underside of the floor slab. However, Duraseal Inject has been tested in Germany and certified for use in contact with potable water. (4) The supplier has provided a certificate from the Hygiene Institute in Gelsenkirchen, Germany which shows no adverse reaction of the product with potable water. (5)-(6) The maintenance procedure has not been assessed by the EPA. However the product has been approved for use by several water authorities in Australia. The contractor understands that historically, the use of the product has not raised any environmental issues.
(2) What quantity of sealant will be used? (3) Have studies been carried out as to the potential of this sealant to leach into the underground water? (4) If so, will the Minister name them and who carried them out? (5) Has this maintenance procedure been assessed by the EPA? (6) If not, why not? Answered on 18 October 2000 The Minister Replied: (1) The contractor has used a product called BBZ Duraseal Inject which belongs, chemically, to the group of hydrogels to repair cracks in the tunnel floor. The product is a solvent-free water-soluble injection resin, which swells when in contact with water. The material and its use has been accepted for the repair of cracks in contact with potable water. (2) The approximate quantity used in the August repairs is 75 litres. (3) The product once injected into the crack and coming into contact with water within the crack, takes on a hardened nature and is not expected to escape from beneath the underside of the floor slab. However, Duraseal Inject has been tested in Germany and certified for use in contact with potable water. (4) The supplier has provided a certificate from the Hygiene Institute in Gelsenkirchen, Germany which shows no adverse reaction of the product with potable water. (5)-(6) The maintenance procedure has not been assessed by the EPA. However the product has been approved for use by several water authorities in Australia. The contractor understands that historically, the use of the product has not raised any environmental issues.
(3) Have studies been carried out as to the potential of this sealant to leach into the underground water? (4) If so, will the Minister name them and who carried them out? (5) Has this maintenance procedure been assessed by the EPA? (6) If not, why not? Answered on 18 October 2000 The Minister Replied: (1) The contractor has used a product called BBZ Duraseal Inject which belongs, chemically, to the group of hydrogels to repair cracks in the tunnel floor. The product is a solvent-free water-soluble injection resin, which swells when in contact with water. The material and its use has been accepted for the repair of cracks in contact with potable water. (2) The approximate quantity used in the August repairs is 75 litres. (3) The product once injected into the crack and coming into contact with water within the crack, takes on a hardened nature and is not expected to escape from beneath the underside of the floor slab. However, Duraseal Inject has been tested in Germany and certified for use in contact with potable water. (4) The supplier has provided a certificate from the Hygiene Institute in Gelsenkirchen, Germany which shows no adverse reaction of the product with potable water. (5)-(6) The maintenance procedure has not been assessed by the EPA. However the product has been approved for use by several water authorities in Australia. The contractor understands that historically, the use of the product has not raised any environmental issues.
(4) If so, will the Minister name them and who carried them out? (5) Has this maintenance procedure been assessed by the EPA? (6) If not, why not? Answered on 18 October 2000 The Minister Replied: (1) The contractor has used a product called BBZ Duraseal Inject which belongs, chemically, to the group of hydrogels to repair cracks in the tunnel floor. The product is a solvent-free water-soluble injection resin, which swells when in contact with water. The material and its use has been accepted for the repair of cracks in contact with potable water. (2) The approximate quantity used in the August repairs is 75 litres. (3) The product once injected into the crack and coming into contact with water within the crack, takes on a hardened nature and is not expected to escape from beneath the underside of the floor slab. However, Duraseal Inject has been tested in Germany and certified for use in contact with potable water. (4) The supplier has provided a certificate from the Hygiene Institute in Gelsenkirchen, Germany which shows no adverse reaction of the product with potable water. (5)-(6) The maintenance procedure has not been assessed by the EPA. However the product has been approved for use by several water authorities in Australia. The contractor understands that historically, the use of the product has not raised any environmental issues.
(5) Has this maintenance procedure been assessed by the EPA? (6) If not, why not? Answered on 18 October 2000 The Minister Replied: (1) The contractor has used a product called BBZ Duraseal Inject which belongs, chemically, to the group of hydrogels to repair cracks in the tunnel floor. The product is a solvent-free water-soluble injection resin, which swells when in contact with water. The material and its use has been accepted for the repair of cracks in contact with potable water. (2) The approximate quantity used in the August repairs is 75 litres. (3) The product once injected into the crack and coming into contact with water within the crack, takes on a hardened nature and is not expected to escape from beneath the underside of the floor slab. However, Duraseal Inject has been tested in Germany and certified for use in contact with potable water. (4) The supplier has provided a certificate from the Hygiene Institute in Gelsenkirchen, Germany which shows no adverse reaction of the product with potable water. (5)-(6) The maintenance procedure has not been assessed by the EPA. However the product has been approved for use by several water authorities in Australia. The contractor understands that historically, the use of the product has not raised any environmental issues.
(6) If not, why not? Answered on 18 October 2000 The Minister Replied: (1) The contractor has used a product called BBZ Duraseal Inject which belongs, chemically, to the group of hydrogels to repair cracks in the tunnel floor. The product is a solvent-free water-soluble injection resin, which swells when in contact with water. The material and its use has been accepted for the repair of cracks in contact with potable water. (2) The approximate quantity used in the August repairs is 75 litres. (3) The product once injected into the crack and coming into contact with water within the crack, takes on a hardened nature and is not expected to escape from beneath the underside of the floor slab. However, Duraseal Inject has been tested in Germany and certified for use in contact with potable water. (4) The supplier has provided a certificate from the Hygiene Institute in Gelsenkirchen, Germany which shows no adverse reaction of the product with potable water. (5)-(6) The maintenance procedure has not been assessed by the EPA. However the product has been approved for use by several water authorities in Australia. The contractor understands that historically, the use of the product has not raised any environmental issues.
Answered on 18 October 2000 The Minister Replied: (1) The contractor has used a product called BBZ Duraseal Inject which belongs, chemically, to the group of hydrogels to repair cracks in the tunnel floor. The product is a solvent-free water-soluble injection resin, which swells when in contact with water. The material and its use has been accepted for the repair of cracks in contact with potable water. (2) The approximate quantity used in the August repairs is 75 litres. (3) The product once injected into the crack and coming into contact with water within the crack, takes on a hardened nature and is not expected to escape from beneath the underside of the floor slab. However, Duraseal Inject has been tested in Germany and certified for use in contact with potable water. (4) The supplier has provided a certificate from the Hygiene Institute in Gelsenkirchen, Germany which shows no adverse reaction of the product with potable water. (5)-(6) The maintenance procedure has not been assessed by the EPA. However the product has been approved for use by several water authorities in Australia. The contractor understands that historically, the use of the product has not raised any environmental issues.
(2) What quantity of sealant will be used? (3) Have studies been carried out as to the potential of this sealant to leach into the underground water? (4) If so, will the Minister name them and who carried them out? (5) Has this maintenance procedure been assessed by the EPA? (6) If not, why not? Answered on 18 October 2000 The Minister Replied: (1) The contractor has used a product called BBZ Duraseal Inject which belongs, chemically, to the group of hydrogels to repair cracks in the tunnel floor. The product is a solvent-free water-soluble injection resin, which swells when in contact with water. The material and its use has been accepted for the repair of cracks in contact with potable water. (2) The approximate quantity used in the August repairs is 75 litres. (3) The product once injected into the crack and coming into contact with water within the crack, takes on a hardened nature and is not expected to escape from beneath the underside of the floor slab. However, Duraseal Inject has been tested in Germany and certified for use in contact with potable water. (4) The supplier has provided a certificate from the Hygiene Institute in Gelsenkirchen, Germany which shows no adverse reaction of the product with potable water. (5)-(6) The maintenance procedure has not been assessed by the EPA. However the product has been approved for use by several water authorities in Australia. The contractor understands that historically, the use of the product has not raised any environmental issues.
(3) Have studies been carried out as to the potential of this sealant to leach into the underground water? (4) If so, will the Minister name them and who carried them out? (5) Has this maintenance procedure been assessed by the EPA? (6) If not, why not? Answered on 18 October 2000 The Minister Replied: (1) The contractor has used a product called BBZ Duraseal Inject which belongs, chemically, to the group of hydrogels to repair cracks in the tunnel floor. The product is a solvent-free water-soluble injection resin, which swells when in contact with water. The material and its use has been accepted for the repair of cracks in contact with potable water. (2) The approximate quantity used in the August repairs is 75 litres. (3) The product once injected into the crack and coming into contact with water within the crack, takes on a hardened nature and is not expected to escape from beneath the underside of the floor slab. However, Duraseal Inject has been tested in Germany and certified for use in contact with potable water. (4) The supplier has provided a certificate from the Hygiene Institute in Gelsenkirchen, Germany which shows no adverse reaction of the product with potable water. (5)-(6) The maintenance procedure has not been assessed by the EPA. However the product has been approved for use by several water authorities in Australia. The contractor understands that historically, the use of the product has not raised any environmental issues.
(4) If so, will the Minister name them and who carried them out? (5) Has this maintenance procedure been assessed by the EPA? (6) If not, why not? Answered on 18 October 2000 The Minister Replied: (1) The contractor has used a product called BBZ Duraseal Inject which belongs, chemically, to the group of hydrogels to repair cracks in the tunnel floor. The product is a solvent-free water-soluble injection resin, which swells when in contact with water. The material and its use has been accepted for the repair of cracks in contact with potable water. (2) The approximate quantity used in the August repairs is 75 litres. (3) The product once injected into the crack and coming into contact with water within the crack, takes on a hardened nature and is not expected to escape from beneath the underside of the floor slab. However, Duraseal Inject has been tested in Germany and certified for use in contact with potable water. (4) The supplier has provided a certificate from the Hygiene Institute in Gelsenkirchen, Germany which shows no adverse reaction of the product with potable water. (5)-(6) The maintenance procedure has not been assessed by the EPA. However the product has been approved for use by several water authorities in Australia. The contractor understands that historically, the use of the product has not raised any environmental issues.
(5) Has this maintenance procedure been assessed by the EPA? (6) If not, why not? Answered on 18 October 2000 The Minister Replied: (1) The contractor has used a product called BBZ Duraseal Inject which belongs, chemically, to the group of hydrogels to repair cracks in the tunnel floor. The product is a solvent-free water-soluble injection resin, which swells when in contact with water. The material and its use has been accepted for the repair of cracks in contact with potable water. (2) The approximate quantity used in the August repairs is 75 litres. (3) The product once injected into the crack and coming into contact with water within the crack, takes on a hardened nature and is not expected to escape from beneath the underside of the floor slab. However, Duraseal Inject has been tested in Germany and certified for use in contact with potable water. (4) The supplier has provided a certificate from the Hygiene Institute in Gelsenkirchen, Germany which shows no adverse reaction of the product with potable water. (5)-(6) The maintenance procedure has not been assessed by the EPA. However the product has been approved for use by several water authorities in Australia. The contractor understands that historically, the use of the product has not raised any environmental issues.
(6) If not, why not? Answered on 18 October 2000 The Minister Replied: (1) The contractor has used a product called BBZ Duraseal Inject which belongs, chemically, to the group of hydrogels to repair cracks in the tunnel floor. The product is a solvent-free water-soluble injection resin, which swells when in contact with water. The material and its use has been accepted for the repair of cracks in contact with potable water. (2) The approximate quantity used in the August repairs is 75 litres. (3) The product once injected into the crack and coming into contact with water within the crack, takes on a hardened nature and is not expected to escape from beneath the underside of the floor slab. However, Duraseal Inject has been tested in Germany and certified for use in contact with potable water. (4) The supplier has provided a certificate from the Hygiene Institute in Gelsenkirchen, Germany which shows no adverse reaction of the product with potable water. (5)-(6) The maintenance procedure has not been assessed by the EPA. However the product has been approved for use by several water authorities in Australia. The contractor understands that historically, the use of the product has not raised any environmental issues.
Answered on 18 October 2000 The Minister Replied: (1) The contractor has used a product called BBZ Duraseal Inject which belongs, chemically, to the group of hydrogels to repair cracks in the tunnel floor. The product is a solvent-free water-soluble injection resin, which swells when in contact with water. The material and its use has been accepted for the repair of cracks in contact with potable water. (2) The approximate quantity used in the August repairs is 75 litres. (3) The product once injected into the crack and coming into contact with water within the crack, takes on a hardened nature and is not expected to escape from beneath the underside of the floor slab. However, Duraseal Inject has been tested in Germany and certified for use in contact with potable water. (4) The supplier has provided a certificate from the Hygiene Institute in Gelsenkirchen, Germany which shows no adverse reaction of the product with potable water. (5)-(6) The maintenance procedure has not been assessed by the EPA. However the product has been approved for use by several water authorities in Australia. The contractor understands that historically, the use of the product has not raised any environmental issues.
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