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FLUOR DANIEL GTI <br /> April 21, 1998 <br /> Mr. Harlin Knoll <br /> San Joaquin County Public Health Services <br /> P.O. Box 388, 304 East Weber Avenue <br /> Stockton, California 95201-388 <br /> Subject: Southland Facility#20304 <br /> 455 Grant Line Road <br /> Tracy, California <br /> FDGTI Project Number 102480 <br /> Mr Knoll: <br /> The purpose of this letter is to describe proposed well destruction procedures for three groundwater <br /> monitoring wells(MW-8,MW-9, and MW-10) and one groundwater extraction well (GWE-3) at the subject <br /> site (See attached site map). The wells will be destroyed as part of the proposed soil excavation as <br /> described in Fluor Daniel GTI's Remedial Action Plan for Soil Excavation dated January 26, 1998. The <br /> wells be destroyed in accordance with State of California Water Well Standards, Bulletin 74-90, Section 16 <br /> for destruction of monitoring wells, and in accordance with San Joaquin County Public Health Services <br /> requirements. <br /> The three wells groundwater monitoring wells(MW-8, MW-9,and MW-10)are constructed of 4-inch- <br /> diameter PVC casing with a total depth of 8 to 10.5 feet below ground surface (BGS). One well <br /> groundwater extraction well (GWE-3) is constructed of 6-inch-diameter PVC casing with a total depth of 19 <br /> feet BGS. Well MW-8 is screened from 5 to 10.5 feet BGS. Wells MW-9 and MWA 0 are screened from 2 <br /> to 8 feet BGS. Well GWE-3 is screened from 4 to 14 feet BGS with blank casing installed to 19 feet BGS. <br /> The wells will be destroyed by pressure grouting. The well casings will be grouted with Portland cement <br /> using a 1-inch diameter tremie pipe. Following placement of the grout inside the well casing, approximately <br /> 30 psi of air pressure will be applied to the top of each casing using an air compressor. Air pressure will be <br /> applied at 5 minute intervals until there is no noticeable drop in grout inside the casing. The top 5 feet of <br /> casing will be removed during the proposed soil excavation. <br /> If there are any questions regarding this request, please feel free to call me at our Martinez office at(510) <br /> 370-3990. <br /> Sincerely, <br /> Fluor Daniel GTI, Inc. <br /> 9��� <br /> a o cit_ <br /> David Bean <br /> Staff Geologist <br /> 757 Arnold Drive, Suite D /Martinez, CA 94553 USA (510) 370-3990 FAX(510) 370-3991 <br />