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' 08 September 1999 <br /> p , <br /> AGE-NC Project No 95-0103 <br /> ' Page 6 of 9 <br /> t3 3 HYDROCARBON-IMPACTED GROUND WATER <br /> A total of nine grab water samples collected at the site Six grab water samples were analyzed by <br /> LOnSite and three additional grab water sample were analyzed by MAI <br /> • TPH-g was detected in four of the grab ground water samples collected from the site at <br /> concentrations up to 22,000 microgram per liter (µg11) The greatest concentration of <br /> hydrocarbons as gasoline were detected at the location of CHP5 and toward the west to the <br /> 1 location of C133 <br /> • Benzene was detected in four of the water samples analyzed at concentrations ranging from <br /> 1 2 ,ug/I in boring CHP6 to 150 ug/I in boring CHP5 The most significant concentrations <br /> ' of toluene, ethylbenzene and xylene were also detected in the water sample collected from <br /> CHP5 <br /> ' • MTBE was detected in three of the grab water samples analyzed at concentrations ranging <br /> from 2 3 ug/I in boring CHP7 to l I ugll in boring CHP5 TBA was detected in the grab <br /> water sample from boring CHP5 at a concentration of 67 ug/l While DIPE was detected in <br /> '! six of the grab water samples analyzed at concentrations ranging from 1 3 ug/l in boring <br /> CHP7 to 150 pg/l in boring CHP1 <br /> ' TPH-g was detected in samples from monitoring well samples MW-1, MW-3,MW-5,MW-4 <br /> and vapor well VE-1 at concentrations of 410 µg11, 4,600 µg11, 800 ug/l, 4,000 µg/1 and <br /> 1,100 ug/l, respectively <br /> ' Benzene was detected in ground water samples collected from wells MW-1, MW-3, MW-4 <br /> MW-5 and vapor well VE-1 at concentrations of 5 9 ug/l, 76 ug/I 740 ug/l, 19 µg11 and 9 2 <br /> ' µg11, respectively Other BTEX compounds were detected in the well samples at <br /> concentrations up to 480 ug/l <br /> • MTBE was detected in the samples collected from wells MW-1, MW-3 and MW-4 at <br /> 1 concentrations of 4 4 ug/l, 1 7 ,ug/l and 3 lug/l, DIPE was detected in samples collected <br /> from wells MW-3, MW-4 and MW-5 at concentrations of 20 pg/1, l 2 µg/l and 9 2 ,ug/l, <br /> ' respectively TBA was detected in samples collected from wells MW-I, MW-3, MW-5 and <br /> vapor well VE-I at concentrations of 18 ug/l, 16 ug/l, I 1 µgll and 56,µg/1, respectively <br /> • ETBE and TAME were not detected in samples collected from tine site <br /> ' • Figure 6 depicts an approximate areal distribution of ground watei containing benzene <br /> Laboratory results of grab ground water samples analyzed for petroleum hydrocarbons are <br /> ' summarized in Tables 4 and 5 The laboratory reports (OnSite Laboratory ID 1 FO18-01 to 1 FO 18-22 <br /> • and I FO 1901-02 and MAI Laboratory ID 15652 through 15654), QA/QC reports and chain-of- <br /> ' AdtiaucedGeoEn+ironmcntal,Inc <br />