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as .�r s, �" -tit -. f?-3x a '�r!'ic�."'.. .� .' „r•^ e � � Rte" 3. TECHNICAL APPROACH 3. 1 TASK I - INITIAL FIELD TESTS AND SYSTEMS DESIGN The soil vapor petroleum hydrocarbon conc©ntratlonn from the coil vapnr extraction wells and the soil vapor transmiaaivity wore testae! on 24 April 1969, as discussed above in Chapter 1 . The VETS unit installation outlined in this proposal is based on that initial field toot. 3.2 TASK II - VETS PERMITTING AND INSTALLATION The five onsito vapor extraction wells V1 , V2, V3, V4, and V5 will be plumbed to a central point in the approximate center of the 5 wells, using 2-inch diameter PVC pipe (Figure 3). The five w wells will be manifolded to a Haastecr Mult1mode combustor unit consisting of ( 1 ) a 100-cfm vacuum compzossor unit (CU) which induces the air flow through the eontaminat,ld soil via the vapor extraction wells, (2) a vapor control procaaror (VCP), an incin- erator in which the extracted hydrocarbon vapors are burned abovo gaa jets, and (3) a catalytic reactor (CAR) where the remaining lov-concentration hydrocarbon vapors are catalyzed to purity with essential'v 99.9 percent efficiency. The Hasstech Hultimode combustor specifications and description are included as Appendix 8, The CU, VCP, and CAR units will be mounted on a 6-foot by 15-fact concrete slab located as shown in Figure 4. Power will be brought onsite from existing utility linen and run Underground to the VETS. The flow line from each vapor extraction wgll will contain a shut-off valve to restrict or completely shut off vapor flow, a vacuum gauge to measure in-line flow vacuum, a flow meter to _.__... sure-the_amount-of.-vapor---f;loving-through-the s tats,--and-a ----- -- ------ aample port for collection of vapor samples. This system configuration is shown in Figure 5. c$2/91918/text 5