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Aug -29-2008 10:40 AM CA Integrated Waste Management 9163413884 5/6 Comments Continued: § 20921 - Gas Monitoring and Co'xtrol Methane gas levels in landfill gas migration monitoring probes PGP -1 and PGP -2 were found in excess of the regulatory limits of 5%. See Attachment 1, for the results of the methane gas monitoring that was conducted at the time of the inspection. Because the level of the .methane bas in the monitoring probes has exceeded the regulatory limit, the owner shall immediately take the steps required in 27 CCR Section 20937, to protect public health, safety, and the environr-nent. The owner has taken the following measures to Comply with the requirements, since the Enforcement Agency (1A) required a Corrective /action Plan and increased monitoring in March 2008: * Submitted a Corrective Action Plain in May 2008, with a preferred alternative for the installation of a passive control (venting) system with carbon Ater treatment; • On July 18, 2008, submitted time lines for the installation and implementation of the venting system; • On August 4, 2008, submitted Second Quarter/Serpi'-Annual 2008 Groundwater and Landfill Gas Sampling Event; and • On August 18, 2008, submitted a design plan for the proposed venting system, which currently isunder review by Board staff. The venting (or passive) sysiern is the owner/operator's preferred corrective action alternative provided in the Corrective Action flan, dated May 23, 2008_ The owner shall continue to submit to the BA, the results of all landfill gas monitoring reports, on a quarterly basis. Areas of Concerti: § 21142 - Final Grading § 211.50 - Drainage/Erosion Control The grading of the landfill and the provision of adequate drainage and the runoff are issues still being reviewed and commented an by the regulatory agencies in the context of the implementation of the Final Closure Plan and acceptance of the Closure Report Addendum. The areas of concern will rernain until the regulatory agencies accept the Closui e Report Addendum, wbieh was submitted as the Construction Quality Assurance Report (CQA Report) to meet the requirements of 27 CCR, Section 21880.