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Beacon Station No. 3641 December 7,2005 Stockton,California Results of Additional Subsurface Investigation and Site Conceptual Model CONTENTS INTRODUCTION ...............................................................................................................1 SITE DESCRIPTION AND BACKGROUND ................................................................1 ADDITIONAL SUBSURFACE INVESTIGATION ..........................................................4 SITE CONCEPTUAL MODEL ........................................................................................5 Site Physical and Hydrogeological Conditions........................................................6 Source,Nature and Extent of Soil and Groundwater Impacts.................................7 Fate and Transport of Petroleum Hydrocarbons in Soil and Groundwater............I I Transport Mechanisms and Exposure Pathways to Potential Receptors ...............12 Sensitive Receptor Well Search.............................................................................14 Ongoing Remedial Action.....................................................................................15 CONCLUSION AND RECOMMENDATIONS................................................................1_5 DISTRIBUTION................................................................................................................17 LIMITATIONS..................................................................................................................17 FIGURES, TABLES AND GRAPHS FIGURE 1: SITE VICINITY MAP FIGURE 2: SITE PLAN FIGURE 3: SITE PLAN WITH CROSS SECTION TRACES FIGURE 4: GENERALIZED GEOLOGIC CROSS SECTION A-A' FIGURE 5: GENERALIZED GEOLOGIC CROSS SECTION B-B' FIGURE 6: SITE PLAN/GROUNDWATER CONTOUR MAP FIGURE 7: APPROXIMATE DISTRIBUTION OF HYDROCARBONS IN SOIL FIGURE 8: TPHg IN GROUNDWATER ISOCONCENTRATION MAP FIGURE 9: BENZENE IN GROUNDWATER ISOCONCENTRATION MAP FIGURE 10: MTBE IN GROUNDWATER ISOCONCENTRATION MAP FIGURE 11: GENERALIZED GEOLOGIC CROSS SECTION A-A' WITH TPHg CONCENTRATIONS IN GROUNDWATER FIGURE 12: GENERALIZED GEOLOGIC CROSS SECTION B-B' WITH TPHg CONCENTRATIONS IN GROUNDWATER FIGURE 13: GENERALIZED GEOLOGIC CROSS SECTION A-A' WITH BENZENE CONCENTRATIONS IN GROUNDWATER FIGURE 14: GENERALIZED GEOLOGIC CROSS SECTION B-B' WITH BENZENE CONCENTRATIONS IN GROUNDWATER FIGURE 15: GENERALIZED GEOLOGIC CROSS SECTION A-A' WITH MTBE CONCENTRATIONS IN GROUNDWATER FIGURE 16: GENERALIZED GEOLOGIC CROSS SECTION B-B' WITH MTBE CONCENTRATIONS IN GROUNDWATER TABLE 1: GROUNDWATER MONITORING DATA TABLE 2: SOIL ANALYTICAL RESULTS TABLE 3: GROUNDWATER ANALYTICAL RESULTS TABLE 4: VAPOR EXTRACTION SYSTEM PERFORMANCE DATA GRAPHS I through 21 641rpt l 1-05 Project No. 1641,18 HORIZON ENVIRONMENTAL INC.