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Home My WebLink About6.f. Hiring of Water Resources EngineerCITY OF ROSEMOUNT EXECUTIVE SUMMARY FOR ACTION CITY COUNCIL MEETING DATE: MAY 15, 2001 AGENDA ITEM: HIRING OF WATER RESOURCES AGENDA SECTION: ENGINEER CONSENT PREPARED BY: PAULA GRAFF, AGENDA NO. HR COORDINATOR 21 la ATTACHMENTS: NONE APPROVED BY: For City Council consideration is a recommendation to hire Mr. Chad Donnelly for the position of Water Resources Engineer. The City received eight applications for this position, six of which were interviewed. The panel agreed that Mr. Donnelly is well qualified for position; he has a degree in Civil Engineering from North Dakota State University and has worked a private engineering firm as an engineering aide for the past two years. Mr. Donnelly has accepted a conditional offer of employment, which requires the successful completion of a pre- employment physical. Provided these conditions of employment are satisfied, his first day will be May 21, 2001. RECOMMENDED ACTION: MOTION TO APPROVE THE HIRING OF CHAD DONNELLY FOR THE POSITION OF WATER RESOURCES ENGINEER. COUNCIL ACTION: 1 May 15, 2001 Mayor Busho and City Council Members City of Rosemount 2875 145' St W Rosemount MN 55068 Dear Mayor Busho and City Council Members, We have repeatedly expressed concern about the water level on our property. We have at our own expense hired an engineering firm to review the plans from the City to ensure we are doing everything we can to protect our property. We have attached a letter from our engineer with preliminary findings. We are requesting that the city not move forward with any development that impacts our water level. Two weeks ago in the discussion of the Ever 4 addition we were assured no water came from that site to our pond. That was also stated at the public hearing requesting changes and additional units. Now we discover that in fact the northern portion does drain through a series of ponds to our property. Most alarming is the calculations done by our engineering firm put the water level at 917 with a 9 CFS pump. We cannot understand how the city can move forward with further development when we have these discrepancies. We urge you to first put the solution in place that corrects the storm water run off prior to moving forward with any further development. We have also hired a surveyor to plot the 914 elevation that you have indicated the water level will be at. At the last meeting you talked about needing seven tenths of an acre from us. While that may not sound like much land to you, the attached pictures tell the story of how close 914 comes to our house. The stake shows the 914 elevation. The water is this close to our house even though we have built as far north as we were allowed to. You will destroy our property if you go forward with the current plan. We do not understand why one resident has to bear all the storm water runoff when it could be intercepted on the Evermore property and pumped from there. You have time to correct this now. Please help us. Sincerely, I �� 1)7 0-,4 C-a Ken Marcotte Faye Marcotte 12931 Shannon Parkway Rosemount, MN 55068 651- 423 -5024 Fax: 651- 322 -5584 Email: kmarcotte@gwest.net :" lvi3uwac u�Yoa... Subject: Re: Marcotte update Date: Tue, 15 May 2001 17:08:22 -0500 From: "Steven Klein" <Sklein @barr.com> To: kniarcotte@uswest.net CC: Sklein@b=.com The following is a summary of our technical review of information related to the water quality and flooding problems you have experienced on your pond. Water Quality Issues It is clear that there was minimal erosion control measures installed by the contractor /owner of the Evermore Addition. These measures were likely not in conformance with the NPDES permit issued by the MPCA for the development if such a permit was even issued. There was little or no attention to the maintenance of the erosion control measures on the Evermore development. In addition, the planned piped outlet from the northerly most pond on the Evermore Development was never installed and as a result that pond overtopped and eroded much of the bank /hill downstream of the Evermore pond. he eros ended u in the that ended up i l n p hot o s i is ob vious Pond is that the significant. ore Pond Therefore we recommend: A) the city install the piped outlet from the Everm and that it discharge at the normal level of the Marcotte Pond with riprap and filter placed from the end of the pipe to the bottom of the pond, B) The overflow swale from the Evermore Pond to the Marcotte Pond be armored with a permanent non -photo degrading geotextile so that (if the pond overtops because the pipe /pond can not handle the flows) the downstream bank /hill won't erode and end up in the Marcotte Pond again, C) The eroded material that has flowed into the Marcotte Pond be removed by the contractor /developer and the sediment laden banks or area disturbed by construction activities be restored to the Marcotte "s satisfaction . There is a pipe that discharges into the Marcotte Pond from Shannon Parkway that discharges on the bank well above the normal level of the pond. The rock placed downstream of this pipe is not protecting against on -going erosion and is now falling into the eroded scour that is occurring. This erosion is also ending up in the Marcotte Pond. We recommend that the rock be removed and a properly designed riprap and filter be placed around the outlet of the pipe and continuing downhill to the bottom of the Marcotte Pond. Otherwise, the erosion will continue to degrade the water quality of the Marcotte pond and the outlet pipe will ultimately fall off in sections into the eroded scour caused by the improper placement of permanent pipe erosion control facilities. water Quantity Concerns >From a preliminary review of the city's current surface water management plan we have identified some errors in the drainage area computations. I have been told by Brett Weis of WSB that WSB remodeled the entire drainage area to the Marcotte Pond. If the remodeling work done by WSB used input information from the city's current surface water management plan, then the WSB remodeling may also be in error. We have performed a series of preliminary hydrologic and hydraulic computations to see if we agree with the flood levels projected by WSB using a 9 cfs or 15 cfs pumped outlet facility. Our preliminary computations indicate the flood level based on a 9 cfs pump and a 15 cfs pump to be 917.2 and 912.7 respectively. This compares to 914.4 and 911.0 respectively as reported by WSB at the Utility Commission meeting last week. Elevation 918 is close to the low floor entry elevation of the Marcotte's home. Based on our computations the 9 cfs pump station would provide an acceptable freeboard between the flood level and the low floor entry of the Marcotte's home. However, Barr's computations are not based on the most recent 5/15/015:34 PM 1 of 2 Ke: Niarcove upuaw topography maps of the Marcotte pond and this may explain some of the difference in Barr's vs WSB's computed flood levels. We show the most critical of the 100 -year flood events to be the 10 day snow melt event and believe the WSB flood levels considered the 10 -day 100 -year snow melt as well. Given the difference in computed flood levels ( especially for the 9 cfs PUMP option ) and until we can input more accurate topographic information into our model, I would be very concerned about selling the city an easement for added flooding until we can make a better determination as to what the agreed upon flood level should be. We strongly suggest a 15 cfs pump station because A) it likely will not be significantly more expensive than a 9 cfs pump station, B) it will give the Marcottes at least 5 feet of free board between the 100 year flood level and their low floor entry. So if a storm occurs that is greater than a 100 year event or if the power goes out for an extended period of time or there is a problem with the PUMP station, the added freeboard will help protect the Marcottes, and C) and it will provide the Marcottes more ease of mind when it comes to being concerned about their house being flooded. We strongly suggest that a dual -pump pump station be designed for the Marcotte Pond so that in the event a pump goes down there is an additional pump ready to handle the flows. In addition to these design considerations, we suggest that the city make an analysis to see if a pump station placed at a much higher elevation on the Evermore Addition would be feasible. This station could capture a significant amount of the flows from Evermore and the drainage area to the south, and direct them away from the Marcotte pond. It would allow the city to manage a large amount of water originating at significantly higher elevations and in turn would not have to be pumped up such a significant incline. The water could be captured in the Evermore pond at the top of the 30 to 50 foot high hill that leads down to the Marcotte Pond. This in turn could provide the Marcottes more freeboard and more ease of mind. 2 oft 5/15/015:34 PM