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r California Rtegional Water Quality 'orol Board Central Valley Region Steven T.Butler,Chair Winston H.Hickox Gray Davis Secretary for Sacramento Main Office Governor Environmental Internet Address: http://www.swreb.ca.gov/-rwgcb5 Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 Phone(916)255-3000 FAX(916)255-3015 25 May 2000 Mr. Wes Johnson County of San Joaquin Department of Public Works P.O. Box 1810 Stockton, CA 95201 REVIE WOFMONITOR ING'REPORTS,NOR TB COUNTYSANITARYLANDFILL, SAN JOAQUINCOUNTY(CASENO.31") Regional Board staff has reviewed two monitoring reports for the North County Sanitary Landfill: • North County Sanitary Landfill, Fourth Quarter and Annual Report for 1999, Groundwater and Surface Water Monitoring Report, dated 15 January 2000, and • North County Sanitary Landfill, First Quarter 2000, Groundwater and Surface Water Monitoring Report, dated 15 April 2000. As we noted in our letter regarding the Foothill Sanitary Landfill, Staff has noticed that the county has elected to not conduct resampling when concentrations of constituents are detected at"estimated" values, that is concentrations that are less than the practical quantitation limit,but greater than the method detection limits. This is not in compliance with Title 27 requirements. Constituents that have a concentration limit of"detect"must be retested even though the detected amount is an estimated value. To be in compliance with Title 27,these detects should still prompt a retest to demonstrate if a release is indicated. Constituents that were detected in groundwater in either the Fourth Quarter of 1999 or the First Quarter of 2000 include: • Volatile Organic Compounds in upgradient and/or downgradient wells, • Hexavalent chromium in both downgradient wells, and • Naphthalene in upgradient well,G-l. In order to demonstrate that the presence of these compounds is not considered a release,the county shall conduct resampling. The resampling should be completed prior to 30 June 2000 and results reported to the Regional Board by 15 July 2000. I have attached a copy of each quarter's Monitoring Report Compliance Checklist that will be included in the case file for North County Sanitary Landfill. Please note the comments included at the end of each checklist. Your responses to the comments in this letter and in the checklist should be submitted to staff of the Regional Board by 30 June 2000. California Environmental Protection Agency 0 Recycled Paper