Laserfiche WebLink
v _ <br /> atMa 0 <br /> 7� <br /> Subsurface Investigation December 12, 1990 <br /> Former Unocal Station No. 2859, Stockton, California AGS 38012.5 <br /> from boring B-6 because hydrocarbons had been defected at that depot during the June <br /> 1988 investigation. <br /> The soil samples were analyzed for TPHg using modified Environmental Protection Agency <br /> (EPA) Method 8015 and for BTEX using EPA Method 8020. The groundwater samples <br /> were analyzed for TPHg using modified EPA Method 8015 and for BTEX using EPA <br /> Method 602. The laboratory analyses were performed by Applied Geo5ystems in Fremont, <br /> California (Hazardous Waste Testing Laboratory Certificate No. 1211). <br /> Concentrations of hydrocarbons in soil and water samples collected during this investigation <br /> are summarized in Table 4. Results indicated TPHg and BTEX concentrations in soil were <br /> below detection limits for the methods used.TPHg was detected in water samples collected <br /> from wells MW-4 and MW-5 at 150 and 240 ppb, respectively. Results indicated benzene <br /> and toluene were below detection limits in both wells and elhylbenzene was below detection <br /> limits in well MW-4. The concentration of elhylbenzene in the water sample collected from <br /> well MW-5 was 8.1 ppb. Total xylene isomers were detected of 1.4 ppb in well MW-4 and <br /> 1.9 ppb in well MW-S. <br /> 12 <br /> v <br /> Applied iGeaSySten's <br />