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' 15 June 1999 <br /> . AGE-NC Project No 98-0450 <br /> ' Page 2 of 27 <br /> ' 22 PREVIOUS INVESTIGATIONS <br /> Information regarding previous investigations conducted at the site was obtained from the <br /> ' Preliminary Site Assessment Report,dated October 11, 1995,prepared by the Clearwater Group,Inc <br /> In July 1995 two ground water monitoring wells were installed at the site The wells were sampled <br /> five tunes between 1995 and May 1998 The greatest concentration of total petioleum hydrocarbons <br /> as gasoline(TPH-g)and benzene,toluene,ethylbenzene,and total xylenes (BTEX)compounds were <br /> detected during the May 1998 quarterly ground water monitoring event TPH-g was detected at <br /> 12,000 micrograms per liter (ug/l) and BTEX compounds were detected at concentrations up to <br /> 1,900µg/l (xylene) <br /> ' 23 UST REMOVAL <br /> In February 1998, three USTs and associated product distribution system were removed from the <br /> site Details of the UST removals and soil sampling were presented in reports by Thorp Oil to the <br /> PHS-EHD <br /> aHydrocarbons in soil were detected in the area of the former USTs The hydrocarbon-impacted soil <br /> was limited to the northern portion of the UST-removal area at a depth of 15 feet below surface <br /> grade (bsg) and the western edges of the dispensei islands at a depth of 5 feet bsg The analytical <br /> results of UST soil samples are summarized in Table I <br /> ' 24 ADDITIONAL SITE ASSESSMENT <br /> On 28, 29 and 30 October 1998, three ground water monitoring wells, two soil gas/vapor wells and <br /> four soil borings were installed on-site <br /> ' Soil boring BMW3 was completed as ground water monitoring well BMW3 at the northwest edge <br /> of the site Soil boring S134 was completed as ground water monitoring well BMW4 in the center <br /> ' of the former UST area Soil boring BMW5 was completed as ground water monitoring well BMW5 <br /> at the eastern edge of the site Soil borings S135 and SB6 were advanced at the approximate ends of <br /> the former northern dispenser island and completed as soil gas/vapor extraction/monitoring wells <br /> VW 1 and V W2,respectively Additionally, soil boring SB 1 was established at the northwestern edge <br /> of the former UST excavation to determine if soil contamination extended laterally north of the <br /> former UST area Soil borings S132 and SB3 were advanced at a 35' angle from vertical under the <br /> property noith of the site, to determine the lateral extent of the hydrocarbon impact to soil and <br /> � ground water Soil boring SB7 was established at the approximate west end of the former southein <br />' dispenser island <br /> Advanced GeoEmiroamentaI,Inc <br />