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t• 11 March 2002 AGE-NC Project No. 95-0130 ' Page 7 of 13 ' to 20 feet south of MW-1 and screened between 35 and 55 feet bsg; • One 2-inch diameter ground water monitoring well (MW-9) located approximately 80 to 100 feet northwest of MW-1 and screened between 35 and 55 feet bsg; • One 2-inch diameter multi-level ground water monitoring well (MW-10) located approximately 140 to 160 feet north-northeast of MW-5 and screen intervals at depths ' between 35 and 45 feet bsg(A),50 and 55 feet bsg(B), 70 and 75 feet bsg(C), 100 and 110 feet bsg (D) and between 125 and 142 feet bsg (E); ' One 2-inch diameter multi-level ground water monitoring well (MW-11) located approximately 130 to 150 feet northeast of MW-3 and screen intervals at depths between 35 and 45 feet bsg(A), 50 and 55 feet bsg(B), 70 and 75 feet bsg(C), 100 and 110 feet bsg ' (D) and between 125 and 145 feet bsg(E); • One 2-inch diameter multi-level ground water monitoring well (MW-12) located approximately 70 to 90 feet east of MW-3 and screen intervals at depths between 35 and ' 45 feet bsg(A),50 and 55 feet bsg(B),70 and 75 feet bsg(C), 100 and 110 feet bsg(D)and between 125 and 142 feet bsg(E); and '• 0 One 2-inch diameter multi-level ground water monitoring well (MW-13) located approximately 90 to 110 feet southeast of MW-6 and screen intervals at depths between 35 and 45 feet bsg(A), 50 and 55 feet bsg(B), 70 and 75 feet bsg(C), 100 and 110 feet bsg ' (D) and between 125 and 142 feet bsg (E). Proposed well locations are depicted in Figure 2; general soil distribution beneath the site is depicted in cross sectional views B-B'in Figures 3.AGE has developed a preliminary subsurface model of the site soil stratigraphy comprised of a vadose(unsaturated)zone and four hydrological ' units (Multi-Level Monitoring Well Installation Report, dated 01 March 2002). The proposed ground water extraction, SVE and IAS wells will be screened through Vadose Zone and Hydrologic Unit No. 1 (HUI) and in areas of known petroleum-impacted soil and ground ' water.The proposed ground water monitoring wells MW-8 and MW-9 will be screened through HU1 ground water and to delineate the southwest and northwest extent of petroleum-impacted ground water. The proposed ground water monitoring wells MW-10, MW_11, MW-12 and ' MW-13 will be screened to delineate the vertical and later extent of off-site petroleum-impacted ground water. Procedures for well installation are presented in Section 4.2. ' Following well installation,each water well will be developed to maximize water flow into the well and minimize the amount of fine-grained sediment drawn into the well during pumping or bailing. Procedures for well installation and development are presented in Sections 4.2 and ' 4.3, respectively. Advanced GmEnvironmental,Inc.