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Treatability Study Report and Feasibility Evaluation for In Situ Petroleum Hydrocarbon Remediation Field Maintenance Shop #24, 8020 South Airport Way The test at well FMS-MW5 was performed at conditions ranging from an initial vacuum of 15 in. Hg to a final vacuum of 3 in. Hg resulting in vapor flow rates ranging from 40 to 12 scfm, respectively. Well FMS-DPE1 was tested at vacuums ranging from 108 to 10 in. w.c. resulting in flow rates ranging from 123 to 14 scfm, respectively. Extracting vapor from well FMS-MW5 required significantly higher applied vacuums than FMS-DPE1 likely due to the variations in screened intervals and subsurface lithology between the two wells. The top of the screen in well FMS-MW5 is at 27.5 feet bgs, approximately 2.5 feet below the sand interval which was encountered between 20 and 25 feet bgs. The screen in well FMS-DPE1 extends from 20.1 to 60.1 feet bgs, intercepting the entire upper sand interval and thus lowering the vacuum required to extract soil vapor. 5.3.2. Depth to Water Monitoring Monitoring of depth to water during HVDPE testing at wells FMS-MW5 and FMS-DPE1 did not reveal drawdown in monitoring wells located at distances ranging from 16 to 189.23 feet from the test well. Depths to water were observed to decrease (rise in water level) during HVDPE testing, likely due to the vacuum applied to the vadose zone. Changes in depth to water during HVDPE testing are summarized in Appendix F. 5.3.3. Induced Vacuum Measurements During the HVDPE testing at FMS-MW5, induced vacuum measurements were recorded from six monitoring wells. The following changes in wellhead vacuum were observed during the FMS MW5 HVDPE test: • Vacuum in well FMS-SVE1 (20.96 feet from FMS-MW5) increased from 0.0 to 1.50 in. w.c. by the end of testing. • Vacuum in well FMS-DPE1 (22.16 feet from FMS-MW5) increased from 0.0 to 1.35 in. w.c. by the end of testing. • Vacuum in well FMS-DPE2 (31.05 feet from FMS-MW5) increased from 0.0 to 1.75 in. w.c. by the end of testing. • Vacuum in well FMS-MW2 (101.61 feet from FMS-MW5) increased from 0.02 to 0.12 in. w.c. by the end of testing. • Vacuum in well FMS-MW1 (114.18 feet from FMS-MW5) increased from +0.12 in. w.c. (pressure) to 0.10 in. w.c. (vacuum) by the end of testing. • Vacuum in well FMS-MW4 (176.53 feet from FMS-MW5) increased from +0.02 in. w.c. (pressure) to 0.06 in. w.c. (vacuum) by the end of testing. During the FMS-DPE1 HVDPE test, the following changes in wellhead vacuum were observed at the end of testing (near steady state conditions): Vacuum in well FMS-SVE1 (9.33 feet from FMS-DPE1) increased from 0.05 to 4.5 in. w.c. by the end of testing. • Vacuum in well FMS-MW5 (22.16 feet from FMS- DPE1) increased from 0.01 to 0.75 in. w.c. by the end of testing. JI OTIE