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t PG&E's CGT Tracy Gas System Vntenance Station • APPENDIX NO. 3 24081 Mountain House Parkway SPEC. NO. CGT-TRACY-UST-01-2003 Tracy, CA 95376 vapors will be purged from tanks 1 hour prior to removal and when transported, by using 20 pounds arbon dioxide (dry-ice) per 1,000-gallon tank capacity(60 lbs. Minimum per tank). le rinsed tank and associated piping will be removed by Kroeker, Inc.. Piping will be stockpiled on- ? prior to disposal. nk and associated dispensers will be transported to and decontaminated by Ecology Control custries, Inc., 255 Parr Blvd., Richmond 94801 (Phone: 510-235-1393). ECI will decontaminate, ap, and recycle the tanks and dispensers as scrap metal. 6 an excavated material will be stockpiled on-site for use in backfilling the excavation. x> t on the removal of tank and its associated piping, soil samples will be taken under the direction of Art k mile of Krazan and Associates, State of California Registration Number 5383 Tel. ((559)348-2200 ";:2133 C. Inspection and Sampling Procedures: The following procedures will be used in the removal of the subject tanks and their associated piping: 1. Visual inspection of the tank and associated piping upon removal. All external tank surfaces, fittings, and associated piping shall be inspected for evidence of holes or leakage. The results of such inspection shall be documented in writing, with photographs. 'ual inspection of excavation. Surfaces shall be inspected for evidence of leakage. Evidence of age would include stained soil, areas of free product, etc. The results of such inspection shall be umented in writing, with photographs where appropriate. Wo (2) soil samples shall be analyzed from beneath each tank one from directly beneath the fill pipe, the ler from a similar position at the opposite end of the tank. In addition, a separate sample shall be taken every 20 lineal feet of trench for piping. If obviously stained or contaminated areas exist in locations ;er than the above locations, we may elect to remove the material and dispose of as a hazardous waste. V.1- 4. 4. ;Soil samples shall be collected from the native soil at or just below the interface of the backfill with the 'native soil. Samples shall be taken using a driven-tube type sampler, capped and sealed with inert materials, and extruded in the lab in order to reduce the loss of volatile materials. Formal, signed chain-of- custody records shall be maintained for each sample and submitted with the results to Pacific Gas and electric Company. 5. Immediately upon removal of the tank,. A backhoe bucket of native soil shall be taken from the native soil/backfill interface. This soil shall be rapidly brought to the surface. 6 ; 'proximately 3 inches will be rapidly scraped away from the surface of this soil, then a clean brass �qy u ,e (at least 3 inchas long) shall be driven into the soil with a slide hammer. y £ o composite samples shall be collected for testing from the stockpiled backfill from the tank i,5 11, avation. 8 '. , mples shall be taken in the piping trench by hand driving a clean brass liner(at least 3 inches long) o the soil, with a slide hammer, every 20 linear feet of trench. 9. The samples shall be immediately placed on ice for transport to a laboratory. Again, formal chain-of- custody records shall be maintained for each sample. X jt Page 2 of 4