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I <br /> GROUND ZERO ANALYSIS,INC. <br /> FIELD PROCEDURES FOR <br /> GROUNDWATER MONITORING AND SAMPLING <br /> • Groundwater pH Measurements-Digital pH meter. Calibration: standard pH <br /> solutions of 4, 7, and 10 utilized for daily logged field calibration and/or according <br /> to manufacturer instructions. <br /> • Electrical Conductivity-Electrical conductivity meter. Calibration: factory- <br /> calibrated initially and periodically calibrated against laboratory prepared standard <br /> calibration solution. <br /> • Water Temperature-Mercury or digital thermometers. Calibration: one-time <br /> factory-calibrated. <br /> Laboratory Quality Assurance/Quality Control <br /> Samples are submitted to a State-certified laboratory for chemical .analysis. Established QA/QC <br /> procedures for analytical operations include sample custody procedures, standards of analytical <br /> accuracy, analysis of matrix spikes and method data, and maintenance of control charts to monitor <br /> analytical performance. Organic chemical analyses are performed in conformance with standard <br /> procedures established by the United States Environmental Protection Agency (EPA) in <br /> "Guidelines Establishing Test Procedures for the Analysis of Pollutants Under the Clean Water <br /> Act" (40 CFR Part 136, October 1984). Laboratories are periodically evaluated through external <br /> performance audits conducted by EPA and DHS using QC labs. <br /> G:\GROUNDZE\QAQC\FLDQM.DOC <br />