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1-5:Aurora Donald Interchange(Exit 278) Interchange Area Management Plan for Marion County Approval ODOT KN19062 Oregon Department of Transportation—Region 2 monitoring, and on-site soil treatment/disposal.The site received a No Further Action (NFA) letter from DEQ in 2014. However, based on the extensive history of environmental issues at the property, proximity to the project corridor, and known residual contamination,the presence of the former Leathers Oil site is considered a potential REC to the project corridor. In addition to the above facilities,one spill site was identified as a REC and is listed in the DEQ ECSI database. This is the Younger 1-5 @ Donald near MP 278 site. In September 1997, approximately 1,700 gallons of diesel and 4,000 gallons of gasoline were released as a result of an accident and fire on a cargo truck and trailer on 1-5 near Exit 278. Investigation and monitoring was conducted under oversight from DEQ in the late 1990s. The site subsequently received an NFA determination from DEQ in 2001. However, based on the spill volume and extent,there is some potential for residual soil contamination in the vicinity of the road shoulder or other areas. While the potential impact is likely low,the past release incident represents a potential REC to the project corridor. A site reconnaissance was conducted in January 2019. No significant RECs, other than those identified above, were documented during the site reconnaissance. A road shoulder soil sampling memorandum was prepared presenting the results of road shoulder soil sampling conducted in November 2019. It was subsequently approved by ODOT(see Appendix I). No samples exceeded the 100 mg/kg threshold for lead. One or more polycyclic aromatic hydrocarbons (PAH) constituents were detected above the method detection limit in 18 of 54 samples collected. 2.5.1 Recommendations The following recommendations are based on the conclusions of the hazardous materials corridor study: The completion of a Level 2 Preliminary Site Investigation (PSI) should be considered for the project corridor. Specifically,the presence of known and potential environmental issues identified at the Travel Center of America and Flying J properties have some potential to have impacted subsurface conditions in the corridor and future construction and/or acquisition areas.The Level 2 PSI should include characterization of soil and/or groundwater in areas potentially impacted by construction, particularly along the south and east boundaries of the Travel Center of America and along the north and east boundaries of Flying J property. July 2020 1274-3012-031 2-15