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{ <br /> lit Site Background and Previous Work <br /> `' On October 15, 1986, two 500-gallon gasoline underground storage tanks (USTs) were <br /> removed from the site. During removal of the USTs, petroleum product was noted present in <br /> the southern UST excavation (Figure 2). Soil samples were collected from 2 feet below the <br /> bottom of the USTs, and petroleum constituents and lead were detected in the soil samples. <br /> Lo <br /> On July 18, 1995, Smith Technology supervised the installation of three groundwater <br /> monitoring wells, MW-1, MW-2, and MW-3 (Figure 2). During installation of the <br /> monitoring wells, soil samples were collected from the borings. On July 21, 1995, Smith <br /> Technology developed and sampled monitoring wells MW-1, MW-2 and MW-3. Analytical <br /> '' results of the soil and groundwater samples collected indicated elevated concentrations of <br /> petroleum hydrocarbons were present in the soil and groundwater downgradient of the former <br /> �.. gasoline UST locations (Tables i and 2). <br /> Based upon groundwater measurements from ongoing monitoring, groundwater flow direction <br /> was determined to be to the northwest. <br /> 2.0 METHODS AND PROCEDURES <br /> ` 2_1 Objective and Technical Approach <br /> The previous investigation indicated that the soil and groundwater beneath the site has been <br /> impacted by the former USTs. The limit of petroleum hydrocarbons in soil and groundwater <br /> extended beyond the area of investigation. The purpose of the additional subsurface <br /> investigation was to delineate the horizontal and vertical extent of petroleum hydrocarbon <br /> contamination present in the soil and groundwater on-site in the vicinity of and downgradient <br /> from the locations of the former gasoline USTs. In addition, the investigation was to provide <br /> soil data for determining remediation alternatives, specifically natural attenuation. <br /> V <br /> All drilling activities were performed under the supervision of a Smith Technology field <br /> geologist. All site work was performed in accordance with the field methods and Site Safety <br /> and Health Plan included in Smith Environmental Technologies Corporation's "Workplan for <br /> L,. Site Investigation" (June 23, 1995). <br /> r <br /> t <br /> w:1951221Plumerpt 2 <br /> 4 <br /> • <br /> SMTN <br />