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.� Work Plan for Refined Plume Definition and Management of Floating Product-7500 W 1111;St., Tracy, CSI. Page iii 9.4.3 Technology C---Skimming of LNAPL from Extraction Wells........................................67 y.r 9.4.3.1 Pneumatic Skimmer Pump and Holding Tank System............................................67 9.4.3.2 Surface Equipment Enclosure................ ,.,..,69 ............................................................ 9.4.3.3 Air and Discharge Line Conduits.......................:.....................................................70 9.4.3.4 Noise Reduction Housing ..70 ...................................................................................... 9.4.3.5 Electrical Power Supply...........................................................................................70 9.4.3.6 System Operation and Maintenance.........................................................................71 9.4.3.7 System Shut Down.......................... ...71 ...................................................................... 9.4.3.8 ScheduIe...................................................................................................................72 9.4.3.9 Estimated Cost: ........................................................................................................73 iLW 9.4.3.10 Advantages and Disadvantages...............................................................................74 9.5 Recommended Floating Product Removal Technology...........................................................76 10.0 WELL CLOSURES......................................................................................................................77 �,. 10.1 Well Closure Procedure..........................................................................................................77 10.2 Proposed Closure of Existing Wells.......................................................................................77 10.2.1 Schedule................................................................................. ...79 ..................................... 10.2.2 Cost Estimate..................................................................................................................79 11.0 UNDERGROUND UTILITY LOCATION AND PERMITTING...............................................80 11.1 Detection of Underground Utilities........................................................................................80 11.2 Permitting....................................................................................................... ..................80 12.0 PROJECT-SPECIFIC HEALTH AND SAFETY PLAN.............................................................81 .................................... 13.0 REPORTS.....................................................................................................................................82 13.1 Engineering Reports...............................................................................................................82 13.2 Information Reports to State Agencies.................. 13.2.1 Well Completion and Destruction Reports....................................................................82 13.2.2 Electronic Report to the California State Water Resources Control Board....................82 4+` 14.0 SITE CLOSURE...........................................................................................................................84 14.1 Estimated Cost.............. .. 84 ................ ........................................................................................ 15.0 PROJECT SCHEDULE................................................................................................................85 16.0 REFERENCES .............................................................................................................................86 TABLES Table 1: Depth to Groundwater Table 2: Results of Analyses of Samples of Groundwater Table 3: Thickness of Floating Product in Monitoring Well MW-7 Table 4: Wells in Neighborhood of 7500 West Eleventh Street Site FIGURES w Figure 1: Site Location Figure 2: Site Plan 1« Figure 3: Tank Pit and Pipe Trench Locations Figure 4: Plume of Affected Groundwater with Existing and Proposed Wells Figure 5: Affected Soil in Cross Section A-A' ,., Figure 6: Affected Soil in Cross Section B-B' Figure 7: Affected Soil in Cross Section C-C' Figure 8: Groundwater-quality Monitoring Well ... Figure 9: Locations of Floating Product Monitoring Wells Figure 10: Floating Product Monitoring Well Figure 11: Technology A-Floating Product Extraction Trench Location sic