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McDowell&Davis Towing <br /> vest ation <br /> Vertical Soil Contamination In <br /> M. J. Kloberdanz & Associates constructed four soil borings to depths of 20 to 45 feet <br /> in the vicinity of the former underground tanks and fuel islands. Boring B-1 was <br /> drilled next to the former tank excavation to a depth of 40 feet. <br /> collected from various depths including the bottom of this boring were reported as <br /> "non-detect for the compounds analyzed"by the analytical laboratory. <br /> Boring B-2 was drilled to a depth of 45 feet in the fuel island area, near grab sample <br /> PL# 7, where soil contamination was detected during the tank removal. Petroleum <br /> contamination was apparent to a depth of 20 feet in the boring. <br /> Boring B-3 was drilled to 20 feet southeast of boring B-2 between the two fuel <br /> islands. Laboratory soil samples, collected at 15 and 20 feet in depth, were reported <br /> as "non-detect for the compounds analyzed"by the analytical laboratory. <br /> Boring B-4 was drilled to 20 feet in depth northeast of boring B-2. Laboratory soil <br /> samples, collected at 15 and 20 feet, were reported as "non-detect for the compounds <br /> analyzed"by the analytical laboratory. <br /> Three groundwater-monitoring wells were installed to a depth of 70 feet November <br /> 11, 2000 to define the direction and magnitude of groundwater flow and recognize <br /> possible groundwater impacts from the releases. Soil samples, collected from the <br /> lower portions of the borings did not contained detectable concentrations of analyzed <br /> contaminants <br /> TeA <br /> five quarters of groundwater monitoring has been conducted at McDowell and Davis. <br /> Laboratory analyses of the May 2002 monitoring event (report in preparation) <br /> detected a maximum of 1.1 ug/l MTBE and .6-ug/l toluene in the groundwater <br /> samples. Laboratory analyses of groundwater samples collected during the <br /> monitoring events are presented in Table I. <br /> Potable drinking water is supplied by the City of Escalon municipal water system. <br /> The closest municipal well is located approximately 1000 feet to the south-southwest <br /> of the site. The nearest water well identified in the well survey is the Escalon Unified <br /> School District well at 1500 east Yosemite Blvd., approximately 750 feet northeast of <br /> the site. <br /> 2.0 WORK PLAN <br /> M. J. Kloberdanz & Associates proposes to drill a single boring with a Geoprobe to a <br /> depth of about 30 feet in the area of former boring B-2 (Figure 2). Soil samples will be <br /> collected every five feet for laboratory analysis. Samples will be analyzed by <br /> GeoAnalytical Laboratories for gasoline BTEX, & MTBE. Any samples positive for <br /> MTBE will be analyzed for the Oxygenated Compounds using Method 8260. <br /> 2 <br />