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Combustible Gas/Oxygen- Combustible gas/oxygen meter <br /> calibration: Factory calibrated, field calibrated monthly, <br /> zeroed daily according to manufacturers instructions. <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 /> ' 8.0 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 /> 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 Act" (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 /> 9.0 Groundwater Monitoring Protocol <br /> ' Monitoring of depth to water and free product thickness <br /> within wells at the site will be conducted using an <br /> Interface Probe or conductivity meter. For consistency, all <br /> ' measurements will be taken from the north side of the <br /> wellhead at the survey mark. To assess potential <br /> infiltration of fine grained sediments, total well depth <br /> 1 will also be sounded. <br />