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• GROUND ZERO ANALYSIS,INC, <br /> FIELD PROCEDURES FOR <br /> GROUNDWATER MONITORING AND SAMPLING <br /> • Groundwater pH Measurements-Digital pH meter Calibration standard pH solutions <br /> of 4,7, and 10 utilized for daily logged field calibration according to manufacturer <br /> instructions <br /> • Electrical Conductivity-Electrical conductivity meter Calibration factory-calibrated <br /> annually and periodically calibrated against laboratory prepared standard calibration <br /> solution <br /> • Water Temperature-Mercury or digital thermometers Calibration one-time factory- <br /> calibrated <br /> Laboratojy QiWily 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, analysts of matrix spikes and method data, and maintenance of control charts to monitor <br /> analytical performance Organic chemical analyses were performed in conformance with standard <br /> • procedures established by the United States Environmental Protection Agency (EPA) in "Guidelines <br /> Establishing Test Procedures for the Analysis of Pollutants Under the Clean Water Act" (40 CFR Part <br /> 136, October 1984) Laboratories are periodically evaluated through external performance audits <br /> conducted by EPA and DHS using QC labs <br /> • <br />