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Home My WebLink AboutDrainage Concerns ANDERSON ENGINEERING of Minnesota,LLC CIVIL ENGINEERING & LAND SURVEYING 13605 1st Avenue North,Suite 100• Plymouth,Minnesota 55441•Tel:763.412.4000• Fax:763.412.4090• www.ae-mn.com November 4, 2009 City of Orono — Engineering Department VIA email c/o Bonestroo 2335 Highway 36 West St. Paul, MN 55113 Attn: Tom Kellogg, PE — Bonestroo Re: Drainage Concerns 2687 Wayzata Blvd Orono, MN Long Lake Properties Commission #11586 Dear Mr. Kellogg: As discussed, we are sending to you for your review and approval proposed changes to the newly constructed drainage control and infiltration system at 2687 Wayzata Blvd, Orono as follows: 1. On Thursday, October 12, 2009 we met with our neighbor Morries Auto to discuss their concerns relating to the drainage of the 2687 property. In attendance were Morrie Wagener, Peter Johnson (Morrie's Attorney) Greg Engel (Long Lake Properties, LLC Representative), David Greening (Long Lake Properties, LLC Attorney), and Roger Anderson (Long Lake Properties, LLC Engineer). 2. Peter Johnson sent a letter to Long Lake Properties, LLC on September 14, 2009 expressing concern about the recent improvements/changes to the drainage system on the 2687 property. They noted that some of the work had been done on Morrie's property without a construction easement (rip-rap placement) and a drain the had been installed that provided a direct discharge into their storm sewer. 3. They also indicated that Morrie has spent a significant amount of money recently to meet the City and Watershed requirements and were concerned that any storm water could cause him problems. Their feeling was that all storm water from the 2687 property should drain north to the Trunk Highway 12 ditch, not to the south or the east. A Service-disabled Veteran Owned Small Business LAND DEVELOPMENT • MUNICIPAL • HIGHWAYS • RAILROADS SURVEYING • WETLANDS • ENVIRONMENTAL ASSESSMENTS Drainage Concerns Page 2 of 4 Long Lake Properties November 4,2009 2687 Wayzata Blvd,Orono,MN Comm#11586 4. After review of the current improvements, drainage documents going back to the early 90's, and with considerable discussion, we came to the following understandings: a. The established (historic) drainage pattern for a portion of the 2687 property is to the south and east onto Morrie's property. b. Morrie previously constructed a storm rip-rap ditch and overflow on the 2687 property to mitigate water issues along the westerly side of his building. The ditch and part of the rock overflow were constructed on the 2687 property. c. Morrie was concerned that the drain tile from the bottom of the rain garden provided a constant flow directly to their storm sewer during recent extended rain events. d. We briefly reviewed our approved plans and drainage calculations to clarify that, with the new infiltration basin in place, the quantity and rate of runoff to Morrie's site has been significantly reduced from historic flows. e. Of additional concern were the pond overflow elevation, outflow characteristics and the construction of the rip-rap overflow. f. We clarified that the drain tile was to provide temporary relief from flooding conditions in the pond while vegetation became established and the surface of the peat layer started providing the required filtering. It also was in place to provide long-term seepage out fall from the pond for"filtered" storm water to protect the vegetation at the bottom of the basin. After further discussion, we proposed the following, which we believe met everyone's approval, and which will resolve this issue: 1. We agreed to survey the completed pond to confirm design volume was met as constructed. We completed the as built survey work and the resulting survey showed the as-built volume to be approximately 15% above the design volume. 2. We also agreed to review the pond outfall, and to construct a concrete weir fixed at the approved design elevation. Our survey showed the current outfall rip-rap weir to be constructed slightly lower than the plan A Service-disabled Veteran Owned Small Business LAND DEVELOPMENT • MUNICIPAL • HIGHWAYS • RAILROADS SURVEYING • WETLANDS 9 ENVIRONMENTAL ASSESSMENTS Drainage Concerns Page 3 of 4 Long Lake Properties November 4,2009 2687 Wayzata Blvd,Orono,MN Comm#11586 elevation. The concrete weir (grouted rip-rap)would insure pre and post- design drainage and flow conditions are met per the drainage analysis The combined effect of the additional retention volume and the fixed outlet will further reduce the volume of discharge to the adjacent property. 3. After the vegetation is established in the basin (the end of June 2010±), we will cut off the drain tile and provide a cap which will allow only seepage flow necessary to protect the vegetation at the bottom of the basin. 4. The new riprap configuration on both the 2687 property& Morrie's property, which is wider than that previously constructed by Morries, will remain as is on both properties to provide slope protection in the case of major storm events. 5. Long Lake Properties, LLC will bear the cost of the improvements describes above. 6. We are prepared to complete the concrete outfall work this fall, as soon as approval can be obtained. Please find enclosed a sketch plan showing these proposed changes. Upon your review and approval of these proposed modifications we will proceed with construction of the weir and in time, modification of the drain the per our agreement with Morrie. We are copying Morrie's attorney, Peter Johnson, with this information to keep him appraised of our efforts to resolve this issue. If you have any questions, please contact me at (763)412-4000. Sincerely, Roger A. Anderson A Service-disabled Veteran Owned Small Business LAND DEVELOPMENT • MUNICIPAL • HIGHWAYS • RAILROADS SURVEYING 9 WETLANDS 9 ENVIRONMENTAL ASSESSMENTS Drainage Concerns Page 4 of 4 Long Lake Properties November 4,2009 2687 Wayzata Blvd,Orono,MN Comm#11586 Enclosure: Sketch Plan, As-built Stormwater Drainage Survey Cc: Morrie Wagener, WJM Properties Greg Engel, Long Lake Properties, LLC Peter W. Johnson David Greening, Briggs & Morgan, P.A. Attached: Revised stormwater calculations Outfall grouting sketch A Service-disabled Veteran Owned Small Business LAND DEVELOPMENT • MUNICIPAL • HIGHWAYS • RAILROADS SURVEYING • WETLANDS 9 ENVIRONMENTAL ASSESSMENTS Page 1 of 1 Kellogg, Tom P From: Mike Brandvold [mbrandvold@ae-mn.com] Sent: Wednesday, November 04, 2009 12:28 PM To: Kellogg, Tom P; Greg Engle; Greening, David Cc: 'Roger Anderson'; peterj@peterwjohnson.com Subject: Long Lake Properties 2687 Wayzata Blvd Drainage Attachments: 2687 Drainage Letter-report 11-4-09.pdf Mr. Kellogg: Attached is our cover letter, drainage calculations and sketch map relating to drainage concerns at 2687 Wayzata Blvd, Orono, MN. If you have any questions,feel free to contact Roger Anderson (763.412.4001) or myself. Sincerely, Mike Brandvold,P.E. Anderson Engineering of MN LLC 13605 1st Ave N -- Plymouth, MN 55441 763.412.4017 direct/763.412.4090 fax 612.916.9661 c mbrandvold@ae-mn.com 11/4/2009