10-12-2022 Council Packet - Laserfiche WebLink

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Prepared by: Bolton & Menk, Inc. Proposed Improvements Twin Lake Boulevard ǀ 0N1.125376 Page 6 PEDESTRIAN AMENITIES There are no existing pedestrian amenities along Twin Lake Boulevard. Ramsey County is currently in the preliminary planning process for a regional trail along Vadnais Boulevard from County Road E to Rice Street. PROPOSED IMPROVEMENTS STREETS Based on the pavement age, pavement distresses, and sub-soil information, the proposed street improvement for Twin Lake Boulevard is a full-depth reclamation (FDR). FDR would grind, pulverize, and mix the existing aggregate base with the existing bituminous pavement. This mixture will be directly re- used as aggregate base. The excess reclaim material that must be removed to make room for the new bituminous can be salvaged for reuse on site as needed for construction. This is an economical and environmentally friendly way to reuse construction materials. The existing asphalt curb between Bankers Drive and Mayfair Road is proposed to be replaced with B618 concrete curb and gutter. Concrete ribbon curb is proposed for the rural sections of roadway west of Bankers Drive and east of Mayfair Road where no curb currently exists. Ribbon curb does not have a back to it, maintains existing drainage patterns, and promotes the structural integrity and overall life of the pavement. The pavement is proposed to be reduced from 32 feet wide to 28 feet for the section of roadway between Bankers Drive and Mayfair Road. The reduction in street width will help reduce impacts associated with bituminous trail construction in this area; there are several driveways, landscaped boulevards, and steep slopes in this area. Given the low-volume nature of this roadway, both in its current state as well as after development of the new high-density housing units, reduction of the road will not impact traffic operations or overall level of service. Additionally, roadway narrowing can promote these secondary benefits: • Construction cost savings • Long-term maintenance cost savings (crack sealing, mill & overlay, etc.) • Reduced impervious surface results in reduced stormwater treatment requirements and associated costs • Reduction in volume of snow removal • General traffic calming and speed reduction As part of the road improvements, each residential driveway will receive a new concrete driveway apron. The driveway area behind the concrete apron will be saw cut and restored with like material, as necessary. Due to resident concerns during the preliminary approval process for the planned multi-family housing developments, turn lanes on Twin Lake Boulevard approaching the Bankers Drive intersection were evaluated. The traffic volumes on Twin Lake Boulevard do not meet the threshold to trigger warrants that would recommend turn lane construction. In coordination with Ramsey County staff, City of Little Canada and City of Vadnais Heights staff have scoped a proposed realignment of Twin Lake Boulevard at it approaches Vadnais Boulevard near the east end of the project. The realignment would provide better sight lines and a safer intersection for traffic. Selective clearing of brush and trees is also proposed and would further improve sightlines. Refer to Figure 3 in Appendix A for a depiction of the proposed roadway improvements.