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WASTE DISCHARGE REQUIREMENTS ORDER N0. R5-2003-0049 -12- FORWARD INC. AND ALLIED WASTE INDUSTRIES FOR OPERATION OF FORWARD CLASS II LANDFILL SAN JOAQUINCOUNTY 56. Construction will proceed only after all applicable construction quality assurance plans have been approved by Executive Officer. 57. The discharger proposed to construct two Class ll surface impoundments to contain and evaporate leachate fxom.solid waste management units, An engineered alternative to the prescriptive liner requiremonts of Title 27 is proposed for the Class U Surface Impoundments. The engineered alternative consists of from the top down: a. A primary 60-mi]-thick High Density Polyethylene (HDPE) geoniembrane b. A geonet drainage layer, as a Leachate Collection and Removal System (LCRS) c. A secondary 60-mil-thick FIJDPE geomembrane and d. A GCL in place of the compacted clay liner. 58. The surface impoundment will have a geonet LCRS blanket across the entire area of the pond. The LCRS stunp wil l be constructed of a gravel collection area and will have the capacity to store a minimum of twice the maximum anticipated daily volume of leachate. Liquids removed from the LCRS will be returned to the surface impoundment. The sump includes with a high level alarm, if liquids trigger thelevel alarm the sump will be pumped out. 59. The Discharger proposes a pan lysimeter tinder the LCRS sump as an unsaturated zone monitoring system per the requirements of Title 27 Section 20415(d). The pan lysimeters will include a sump area that is accessed with a pipe. Any liquids that are detected in the VZMS sump will be removed and returned to the surface impoundment. The sump will include a high-level alarm, if liquids trigger the level alarm the sump will be puratped out. 60. The existing landfill gas extraction systeni at Austin Road landfill consists of 30 vertical gas extraction wells, a horizontal gas collection trench, a gas collection pipe system with condensate collection, and a gas-to energy electrical power plant. The existing system did not capture all Iandfill gas generated by the landfill and the system is currentlyurndergoing expansion. The expansion consists of 74 vertical gas extraction wells, a gas collection system with condensate collection, and a flare station to incinerate the gas. 61. Old Forward landfill has a landfill gas extraction to capture gas from Waste Management Unit B. The system consists of 18 vertical gas extraction wells and a gas collection pipe system with condensate collection. Gas from Forward is piped to the Austin Road flare station. 62. The landfill gas extraction system will expand as needed. The discharger will monitor soil gas for VOCs and when they are detected the extraction system will expand to cover those areas, b l d O 12090£££9 'ON/99:£l U/00: ti l 90H 01 W (NON) WOai