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R 1 STATE OF C3ALiFORNIA PETE WILSON,Governor CALIFORNIA REGIONAL WA i LR QUALITY CONTROL BOAR CENTRAL VALLEY REGION 3443 ROUTIER ROAD,SUITE A Sacramento, CA 95827-3098 � r PHONE: (916)361-5600 FAX (916)361-5686 ENVIRONMENTAL HEALTH PERMIT/SERVICES 16 October 1991 Mr. Wes Johnson Department of Public Works County of San Joaquin P.O. Box 1810 Stockton, CA 95201 MONITORING AND REPORTING PROGRAM 7-088, QUARTERLY MONITORING REPORTS, HARVEY LANE LANDFILL, SAN JOAQUIN COUNTY (CASE# 2598) We have reviewed your First and Second Quarter 1991 Monitoring Reports for Harney Lane Sanitary Landfill . We found that the summaries in the two reports did not discuss the elevated levels for certain constituents of concern in monitoring well , MW4. Although the summary suggested that the quality of ground water beneath the landfill is good, the level of Total Dissolved Solids (TDS) is above the Secondary Maximum Contaminant Level for State Drinking Water Standards. Furthermore, the levels for Electrical Conductivity, chloride, calcium, magnesium, and sodium are more than three times the level in the other three monitoring wells at the site. Also, dichlorodifluoromethane (Freon 1 ) was found at 3 parts per billion (ppb) in MW3 and 1 ppb in MW4. The presence of Freon 12 in these two wells was not discussed in the summary. Section 2550.8 of Title 23, Chapter 15, California Code of Regulations (Chapter 15) requires the discharger to determine whether there is statistically significant evidence of a release from the waste management unit for any monitoring point. The volatile organic compound found has no natural background, therefore, it is not necessary to use statistical methods to determine if a release of volatile organic compounds has occurred. Statistical methods are required to determine if TDS, chloride, calcium, magnesium, and sodium concentrations in downgradient wells represent a release. Article 5, Section 2550.8 (j) states that if the discharger determines that there is evidence of release, then the discharger shall immediately notify Regional Board staff verbally of the finding and shall provide written notification by certified mail within seven days of such determination. The discharger may immediately initiate verification procedures to verify that there is evidence of a release from the waste management unit. Within 90 days of determining significant evidence of a release, the discharger must submit to the Regional Board an amended Report of Waste Discharge to establish an evaluation monitoring program.