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• 0 Former Countryside Market, Stockton,California Feasibility Study and Interim Remedial Action Plan May 20,2013 TABLE OF CONTENTS PAGE LISTOF FIGURES........................................................................................................................................ iii LISTOF TABLES......................................................................................................................................... 1.0 INTRODUCTION ............................................................................................................................1-1 1.1 Report Organization ...........................................................................................................1-1 2.0 SITE BACKGROUND AND PHYSICAL SETTING......................................................................2-1 2.1 Site Location and Description...........................................................................................2-1 2.2 Site Geology/Hydrogeology..............................................................................................2-1 2.3 Previous Site Investigations..............................................................................................2-1 3.0 PRELIMINARY CONCEPTUAL SITE MODEL............................................................................3-1 3.1 Sources and Transport Mechanisms.................................................................................3-1 3.1.1 Surface and Subsurface Soil .......................................................................................3-1 3.1.2 Ambient Air...................................................................................................................3-2 3.1.3 Indoor Air......................................................................................................................3-2 3.1.4 Groundwater.................................................................................................................3-3 3.2 Summary of Potential Exposure Pathways.......................................................................3-3 4.0 EVALUATION OF INTERIM REMEDIAL TECHNOLOGIES.......................................................4-1 4.1 Screening of Remedial Technologies..............................................................................4-1 4.2 Detailed Analysis of Remedial Alternatives.....................................................................4-2 4.2.1 Interim Remedial Technology Selection......................................................................4-4 5.0 PROPOSED FEASIBILITY TESTING AND DATA COLLECTION PLAN..................................5-1 5.1 Sparge Testing ...................................................................................................................5-1 5.1.1 Pre-Field Activities........................................................................................................5-2 5.1.2 Drilling and Well Installation Details.............................................................................5-2 5.1.3 Well Construction Details.............................................................................................5-3 5.1.4 Sparge Test Methods...................................................................................................5-4 5.1.5 Sparge Test and Monitoring Equipment................................................................5-5 5.1.6 Breakthrough and Step Testing...................................................................................5-5 5.1.7 Helium Tracer Study....................................................................................................5-6 5.1.8 Radius of Influence.......................................................................................................5-6 5.1.9 Monitoring and Sampling Methods..............................................................................5-6 5.2 Background Bioremediation and Geochemical Indicator Data Collection Plan ...............5-7 5.3 Potential Vapor Extraction Testing.....................................................................................5-8 6.0 VERTICAL PLUME DELINEATION ASSESSMENT...................................................................6-1 6.1 Domestic Well Video Logging............................................................................................6-1 6.2 Cone Penetration Testing ..................................................................................................6-1 6.2.1 Pre-Field Activities and Boring Advancement Details.................................................6-2 6.2.2 Depth-Discreet Groundwater Sampling.......................................................................6-2 Feasibility Sally&.RAP Tei Final dw i The Source Group,Inc.