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Phase I Environmental Site Assessment Old Snelling Avenue & County Road E Improvements WSB Project No. 015447-000 Page 10 5.2 Regulatory File Review ASTM Standard E1527-13 requires that a regulatory file review be conducted if the Project Corridor or adjacent sites are listed in a leak or spills database or other known databases indicating contamination. Based on information included in the ERIS Database Report (see Section 5.1 and the MPCA’s What’s in my Neighborhood (WIMN) database, three (3) regulatory file reviews were ordered for this assessment. The file reviews were associated with two adjacent sites and one site located within 250 feet of the Project Corridor. Copies of the files are available from WSB by request. The following file review information is provided: Project Corridor File Reviews No Project Corridor file reviews were required for this assessment. Adjacent Site File Reviews Site Assessment SA0008404 – Polansky Trucking, 3434 Snelling Ave N Site Assessment SA0008406 – Midwest Brass & Aluminum Foundry Waste, No address No files were located by the MPCA for Site Assessment sites SA0008404 and SA0008406. Per the MPCA WIMN database, the SA0008404 listing was opened by the MPCA on January 1, 1987 and closed on August 19, 1998. The SA008406 listing was opened by the MPCA on January 1, 1987 and closed on August 17, 1998. Based on the closed/inactive status, type of listing, and lack of follow-up cleanup actions, the adjacent site assessment listings do not represent RECs in connection to the Project Corridor. Site Assessment sites are places where contamination or regulated waste activities have been reported to the MPCA. These sites are assessed to determine if there is a potential for human health or the environment to be exposed to hazardous substances. If it is determined that there is a potential for exposure, the site is referred to a cleanup program (e.g. Superfund or Petroleum). If it is determined that little or no exposure potential exists and no further remedial actions are planned, the site is closed and listed as inactive. Surrounding Area File Reviews Leak Site LS0012785 – Floren Residence, 1434 Arden Place Based on proximity (approximately 250 feet east) and upgradient location relative to the Project Corridor, a regulatory file review was ordered for MPCA Leak site LS0012785. The leak was discovered on July 16, 1999 when a well contractor was abandoning a site well and discovered fuel oil floating on the water table in the casing of the well. The fuel oil had seeped through a crack in the well casing. The source of the release was a 1,000-gallon fuel oil tank. An Excavation Report Worksheet was completed following the fuel oil tank removal on July 19, 1999. Approximately three cubic yards of contaminated soil was removed offsite. The depth to static groundwater was measured at 84 feet below grade during abandonment of the site well. Shallow groundwater was not encountered during the tank removal. A Limited Site Investigation (LSI) was completed at the site on September 10, 1999. Seven (7) total borings were advanced at the site in August 1999. Groundwater was not encountered during the investigation. DRO concentrations were detected between 50 and 1,600 mg/kg within the former tank basin at depths ranging between 21 and 28 feet below grade. The vertical extent of contamination did not exceed a depth of 30 feet below grade. The horizontal extent of contamination was contained in an area localized around the former tank basin below the site basement. No soil contamination was observed beyond the tank basin. According to the LSI, approximately 54 feet separated the impacted soil from the groundwater table at the site. Due to clayey soils encountered during the investigation, the fuel oil contamination was expected to resist vertical and horizontal movement. The site was issued closure on September 23, 1999.