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1. Introduction The Twin Cities Army Ammunition Plant (TCAAP) Alternative Urban Areawide Review (AUAR) study area is 429 acres located within the broader TCAAP site in Arden Hills. Ramsey County purchased 427 acres of the site in 2013, and Ramsey County Parks & Recreation owns the remaining 2 acres. The AUAR study area is bounded by County State Aid Highway (CSAH) 96 on the south, by US Highway 10 and Interstate 35W (1-35W) on the west, by State of Minnesota property on the north, and by the National Guard's Arden Hills Army Training Site (AHATS) property on the east (see Figure 1). As the Responsible Governmental Unit (RGU), the City of Arden Hills adopted the TCAAP Final AUAR and Mitigation Plan on July 28, 2014. Pursuant to Minnesota Rules, part 4410.3610, subpart 7, an AUAR and plan for mitigation must be revised every five years until all development in the study area has received final approval. The City of Arden Hills adopted an AUAR Update on August 26, 2019. Since the study area has not been fully developed, the purpose of this document is to provide another update to the TCAAP AUAR pursuant to Minnesota Rules. This report is intended to serve as an update to the 2014 AUAR and 2019 AUAR Update and includes information on development to date, an update to the environmental analysis where necessary, and a review of mitigation measures. 2. Existing Conditions No residential, retail, or commercial development has occurred within the AUAR study area. Since the AUAR was published in 2014, the following environmental remediafion work and adjacent infrastructure improvement projects were completed and were documented in the 2019 AUAR Update: • 2015: o Demolition and remediafion within the AUAR study area was completed. o The new interchange at 1-35W and CSAH 96 was opened to traffic, including a new bridge with accommodations for pedestrians and bicycles. • 2016: o Meanders were reintroduced within a portion of Rice Creek between County Road I and County Road H to facilitate the reconstruction of the County Road H and 1-35W interchange. The new creek alignment was evaluated in a separate Environmental Assessment Worksheet completed by Ramsey County. • 2017: o Construction of the County Road H and 1-35W interchange was completed. County Road H now includes a new wider bridge over 1-35W with two traffic lanes in each direction and a regional trail for bicycles and pedestrians. An off -ramp from 1-35W northbound directly to County Road H was constructed. The US Highway 10 westbound ramp to 1-35W northbound was reconstructed TCAAP AUAR Update April 2024