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EUMU NII C.13-UMI JH. <br /> GOV FH NOF <br /> MATTHEW RODRIOUEZ <br /> .......... -VIROARY FOri <br /> CNVIRONME FOrl RROTECTIOI, <br /> Water Boards — -- <br /> Central Dalley Regional Water Quality Control Board <br /> S301n1:13S1111NEI3d <br /> f,4_L1/3H-IV1N3WN08IAN3 <br /> 19 December 2013 <br /> Mr. Eric Jenks 3 <br /> Wilbur-Ellis Company <br /> P.O. Box 1030 <br /> Marysville, CA 95901 <br /> REVIEW OF T�Y`Q�FERTILIZERSER CO'ESTOCKTONNT RSAN OAQUIN COUNTYING WELL ON WORK <br /> PLAN, JOHN <br /> Staff of the California Regional Water Quality Control Board, Central Valley Region (Central Valley <br /> Water Board) has reviewed the Deeper Downgradient Monitoring Well Installation Work Plan (Work <br /> Plan) dated 12 March 2013, for the John Taylor Fertilizer (JTF) site (Site), located at 1819 South <br /> Argonaut Street in Stockton, San Joaquin County, California. The Work Plan was prepared for <br /> Wilbur-Ellis Company (Wilbur-Ellis) by Geosyntec Consultants (Geosyntec) of Oakland, California. <br /> The Work Plan proposes to monitor off-site deeper groundwater concentrations and water levels <br /> downgradient from the Site, by installing two deeper groundwater wells MW-12 and MW-13 adjacent <br /> to CPT-13 and CPT-27, respectively. Both wells will be installed with a 10-foot screen interval length <br /> targeting the coarse-grained unit within the 70-90 feet below ground surface (bgs) range. <br /> In order to complete the review of the proposed screen intervals for MW-12 and MW-13, on 15 <br /> October 2013, the Central Valley Water Board staff requested Wilbur-Ellis to submit additional <br /> geologic cross section. Specifically, staff requested to include the missing CPT location CPT-25. <br /> Geosyntec submitted the geologic cross section-CPT-10 to CPT-27 on 18 November 2013. <br /> The Central Valley Water Board staff concur with the proposed work as long as the following <br /> comments are addressed: <br /> 1. Staff concurs with the proposed screen interval targeting range of 70-90 feet bgs for the <br /> monitoring well MW-12. However, given the downward vertical gradients known to exist in <br /> this area, monitoring well MW-13 should be screened within the 80-100 feet bgs range to <br /> capture the deeper section of the coarse-grained unit. This unit is presented in the geologic <br /> cross section adjacent to CPT-27, where the location of MW-13 has been proposed. <br /> 2. All the new wells should be sampled and analyzed in accordance with the Site Monitoring and <br /> Reporting Program No. R-2010-0803. <br /> KARL E. LONCLEY SCD, P.E., GIIAIn 1 PAMELA C. CREEDON P.E., BCEE, EXGCUTIVC OrfICCR -- _ — <br /> 11020 Sun Center Drive#200,Rancho Cordova,CA 95670 1 www.waterboards.ca.gov/centralvalley <br /> C"p REOYDLED PAPER <br />