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ATC Associates Inc. <br /> Quality Assurance/Quality Control Plan,f Revised March 1998 <br /> All equipment will be checked daily and replaced as necessary. Instrument manuals and an instrument <br /> log book will accompany equipment into the field. Any calibration, repairs or related information will <br /> be recorded in the log book. <br /> 8.0 LABORATORY QA/QC PLAN <br /> Soil and groundwater samples will be submitted to a State Certified Hazardous Waste Laboratory for <br /> chemical analysis of hazardous constituents. Established QA/QC procedures for analytical operations <br /> will include sample custody procedures, standards of analytical accuracy, analysis of matrix spikes and <br /> method blanks, data reduction, verification of raw analytical data, and maintenance of control charts to <br /> monitor analytical performance. These QA/QC procedures are outlined in the laboratory QA/QC Plan <br /> which is available upon request. Organic chemical analyses will be performed in conformance with <br /> standard procedures established by the United States Environmental Protection Agency (EPA) in <br /> "Guidelines Establishing Test Procedures for the Analysis of Pollutants Under the Clean Water Act" <br /> (40 CFR, Part 136, October 1984). The laboratory is periodically evaluated through external <br /> performance audits conducted by EPA and DHS using QC labs. The specific analytical methods to be <br /> utilized for purgeable and semivolatile hydrocarbons analyses are shown on Table 2. <br /> Provided the database is of sufficient size, statistical techniques may be employed for data validation. <br /> 9.0 GROUNDWATER MONITORING PROTOCOL <br /> Monitoring of depth to water and free product thickness within wells at the site will be conducted using <br /> an Interface Probe or Conductivity Meter. For consistency, all measurements will be taken from the <br /> north side of the wellhead at the survey mark. To assess potential infiltration of fine-grained sediments, <br /> total well depth will also be sounded. <br /> W:\Admin\Shells\QAQC-98.DOC <br />