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TREADWELL & ROLLO <br /> 5.0 ANALYTICAL TESTING RESULTS <br /> The results of the analyses indicate that none of the chemical compounds referenced <br /> above were detected at levels exceeding method reporting limits with the exception of <br /> (race metals and extractable hydrocarbons that were identified as diesel fuel. A <br /> summary of the analytical results is presented in Table 2 and copies of the Curtis and <br /> Tompkins, Ltd. certified analytical results, including chain-of-custody records, are <br /> presented in Appendix B. <br /> Diesel fuel at concentrations of 450 and 290 micrograms per liter of parts per billion <br /> (ppb), was detected in the groundwater samples collected on 23 August 1991 from <br /> monitoring wells MW-1 and MW-2, respectively. No extractable hydrocarbons were <br /> detected in the groundwater sample from Monitoring Well MW-3. <br /> Diesel fuel was detected at concentrations of 280 and 230 ppb (duplicate sample) in the <br /> groundwater samples collected on 17 September 1991 from Monitoring Well MW-1. No <br /> diesel fuel was detected in the groundwater samples collected from Monitoring Wells <br /> MW-2 and MW-3. <br /> 6.0 SUMMARY AND CONCLUSIONS <br /> The summary and conclusions presented below are based on the work described in this <br /> report: <br /> o the site is immediately underlain by alluvial deposits consisting of largely fine- <br /> grained sand and silty sand and some silt and silty clay; this combination of <br /> materials is relatively transmissive <br /> o the measured local groundwater flow direction is to the northwest; the local flow <br /> gradient, as measured in the three monitor wells, is approximately 0.0026 feet per <br /> foot; this moderate gradient, together with the transmissive surficial geology, <br /> would be expected to promote fairly rapid migration of chemicals <br /> 8 <br /> 1107A201.CRJ 5 November 1991 <br />