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Delta Truck Sales -3- 11 October 1989 <br /> Based on the description of the source of the debris as well as current <br /> observations of the unearthed material we will decide whether further chemical <br /> characterization is necessary. At this time the fill need only be sampled as <br /> necessary to determine the extent of migration of contaminants from the <br /> surface impoundment. <br /> CONCLUSIONS <br /> Characterization of the stockpiled soils should commence with consideration of <br /> the above comments. The extent of further excavation should be determined <br /> before continuing with that excavation. The source of the fill found at the <br /> site should be described in order to determine whether it may pose a threat to <br /> water quality. <br /> Please notify me at least one week before field work begins so that I have the <br /> opportunity to observe field procedures and split samples. If you have any <br /> questions regarding this letter, please call me at (916) 361-5734. <br /> ROBERT L. NIBLACK <br /> Engineering Geologist <br /> RLN <br /> cc: Mr. Don Shaulis, Permitting Unit, Toxic Substances Control Division, <br /> Department of Health Services, Sacramento <br /> V Mr. Ron Valinoti , San Joaquin Local Health District <br /> Mr. David Frank, Trainor, Robertson, and Smits, Sacramento <br /> Mr. Stephen Boll , Kleinfelder Associates, Sacramento <br /> Mr. Henry Cecchini , Antioch <br /> Mr. Charles Giovannoni , Antioch <br /> Mr. Vern Cummings, Stockton <br /> Mr. Ross Gannon, Stockton <br />