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City of Mounds View Page 18 Ardan Avenue Drainage Subdistrict Analysis 000435-07129-0 The total estimated construction cost for all of the improvements identified in the 1989 Report is $688,000 (1989 dollars). However, as noted in Table 6.1, street and boulevard restoration costs were removed from this total cost to allow for a common comparison of construction items between the improvements identified in the 1989 Report and those identified in this Report. Also as noted in Table 6.1, the estimated construction costs from the 1989 Report do not include any costs for the construction of the East Detention Pond. The 1989 Report assumed that this pond would be constructed by a developer building in this area. The additional costs associated with the East Detention Pond would include: land acquisition, pond grading, and a pond outlet. Including these additional costs would significantly increase the estimated construction cost for the 1989 Report. In addition to the improvements recommended in this Report (see Map 1 in Appendix B), the 1989 Report identified other potential future costs associated with the Ardan Avenue Drainage Subdistrict improvements. While further investigation into these and other potential future costs is outside of the scope of this analysis, the City should consider the following potential future costs: Performing a stormwater analysis of the system downstream of the Ardan Avenue storm sewer system to determine if downstream improvements are warranted due to the impact of the Ardan Avenue improvements. If necessary, the construction of downstream improvements. 7.RECOMMENDATIONS The following is a summary of the recommendations identified in the previous sections of this Report: 1.Construct the storm sewer improvements identified on Map 1 in Appendix A. 2.With the installation of the Ardan Avenue trunk storm sewer improvements, the existing catch basin manhole rim elevation located in the rear yard of 8200 Redoak Drive should be lowered to match the adjacent ground elevation. 3.Further investigation into the rear yard flooding areas identified on Map 1 in Appendix B, with the investigation including: Further investigation to determine if beehive catch basin structures do exist along the 24” storm sewer north of Ardan Avenue between Nodes 31 and 33B and Nodes 38A and 39A. Discussions with property owners in this area to aid in identifying the drainage characteristics of specific landlocked areas. Whether rear yard depression areas have functioning overflows that provide protection to adjacent homes. The feasibility of providing storm sewer to drain the rear yard depressions. 4.Consider the potential future costs associated with improvements recommended in this Report, including: Performing a stormwater analysis of the system downstream of the Ardan Avenue storm sewer system to determine if downstream improvements are warranted due to the impact of the Ardan Avenue improvements. If necessary, the construction of downstream improvements.