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• - • /W/,U�t � • <br /> jl l 1011-1rc. r3Rnw,Ja. <br /> Li 1c U <br /> rxATTHEW vwr xurx nneamA.--�' o <br /> ,r. ol. <br /> Water Boards <br /> Central Valley Regional Water Quality Control Board —AeCeVEol <br /> AUG 0.9 7011 <br /> 8 August 2012 AL <br /> PE M�S RVIC 3 LTN <br /> Greg McIver <br /> The Source Group, Inc. <br /> 944 McCourtney Road, Suite H <br /> Grass Valley, CA 95949 <br /> DOCUMENT REVIEWS FOR EAR ACCOUNT CASE# R10-129, <br /> FORMER COUNTRYSIDE MARKET, 10848 COPPEROPOLIS ROAD, STOCKTON, <br /> SAN JOAQUIN COUNTY(RB #390783) <br /> 1 reviewed the Site Investigation Report (Report) and Site Investigation Work Plan <br /> (Workplan), received as one document on 18 July 2012 from The Source Group, Inc. <br /> (TSGI). The Report provided the results of research, and soil and groundwater <br /> investigations conducted from 2 November 2011 to 1 May 2012. The Workplan <br /> proposed installation of two additional groundwater monitoring wells (MW-6 and MW-7) <br /> and three offsite soil borings (SB-1 through SB-3) to delineate the downgradient extent <br /> of the groundwater plume. <br /> The Report states that a Phase 1 Environmental Data Resource (EDR) report, <br /> generated 2 November 2011 as part of the due diligence search of records, did not <br /> identify additional nearby reported petroleum hydrocarbons or chemical releases. The <br /> EDR and a California Department of Water Resources well log search, conducted on <br /> 28 December 2011, identified thirty two (32) sensitive receptors within a 2,000' radius of <br /> the Site. Fifteen (15) domestic wells were located within a 500' radius of the site. <br /> Seven (7) domestic wells and the one (1) domestic well located at the Site were <br /> selected for sampling based on the groundwater flow direction noted below. <br /> From 9 January 2012 to 17 January 2012, five groundwater monitoring wells (MW-1 <br /> through MW-5) were installed and screened from 80' below ground surface (bgs). <br /> MW-1 through MW-5 were sampled on 25 January 2012 and 1 May 2012. Depth to <br /> water varied from 87' bgs to 88' bgs (January 2012) and from 88' bgs to 89' bgs <br /> (May 2012). Groundwater flow direction was towards the northeast at a gradient of <br /> 0.002 ft/ft (January) to 0.003 ft/ft (May). Groundwater monitoring results are given in <br /> micrograms per Liter (ug/L) in Table 1 below: <br /> KARL E. LCNOLEY ScD, P.E., DnAIR I PAMELA C. C+REEDON P.E., BCEE, EXECUTIVE OFFICER <br /> 11020 Sun C.M.r Drive 11200,RaOCdo Cordova.CA 95670 1 www...U,rb.ards Ca.gov/danlralvalley <br /> Ci nccvo.co r.... <br />