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X City of Arden Hills Page 16 of 63 October 7, 2022 8.3 RECOMMENDATIONS Based on the results discussed above, in general the existing soils along the proposed trail corridor are suitable for reuse during construction of the proposed trail and do not present significant risk to the project. However, some areas may need to be subcut by the Contractor, and some removal and replacement of existing unsuitable soils should be anticipated. Also, portions of the existing fill may contain organic material, and it is not recommended to reuse existing fill that contains debris or organic material as structural fill. Lastly, based on the soil borings, typical soil correction depths along most of the proposed trail alignment are anticipated to be about one to two feet. The recommended pavement section for the proposed trail is three inches of bituminous wear course over six inches of Class 5 or Class 6 aggregate base, which is based on a 20-year performance life for bituminous, including routine maintenance. Performance and condition of the pavement are affected by many factors, and it is recommended that a regular maintenance plan be developed to help ensure that the pavement performs well for last as long as possible. These brief comments follow those presented in the Geotechnical Evaluation Report, and this report also supports the recommendations of the Geotechnical Evaluation Report related to site drainage, construction disturbance, excavation oversizing, excavated slopes, pavement subgrade preparation, pavement subgrade test roll, engineered fill materials and compaction, and stormwater. Refer to the Geotechnical Evaluation Report in Appendix C for more information. 9.0 CONCLUSIONS AND RECOMMENDATION Constructing the remaining portion of the proposed trail will bring to fruition full connectivity along the main link in a network of trails connecting Arden Hills, and it is the hope that this report can guide the City in realizing the full benefit of the trail for years to come. The conclusions and recommendations outlined in this report are considered to be compatible with applicable MnDOT standards at this time. With an unidentified schedule for construction of the proposed trail, it may be necessary to reevaluate the standards for trail construction should MnDOT design guidance be updated before the final design phase of the project is completed. In the same way, a reevaluation of stormwater management and wetland conservation regulations may be necessary. Such changes may dictate alterations in the design of the trail and the scope of work required to accommodate construction. Lastly, although this construction work could be split into phases, with this size of a project it is recommended that the work be done under one contract for cost benefits.