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Robert McClellon August 24, 2000 Page 3 temperature limit were damaged, so we ordered and replaced them. Troubleshooting the blower proved to be more difficult however. Prior to the repair of the blower, there was a time when the flare was not running properly because the damaged blower would not operate for a significant length of time. The blower was finally repaired in June, prior to the Second Quarter Monitoring Event. Yet, for an unknown reason, the flare shut down on June 24, 2000. The flare was restarted approximately one hour before the testing began on Monday June 26, 2000. The testing showed only one probe with gas concentrations above the 5%Lower Explosive Limit. The County believes this is directly attributed to the flare being down for an extended period right before the monitoring event. Since then, there have been no problems with the gas collection and control system and we believe migration is under control. In the letter dated July 12, 2000, the Environmental Health Division requested a remediation plan addressing methane gas migration. After a request from the EHD, the County submitted a work plan to the EHD for the remediation of methane gas releases at the Harney Lane Sanitary Landfill. The County has implemented the measures in the plan as approved by the EHD. The County believes that this plan effectively controls landfill gas migration as long as both blowers remain operational. By keeping up with maintenance, the system should continue to control landfill gas migration. The County is requesting that a re-sampling event be set up with the Environmental Health Division to verify that we are in compliance. Please contact me to set up a time at your convenience. If you have any questions, please call me at (209)468-3066. MK:rh N:\Michacl\HL\Gas\remed_plan.vqA c: Gino Yekta, California Integrated Waste Management Board LA 11458