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r d 11 January 2007 AGE-NC Project No. 00-0769 Page 3 of 8 • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method 8015 Modified; and • Benzene, toluene, ethylbenzene, and total xylenes (BTEX) and the fuel additives methyl tertiary-butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), tertiary-butyl alcohol (TBA), 1 ,2-dibromoethane (EDB), 1 ,2-dichloroethane ( 1 ,2-DCA) in accordance with EPA Method 826013. Laboratory reports for soil sample analyses, testing methods, laboratory quality assurance/quality control (QA/QC) reports, and sample chain of custody documentation will be presented in a report with the findings and recommendations. The soil pilot boring locations are illustrated in Figure 2. The scope of work for the installation of the well network includes the following: • Installation of three, 4-inch diameter ground water extraction wells, completed to extract ground water from HU- 1 for interim remediation of the core contamination areas (approximately 50 feet total depth) . • Installation of one, 4-inch diameter ground water extraction well, completed to extract ground water from HU-2 for interim remediation of the core contamination area (approximately 120 feet total depth) . Following installation, the well will be developed to maximize water flow into the well and minimize the amount of fine-grained sediment drawn into the well during pumping or bailing. Procedures for well installation and development are presented in Sections 3 . 1 . and 3 .2 , respectively. 2.3 . INSTALLATION OF REMEDIATION PIPING SYSTEM One-inch diameter, schedule 80 PVC piping (process piping) will be installed below ground and maybe installed adjacent to soil vapor extraction piping. The belowground piping will be installed in trenches approximately 1 '/2-feet deep and 1 -foot wide. The piping will be routed from each ground water extraction well head to the ground water treatment system; 1/4-inch diameter, schedule 80 PVC electrical conduit will be installed in the same areas as the one-inch diameter, schedule 80 PVC piping and routed from each well head to an electrical control panel with integrated fuses . Following piping placement the trenches will be backfilled with imported road-base sand, capped with native soil, compacted and covered with concrete or asphalt. A plan view drawing of the piping network is depicted in Figure 2 . Advanced GeoEnvironmental, Inc.