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RMC PACIFIC MATERIALS F <br /> . 6601 KOLL CENTER PARKWAY <br /> P O BOX 5252 _ <br /> PLEASANTON CALIFORNIA 94566 <br /> (925) 426-8787 • fax (925) 426 2281 , <br /> www rmcpacrfrc cam , r <br /> 12/5/2001 <br /> Margaret Lagorio, REHS <br /> Environmental Health Services <br /> San Joaquin County <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> RE: RMC Kerlinger Aggregate Plant—Soil Pile Investigation (Site Code 1737) <br /> 30350 South Tracy Blvd. <br /> Tracy, CA 95376 <br /> Ms Lagorio, <br /> Please find enclosed our submittal of results of analyses conducted on <br /> contaminated soil piles generated from two UST removals at our facility, the first, a <br /> 10,000-gallon diesel tank and, the second, a 10,000-gallon slow-cure asphalt tank Tank <br /> one was removed in early 1998 and number two was removed in 1999, both as per the <br /> 1998 requirement <br /> At the time of the removals the contaminated soil from each site was stockpiled <br /> on black visquine with the idea to remediate the soil on site until all of it could be <br /> disposed of at a reasonable price The material was periodically turned with a front-end <br /> loader but no analyses were undertaken between the time of excavations and this report <br /> The locations of the piles are now in the way of planned future excavation and so it was <br /> decided that we should analyze the soil to determine if more remediation was necessary <br /> (requiring relocating the piles) or if the were other possible alternatives <br /> A sampling plan was utilized on the two piles based on a plan developed and <br /> accepted by the Alameda County Department of Environmental Health at two of our <br /> other facilities within their jurisdiction This plan involved superimposing an imagined <br /> grid over each pile and excavating in locations based on generated random numbers <br /> corresponding to the X, Y and Z (depth) coordinates This resulted in a pattern that we <br /> believe to give a reasonably representative cross-section of the piles <br /> Sampling Protocol <br /> Soil samples were obtained on November 7, 2001 by a combination of powered <br /> and hand means A backhoe was directed to the computer-preselected locations and <br /> instructed to excavate to near the full pile depths (-6 feet) The sample was then collected <br />