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A <br /> t•• Work Plan for Extended Site Chh a erization: 7500 West Eleventh Street, Tracy, CA. t Page i <br /> �. Table of Contents <br /> PROFESSIONAL CERTIFICATION AND LIMITATIONS..... "' <br /> .................................tar <br /> r. 1.0 INTRODUCTION........................................................................................................... 1 <br /> 1.1 Site Location................................................................................................................. 1 <br /> 1.2 Site Codes ..................................................................................................................... 1 <br /> 2.0 BACKGROUND............................................................................................................. 2 <br /> 3.0 GEOLOGY AND HYDROGEOLOGY.......................................................................... 3 <br /> 3.1 Water Supply Wells ...................................................................................................... 3 <br /> 4.0 REMOVAL OF UNDERGROUND TANKS <br /> 4.1 Removal of Tanks.........................................................................................................4 <br /> ... 4.2 Over-excavation of Dispenser Pit............................ ......4 <br /> ............................................... <br /> 4.3 Back-filling of Excavations........................................................................................... 5 <br /> 4.4 Disposition of Affected Soil Removed from Excavations............................................ 5 <br /> 5.0 DISTRIBUTION OF HYDROCARBONS IN THE SUBSURFACE............................. 5 <br /> 6.0 PROPOSED EXTENSION OF SITE CHARACTERIZATION..................................... 6 <br /> 6.1 Extended Topographical Survey................................................................................. 6 <br /> 6.2 Detection of Underground Utilities............................................................................. 6 <br /> �. 6.3 Locations of Additional Groundwater-quality Monitoring Wells.............................. 6 <br /> 6.3.1 Investigation of Vertical Extent: Affected Groundwater in Pump Island Area.... 7 <br /> 6.3.2 Definition of Eastern Limit: Principal Plume of Affected Groundwater.............. 7 <br /> +. 6.3.3 Definition of Down-gradient Extent: Principal Plume of Affected Groundwater 8 <br /> 6.3.4 Explore Subsurface and Groundwater at Apparent Source of Secondary Plume. 8 <br /> 6.3.5 Summary of Proposed Additional Groundwater-quality Monitoring Wells......... 9 <br /> �- 6.4 Well Drilling and Soil Sampling. ............................................................................... 9 <br /> 6.5 Field Modification: Drilling Locations, Sampling Intervals, Well Construction..... 11 <br /> 6.6 Disposal of Drill Cuttings......................................................................................... 11 <br /> '— 6.7 Well Development .......... ...................................................................................... 11 <br /> 6.8 Survey of Well-head Locations and Elevations........................................................ 11 <br /> 6.9 Determination of Groundwater Elevations............................................................... 12 <br /> -� 6.10 Well Purging............................................................................................................. 12 <br /> 6.11 Groundwater Sampling Procedure............................................................................ 12 <br /> 6.12 Groundwater Sample Analyses................................................................................. 13 <br /> w' <br /> 6.13 Disposal of Purge Water........................................................................................... 13 <br /> 7.0 PERMITTING............................................................................................................... 13 <br /> 8.0 PROJECT-SPECIFIC HEALTH AND SAFETY PLAN.............................................. 14 <br /> 9.0 REPORTS......................................:............................................................................... 14 <br /> 9.1 Engineering Report..................................................................................................... 14 <br /> sic <br />