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Quality Assurance/Quality Control Plan Page 5 <br /> • Soil Borings 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 <br /> will be applied as applicable for field conditions. Electrical well sounders. <br /> Calibration: check against steel surveyor's tape. <br /> • Organic Vapors - <br /> Photoionization detector. Calibration: Daily logged field calibration using a <br /> isobutylene standard as per manufacturers instructions. <br /> • Groundwater pH Measurement - <br /> Digital pH meter. Calibration: standard pH solutions of 4,7, and 10 will be <br /> utilized for daily logged field calibration according to manufacturers instructions. <br /> • Electrical Conductivity - <br /> Electrical conductivity meter. Calibration: factory-calibrated annually and <br /> periodically calibrated against laboratory prepared standard calibration solution. <br /> • Water Temperature - <br /> Mercury or digital thermometers. Calibration: one-time factory-calibrated. <br /> • Combustible Gas/Oxygen - <br /> Combustible gas/oxygen meter calibration: Factory calibrated, field calibrated <br /> monthly, zeroed daily according to manufacturers instructions. <br /> • Other Field Instumentation or Equipment - <br /> Calibration procedures for any other instumentation or equipment used will be <br /> documented at the request of the client or regulatory authority. <br /> All equipment will be checked daily and replaced as necessary. Instrument manuals and an <br /> instrument log book will accompany equipment into the field. Any calibration, repairs or related <br /> information will be recorded in the log book. <br />