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1 I ec'fic inR12 - 1 i 4.12 Pilot test duration would be approximately ane week or unttil four carbon canisters have been exhausted,whichever occurs first. Approximately one week would be required to set up the pilot test system. If carbon is exhausted within a few days,data would be evaluated. This pilot test Work Plan would be revised as necessary,including evaluation of alternative air pollution control technology. 5.0 Int ct ton a��..extraction Well Installati n 5.1 Design of a soil treatment cell, extending from site surface to the water table approximately seventy feet (70') below grade, would be based on results of the Pilot Test. Figure B-1 presents a schematic diagram of a typical vapor well which would be in for both extraction and passive air injection. Design of the well field would be based on the results of the pilot test and evaluation of the W' lateral and vertical extent of soil contamination. Construction of the well field could proceed subsequent to the pilot test and concurrently with the assessment investigation (i.e. from the soil borings drilled for installation of the wells and manometer points). t 5,2 i r i n f Vad Z n Air Well Vadose zone air wells would be installed, if necessary, and constructed to mirAmize distances between passive injection and extraction points. Minimization of air travel distance increases control of airflow rates and vacuums and, consequently, remediation process.control and predictability. n. To promote air fir)w through the treatment cell, air intake and extraction points would be stratifed as follows: Straka 1 15, to 45' ,w Strata 2 45' to 75' (approximate depth of water table) 5.3 YY§ll COWM0119—n At each air-well location, two eight-inch diameter boreholes would be drilled ted that one well would be installed to a adjacent to one another. It is anticipa depth of approximately 63 feet and the second well to a depth of approximately 30 feet. For a maximum well depth, the borehole would be advanced from the soil surface to the lower unit of air release or withdrawn!(at about 65 feet below grade of the water table capillary fringe). Vadose wells would end above the e to minimize the yield of free and condensate water aquifer free water surfac borehole to its final depth,the borehole mixed systems. After completion of the would be partially backfilled with a natural well packing material (sand, pea _ stone, gravel, etc.) to be selected after site soil evaluation. The lower vertical air conduit would be placed on the backfill with its upper end - approximately two feet above grade(until shortened during air conduits network ing would be added until the packing reaches construction). Additional well pack REM EdiATiON - B-5 INC. SERVICES. i