07-14-25 - City Council Agenda - Laserfiche WebLink

Home Search

wsb Final Technical Memorandum To: Michael Grochala, City of Lino Lakes From: Henry Meeker, WSB Alison Harwood, WSB Date: May 23, 2025 Re: Stormwater Management— 1-35 Corridor AUAR City of Lino Lakes, Minnesota WSB Project No. 027919-000 INTRODUCTION The original Alternative Urban Areawide Review (AUAR)was completed and approved in September 2005. The AUAR analyzed the stormwater impacts of the three development ° scenarios. Based on the analysis, a Mitigation Plan was developed. c� w AUAR updates are required every five years from the original date of the approved AUAR. co Updates were prepared in 2010, 2015, and 2020. The 2020 update was made with draft scenarios of the Lino Lakes 2040 Comprehensive Plan, which was adopted in November 2020. This AUAR update is based on two development scenarios. It includes mitigation improvements co that have been completed at this time and the proposed future land uses. M The information and analysis outlined within this memo is intended to complete a portion of the AUAR Update related to Item # 11.ii—Water Resources—Stormwater related to two proposed development scenarios. This memo is intended to update the stormwater analysis provided in the original AUAR where applicable. Z WATER RESOURCES—STORMWATER ii. Stormwater-Describe the quantity and quality of stormwater runoff at the site prior to ° and post construction. Include the routes and receiving water bodies for runoff from the a site (major downstream water bodies as well as the immediate receiving waters). Discuss W Z any environmental effects from stormwater discharges. Describe stormwater pollution prevention plans including temporary and permanent runoff controls and potential BMP site locations to manage or treat stormwater runoff. Identify specific erosion control, o sedimentation control or stabilization measures to address soil limitations during and after LU project construction. 7) U) Procedures and Methods Followed U) The procedures and methods used to estimate the runoff volumes and pollutants loads within the D AUAR were based on the Natural Resource Conservation Service (NRCS) runoff curve number w method and event mean concentration pollutant values from the Minnesota Stormwater Manual. 'a Any development within the study area will be required to meet the stormwater standards of the a City of Lino Lakes and Rice Creek Watershed District (RCWD). These standards include: x • Promote volume control and groundwater recharge. • Protect water quality from nutrients, heavy metals, and other urban pollutants. M:\027919-000\Admin\Docs\Stormwater\MEMO-021725-Stormwater AP.docx Page 75 of 240 z