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Equipment and well material decontamination will be conducted on an impermeable surface and all decontamination effluent will be contained. All surfaces of the equipment will be thoroughly decontaminated using an appropriate cleaning solution. The equipment will be placed on a drying rack for air drying. The decontamination water will be stored in containers certified for hazardous materials storage and disposed of in an approved manner. Sample equipment to be used for pesticides and organic analysis will be washed in a nonphosphate detergent (Alconox or equivalent) and rinsed with tap water and deionized water. 7.0 FIELD EQUIPMENT CALIBRATION AND MAINTENANCE The following measuring equipment may be used during the Site Investigation. Equipment is grouped by field activity. Calibration procedures and frequency are listed for each piece. Soil Borings and Well Dimensions - Steel and coated cloth tape. Calibration: none. Organic Vanors- Photoionization detector. Calibration: Daily logged field calibration using a hexane standard as per manufacturers instructions. All equipment will be checked daily and replaced as necessary. Instrument manuals and an instrument log book will accompany equipment into the field. Any calibration, repairs or related information will be recorded in the log book. 8.0 LABORATORY QA/QC PLAN Soil and groundwater samples will be submitted to a State Certified Hazardous Waste Laboratory for chemical analysis of hazardous constituents. Established QA/QC procedures for analytical operations will include sample custody procedures, standards of analytical accuracy, analysis of matrix spikes and method data, and maintenance of control charts to monitor analytical performance. These QA/QC procedures are outlined in the laboratory QA/QC 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 performance audits conducted by EPA and DHS using QC labs. The specific analytical methods to be utilized for purgeable and semivolatile hydrocarbons analyses are shown on Table 5. 9.0 SOIL SAMPLING PROTOCOL A proposal will be submitted to the lead Regulatory Authority with proposed boring/sampling locations. The exact location and number of borings at each site will be determined in the field by the Project Geologist/Engineer. Prior to arriving at the sample site, the drill riglaugers will be steam cleaned and all sample equipment will be