Laserfiche WebLink
Ms. Katie Larsen <br />June 6, 2018 <br />Page 3 <br /> <br /> <br /> S:\Community Development\Projects\Planning Cases\Nature's Refuge\Staff Reports\20180611 CC (RZ & PUD PP)\20180611 v2 (revised 20180608)\a2 2018060 <br />Basin NWL HWL <br />Pond 100 902.5 905.2 <br />Pond 200 901.5 902.6 <br />Pond 300 902.0 Confirm 902.5 <br />Pond 400 901.8 902.7 <br />Basin 10 N/A 907.3 <br />Wetland C 902.0 903.1 <br /> <br />Per the submitted modeling the rate control for the site does not increase. The majority of <br />the discharge leaving the site is through ACD 10-22-32. <br /> <br />Comments: <br /> <br />1. RCWD is the ditch authority for ACD 10-22-32 and is responsible for the maintenance, <br />function and capacity of the ditch. The City of Lino Lakes would be responsible for <br />Pond 200 maintenance and function. The ditch, and its associated rights, extend east <br />and shall not be routed through the pond. The easement will extend around the north end <br />of the pond to provide RCWD with the access needed. This has been discussed with the <br />watershed. Applicant shall address water quality calculations, and confirm <br />whether Pond 200 is necessary for water quality treatment for the impervious <br />surface increase. If the pond is not necessary to meet water quality treatment, then <br />similar to Pond 300, Pond 200 is recommended to be private and be maintained by <br />the Home Owners Association. If Pond 200 is necessary for water quality <br />treatment, the applicant shall work with the City as well as the RCWD Ditch <br />Authority. Pond 200 should be 2 cells separating ACD 10-22-32 into one basin, and <br />the City Pond into a second basin as needed for water quality. <br />2. Pond 300 is not considered a stormwater pond. It doesn’t meet the requirements for <br />water quality treatment due to the depth. It was not included as part of the water quality <br />calculations. It is recommended that this borrow area should be private and <br />maintained by the Home Owners Association.. Comment Noted <br />3. The applicant needs to adjust the location of the outlet control structures such that City <br />can access and maintain. Specific to Pond 200. Access is provided to outlet control <br />structures. <br />3A. Applicant to confirm that RCWD Ditch Authority to maintain outlets and <br />culverts within ACD 10-22-32 easement and submit information to the City. <br />4. The applicant shall include the 10-day snowmelt event in modeling and update the <br />proposed 10-day snowmelt HWLs on the plans. 10-day snow melt added to the models <br />and report. <br />Applicant shall include the modeled 10-day snowmelt HWLs on the plans. <br />5. The applicant shall confirm the amount of new impervious. There are different numbers <br />in Section 1.2 and Section 2.5 of the Stormwater Management Plan, Section 2.2 of the <br />Stormwater Pollution Prevention Plan (SWPPP), and the HydroCAD modeling. New <br />impervious area has been recalculated and confirmed.