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31 March 2000 <br /> AGE-NC Project No. 00-069.9 _ <br /> Page 5 of 9 <br /> 3.3. GRAB GROUND WATER SAMPLE COLLECTION AND ANALYSIS <br /> During the soil assessment activities,one."grab"ground water sample will be collected from selected <br /> borings and will be submitted for laboratory analysis. Ground water sample collection procedures <br /> are presented in Section 4.2. Ground water samples will be analyzed by a DHS-certified laboratory <br /> for: <br /> • TPH-g and TPH-d by EPA Method 8015 Modified; <br /> • BTEX by EPA Method 8020; <br /> • Fuel oxygenates, 1,2-DCA and EDB, by EPA Method 8260 Modified; and <br /> • Total lead by EPA Method 6010 <br /> The laboratory report for the ground water analyses, testing methods, laboratory quality <br /> assurance/quality control (QA/QC) reports, and sample chain-of-custody documentation will be <br /> presented in a report with the findings and recommendations. <br /> 3.4. MONITORING WELL INSTALLATION AND.SAMPLING <br /> If the results of the initial soil and ground.water assessment activities indicate significant petroleum <br /> hydrocarbon.impaction to ground water, the three borings may be completed as ground water <br /> monitoring wells. The monitoring wells will provide repeatable sampling points for monitoring of <br /> petroleum hydrocarbon impacted groundwater and allow determination of site-specific ground water <br /> flow direction. <br /> 3.4.1. Monitoring Well Installation and Development <br /> Following advancement of borings,two-inch diameter monitoring wells will be installed in each of <br /> the borings. Ground water monitoring wells will consist of 20 feet of well screen section. The well <br /> screen section will be installed across the observed water table level with approximately five feet of <br /> screen section extending above the water level and 15 feet of screen section extending below the <br /> water table level. Based on ground water table level, it is anticipated that the total depth of the <br /> monitoring wells will be approximately 70 feet bsg. <br /> Following well installation, the wells will be developed in order to maximize water flow into the <br /> well and minimize the amount of fine-grained sediment drawn into the well during sampling <br /> activities. Field procedures for monitoring well installation and development are presented in <br /> Advanced GeoEnviron mental,Inc. <br />