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' Mr. Al Blevens Project 20939-011.001 <br /> April 24, 1998 <br /> Page 3 <br /> ' LABORATORY ANALYSIS <br /> The groundwater grab samples collected from borings GP-1 and GP-5 and selected soil <br /> ' samples from each soil boring (GP-1 through GP-5) were analyzed for benzene, toluene, <br /> ethylbenzene, and xylenes and methyl-tert-butyl-ether using U. S. Environmental <br /> Protection Agency (USEPA) Method 8020; and for total petroleum hydrocarbons (TPH) <br /> ' as gasoline using USEPA Methods 3550/Modified Method 8015, for TPH as diesel, <br /> motor oil and kerosene using USEPA Method 8015 modified, for halogenated volatile <br /> organics compounds (VOCs) using USEPA Method 8010, and for lead using USEPA <br /> Method 7420. <br /> INVESTIGATION RESULTS <br /> ' Site Lithology <br /> Soils encountered during this investigation consisted of approximately 2 to 5 feet of <br /> ' sandy silt with a trace of gravel and organics beneath approximately 3 inches of asphalt <br /> and 1 foot of road base. Beneath the sandy silt exists sand with some silt to the depths <br /> drilled. Groundwater was first encountered in borings GP-1 through GP-5 ranging from <br /> ' 6.5 to 6.8 feet bgs. A copy of the exploratory boring logs are included in Appendix A. <br /> Soil and Groundwater Analytical Results <br /> Table 1 summarizes the soil analytical data, while groundwater analytical results are <br /> ' summarized in Table 2. Certified analytical reports and chain-of-custody records are <br /> included in Appendix B. <br /> Except for TPH as motor oil detected at 550 milligrams per kilogram (mg/kg) in the soil <br /> sample collected from boring GP-5 at 3.5-4.0 feet, none of the parameters tested for were <br /> detected in the soil or groundwater samples submitted from soil borings GP-1 through <br /> GP-5. In boring GP-5, TPH as motor oil was reduced to non-detectable concentrations <br /> at 13.5-14.0 feet bgs. In addition, the groundwater sample collected from this boring <br /> did not contain detectable levels of any parameters analyzed. <br /> CONCLUSIONS <br /> Petroleum hydrocarbons have locally impacted soils near boring GP-5. The TPH as <br /> ' SAC\K:\THORNTON.DOC-96\cmelzinge:I Emcon <br />