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Page 6 <br /> Tracy Tire Fire <br /> Celeste Temple,Project Officer <br /> CONCLUSIONS <br /> Based on a review of the available information, the following conclusions have been drawn with <br /> respect to the migration of contaminants from the site: <br /> • The geologic materials in the shallow subsurface consist of interbedded gravel, <br /> sand, silt, and clay; <br /> • The hydraulic conductivity of the geologic materials that predominate in the <br /> shallow subsurface varies widely; and <br /> • Groundwater sampling analytical results indicate that there has been no impact to <br /> the water quality. <br /> If you have any question, please contact me at (415) 981-2811, ext. 285. <br /> Respectfull Submitted, <br /> )Jtehite <br /> START Member <br /> cc: Donn Zuroski, OSC, Emergency Response Office, EPA, Region 9 <br /> file <br /> I:\000610\SF389-0339T7RZXX\ITTzur3O.799.wpd <br /> 10/17/99 6:56 PM <br />