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L � 6w Prior to construction of monitoring wells, all casings will be cleaned in the same manner as the drilling equipment. A-3 Decontamination Rinsate and Soil Cuttings Disposal: The soil cuttings generated by drilling operations will be retained on site, and either covered by plastic sheeting or containerized in Department of Transportation-approved drums. The drilling equipment +-� will be steam-cleaned on racks, and the rinsate will be retained in a steel trough, and then transferred to drums. Water purged from monitoring wells will be containerized in drums if contamination is known or suspected. Drums containing soil, rinsate, and purged water will be sealed and temporarily stored on site at a location remote to the public. Each drum will be 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. A-4 Sample Handling and Chain-of-Custody: Records will be developed for soil and groundwater samples including: sampling date, sample type, location, depth, job number, name of sampling personnel, and method of preservation. Each sample container will be labelled immediately following collection in the field. Chain-of-custody protocol, described in United States Environmental Protection Agency (U.S. EPA), 1986, Test Methods for Evaluating, Solid Waste, SW-846, 3rd edition, will be followed. Samples will be placed in an ice chest and maintained at approximately 4°C until they are delivered to the laboratory. The temperature within the ice chest will be monitored and recorded during the course of transport and delivery. Samples will be accompanied by proper chain-of-custody documentation. Upon arrival at the laboratory, the samples will be preserved for analysis in accordance with U.S. EPA and state of California requirements. Samples will be delivered to Twining's chemistry laboratory in Fresno,California. Analytical methods with corresponding method detection limits and copies of the chain-of-custody records will be provided in the technical report. V A-5 Laboratory Quality Assurance/Quality Control (QA/QQ:This section describes the laboratory QA/QC procedures which will be followed during the analyses of the soil and groundwater samples by Twining's analytical chemistry laboratory. The QA/QC procedures will be developed to minimize outside interferences during analyses ,., for each sample. The laboratory manager will be in charge of creating and maintaining the program. In general, QA/QC proposed for this investigation are summarized as follows: 6w ■ Analytical instruments are serviced on a regular basis to monitor accurate calibration; ■ Organic-free water will be monitored daily for quality; ■ Gas chromatographs will be calibrated daily; ■ Method blanks will be tested to check whether the glassware and reagents are free of interference from chemicals that would invalidate the analyses; and V V