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JUL 2 91 16 : 49 FRENVIRONMENTAL Si- I ENG PPGE . OL17 C-S HAD RI FS91.2/VES WP.7 DCS/18/91 above the sand pack to a thickness of 5 ft. Concrete will then be poured from the top of the bentonite to the surface. The vapor well will be fitted with a slip cap, and the entire well assembly will be enclosed at the surface by a cast iron traffic rated vaultbox cemented in place. 7. The wells will be installed under the supervision of qualified ESE personnel, who may elect to change the screened intervals based on the results of the soil borings taken from the first VEW installati9n. The purpose of alternating the screened intervals is to monitor the effects of vapor extraction at different depths and through different soil types. South Balloon Area (Soil Area 8) 1. The three VF,Ws in Soil Area 8 will be installed at intervals of 301t along a horizontal line. The first VEW will be installed approximately 70 ft southeast of monitor well 425 (see Fig. 2-5). ' 2. The two VMWs will also be installed at intervals of 30 ft on a 90-degree radial from the VEWs (see Fig. 2-5). 3. The three VEWs will be labeled VEW 1-8, VEW 2-8, and VEW 3-8. _ The two VMWs will be labeled VMW 1 and VMW 2 (see Fig. 2-5). ' 4. Soil samples will be collected every 2.5 ft in the first boring to verify the subsurface stratigraphy encountered in the pilot test area. S. Based on expected subsurface stratigraphy developed during the remedial investigation, the VEWs and VMWs will be installed as outlined in Table 2-1 and Figs. 2-6 and 2-7. 6. All lengths of pipe, both slotted and blank, will be connected by threaded joints. No glues or adhesives will be used. 2-10