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CRYSTAL CREAMERY - STOCKTON <br /> 4 le WKA No 1628 01 <br /> March 17, 1994 <br /> Page 2 <br /> The site is mostly paved with asphalt A building occupied by American Protective Services is <br /> located in the northern portion of the site The Crystal Creamery refrigerated warehouse with <br /> loading dock is Iocated in the southern portion of the site The former underground tank was <br /> located between the two buildings as shown on Plate 2 <br /> Mr Steve Jerkins of Crystal Creamery was interviewed by telephone on April 29, 1991 <br /> regarding historical information on the underground storage tank previously removed from the <br /> site He indicated no specific knowledge of existing records of tank maintenance, leaks, spills or <br /> accidents He also indicated that he had no personal knowledge of fill or use records <br /> Project History <br /> The following Information was obtained during a review of files located at the San Joaquin <br /> County Environmental Health Department Excavation soil samples, boring and well locations <br /> are provided on Plate 3, laboratory results are summarized in Table 1 <br /> On September 3, 1986, one 10,000-gallon regular unleaded gasoline storage tank was <br /> removed from the site Test results of soil samples (#1, #2, and #3), collected from <br /> beneath the tank by Michael Ramos immediately following the tank removal, revealed <br /> total petroleum hydrocarbon (TPH) as gasoline concentrations ranging from <20 mg/kg <br /> to 3,600 mg/kg <br /> On October 29, 1986, Applied GeoSystems (AGS) drilled and sampled two soil borings <br /> Boring B1 was advanced to 21 5 feet below grade, ground water was encountered at 16 3 <br /> feet below grade during drilling Boring 132, which was subsequently converted to <br /> monitoring well MW I, was advanced to 38 5 feet below grade, ground water was <br /> reportedly encountered at 18 feet below grade during drilling One 15-foot soil sample <br /> from each boring was tested and revealed TPH-gasoline concentrations of 0 2 mg/kg in <br /> the sample from boring B1 and 28 6 mg/kg in the sample from boring B2/MW1 1n <br /> addition to the borings, AGS deepened the existing excavation and obtained soil samples <br /> YVALLACE KUHL <br /> k I G s paps D ASSOCIATES INC <br />