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Dopaco Inc. Area Case #3 - 2 - 31 January 2022 <br /> <br /> <br />Table 1 – Summary of Proposed Soil Sampling <br />No of <br />Borings <br />Total <br />Depth Collection Depths Sample Selection for <br />Analysis Analysis <br /> (ft bgs) (ft bgs) <br />4 10 Every 0.5 feet from <br />0-10 feet bgs <br />4 samples1 from each <br />boring with highest PID <br />TPHg, TPHd, <br />BTEX, naphthalene <br />TPHg= total petroleum has gasoline; TPHd= TPH as diesel; BTEX= benzene, toluene, <br />ethylbenzene, total xylenes; PID= photo-ionizing detector; ft bgs= feet below ground <br />surface; <br />1= two samples from 0-5 feet bgs, and two samples from 5-10 feet bgs <br /> <br />Table 2 – Summary of Proposed Soil Gas Wells and Sampling <br />No of <br />Borings <br />Top of <br />Filter Sand <br />Top of <br />Probe Seal Type QA/QC Measures Analysis <br /> (ft bgs) (ft bgs) <br />4 5 5.5 Bentonite/ <br />temporary <br />Sampling shroud <br />and helium leak <br />detection comound1 <br />BTEX, <br />naphthalene, <br />oxygen, helium <br />BTEX= benzene, toluene, ethylbenzene, total xylenes; ft bgs= feet below ground surface; <br />1= Helium concentration under shroud will be quantified for comparison to helium <br />concentration in soil gas sample. <br /> <br />3. In the Work Plan, AECOM proposes to submit the results of the proposed scope of <br />work as part of the 1st quarter 2022 Groundwater Monitoring Report (GMR). <br />Central Valley Water Board staff concurs, and requests that you submit the <br />combined GMR and Site Assessment Report by 1 May 2022. <br /> <br />If you have any questions or concerns regarding comments in this letter or regarding the <br />Site, please contact Alan Buehler at (916) 464-4615 or by email at <br />alan.buehler@waterboards.ca.gov. <br /> <br /> <br />Alan M. Buehler, P.G. Galvin Kauffman, P.G. <br />Engineering Geologist Senior Engineering Geologist <br /> <br /> <br /> <br /> <br /> <br /> <br /> 0 <br /> <br /> <br />cc: Scott Little, AECOM, San Jose (email)