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Californi egional Water Quality Co of Board Central Valley Region Karl E.Longley,ScD,P.E.,Chair Linda S.Adams 11020 Sun Center Drive#200,Rancho Cordova,California 95670.6114 Arnold Secretaryfor Phone(916)464-3291 •FAX(916)4644645 Schwarzenegger Environmental http://www.waterboards.ca.gov/centralvalley Governor Protection 11 May 2009 RECEIVED MAY I 12009 W. Michael Carroll San Joaquin County Department of Public Works Solid Waste Division P.O. Box 1810 Stockton, CA 95201 REQUEST FOR RESPONSE TO A RELEASE, HARNEY LANE SANITARY LANDFILL, SAN JOAQUIN COUNTY The Central Valley Regional Water Quality Control Board (Central Valley Water Board)staff has reviewed the 1st Quarter 2009 Groundwater and Surface Water Monitoring Report for the Harney Lane Sanitary Landfill. The report was prepared in accordance with Waste Discharge Requirements (WDRs) Order No. 96-139. The groundwater beneath the Harney Lane Landfill has been affected by landfill gas as reported by detections of volatile organic compounds (VOCs) in well MW-2 and now well MW-4. VOCs detected in well MW-4 have been confirmed through re-testing, indicating a "measurably significant" release to the environment. In accordance with Title 27, §20385 (a)(2), the Discharger shall institute an evaluation monitoring program (EMP) under §20425 whenever there is "measurably significant" evidence of a release from the Unit during a detection monitoring program. In accordance with Title 27, §20420(k)(5)(A-D), the Discharger is required to submit an Amended Report of Waste Discharge to establish an EMP within 90 days of determining a "measurably significant" evidence of a release. Based on the data collected from the EMP, the Discharger shall update the engineering feasibility study (EFS) for corrective action required pursuant to §20420(k)(6). The due date for the EMP report is roughly 90 days (11 August 2009) from the date of this letter. The EFS report is due roughly 180 days (11 November 2009) from the date of this letter. These due dates are consistent with the Title 27 requirements. Summary of Pending Due Dates Updated WDRs for the Harney Lane Landfill were adopted by the Central Valley Water Board during the April 2009 meeting. Finding No. 35 of WDR Order No. R5-2009-0049 states in part that MW-1 may not be suitable as a background monitoring well for monitoring parameters that can be affected by LFG, such as alkalinity,,TDS and specific conductance. To resolve this issue, Provision G.5 of the WDRs requires that the Discharger establish a background monitoring well a sufficient distance from the landfill to be outside the influence of LFG and any potential landfill leachate impacts. Provision G.5 requires a well installation work plan be submitted for approval by 15 June 2009. California Environmental Protection Agency �a Recycled Paper