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Advanced _ :+ <br /> Geo.Environmentn - <br /> r :;fi <br /> t of Northern California <br /> 11 August 1997 <br /> AGE-NC Project No. 97-0347 <br /> Mr. Michael Infurna <br /> San Joaquin County PHS-EHD <br /> 304 East Weber Avenue,Third Floor' <br /> Stockton,California 95202 <br /> Subject: Preliminary Site Investigation Work Plan-Addendum <br /> Former HERSHEL VANCE AUTO REPAIR <br /> 4125 East Main Street, Stockton,California <br /> Dear Mr. Infurna: <br /> In accordance with the request of Mr. Ray-Hobson,Advanced GeoEnvironmental, Inc. (AGE)has prepared <br /> this work plan addendum. Also included is a Site=specific Health and Safety Plan (SH&SP). The following <br /> additions and changes will apply to the work plan prepared by AGE: <br /> • The depth to ground water at the property was estimated to be approximately 80 feet below surface <br /> grade (bsg) based on data from 1993. However, ground water has risen significantly since 1993. <br /> Presently, ground water is estimated to be 45to 50 feet bsg. <br /> • A grab water sample will be collected from the probing advanced at.the former UST location using <br /> a Geoprobe water sampling assembly. The sample will be placed into 40-m1 EPA-approved VOA <br /> vials and transported in a chilled container to a state-certified laboratory for analysis. Additional <br /> grab water samples may be' collected based upon field observations. <br /> • All soil and ground water samples will be analyzed in accordance with EPA method 8260 for seven <br /> oxygenates in addition to total petroleum hydrocarbons quantified as <br /> .gasoline(TPH-g)and volatile <br /> aromatics(benzene,toluene,ethylbenzene and xylenes: BTE&X)with methyl tertiary-butyl ether. <br /> (MTBE) <br /> If you have any additional questions or comments, please contact our office at(209)956-0264. <br /> Sincerely,' <br /> Advanced GeoEnvironmental,Inc. <br /> Kevin McKibben <br /> Senior Staff Geologist <br /> enclosure <br /> cc: Ray Hobson (w/o enclosure) <br /> Jim Rice (w/o etj%jjy �t March Lane,Suite A,Stockton,California 95207. <br /> Telephone(209)956-0264 FAX(209)956-0700 <br /> Advanced GeoEnvironmental,Inc. <br />