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i.. Page i <br /> Extended Plume Def nrtian -7500 W 11th St., Tracy,GA. <br /> Table of Contents <br /> PROFESSIONAL CERTIFICATION AND LIMITATIONS.............. <br /> 1.0 INTRODUCTION ...............................................................................................l <br /> 1.1 Site Location...............................................................................................................................1 <br /> 1.2 Site Codes...................................................................................................................................1 <br /> 2.0 BACKGROUND.............................................................................................................................2 <br /> 2.1 Ownership History of Site and Fueling Station..........................................................................2 <br /> 2.2 Removal of Underground Fuel Storage Tanks...........................................................................2 <br /> 2.3 Site Geology and Hydrogeology................................................................................................3 <br /> 3.0 PHASED SITE CHARACTERIZATION AND GROUNDWATER MONITORING...................5 <br /> .... <br /> 3.1 Initial Site Characterization........................................................................................................5 <br /> 3.2 Initial Quarterly Groundwater-quality Monitoring Program......................................................7 <br /> 3.3 Extended Site Characterization ......................................................................---......................... <br /> 3.4 Extended Quarterly Groundwater-quality Monitoring Program................................................8 <br /> 3.5 Annual, Semi-annual and Quarterly Groundwater-quality Monitoring Program.......................8 <br /> 4.0 ADDITIONAL MONITORING WELLS TO REFINE PLUME DEFINITION............................9 <br /> 4.1 Well Locations...................................... ................................... .........9 <br /> 4.2 Permitting...................................................................................................................................9 <br /> 4.3 Detection of Underground Utilities ..................9 <br /> 4.4 Well Installation and Soil Sampling <br /> 4.5 Analyses of Soil Samples.........................................................................................................10 <br /> 4.6 Disposal of Drill Cuttings.........................................................................................................11 <br /> 4.7 Survey of Well-head Locations and Elevations........................................................................11 <br /> 4.8 Refined Interpretation of Hydrostratigraphy............................................................................11 <br /> 4.8.1 Hydraulic Conductivity of Strata .....................................................................................14 <br /> 4.9 Well Development....................................................................................................................14 <br /> 4.10 Groundwater-quality Monitoring <br /> 4.10.1 Determination of Groundwater Elevations.....................................................................15 <br /> 4.10.2 Well Purging...................................................................................................................15 <br /> 4.10.3 Groundwater Sampling Procedure .................................................................................15 <br /> 4.10.4 Groundwater Sample Analyses......................................................................................16 <br /> 5.0 MONITORING AND MANAGEMENT OF FLOATING PRODUCT........................................17 <br /> 5.1 Removal of Floating Product Beneath 7500 West Eleventh Street Property...........................17 <br /> 5.2 Interim Measures for Removal of LNAPL from Area around MW-7......................................17 <br /> x„ 5.3 Extended Investigation of LNAPL in Subsurface....................................................................19 <br /> 5.3.1 Measurement of Thickness of Floating Product...............................................................20 <br /> 6.0 WATER QUALITY IN POTABLE WATER SUPPLY WELLS.................................................21 <br /> 6.1 Monitoring of Potable Water Quality.......................................................................................21 <br /> 6.1.1 Well Head Inspection,Repair and Installation of Sampling Ports...................................21 <br /> 6.I.2 Recovery and Analysis of Samples from Potable Water Supply Wells...........................22 <br /> 6.2 Results of Potable Water Sampling <br /> 6.3 Notification to Well Owners........................................ <br /> sic <br />