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STATE OF CALIFORNIA PETE WILSON, Governor CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION 3443 ROUTIER ROAD, SUITE A Sacramento,CA 95827-3098 PHONE: (916)361-5600 FAX: (916)361-5686 2 14ir 0 4- OCT 2 3 J991 ENVIRONNIEN TAL HEALTH PERKI-T/SERVICES 18 October 1991 Mr. Wes Johnson Department of Public Works County of San Joaquin P.O. Box 1810 Stockton, CA 95201 779RD QUAR7ER 1991 MONITORING REPORT, NORTH COUNTY SAWTARY LANDFIL4 SAN JOAQUIN COU N7Y(CASE# 3161) We have reviewed the 9 October 1991 Third Quarter 1991 Monitoring Report (Report) submitted by EMCON Associates on behalf of North County Sanitary Landfill (County). We found the presentation of the information in the Report to be acceptable and the County in compliance with Waste Discharge Requirements Order No. 91-021 and Monitoring and Reporting Program No. 91-021. We did note that the ground water gradient for the third quarter was to the southwest. This data is consistent with the data submitted for the two previous quarters and indicate that there has been a shift in the ground water gradient from the south to the southwest. Since monitoring well, MW1, is no longer upgradient, the County must now install a new upgradient well. The County can still use the information obtained from MW for the formulation of Water Quality Protection Standards. The County should submit a workplan that includes the location, construction details, and a rationale for the location and construction of the new monitoring well. Under the new Article 5 of California Code of Regulations, Title 23, Chapter 15, which went into effect on 1 July 1991, the County must provide a financial assurance instrument for a reasonably foreseeable release, by 1 January 1992. The County should be aware of the other Article 5 requirements and the due dates associated with them.