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i <br /> l <br /> i <br /> r.. <br /> I <br /> collected from both the soil borings and monitoring wells and <br /> laboratory analyzed for benzene, toluene, ethylbenzene, total xylenes <br /> (BTEX) using EPA method 8020 and total petroleum hydrocarbons (TPH) <br /> as gasoline using modified EPA method 8015. Samples collected from t` <br /> near the used-oil tank were also analyzed for TPH as diesel using <br /> I <br /> modified EPA method 8015. Laboratory analyses of soil samples k <br /> determined that petroleum hydro .arhons are present largely near the <br /> center and on the eastern side of the former storage tank excavation. � <br /> This was confirmed by additional soil sampling performed by <br /> RESNA/WaterWork Corporation as discussed below. <br /> J <br /> 4.2 Pbase Iv Site Iavestigation E i <br /> In April of 1990, RESNA/WaterWork Corporation supervised the drilling : <br /> of 7 additional soil borings at the site, two of which were converted k <br /> E � <br /> to groundwater monitoring wells and three of which were converted to <br /> _. vapor extraction wells (Figure 5) . One soil boring was. located north f <br /> of the former tank pit excavation in Channel Street to help determine `� ! <br /> the lateral extent of soil contamination north of the site. One soil <br /> boring was angle drilled beneath the eastern dispenser island to a <br /> total depth of approximately 20 feet below grade to determine ' ' f <br /> subsurface conditions beneath the dispenser island. Two brings, one <br /> in the northeast corner and one west of the former tank pit <br /> excavation, were advanced 15 feet beyond groundwater and converted to <br /> monitoring wells to determine water quality in these areas. 4 . <br /> 4.3 Soil Sampling Orocedurea <br /> All borings were sampled at 5 =foot depth intervals using a split- <br /> spoon sampler with brass liners. The material from one sample ring y t <br /> was described in the field and logged continuously by a qualified <br /> geologist using the Unified Soil Classification System. Descriptions f <br /> of soils encountered a..d well construction details were recorded on <br /> -- - the boring/well logs (Appendix 1). The second ring was, sealed at - ----- —f- <br /> each -end with aluminum foil and a plastic cap. The eap .was then " <br /> secured with tape and the sample was placed in an air-tight bag and <br /> preserved on ice: <br /> `� Neber Point Property - 475 <br />