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HomeMy WebLinkAboutCorrespondence 4646 Dakota Street S.E. Prior Lake, MN 55372-1714 April 20, 2009 JERRAD ROBINSON 16035 NORTHWOOD ROAD PRIOR LAKE, MN 55372 RE: DRAINAGE OF PROPERTIES LOCATED AT 16037,16035, AND 16033 NORTHWOOD ROAD Dear Mr. Robinson, Enclosed please find a drainage analysis performed by an independent consultant hired by the City to review the drainage issues in this area. This drainage analysis was performed last fall as a result of continued concern regarding the drainage in this area. If you have any questions regarding this matter, I can be reached at 952-447-9832. Sincerely, /~ ~_._. ~~oppler Assistant City Engineer City of Prior Lake CC: Frank Boyles, City Manager www.cityofpriorlake.com Phone 952.447.9800 / Fax 952.447.4245 4646 Dakota Street S.E. Prior Lake, MN 55372-1714 April 20, 2009 THOMAS J & MICHAELA F DALSIN 16033 NORTHWOOD ROAD PRIOR LAKE, MN 55372 RE: DRAINAGE OF PROPERTIES LOCATED AT 16037, 16035, AND 16033 NORTHWOOD ROAD Dear Mr. and Mrs. Dalsin, Enclosed please find a drainage analysis performed by an independent consultant hired by the City to review the drainage issues in this area. This drainage analysis was performed last fall as a result of continued concern regarding the drainage in this area. If you have any questions regarding this matter, I can be reached at 952-447-9832. Sincerely, ?7'~- Larry Poppler Assistant City Engineer City of Prior Lake CC: Frank Boyles, City Manager www.cityofpriorlake.com Phone 952.447.9800 / Fax 952.447.4245 4646 Dakota Street S.E. Prior Lake, MN 55372-1714 April 20, 2009 DR. BRUCE DUMKE 16037 NORTHWOOD ROAD PRIOR LAKE, MN 55372 RE: DRAINAGE OF PROPERTIES LOCATED AT 16037, 16035, AND 16033 NORTHWOOD ROAD Dear Dr. Bruce Dumke, Enclosed please find a drainage analysis performed by an independent consultant hired by the City to review the drainage issues in this area. This drainage analysis was performed last fall as a result of continued concern regarding the drainage in this area. If you have any questions regarding this matter, I can be reached at 952-447-9832. Sincerely, a.....~ ,?'/'" . " ;:;;> -..".. arry Poppler Assistant City Engineer City of Prior Lake CC: Frank Boyles, City Manager www.cityofpriorlake.com Phone 952.447.9800 / Fax 952.447.4245 . " ~ WSB &: tbsoci<Ius.. l~. Infrastructure _ Engineering - Planning _ Construction 701 Xenia Avenue South Suite 300 Minneapolis, MN 55416 Tel: 763-541-4800 Fax: 763-541-1700 December 9, 2008 Mr. Larry Poppler Assistant City Engineer City of Prior Lake 4646 Dakota Street SE Prior Lake, MN 55372 Re Technical Memorandum for N orthwoods Road Drainage Analysis City of Prior Lake, MN WSB Project No. 1100-56 Dear Mr. Poppler: I. INTRODUCTIONIPURPOSE This document has been prepared to outline the results of a hydrologic analysis that was completed to quantify the change in runoff a volume that would result from the expansion ofa home at 18973 Northwood Road (the Robinson residence), and evaluate the relative impact of this change on a wet basement problem reported to be present for a structure located immediately west of this structure (Dumke residence). This memorandum provides an outline ofthe procedures and methods that were followed in completing this analysis, an overview of the site conditions that were observed during an on-site inspection and review of the hydrologic information that available from City record drawings and other sources, and the findings that were developed as result of this study. II. PROCEDURES AND METHODS FOLLOWED As part of this investigation, a number of activities were undertaken that included the following: . A visual inspection of the general area to determine the pattern and direction of drainage from the buildings, driveways, and yard areas for the three lots in the immediate vicinity of the structure reported to be impacted by off-site drainage. . A review of aerial photos for this site based on historic conditions, conditions present immediately prior to the addition being constructed on Robinson property and conditions currently in-place. ACEC 2008 Firm of the Year Minneapolis _ St. Cloud Equal Opportunity Employer K:\OllOO.S6\Admin\Docs\MEMO-1 poppler-120-l08.doc 4 ... Mr. Larry Poppler, PE December 9, 2008 Page 2 · An inspection of the condition of the various drainage systems serving the properties within the study area. · A hydrologic analysis to evaluate changes in the runoff characteristics that occurred as a result of the addition being constructed on the Robinson property. · The development of findings and recommendations based on the observations and analyses completed, and the application of commonly accepted procedures and practices that are routinely employed as part of land development and site grading activities. III. OVERVIEW OF SITE CONDITIONS Based on topographic mapping information that was available for the study area, a site inspection, information provided by the assistant City Engineer, and building permit information was made available by the city, the following site conditions and background information regarding the area was obtained. · The general drainage pattern for the study area is shown on the attached figures. · The home at 18973 Northwood Road (the Robinson residence) is constructed on a narrow lot (30 feet) and is bordered by the Dalsin residence on the east and the Dumke residence on the west (See attached figure.) · The Dalsin residence is located at the top of a hill. Water then drains water outwardly from the structure. · Observations of the Dumke home indicate that drainage from the east side of the roof is directed to a gutter system that appears to be plugged. This traps water and results in water from the roof overflowing the gutter and then being deposited adjacent to the east side ofthe structure. Furthermore, grades adjacent to the east side of the structure do not allow storm water runoff to drain away from the structure in a positive manner. A similar observation is made for runoff from the north facing building roof. Runoff from the roof will pond on the north side of the garage and potentially contribute to the basement water problem. · Prior to building the addition on the Robinson site, it is estimated that 3,820 square feet of surface area directed runoffto the east side of the Dumke structure. Within this area, 1,250 square feet was associated with roof drainage, and 2,570 square feet was associated with turf areas draining to the west. An analysis ofthis Robinson parcel after the addition was constructed indicates a 3,520 square foot area would contributes drainage to the east side of the Dumke structure, and of this area, 1,635 square feet would be associated with building roof and 1,890 square feet would be associated with turf areas. · The Robinson structure has gutters installed on both the west and east side of the structure. If the gutters and downspouts are functioning, most of the impervious surface area of the roof on their property would be diverted so is to not direct water to the Dumke structure. · It was observed that the Dalsin residence was expanded in 2003 and has roof areas with gutters and downspouts installed that direct runoff from the roof toward the Dumke residence. K:\OIIOO-56\Admin\Docs\MEMO-1 poppler-120-l08.doc Mr. Larry Poppler, PE December 9, 2008 Page 3 IV. ANALYSIS AND FINDINGS · Prior to the construction of the expansion to the Robinson residence, it is estimated that for a 3-inch event, approximately 365 cubic feet of storm water runoff would be generated from the area shown on the figure that could be directed to areas coming in construction with the Dumke structure. Following the construction of the expansion, if gutters were not functioning, this runoff volume would be increased to 435 cubic feet (a net increase of70 cubic feet.) With gutters functioning on the Robinson residence, the volume directed to the Dumke structure is estimated to be 345 cubic feet, a net decrease of 20 cubic feet. · Because the top of a hill is present immediately east of the Dumke residence, compared to many lots, limited off-site drainage is directed toward the Dumke structure. · It is our opinion that the poorly maintained gutter system on the east side of the Dumke roof coupled with a poorly defined drainage swale adjacent to the west side of the structure (that ifproperty functioning could carry both roof drainage and off-site water away from the structure) is creating problems with water in the basement to a greater extent than the recent expansion of the structure on the Robinson site. V. RECOMMENDATIONS In order to better manage stormwater runoff in this area and reduce the probability that water will seep into the Dumke basement, it is recommended that the following be undertaken: 1. The Dumke's should maintain the gutter system on the their property so it will function as intended, and undertaken grading and drainage improvements adjacent to the west and north side of their home in such a manor to allow water to flow away from the structure either to the south to the lake or north down the driveway. 2. The Robinson's should improve the drainageway on the west and east side of their home to facilitate conveyance of water from the roof of their structure to the north to the extent necessary to assure it will not flow toward the Dumke structure. Currently, gutters and other facilities are in place to generally allow this to occur; however, should the gutter system become obstructed, additional water could be conveyed to the Dumke residence that may further exacerbate this problem. It is anticipated that limited site modifications for the Robinson parcel would be required to achieve these goals. 3. The Dalsin's should modify their downspout system to convey roof drainage from their structure to the south to a point on their lot were roof drainage could be conveyed down the slope to the lake. Currently, roof drainage from the gutter system outfalls at a location that will allow it to cross the Robinson parcel and impact the Dumke structure with additional drainage. K:\OlIOO-56\Admin\Docs\IvJEMO-I poppter-120-l0S.doc Mr. Larry Poppler, PE December 9,2008 Page 4 Please note, it is not the intention of this document to infer that any of the referenced individual property owners have a legal obligation to undertake the improvements recommended. However, the implementation of the recommended improvements has the potential to improve or correct the problem the Dumke's are experiencing. Furthermore, should the two upstream property owners undertake the improvements recommended, it is our opinion that they would mitigate any potential drainage impact that expanded development on their property could have on the Dumke Structure. Sincerely, WSB & Associates, Inc. ~\).VJ'~~ Pete Willenbring, PE . { Vice President tsf K:\O llOO-56\Admin\Docs\MEMO-1 poppler-120.J08.doc ~ ~ ~ c.: c.: <:: ~. -~ ~ 1 CD (") r-+ -0 -- ::J O(Q '-- CD ~ UO) r-+ ~CD ~ 1 Or-+ 00 I <J10 me :3 ~ CD ;0 CD en 0- CD ::J () CD OJ CD cY l CD )> 0.. 0.. ~ o ~ U1 )> -0 -0 l o >< :3 0) r-+ CD (j) C 0- ~ Q) r-+ CD 1 (j) :::r CD 0.. OJ o C ::J 0- 0) 1 '< o z o ;:+ ::T =E o o c. en ;;a o Q) C- O .., Q) -. ~ Q) c.c CD )> ~ Q) - '< en -- en o ::J () o ::::J en r-+ 1 C (') r-+ CD 0.. w o >z m -nO CD (I) ,.....-t- >z ~ ~ 1 CD -Un. 1 -- o ::J '-- - (Q CD () r-t- ~ ID ~ r-t- ~~ o r-t- I 0 ~O c 3 7' CD ;0 CD en -- 0. CD ::J C1 CD )> ;::P CD 1 o ~ CJ1 )> -0 -0 1 o >< 3 Q) r-t- CD C/) C 0- ~ Q) r-t- CD 1 (J) :::J CD 0.. OJ o C ::J 0. tu 1 ~ o z o ~ :T ~ o o C. tn ::;tJ o tu )> 0. 0. ;::+ o ::J () o :J (J) r-t- 1 C () r-t- CD 0. ~0'/1./2009 10:18 PAX III 001 April 13, 2009 Steve Millar 485 I Rutledge St SE Prior Lake, MN 55372 Dear Councilman Millar: I am contacting you in regard to the increased drainage onto my property at 16037 Northwood Road NW from the Jerod Robinson property adjacent to mine. As you remember, you granted Mr. Robinson II variances against my property so that he could triple the size of his house on the narrowest lot in the City of Prior Lake. Even though you thought Mr. Robinson should be able to do this, you did put a caveat on his expansion. After you saw my report from Hedlund Engineering, you agreed that Mr. Robinson should be required to take care of his own drainage on his property. You then mandated that the city would have an outside hydro engineering finn establish a drainage plan, probably including a drainage swale to the lake as Hedlund Engineering had offered as a solution. When I called the city engineer about this, Mr. Poppler told me Mr. Robinson was not required to do what the City Council had mandated because he eyeballed it and it looked like most of Mr. Robinson's water would cross my property and go to the street. Now because the city engineers did not require Mr. Robinson to have an outside registered hydro engineering plan, my foundation being undermined, and my basement tloor is buckling and I am actually getting water inside my home for the first time in the 18 years of my homes existence. The diversion of Mr. Robinson~s water from his new addition onto my property and into my home is causing interior damage and mold. This mold is sickening my family. We believe my five year old daughter) Hannah, has been having some respiratory problems from the mold. This situation has become intolerable and not only is my property being destroyed. my home is becoming uninhabitable. If my property and home has to be used as a drain field for the Robinson new addition, I will need the city help me relocate for the health of my family. I am enclosing pictures and information further explaining the dire situation the City Engineers have placed my fanlily in by not requiring Mr. Robinson to deal with his own water as promised by the City. Council. pt. v t.L- .n u m )( e.. 1t:;- , -50t ~ 3Lt5 ...., ~~5, FOAl Lj ~..)- .... 4 J. '-) 5 A WSB & Asso<:iales. Inc. Infrastructure _ Engineering _ Planning _ Construction 701 Xenia Avenue South Suite 300 Minneapolis, MN 55416 Tel: 763-541-4800 Fax: 763-541-1700 December 9,2008 Mr. Larry Poppler Assistant City Engineer City of Prior Lake 4646 Dakota Street SE Prior Lake, MN 55372 Re Technical Memorandum for Northwoods Road Drainage Analysis City of Prior Lake, MN WSB Project No. 1100-56 Dear Mr. Poppler: I. INTRODUCTIONIPURPOSE This document has been prepared to outline the results of a hydrologic analysis that was completed to quantify the change in runoff a volume that would result from the expansion of a home at 18973 Northwood Road (the Robinson residence), and evaluate the relative impact of this change on a wet basement problem reported to be present for a structure located immediately west of this structure (Dumke residence). This memorandum provides an outline of the procedures and methods that were followed in completing this analysis, an overview of the site conditions that were observed during an on-site inspection and review of the hydrologic information that available from City record drawings and other sources, and the findings that were developed as result of this study. II. PROCEDURES AND METHODS FOLLOWED As part of this investigation, a number of activities were undertaken that included the following: . A visual inspection of the general area to determine the pattern and direction of drainage from the buildings, driveways, and yard areas for the three lots in the immediate vicinity of the structure reported to be impacted by off-site drainage. . A review of aerial photos for this site based on historic conditions, conditions present immediately prior to the addition being constructed on Robinson property and conditions currently in-place. ACEC 2008 Firm of the Year Minneapolis _ St. Cloud Equal Opportunity Employer K:\01100-56\Admin\Docs\MEMO-l poppler-120408.doc Mr. Larry Poppler, PE December 9, 2008 Page 2 . An inspection of the condition of the various drainage systems serving the properties within the study area. . A hydrologic analysis to evaluate changes in the runoff characteristics that occurred as a result of the addition being constructed on the Robinson property. . The development of findings and recommendations based on the observations and analyses completed, and the application of commonly accepted procedures and practices that are routinely employed as part of land development and site grading activities. III. OVERVIEW OF SITE CONDITIONS Based on topographic mapping information that was available for the study area, a site inspection, information provided by the assistant City Engineer, and building permit information was made available by the city, the following site conditions and background information regarding the area was obtained. . The general drainage pattern for the study area is shown on the attached figures. . The home at 18973 Northwood Road (the Robinson residence) is constructed on a narrow lot (30 feet) and is bordered by the Dalsin residence on the east and the Dumke residence on the west (See attached figure.) . The Dalsin residence is located at the top of a hill. Water then drains water outwardly from the structure. . Observations of the Dumke home indicate that drainage from the east side of the roof is directed to a gutter system that appears to be plugged. This traps water and results in water from the roof overflowing the gutter and then being deposited adjacent to the east side of the structure. Furthermore, grades adjacent to the east side of the structure do not allow storm water runoff to drain away from the structure in a positive manner. A similar observation is made for runoff from the north facing building roof. Runoff from the roof will pond on the north side of the garage and potentially contribute to the basement water problem. . Prior to building the addition on the Robinson site, it is estimated that 3,820 square feet of surface area directed runoff to the east side of the Dumke structure. Within this area, 1,250 square feet was associated with roof drainage, and 2,570 square feet was associated with turf areas draining to the west. An analysis of this Robinson parcel after the addition was constructed indicates a 3,520 square foot area would contributes drainage to the east side of the Dumke structure, and of this area, 1,635 square feet would be associated with building roof and 1,890 square feet would be associated with turf areas. . The Robinson structure has gutters installed on both the west and east side of the structure. If the gutters and downspouts are functioning, most of the impervious surface area of the roof on their property would be diverted so is to not direct water to the Dumke structure. . It was observed that the Dalsin residence was expanded in 2003 and has roof areas with gutters and downspouts installed that direct runoff from the roof toward the Dumke residence. K:\OIIOO-56\Admin\Docs\MEMO-l poppler.120408.doc Mr. Larry Poppler, PE December 9, 2008 Page 3 IV. ANALYSIS AND FINDINGS . Prior to the construction ofthe expansion to the Robinson residence, it is estimated that for a 3-inch event, approximately 365 cubic feet of storm water runoff would be generated from the area shown on the figure that could be directed to areas coming in construction with the Dumke structure. Following the construction of the expansion, if gutters were not functioning, this runoff volume would be increased to 435 cubic feet (a net increase of70 cubic feet.) With gutters functioning on the Robinson residence, the volume directed to the Dumke structure is estimated to be 345 cubic feet, a net decrease of 20 cubic feet. . Because the top of a hill is present immediately east of the Dumke residence, compared to many lots, limited off-site drainage is directed toward the Dumke structure. . It is our opinion that the poorly maintained gutter system on the east side of the Dumke roof coupled with a poorly defined drainage swale adjacent to the west side of the structure (that if property functioning could carry both roof drainage and off-site water away from the structure) is creating problems with water in the basement to a greater extent than the recent expansion of the structure on the Robinson site. V. RECOMMENDATIONS In order to better manage stormwater runoff in this area and reduce the probability that water will seep into the Dumke basement, it is recommended that the following be undertaken: 1. The Dumke's should maintain the gutter system on the their property so it will function as intended, and undertaken grading and drainage improvements adjacent to the west and north side of their home in such a manor to allow water to flow away from the structure either to the south to the lake or north down the driveway. 2. The Robinson's should improve the drainageway on the west and east side of their home to facilitate conveyance of water from the roof of their structure to the north to the extent necessary to assure it will not flow toward the Dumke structure. Currently, gutters and other facilities are in place to generally allow this to occur; however, should the gutter system become obstructed, additional water could be conveyed to the Dumke residence that may further exacerbate this problem. It is anticipated that limited site modifications for the Robinson parcel would be required to achieve these goals. 3. The Dalsin's should modify their downspout system to convey roof drainage from their structure to the south to a point on their lot were roof drainage could be conveyed down the slope to the lake. Currently, roof drainage from the gutter system outfalls at a location that will allow it to cross the Robinson parcel and impact the Dumke structure with additional drainage. K:\OllOO-56\Admin\Docs\MEMO-1 poppler-120408.doc Mr. Larry Poppler, PE December 9, 2008 Page 4 Please note, it is not the intention of this document to infer that any of the referenced individual property owners have a legal obligation to undertake the improvements recommended. However, the implementation of the recommended improvements has the potential to improve or correct the problem the Dumke's are experiencing. Furthermore, should the two upstream property owners undertake the improvements recommended, it is our opinion that they would mitigate any potential drainage impact that expanded development on their property could have on the Dumke Structure. Sincerely, WSB & Associates, Inc. ~ \). W'~~ Pete Willenbring, PE - l Vice President tsf K:\OllOO-56\Admin\Docs\MEMO-I poppler-120408.doc 4646 Dakota Street S.E. Prior Lake, MN 55372-1714 ,.'" . '~, : April 29, 2009 DR. BRUCE DUMKE 16037 NORTHWOOD ROAD PRIOR LAKE, MN 55372 RE: DRAINAGE AT 16037 NORTHWOOD ROAD Dear Dr. Dumke, Thank you for meeting me last Friday, April 24th. During our visit, we reviewed the damage inside your home at the northwest corner of your lower level. We also reviewed the perimeter of the home's exterior. Based on the visit, it was not obvious how water is entering your lower level. As indicated to you previously, the Robinson drainage does not flow toward the home at that location. The Robinson gutters are directed to flow toward Northwood Road. At that location your gutter system should collect the water from your rooftop and divert it away from the home, if properly maintained. The water spigot at that location did not show signs of malfunction. We did not discuss whether or not you currently have a sump pump for the home. Another potential issue could be the boulder walls located at the northwest corner of your home. Boulder walls are typically constructed with clean aggregate behind and underneath the wall. Over time, boulder walls can shift. If any of the boulders shifted enough to create a void behind the wall, water could use the clean aggregate as a conduit to get to the basement wall at this location. As discussed, I recommend that you seek advice from a hired professional before any further damage is done to your home. www.cityofpriorlake.com Phone 952.447.9800 / Fax 952.447.4245 Thank you again for meeting with me. If you have any questions or if I can be of any further assistance to you, I can be reached at 952-447-9832. Sincerely, ~~2 f<- / ~ -----.. Larry Poppler Assistant City Engineer City of Prior Lake cc: Frank Boyles, City Manager