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� v <br /> 0 <br /> A S S O C I A T E S I N C <br /> contaminant transport observed from laboratory analytical data, the gradient appears to be towards <br /> the west-southwest <br /> ' 3.0 BACKGROUND <br /> ' 3.1 UST Removal <br /> ' The site was occupied by a gasoline service station from the late 1930s to December 30, 1990 <br /> Since 1941, two brothers, Russell and Charles Chapin (Chapin Brothers), subleased the property <br /> and all improvements including the product storage tanks from the Shell Oil Company (Shell) <br /> Originally, three underground storage tanks (USTs) were present on the property Additional <br /> tanks were installed at the site between 1941 and 1975 In 1963, a Ieaky 8,000-gallon UST was <br /> replaced In 1972, one 8,000-gallon UST was replaced by Shell <br /> In August 1993, one 550-gallon waste oil UST, two 4,000-gallon gasoline USTs and two 8,000- <br /> gallon gasoline USTs were removed from the north central portion of the site During removal, <br /> ' three additional 1,000-gallon USTs were discovered near the western portion of the site and <br /> removed These tanks were previously filled with sand and apparently abandoned in place Soil <br /> samples collected at the time of the tank removals indicated the presence of petroleum <br /> hydrocarbon impacted soil at the site <br /> The site is currently occupied by a single "L" shaped building which houses the auto repair <br /> ' business The building is surrounded on the north and west by an asphalt paved parking area <br /> 3.2 Subsurface Investigation <br /> ' Initial Site Investigation <br /> ' Due to the suspected releases of petroleum hydrocarbons during previous site operations, in <br /> December 1990, one groundwater monitoring well (MW1) was installed at the site, north of the <br /> former UST location on the eastern portion of the site This well was installed prior to the <br /> removal of the USTs at the site <br /> ' Laboratory analytical data from soil samples collected during the installation of MW1 indicated <br /> that petroleum hydrocarbon impacted soil was present at the site and laboratory data from a <br /> groundwater sample from the well indicated that total petroleum hydrocarbons as gasoline <br /> ' (TPHg) and benzene, toluene, ethylbenzene and total xylene (BTEX) were present in <br /> groundwater at the site <br /> ' Assessment of Hydrocarbon Impacted Soil and Groundwater <br /> In December 1993, Science Engineering Analysis Corporation (SEACOR) advanced four soil <br /> borings at the site Borings B2, B3, B4, and B5 were completed as groundwater monitoring wells <br /> w 1271421rcpoMMosure doc 2 <br /> II <br /> I <br />