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0 performance. These QA/QC procedures are outlined in the laboratory Quality Assurance/Quality Control Plan which is available upon request. Organic chemical analyses will be performed in conformance with standard procedures established by the United States Environmental Protection Agency (EPA) in "Guidelines 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 audits conducted by the EPA and the State of California Department of Toxic Substances Control using QC laboratories. 7.0 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. 8.0 WASTE DISPOSAL PLAN This section provides guidelines for handling materials generated during the field activities associated with this investigation. All soils brought to the surface will be placed on and covered with 6 -mil plastic sheeting. The cuttings will be permitted to biodegrade at the surface during the course of this project. The water collected during decontamination operations, as well as excess water removed from the temporary wells during well purging and groundwater grab sampling procedures, will be stored on-site in sealed DOT -approved 55 -gallon drums. The drums will be labeled with the monitoring 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.