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Phase I Environmental Site Assessment South Waterfront Greenway Site – Central Parcel SW Gibbs Street to SW Lane Street Portland, Oregon Prepared for Portland Development Commission December 20, 2007 15663-00 Phase I Environmental Site Assessment South Waterfront Greenway Site – Central District SW Gibbs Street to SW Lane Street Portland, Oregon Prepared for Portland Development Commission December 20, 2007 15663-00 Prepared by Hart Crowser, Inc. Richard D. Ernst, RG Principal Five Centerpointe Drive, Suite 240 Lake Oswego, Oregon 97035-8652 Fax 503.620.6918 Tel 503.620.7284 CONTENTS Page 1.0 SUMMARY OF FINDINGS 1 1.1 Recognized Environmental Concern 1 1.2 Historical RECs 2 1.3 De Minimis Conditions 5 2.0 INTRODUCTION 6 2.1 Purpose and Scope 7 2.2 Assumptions, Limitations, and Exceptions 7 2.3 Special Terms and Conditions 8 3.0 SITE DESCRIPTION 8 3.1 Location and Vicinity General Characteristics 8 3.2 Current Use and Description of Property 8 3.3 Adjoining Property Use and Description 9 4.0 USER PROVIDER INFORMATION 10 4.1 Recorded Instruments on Property 10 4.2 Specialized Knowledge and Property Information 10 4.3 Other User Provided Documents 10 5.0 RECORDS REVIEW 10 5.1 Environmental Records 11 5.2 Physical Setting Sources 15 5.3 Historical Information 16 5.4 Previous Report 23 6.0 SITE RECONNAISSANCE 29 6.1 Subject Property 29 6.2 Adjoining and Surrounding Properties 31 Hart Crowser Page i 15663-00 December 20, 2007 CONTENTS (CONTINUED) 7.0 INTERVIEWS 32 8.0 GEOPHYSICAL SURVEY 32 9.0 DATA GAP SUMMARY 33 10.0 CONCLUSIONS 33 11.0 ENVIRONMENTAL PROFESSIONAL STATEMENT 34 12.0 REFERENCES 34 12.1 Provided and Cited within this Report 34 12.2 Unavailable Reports 36 FIGURES 1 Site Location Map 2 Site Plan APPENDIX A SITE RECONNAISSANCE PHOTOGRAPHS APPENDIX B SUPPORTING DOCUMENTATION APPENDIX C EDR REPORT APPENDIX D GEOPHYSICAL SURVEY REPORT Hart Crowser Page ii 15663-00 December 20, 2007 PHASE I ENVIRONMENTAL SITE ASSESSMENT SOUTH WATERFRONT GREENWAY SITE – CENTRAL DISTRICT SW GIBBS STREET TO SW LANE STREET PORTLAND, OREGON 1.0 SUMMARY OF FINDINGS This report presents the results of our Phase I Environmental Site Assessment (ESA) of a 100- to 150-foot wide Greenway along the west bank of the Willamette River between SW Gibbs and SW Lane Streets in the Central District of the North Macadam Urban Renewal Area (Figures 1 and 2). The Greenway site consists of two tax lots, which are owned by River Campus Investors, LLC (RCI) and North Macadam Investors, LLC (NMI) and were once part of larger parcels. A summary of our findings of the Phase I ESA follows. Based on a review of available information, we identified potential environmental concerns as a recognized environmental condition (REC), a historical REC, or a de minimis condition. A recommendation for additional assessment, if warranted, is also presented for each concern. Please refer to the remainder of text for additional discussions of these findings. 1.1 Recognized Environmental Concern RECs are defined in ASTM E 1527-05 as the presence or likely presence of any hazardous substances or petroleum products on a property under conditions that indicate an existing release, a past release, or a material threat of a release of any hazardous substances or petroleum products into structures on the property or into the ground, groundwater, or surface water of the property. 1.1.1 Potential for Localized Areas of Contaminated Soil From our research, we identified the potential for localized areas of contaminated soil as a REC. The subject property has been filled, mostly in the 1920s prior to development; however, a shipway was located within the central portion of the Greenway, and was filled in the mid 1960s. Several localized areas of soil contamination have been encountered which were subsequently remediated (see Section 1.2.2). As part of this Phase I ESA, a geophysical survey was performed over the subject property. Seventeen magnetic anomalies were identified consisting of likely buried demolition debris and/or buried metal. Based on previous areas of soil contamination, historical filling, and geophysical anomalies, the potential for additional localized areas of contaminated soils exists. Recommendations. We recommend a focused Phase II investigation of geophysical anomalies indicating buried debris as well as former areas of soil contamination that Hart Crowser Page 1 15663-00 December 20, 2007 may be excavated in the near future as part of the greenway development. If the Phase II investigation reveals contaminated soils, a soil management plan (SMP) should be prepared and implemented to assist the earthwork contractor and/or environmental consultant in identification and management of contaminated soil. 1.1.2 Contamination from Historical Activities Industrial activities have occurred on and adjacent to the subject property from the 1930s through the 1990s. The northern portion of the property was a shipbuilding facility during World War II. A shipway was constructed within the central portion of the property for this facility; it was later filled in the mid 1960s. From the late 1940s to the early 2000s, the northern portion of the property was occupied or used by commercial/ industrial facilities, including steel and metal fabricating, road construction, general construction and electrical products manufacturing. The southern portion of the property was primarily used from the 1930s through 1980s for gravel crushing and concrete production plants. Previous environmental assessments were conducted in the 1990s and 2000s on the subject property, which encountered localized areas of soil contamination (Section 1.2.2) and also low levels of contamination. For this Phase I ESA, we attempted to obtain the actual chemical data, but mainly acquired only project summaries. In 2002, the subject property was sloped back; excavated soils were screened and placed again on the property as a 1 to 2 feet layer of topsoil. Recommendations. Several potential environmental concerns may be associated with historical activities: contamination from the activities themselves (e.g., the shipbuilding facility; fill material placed on the property (i.e., shipway); and excavation of these soils, with subsequent screening and spreading back over the property. We recommend a focused Phase II investigation of soils potentially affected by historical activities including soils that may be excavated or exposed in the near future as part of the greenway development. If the Phase II investigation reveals contaminated soils, a SMP should be prepared as described above. We also recommend that documents that were unavailable for our review (Section 12.2) be obtained and reviewed for information and chemical data pertinent to the subject property. 1.2 Historical RECs Historical RECs are defined in ASTM E 1527-05 as environmental conditions, which in the past would have been considered a REC, but which may not be currently considered a REC. If a past release of any hazardous substances or petroleum products has occurred in connection with the property and has been remediated, with such remediation accepted by the responsible regulatory agency (i.e., a “No Further Action” [NFA] letter), this condition should be considered a historical REC. Hart Crowser Page 2 15663-00 December 20, 2007 1.2.1 Former Underground Storage Tank Excavation In 1995, two underground storage tanks (USTs) were removed from the NMI property. Approximately 840 tons of diesel-contaminated soil was excavated from the UST nest. This excavation extended into the subject property. Confirmation samples from the final excavation limits indicated diesel concentrations less than DEQ Level II Soil Matrix cleanup standards (500 mg/kg). (The maximum diesel detection was 180 mg/kg in a sample at 13.5 feet bgs at the east end of the excavation.) The DEQ issued a “No Further Action” (NFA letter) on September 4, 1996. Recommendation. None. If deeper excavations (greater than 10 feet deep) are conducted in this area during greenway development, an environmental consultant should evaluate any potential unforeseen diesel-contaminated soil; any contaminated soil encountered should be properly managed in accordance with a SMP. 1.2.2 Remediation of Localized Areas of Soil Contamination Several localized areas of soil contamination have been previously encountered within the Greenway during prior environmental investigations and during grading of the greenway property as part of the development of South Waterfront. All these areas were remediated by soil excavation and off-site disposal. These areas are as follows (from north to south as shown on Figure 2). TP-33 Excavation. Approximately 18 tons of lead-contaminated soil were excavated from 6 to 9 feet below the ground surface (bgs) from the northern portion of the Greenway. The residual lead concentration in the excavation bottom sample was 70.6 mg/kg. Subsurface Vault. A vault with liquid and sludge was discovered in the northern portion of the Greenway in the late 1990s. After removal of its contents and the vault itself, approximately 88 cubic yards (cy) of petroleum contaminated soil were removed. Petroleum constituents were not detected in confirmation soils samples or in groundwater from a well installed downgradient of the vault. Southeast Corner Excavation. Approximately 950 tons of diesel-contaminated soil was removed from between 4 and 7 feet bgs within the central portion of the Greenway. Diesel was not detected in confirmation samples. TP-29 Excavation. Polynuclear aromatic hydrocarbons (PAHs) were detected in soil next to a timber pile in test pit TP-29 in the southern portion of the Greenway. Approximately 100 tons of soil was removed between 13 and 20 feet bgs. Two PAHs were detected in a confirmation sample from excavation bottom; however, they were below risk-based concentrations (RBCs) for residential soil. Hart Crowser Page 3 15663-00 December 20, 2007 Concrete Support Excavation. In 1995, approximately 240 tons of petroleum- contaminated soil was excavated from beneath a concrete support of the former structure in the southern portion of the Greenway.

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