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TABLE OF CONTENTS <br /> 1.0 EXECUTIVE SUMMARY .................................................................................. 1 <br /> 2.0 SITE DESCRIPTION AND BACKGROUND...................................................3 <br /> 2.1 Site Setting...................................................................................................... 3 <br /> 2.2 Topography and Surface Conditions.............................................................. 3 <br /> 3.0 HISTORICAL AND 2006 SITE ASSESSMENT ACTIVITIES...................... 5 <br /> 3.1 Summary of Environmental Investigations, Former Apache Plastics Facility5 <br /> 3.2 Summary of Environmental Investigations, Former Sunland Gasoline - <br /> Stockton City Cab Company Site................................................................................ 5 <br /> 3.3 2006 Site Characterization Activities, Former Apache Plastics Facility....... 6 <br /> 4.0 SUBSURFACE CONDITIONS......................................................................... 10 <br /> 4.1 Geologic Conditions..................................................................................... 10 <br /> 4.2 Hydrogeology................................................................................................ 10 <br /> 4.3 Extent of Petroleum Hydrocarbon Impact to Soil......................................... II <br /> 4.4 Extent of Petroleum Hydrocarhon Impact to Groundwater......................... 12 <br /> 5.0 REMEDIAL ACTIONS ..................................................................................... 15 <br /> 5.1 Soil Vapor Extraction................................................................................... 15 <br /> 5.2 Soil Excavation............................................................................................. 15 <br /> 6.0 POTENTIAL EXPOSURE PATHWAYS AND SENSITIVE RECEPTOR <br /> SURVEY.......................................................................................................................... 16 <br /> 6.1 Potential On-site Exposure Pathways.......................................................... 16 <br /> 6.2 Potential Off-site Receptors - Water Supply Wells....................................... 16 <br /> 6.3 Utilities.......................................................................................................... 17 <br /> 7.0 SUMMARY......................................................................................................... 18 <br /> 8.0 LIMITATIONS................................................................................................... 20 <br /> • <br /> K:1Apache Plastics\Reportslapache-scm-assessment report2006.doc Page iii srRa ru5 <br />