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'l� tta <br /> 23 April 2002 <br /> AGE-NC Project No 95-0142 <br /> Page 6 of 16 <br /> Occupational Safety and Health Administration, U S Coast Guard and U S Environmental <br /> Protection Agency, 1985) Prior to digging/drilling activities,each proposed digging/drilling location <br /> will be clearly marked and an underground utility clearance obtained through Underground Service <br /> Alert <br /> 3 2 INSTALLATION OF REMEDIATION WELLS <br /> AGE proposes to install four additional, six-inch diameter ground water extraction wells along the <br /> eastern edge of the yard (Figure 2), down-gradient of the area of highest-known ground water <br /> contamination Based on the distribution of hydrocarbon-impacted ground water detected in samples <br /> from the monitoring wells on the site,AGE proposes that three of the ground water extraction wells <br /> along the eastern edge of the yard be located approximately 20 feet apart (See Figure 2) The <br /> extraction wells will be screened from 30 to 60 feet bsg to address the more permeable zone <br /> (between 25 and 50 feet bsg), which contained the most intensely impacted ground water <br /> Following installation,the extraction wells will be developed to maximize water flow into the wells <br /> . and minimize the amount of fine-grained sediment drawn into the wells dunng pumping or bailing <br /> Procedures for well installation and development are presented in Sections 4 3 to 4 4 ,respectively <br /> The soil borings for the ground water extraction wells will be advanced with 12-inch hollow-stem <br /> augers All augers will be cleaned prior to advancement in each boring location <br /> 33 WELL PUMPS, INSTALLATION AND PROCESS PIPING <br /> It is anticipated that type 5E5 Grundfos Rediflow down-well pumps equipped with Franklin 1/3 hp, <br /> 230 volt,3-wire motors,will be installed in the new ground water extraction wells and in the existing <br /> four-inch diameter wells A one-inch diameter, Schedule 40, PVC pipe will be installed from the <br /> pump discharge to the surface <br /> This well system is rated to remove up to five gallons of water per minute (gpm) To minimize <br /> sediment intake through the pump, the bottom of each pump/motor assembly will be suspended <br /> approximately 2 feet from the extraction well bottom, a safety chain will be attached to the pump <br /> to prevent it from dropping to the well bottom Electrical wiring will be connected from the top of <br /> the pump through Class I electrical connectors/Junction boxes and a electrical conduit to the pump <br /> controller <br /> Advanced GeoEnvironmental,Inc <br />