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10 October 1999 <br /> AGE-NC Project No. 99-0559 <br /> Page 4 of 8 <br /> borings, if possible. In-situ ground water sample collection procedures are presented in Section 4.2. <br /> Selected groundwater samples will be analyzed by a DHS-certified laboratory for the following <br /> constituents: <br /> • TPH-g by EPA Method 8015 Modified/5030; <br /> • TPH-d by EPA Method 8015 Modified/3550; <br /> • BTEX and MTBE by EPA Method 8020; and <br /> • Fuel oxygenating compounds including MTBE, DIPE, ETBE, TAME and TBA by EPA <br /> Method 8260. <br /> Laboratory reports for ground water analyses, testing methods, laboratory quality assurance/quality <br /> control (QA/QC) reports, and sample chain of custody documentation will be presented in a report <br /> with the findings and recommendations. <br /> 1.4. MONITORING WELL INSTALLATION AND SAMPLING <br /> _ The proposed monitoring wells will provide repeatable sampling points for the monitoring of impact <br /> to ground water and allow determination of site-specific ground water flow direction. The procedures <br /> for soil sampling, in-situ ground water sampling, and monitoring well installation are presented in <br /> Section 4.1., Section 4.2., and Section 4.3., respectively. <br /> 3.4.1. Monitoring Well Installation and Development <br /> Following completion of the pilot borings, two-inch diameter monitoring wells will be installed in <br /> each of the borings. Ground water monitoring wells will consist of 20 feet of well screen section. <br /> The well screen section will be installed across the observed water table level with five feet of screen <br /> section extending above the water level and fifteen feet of screen section extending below the water <br /> table level. Based on available information, it is anticipated that the total depth of the monitoring <br /> wells will be approximately 25 feet bsg. Monitoring wells will be completed as described in Section <br /> — 4.4. <br /> Following well installation, the wells will be developed to maximize water flow into the well and <br /> minimize the amount of fine-grained sediment drawn into the well during purging for monitoring <br /> events. Field procedures for monitoring well installation and development are presented in Sections <br /> 4.3 and 4.4, respectively. <br /> Advanced GeAnN ironmenlai.Inc. <br />