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PARTNER Engineering and Science, Inc. November 5,2014 Mr.Nuel C. Henderson,Jr. San Joaquin County Environmental Health Department 1868 Hazelton Avenue Stockton,California 95205 Subject: Additional Assessment Workplan Addendum White Arrow 2402 South California Street Stockton, California 95206 Partner Project No. 14-117725.2 Dear Mr. Henderson: Partner Engineering and Science, Inc. (Partner), on behalf of White Arrow, has prepared this Additional Assessment Workplan Addendum (Addendum) for the above-referenced site. This Addendum was prepared in response to a telephone conversation on November 5, 2014 from the San Joaquin County Environmental Health Department (EHD) requiring additional information for an October 8, 2014 dated Additional Assessment Workplan prepared by Partner. Soil Sampling Methodology Soil samples will be collected using a 4-foot long by 2.25-inch diameter MacroCore sampler with a 4-foot long acetate liner, which will be advanced by the direct-push drill rig using 4-foot long by 1.5-inch diameter drill rods. The sampler will be driven into the subsurface to allow undisturbed soil to enter the open MacroCore barrel and retrieved in 4-foot intervals to recover the soil-filled liners. A lengthwise section of each acetate liner will be removed with a splitting tool to expose the soil. The soil column will be visually inspected for discoloration, monitored for odors, and classified in accordance with the Unified Soil Classification System (USCS). Select intervals will be placed in sealable plastic bags and field-screened with a photoionization detector(PID) calibrated to isobutylene. Soil depths selected for laboratory analysis will be sampled directly from the liners using a disposable plastic syringe and retained in two sodium bisulfate-preserved volatile organics analysis (VOA) vials in accordance with United States Environmental Protection Agency(EPA) Method 5035 sampling protocol. A sample will also be collected by transferring soil into a laboratory-supplied, 4-ounce, wide-mouth, unpreserved glass jar,which will be sealed with a threaded,Teflon-lined lid. The jars will be filled with soil to capacity to minimize headspace and reduce the potential for volatilization. The jars and VOA vials will be labeled for identification and stored in an iced cooler. The boreholes will be backfilled with neat cement and capped with concrete to match existing ground cover,as necessary,upon completion of sampling. 2154 Torrance Blvd., Suite 200, Torrance, CA 905010 Phone 800419-4923 0 Fax 866-928-7418