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M- i <br /> t• 4T#• - L� C 4 <br /> 1' <br /> Urloah 'Inco <br /> 1 <br /> S <br /> An Environmental Services Company <br /> r <br /> y, March 14, 1991 <br /> Mr. and Mrs. Abe Ayesh <br /> 578 Tara Court i.=;••ti ` <br /> Manteca, CA 95335 <br /> RE: Interim Report Concerning the Characterization and <br /> Remediation of Fuel Hydrocarbon Contaminated soils at the <br /> Collegeville Market and <br /> deCafe, <br /> 1 5521 East Mariposa Road, <br /> Stockton, CA. Site <br /> Pear Mr. and Mrs. Ayesh: <br /> On February 7, 1991 , Uriah Inc. staff geologist Kevin McNamara <br /> and Mr. Al Williamson of AAA Tank Removal Service undertook <br /> the excavation of gasoline contaminated soils in the area shown <br /> on Figure 02, attached. . . <br /> a site formerly occupied by one 250 <br /> gallon underground fuel storage tank. The excavation process <br /> was intended to complete the definition of the extent of fuel <br /> hydrocarbon contamination in soil and concurrently effect <br /> remediation in accordance with requirements set forth by the <br /> Environmental Health Division of the County of San Joaquin <br /> Department of Public Health Services (PHS/EHE) and guidelines <br /> promulgated by the Central Valley Regional Water Quality Control <br /> Board (RWQCB) . <br /> HYDROGEOLOGIC OVERVIEW <br /> The Collegeville Market and Cafe site is located within the <br /> Central Valley of California at an elevation of59tely100afeet^below <br /> sea level; with groundwater located app <br /> ground surface (bgs) . The soils encountered during excavation <br /> activities at the site consisted of sands and silts which are <br /> a Sart of the Plio-Pleistocene Victor Formation. An organic <br /> rich sandy clay was exposed at the surface with fine to medium <br /> grained sand beneath at 4.5 feet bgs. . .continuing down to 26 <br /> ---.----— _._.feet._.bgs._.(the...-maximum depth excavated) . A calcium cemented <br /> silty sand <br /> "hardpan") was noted at- 10_ feet--bgs. <br /> 1 . <br /> 464 Lindbergh Avenue <br /> • Livermore, California 94550 (415) 455-4991 <br />