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REGEWLL) <br /> MAR 18 2015 <br /> Eoxuno O. Bnowx Jn. <br /> ENVIRONMENTAL HEALTH "' eO.rexex <br /> PERMITISERVICESl , Mnnxaw ROORIOa6i <br /> V ZNVIAO.Mv .eR <br /> Water Boards ex Ex.�.xer.e.I0� <br /> Central Valley Regional Water Quality Control Board <br /> 16 March 2015 <br /> Xiaosong Wang <br /> Pilkington North America, Inc. <br /> 500 East Louise Avenue <br /> Lathrop, CA 95330 <br /> SITE GROUNDWATER INVESTIGATION WORK PLAN COMMENTS; <br /> PILKINGTON NORTH AMERICA INC, 500 EAST LOIUSE AVENUE, LATHROP, <br /> SAN JOAQUIN COUNTY <br /> Staff of the Central Valley Regional Water Quality Control Board (Regional Water Board) have <br /> reviewed the 6 June 2014 Site Groundwater Investigation Work Plan (Work Plan) submitted on <br /> behalf of Pilkington North America (PNA) by Condor Earth Technologies for a diesel fuel spill at <br /> 500 East Louise Avenue in Lathrop (Site). The Report was submitted to address the Regional <br /> Water Board Response to Closure Request letter, dated 19 March 2013, requesting a work plan <br /> to investigate whether TPH from the release has migrated to deeper soil strata, define the <br /> down-gradient extent of contamination, determine if site pollution is migrating offsite, and <br /> develop a plan to restore the quality of the groundwater. In addition, Regional Water Board staff <br /> requested construction and operation details for the sumps located in the interior, including what <br /> materials are discharged to the sumps. <br /> Steps to Site Closure <br /> The following steps need to be completed to bring this site to case closure consideration <br /> 1) Develop a sufficient conceptual site model, <br /> 2) Remove free product and secondary sources to the maximum extent practicable, and <br /> 3) Demonstrate that Water Quality Objectives will be met within a reasonable timeframe. <br /> The proposed Work Plan includes: <br /> Groundwater Investigation <br /> A groundwater investigation for dissolved contamination using direct push boring <br /> procedures in fourteen locations with sampling of first encountered groundwater <br /> KARL E. LONOLEY SCD, P.E., CRAIR I PAMELA C. CREEOON P.E., HCEE, EXECUTIVE OFFICER <br /> 11020 Sun Center Drive 4200,Rancho Cordova,CA 95670 1 www.waterboards.ca.gov/centralvSllOy <br />