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ATC Associates Inc. <br /> Quality Assurance/Quality Control Plan 1 <br /> Revised March 1998 <br /> All equipment will be checked daily and replaced as necessary. Instrument manuals and an <br /> instrument log book will accompany equipment into the field. Any calibration, repairs or related <br /> information will be recorded in the log book. <br /> i <br /> 8.0 LABORATORY QA/QC PLAN <br /> Soil and groundwater samples will be submitted to a State Certified Hazardous Waste Laboratory <br /> for chemical analysis of hazardous constituents. Established QA/QC procedures for analytical <br /> operations will include sample custody procedures, standards of analytical accuracy, analysis of <br /> matrix spikes and method blanks, data reduction, verification of raw analytical data, and <br /> maintenance of control charts to monitor analytical performance. These QA/QC procedures are <br /> outlined in the laboratory QA/QC Plan which is available upon request. Organic chemical analyses <br /> will be performed in conformance with standard procedures established by the United States <br /> Environmental Protection Agency (EPA) in "Guidelines Establishing Test Procedures for the <br /> Analysis of Pollutants Under the Clean Water Act" (40 CFR, Part 136, October 1984). The <br /> laboratory is periodically evaluated through external performance audits conducted by EPA and <br /> DHS using QC labs. The specific analytical methods to be utilized for purgeable and semivolatile <br /> hydrocarbons analyses are shown on Table 2. <br /> Provided the database is of sufficient size, statistical techniques may be employed for data <br /> 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 <br /> using an Interface Probe or Conductivity Meter. For consistency, all measurements will be taken <br /> W:\Admin\Shells\QAQC-98.D0C <br /> 7 <br /> i <br /> i <br />