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disallows further migration of the plume of-site The captured groundwater is then treated with liquid-phase activated carbon prior to discharge to the local sanitary sewer The system has been designed to operate automatically on a constant basis, 24-hours per day, 7-days p e r week The basic components of the system are depicted on Figure 1 a n d are as follows 3. 1 Czroundwater Recovery Well Groundwater is extracted from (5) 2-inch diameter recovery wells spaced ' approximately 25-feet to 30-feet from each other Three of the recovery wells (RW-2, RW-4 and RW-5) already existed at the site as piezometers P- 2, P-3 and P-5 Two additional recovery wells RW-1 and RW-3 were installed on September 15, 2000 The depth of each of these wells is approximately 19-feet below ground surface (bgs), and are screened ' between 9-feet bgs and 19-feet bgs The plumbing required to deliver the extracted groundwater from the ' recovery wells to the treatment system was installed by ASE and its subcontractor Crutchfield Construction on September 21 and 22, 2000 Each well head was constructed to accept a 1-inch diameter, schedule 80 liePVC suction stinger whose inlet is positioned 6-inches from the bottom of the well casing It is this stinger that delivers the groundwater to the remediation system Each well is secured at the surface with a traffic rated well box 3. 2 Groundwater Extraction_P_umi2ing S, sv tem The groundwater is extracted from the five recovery wells using the EconoPump multi-well jet system (Appendix C) This system uses a liquid- driven het pumping system in which water is continuously circulated at 40 ' psi through multiple venturis to create a vacuum at each jet inlet port in the Multi-Jet Manifold The buried 1-inch diameter schedule 80 PVC piping is used to extract the groundwater from each recovery well and ' deliver it to the system As detailed above, the groundwater extraction point is occuring at the depth the extraction piping "stinger" is installed within each recovery well The extraction rate, which is adjustable within ' the treatment compound, has been set at approximately 2 gallons p e r minute (gpm) from each recovery well This pumping rate was computed ' based on the performance of the constant rate and step-drawdown tests conducted at the site several months ago At this pumping rate, t h e . system is capable of achieving a radius of influence for each recovery well ' of no less than 20-feet Frank's One Stop Interim Remediation System Installation Report — October 2000 ' -2-