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t � E <br /> EUMUNO O.BNUWN JN. <br /> Y+ GOVERNOR <br /> 0A11101.M 1• <br /> Water Boards MATTHEW ROUPIOUEZ <br /> SEGME—E—RO <br /> E IOfl <br /> ENVIROMMCNTAL PpOTGCTION <br /> Central Valley Regional Water Quality Control Board <br /> 11 April 2014 <br /> Mr. Roger Smith <br /> Glenn Springs Holdings, Inc. <br /> 5005 LBJ Freeway, Suite 1350 <br /> Dallas, TX 75244-6119 <br /> REVIEW OF WORK PLAN TO INSTALL ADDITIONAL MONITORING WELLS, FORMER <br /> OCCIDENTAL CHEMICAL CORPORATION FACILITY, LATHROP, SAN JOAQUIN COUNTY <br /> Staff of the California Regional Water Quality Control Board, Central Valley Region (Central <br /> Valley Water Board) has reviewed the Work Plan to Install Additional Monitoring Wells (Work <br /> Plan), dated 13 March 2014. The Work Plan was prepared by ARCADIS US, Inc. (ARCADIS) <br /> on behalf of Glenn Springs Holdings, Inc., (GSH) for the former Occidental Chemical <br /> Corporation manufacturing facility (Site). The Site is located at 16777 South Howland Road in <br /> Lathrop, San Joaquin County. <br /> The Work Plan proposes to install sixteen (16) additional groundwater monitoring wells on-Site <br /> and off-Site. The four (4) new monitoring wells clusters (PW33 through PW36) will each consist <br /> of three (3) monitoring wells. The two (2) shallower depth wells within each new proposed <br /> cluster will be constructed as nested wells within one borehole. Additionally, four (4) deep <br /> monitoring wells will be installed at existing clusters PW01, PW21, PW25, and PW30. <br /> The purpose of proposed Work Plan is to assess groundwater quality and groundwater flow <br /> gradients at depths up to approximately 260 feet below ground surface between the Site and <br /> potential receptors including the Simplot supply well and City of Lathrop Water District wells <br /> LWD-6, LWD-7, and LWD-8. <br /> Central Valley Water Board staff concurs with the proposed work in the Work Plan. Please <br /> provide at least a one-week notice of field activities to allow Central Valley Water Board staff the <br /> opportunity to observe the fieldwork. <br /> If you have questions or comments, please contact me at 916-464-4658, or by E-mail at <br /> ssewalia@waterboards.ca.gov <br /> Siddharth Sewalia <br /> Water Resource Control Engineer <br /> Private Sites Cleanup Unit <br /> KARL E. LONOLEV SCD, P.E.,CHAIR PAMELA C. CREEDON P.E.,BCEE,EMOUTIVE Orr10ER <br /> 11020 Sun Canter Drive#200.Rancho Cordova.CA 85870 1 www.waterboarde.C*.gov/centralvalley <br /> o RecymeO PAPl11 <br />