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1 2 2 Prehminary Investigation and Evaluation <br /> On January 5 and 6, 1999, Ramage Environmental conducted a preliminary investigation and <br /> evaluation, which included the drilling of five on-site soil borings for soil sampling and analysis <br />' Three of the sod borings were converted to groundwater monitoring wells The on-site soil boring <br /> and monitoring well locations are shown on Figure 2 The results are documented in Ramage <br /> Environmental's Preliminary Investigation and Evaluation Report, dated February 23, 1999 <br /> A metal detection survey conducted at the site, on January 13, 1999, discovered strong metallic <br /> signals in the vicinity of the former UST excavation The metal may be drums of waste not <br /> accounted for from earlier site investigation activities and other material used to backfill the former <br /> UST excavation <br /> r <br /> In sod, the highest concentrations of gasoline hydrocarbons were detected in the sample collected <br /> at 30 feet bgs from the soil boring for MW-2 This sample, collected directly beneath the former <br /> UST excavation, contained 2,400 mg/kg of TPH-as-gasoline and detectable concentrations of <br /> toluene, ethylbenzene and xylenes Laterally, the extent of impacted soil appeared to be limited to <br /> the footprint of the former UST excavation <br /> The depth to groundwater beneath the site ranged from 39 31 to 40 34 feet bgs Groundwater <br /> flow was to the south-southeast at a gradient of 0 05 foot/foot The well construction details and <br /> groundwater monitoring data are summarized in Table 1 Concentrations of TPH-as-gasoline and <br /> BTEX compounds were detected in the groundwater samples collected from MW-2 and MW-3 <br /> The groundwater sample collected from MW-1 did not contain detectable concentrations of any <br /> gasoline compounds As such, the lateral extent of impacted groundwater was undefined to the <br /> north (upgradient), west and south (downgradient) of the former UST excavation However, the <br /> lateral extent was defined to the northeast by MW-1 The groundwater analytical data are <br /> summarized in Table 2 <br /> 1 2 3 Cone Penetration Testing and Discrete Groundwater Sampling <br /> On April 25, 2000, to evaluate the vertical extent of impacted soil and groundwater, Gregg Drilling <br /> and Testing, Inc (Gregg), a state licensed drilling contractor (C-57#656407), advanced one on- <br /> site cone penetration test (CPT) boring and collected discrete soil and groundwater samples at <br /> ' one on-site location <br /> 4 <br />