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Site Background Information Larry's Auto <br /> Page 8 of 8 <br /> distribution of the contaminants in the subsurface as described below <br /> iThe transportation of the migrating hydrocarbons originated at the former UST areas One UST was <br /> located near the northwestern edge of the parking lot at the site and an additional set of tanks were <br />' located on the southern sidewalk of the site The former UST dispenser area was above to each of <br /> the UST system, thus the release locations were generally centralized to the UST locations The <br /> release occurred separately at each UST set, the northern and the southern area, and then migrated <br />' vertically to a depth likely near 60 feet bsg,based on soil impact Free product was encountered in <br /> MW-4 and removed The hydrocarbons dissolved at a depth near 50 feet bsg, that created a <br /> significant smear zone or possible a highly-saturated hydrocarbon impacted soil, as depicted in water <br /> samples collected from boring VW5 <br /> The dissolved hydrocarbons laterally migrated east and mostly east through Hydrogeologic Units <br /> 1 and 2(between 27 feet and 65 feet bsg) The impact observed at well MW-I and VW-4 represents <br /> the leading edge of the dissolved hydrocarbon plume The vertical extent of impacted dissolved <br /> hydrocarbons requires well installed within multiple hydrogeologic units, with previous impact to c <br />' Shallow ground water data gaps off- <br /> site are east of well MW-1,east of well MW-4 and south of well <br /> lieMW-4 for the southern plume (south UST), north of the site CPT samples have aided in the <br /> definition of the plume The vertical and lateral extents of contaminated soil and ground water have <br /> not been defined at the site <br /> 1 <br /> I <br /> r <br /> 0 <br /> Advanced GeoEnvironmental,ine <br />