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r A S S O C I A T E S I N C billion (ppb) in well MWi to 100,000 ppb in well MW3 Concentrations of benzene ranged from 3,200 ppb in well MW1 to 19,000 ppb in well MW2 Groundwater samples collected from wells MW1, MW2, and MW3 contained no detectable concentrations of oxygenate fuel additives Analytical results of groundwater samples are summarized in Table 3 ' The groundwater sample collected from well DW contained detectable concentrations of BTEX Benzene was the only constituent that exceeded the State of California Maximum Contaminant Level (MCL) Trace amounts of four other constituents were also detected above the Method Detection Limit (MDL), but these results are below the Practical Quantitation Limit (PQL) Because the results for the four other constituents were below the PQL, these results can not be ' accurately defined All other volatile organic constituents analyzed were nondetectable Mr Hanan Fradkin confirmed in a conversation with ATC on January 13, 1999, that the water from well DW was being used to wash equipment and machinery, but was not being utilized as a source ' of drinking water The site's drinking water is provided by a bottled water company 5.0 WELL SURVEY 1 ATC reviewed Department of Water Resources (DWR) groundwater well construction logs and conducted a site walk in the vicinity of the site to identify groundwater wells located within 2,000-foot radius of the site The search revealed thirteen wells located within approximately 2,000 feet of the site Two of the thirteen wells are located within approximately 500 feet of the site The well locations are shown on Figure 4 ' The wells were located on the map according to "well location" description information provided on the well construction logs Available well construction logs are contained in Appendix E The ' groundwater gradient is to the southwest Two wells located on the south side of Munford Road (Wells Nos 5 and 6, Appendix E) are the closest to the site(within approximately 500 feet south) According to the well log, Well No 5 is approximately 142 feet deep and supplies drinking water to the residence at 3606 Munford Road The well is not screened Because this well is located crossgradient to downgradient from the isite, it is ATC's judgment that it is possible, but unlikely, that the well has been impacted or is threatened by petroleum hydrocarbons from the site According to the well log, Well No 6 is 205 ' deep and supplies drinking water The well is screened from 160 to 200 feet below ground surface (bgs) Although this well is screened at a deeper interval, due to the fact that this well is located crossgradient to downgradient from the site, it is ATC's judgment that it is possible, but ' unlikely, that the well has been impacted or is threatened by petroleum hydrocarbons from the site Four wells are located downgradient from the site, but these wells located approximately 1,000 ' feet from the site (Well Nos 1, 2, 3, and 4, Appendix E) All four wells supply drinking water to the facilities at their locations Three of the wells are not screened (Well Nos 1, 3, and 4) Well No 2 is screened from 190 to 240 feet bgs Because these wells are located approximately 1,000 w 116393`reports\swni doc 5 I