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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 /> s. <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/OC 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 0A/QC procedures for <br /> analytical operations will include sample custody <br /> procedures, standards of analytical accuracy, analys:.s o: <br /> matrix spikes and method blanks, data redu=ticn, <br /> verification of raw analytical data, and maintenance of <br /> control charts to monitor analytical performance. Thesa <br /> QA/0C procedures are outlined in the laboratory QA/0C 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 spe"fie <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 /> r 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 consiste v, all <br /> measurements will be taken from the north side the <br /> wellhead at the survey mark. To assess po..:ntial <br /> infiltration of fine grained sediments, total well depth <br /> will also be sounded. <br />