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} EDMUND G.BROWN JR. <br /> �1. '. GOVERNOR <br /> O A 61 F O W N 14 MATTHEW RODRIQUEZ <br /> SECRETARY FOR <br /> aterar ENVIRONMENTAL PROTECTION <br /> Central Valley Regional Water Quality Control Board <br /> 11 January 2016 JAN 19 20' <br /> R®LAMENT <br /> Mr. Taj M. Bahadori, PE E /T/SFR�C SCTH <br /> Senior Civil Engineer <br /> San Joaquin County Public Works, Solid Waste Division <br /> 1810 E. Hazelton Avenue <br /> Stockton, CA 95201 <br /> NOTICE OF VIOLATION, REVIEW OF FIRST HALF 2015 GROUNDWATER AND SURFACE <br /> WATER MONITORING REPORT AND SITE INSPECTION, NORTH COUNTY SANITARY <br /> LANDFILL, SAN JOAQUIN COUNTY <br /> The North County Sanitary Landfill (NCSL) is owned and operated by San Joaquin County <br /> (Discharger), and is regulated by Waste Discharge Requirements (WDRs) Order R5-2010-0016 <br /> for construction, operation, and monitoring of the Class III Landfill. Staff has reviewed the 1" <br /> Semi-annual 2015 Groundwater and Surface Water Monitoring Report for the North County <br /> Sanitary Landfill (NCSL). <br /> Inadequate Monitoring <br /> Based on a review of the 1St half 2015 report, staff finds the Detection Monitoring Program <br /> (DMP) is inadequate to determine whether there is a release to groundwater from the waste <br /> management unit (WMU). Specifically, the groundwater flow direction is north-northeast making <br /> upgradient well G-1A downgradient and wells G-2 through G-6 side or upgradient of <br /> groundwater flow. Staff's review indicates there are no monitoring points of compliance (POC)' <br /> in the north-northeast direction, which would serve to determine if a release to groundwater has <br /> occurred. The current groundwater flow condition beneath the WMU and the wells associated <br /> with the DMP do not comply with WDRs R5-2010-0016, Monitoring Specification E.1. <br /> Vadose zone monitoring devices (VZ-1 through VZ-8) are reported as dry. Field sheets indicate <br /> that vacuum of 70 centibars is applied and then re-checked approximately 24-hours later. Staff <br /> has reviewed various industry articles on lysimeters and the current operation of these <br /> monitoring devices. The literature recommends that 60 centibars2 is all that is required to <br /> extract a sample. Industry articles also suggest a time interval from when the vacuum is applied <br /> to when an attempt to.draw a sample from the lysimeter is performed. Anymore vacuum may <br /> make the lysimeter ineffective at drawing soil pore liquid, which may be why NCSL is unable to <br /> obtain vadose zone sampling data. <br /> 1 "Point of Compliance"(SWRCB) means a vertical surface located at the hydraulically downgradient limit of a waste <br /> management unit(Unit)and that extends through the uppermost aquifer underlying the Unit. <br /> 2 Everett, L. G.and McMillion, L. G. (1985), Operational Ranges for Suction Lysimeters. Groundwater Monitoring& <br /> Remediation,5: 51-60. doi: 10.1111/j.1745-6592.1985.tb00929.x <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 95670 1 www.waterboards.ca.gov/centralvalley <br /> Co RECYCLED PAPER <br />