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11 U 0 H_ 0 7 Winston H. Hickox — Secretaryfor Environmental Protection October 24, 2002 W. Michael Carroll Control Boarf Central Valley Region Robert Schneider, Chair Sacramento Main Office Internet Address: http://www.swrcb.ca.gov/rwgcb5 3443 Routier Road, Suite A, Sacramento, California 95827-3003 Phone (916) 255-3000 • FAX (916) 255-3015 San Joaquin County Dept. of Public Works Solid Waste Division P.O. Box 1810 Stockton, CA 95201 _i . / A . Gray Davis Governor EVAL UA TION MONITORING PLAN AND REVIEW OF FIRST AND SECOND QUARTER - 2002 MONITORI'GREPORT, FOOTHILL SANITAR Y LANDFILL, SAN JOA QUIN COUNTY (CASE NO. 1928) We have reviewed the record for the Foothill Sanitary Landfill. According to the Board's letter of 21 June 2002, the County was required to submit by 1 October 2002, an Evaluation Monitoring Plan. As of the date of this letter we have not received the document. We have also reviewed the Foothill Sanitary Landfill, First and Second Quarter —2002, Groundwater and Surface Water Monitoring Report, dated April 30, 2002 and July 15, 2002, respectively. Evaluation Monitoring Program ff NIP) As of the date of this letter, we have not received the EMP that was due to the Board by 1 October 2002. Based on our telephone conversation of 18 October 2002, the County stated that the EMP would be submitted by 25 October 2002. Please be aware that further enforcement action is likely if the report is not submitted by this date. First and Second Quarter Monitoring and Reporting Program 2002 Report Review First Quarter Report: Increasing trends of sulfate were found in both downgradient wells MW -2 and MW -3. Concentration Limits have recently been developed for the Foothill Landfill as part of the Report of Waste Discharge (Joint Technical Document). The Concentration Limit for sulfate is 9.5 mg/L and chloride is 10 mg/L based on the background well MW -1. MW -3 data results of 2/6/02 are 10 mg/L for sulfate, 0.5 mg/L above the Concentration Limit. The chloride concentration during the same time period in MW -3 was 12 mg/L; 2 mg/L above the new Concentration Limit. There is also an increasing trend of chloride in MW -3, which is indicative of an impacted well, especially when the upgradient MW -1 does not show a similar increasing trend. We recommend the County use the new Concentration Limits when analyzing these increases in subsequent quarterly monitoring report analyses. Traces of VOC's were detected in the upgradient well MW -1 (Acetone 6.8 ppb and Methylene Chloride 2.4 ppb), downgradient well MW -2 (Acetone 4.5 ppb, Methylene Chloride 1.6 ppb, 1,3- , California Environmental Protection Agency Co 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 httpl/www.swrcb.ca.gov/rwgcb5