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s pp <br /> `moi( <br /> r <br /> V <br /> Advanced <br /> `• Ge.oEnvironment L Inc. = _ <br /> 17 November 2003 <br /> RECE , . <br /> AGE-NC Project No 95-0103 NOV 17 2003 <br /> Mr Harlin Knoll ENVIRONMENT HEALTH <br /> PERMIT/SERVICES t <br /> San Joaquin County- Environmental Health Department(EHD) <br /> '304 E Webber Avenue, 3'Floor <br /> Stockton, CA 95201 <br /> Subject: Additional Site Assessment Work Plan <br /> CHAPIN BROTHERS INVESTMENTS, INC. <br /> 1766 Monte Diablo Avenue, Stockton, California <br /> Dear Mr Knoll <br /> At the request of Mr Russell Chapin,Advanced GeoEnvironmental, Inc (AGE) has prepared the <br /> enclosed Work Plan for on-site assessment at 1766 Monte Diablo Avenue, Stockton,California(the <br /> site) The objective of this investigation is to assess the amount ofremaining contaminants in soil and <br /> ground water beneath the site building, the scope of work includes the advancement of five soil <br /> borings at thirty-degree angles under the building The location of the site and its surroundings are <br /> illustrated in Figure 1 Structures, well locations and proposed boring locations are illustrated in <br /> Figure 2 <br /> Investigation activities will be performed in accordance with guidelines for investigation of <br /> underground storage tank(UST)sites established by the San Joaquin County-Environmental Health <br /> Department (EHD) and Central Valley Regional Water Quality Control Board (CVRWQCB) <br /> BACKGROUND <br /> A soil vapor extraction(SVE)/in-situ air-sparging(IAS)system was installed and operated at the site <br /> from April 1996 to late June 1999 to remediate hydrocarbon-impacted soil and ground water <br /> However,over the course of the SVE remedial action,rising ground water elevation had submerged <br /> a significant portion of contaminated soil,leaving a greatlyreduced vadose zone addres sable by SVE <br /> technology and apparently rendering IAS ineffective due to a thicker saturated zone and diminished <br /> ability to recover sparged air Areas in the eastern portion of the site and at the northwest corner of <br /> the site had not demonstrated a sustained reduction of dissolved hydrocarbons Subsequently a more <br /> effective remedial system was required <br /> 837 Shaw Road,Srockton,California 95215 <br /> Telephone(209) 467-1006 FAX(209)467-1118 <br />