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The only well showing detectable fuel hydrocarbon concentrations is M-9. <br />It should be noted that free product was visually detected in wells <br />"Old" 1, M-1, M-2 and M-9, yet the groundwater sample analyses detected <br />hydrocarbons in M-9 only. One possible explanation for this discrepancy is <br />that the wells are of inappropriate design and/or construction and product <br />from surface waters collected in the wells during periods of site flooding. <br />Fuel product was therefore detected in a number of wells prior to purging. <br />After purging product would have been detected in only those wells which <br />were in contact with groundwater containing product. <br />Another possible explanation is that the fuel products are <br />preferentially retarded by the soils at the site, and that after purging <br />groundwater was capable of moving into the well but not the product. This <br />phenomenon has been observed at other sites where the soils have a <br />preferential "wetting" to water over fuel hydrocarbons. <br />Table 4.4: Surface Water Sample Analyses <br />Station Date <br />Total Fuel <br />Hydrocarbons Benzene Toluene Xylene <br />(mg/1) (mg/1) (mg/1) (mg/1) <br />Marina Surface (MS-1) 3/3/86 ND ND ND ND <br />Marine Deep (MV-1) 3/3/86 ND ND ND ND <br />Landfill Surface (LS-1) 3/3/86 ND ND ND ND <br />Landfill Deep (LV-1) 3/3/86 ND ND ND ND <br />Marina Surface (MS-2) 3/3/86 ND ND ND ND <br />Marina Deep (MV-2) 3/3/86 ND ND ND ND <br />Marina Surface (WS 0) 3/8/86 ND ND ND ND <br />Detection Limits 10 0.5 0.5 1.0 <br />ND = Not Detected <br />4-4