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.. .PW <br /> Site Background Information: Larry's Auto <br /> AGE-NC Project No. 95-0184 <br /> Page 8 of 8 <br /> also is undefined at the former diesel fuel UST location along Miner Avenue. <br /> • Two soil samples were collected for laboratory analysis, one at 60 feet bsg <br /> (HU1/HU2 boundary) in CPT-7 and at 155 feet bsg (HU6) in CPT-8. No petroleum <br /> hydrocarbons were detected at or above laboratory reporting limits. <br /> Based on the data collected to date from CPT borings, soil borings and ground water <br /> monitoring wells, AGE has developed a preliminary site conceptual model for the release, <br /> migration and distribution of the contaminants in the subsurface as described below. <br /> The transportation of the migrating hydrocarbons originated at the former UST areas. One <br /> UST was located nearthe northwestern edge of the parking lot at the site and an additional <br /> set of tanks were located on the southern sidewalk of the site. The former UST dispenser <br /> area was above to each of the UST system, thus the release locations were generally <br /> centralized to the UST locations. The release occurred separately at each UST set, the <br /> northern and the southern area, and then migrated vertically to a depth likely near 60 feet <br /> bsg, based on soil impact. Free product was encountered in MW-4 and removed. The <br /> hydrocarbons dissolved at a depth near 50 feet bsg, that created a significant smear zone <br /> or possible a highly-saturated hydrocarbon impacted soil, as depicted in water samples <br /> collected from boring VW5. <br /> The dissolved hydrocarbons laterally migrated east and mostly east through Hydrogeologic <br /> Units 1 and 2 (between 27 feet and 65 feet bsg). The impact observed at well MW-1 and <br /> VW-4 represents the leading edge of the dissolved hydrocarbon plume.The vertical extent <br /> of impacted dissolved hydrocarbons requires well installed within multiple hydrogeologic <br /> units. <br /> The vertical and lateral extent of contaminated soil and ground water have not been <br /> completely defined at the site and mostly off-site. <br /> Advanced Geo Environmental,Inc <br />