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S E C ® R <br /> • Conceptual Site Model R, <br /> March 24, 2004 <br /> rt <br /> Page I <br /> k4� <br /> TABLE OF CONTENTS "r <br /> 1 , <br /> 1 0 INTRODUCTION 3 <br /> 1 1 OBJECTIVES 1 ` <br /> 4� <br /> 2 0 SITE DESCRIPTION AND FEATURES 1 <br /> 21 Geology 1 <br /> 2 2 Hydrogeology 2 sg <br /> 2 2 1 Groundwater Flow Rates and Directions 2 ' <br /> 222 Groundwater Use 2 <br /> 2 3 Surface Water 2 <br /> 2 4 Local Land Use 3 <br /> 241 Aerial Photograph Review 3 <br /> 242 Topographic Map Review 3 y <br /> 3 0 PREVIOUS INVESTIGATIONS . 4 <br /> 31 Groundwater Technology Monitoring Well and Soil Boring Installation, March 1995 4 <br /> 32 Touchstone Developments Environmental Management Report, UST Closure <br /> Report and Limited Over-excavation Sampling Report, Dated August 7, 1997 4 <br /> 33 SECOR International Incorporated, Assessment Report, Dated January 18, 2001 5 <br /> 34 SECOR International Incorporated, Assessment Report and Work Plan for Further ' <br /> Assessment, Dated March 5, 2002 5 <br /> 40 SOIL DATA SUMMARY 5 <br /> 41 1 March 1995, Monitoring Well Installation 5 <br /> 4 1 2 September 1996, USTs, Hydraulic Hoists, Product Dispensers, and Product Lines <br /> 6 k-0 <br /> Removal1 <br /> 4 1 3 August 2000, Site Assessment 7 <br /> 4 1 4 Petroleum Hydrocarbons Adsorbed in Soil 7 <br /> 5 0 GROUNDWATER MONITORING AND SAMPLING 8 <br /> 5 1 Groundwater Chemical Concentration Trends 8 ti <br /> 5 1 1 Onsite Groundwater Analytical Data 9 <br /> 5 1 2 Offsite Groundwater Analytical Data 9 <br /> 5 1 3 Estimated Mass of Petroleum Hydrocarbons Remaining in Groundwater 9 <br /> 5 2 Chemical Concentrations versus Time 10 <br /> 5 3 Groundwater Elevations versus Time 10 <br /> I <br /> 6 0 SOURCES OF IMPACTS 10 <br /> 6 1 Chevron Service Station 9-2033 11 <br /> 6 2 Former Texaco Service Station 11 f <br /> 6 2 1 Site Description 11 <br /> 11 <br /> 622 Remedial Activities <br /> 623 Historical Report Summary 11 <br /> 6 3 Former Arco Service Station 2168 12 <br /> . 6 3 1 Site Description 12 <br /> 632 Remedial Activities 12 <br /> 6 3 3 Historical Report Summary 13 <br /> 1 1Clievron192033\RFPORTSICSMICSM 92033 (REV B) doc <br />