Agenda - Council - 08/22/1994 - Laserfiche WebLink

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roadway has been a part of the City's transportation plan since 1974. All of the community's long range planning west of Krypton Street is based on the connection of this proposed collector to provide access to these areas. The projected APT for existing and proposed 0evelopments in this area is 5000 to 5800 trips per day. This volume necessitates a collector street since alternative use of local residential streets would accomodate a maximum of 750 trips per day. A "no i~uitd" alternative is thus, not an option. Alternatives ¼;etland I 1 The existing Sunfish Lake Drive ends immediately east of 114P. The proposed roadway links to the existing road unavoidably impacting approximately 23,430 square feet (0.55 acres) of the east arm of this wetland. The only options are whether it is more prudent, practical and feasible to place box culverts or bridge this wetland rather than fill. The alignment study details the costs associated with three options; 1) bridge $513,000, 2) box culverts- $502,000 or 3) fill practical. The crossing of the westerly arm of 114P impacts approximately 2700 square feet (0.06 acres) of wetland. In order to avoid this wetland area, the route must swing south and then west with a comparatively poor alignment making it difficult to achieve the 40 mph design speed, if the road alignment shifted south to avoid this narrow corssing, the re"sultin9 shift would impact a considerable larger area in the east arm of the basin. Thus, the proposed alignment is the one which impacts the least amount of wetland. In addition, a somewhat unique, wooded knob of higher ground lying between these Two wetland arms of 114P would be destroyed with the Alternative lB alignment. Wetland 673W This wetland would be impacted in Phase 2 of the project w, ith the selected alignment, 2B. Approximately 22,530 squear feet (0.52 acres) of wetland are impacted with the proposed 673 were impacted with the proposed crossing. While avoidance of wetland impacts is desired, this wetland would also be impacted regardless of the selected alignment, 2A, B, or C. The issue then becomes, Which alignment balances an acceptable environmental impact on the wetland with safety, impacts on other habitat, impacts on residents, as well as other factors As indicated by the Anoka Co. Hwy Depar-[menz review letter of February 1, 199~ and the alignment study, Alternative 28 bes~ achieves this balance. The other two alignments by comparison are neither prudent nor practical when safety concerns are factored in.