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i <br /> Groundwater pH Measurement- Digital pH meter. Calibration: <br /> standard pH solutions of 4, 7, and 10 will be utilized for <br /> daily field calibration. <br /> Electrical Conductivity- Electrical conductivity meter. <br /> Calibration: factory-calibrated annually and periodically <br /> calibrated against laboratory prepared standard calibration <br /> solution. <br /> Water Temperature- Digital thermometers. Calibration: <br /> factory-calibrated once. <br /> Combustible Gas/oxygen- Combustible gas/oxygen meter <br /> calibration: Factory calibrated, field calibrated monthly, <br /> zeroed daily. <br /> Miscellaneous Measuring Devices- Calibration procedures for <br /> any other measuring device used will be documented at the <br /> request of the regulatory authority. <br /> All equipment will be checked daily and replaced as <br /> necessary. Instrument manuals and an instrument log book <br /> will accompany equipment into the field. Any calibration, <br /> repairs or related information will be recorded in the log <br /> book. <br /> 6.0 Laboratory QA/QC Plan <br /> Soil and groundwater samples will be submitted to a State <br /> Certified Hazardous Waste Laboratory for chemical analysis <br /> of hazardous constituents. Established QA/QC procedures for <br /> analytical operations will include sample custody <br /> procedures, standards of analytical accuracy, analysis of <br /> matrix spikes and method blanks , data reduction, <br /> verification of raw analytical data, and maintenance of <br /> control charts to monitor analytical performance. These <br /> QA/QC procedures are outlined in the laboratory QA/QC Plan <br /> which is available upon request. Organic chemical analyses <br /> 41 will be performed in conformance with standard procedures <br /> established by the United States Environmental Protection <br /> Agency (EPA) in "Guidelines Establishing Test Procedures for <br /> the Analysis of Pollutants Under the Clean Water Acte (40 <br /> CFR Part 136 , October 1984 ) . The laboratory is <br /> periodically evaluated through external performance audits <br /> conducted by EPA and DHS using QC labs . The specific <br /> analytical methods to be utilized for purgeable and <br /> semivolatile hydrocarbons analyses are shown on Table 2. <br /> Provided the data base is of sufficient size, statistical <br /> techniques may be employed for data validation. <br />