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i r <br /> • ATC Msoclates Inc <br /> Quality AssuranWQuality Control Plan <br /> Revised 1998 <br /> Sample equipment to be used for pesticides and organic analysts will be washed in a nonphosphate <br /> detergent (Alconox or equivalent) and rinsed with tap water, followed by deiomzed water If the <br /> equipment is for metals analysts, the initial nnse will be conducted with 0 1 N nitric acid followed by <br /> tap water and deionized water <br /> 7.0 FIELD EQUIPMENT CALIBRATION AND MAINTENANCE <br /> The following measuring equipment may be used during the Remedial Investigation Equipment is <br /> grouped by field activity Calibration procedures and frequency are listed by piece <br /> Soil Borin-as and Well Dimensions <br /> Steel and coated cloth tape Calibration none <br /> Water Level Measurements in Wells <br /> Steel surveyors tape Calibration manufacturer supplied temperature correction will be applied <br /> as applicable for field conditions Electrical well sounders Calibration check against steel <br /> surveyor's tape <br /> Organic Vapors <br /> Photoionization Detector (PID) Calibration daily field calibration using a isobutylene <br /> standard as per manufacturers instructions <br /> Groundwater aH Measurement <br /> Digital pH meter Calibration standard pH solutions of 4, 7, and 10 will be utilized for daily <br /> field calibration according to manufacturers instructions <br />