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404 WEST FREMONT <br /> WKA No 1628 01 <br /> February 25, 1993 <br /> Page 6 <br />' Ground Water Conditions <br /> Ground water was encountered during drilling at a depth of 26 feet below grade Recent ground <br /> water measurements (February 24, 1993) indicate the ground water remains at 26 feet below <br /> grade Based on these latest water level measurements, the ground water flow direction beneath <br />' the site appears to be flowing generally to the north and east with a hydraulic gradient of <br /> 0 002 ft/ft <br /> 1 <br /> Ground water samples were collected from wells MW2, MW3, and MW4 on December 21 and <br /> ' 22, 1992 after they had been developed and purged as described in Appendix A Detectable <br /> TPH-gasoline concentrations were found in the water samples collected from each well with the <br /> ' exception of well MW3, in which only trace toluene concentrations were encountered TPH- <br /> gasoline concentrations in wells MW2 and MW4 were 69 gglf and 11,000 Aglf, respectively <br /> Benzene concentrations in water samples from wells MW2 and MW4 were 0 51 ag/f,, and 1100 <br /> gglf respectively Well MW1 was sampled on April 8, 1992 A 118 to 114-inch thickness of <br /> product was observed floating on the water A sample of the product revealed a TPH-gasoline <br /> ' concentration of 20,000 uglf and a benzene concentration of 180 gg/f, no diesel or motor oil <br /> was detected No floating hydrocarbons were observed in any of the wells during water level <br /> measurements taken on February 24, 1993 A summary of test results for the water samples is <br /> included as Table 3 Laboratory reports and chain-of-custody documents are included in <br /> ' Appendix B <br /> CONCLUSIONS <br /> ' Based on review of past work at the site and findings from our present investigation, soil and <br /> ground water contamination as gasoline exists beneath the site The majority of gasoline <br /> ' contamination in soils appear to be limited to the immediate vicinity of the former fuel tank The <br /> majority of these soils have been excavated and removed <br /> WALLACS KUHL <br /> Er ASSOCIATES INC <br /> R rnlcd paper <br />