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Combustible Gas, OX en- Combustible gas oxygen meter <br /> • calibration Factorl calibrated, field calibrated monthly, <br /> zeroed daily according to manufacturers instructions. <br /> Miscellaneous Measuring Devices Calibration procedures for <br /> any other cneasur:-ng device used will be documented at the <br /> request of the regulatory authority. <br /> All equipment 4ill be checked daily and replaced as <br /> necessary. Instrument manuals and an instriment 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 Labcratory QA/QC Plan <br /> Soil and groundwater samples will be submitted to a State <br /> Certified Hazardous :haste Laboratory for chemical analysis <br /> of hazardous constituents. Established QA, QC procedures for <br /> analytical operations will include semple 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 EPzk 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 /> p1r©vid9d thg 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 /> A wellhead at the survey mark. To assess potential <br /> infiltration of fine grained sediments, total well depth <br /> will also be sounded. <br />