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7.0 FIELD EQUIPMENT CALIBRATION AND MAINTENANCE <br /> The following measuring equipment may be used during the Remedial Investigation. Equipment <br /> is grouped by field activity. Calibration procedures and frequency are listed for each piece. <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 /> - <br /> Photoionization detector. Calibration: Daily logged field calibration using a <br /> isobutylene standard as per manufacturers instructions. <br /> • Groundwater pH Measurements- <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/Oxpgen- <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 /> 8.0 LABORATORY QA/QC PLAN <br /> Soil and groundwater samples will be submitted to a State Certified Hazardous Waste Laboratory <br /> for chemical analysis of hazardous constituents. Established QA/QC procedures for analytical <br /> operations will include sample custody procedures, standards of analytical accuracy, analysis of <br /> matriz spikes and method data, and maintenance of control charts to monitor analytical <br /> performance. These QA/QC procedures are outlined in the laboratory QA/QC Plan which is <br /> available upon request. Organic chemical analyses will be performed in conformance with <br /> standard procedures established by the United States Environmental Protection Agency (EPA) <br /> in "Guidelines Establishing Test Procedures for the Analysis of Pollutants Under the Clean <br /> Water Act" (40 CFR Part 136, October 1984). The laboratory is periodically evaluated through <br /> 4 <br />