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STATE OF CALIFORNIA PETE WILSON,Governor CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION 3443 ROUTIER ROAD, SUITE A & Sacramnto,CA 95827- PHONE:e(916)361-5600 3098 FAX- (916)361-56M DEC 2 0 199 1 17 December 1991 Mr. Gabriel Karam Department of Public Works County of San Joaquin P.O. Box 1810 Stockton, CA 95201 MONITORING AND REPORTING PROGRAM NO. 91-020, FOOTHILL SANITARY LANDFILL, CLASS III LANDFILL, SAN JOAQUIN COUNTY (CASE# 1928) We have reviewed your 1990 Annual Monitoring Report and the self-monitoring reports for the first three quarters of 1991. We found that the monitoring data indicates Foothill Sanitary Landfill (Foothill) is in compliance with Waste Discharge Requirements (WDRs) No. 91-020 and Monitoring and Reporting Program No. 91-020. We do have some concerns which should be addressed in either the next quarterly self-monitoring report due 15 January 1992 or the Annual Monitoring Report due 30 January 1992. Our concerns are discussed below: 1. Although the monitoring data does not indicate that a water quality impairment exists, unsubstantiated statements have been made in the monitoring reports without any explanation or discussion. For example, the reports indicate that typically the landfill monitoring well , LW1, has higher levels of TDS, chlorides, and sulfates. The reports also indicate that the samples taken from surface monitoring location, S-1, have constituents with concentrations above water quality objectives (ie. electrical conductivity (EC) = 3000 umhos/cm) . Discussion relating to monitoring data should elaborate on the significance of any anomalies or non-compliance issues identified in the tabular summaries. 2. Review of the well construction details indicates that the landfill monitoring well , LW1, is screened at a depth which is over 50 feet below the water table. The screened interval of LW1 is also 50 feet below the screened interval of the other two monitoring wells. While no monitoring data to date indicates that there is any leakage from the landfill , the County must begin efforts to replace LW1 with a monitoring well that is screened over the same interval as the other two monitoring wells.