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California Repional Water Quality Coontrol Board Central Valley Region g Robert Schneider,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 26 June 2002 W.Michael Carroll San Joaquin County Department of Public Works Solid Waste Division P.O.Box 1810 Stockton, CA 95201 K4RNEYLANE SANITARYLANDFILL,FO UR TH Q UARTER/ANNUAL 2001, GROUNDWATER AND SURFACE WATER MONITORING REPORT,SAN JOA QUIN COUNTY(CASE FILE#2598) We have reviewed the Harney Lane Sanitary Landfill, Fourth Quarter/Annual 2001, Groundwater and Surface Water Monitoring Report, dated 30 January,2002 VOCs continue to be detected at trace concentrations,therefore groundwater continues to be impacted. Hexavalent chromium was detected in MW-3 and MW-4,but assumed to be from natural sources. Hexavalent chromium is not normally naturally occurring. The Board's letter of 1 February 2002 requests EPA Method 7199 be used instead of EPA Method 7196. Sequoia Analytical data sheets only show"Total Metals by EPA 6000/7000 Series Methods." Field sampling sheets do not note specific analytical methods and the Sampling and Analysis Plan shows no change in this regard. The County should ensure that hexavalent chromium is analyzed using the preferred/updated analytical method. This comment has been made in past quarterly monitoring reports for other San Joaquin County landfills with no change by the County. It is not clear in the 4"'Quarter/Annual Report which analytical method was used for hexavalent chromium. The County should rectify this issue prior to the next sampling events planned for all applicable groundwater-monitoring programs. All wells should be sampled for hexavalent chromium in order to develop background concentrations. Changes in pH have been noted in all San Joaquin landfill reports. The County indicates that this is a sampling error. Please provide an explanation for the sampling error(i.e.,equipment?) and how the.County plans to rectify the situation for the next sampling events. An increasing trend was indicated in chloride in MW-2 at 20 mg/L. Therefore, an intrawell tolerance limit was not updated for chloride in MW-2. The County notes that, although increasing,the chloride concentration is well below drinking water standards of 200 ppm. Concentrations of COCs must also be compared to the Water Quality Protection Standards (WQPS)established in WDRs. The current WDRs allow intrawell analysis in this regard. The chloride WQPS concentration limit in MW-2 is 27 mg/L. According to our records,the Evaluation Monitoring Program plan, dated October 1994, has never been updated or reviewed. If we are inaccurate in this assessment,please inform us by letter and reference the applicable document(s). The Landfill Gas Control System report was submitted in March of 1994. According to Title 27, Corrective Action Program§20430(h) Semi-Annual Progress Reports—The discharger shall report, in writing, to the RWQCB on the effectiveness of the corrective action program. The discharger shall submit these reports at least semiannually. More frequent reporting shall be required by the RWQCB as California Environmental Protection Agency 051 Recycled Paper The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at http://www.swrcb.ca.gov/rwgcb5