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i 1 +9 • 07 December 2001 AGE Project No 96-0232 Page 5 of 9 52 INSTALLATION OF OFF-SITE REMEDIATION WELLS An off-site ground water extraction system to operate concurrently with on-site treatment is proposed to reduce the volume and concentrations of MTBE-impacted ground water off-site In order to maximize the efficiency of the clean-up efforts,a 24-hour operation of the on-site and off-site ground water extraction and treatment system is anticipated Three additional off-site ground water extraction wells will be installed to augment the current remediation efforts The proposed ground water extraction well locations are illustrated in Figure 3 Based on an estimated radius of influence of 25 feet for each extraction well in the First Water Zone (Final Remediation Plan, dated 31 August 2000), AGE proposes installation of ground water extraction wells in the following locations • Approximately 10 to 20 feet east-northeast of Rocky's Restaurant domestic water well, • Approximately 5 to 15 feet south-southwest of Rocky's Restaurant domestic water well, and • Approximately 10 to 20 feet west of well Flag City Chevron monitoring well MW-7 • 5 3 INSTALLATION OF OFF-SITE REMEDIATION SYSTEM PIPING SYSTEM Two-inch diameter, schedule 80 PVC piping (process piping) will be installed in trenches approximately 1%z-foot bsg deep and i-foot wide and routed from each off-site ground water extraction well head to the Flag City Chevron ground water treatment system, one-inch diameter electrical conduit will be installed in the same trench and routed from each well head to an electrical fuse box located at the Flag City Chevron ground water treatment system Individual sample ports with check valves to prevent back-flow cross contamination will be installed at each of the three ground extraction well process piping risers These ports allow sampling of each well independently without having to remove the well head assembly Following piping placement the trenches will be backfilled with imported road-base sand, compacted and covered with asphalt A cut view drawing of the process piping layout is included in Figure 6, a plan view drawing of the piping network is depicted in Figure 2 54 WELL PUMPS, INSTALLATION AND PROCESS PIPING Grundfos Rediflow down-well pumps, type 5E5, equipped with Franklin 1/3 hp, 230V, 3-wire motors will be installed in the three newly installed ground water extraction wells One-inch idiameter Schedule 40 PVC pipe will be installed from the pump discharge to the well-head surface Advanced GcoEnvironmental,Inc