ARCHIVED REPORTS_XR0008416 - Laserfiche WebLink

Home Browse Search

i I12 June 1996 AGE-NC Project No 95-0104 Page 4 of 5 at concentrations of 780 parts per billion (ppb, reported as micrograms per liter) and 5,000 ppb, respectively IBenzene was detected 1n MW-1, MW-3, and VW-1 at concentrations of 8 3, 0 56 and 44 ppb, respectively Toluene and xylenes were detected in MW-1, MW-2, MW-4, and VW-1 at I concentrations as high as 790 ppb (xylenes, VW-1) Ethylbenzene was detected from MW-1 and VW-1 at concentrations of 5 4 and 150 ppb, respectively Analytical results of TPH-g and BTE&X in ground water are summarized in Table 2 The laboratory report (AAL Laboratory Batch No 96- 0425-014-01 through 05) and chains-of-custody are presented in Appendix B MTBE was not detected in any of the ground water samples Halogenated volatile organic compounds (HVOCs) were detected in samples collected from each well during the April 1996 sampling event at concentrations ranging from 5 2 ppb (1,1,1- Trichloroethane in MW-3) to 250 ppb (1,2-dxchloroethane in MW-1) Analytical results of HVOC analysis are summarized in Tables 3 through 6 The laboratory report (AAL Laboratory Batch No 96-0425-014-01 through 05) and chain-of-custody forms are presented in Appendix B 5 0. CONCLUSIONS & RECOMMENDATIONS 51 CONCLUSIONS ILaboratory analysis of ground water samples indicated an increase in TPH-g concentrations in monitoring wells MW-1 TPH-g was also detected from a ground water sample collected at VW-1 Several BTEX constituents continue to be present in ground water samples collected during April 1996 Of the nine BTEX constituents detected in ground water samples from wells MW-I through ' MW-4 during April 1996, concentrations increased for all nine analytes BTEX constituents were also present in ground water samples collected from VW-1 Concentrations of benzene detected in MW-I and VW-1, and toluene detected in VW-I are above the State of California Maximum ' Contaminant Levels (MCLS) for drinking water of 1 0 pgll and 150 Pg/l, respectively Several HVOCs continue to be present in ground water samples collected from MW-I through MW- ' 4 during April 1996 Of the eight constituents detected in ground water samples, concentrations increased slightly for six analytes and decreased slightly for two analytes Detected concentrations I of 1,2- Dichloroethane, 1,1- Dichloroethylene, and Trichloroethylene from wells VW-1 and MW-1 through MW-4 are above the State of California Maximum Contaminant Levels(MCLs)for drinking water of 0 5 pg/l, 6 0 pg/l, and 5 0 pg/l, respectively Conversely, concentrations of 1,1,1- Trichloroethylene detected from MW-3 is below the State of California MCLs for drinking water I