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San Joaquin County Environmental Health Department 12066.002.000 Mountain House Neighborhood A, Units 3 and 4 January 3, 2019 SOIL GAS CHARACTERIZATION WORK PLAN ADDENDUM Revised January 8, 2019 Page 4 TABLE 1: Soil Gas Analytical Test Methods, Sample Container, Preservation, and Holding Time Requirements PARAMETER PRESERVATIVE HOLDING TIME EPA METHOD # CONTAINER SOIL GAS VOCs 30 days TO-15 1L Summa canister Groundwater Sampling One grab groundwater sample will be recovered from a separate boring adjacent to Location SG-5. The groundwater sample will be collected using Geoprobee direct-push technology; the direct-push boring will be advanced until groundwater is encountered, or to a maximum depth of 40 feet below ground surface. A temporary PVC casing will be placed in the borehole to facilitate sample collection. Following collection, the casing will be removed and backfilled with neat cement grout. Upon collection, the groundwater sample will placed into laboratory-provided sample containers. The containers will be labeled with a sample identification, sample location, date and time of collection, and sampler's identification. The groundwater sample will then be placed in an ice-cooled chest and submitted under documented chain-of-custody to Torrent Laboratory, Inc., a State-certified laboratory based in Milpitas, California. TABLE 2: Groundwater Analytical Test Methods, Sample Container, Preservation, and Holding Time Requirements PARAMETER PRESERVATIVE HOLDING TIME EPA METHOD # CONTAINER GROUNDWATER TPH-Gasoline & VOCs HCL/Ice 14 days 8260 40 ml VOA (3) TPH-Diesel & Motor Oil Ice 14 Days 8015 1,000 ml Glass REPORTING Following completion of the proposed field activities, a summary report, including all analytical results, will be prepared and submitted electronically to SJCEHD. Data summary tables for soil gas by location and depth will also be prepared for the Site chemicals of concern. Laboratory data will be presented in graphical format on figures depicting a site plan with boring locations. GPS coordinates for all sample locations will be provided to SJCEHD after completion of the fieldwork activities. Further, field documentation summarizing sampling activities and protocols will be presented in the report. The report will be signed by both a registered Professional Engineer and a Certified Hydrogeologist. SCHEDULE Sampling is scheduled to take place on January 10, 2018, for a single day. Work will be conducted between 7:00 AM and 5:00 PM. Laboratory analytical data will be available approximately three days after the completion of the field exploration. We will notify SJCEHD of daily progress and understand that SJCEHD representatives may conduct a site visit. A draft