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EXECUTIVE SUMMARY <br /> ATEC Environmental Consultants (ATEC) has completed a Level II Environmental Site <br /> Assessment at a property located at 415 Main Street, Manteca, California. The purpose of the <br /> assessment was to determine whether the site has been impacted by the former presence of <br /> underground storage tanks (USTs) on the site, or by nearby properties where leaking USTs have <br /> been identified. The scope of work consisted of the drilling of four soil borings on the property, <br /> the collection of soil samples and groundwater samples using a HydroPunch, and chemical <br /> analysis of the samples. File research on three neighboring properties and the subject site was <br /> also performed. <br /> Analysis of four soil and four groundwater samples collected during the subsurface investigation <br /> did not reveal detectable levels of gasoline or benzene-toluene-ethylbenzene-xylenes (BTEX) in <br /> either the soil or the groundwater. Low levels of total recoverable petroleum hydrocarbons <br /> (TRPH) were detected in each of the four soil samples analyzed, but TRPH was not detected in <br /> the groundwater. The highest level of TRPH detected was 110 parts per million at a depth of <br /> 15 feet in a boring near the northeast corner of the site. <br /> Records research indicates that three nearby properties with known leaking underground storage <br /> tanks do not appear to pose an immediate concern to the subject site. Records at the City of <br /> Manteca Fire Department indicate that soil contamination was evident when underground storage <br /> tanks wre removed from the subject site circa 1978; file information on the disposal or <br /> remediation of the soil was not available. The methods recommended by the Fire Department <br /> and Public Works Department for soil disposal in 1979 might have adversely impacted the <br /> subject site, but whether the recommendations were followed is not known. <br /> ATEC recommends that individuals who might have knowledge of the tank removal and soil <br /> disposal be contacted in order to determine the disposal of the contaminated soil. Such <br /> individuals include the contractor who built the present building, and the then-current Fire Chief <br /> and Chief Building inspector. <br /> Based on the non-detectable levels of gasoline and gasoline constituents identified in the present <br /> study, and pending the results of the interviews recommended above, ATEC recommends that <br /> no further subsurface investigation be conducted on the subject site. <br /> i <br />