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Comprehensive Stormwater Management Plan Northeast Lino Lakes Drainage Improvement Project WSB Project No. 2929-79 Page 2 1 INTRODUCTION The City of Lino Lakes submits this CSMP to the RCWD for the Northeast Lino Lakes Drainage Improvement Project. The goal of this CSMP is to document how future development within the project area will meet RCWD Rule C requirements using a regional stormwater management approach. This CSMP presents the approach for meeting the water quality treatment and peak stormwater runoff control requirements. The RCWD Rules adopted at the time of printing were effective on January 1, 2017. This CSMP documents the existing and proposed stormwater-related impacts for the Northeast Lino Lakes Drainage Improvement Project. The main components of this plan include a detailed analysis of the existing site conditions and limitations, as well as a conceptual design of the proposed regional best management practices (BMPs). These BMPs have been modeled based on recently-submitted development plans, ghost plats and discussions with landowners. The goal of this plan is to document a conceptual design that will guide future development of the area, while alleviating stress on the existing drainage system, and meeting the intent of the RCWD Rules C.6 and C.7. 1.1 Project Location The Northeast Lino Lakes Drainage Improvement Project is in Anoka County primarily within the City of Lino Lakes, Minnesota, but includes portions of the City of Hugo. The site is a 1,350-acre area that is bounded by Main Street to the south, the City of Hugo to the east, Peltier Lake to the west, and Rehbein Street to the north (Figure 1, Appendix A). The City of Lino Lakes is the largest municipality by percentage of area within the RCWD and project site is located entirely within the RCWD boundary in the Middle Rice Creek planning region (RCWD 2016). Land use in this area is predominantly agricultural (Figure 2, Appendix A). Much of this watershed currently drains to the south to Clearwater Creek via field drains. Clearwater Creek is impaired for aquatic life and has had a history of significant bank erosion problems. Additional information and discussion of existing conditions is provided in Section 2. 1.2 Drainage Areas and Resources of Concern The CSMP area is located within the Clearwater Creek Drainage Area and the Peltier Lake Resource of Concern (RCWD Drainage System Data 2017) (Figure 3, Appendix A). The area is currently serviced by three Anoka County drainage systems: Anoka County Ditch (ACD) 72 in the north Judicial Ditch (JD) 2 in the north ACD 55 in the south ACD 72 and JD 2 discharge directly to Peltier Lake, while ACD 55 enters Clearwater Creek (also known as JD 3), to the south before discharging to Peltier Lake. The remainder of the study area surface flows directly to Peltier Lake. Peltier Lake has been listed as an impaired waterbody within the greater Anoka Chain of Lakes since 2002 for aquatic recreation, with the main pollutant identified as excess phosphorus from watershed runoff and internal loading (Minnesota Pollution Control Agency 2013). RCWD has an average total phosphorus concentration within the lake of 224 µg/L, average chlorophyll a of 107.0 µg/L, and a transparency of 1.0 meters, all indicating relatively opaque water and poor water quality (RCWD 2016). Additionally, the Anoka Chain of Lakes has limited flood storage capacity (Houston Engineering, Inc. 2013). Any improvements to the drainage system will need to show no adverse impacts to receiving waters, as defined below: No damage to structures, buildings, and infrastructure as a result of an increase in flooding (increased water surface elevations, velocities, or number of days of inundation);