ARCHIVED REPORTS_XR0012646 - Laserfiche WebLink

Home Browse Search

Lammersville School District July 16, 1990 2021899.7004 7t_ your..,G14 With the exception of the soil sample obtained from MW-6, the analyzed soil samples did not contain TPN-G or BTEX above their respective method detection limits, Analysis of sample MW-6A(7 feet below ground surface) revealed the presence of TPH-G at a concentration of 4 ppm. Benzene,toluene, ethylbenzene, and xylene were detected at concentrations of 0.39 ppm, 0.07 ppm, 0.12 ppm, and 0.28 ppm, respectively. The soil sample analyzed from MW-6 was obtained just below the water table, therefore the TPH-G and BTEX concentrations detected may be attributable to the petroleum hydrocarbons detected in the groundwater. Copies of the certified analytical reports are presented in Appendix Ill. 7,2 GROUNDWATER With the exception of the groundwater samples obtained from MW-2 and MW-6, none of the samples obtained contained BTEX above method detection limits. Analyses of the groundwater sample collected from MW-2 revealed the presence of benzene, toluene, ethylbenzene, and total xylenes at concentrations of 15 ppb,6 ppb, 37 ppb, and 8 ppb, respectively. Analyses of the groundwater sample obtained from MW-6 revealed the presence of benzene, toluene, ethylbenzene, and total xylenes at concentrations of 4,800 ppb, 830 ppb, 1,400 ppb, and 2,800 ppb, respectively. The maximum contaminant levels(MCL)in drinking water for these compounds,as established by the State Department of Health Services (DMS), are 1 ppb for benzene, 100 ppb for toluene, 680 ppb for ethylbenzene, and 1,750 ppb for xylenes. TPH-G was detected in the groundwater samples obtained from all eight monitoring wells on site. The concentrations detected ranged from 17 ppb in MW-4 to 17,000 ppb in MW-6. TPH-D was not ffi detected above its method detection limit of I ppb in the groundwater samples obtained from MW-1 through MW-8. Currently, no drinking water standards have been established by the DHS for TPH-G or TPN-D. No separate-phase petroleum hydrocarbons were measured in any of the eight monitoring wells on site, Results of the groundwater analyses are presented in Table 6. Copies of the certified analytical results for the,`wle 21, 1990 sampling period are presented in Appendix ill. �. : GROUNDtt.1TER TEC}INOLOCI:1,N'C.