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wood. <br /> Wood Environment&Infrastructure Solutions,Inc. <br /> 1281 East Alluvial Avenue,Suite 101 <br /> Fresno,CA 93720-2659 <br /> USA <br /> November 23, 2020 T:559-264-2535 <br /> Project 0067410050 www.woodpic.com <br /> Mr. Brendan Kenny <br /> Central Valley Regional Water Quality Control Board <br /> 11020 Sun Center Drive, Suite 200 <br /> Rancho Cordova, California 95670 <br /> Subject: Addendum No. 1 to Southwest Pond Assessment Work Plan <br /> Lathrop Facility, San Joaquin County, California <br /> Dear Mr. Kenny: <br /> On September 30, 2020,J.R. Simplot Company(Simplot) submitted the Southwest Pond Assessment Work <br /> Plan (Work Plan) to the Central Valley Regional Water Quality Control Board (RWQCB) for a soil <br /> assessment at a former pond at Simplot's facility located in Lathrop, California.' The purpose of the <br /> assessment would be to evaluate the location and depth of soils to remove from the former pond area <br /> during closure as described in the Closure Plan—Southwest Pond(Closure Plan).2 In a letter dated <br /> November 5, 2020, the RWQCB provided comments and requested revisions to the Work Plan.3 <br /> Wood Environment & Infrastructure Solutions, Inc., has prepared this addendum to the Work Plan on <br /> behalf of Simplot. <br /> The RWQCB comments are shown below in italics, followed by the response. <br /> 1) Both the total concentrations and soluble concentrations must be reported for comparison to water <br /> quality objectives. <br /> The Closure Plan indicates, depending on the results of the soil assessment, some soils with agricultural <br /> chemicals at concentrations greater than background may be left in place following closure. Based on <br /> telephone communications with the RWQCB, the purpose of the soluble analysis requested in Comment 1 <br /> is to better evaluate the potential leachability of agricultural chemical constituents in soil that may be left <br /> in place. Soluble concentrations would be evaluated using the Waste Extraction Test (WET) described in <br /> California Code of Regulations Title 22 to determine the Soluble Threshold Limit Concentration (STLC) of <br /> constituents in the samples. <br /> 'Wood Environment&Infrastructure Solutions, Inc.,2020,Southwest Pond Assessment Work Plan, Lathrop Facility,San Joaquin <br /> County,California,September 30. <br /> z Wood Environment&Infrastructure Solutions, Inc.,2019,Closure Plan—Southwest Pond, Lathrop Facility,San Joaquin County, <br /> California,October 25. <br /> s Central Valley Regional Water Quality Control Board,2020,Review and Response to the Southwest Pond Assessment Work Plan, <br /> J.R.Simplot,San Joaquin County,November 5. <br /> 'Wood'is a trading name for John Wood Group PLC and its subsidiaries • <br />