SITE INFORMATION AND CORRESPONDENCE

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Quality Assurance/Quality Control Plan Page 5 • 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 Measurement - 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. • Other Field Instumentation or Equipment - Calibration procedures for any other instumentation or equipment used will be documented at the request of the client or regulatory authority. All equipment will be checked daily and replaced as necessary. Instrument manuals and an instrument log book will accompany equipment into the field. Any calibration, repairs or related information will be recorded in the log book.