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v <br /> 0 <br /> A S S O C I A T E S I N C <br /> Oxygenates fuel additives including MTBE, were also not detected above laboratory detection <br /> limits in the soil samples from bonngs CPT-1 and CPT-2 <br /> Analytical results of soil samples are summarized in Table 1 <br />' 44.2 Groundwater Analytical Results <br /> The groundwater sample collected from bonngs CPT-1 and CPT-2 did not contain concentrations <br /> of TPHg or benzene, toluene, ethylbenzene and total xylenes above laboratory method detection <br /> limits of 50 parts per billion (ppb) and 0 50 ppb, respectively <br /> The oxygenates fuel additives, including MTBE, were not detected in groundwater samples <br /> collected from bonngs CPTI and CPT2 above their respective laboratory method detection limits <br /> tA review of the analytical data indicates that the MTBE concentration in groundwater from <br /> bonngs CPT-1 and CPT-2 does not exceed the current California water quality goals for drinking <br /> water The California Department of Health Services (DHS) adopted a secondary drinking water <br />' standard (maximum contaminant level, MCL) of 5 ppb for MTBE, effective January 7, 1999 The <br /> primary MCL established DHS for MTBE is currently under development, however CaVEPA's <br /> Office of Environmental Health Hazard Assessment (OHHA) has adopted a 13 ppb Public Health <br /> Goal for MTBE which is being utilized by DHS as an action level Analytical results of <br /> groundwater samples are summarized in Table 2 <br /> 5.0 DISCUSSION <br />' Based on the analytical results and field observations, soil and groundwater beneath the location <br /> of the former UST does not appear to be impacted by petroleum hydrocarbon constituents Soil <br />' samples collected from depths of 50 feet and 91 feet bgs, did not contain detectable <br /> concentrations of petroleum hydrocarbons Groundwater in the first confined aquifer, in samples <br /> collected from a depth of 93 feet bgs, does not appear to be impacted by petroleum hydrocarbons <br /> In the judgment of ATC, further subsurface investigation does not appear necessary <br /> w lwordpro117292117292 011reports\sup_m1 dm 4 <br />