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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 />will also be sounded. <br />