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t t moi/ Lr/ 6.0 SAMPLING AND DRILLING EQUIPMENT DECONTANIINATION All equipment used for drilling and sampling will be decontaminated prior to use. All equipment used for collection of more than one sample, such as bailers and spoons, will be decontaminated between each use to prevent cross contamination between samples. Drilling equipment will be decontaminated prior to commencing drilling at each hole. Well construction materials will be cleaned as necessary, prior to installation. 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 a steam cleaner. 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 Remedial 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. • Water Level Measurements in Wells- Steel surveyors tape. Calibration: manufacturer supplied temperature correction will be applied as applicable for field conditions. Electrical well sounders. Calibration: check against steel surveyor's tape. • Organic Vapors- Photoionization detector. Calibration: Daily logged field calibration using a isobutylene standard as per manufacturers instructions. • Groundwater pH Measurements- Digital pH meter. Calibration: standard pH solutions of 4,7, and 10 will be utilized for daily logged field calibration according to manufacturers instructions. • Electrical Conductivity- Electrical conductivity meter. Calibration: factory-calibrated annually and periodically calibrated against laboratory prepared standard calibration solution. • Water Temperature- Mercury or digital thermometers. Calibration: one-time factory-calibrated. • Combustible Gas/Oxygen- Combustible gas/oxygen meter calibration: Factory calibrated, field calibrated monthly, zeroed daily according to manufacturers instructions. 4