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t:�'ii O HEALTH <br /> ��itTRi,Jr�iflLiti,'�L <br /> 0�140111GROUNDWATER l'= �; t1T ._RV.1CE <br /> 9,0 JUN 14 Ptd I: 4 <br /> TECHNOLOGY, INC. 4057 Port Chicago Highway,Concord,CA 94720(415)671-2387 <br /> FAX:(415)685-9148 <br /> June 7, 1993 <br /> Project No. 020203767 <br /> Mr. Bob Vasquez <br /> The Southland Corporation <br /> 5820 Stoneridge Mall Road, Suite 310 <br /> Pleasanton, California <br /> SUBJECT: Extraction Well Installation Report <br /> Southland Site No. 20304 <br /> 455 Grant Line Road <br /> Tracy, California <br /> Dear Mr. Vasquez: <br /> This Extraction Well Installation Resummarizes the results of the extraction well installation at <br /> the subject site as proposed in our Work Plan for Groundwater Extraction Well Installation, dated <br /> March 15, 1993. The scope of work consisted of installing one 8-inch-diameter extraction wells (Well <br /> . GWE-1) to a depth of 30 feet. This well will be used to gain hydraulic control (containment) of the <br /> Identified dissolved petroleum hydrocarbon plume through groundwater extraction and treatment. <br /> The site location is Illustrated in Figure 1 (Attachment 1). The well location is presented on the site <br /> plan (Figure 2). <br /> The well was.installed in accordance with San Joaquin County Public Health Services, Environmental <br /> Health Division (SJCPHS/EHD) Well Permit Number 93-0816. A copy of the permit is attached <br /> (Attachment 2). West Hazmat Drilling Corporation, a California licensed drilling company, began <br /> Installation of the well on May 7, 1993, under the supervision of a Groundwater Technology <br /> geologist. <br /> On May 7, 1993, a boring was continuously cored to a total depth of 30 feet using a drill rig <br /> equipped with 7.25-inch-diameter hollow-stem augers. The Groundwater Technology geologist <br /> logged the boring in accordance with the Unified Soil Classification System. The soll core was <br /> screened with a photoionization detector (PID) to measure relative concentrations of volatile organic <br /> compounds in the soil. Two soil samples were selected and analyzed for total petroleum <br /> hydrocarbons as gasoline (TPH-G) and benzene, toluene, ethylbenzene, and xylenes (BTEX). Also, <br /> one soil sample was selected and submitted for a sieve analysis to provide data for future well <br /> screen and filter pack design. Following the completion of drilling and sampling, the boring was <br /> filled with a bentonite and cement ut. Before backfilling the boring, the Groundwater Technology <br /> 37678023.020 <br /> Offices throughout the 1�.5.,Canada and Overseas <br />