ARCHIVED REPORTS XR0001079 - Laserfiche WebLink

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C A M B R I A methyl ether(TAME), tertiary butyl alcohol (TBA), di-isopropyl ether (DUPE), and ethyl tertiary butyl ether (ETBE) by EPA Method 8260B HYDROCARBON DISTRIBUTION IN SOIL No TPHg, benzene,or fuel oxygenates (including MTBE)were detected in soil samples collected from boring CPT-5 Soil chenucal analytical data are summarized in Table 2 and presented on Figure 2 Laboratory analytical data are presented in Appendix C HYDROCARBON DISTRIBUTION IN GROUNDWATER TPHg and benzene were detected in groundwater from borings CPT-5 and CPT-9 through CPT-11 at concentrations up to 4,400 ppb and 3,200 ppb, respectively The highest concentrations for both TPHg and benzene were detected at 65 fbg in boring CPT-11 MTBE was detected in groundwater from borings CPT-6 and CPT-8 through CPT-11 at concentrations up to 36 ppb No other fuel oxygenates were detected in groundwater collected from any of the soil borings Groundwater chemical analytical data are summarized in Table 3 and presented on Figure 2 Laboratory analytical data are presented in Appendix C CONCLUSIONS Soil and groundwater results from boring CPT-5, drilled near the existing UST location, delineate the vertical extent of TPHg, benzene, and MTBE in this area s Groundwater analytical data collected from borings CPT-6 through CPT-8 define the lateral , extent of petroleum hydrocarbons to the west, southwest, and south of the source area Groundwater samples from the CPT-9 through CPT-11 contained primarily TPHg and benzene and to a lesser extent MTBE The highest concentrations of gasoline constituents were detected at depths ranging from 65 to 73 fbg The highest TPHg and benzene concentrations were detected east of the former USTs in boring CPT-11 at 65 fbg 0778 4