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EDMUND G.BPOWN JR. <br /> �� j. GOVEPNOP <br /> CAI.IPONM/A MATTHEW RODRIOUEZ <br /> LTH c pe T'&1 SECRETARY FOR <br /> GLa�6'1 Boards ENTAL HEALTH <br /> 4J ENVIRONMENTAL PROTECTION <br /> pRONNM1T►SERVICES <br /> Central Valley Regional Water Quality Control Board <br /> 17 October 2017 <br /> Mr. Taj M. Bahadori, PE <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 2017 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 1St <br /> Semi-annual 2017 Groundwater and Surface Water Monitoring Report for the North County <br /> Sanitary Landfill (NCSL) and prepared a Site Inspection Report. <br /> Inadequate Monitoring: Violation #1 <br /> Based on a review of the 1St half 2017 report, staff finds the Detection Monitoring Program <br /> (DMP) remains inadequate to determine whether there is a release to groundwater from the <br /> waste management unit (WMU). To counter this condition, the Discharger installed two <br /> groundwater monitoring wells G-7 and G-8, located north and northwest of Module 1, <br /> respectively. Both wells were able to provide groundwater samples during the initial monitoring <br /> event in February 2017. However, no other groundwater samples were collected or reported <br /> during the first half 2017 sampling event. This is a violation of the WDRs and must be corrected <br /> forthwith. <br /> Release of Waste Outside of Unit: Violation #2 <br /> Methane was detected in soil gas probe SG-6 at approximately 18%. This is consistent with the <br /> first semi-annual 2015 monitoring event that reported methane at 13%. SG-6 is located <br /> southeast of Module M1/M3 and the continued detections of methane and increase in <br /> concentration is an indication the landfill gas (LFG) extraction system is not controlling the <br /> migration of LFG from the unit. This is a violation of the WDRs. The current LFG extraction <br /> system consists of seven (7) extraction points, meanwhile, module M1/M3 is 47 acres in size. <br /> With only one well for every 6.7 acres of landfill, along with methane at 18 percent, suggests <br /> that the current LFG system in not complete and will require enhancement to properly control <br /> the migration of LFG from the unit. <br /> Site Inspection <br /> Staff conducted a site inspection on 1 August 2017. The purpose was to observe the <br /> installation and testing of the suction lysimeters installed with a pan lysimeter of Module 5B. <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 ( www.waterboards.ca.gov/contralvaliey <br /> C'p RECYCLED PAPER <br />