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A7 U q <br />. Quality Assurance/Quality Control Plan Page 5 <br /> • oil Borings and Well Dimensi ns - <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 Electncal well sounders <br /> Calibration check against steel surveyor's tape <br /> • <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-tame factory-calibrated <br /> • Combustible Gas/Oxygen - <br /> Combustable gas/oxygen meter calibration- Factory calibrated, field calibrated <br /> monthly, zeroed daily according to manufacturers instructions. <br /> • Other Field Instumentation or-Equipment - <br /> Calabration procedures for any other anstumentation 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 an the log book <br />