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TCAAP AUAR Update 1 August 2019 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 Road 96 on the south, by Trunk Highway (TH) 10 and Interstate 35W (I -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. Since the study area has not been fully developed, the purpose of this document is to update the TCAAP AUAR pursuant to Minnesota Rules. This report is intended to serve as an update to the 2014 AUAR 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. However, since the AUAR was published, the following environmental remediation work and adjacent infrastructure improvement projects have been completed (see map in Attachment A): • 2015: o Demolition and remediation within the AUAR study area was completed. o The new interchange at I -35W and County Road 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 I-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 I-35W interchange was completed. County Road H now includes a new wider bridge over I-35W with two traffic lanes in each direction and a regional trail for bicycles and pedestrians. An off-ramp from I -35W northbound directly to County Road H was constructed. The Highway 10 westbound ramp to I-35W northbound was reconstructed to go over the new County Road H ramp. The project also included construction