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f <br /> 3 3 GRAB GROUNDWATER SAMPLE ANALYTICAL RESULTS <br /> Groundwater samples SB3 W through SB7W were collected on 26 and 27 August 1999 and <br /> analyzed for BTEX using EPA Method 8020 Modified, and TPH-g using EPA Method 8015 <br /> Modified In addition, oxygenates (tert-amyl methyl ether, tert-butyl alcohol, di-isopropyl ether, <br /> ethanol, ethyl t-butyl ether, methanol, and methyl t-butyl ether), EDB, and 1,2-DCA were analyzed <br /> ' for using EPA Method 8260B Grab groundwater sample analytical results are summarized in <br /> Table 4, and a copy of the laboratory analytical report and chain-of-custody documentation is <br /> included in Appendix E <br /> ' MTBE was detected in groundwater samples SB3W, SB4W, and SB7W at 4 89, 10 6, and 19 6 <br /> µg/L, respectively TPH-g was detected in groundwater sample SB7W at 3,930 gg/L Benzene <br /> and methanol were not detected above laboratory reporting Iimits in any of the groundwater <br /> samples Figure 9 presents the analytical results for the groundwater grab samples collected on 26 <br /> and 27 August 1999 <br /> 3.4 SUMMARY OF RESULTS OF CONFIRMATION SOIL BORINGS <br /> A total of five confirmatory soil borings were drilled Soil borings SB4-SB7 were dulled within <br /> the former UST basin to quantify the success of the remedial efforts in the former UST basin <br /> which was the primary source of petroleum hydrocarbons Soil boring SB3 was drilled to assess <br /> the presence of hydrocarbons in the southeast comer of the property <br /> f Of the 20 soil samples collected during this field effort, oxygenates and benzene were not <br /> detected at or above reported detection limits with the exception of 3 81 mg/kg benzene in <br /> sample SB-5 at 36 feet bgs TPH-g was detected in three of the 20 samples collected, at <br /> concentrations ranging from 0 501 to 14,300 mg/kg in soil borings SB5-SB7 <br /> Benzene was not detected in the any of the grab groundwater samples collected from these five <br /> borings Of the oxygenates, MTBE was detected in three of the five samples at concentrations <br /> ranging from 4 89 to 19 6 t g/L TPH-g was detected in one of the five grab groundwater <br /> samples (SB7W), at 3,930 pg/L <br /> i <br /> 1 <br /> F 1P10 Ws170137Waster\Wp\(losuieI IOOt0137citext doc 8 <br />