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S E C O R <br /> Conceptual Site Model <br /> Chevron Service Station#9-6171 <br /> March 25, 2005 <br /> ITABLE OF CONTENTS <br /> 1.0 INTRODUCTION... ..... . ............ ..... .... ........... .. ... ...... .......... . ...... .... ...........1 <br /> 2.0 SETTING .. . . ................ ....... .................. . ......................... . . .. ......... ...... ............2 <br /> 21 Geology 2 <br /> 2 2 Stratigraphy 2 <br /> 2 3 Hydrogeology 3 <br /> 3.0 SITE BACKGROUND AND CURRENT SITE CONDITIONS .................... ....... ...............4 <br /> 3 1 Current Site Conditions 4 <br /> 3 2 Previous Investigations 4 <br /> 3 3 Well Search and Field Survey 9 <br /> 40 GROUNDWATER MONITORING AND SAMPLING........ ...... .... . .................... ...........10 <br /> 4 1 Chemical Concentrations versus Time 10 <br /> 4 2 Chemical Concentrations versus Distance 11 <br /> 5.0 REMEDIATION ................ ........... ................. ........... .. . ................ ... .. ..............12 <br /> 51 Hydrocarbon Remediation 12 <br /> 52 Chlorinated Compound Remediation 13 <br /> 5 2 1 Phase I — Groundwater Extraction System, 1998 to Present 13 <br /> 5 2 2 Phase II — Sod Vapor Extraction System, 1999 to Present 13 <br /> 5 2 3 Phase Ili — Groundwater Extraction System Expansion, 2002 to Present 14 <br /> 6.0 SOURCES OF IMPACTS ......... ... ................................ ... . ....... . ............ ....... .....1s <br /> 61 Chevron Service Station #9-6171 —6633 Pacific Avenue 16 <br />' <br /> 62 Shell Service Station —6131 Pacific Avenue 16 <br /> 6 2 1 Soil Sampling and Analyses 16 <br /> 6 2 2 Groundwater Sampling and Analyses 18 <br /> 63 Canepa's Carwash—6230 Pacific Avenue 19 <br /> 64 Former Regal Service Station #603—6425 Pacific Avenue 21 <br /> 6 4 1 Site History 21 <br /> 6 4 2 Sampling and Analyses 21 <br /> I 6 4 3 Remediation History 22 <br /> 65 Exxon Service Station #7-0136 —6425 Pacific Avenue 23 <br /> 66 Former Unocal Service Station #5421 — 7303 Pacific Avenue 23 <br />' 6 6 1 Sampling and Analyses 24 <br /> 67 Finest Care Cleaners—6503 Pacific Avenue 26 <br /> 6 7 1 Operational History and Regulatory Involvement 26 <br />' <br /> 672 Sampling and Analyses 27 <br /> 6 7 2 1 Groundwater Sampling and Analyses 27 <br /> 6 7 2 2 Soil Sampling and Analyses 27 <br />' <br /> 673 Remediation History 28 <br /> 6 8 Lincoln Village Cleaners Inc - 501 Lincoln Center 29 <br /> 6 9 Norge Cleaning Village - 505 Lincoln Center 29 <br /> 6 10 Jack Fuller Properties/Former Asian Market—911 Clarane Avenue 30 <br /> 70 POTENTIAL GROUNDWATER RECEPTORS ............ .. .... . . . .. .... .. . .. . . ....31 <br /> 8.0 GROUNDWATER FLOW AND TRANSPORT MODELING .. .... .. . .. .. ...... .....32 <br /> 9.0 CONCLUSIONS .. ... ........ .. .. ...... ... ... ............. ...... . . .. . ....... .... . .. . 33 <br /> N IF1les\Projects\Chevron\RetaiN#9-617115ite Conceptual Mode11FINAL_CSM doc Page i <br /> x <br />