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Eouuxo G. EAUWn,IA. <br /> MArtn[v+flUOPWVF2 <br /> NITater Boards acxL,APYrop <br /> ItMRNiMLiitM pPUt[[tiU: <br /> Central Valley Regional Water Quality Control Board <br /> 16 February 2017 <br /> Roger Huckins Jr. <br /> 3436 Admiral Drive <br /> Stockton, CA 95209 <br /> FERNANDO'S PLACE, 1201 SOUTH CENTER STREET, STOCKTON, SAN JOAQUIN <br /> COUNTY, CASE#390865 <br /> California Regional Water Quality Control Board, Central Valley Region (Central Valley Water <br /> Board) staff reviewed the Additional Site Assessment Work Plan (Work Plan) dated <br /> 9 January 2017, submitted on your behalf by Advanced GeoEnvironmental Inc. (AGE)for <br /> Fernando's Place located at 1201 South Center Street in Stockton (Site). <br /> The Work Plan was submitted in response to a request by this agency in a letter dated <br /> 29 September 2016. The Work Plan includes proposals for lateral and vertical identification of <br /> groundwater impacts to the north, northeast, east and southeast of the Site, and collection of <br /> soil vapor samples near Site structures. The included proposals are as follows: <br /> • Advancement of boring B3 to 165 feet below ground surface (ft bgs), northeast of <br /> CPT-17, with grab groundwater samples to be collected at 120, 145, and 165 ft bgs. <br /> • Advancement of boring B4 to 165 ft bgs east of CPT-15, with grab groundwater <br /> samples to be collected at 50, 80, 145, and 165 ft bgs. <br /> • Advancement of boring B5 to 145 ft bgs, southeast of CPT-4, with grab groundwater <br /> samples to be collected at 50, 80, 120, and 145 ft bgs. <br /> • Advancement of boring B6 to 165 ft bgs, north of CPT-13, with grab groundwater <br /> samples to be collected at 50, 80, 125, and 165 ft bgs. <br /> • Installation and sampling of two (2) permanent soil gas wells near the Site shop <br /> structure and the L-shaped structure in the southwest corner of the Site property. <br /> I concur with the proposed scope of work as detailed in the Work Plan as long as the following <br /> conditions are incorporated: <br /> 1. The proposed borings are to be advanced to at least depths comparable to those of <br /> previous borings for which they are providing downgradient delineation. Boring B4 is <br /> proposed to be advanced to a depth of 165 ft bgs, east of boring CPT-15. Grab <br /> groundwater samples are proposed in B4 from 50, 80, 145, and 165 ft bgs. CPT-15 was <br /> reported to contain TPHg and benzene in groundwater at 192 ft bgs at concentrations of <br /> 1,600 and 500 micrograms per liter (ug1L), respectively. As such, B4 should be <br /> advanced to 220 ft bgs, with additional grab groundwater samples collected at 185 and <br /> 200 ft bgs, and at total depth. <br /> KARL E. LONGLEY SCO, P.E.• CHAIR I PAMELA C. CREEDON P.E., EICEE,EXECUTIVE OFFICER <br /> 11020 Sun Canter W.V.9200,Rancho Cordova,CH 95670 1 vp W.waterCoards.ca.gov/cemralvallay <br /> �,1 PFCYGtEU pap Ell <br />