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Site Characterization Repori: 7500 West Eleventh Street, Tracy, CA. Page i <br /> f <br /> Table of Contents <br /> PROFESSIONAL CERTIFICATION AND LIMITATIONS.... ......... <br /> ....................iii <br /> 1.0 INTRODUCTION.......................:.............................................................................. 1 <br /> 1.1 Site Location............................................................................................................,l <br /> :t 1.2 Site Code.................................................................................................................. 1 <br /> 1.3 Background.............................................................................................................. 1 <br /> 1.4 Geology and Hydrogeology..................................................................................... 2 <br /> 2.0 REMOVAL OF UNDERGROUND TANKS ............................................................ 3 <br /> 2.1 Removal of Registered Tanks.................................................................................. 3 <br /> 2.2 Removal of Piping and Pump Islands............... ......... 3 <br /> .............................................. <br /> 2.3 Removal of Unregistered Tanks ..............................................................................4 <br /> 2.4 Soil Sampling in Tank Pits and Pipeline Trenches.................................................. 4 <br /> 2.5 Over-excavation of Dispenser Pit <br /> 2.6 Back-filling of Excavations..................................................................................... 5 <br /> 2.7 Disposition of Stockpiled Soil................................................................................. 5 <br /> 3.0 SITE CHARACTERIZATION PROGRAM.............................................................. 6 <br /> ;t 3.1 Search for Existing Drinking-water and Agricultural Wells <br /> 3.2 Site Survey............................................................................................................... 7 <br /> _ 3.3 Permitting. ............................................................................................................... 8 <br /> 3.4 Subsurface Exploration Using Push-probe Borings <br /> 9 <br /> 3.4.1 Recovery of Soil Samples from Push-probe Borings <br /> 3.4.2 Recovery of Groundwater Samples from Push-probe Borings....................... 10 <br /> 3.4.3 Selection of Locations for Push-probe Borings.............................................. I1 <br /> 1 " 3.5 Grouting of Push-probe Borings................................................... <br /> ._ 3.6 Installation of Groundwater-quality Monitoring Wells......................................... 13 <br /> 3.6.1 Selection of Location for Groundwater-quality Monitoring Wells ................ 13 <br /> 4 tY g <br /> 3.6.2 Soil Sampling in Monitoring Well Borings.................................................... 14 <br /> 3.6.3 Well Development.......................................................................................... 15 <br /> : J 3.6.4 Well Completion Reports ............................................................................... 15 <br /> 3.7 Groundwater Sampling in Monitoring Wells ........................................................ 15 <br /> t. 3.7.1 Determination of Groundwater Elevations..................................................... 16 <br /> 3.7.2 Groundwater Sampling Procedure................ .... 16 <br /> 3.7.3 Laboratory Analyses....................................................................................... 16 <br /> 3.8 Disposal of Drill Cuttings and Well Development and Purge Water.................... 17 <br /> 3.8.1 Disposal of Drill Cuttings <br /> 3.8.2 Disposal of Well Development and Purge Water.:......................................... 17 <br /> ' 4.0 HYDROGEOLOGIC REGIME................................ <br /> ..... ................................................ 18 <br /> 4.1 Groundwater Gradient and Flow Direction........................................................... 18 <br /> 4.2 Hydrostratigraphy.................................................................................................. 19 <br /> 1 <br /> '' sic <br />