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00:000 <br />Water Boards <br />EDMUND G. BROWN JR. <br />O<NOwd, <br />Mr.r.r.ve RODRIQUEZ <br />SECRO-AW FOR <br />FRWRONLIERTAl PROTiONOR <br />Central Valley Regional Water Quality Control Board <br />7 November 2016 <br />Min Le <br />McBillin Real Estate Investment <br />3293 Napa Drive <br />San Jose, CA 95148 <br />McBILLIN REAL ESTATE INVESTMENT, 2154 SOUTH EL DORADO STREET, STOCKTON, <br />SAN JOAQUIN COUNTY, CASE# 391184 <br />The Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff reviewed <br />the Revision to Work Plan Addendum — July 2016 dated 10 October 2016 (Soil Gas Work Plan) and <br />the Site Assessment Monitoring Well Installation Work Plan Addendum — October 2016 dated <br />25 October 2016 (Site Assessment Work Plan). These reports were submitted on your behalf by <br />Advanced GeoEnvironmental Inc. (AGE) for the McBillin Real Estate Investment property at 2154 <br />South El Dorado Street in Stockton (Site). <br />AGE previously submitted a Work Plan Addendum dated 29 July 2016 and the Monitoring Well <br />Installation Work Plan Addendum — August 2016 dated 8 August 2016, in which they proposed the <br />installation of monitoring wells and soil gas sampling. However, permanent soil gas wells are needed <br />in order to provide sampling points capable of multiple sampling events. In addition, based on high <br />benzene concentrations reported in borings B-6 through B-8, the proposed wells were not sufficient to <br />delineate groundwater pollution laterally and vertically to the northeast, east, and southeast of the <br />Site. Furthermore, shallow soil sampling is needed on the property to evaluate potential risks from <br />dermal contact exposures, and soil sampling is needed near the former waste oil tank (Tank #1) to <br />properly evaluate if a release from this tank has occurred. <br />The submitted Soil Gas Work Plan and Site Assessment Work Plan propose the following wells, <br />borings, soil sampling, and grab groundwater sampling to address the concerns noted above: <br />Location Total Depth <br />(ft bgs) <br />Screened Interval <br />(ft bgs) Soil Sampling Grab Groundwater Sampling <br />(ft bgs) <br />MW-11 100 90-100 - 55-65 <br />MW-12 100 90-100 - - <br />MW-13 40 20-40 - -- <br />B-10 65 -- every 5 ft* 55-65 <br />B-11 20 - every 5 ft* -- <br />B-12 5 - 5 ft - <br />B-13 5 -- 5 ft -- <br />B-14 125 - -- 55-65; 90-100; 115-125 <br />B-15 125 -- - 55-65; 90-100; 115-125 <br />B-16 125 - -- 55-65; 90-100; 115-125 <br />B-17 125 -- - 55-65; 90-100; 115-125 <br />SV-1 6.5 - - -- <br />SV-2 6.5 5.5-6 - - <br />SV-3 6.5 5.5-6 - - <br />Samples collected from 5 ft to Total Depth; ft bgs = feet below ground surface <br />KARL. E. LONGLEY ScD, P.E., CHAIR I PAMELA C. CREROON PE. BCEE, E.XeCtrrivE OFFICOR <br />11020 Sun Center Drive 6200, Rancho Cerdeve, CA 95670 i vevne.weterboards.ea.gov/eentralvalley <br />viceveLan .....