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4 <br /> 21 July 1991 <br /> (GeoAudit MDG Ukiah-1.9) <br /> Page 3 of 3 <br /> Space limitations prevents the use of all the "clean" soil as <br /> backfill . Therefore, GeoAudit proposes to transport the "clean" <br /> soil from treatment cell "C" (approximately 550 cubic yards) off- <br /> site for disposal. <br /> DRUM SAMPLING <br /> Nine 55-gallon drums of water are present on-site. In order to <br /> determine whether the water, which was purged from the wells during <br /> the previous monitoring period, still contains hydrocarbon <br /> contaminants, a composite sample of the contents was collected and <br /> analyzed for TPH as gasoline and BTE&X. Three of the nine drums <br /> were empty or contained very small quantities of water and <br /> therefore could not be sampled. The same analytical protocol was <br /> used for this water samples. <br /> No TPH as gasoline or BTE&X were detected in the composite sample <br /> from the drums. Since no contamination is present in the sample <br /> from the drums and their contents do not pose a threat to <br /> groundwater, GeoAudit proposes to dispose of the remaining contents <br /> of the drums on the property. <br /> I <br /> If you have any questions or comments, please contact our office. <br /> Sincerely, <br /> GEOLOGICAL AUDIT SERVICES, INC. <br /> Bob Marty Joshua Ong, Ph.D. <br /> Staff Geologist Senior Project Hydrogeologist <br /> Registered Geologist No. 4725 <br /> Enclosures <br /> cc: Mr. Eugene Huber, P.E. , R. E.A. - Security Pacific Corporation <br />• Mr. Phillip Towle - Mendocino County Air Pollution Control <br /> District <br /> t <br />