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Mr. Al Blevens Project 20939-011.001 <br /> April 24, 1998 <br /> Page 4 <br /> ' motor oil concentrations are below a typical cleanup level of 1,000 mg/kg. The long <br /> chain hydrocarbons typical of motor oil migrate very slowly through soils, and <br /> groundwater impacts are not present. The area is paved, further reducing infiltration of <br /> ' rainwater and potential leaching. Biodegradation and other natural attenuation processes <br /> will continue to remove the remaining hydrocarbons. Based on these factors it appears <br /> that the petroleum hydrocarbons as motor oil are unlikely to adversely impact <br /> groundwater. <br /> Although no health-based cleanup criteria have been established for motor oil in soil, the <br /> relatively high reference dose used by some states to evaluate the potential risk due to <br /> direct contact with oil (6 mg/kg-day) reflects the non-toxic nature of this product. <br /> ' STATEMENT OF LIMITATIONS <br /> ' The services described in this report were performed consistent with generally accepted <br /> professional consulting principles and practices. No other warranty, express or implied, <br /> is made. These services were performed consistent with our agreement with our client. <br /> This report is solely for the use and information of our client unless otherwise noted. <br /> Any reliance on this report by a third party is at such party's sole risk. <br /> ' Please call if you have any questions. <br /> Sincerely, <br /> ' MCON <br /> azo . Duke, R.G. US. nger, REA <br /> ' P eject Geologist Project Manager <br /> achments: Table 1 Soil Analytical Results, April 14, 1998 <br /> Table 2 Groundwater Analytical Results, April 14, 1998 <br /> Figure 1 Site Plan <br /> Appendix A Exploratory Boring Logs <br /> Appendix B Certified Analytical Reports and Chain-of-Custody <br /> Records <br /> cc: Harlin Knoll, San Joaquin County Environmental Health <br /> ' SAC\K:\THORNTON.DOG96\cmen±inge:I >Emcon <br />