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8 <br /> Combustible Gas/Oxygen- Combisstible 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 /> s of hazardous constituents. Established QA/QC procedures for <br /> analytical operations will include sample custody <br /> t procedures, standards of analytical accuracy,'' nnalysis 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 /> X 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 Frotection <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 /> y u; Provided the data base is of sufficient size, statistical <br /> techniques may be employed for data validation. <br /> 9.0 Groundwa•tl:er 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 tV.a <br /> wellhead at the survey mark. To assess potential s <br /> Jinfiltration of fine grained sediments, total well depth <br /> will, also.be..sounded. <br /> .. <br /> f <br /> =RWININMIMMI OR <br />