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` A S S O C I A T E S I N C e feet from the site, it is ATC's judgment that it is possible, but unlikely, that the wells have been impacted or are threatened by petroleum hydrocarbons from the site Potential impacts to nearby Wells Nos 1 through 6 can not accuratelybe evaluated until the extent of the petroleum hydrocarbon impacted groundwater has been defined ' The remainingseven wells are located eater than 1 000 fee gr t from the site or are located upgradient or crossgradient from the site Based on this information, it is ATC's judgment that it ' is unlikely that these wells have been impacted or are threatened by petroleum hydrocarbons from the site ' An on-site search for potential receptors was conducted on November 16, 1998 by ATC personnel There is an on-site groundwater supply well (DV) that has been impacted by BTEX ' constituents The well is located approximately 36 feet south of well MW3 The well construction log for this well was not on file with the DWR in Sacramento A slough was observed approximately 10 feet north of well MW2 The slough runs east to west and crosses the ' middle of the site There was no water observed in the slough on November 16, 1998, but in a conversation with site personnel, ATC was informed that the slough generally contains water during the winter months Duck Creek is located approximately 1,200 feet north of the site No other open ponds or streams were located within 2,000 feet of the site 6.0 DISCUSSION Based on the analytical results and field observations, soil and groundwater beneath the location of the former USTs are impacted by TPHg and BTEX The extent of impacted soil and ' groundwater is unknown None of the soil or groundwater samples collected from the beneath the location of the former USTs contained oxygenate fuel additives In the judgment of ATC, additional site investigation activities are necessary 1 1 1 w\16393Veportfturm doc 6 I