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0:0000 <br />Water Boards <br />BROWN JR. <br />MATTHEW RODRIQUEZ <br />SECRE1ARY FOR <br />EtiVIRORMENTAL PROTECIION <br />Central Valley Regional Water Quality Contror Boa-et <br />21 November 2017 <br />Bill Filios <br />AKF Development LLC. <br />1463 Moffet Blvd. #5 <br />Manteca, CA 95219 <br />REVIEW OF CLOSURE WORK PLAN, FORMER SPRECKELS SUGAR COMPANY, <br />PARCEL 35, 407 SPRECKELS AVENUE, MANTECA, SAN JOAQUIN COUNTY <br />Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff <br />reviewed the 2 November 2017 Closure Work Plan submitted by Kleinfelder on behalf of AKF <br />Development LLC. (Discharger) for the Former Spreckels Sugar Company, Parcel 35 at 407 <br />Spreckels Avenue in Manteca, San Joaquin County (Site). The Closure Work Plan summarizes <br />previous investigation work and proposes additional investigative work to fill in data gaps in the <br />existing data set. <br />Previous Investigations and Proposed Scope-Of-Work <br />A number of Phase II investigations were completed on the Site beginning in 1997 to evaluate <br />potential impacts from the sugar-processing facility. At the time, oversight of the environmental <br />activities was completed by the San Joaquin County (County); however, Site closure was never <br />granted by the County. The Discharger is now seeking Site closure from the Central Valley <br />Water Board. To facilitate closure, the Closure Work Plan compares the previous investigation <br />results to the current screening levels and provides recommendations for moving towards <br />requesting no further action for the Site. <br />The Site investigation areas have been divided out into eleven operable units based on previous <br />Site operational activities, as shown in Table 1 below. During the Phase II investigations, <br />numerous potential constituents of concern (COCs) were evaluated in each operable unit area. <br />The Discharger compared the previous Phase II investigation results against the current <br />residential, industrial, and groundwater protection screening levels to determine what additional <br />evaluations and what additional data are needed for site characterization. Based on the <br />Discharger's analysis, the remaining COCs that need to be evaluated are listed in Table 1 for <br />each operational unit. <br />Table 1 Operable Unit Constituents of Concern <br />Operable <br />Unit No. Description Remaining <br />Constituents of Concern <br />1 Septic Tanks and Leach Lines near the Cane Slab Metals, Petroleum-related, <br />General Chemistry <br />2 Two Former Underground Storage Tanks Petroleum-related <br />3 Former Above Ground Storage Tanks at the <br />Former Drum and Waste Oil Storage Area Petroleum-related <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 I www.waterbOards.ca.gov/centralvalley <br />C., RECYCLED PAPER