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WASTE DISCHARGE REQUIREJvMNTS ORDER NO. R5-2003-0049 -8- FORWARD INC.AND ALLIED WASTE INDUSTRIES FOR OPERATION OF FORWARD CLASS II LANDFILL SAN JOAQUIN COUNTY failed to remediate the groundwater impacts. In June 2002 the Board adopted Order No. R5- 2002-0121 to implement revised corrective actions and remediate groundwater impacts. All outstanding corrective active provisions adopted in the previous order are continued in this order. 36. The old Forward Landfill has a history OC sporadic, low concentration detections of VOCs in groundwater sin.ee monitoring began in 1987. VOCs have most commonly been detected in the northeast comer of the old Forward Landfill site. The most frequently detected VOCs are: benzene, cis-l,2-dichloroetliene, tetraeblotoethene, toluene, 1,1-dichloroetliane, and 1,1,1-trichloroethane. An assessment of these detections submitted by the discharger found that the source is likely landfill gas released from waste management units. CORRECTIVE ACTION 37, At Austin Road Landfill.significant VOC impacts to groundwater downgradient of the facility were detected in 1989. By 1991 evaluation monitoring determined that chlorinated hydrocarbon impacts extended as far as 1,000 feet downgradient of the landfill. A corrective action,plan was approved for implementation in August 1991. The plan consists of a load checking program; extraction and treatment of impacted groundwater from two wells; and continued monitoring of the effectiveness of corrective action. 38. In 1998 corrective action monitoring determined that the initial corrective actions had failed to contain groundwater contamination or remediate groundwater impacts. In April 1999,the City of Stockton (previous discharger)subnuttcd a Draft Engineering Feasibility Study(EFS) for an unproved corrective action plan. Staff determined that the Draft EFS was inadequate and requested changes. On 3 September 2000, ownership of Austin Road landfill was transferred to Forward Inc. A revised EFS was submitted 11 June 2001 and then revised in response to comments on 30 August 2001; a Time Schedule for Corrective Action was submitted 13 December 2001; and an Evaluation Procedures for Proposed Corrective Action was submitted 26 February 2002. The resulting corrective action plan, includes the following activities: a. enhance landfi 11 gas control system to prevent further release of VOCs from the Landfill; b. continued groundwater extraction and treatment with existing extraction wells; c;. implementation.of a groundwater artificial recharge system using treated water; d. additional groundwater monitoring wells to monitor the effectiveness of the corrective action :.md determination of the need for modifications; and 0l d 0 1Z090££S9 'ON/99:£t 'iS/69:E l 90OZ 0 l l(lf (NOW) WOdd