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California gional Water Quality Co of Board <br />Central Valley Region <br />Karl E. Longley, ScD, P.E., Chair <br />Linda S. Adams 11020 Sun Center Drive #200, Rancho Cordova, California 95670.6114 Arnold <br />Secretary for Phone (916) 464-3291 - FAX (916) 4644645 Schwarzenegger <br />Environmental http://www.waterboards.ca.gov/centralvalley Governor <br />Protection � G ! <br />�' <br />9 September 2008 SEP 1 7 2,008 <br />Andrew Keller, Environmental Manager <br />,ivi�r°'�''" <br />TLE Properties, Inc. <br />379 Costa Mesa Street <br />Costa Mesa, CA 92627 <br />CONTRACTORS LANDFILL, SAN JOAQUIN COUNTY <br />The Regional Water Quality Control Board (Regional Water Board) staff has reviewed the <br />"Second Quarter/Semi-Annual 2008 Groundwater, Surface Water, and Landfill Gas <br />Monitoring (Report) received on 1 August 2008 from Cove Contractors, Inc. (Discharger). <br />Currently, the Discharger is regulated under Waste Discharge Requirements Order No. <br />R5-2007-0084 (WDRs) for post -closure maintenance and monitoring of a landfill. In addition, <br />due to methane concentrations in excess of the regulatory threshold of five percent in <br />perimeter landfill gas monitoring probes, the Discharger is under corrective action to mitigate <br />the migration of landfill gas. The California Integrated Waste Management Board is <br />overseeing the corrective action for methane. <br />Based on staffs review, the Report was organized and presented clearly the technical data <br />and evaluations. However, staff notes that the transmittal letter did not include all the <br />information required by Section E.2 of the Monitoring and Reporting Program <br />No. R5-2007-0084. Information required to be included in the transmittal letter is listed below, <br />with examples of information to include. <br />1. If no violations occurred since the last report was submitted, the Discharger must state <br />that information in the transmittal letter. <br />2. The Discharger is required to identify any violations found since the last report was <br />submitted. For example, the Discharger must state that MW -3A had concentrations of <br />cis-1,2-DCE and naphthalene reported for the first time, and that newly installed <br />groundwater well MW -10A had concentrations of carbon disulfide. <br />3. The Discharger is required to explain the essential points of the monitoring report. For <br />example, the Discharger must state that groundwater well MW -7 has had <br />concentrations of chloroform in eight of the last eight sampling events, and that <br />methane and VOCs continue to be detected in perimeter landfill gas monitoring wells. <br />4. The Discharger is required to provide descriptions of the actions taken or planned for <br />correcting any violations. For example, the Discharger must state whether or not <br />MW -3A and MW -10A were re -sampled, and if actions are planned for correcting the <br />chloroform concentrations -in -groundwater well MW -7. In addition, the Discharger must <br />describe the actions taken, actions planned, and schedule for the control of methane in <br />landfill gas. <br />California Environmental Protection Agency <br />a,Recycled Paper <br />