05/25/2016 Environmental Board Minutes

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Evironmental Board May 25, 2016 Page 2 APPROVED MINUTES A. Lino Lakes NE Drainage Area Study Update Ms. Thompson from WSB & Associates presented an update on the NE Area Drainage. The NE Area Drainage feasibility study models the drainage for 1400 acres of land on the east and west side of I-35E, and north of Main Street. The study evaluates water quality improvements and a new surface water outlet to Peltier Lake. Implementation of the plan will require approval from Rice Creek Watershed District (RCWD). The draft feasibility study was completed in January 2016 and submitted to City staff for review. After review by the Environmental Board and City staff, a new greenway option is now being considered. The new option includes the new culvert crossing under I-35E, storm sewer and regional storage facilities, and an open-channel greenway between Peltier Lake and 20th Ave. The greenway option also provides additional water quality treatment opportunities for the study area, above and beyond the City’s and RCWD’s development requirements. The new alignment takes advantage of a culvert crossing under Peltier Lake Drive and utilizes an existing drainage way. This is in line with City’s AUAR and proposed trail and greenway alignments. Also most flexible option for future development because of an earthen channel it can be moved when the land becomes available for future development. There was two meetings with the affected landowners to discuss impacts to property and drainage systems, as well as to hear their opinions on the project alignments. After the meeting with Rice Creek Watershed District, it was determined that at the concept level, water quality impacts could be evaluated using a simple land use analysis. The analysis is based on a 1.1 inch rainfall depth, which corresponds to the RCWD volume treatment requirements. Ms. Bor asked if there were going to be improvements to Peltier Drive because of the road being under water in the spring time. Ms. Thompson said yes there may be some road improvements that my need to be done. It may be raised in order to get the culvert in and since it is a City road the city would be reasonable for maintaining the road. Ms. Thompson then said the next steps are to finalize the feasibility study with the new alignment and present the study to the City Council on June 6, 2016. Submit Comprehensive Stormwater Management Plan to RCWD for review. Which