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1 <br /> pir <br /> Working To Restore Nature <br /> Due to the inherent limits of small diameter pumps such as that used in the aquifer pump test, <br /> an accurate estimation of the effective radius of influence induced by a single groundwater <br /> ' extraction well and, thus, final design parameters of a GWTS can not be made at this time. <br /> However, initiating groundwater extraction from a single, 4-inch or larger diameter, extraction <br /> ' well would exert some hydraulic control in the heart of the dissolved contaminant plume and <br /> allow for the determination of an effective radius of influence of the extraction well Additional <br /> ' extraction wells could be installed and brought on line as necessary. GWTS design would <br /> necessarily be somewhat flexible allowing for substantial expansion An analysis of the aquifer <br /> ' pump test data suggests that the impacted aquifer could yield as much as 15 to 40 gpm, which <br /> should be sufficient to exert hydraulic control beneath the site. <br /> The major components of the GWTS are 1) down-hole extraction pumps and associated on/off <br /> ' sensors; 2) subgrade double-contained supply piping; 3) treatment system compound and <br /> concrete pad; 4) liquid phase granular activated carbon canisters, S) associated valves and <br /> instrumentation; and 6) discharge and/or reinfection piping. The GWTS could be placed in any <br /> advantageous Iocation within the general proximity of the extraction well(s). <br /> 1 <br /> ' 10.0 PROPOSED SCOPE OF WORK <br /> 10.1 System Design <br /> The design of the GWTS should include engineering calculations, a list of equipment, materials, <br /> ' and instrumentation; preparation of construction Plans and Specifications including site and <br /> ' remediation compound layouts; trench and section details if appropriate; wellhead piping details; <br /> a process and instrumentation diagram (P&ID), and plan check and review <br /> ' <br /> 10.2 System Permittin <br /> � <br /> ' A minimum of three permits will be required for the proposed system- a City Building/Planning <br /> Permit, a City Fire Department Permit, and a discharge permit. <br /> 1 <br /> ss000sMEPORTS cAP-0794 DRF 23 <br /> 1 <br />