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EDMUND G. BROWN JR. <br />GOVERNOR <br />Water Boards <br />Central Valley Regional Water Quality Control Board <br />4 June 2018 <br />MATTHEW ROORIOUE: <br />SECRETARY FOS <br />NVISONEAENTAI PROTECT!. <br />&/c <br />56 56 <br />Navdeep Mehta <br />SM Horizon Corporation <br />4360 Jessica Circle <br />Fremont, CA 94555 <br />QUICK-N-SAVE #2, 2057 EL DORADO STREET, STOCKTON, SAN JOAQUIN COUNTY, <br />CASE# 391086 <br />Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff <br />reviewed the Work Plan for Additional Site Investigation (Work Plan) dated 18 May 2018, <br />submitted on your behalf by Stratus Environmental Inc. (Stratus) for the Quick-N-Save #2 <br />unauthorized petroleum release at 2057 El Dorado Street in Stockton (Site). <br />In the Work Plan, and clarifications in a 1 June 2018 email from Mr. Scott Bittinger, Stratus <br />proposes to advance four (4) off-site cone penetration test (CPT) borings, as detailed in the <br />table below. <br />Boring Location Total <br />Depth <br />(ft bgs) <br />Soil Sampling Groundwater Sampling <br />Depth <br />(ft bgs) <br />Analysis Depth <br />(ft bgs) <br />Analysis <br />CPT-5 <br />thru <br />CPT-7 <br />Downgradient <br />of CPT-3 & <br />CPT-4 <br />120 None None 4ft sampling intervals <br />every —15ft; between <br />—40-55ft, —55-70ft, <br />—70-85ft, —85-100ft, <br />and —100-115ft <br />GRO, BTEX, <br />MTBE, TBA, <br />DIPE, TAME, <br />ETBE, <br />1,2-DCA CPT-8 <br />Near USTs at <br />2070 S. El <br />Dorado St. <br />120 15, 23, <br />31, 39 <br />GRO, BTEX, <br />MTBE, TBA, <br />DIPE, TAME, <br />ETBE <br />GRO=gasollne range organics, BTEX=benzene, toluene, ethylbenzene, xylenes; MTBE=rnethyl tert butyl ether; TBAtert buty <br />alcohol; DIPE=di-isopropyl ether; TAME=tert amyl methyl ether; ETBE=ethy tert butyl ether; 1,2-DCA=1,2-dichloroethane; <br />ft bgs=feet below ground surface <br />Central Valley Water Board staff concur with the proposed scope of work with the following <br />comments: <br />While the Work Plan states that at least five groundwater samples will be collected from <br />all four of the proposed borings, as noted in the table above, in his 1 June 2018 email <br />Mr. Bittinger indicates that only a shallow groundwater sample will be collected from <br />CPT-8. Please collect at least the five samples from each boring as proposed in the <br />Work Plan. <br />By 7 September 2018, please submit an Assessment Report, detailing completion of the <br />proposed scope of work and the resultant findings. Please also include conclusions and <br />KARL E. LONGLEY ScD, P.E. CHAIR PAMELA C. CREEDON PE., BCEE, EXECUTIVE OFFICER <br />11020 Sun Center Dnve 6200, Rancho Cordova, CA 95670 www.watarboards.sa.govicentralvalley <br />Recrueo PAPER