07-20-2020-WS - Laserfiche WebLink

Home Browse Search

Phase I Environmental Site Assessment Old Snelling Avenue & County Road E Improvements WSB Project No. 015447-000 Page 4 uncertainty regarding the potential for RECs at the Project Corridor. This assessment is intended to reduce, but not eliminate, uncertainty related to the potential for RECs in connection with the Project Corridor within reasonable time limits and cost. The conclusions and recommendations contained in this report represent WSB’s professional opinions. These opinions are arrived at in accordance with currently acceptable Phase I ESA practices at this time and are subject to the inherent limitations of environmental assessments outlined in this section. WSB obtained, reviewed, and evaluated information provided by Project Corridor owners/representatives, Environmental Risk Information Services Ltd. (ERIS) historical site reports and other local/state public entities. WSB’s conclusions, opinions, and recommendations are based in part on this information. WSB’s services did not include the verification of the accuracy or authenticity of this information as this is beyond the scope of a Phase I ESA per ASTM guidelines. This report is based upon the standard gathered information (ASTM E1527-13) and WSB’s observations made during the site reconnaissance. Given the inherent limitations of environmental assessment work, WSB does not guarantee that the Project Corridor is free of hazardous or potentially hazardous materials or conditions, or that latent or undiscovered conditions will not become evident in the future. WSB’s report is prepared in accordance with WSB’s Scope of Work and no other warranties, representations, or certifications are made. 2.5 Previous Environmental Documents The following previous environmental documents were provided to WSB and reviewed as part of this assessment: · Contaminated Soil Encountered During Old Snelling Avenue Bridge 62J17 Replacement, email correspondence and laboratory analytical reports dated between November- December 2018, by multiple consultants (2018 Bridge 62J17 Replacement); · Geotechnical Boring Logs, Old Snelling Avenue Roadway Improvements, dated October 3-4, 2019, by Northern Technologies, LLC (NTI) (2019 Geotechnical Borings); and · Memorandum, Information Pertaining to Spills, Tanks, Response Calls, or Other Environmental Concerns, Snelling Avenue North, Arden Hills, dated February 10, 2020, by the City of Arden Hills (2020 Memo); Copies of the previous environmental documents are available from WSB by request. The following is a summary of the previous environmental reports: 2018 Bridge 62J17 Replacement Bridge 62J17 is located at the southern end of the Project Corridor approximately 240 feet northwest of the intersection of Old Snelling Avenue and TH-51. The City of Arden Hills replaced the bridge in 2018. On November 20, 2018, three soil samples were collected from three separate stockpiles generated during construction. Soil samples SP-1, SP-2, and SP-3 were collected from Stockpiles A, B, and C, respectively. The samples were submitted for laboratory analysis of volatile organic compounds (VOCs), polycyclic aromatic hydrocarbons (PAHs), Resource Conservation and Recovery Act (RCRA) Metals, and diesel range organics (DRO). The following is a summary of the laboratory analytical results: · No detections of RCRA Metals or VOCs exceeded regulatory criteria. · Multiple PAH compounds were detected in the stockpile samples above laboratory reporting limits. Benzo(a)pyrene (BaP)-Equivalent concentrations of 1.6 milligrams per kilogram (mg/kg) were identified in stockpile samples SP-1 and SP-2, exceeding the