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1 - TL 39¢007¢0 City of Stockton Yon Buskirk Park Golf Course 1 July 29, 1994 Page A-3 responsibilities include maintaining accurate records of the samples analyzed along with the analytical data produced. This involves labelling chromatograms and maintaining the laboratory numbers on subsamples taken from the submitted samples, Iabelling glassware used in the analyses, and properly labelling sample extract containers with each sample's laboratory number. Following analyses, the samples are transferred to a limited-access storage room. Chain-of- custody forms, chromatograms, and other pertinent information are filed for future reference. Splits of samples analyzed are kept for 30 days. Samples containing hazardous concentrations will be returned to the client for disposal. A-3 Standard Operating Procedures for Equipment Decontamination Proper decontamination procedures reduce the potential for: cross-contamination among sample locations; and introduction of contamination from outside sources. SBefore, during, and following drilling operations, drilling equipment is thoroughly cleaned using a high pressure hot water (steam) washer. Well casing, screen, end caps, and centralizers will also be cleaned using the steam washer. will a containerized for later disposal. Generally, disposal will Steam cleaning condensate b p y, p be the client's responsibility. Sampling equipment and any tools, measuring devices, or other equipment which will contact soil, groundwater, or any media being assessed will be washed in a low-phosphate soap and water solution, and rinsed in clean water before each use. The type of soap used will depend upon project requirements. iA-4 Standard Operating Procedures for Decontamination Rinsate, Monitoring Well Purge Water, and Soil Cuttings Disposal The soil cuttings generated by drilling operations are retained on site, and either covered by plastic sheeting or containerized in United States Department of Transportation (DOT)- ' , approved drums. The drilling equipment decontamination riseate is also stored in drums. Water purged from monitoring wells is containerized in drums if contamination is known or suspected. Drums containing soil, rinsate, and purged water are sealed and temporarily stored on site at a location remote to the public. Each drum is labelled to identify its contents. Disposal of these wastes will be the responsibility of the client. The client will be informed that the wastes must be disposed in accordance with applicable Federal, State, and local regulations.