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1 <br /> collected on October 3, 1994, after development & purging of the <br /> well. Significant levels of BTEX and TPH-G were measured, which <br />' is consistent with soil sample analyzes described above. The <br /> test for halogenated volatiles, (EPA 601 , ) showed that all con- <br /> stituents were below detection levels. <br />' Copies of the laboratory sheets & chain of custody are included <br /> as EXHIBIT F. <br /> A licensed surveyor determined the wellhead elevation to assist <br /> in gradient determinations A copy of that survey is included as <br />' EXHIBIT G_ <br /> CONCLUSIONS: <br />' A review & analysis of the data obtained to date indicate that: <br /> 1 . Residual amounts of waste oil detected in the soil beneath <br />' the property do not require remediation. <br /> 2 BTEX & TPH-G were not measured above 36' in any of the 5 soil <br /> borings placed on the property. <br /> 3. Levels of BTEX & TPH-G exceed allowable levels in both soil <br /> and groundwater. <br /> ' 4. Soil samples taken after removal of the two (2) 3, 000 gallon <br /> gasoline in 1987 were below detection limits for Benzene, <br /> Toluene, Xylene, EDB, & TPH. Although specific locations & depths <br /> t are not given, it is assumed the samples were taken about 12-13' <br /> below grade Based upon the lithology observed in the 5 soil <br /> borings, numerous sand bodies are present beneath the property at <br /> ' depths below 101 _ Gasoline compounds were not detected above 36' <br /> in the bore holes, indicating either: ( 1) contamination has <br /> migrated downward through the porous sediments; or (2) an offsite <br /> source exists. There is no direct evidence at this time to <br /> indicate such a site_ PLATE XI is a fence diagram through all <br /> five (5) of the soil borings; SB-5, (KW-1 ) has been projected <br /> ' into the line of section to facilitate construction. <br /> RE OMMENDATIONS: <br /> Based on an analysis of the work performed to date, the following <br /> recommendations appear appropriate. <br /> 1 . Determine water depth & sample well within 30 days of <br /> original event, & analyze for BTEX & TPH-G. Initiation of a <br /> quarterly monitoring program may be proposed depending on the <br /> results of the second sampling. <br /> 9 <br />