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Sincerely, <br />ENGEO Incorporated <br />Cody Johnson, GIT Shawn Munger, CHG <br />Attachments: Figures 1-2 <br />Appendix A — Soil Gas Sampling Procedures <br />San Joaquin County Environmental Health Department <br />12066.002.000 <br />Mountain House Neighborhood A, Units 3 and 4 <br />January 3, 2019 <br />SOIL GAS CHARACTERIZATION WORK PLAN ADDENDUM <br />Page 4 <br />TABLE 1: Analytical Test Methods, Sample Container, Preservation, and Holding Time <br />Requirements <br />PARAMETER PRESERVATIVE HOLDING TIME EPA METHOD # CONTAINER <br />SOIL GAS <br />VOCs 30 days TO-15 1L Summa <br />canister <br />REPORTING <br />Following completion of the proposed field activities, a summary report, including all analytical <br />results, will be prepared and submitted electronically to SJCEHD. Data summary tables for soil <br />gas by location and depth will also be prepared for the Site chemicals of concern. Laboratory <br />data will be presented in graphical format on figures depicting a site plan with boring locations. <br />GPS coordinates for all sample locations will be provided to SJCEHD after completion of the <br />fieldwork activities. Further, field documentation summarizing sampling activities and protocols <br />will be presented in the report. The report will be signed by both a registered Professional <br />Engineer and a Certified Hydrogeologist. <br />SCHEDULE <br />Sampling is scheduled to take place on January ,8, 2018, for a single day. Work will be <br />conducted between 7:00 AM and 5:00 PM. In the event of significant rain occurance, sampling <br />will be rescheuled a minimum of five days without a significant rain event. Areas being sampling <br />will be free of standing or ponded water for at least five days prior to sampling. Laboratory <br />analytical data will be available approximately three days after the completion of the field <br />exploration. We will notify SJCEHD of daily progress and understand that SJCEHD <br />representatives may conduct a site visit. A draft summary report will be provided to SJCEHD for <br />review within 1 week following the completion of the field exploration. <br />If you have any questions on any portion of the work plan, please call and we will be glad to <br />discuss them with you.