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Establishing Test Procedures for the Analysis of Pollutants Under the Clean Water Act" (40 CFR Part 136, October 1984). The laboratory is periodically evaluated through external performance audits conducted by the EPA and the State of California Department of Toxic Substances Control using QC laboratories. Chain of Custody Chain of Custody procedures will be used to identify and ensure traceability of the samples collected. These procedures will also be used to document the handling and shipping procedures of the sample(s). Specifically, the Chain of Custody procedures will trace the sample(s) from collection, through all custody transfers, and finally to the storage facility or the analytical laboratory, where the laboratory's internal procedures will govern until final disposition of the samples. This information will be recorded on the Chain of Custody form which will remain with the samples at all times. Proper taping, locking, and sealing procedures shall be used to prevent or detect tampering of the samples. The Chain of Custody form(s) will be used for a packaged lot of samples (i.e., more than one sample will most likely be recorded on a single form). If all of the samples in a given lot cannot be recorded on a single Chain of Custody form, an additional form(s) will be used. WASTE DISPOSAL PLAN This section provides guidelines for the handling of any potentially contaminated materials generated during the field activities associated with this investigation. All soils brought to the surface will be stored on, and covered with, 10-mil plastic sheeting. All soil will remain on-site until analytical results are obtained from the analytical laboratory. The soils will be disposed of appropriately, based on the analytical results. The water collected during steam cleaning operation, as well as the water removed from wells during development, purging and sampling, will be stored on-site in sealed DOT-approved 55-gallon drums. The drums will be labeled with the well I.D. number(s), date, and nature of the contents. All drummed liquids will be sampled and properly disposed of based on the analytical results. California Uniform Hazardous Waste manifests will be completed by PG&E as required for the transportation and disposal of any hazardous waste that may be generated during the investigation. Disposal of all wastes will be conducted in accordance with federal, state, and local regulations. cca/9-30-92/8913a/JAWP13 13