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Sample Tank # Samcle Point (See Plate 2) S-01 -01 Tank Vault #1 2' below concrete south-end of tank ' S-02-01 Tank Vault #1 2' below concrete north-end of tank S-03-01 Tank #2 2' below excay. tank center S-04-01 Tank #3 2' below excay. south-end of tank ' S-05-01 Tank #3 2' below excay. north-end of tank S-06-01 Tank #4 1' below excav tank center ' The samples were shipped to Chemical Research Laboratories (CRL), Santa Maria, California, via overnight delivery. Appropriate ' chain of custody forms were filled out and accompanied the samples to the lab. Completed chain of custody forms are provided in Appendix B. ' 3.8 Tank Excavation Backfill 1 Mr. Tom Deen authorized the filling of the excavation with clean fill dirt and asked that the AT&SF office in Stockton be contacted to ' determine if they had any fill dirt available. Mr. D. L. Knephoff, AT&SF, was contacted but he was unable to locate suitable soil for ' the site. Approximately 96 cubic yards of clean backfill were brought to ' the site by Erickson, Inc. The excavation was filled and the backfill material was recompacted to relative compaction of 90 per cent. ' The site was brought to grade to the satisfaction of the adjacent property owners, Mr. Al Clark and Mr. Lanny R. Williams. Fences were replaced around the site. Valley Welding Supply's site was clean and reestablished to its original condition, to the satisfaction of Mr. Al Clark. 4.0 RESULTS Once the steel tanks at the Scotts Avenue site were clear of the excavation, the tank exteriors were cleaned and visually inspected. Several large holes, 1 to 10 inches in diameter, were observed in the ends and upper half of the tanks. Numerous smaller holes were noted in the lower half of the tanks. In addition, obvious product staining was evident on tank exteriors. 6