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Advanced <br /> GeoEnvironmental , Inc . <br /> 09 September 2009 <br /> AGE-NC Project No. 95-0184 I� <br /> Ms.Vicki McCartney " "�����.�© <br /> � <br /> San Joaquin County Environmental Health Department 10 1 5 2009 <br /> 600 East Main Street <br /> Stockton, CA 95202 ENVIRt3NMENT HEALM <br /> PERMITISERVICES <br /> Subject: Feasibility Pilot Test Work Plan <br /> LARRY'S AUTO REPAIR <br /> 308 North Grant Street, Stockton, California <br /> Dear Ms. McCartney: <br /> At the request of Mr. Charles Skobrak,Advanced GeoEnvironmental, Inc. (AGE) has prepared a <br /> response to the EHD letter dated 19 May 2009 for the directive to prepare a ground w_ater feasibili <br /> stud or the northen and southern underground storage tank(UST) sites. <br /> 1.0. BACKGROUND <br /> The site is located on the northeast corner of the intersection of Grant Street and Miner Avenue.The <br /> site is currently operated as Larry's Auto Repair and was formerly operated as De Rollo Mazda.The <br /> property is occupied by a single building with attached canopy and a parking area. In 1987, one <br /> 1,000-gallon gasoline underground storage tank (Tank A) was removed from the northwestern <br /> comer of the site. One 1,000-gallon gasoline UST and one 1,000-gallon diesel UST(Tanks B &C) <br /> were removed from beneath the sidewalk at the southeastern corner of the site in 1990.Petroleum <br /> hydrocarbons were reported in soil samples collected beneath each UST. <br /> Performance of feasibility studies are necessary to determine remedial action options for the site. <br /> The upper portion of the site section consists of silty clay and clayey silt with sand lenses <br /> encountered during drilling and soil sampling (including cone penetration testing). The primary <br /> water baring unit, which can sustain ground water recharge, is located at a depth of 60 feet below -boJ4 <br /> surface grade (bsg),the current ground water table resides at 30 feet bsg;whilethe-majority of the sum <br /> adsorbed contamination,with aromatic compounds is located thin the( pp r se,4+o f the site. rhw <br /> ss 9 <br /> The concentration of dissolved constituents collected in so>iern UST area (MV Srshallow well <br /> samples are greater than the intermediate and deeper monitoring wells (M $and Iv�W�8�. The not-56,91 <br /> concentration of dissolved constituents collected in northern UST area intermediate well samples mw'/oH,�s <br /> are lower than the shallow vapor well samples(MW-1/2 vs.V W):,The maximum concentrations of mk"e<mLvq <br /> the northern UST release area appears to reside in the upper j0, feet of the subsurface as dr <br /> demonstrated by soil and ground water samples. \ <br /> 837 Shaw Road, Stockton,CA 95215 <br /> Telephone (209)467-1006-Fax (209)467-1118 '3 ,VN'"0 <br />