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r <br /> December 23, 1996 t I L <br /> Mr. Michael Infurna <br /> San Joaquin County Public Health Services ENVIRONMENTAL HEALTH DIVISION <br /> Environmental Health Division 304 E.Weber Ave Third Floor <br /> P O Box 388 P, O. Box 388,St2goern CA 95201-0388 <br /> Stockton, California 95201 Approved <br /> El <br /> Denied � � <br /> Conditions _ _ <br /> Re: Site Investigation Work Plan <br /> Former Shell Service Station <br /> 1265 - 1267 Country Club Blvd <br /> Stockton, Cahfornia <br /> Dear Mr Infurna <br /> This work plan has been prepared by Enviros, Inc (Enviros) on behalf of Shell Oil <br /> Products Company in response San Joaquin County Public Health Services (SJCPHS) <br /> correspondence dated October 11, 1996 requesting a site investigation to delineate <br /> petroleum hydrocarbons previously identified in soil and ground water The scope of work <br /> presented in this document will comply with SJCPHS and Regional Water Quality Control <br /> Board (RWQCB) guidelines <br /> iSite Description and Background <br /> The subject property is located on the northeast corner of the intersection of Country Club <br /> Boulevard and Pershing Avenue and is presently occupied by a vacant bank building <br /> According to information contained in the "Phase 1 and 11 Environmental Site Assessment" <br /> dated August 1995, prepared by Geosystem Consultants, Inc (GCI), the site was <br /> developed in 1949 as a Shell service station, which operated until 1974 A total of four <br /> gasoline underground storage tanks (USTs) and one waste oil UST were operated as part <br /> of the service station The approximate locations of these tanks are shown on Plate 2 <br /> Eight soil borings were drilled and soil samples were collected by GCI during April 1995 <br /> Ground water samples were also collected from three of the borings Samples were <br /> analyzed for Total Petroleum Hydrocarbons calculated as Gasoline and Diesel (TPH-G and <br /> TPH-D) and Benzene,Toluene, Ethylbenzene, and Xylenes (BTEX) Samples in the <br /> vicinity of the former waste oil tank were also analyzed for Total Recoverable Petroleum <br /> Hydrocarbons (TRPH) <br /> Concentrations of TPH-G in soils ranged from non-detect(ND) to 1900 parts per million <br /> (ppm) TPH-D concentrations ranged from ND to 700 ppm Benzene concentrations <br /> ranged from ND to 3 9 ppm <br /> Ground water samples contained TPH-G concentrations ranging from 23,000 parts per <br /> billion (ppb) to 150,000 ppb, TPH-D concentrations ranging from 1600 to 12,000 ppb, <br /> and benzene concentrations ranging from 970 ppb to 13,000 ppb <br /> anvlron, Inc 270 Perkins Street Sonoma CaPfomia Tel 707/935 4850 <br /> P 0 Sox 269 95476 0259 Fax 707/935 6649 <br />