04/25/2001 Env Bd Packet - Laserfiche WebLink

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..tn. .. 1 u . . .....r1 m,. r.v .,- 1 Mr. Jell' Smyscr April 10.2001 Page 2 N. I w wt, u0I I I L I:7I' -- u:7I VOL 4•WW Finally, the Spirit Hills development appears to contain some areas of steep slopes. We recommend that construction in these steep slope areas follow the requirements listed in Section 1102.07, Subdivision 2, f3,5 in which work on these slopes is minimized and the erosion control plans for the work approved by the City Engineer. In addition to the cummcmts relating to the City of Lino Lakes Shoreland Management Regulations, we have the following comments to offer: 1 • We are pleased to sec that DNR Protected Water, Rice Lake (2 -0008 P) and its Ordinary 1 high Water (OHW) level of 883.1' (NGVD, 1929) are shown on the preliminary plat of Spirit Hills Development. Please bc aware that any work below the O1-1W of Ricc Lake (including stormwatcr outfhll installation) is under the jurisdiction of the DNR, and may require a DNR Protected Waters Permit. 2. While it is good to see that two sediment basins arc being designed for the Spirit Hills Development, other techniques that reduce thc amount of stormwater that needs to bc treated should bc incorporated into Spirit Hills because sediment ponds remove only a fraction of the pollutants in stormwatcr before it is discharged into Rice Lake. Whenever the curbs, gutters and stormsewers of a street should he replaced with wide, shallow swalcs because swalcs can remove some pollutants and infiltrate some water. Stormsowers simply funnel pollutants to the sediment ponds. Stounwater swages work best when they contain. native vegetation that' is mowed only once a year. in addition, Lino Lakes should consider the use of other low impact development techniques for dealing with stormwatt= including using rain gardens, dry wells, permeable pavements, infiltration trenches, and other similar techniques. The grading of the Spirit Hills site: should be minimized in order to avoid compacting the soils. In landscaped ercas where grading has occurred, a ripper should be used to loosen the soils and partially restore the infiltration capabilities of the site. 3. Rice Lake has a 1% (104 year) flood elevation of 8A6.0' (NGVD, 1929). In addition, the wetlands and sediment ponds of SpiritHills development will also have 1% flood levels of their own. We encourage the City of Lino Lakes and the Rice Creek Watershed District to take steps to ensure that the structures that are constructed in Spirit Hills development will not be flooded by any nearby body of water. 4. If construction involves dewatering in excess of 10,000 gallons per day, or 1 million gallons per year, a DNR appropriations permit is needed. Applications for less than 50 million gallons may be approval under a general permit for dewatering and typically takes five (5) days to process. 5. if construction activities disturb five acres of land, or more, the contractor must apply for a stortnwater permit from the Minnesota Pollution Control Agatcy (Keith Cherryhohnees at 651- 296 - 7036). 6. The comments in this letter-address DNR Waters jurisdictional matters and concerns. These comments should not be construed as DNR support or lack thereof for a particular project. I apologize: for thc untimeliness of these comments and thank you for submitting the preliminary plat and rezoning request of Spirit Mils Development to the DNR for review. We request that you send copies of the Spirit Hills development decision to Tom Hovey at the above address. We look forward to receiving other #3/4