Laserfiche WebLink
r <br /> G <br /> EDMUND G.BROWN JR. <br /> OOV ERPoOR <br /> C 0 6 1 F O N N 1• MATTHEW ROORIOUEZ <br /> WaterMMM �aA p SECRETARY FOR <br /> ate■ ■ ■^■ s ENVIRONMENTAL PROTECTION <br /> Central Valley Regional Water Quality Control Board <br /> 19 June 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 /> REVIEW OF NEW GROUNDWATER MONITORING WELL INSTALLATION WORK PLAN <br /> AND SUMMARY OF 26 MAY 2017 PHONE CONFERENCE, 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 issued an Notice of <br /> Violation (NOV) on 11 January 2016 requiring the NCSL to install 1) two groundwater <br /> monitoring wells in a north-northeast direction as Point of Compliance (POC) wells, 2) deepen <br /> wells G-1A and G-6, 3) evaluate the suction lysimeters for functionality, and 4) revise the <br /> lysimeter section of the Sampling and Analysis Plan (SAP). <br /> Two new groundwater wells G-7 and G-8 were installed as required by the NOV between <br /> November and December 2016. The Discharger has not deepened wells G-1A and G-6 as <br /> requested, but has evaluated the suction lysimeters and revised the SAP. The purpose of this <br /> letter is to define staff's expectations with regard to the deficient detection monitoring program <br /> (DMP) and to comment on the proposed installation of one new POC well. <br /> Deficient Detection Monitoring Program <br /> As stated above, staff issued a NOV on 11 January 2016 to address the deficiencies of the <br /> detection monitoring program (DMP) associated with the NCSL. Staff's review of the DMP <br /> indicated that multiple groundwater wells were dry and for the Discharger to maintain <br /> compliance with the WDRs, wells G-1A and G-6 needed to be deepened to reestablish the <br /> monitoring points. The request to reconstruct the wells was based on the inability of the DMP <br /> monitoring wells to provide consistent, representative samples due to decreasing water levels <br /> and the inability to properly evaluate groundwater flow direction and gradient. These concerns <br /> were described in the Monitoring and Reporting Checklist attached to the NOV. The NOV also <br /> requested that two groundwater monitoring wells be installed as POC wells north-northwest of <br /> the landfill to better define groundwater flow direction. <br /> As stated above, two new groundwater wells -7 and G-8 were installed as required by the <br /> NOV between November and December 2016. However, the Discharger has not deepened <br /> wells G-1A and G-6. <br /> KARL E. LONGLEY SCD, P.E., CHAIR 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 /> g,8 RECYCLED PAPER <br />