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Ms Lori Duncan Project No 880-039 1A June 18, 2003 Page 8 Groundwater Sample Results Groundwater analytical data are summarized in Table 2 Laboratory reports with chain-of-custody (COC) documentation are included in Attachment F Groundwater was encountered in the well borings at approximately 21 feet bgs The historical groundwater gradient is approximately 0 001 to 0 004, and predominantly to 9S9WSV, the no_t h-northwest Groundwater samples were collected from newly installed wells --� MW-2R, MW-3R, MW-4R(S) and MW-4R(D) following development TPHg were reported in wells MW-3R, MW-4RS, and MW-4RD at concentrations of 120, 62,000, and 21,000 ug/l, respectively Benzene was reported in all four wells at concentrations ranging between 1 5 and 7,300 ug/l MtBE, D11PE, ETBE, TAME, TBA, 1,2-DCA, or IEDB were not detected in any of the groundwater samples from these wells AIR SPARGE TEST Field data collected during the air sparge test are summarized in Table 3, and field data sheets are included in Attachment C S9�av ,"I owko J W-"L`3 cn Vapor Results Vapor analytical data are summarized in Table 4, and laboratory reports with 7 ! chain-of-custody (COC) documentation are included in Attachment F At the start of the sparge test, volatile rani _compounds (VOCs) were not detected in vapor extracted from wells VW-2 or�VW-(Tble 3) After 110 minutes, vapor samples were collected from wells VW-2 and VW-3 and submitted to a laboratory for analysis TPHg vapor concentrations in wells VW-2 and VW-3 were 7,600 and 290 mg/m3, respectively Helium was infected into well VW-3, and within 10 minutes was detected in well MW-4R, and in wells VW-2 and MWAR in 20 minutes (Table 3) Based on helium detections in well MW-1R, the radius of influence appears to be at least 46 feet Dissolved oxygen levels in the wells did not change significantly throughout the test r IISACRFP1\COMMONIsacDP120031Pr188018800391A 3ae doc