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KLEINFELDER f <br /> May 2, 1988 <br /> File: 24-2084-01 <br /> Mr. Bob Sagaser <br /> City of Tracy <br /> 3900 Holly Drive C�`` 6 <br /> Tracy, California 95376 <br /> Dear Mr. Sagaser: <br /> Kleinfelder's Environmental Division in Sacramento is requesting <br /> authorization to release ground water containing very low concentrations <br /> of petroleum hydrocarbons into the Sanitary Sewage System of the City of <br /> Tracy, California. Laboratory analysis indicates total petroleum <br /> hydrocarbon concentrations of 1.5 ppm in the water. The water to be <br /> discharged is contained in an open tank excavation at Food & Liquor Store <br /> #37, at 15 East Grantline Road, Tracy, California. <br /> Kleinf elder was retained by - The Customer Company to provide onsite <br /> environmental guidance during, the removal of 2 underground fuel tanks, 'and <br /> subsequent additional soil and ground water assessments. Food & Liquor <br /> Stores in California are owned by The Customer Company in Benicia, <br /> California. <br /> During the removal of the two underground fuel tanks, (leaded and regular <br /> gasoline) a pit approximately 12 feet deep was created. Ground water was <br /> encountered approximately 6 feet below. ground surface. <br /> On April 20, 1988, a water sample was collected from the excavation.and <br /> submitted, under chain-of-custody, to Chemwest Analytical Laboratories, <br /> Inc. of Sacramento, California. The water sample was analyzed for total <br /> petroleum hydrocarbons by GC-FID and benzene, toluene, ethylbenzene, 'and <br /> xylene (BTEX) by EPA Method 602. Results of the GC-FID analysis indicated <br /> a petroleum hydrocarbon concentration of 1,500 ug/L or 1 .5 part per <br /> million (ppm) . The BTEX results were below the laboratory's reporting <br /> limits for all constituents. A copy of the chain-of-custody and <br /> laboratory data sheets are enclosed. <br /> The installation of new underground storage tanks will require the removal <br /> of water from the excavation. The water will be pumped directly from the <br /> excavation to the city sewer system. The number of gallons to be removed <br /> is not known, but the excavation will be pumped continually to dewater the <br /> excavation. Kleinfelder estimates the removal of 5,000 to 15,000 gallons <br /> at a rate of approximately 10 gallons a minute. We anticipate initiation <br /> of the work on May 9, 1988, and the pumping will continue one to two days. <br /> KLEINFELDER 9795 Business Park Drive, Suite C, Sacramento, CA 95827 (916) 366-1701 <br />