20230104 Environmental Board Packet Combined

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Shenandoah Improvements Feasibility Report City of Lino Lakes, MN WSB Project No. 018901-000 Page 1 1.0 Introduction This report provides the City of Lino Lakes and the Rice Creek Watershed District (RCWD) with a series of four (4) conceptual designs and associated water quantity and quality models for implementation of best management practices (BMPs) within Shenandoah Park. These designs address water quality within an aged part of the City of Lino Lakes’ stormwater conveyance system draining to Rice Lake (AUID 02 - 0008 -00) which was listed as impaired for nutrients (total phosphorous) in 2010. Shenandoah Park was identified as a location for the installation of BMP retrofits to improve stormwater quality and reduce the volume of stormwater runoff as part of the Rice Lake Subwatershed Stormwater Retrofit Assessment completed in 2010. While this assessment provided site specific information and load reductions, the assessment report indicated that additional modeling was required for the Shenandoah Park stormwater improvements. In addition to developing t he conceptual designs discussed in this report, WSB also updated the existing InfoSWMM model used by RCWD, developed a P8 model, generated construction estimates for each of the four (4) concepts, and drafted a list of required permits from local, state, a nd federal entities. Through a series of meetings with City and Watershed District staff, WSB developed the four (4) concepts discussed in this report to meet the following goals: 1. Reduce total phosphorous (TP) and total suspended solids (TSS) loading withi n the ditch system and to downstream waterbodies, specifically Rice Lake . 2. Enhance the amenities, aesthetics, and recreational opportunities within the park . 3. Increase floodplain volume within the subwatershed . 4. Restore and rehabilitate park vegetation that w ill provide wetland functional lift . 2.0 Project Location The proposed improvements are located within the City owned parcels for Shenandoah Park, in the southwestern corner of Lino Lakes. The street addresses for the parcels containing the proposed work are 4 75 Arrowhead Dr on the south and 498 Birch St on the north. The surrounding properties are either residential or public right of way, with the exception of an existing stormwater pond east of the park. The project location is within the watershed for Rice Lake, which is situated approximately 1,800 feet north of the park. 3.0 Site Description The project is proposed on City park property. Currently the southern portion of the site is largely mowed turfgrass with a play area to the east and a grove of trees to t he north. Beyond this grove of trees, the majority of the site is vegetated with reed canary grass and nettle. A stormwater BMP was constructed in the upland northern portion of the project location to treat runoff from the reconstruction of Birch St in 2021.