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Broadway Recovery Center 707 W Burnside Street Portland, Oregon 97209 ECSI No: 5413

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Broadway Recovery Center 707 W Burnside Street Portland, Oregon 97209 ECSI No: 5413 Independent Cleanup Pathway Report Broadway Recovery Center 707 W Burnside Street Portland, Oregon 97209 ECSI No: 5413 Prepared by Oregon & Washington April 5, 2011 EXECUTIVE SUMMARY Investigation of the site disclosed a leaking underground storage tank (LUST) and an area of contaminated fill with concentrations of lead and PAHs in soil and tetrachloroethene in soil gas above the Oregon Department of Environmental Quality (DEQ) Risk-Based Concentrations for urban residential exposure. The leaking UST (LUST) and contaminated fill were successfully removed from the site during redevelopment activities in October and November 2010. We recommend DEQ issue a No Further Action status for ECSI 5413. Geotechnical Resources, Inc. (GRI) 9725 SW Beaverton-Hillsdale Hwy, Suite 140 Beaverton, OR 97005 503-641-3478 i TABLE OF CONTENTS Page 1.0 INTRODUCTION ............................................................................................................................ 1 1.1 Project Introduction ...................................................................................................................... 1 1.2 Purpose and Objectives ................................................................................................................ 1 2.0 SITE BACKGROUND ....................................................................................................................... 1 2.1 Site Location ................................................................................................................................. 1 2.2 Site Description ............................................................................................................................ 1 2.3 Site History and Facility Operations .............................................................................................. 1 2.3.1 Ownership History ................................................................................................................ 2 2.3.2 Operating History .................................................................................................................. 2 2.4 Regulatory History ........................................................................................................................ 3 2.5 Previous Investigation ................................................................................................................... 3 3.0 ENVIRONMENTAL SETTING ........................................................................................................... 3 3.1 Climate Information ...................................................................................................................... 3 3.2 Topography .................................................................................................................................. 4 3.3 Surface Water Hydrology .............................................................................................................. 4 3.4 Regional and Site Geology and Soils ............................................................................................. 4 3.5 Hydrogeology ............................................................................................................................... 4 4.0 SITE INVESTIGATION...................................................................................................................... 4 4.1 Site Characterization Plan ............................................................................................................. 4 4.2 Sampling Methods ........................................................................................................................ 5 4.3 Sampling Results ........................................................................................................................... 5 4.4 Data Validation ............................................................................................................................. 6 5.0 SOURCES, NATURE AND EXTENT OF CONTAMINATION ........................................................... 7 5.1 Define the Sources of Contamination............................................................................................ 7 5.2 Nature of Contamination .............................................................................................................. 7 5.3 Extent of Contamination................................................................................................................ 8 5.3.1 Soil ........................................................................................................................................ 8 5.3.2 Groundwater ......................................................................................................................... 9 5.3.3 Other Media .......................................................................................................................... 9 6.0 EXPOSURE PATHWAY SUMMARY ............................................................................................... 10 6.1 Groundwater Pathways of Exposure ........................................................................................... 10 6.2 Direct Contact (Soil, Structures) Pathways of Exposure ................................................................ 10 6.3 Surface Water and Sediment Pathways of Exposure .................................................................... 10 6.4 Air Pathways of Exposure ............................................................................................................ 10 7.0 CONTAMINANT FATE AND TRANSPORT ................................................................................... 10 7.1 Contaminant Transport ............................................................................................................... 10 7.2 Contaminant Degradation/Persistence ........................................................................................ 11 7.3 Conceptual Site Model ............................................................................................................... 12 7.4 Locality of the Facility ................................................................................................................. 12 ii 8.0 LAND AND WATER USE DETERMINATIONS............................................................................... 12 8.1 Current and Future Land Use ...................................................................................................... 12 8.2 Beneficial Uses of Water ............................................................................................................. 13 9.0 RISK ASSESSMENT ......................................................................................................................... 13 9.1 Human Health Risk Assessment .................................................................................................. 13 9.2 Baseline Ecological Risk Assessment ........................................................................................... 13 10.0 CLEANUP STANDARDS AND HOT SPOTS ................................................................................ 13 10.1 Selection of Cleanup Standards ................................................................................................. 13 10.2 Final Hot Spot Determination ................................................................................................... 13 11.0 REMOVAL OR REMEDIAL ACTION REPORT ............................................................................. 14 11.1 Work Completed ...................................................................................................................... 14 11.2 Verification Sampling ................................................................................................................ 15 11.3 Engineering Controls ................................................................................................................. 15 12.0 RESIDUAL RISK ............................................................................................................................ 15 12.1 Residual Risk Assessment .......................................................................................................... 15 12.2 Protection of Human Health and the Environment ................................................................... 16 13.0 REFERENCES ................................................................................................................................. 16 14.0 LIMITATIONS AND SIGNATURES .............................................................................................. 16 List of Figures 1 Vicinity Map 2 Site Map with 1950 Fueling Station 3 Sample Location Map 4 Geologic Cross Section 5 Groundwater Elevation Contour Map 6 Contaminated Fill Analytical Results 7 VOCs in Groundwater 8 VOCs in Soil Gas 9 Areas of Concern 10 Gasoline In Soil 11 Conceptual Site Model – Exposure 12 Conceptual Site Model – RBC 13 Soil Removal at Site 14 Confirmation Soil Samples List of Tables 1 Soil Analytical Data – Contaminated Fill 2 Soil Analytical Data – Building Footprint 3 Soil Analytical Data - Sidewalk 4 Groundwater Analytical Data 5 Soil Gas Analytical Data 6 Duplicate Analysis 7 Cleanup Standards iii List of Appendices A. Work Plan B. Field Investigation Procedures C. Underground Tank Decommission Report (Soil Solutions, Inc.) D. Laboratory Data Reports E. Well Survey/Beneficial Use Determination Documentation F. Site-Specific
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