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UPDATE 28 8-02-94 <br /> TOTAL PETROLEUM HYDROCARBONS <br /> Floating Product <br /> No floating product has ever been observed in any of the <br /> monitoring wells or borings at this site <br /> Dz ssol ved Petroleum Hydrocarbons -in Ground Water (EPA method 5030 <br /> TFH as gasoline) : <br /> The February 16, 1994 ground water sample results show a <br /> continuance of below detection limits for gasoline petroleum <br /> hydrocarbons MW5 tested below 1 ppm for gasoline range <br /> hydrocarbons since the June 24 , 1991 All other wells have <br /> tested below 1 ppm gasoline range hydrocarbons since the March <br /> 29 , 1992 sampling These analyses, when compared to those of <br /> December 15, 1991, substantiate the removal of hydrocarbons <br /> associated with the ground water, see Table 1 <br /> This latest sampling (July 21, 1994) shows below detection levels <br /> in all wells except MWS which showed the non gasoline single peak <br /> compound (probable 1, 2 , DCE) and trace amounts for degraded TPHg <br /> 0 08 mg/L. <br /> Before vapor extraction, November 21, 1990, gasoline range <br /> hydrocarbons were detected in MW1 (2 mg/L) , and MW5 (31 mg/L) <br /> BTEX in Ground Water (EPA method 602) <br /> All monitoring wells have tested below detection limits for <br /> Benzene, Toluene, Ethylbenzene and Xylenes (BTEX) for over one <br /> year with the exception of MW5 which had only xylenes during the <br /> February 16, 1994 sampling of 2 5 ug/L This most recent <br /> sampling (July 21, 1994) showed all wells to be below detection <br /> limits for BTEX <br /> Below are the maximum contaminant levels (MCL) s that are applied <br /> for drinking water in California <br /> MAXIMUM CONTAMINANT LEVELS (MCL) FOR PRIMARY DRINKING WATER, <br /> TITLE 22 or DHS <br /> Primary MCL Secondary MCL <br /> (no adverse (taste/odor) <br /> health affects) <br /> BENZENE 1 ug/L <br /> TOLUENE 1000 ug/L 42 ug/L <br /> ETHYLBENZENE 700 ug/L 29 ug/L <br /> Total XYLENES 1750 ug/L 17 ug/L <br /> page3 <br />