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U <br /> s ; i <br /> ATC Associates Inc. <br /> Quality Assurance/Quality Control Plan <br /> Revised 1998 <br /> I <br /> a <br /> Sample equipment to be used for pesticides and organic analysis willbe washed in a nonphosphate <br /> detergent (Alconox or equivalent) and rinsed with tap water, followed by deionized water. If the <br />{' equipment is for metals analysis, the initial rinse will be conducted with 0.1 N nitric acid followed by <br /> i� <br /> tap water and deionized water. <br /> �1 ! <br /> 7.0 FIELD EQUIPMENT CALIBRATION AND MAINTENANCE <br /> u <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 Borings and Well Dimensions <br /> �I Steel and coated cloth tape. Calibration: none. <br /> I; Water Level Measurements in Wells <br /> ii <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 /> i <br /> Organic Va ors <br /> Photoionization Detector {PID). Calibration: daily field calibration using a isobutylene <br /> standard as per manufacturers instructions. <br /> 'j. <br /> Groundwater AH Measurement3 <br /> I{ <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 /> 1 <br /> .i <br /> I <br /> I1 <br />