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City of Arden Hills – 2040 Comprehensive Plan Approved:, 2018 6-17 per net residential acre. Densities lower than this are not an efficient use of the region’s sanitary sewer infrastructure. Net residential acreage is calculated by subtracting wetlands, water bodies, public parks, arterial streets, and identified natural resources that are protected by ordinance from gross acres. The number of net residential acres is then divided by the number of lots to determine net residential density. According to the 2016 land use data provided by the Metropolitan Council, there were 1,362 acres of net residential land in Arden Hills, which includes the rights- of-way of adjacent City streets. The Metropolitan Council lists 3,198 housing units in Arden Hills in 2015. Based on that information, the residential density in the developed portion of Arden Hills is approximately 2.35residential units per net residential acre. While this is below the five units per net residential acre required by the Metropolitan Council, the City is not required to raise densities in the built portion of Arden Hills. However, all future land uses should be able to accommodate development in average of five units per net residential acre. There are no expected land use changes that would result in a reduction in net residential density in the developed part of Arden Hills. Furthermore, the remaining vacant residential land that is south of Highway 96 and 10 is guided for development that could be built at a density of an average of five residential units per acre. The approved Master Plan for the TCAAP property includes 162.2 acres of residential land and a maximum of 1,460 residential units for an overall maximum gross density of 9.00 units per acre. The gross density includes the neighborhood collector roads; however, it excludes parks, arterial roads, and the water infrastructure. 6.4.11 Staged Development Since the areas south of Highways 96 and 10 are considered fully developed and there is relatively little vacant property, a five year staged development has not been developed. While a small amount of vacant land exists in the developed portion of the City, development on the vacant land is unlikely to have a significant impact on the City’s or region’s infrastructure. As previously noted in Chapter 5 the demolition and remediation of the TCAAP site was completed in November 2015. Grading of the site and the construction of the main roadway are expected to begin in 2019. At this time, it is expected that private development will begin in late 2019 or 2020. The project is anticipated to be completed in phases over the next 10 to 20 years; however, the Draft 04/04/2018