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'j EDMUND G. BROWN JR. <br /> 2n GOVERNOR <br /> CAL 1 l O W M l q MATTHEW RODRIQUEZ <br /> ater Oar ^ SECRETARY FOR <br /> \V ENYIRORY FOR <br /> PROTECTION <br /> Central Valley Regional Water Quality Control Board <br /> RECEIVED <br /> 6 March 2018 MAR 0 8 2-01,3 <br /> ENVIRONMENTAL til'AL1-11 <br /> Mr. Taj M. Bahadori, PE 1)EPA 1Z FN I.NT , <br /> Senior Civil Engineer <br /> San Joaquin County Public Works, Solid Waste Division <br /> 1810 E. Hazelton Avenue <br /> Stockton, CA 95201 <br /> APPROVAL OF GROUNDWATER MONITORING WELL INSTALLATION WORK PLAN AND <br /> OUTSTANDING COMPLIANCE ISSUES, NORTH COUNTY SANITARY LANDFILL, SAN <br /> JOAQUIN COUNTY <br /> The North County Sanitary Landfill (NCSL) is owned and operated by San Joaquin County Solid <br /> Waste Division (Discharger), and is regulated by Waste Discharge Requirements (WDRs) Order <br /> R5-2010-0016 for construction, operation, and monitoring of the Class III Landfill. <br /> The North County Sanitary Landfill and the Discharger have been out of compliance with the <br /> WDRs due to a lack of a compliant Detection Monitoring System (DMP). Staff has issued two <br /> Notice of Violations (NOVs) dated 17 October 2017 and 8 January 2018 outlining the <br /> requirements for compliance. The submittal of this work plan proposing to install three new <br /> groundwater monitoring wells at locations adjusted to current flow direction is part of the <br /> requirement to meet compliance. <br /> Staff has reviewed the work plan. The Discharger is proposing to install three groundwater <br /> monitoring wells (G-513, G-10, and G-11) at depths and locations that will ensure viable <br /> groundwater monitoring wells able to reliably measure depth to groundwater and to collect <br /> consistent, representative groundwater samples. The wells are being installed and constructed <br /> using a C-57 licensed drilling contractor and soils encountered will be identified and logged in <br /> accordance with ASTM D2488, under the direct supervision of a California Professional <br /> Geologist or Civil Engineer. The wells will be constructed with 20-feet of well screen that shall <br /> intersect the water table. Once installed, the wells will be developed a minimum of 48-hours <br /> following the placement of the sanitary seal. Well development will be performed a maximum of <br /> seven (7) days after the placement of the sanitary seal. <br /> As of 5 March 2018, staff understands that well -10 and G-11 have been completed and that <br /> well G-513 will be drilled starting the week of 5 March 2018. As discussed in the 29 January <br /> 2018 staff email, a compliant monitoring network requires the County to perform several tasks <br /> below, prior to 30 March 2018 that includes the following: <br /> 1. Survey and measure depth to groundwater from all viable site wells on the same day of <br /> measurement (submit depth to groundwater field log); <br /> KARL E. LONGLEY SCD, P.E., CHAIR I PAMELA C. CREEDON P.E., BCEE, EXECUTIVE OFFICER <br /> 11020 Sun Center Drive#200,Rancho Cordova,CA 85670 1 www.waterboards.ca.gov/contralvalley <br /> C'pRECYCLED PAPER <br />