73 7 If the Consent Holder can demonstrate that the quality of water entering the Main Collection Pond is of a quality such that on a continuous basis the effects of the discharge from this pond after mixing: a. Meets or is better than the receiving water criteria defined in Condition G33; b. Is capable of remaining so on a continuous basis; and, c In combination with all other discharges authorised for this site, shall not cause a significant adverse environmental effect on the receiving ground water and surface water, or on users of these resources, or, in the case of surface water, aquatic biota, then the Consent Holder may seek the approval of the Waikato Regional Council to discharge directly from the pond. If that approval is given: d. The Consent Holder shall continuously monitor pH and suspended solids in the pond; and e. For rainfall events less than or equal to the 2-year return period, the Consent Holder may direct discharges from the pond provided the continuous monitoring shows the water: i. has a suspended solids concentration of no greater than 100 g/m3; and ii. has a pH within the range of 6.0-9.0 pH units. 8 The Main Collection Pond shall be provided with a spillway that will safely route a 100 year return period flood. 9 The Consent Holder shall ensure that the Main Collection Pond is: a. Constructed from, or lined with, materials which provide for secure long term containment; and b. Constructed using materials which have no acid forming potential; and c. Lined with 1.5mm HDPE (or other similar synthetic liner approved by the Waikato Regional Council) to a height of 1.5m from the base, and with a 0.5m protective cover layer. 10 The Main Collection Pond design is to be submitted to the Waikato Regional Council for written certification prior to construction commencing. 11 The Main Collection Pond and associated works shall be designed and implemented under the supervision of persons with appropriate experience in the design and supervision of civil engineering construction works.
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