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Mr. Kevin Basso - 2 - ® 10 October 2001 must be closed during the 2002 construction season. Please submit as an addendum to the JTD, with a time schedule, to bring Austin Road to a grade that will insure drainage(no less than 3% positive slope), and complete installation the Interim Final Cover no later than 1 October 2002. It may not be possible under permitted waste inflow rates to achieve the grading plan anticipated in the JTD. If this is the case, a revised fill/grading plan must be implemented so that the interim final cover is completed during the 2002 construction season. 4. As noted in the JTD, landfill gases are believed to be an important source of VOCs in groundwater at Austin Road landfill and a source of the intermittent detections of VOCs in groundwater at Forward. The JTD proposed to improve the existing gas extraction system at Austin Road and incorporate the Forward area into the improved system. These improvements are part of the corrective actions for clean up contaminated groundwater. A time schedule for improvements to the landfill gas monitoring and extraction system should be submitted as an addendum to the JTD. 5. Forward is concurrently working on a revised Engineering Feasibility Study for cleanup of the Austin Road groundwater contamination. Staff anticipates that the study will conclude with a plan consisting of improvements to the gas extraction system, artificial recharge of treated groundwater, and addition of one or more downgradient extraction wells. A time schedule for implementing the results of the EFS should be submitted as an addendum to the JTD. This time schedule may incorporate the schedule asked for in item 4 above. Please submit the*addendums, requested in items 1 through 5 above no later than 15 December 2001, so that tentative WDRs can be completed by mid-January 2002. If you have any questions, please call me at (916) 255-3814. ROSS D. ATKINSON Associate Engineering Geologist cc: Mr. Robert McClellan, San Joaquin County LEA, Stockton Mr. Geno Yekta, CIMWB, Sacramento. Mr. Butch Stafani, Forward Landfill Operations Manager, Stockton. Ms. Sangeeta Lewis, Lewis Engineering, Piedmont. Mr. Curt Fuji, Forward Inc.