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i <br /> •r + <br /> Advanced <br /> i GeoEnviro m # ,ental sInc o <br /> 25 August 1999 <br /> AGE-NC Project No 97-0343 <br /> Ms Lori Duncan <br /> SAN JOAQUIN COUNTY PHS-EHD <br /> 304 East Weber A-,enue, 3' Floor <br /> Stockton, CA 95202 <br /> Subject: Work Plan Addendum - August 1999 <br /> Former FISCO WAREHOUSE (Howard Lenz Property) <br /> 1648 Shaw Road, Stockton, California <br /> Dear Ms Duncan <br /> At the request of Mr Peter Lenz, and in accordance with your letter dated 26 May 1999,Advanced <br /> • GeoEnvironmental, Inc (AGE)has prepared this addendum to the Site Assessment Work P1017-Alav <br /> 1999 for additional investigation of the former underground storage tank(UST) area located at 1648 <br /> Shaw Road, Stockton, California Site background and previous investigation are summarized in the <br /> Preliminary Site Investigation Report, dated 30 December 1997 and prepared by AGE <br /> SCOPE OF WORK <br /> At the request of the PHS-EHD, three wells will be installed at the site Each well will be dual- <br /> completed as ground water monitoring/soil vapor extraction wells with screened intervals from <br /> approximately 55 to 35 feet bsg and from 28 to 13 feet bsg Approximately two feet of bentonite will <br /> be placed above the lower sand pack and hydrated Portland cement will then be used for the annular <br /> seal between the screened intervals The remaining well construction details were described in the <br /> Site Assessment Work Plan-May 1999,prepared by AGE A minimum of one additional boring will <br /> be advanced north of the former UST location utilizing methods described in the referenced work <br /> plan Proposed well and boring locations are illustrated on Figure 2 <br /> Soil boring advancement, soil and ground water sampling and analysis, equipment decontamination, <br /> well completion and development, boring abandonment procedures were described in the Site <br /> Assessment Work Plan - May 1999 <br /> i <br /> 3315 E Miraloma Avenue, Suite 117,Anaheim,California 92806 <br /> Telephone(714)996-5151 FAX(714)996-5182 <br />