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On April 8, May 12, May 31 and June 29, 2005, ATC personnel collected water samples from the
<br /> groundwater treatment and discharge component of the vapor extraction system Water samples were
<br /> collected from the system influent, system effluent, and vessel 1 (1 e , the effluent of vessel 1 which is in
<br /> between canisters) of the groundwater treatment system and transported under chain-of-custody
<br /> ' documentation to Argon Labs for analyses The water samples were analyzed for TPHg by EPA Method
<br /> 8415B, BTEX by EPA Method 8021B, and MTBE, TAME, ETBE, DIPE, TBA, 1,2-DCA, and EDB by
<br /> EPA Method 8260B
<br /> Vapor Analytical Results
<br /> ' Influent and effluent vapor samples were collected from the vapor extraction system during the second
<br /> quarter 2005 on April 8,May 12,and June 29,2005
<br /> ' Gross range organics (C6-C12), the TPHg equivalent, were detected in the influent vapor sample collected
<br /> on April 8,2005 at a concentration of 130 parts per million by volume(ppmv) Benzene was detected in the
<br /> influent vapor samples collected on April 8 and June 29, 2005 at concentrations of 0 5 ppmv and 0 12 ppmv,
<br /> respectively Toluene was detected in the influent vapor samples collected on April 8 and June 29, 2005 at
<br /> concentrations of 10 ppmv and 0 094 ppmv,respectively Ethylbenzene was detected in the influent vapor
<br /> samples collected on April 8 and June 29,2005 at concentrations of 18 ppmv and 0 059 ppmv,respectively
<br /> Total xylenes were detected in the influent vapor samples collected on April 8 and June 29, 2005 at
<br /> concentrations of 3 4 ppmv and 0 52 ppmv, respectively None of the analytes of interest were detected in
<br /> the influent vapor sample collected on May 12,2005
<br /> ' MTBE, TBA, TAME, ETBE, DIPE, 1,2-DCA, and EDB were not detected in the influent vapor samples
<br /> collected on April 8,May 12,2005 and June 29, 2005
<br /> NGross range organics, toluene, ethylbenzene, and total xylenes were detected to the effluent samples on
<br /> April 8, 2005 at concentrations of 3 5 ppmv, 0 074 ppmv, 0 063 ppmv and 0 9 ppmv, respectively Xylenes
<br /> were detected in the May 12, 2005 effluent sample at concentration of 0 061 ppmv although they were not
<br /> ' detected in the influent sample and may represent a slug of higher concentration vapor going through the
<br /> system at the time of collection Xylenes were detected in the June 29, 2005 effluent sample at
<br /> concentration of 0 072 ppmv
<br /> ' MTBE, TBA, TAME, ETBE, DIPS, 1,2-DCA, and EDB were not detected in the effluent vapor samples
<br /> collected on April 8,May 12,2005 and June 29, 2005
<br /> A summary of vapor analytical data is provided in Table 4 Groundwater laboratory data sheets and chain-
<br /> of-custody documentation are contained in Attachment 4
<br /> Water Treatment System Analytical Results
<br /> ' The influent, vessel 1, and effluent water samples from the treatment and discharge component of the
<br /> vapor extraction system were sampled during the first quarter 2005 on April 8, May 12, May 31, and June
<br /> 29,2005
<br /> TPHg, benzene, toluene, ethylbenzene, and xylenes were detected in the influent water sample collected
<br /> on April 8, 2005, from the treatment and discharge component of the vapor extraction system at
<br /> ' concentrations of 570 ug/L, 12 ug/L, 12 ug/L, 23 ug/L, and 120 ug/L, respectively
<br /> 1 s\"V1To1625961quarpyl2gr-2005 doc 6 ATC ASSOCIATES INC
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