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f a r 3. Remove condensate blockage by re-establishing proper drainage across the low sots by one of two methods: a. Replace the header using PVC pipe installed above ground. b. Expose the length of pipe with the low spot and raise the pipe to the proper elevation, eliminating the low spot. 4. Aggressively increase the LFG collection from the wells in the vicinity of the monitoring wells indicating migration. a. Increase flow rate at the flare station by 20%(accomplished September 15, 2004). b. Three days later, adjust all LFG wells to maximize collection from the wells in the vicinity of monitoring wells GW-1, -2, and 3 (accomplished September 18, 2004). c. Two weeks after the well adjustment(above), readjust the LFG wells to again increase collection from the wells in the vicinity of monitoring wells GW-1, -2, and -3. Reduce collection from any well that shows significant overdraw (accomplished October 1, 2004, LFG collection rate increased from approximately 250 to over 360 cfin). d. Continue applying aggressive vacuum, and adjust wells to provide maximum collection near any monitoring well above regulatory limits. Reduce vacuum at wells at which excessive overdraw is indicated (ongoing). Additional Monitoring Monitor wells GW-1, -2, and-3, and the foundation vents of the structures adjacent to those wells on a weekly basis until the concentration of combustible gas at those wells is brought below regulatory limits. Take appropriate action if combustible gas is found at or above 1.25%in the foundation vents. Continue applying aggressive vacuum and adjust the LFG system monthly to maximize LFG collection from landfill adjacent to those wells. Monitor wells GW-1, -2, and-3 monthly for three months after concentration of combustible gas at wells GW-1, -2, and -3 is first brought below regulatory limits. Some variation in detections may be expected as the soil is purged of combustible gas. A short-term increase above regulatory limits is not considered an indication of renewed migration,but rather that some LFG has been trapped in the soil, and is being vented by natural pressure variations as well as the LFG collection system. Reporting The results of the additional monitoring will be included in the quarterly migration monitoring report for the Harney Lane Landfill. Additional reports may be made as appropriate. The County will notify the Local Enforcement Agency(LEA) and the Migrant Labor Housing facility immediately if combustible gas above 1.25% is detected in any foundation vent. NAI Harney Lane\LFG MonitData\2004\Remediation Plan.doc Remediation Plan for LFG Migration 3 San Joaquin County Public Works/Solid Waste Harney Lane Sanitary Landfill October 4,2004