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<br /> <br /> <br />Field Investigation Report <br />Old Snelling Avenue and County Road E Improvements <br />WSB Project No. R-015447-000 Page 1 <br /> <br />1. Introduction <br /> <br />WSB was retained by the City of Arden Hills (City) to conduct a Field Investigation for the proposed Old <br />Snelling Avenue and County Road (CR) E Improvements project located in Arden Hills, Ramsey County, <br />Minnesota (the Project Corridor). The Project Corridor is a north-south segment totaling approximately <br />0.90 miles in length. The Project Corridor extends from Trunk Highway (TH) 51 at the south end to <br />approximately 600 feet north of CR E (approximately Arden Oaks Drive) at the north end. The Project <br />Corridor also includes a proposed roundabout intersection at CR E. A Project Corridor Location map is <br />included as Figure 1. <br /> <br />WSB completed a Phase I Environmental Site Assessment (ESA) for the Project Corridor dated February <br />28, 2020. The Phase I ESA identified two recognized environmental conditions (RECs) associated with <br />the Project Corridor. The purpose of the Field Investigation is to: 1.) determine if the identified RECs <br />have resulted in soil, groundwater, and/or soil vapor impacts at the Project Corridor and 2.) provide data <br />to support the proper management of excavated material that will be generated during reconstruction. <br /> <br />This Field Investigation has been prepared exclusively for the City. No additional parties can rely on the <br />information in this report without written permission from WSB. <br /> <br />1.1 Previous Investigations <br /> <br />The previous environmental reports/documents have been prepared for the Project Corridor: <br /> <br />· Contaminated Soil Encountered During Old Snelling Avenue Bridge 62J17 Replacement, <br />email correspondence and laboratory analytical reports dated between November- <br />December 2018, by multiple consultants (2018 Bridge 62J17 Replacement); <br /> <br />· Geotechnical Boring Logs, Old Snelling Avenue Roadway Improvements, dated October <br />3-4, 2019, by Northern Technologies, LLC (NTI) (2019 Geotechnical Borings); <br /> <br />· Memorandum, Information Pertaining to Spills, Tanks, Response Calls, or Other <br />Environmental Concerns, Snelling Avenue North, Arden Hills, dated February 10, 2020, <br />by the City of Arden Hills (2020 Memo); <br /> <br />· Desktop Contamination Review, Old Snelling Avenue & County Road E Improvements, <br />Arden Hills, Minnesota, dated January 23, 2020 by WSB (2020 Contamination Review); <br />and <br /> <br />· Phase I Environmental Site Assessment, Old Snelling Avenue & County Road E <br />Improvements, County Road E to Trunk Highway 51, Arden Hills, MN 55112, dated <br />February 28, 2020 by WSB (2020 Phase I ESA). <br /> <br />Copies of the previous environmental documents are available from WSB by request. The <br />following is a summary of the previous environmental reports: <br /> <br />2018 Bridge 62J17 Replacement <br /> <br />Bridge 62J17 is located at the southern end of the Project Corridor approximately 240 feet <br />northwest of the intersection of Old Snelling Avenue and TH-51. The City replaced the bridge in <br />2018. On November 20, 2018, three soil samples were collected from three separate stockpiles <br />generated during construction. Soil samples SP-1, SP-2, and SP-3 were collected from <br />Stockpiles A, B, and C, respectively. The samples were submitted for laboratory analysis of <br />volatile organic compounds (VOCs), polycyclic aromatic hydrocarbons (PAHs), Resource <br />Conservation and Recovery Act (RCRA) 8 Metals, and diesel range organics (DRO). The <br />following is a summary of the laboratory analytical results: