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Home My WebLink AboutJuly 8, 1998 Work SessionCI'T¥ OF COLUMBIA HEIGHTS (1'") 590 40TH AVENUE N.B., COLUMBIA HEIGHTS, MN 55421-3878 (612) 782-2800 TDD 782-2806 ADMINISTRATION i],layor Joseph Sturdevant Councilmembers Donald G. Jolly Gary L. Peterson Robert W.. Ruertimann 3Xartaine Szureh CiO' Manager ~alter R. Fehat NOTICE OF OFFICIAL MEETING Notice is hereby given that an official meeting is to be held in the CITY OF COLUMBIA HEIGHTS as follows: Meeting of' MAYOR, CITY COUNCIL, AND CITYMANAGER Date of Meeting: WEDNESDAY, JULY& 1998 Time of Meeting: 7:00 P.M. Location of Meeting: CZTY HALL CONFERENCE ROOM Purpose of Meeting: WORK SESSION 4. 5. 6. 7. 8. 9. 10. Replacement of JPM Dishwasher Extending the Term of Office for Mayor from Two Years to Four Years (Charter Commission RequesO Update on Financing for Water/Sewer Improvements (Oral ReporO RFP for Storm Water Utility Bonestroo, Rosene, Anderlik & Associates Storm Water Work Metropolitan Council of Environmental Services Work Report on Proposed Sidewalk Ordinance Moratorium on Construction for Site at St. Timothy's Amendment to Administrative Offense Schedule Condemnation of 1260 46~h Avenue NE and 3900 Central The City q£Columbia Heights does not discriminate on the basis of disability in the admission or access to, or treatment or employment in, its services, programs, or activities. Upon request, accommodation will be provided to allow individuals with disabilities ro parn'cipate in all City of Columbia Heights' services, programs, and activities. Auxiliary aids for handicapped persons are available upon request when the request is made at least 96 hours in advance. Please call the City Council Secretary at 782-2800, Extension 209, To make arrangements. ~DD/782-2806 for deaf only) ADMINISTRATION Mayor Joseffh Sturdevant Councilmembers Donald G. Jolly Gary L. Peterson Robert W.. Ruettimann Marlaine Szurek City Manager Walter ]L Fehst NOTICE OF OFFICIAL MEETING Notice is hereby given that an official meeting is to be held in the CITY OF COLUMBIA HEIGHTS as follows: Meeting of: Date of ]VZeeting: Time of Meeting: MAYOR, CITY COUNCIL, AND CITY MANA GER WEDNESDAY,, JULY 8, 1998 7:00 P.i~Z. Location of Meeting: CITY HALL CONFERENCE ROOM Purpose of Meeting: WORK SESSION .~ Replacement of JPM Dishwasher Extending the Term of Office for Mayor from Two Years to Four Years ('Charter Commission RequesO 3~. Update on Financing for Water/Sewer Improvements (Oral ReporO · Bonestroo, Rosene, Anderlik & Assodlates Storm Water Work ~~ Metropolitan Council of Environmental Service~o_rk r ~_ _~--~- ' Report on Proposed Sidewalk Ordinance ~ : r Moratorium on Construction for Site at St. Timothy's ~ ~ Amendment to Administrative Offense Schedule ·_C/b~~C~- ~ Condemnation of l26046~hAvem,e N~~ The City of Columbia Heights does not discriminate on the basis of disability in the admission or access to, or treatment or employment in, its services, programs, or act~'vities. Upon request, accommodation wilt be provided to allow individuals with disabitities to participate in all Ci{y of Columbia Heights' services, programs, and activities. Auxiliary aids for handicapped persons are available upon request when the request is made at least 96 hours in advance. Please call the City Council Secretary at 782-2800, Extension 209, To make arrangements. (TDD/782-2806 for deaf only) CITY COUNCIL LETTER Meeting of: July 13, I998 AGENDA SECTION: Consent Agenda . . ORIGINATING DEPT.: CITY MANAGER Recreation APPROV AL NOi , ...... , _.. )~ ,,,,////~_._~/~.~/, , , e,,, ITEM: Replacement of Murzyn Hall Dishwasher BY: Keith Windschid BY: ,." ~ .... _. : DATE:,,J,,une 30, 1998 , ~ BACKGROUND: The dishwasher at Murzyn Hall is approximately 25 years old and is in poor condition. The machine has broken down numerous times, and at this time the lower unit is leaking. Stuff ~e unable to get parts to repair it anymore because the machine is obsolete. Considerable overtime wages have been spent on emergency repairs of the dishwasher. ANALYSIS: The Park and Recreation Commission was advised of this problem at their meeting of June 24, 1998. Members discussed the matter and recommended that a new dishwasher be purchasecL Members felt it was not wise to purchase a used dishwasher because of potential problems with a used machine. The Recreation Director advised members that a new dishwasher without a booster heater would cost approximately $7,250. The Park and Recreation Commission discussed the purchase of this dishwasher is an emergency which should be funded (mt of the City antenna fund. RECOMMENDED MOTION: MoVe to authorize staff to seek bids to replace the current Murzyn Hall dishwasher with a new dishwasher at a cost not to exceed $7,250 installed which would be funded out of the city antenna fund. COUNCIL ACTION: ~ZTY CO~RCIL LETTER, Meeting of: July 13, 1998 AGENDA SECTION: --' ORIGINATING DEPARTMENT: CITY MANAGER'S NO: CITY MANAGER'S APPROVAL ITEM: WORDING FOR NOVEMBER, 1998, GENEP. AL BY: CHARTER COMMISSION BY: ELECTION B~IJ,OT REGARDING THE DATE: 6-30-98 DATE: POSSIBILITY OF EXTENDINS THE TERM OF OFFICE FOR MAYOR FROM TWO YEARS TO FOUR YEARS Last y~ar, the Charter Commission reviewed the entire City Charter chapter by chapter and also discussed suggestions for any other charter changes. One issue that was decided to be further discussed was extending the terms of office for Mayor from two years to four years. This is found in Chapter 2, SeCtion 7 of the City Charter. The Charter Commission discussed this item at various meetings over the past year. On April 16, !998, the Charter Commission held its first reading of a charter change extending the terms of office for Mayor from two years to four years. On May 21, 1998, the CommissiOn held its second reading of the proposed ordinance. The reading was approved with a 8-1 vote. The Charter Commission recommends this subject, in accordance with State Statutes Chapter 410.12, Subdivision 4, be placed on the ballot on the Novenfoer 1998 General Election. It is understood that if this charter change passes, it would take effect in January, 2000. Jim Moeft, City Attorney, has been asked to provide language for the ballot question. He proposes the following language: SHALL THE COLUMBIA HEIGHTS CITY CF_a_RTER BE A/~ENDED TO CHANGE THE MAYORAL TERM FROM TWO (2) YEARS TO FOUR (4) YEARS? RECOMMENDED MOTION: Move to approve the recommended language of the City Attorney (as stated above) regarding changing the Mayor's term of office, and to direct the CiTy Clerk to place this language on the next general election ballot. COUNCIL ACTION: City of Columbia Heights Water System Improvements Approximate 10 Year Bonding Costs Net Interest Cost 4.61% Scheduled Improvements for 1998-2000 Customer costs 10 Year Bond Interest Total cost Annual cost Customers Annual cost per customer Quarterly Cost Monthly Cost Rate increase need to pay Bond Per 100 cuft 394,320 146,751 541,071 54,107 6,000 9.02 2.25 0.75 0.07 Note: Approximate costs and projections for discussion purposes only City of Columbia Heights Radio Read Water Meters Approximate 10 Year Bonding Costs Net Interest Cost 4.61% Customer paying the full cost Customer paying one half the cost 10 Year Bond Interest Total cost Annual cost Customers Annual cost per customer Quarterly Cost Monthly Cost 1,200,000 600,000 446,594 223,297 1,646,594 823,297 164,659 82,330 6,000 6,000 27.44 13.72 6.86 3.43 2.29 1.'14 Note: Approximate costs and projections for discussion purposes only Ci_ty of Columbia Heights Public Works Department Work Session Discussion Item Work session date: July 8,1998 ,mci Prepared by: Kevin Hansen, Public Works Director/City Engi Item: RFP for Storm Water Utility Background: The City has employed the services of a consulting engineer to evaluate particular areas for surface water runoff and the existing storm sewer system's ability to handle them. Several improvements are recommended throughout the City to address/improve existing flooding conveyance problems. Financing the recommended improvements has been discussed and consists of bonding, grant monies and establishing a storm water utility. Grant funding has been applied for through the Minnesota DNR and we should know the results within 4-6 weeks. Analysis/Conclusions: A storm water utility is a method of financing the administration, planning, implementation, and maintenance of surface water programs. The utility can include capital improvements, street sweeping, leaf pickup, lake management, drainage system rehabilitation, and wetland protection. The utility is funded by a service charge or utility fee. A utility fee is typically charged against all developed parcels within a city. The fee is based on how much water runoff and/or pollutant load is contributed by a particular parcel. Where land is in a natural state, most rain soaks into the ground or is retained in small depressions. Where development has been prevalent, rooftops, driveways and parking lots prevent rainfall from soaking into the ground. The rain runs off into streets, ditches, ponds and lakes, creating the need to address the quantity and protect the quality of our water resources. The cost of operating and maintaining surface water facilities is keeping pace with other increasing municipal costs. A utility provides the means to handle the increasing costs through moderate adjustments in the utility charges. This consistent, dependable revenue source provides a dedicated fund to manage the drainage system and capital improvements without increasing property taxes or using assessments. Requested Action: Authorize staff to seek request for proposals for consultant services for the establishment of a storm water utility for the City of Columbia Heights. Ci_ty of Columbia Heights Public Works Department Work Session Discussion Item Work session date: July 8,1998 ~ Prepared by: Kevin Hansen, Public Works Director/City Eng,/ Item: BRA Storm Water Study Background: Attached are final Engineering Reports with recommendations from the City's consultant, BRA, for the stormwater study areas. The reports have been reviewed and revised based upon staff and Council comments and input. Analysis/Conclusions: The recommendations and estimated cost for each study area can be summarized as follows: Corporate Limit Area a. Do nothing at this time (Based upon Fridley maintenance adjustments for pipe overflow relief) b. Future: In the event flooding reoccurs to these homes, it is the study recommendation to flood-proof the homes McKinley St. and 40th Ave. N.E. Ponding in Prestemon Park $0 $ Potential future cost. $131,500 o Monroe Street N.E. and 49 ½ Ave. N.E. 1998: Catch basin/road improvements 2000: Trunk storm sewer (conjunction with Zone 4 Street Program) $18,000 $282,500 Jackson Pond 2. 3. 4. 5. Jackson Pond 4500 block of Washington St. 4300 block of Washington St. 1307 42nd Ave. N.E. Tyler Place N.E. and 44th Ave. N.E. $15,500 $115,500 $100,000 $115,500 $ 57,000 Sub-Total: $835,500 Work Session: July 8, 1998 BRA Storm Water Study Page 2 Other, smaller or localized problems that did not have engineering reports for are estimated as follows: 1. 4116 Cleveland $ 21,000 2. 1156 to 1206 Khyber Lane $ 31,000 3. 4201 2nd St. N.E. $ 5,500 4. Main Street & 2nd Street (38th to 39th) $ 4,500 5. 550 46th Ave. N.E. (Alley between 5th and 6th) - 6. 4960 Fillmore St. $ 5,000 Sub-Total $ 67,000 Total Estimated Cost $902,500 Grant funding through the Minnesota DNR has been applied for. Requested Action: Accept Engineering Study Reports and authorize the design of the storm sewer improvements as recommended and begin negotiations for property acquisition as identified. ' Bonestroo Rosene Anderlik & Associates Engineers & Architects Bonestroo, Rosene, Anderlik and Az$ociates, /nc,/5 an Affirmative Action/Equal Opporcun(cy Emptoyer Principals; Otto G, Bonestroo, RE, · Joseph C, Anderl~k, P.E. · Marvin L, Sorvala, P.E. · Richard E, Turner, RE. · Glenn R. Cook, RE. Robert ~. Rosene, RE. and Susan M. Eberlin, C.RA., Senior Consultants A~ociate Principal~: Howard Richard ~ Foster, Michael T Rautmann, Sidney R Williamson. Allan Rick Schmidt, OfRce~: St~ Paul Rochester, Willmar and St, Cloud, MN FEASIBILITY STUDY FOR STORMWATER IMPROVEMENTS CORPORATE LIMIT AREA COLUMBIA HEIGHTS, MINNESOTA BRAA FILE NO. 33210 This report presents the results of our stormwater improvements feasibility study for the Corporate Limit area. The Corporate Limit flooding occurred in July of 1997 along the Fridley/Cotumbia Heights border south of 52nd Avenue. We have completed our analysis of this area according to the plan detailed in our scoping study addendum of 12/18/97. This report begins with an introduction to the problem area followed in sequence by the following sections: Analysis and Results, Alternatives, Cost Estimates, and the Recommended Alternative. A location map and report figure are at the end of this report. Please note that elevations are in the city of Minneapolis datum followed in parenthesis by the USGS datum. The USGS datum is obtained from the Minneapolis datum by adding 710.3 feet. ~ 1. INTRODUCTION A chronic backyard flooding problem has .existed at 1280 and 1298 52nd Avenue in the City of Fridley- along Fridley's border with Columbia Heights (see figure 1). These homes suffered flooding as a result of the July 1, 1997 storm. The home at 1280 52nd Avenue also had flooding during the July 11 storm. Recently, the two cities cooperatively placed an additional 36-inch pipe above the existing 36-inch storm sewer in this area. At its upstream end, this newer pipe connects to a 100-foot section of 36-inch corrugated steel slotted drainpipe. The two 36-inch pipes discharge to a single 24-inch pipe (see Figure 2). 2335 West Highway 36. St. Paul. MN 55113 · 612-636-4600 · Fax: 612-636-1311 During the July storms, residents witnessed stormwater discharging at high pressure from the backyard catch basins. This discharge, combined with overflow from two catch basins on Polk Place, caused flooding in these backyards. Since the July storms, the city of Fridley has installed a pressure releasing grate on the manhole 300' west of 1280 52~d Ave. NE. 2. ANALYSIS AND RESULTS We analyzed the pipe network upstream and downstream of the flood prone area. Additionally, we located and characterized sources of overland flow such as the overflow from the catch basins at the intersection of Polk Place and Pierce Terrace. Anecdotal evidence obtained from resident interviews and water staining on the two homes suggest a July 1 high water level (HWL) of 234.1' (944.4'). The tipping bucket rain gauge at the public works facility indicated that the July 1 storm was the most intense of the three July storms, with over 3.64 inches of rain in 3.5 hours and 2.9 inches in the first hour. Our model, developed with the XP-SWMM32 software, simulated the July 1 storm and supports the anecdotal evidence obtained from residents at 1280 and 1298 52nd Avenue. As mentioned above, water staining suggests a HWL of approximately 234.1' (944.4') for the July I storm. The two homes are both walkouts. The Iow openings for 1280 and 1298 52~d Avenue are 233.4' (943.7') and 233.9' (944.2'), respectively. Our model calculated a July 1 HWL of 233.9 (944.2'), which calibrates well with the observed HWL. 3. ALTERNATIVES Various alternatives were considered to address the flooding problem. Of these, four were studied in detail and are presented in this report. 3.1 Alternative 1: Acquisition and Flood Proofing of 1280 and 1298 52nd Avenue NE Alternative 1 involves acquisition of both homes, flood proofing by converting these homes from walkout to lookout basements, and subsequent resale of the homes. This alternative involves filling around the current walkouts and restoration of the backyards. 3,2 Alternative 2: Berming in the Vicinity of 1280 and 1298 52nd Avenue NE. Alternative 2 involves constructing a berm to protect the homes at 1280 and 1298 52nd Avenue NE (see Figure 2). For this alternative, excavation and embankment should balance. If berm construction results in a net loss of storage, then the HWL for a given storm will rise. The berm top should rise to 234.9' (945.2'), which is approximately 1 foot above the calculated 100-year, 24-hour storm and July 1 HWLs. Since storage below 233.9' (944.2') must remain the same, some excavation will occur across the corporate boundary into Columbia Heights where several trees from 8 to 24 inches in diameter now grow. These would likely have to be removed. Additionally, the berm will tie in to high ground one lot to the east and west of 1280 and 1298 52nd Avenue NE, necessitating disturbance of property that has not experienced flooding. Drainage of areas isolated behind the berms would require sump pumps. 3.3 Alternative 3: Emergency overflow grading This alternative consists of grading an emergency overflow (EOF) below the current overflow elevation of 234.7' (945.0') so that 100-year protection is afforded the homes at 1280 and 1298 52nd Avenue NE. Overflow would flow down the current drainage easement to the Iow area off Polk Circle. From this low area, the flow enters the 36-inch trunk via two ditch type catch basins. This alternative includes clearing and grubbing within the existing city drainage easement so that disruptions to this flow are minimized. In addition to clearing and grubbing, landscape features, sheds, and woodpiles would also require removal. We recommend an EOF elevation of 232.4' (942.7'). Table 1 summarizes the effect this grading will have on the area around 1280 and 1298 52nd Avenue and as well as the low area off Polk Circle. There are several potentially adverse impacts to this alternative. There wilt be no defined flow path, so runoff may flow through or pond in backyards. There is a significant potential for erosion. Runoff may begin to cut a ravine, which could continue to erode and grow over time. This would cause sediment build-up in the downstream Iow area and potential clogging of the catch basins there. Table 1 High Water Levels, Alternative 3 Polk Circle 1280 & 1298 52nd Low HWL. Freeboard Low HWL Freeboard Storm house House (city (city (city (city datum) datum) (f-t) datum) datum) (ft) Before EOF July 1 207.3 1.4 233.9 -0.5 grading 208.7 233.4 After July 1 207.7 1.0 233.3 0.1 EOF grading 100-year 206.6 2.1 233.2 0.2 For the 100-year event, we calculate a peak flow of 27 cfs over the EOF and mean channel velocity of 6 feet per second (fps) to the downstream ponding area off Polk Circle. 3.4 Alternative 4: Overflow with standard pipe installation This alternative consists of approximately 600 feet of 18-inch reinforced Concrete pipe (RCP), installed by open cut trenching to the pondin9 area east of Polk Circle (see Figure 2). This pipe would be laid adjacent to the existing pipe and would discharge directly to the ponding area. This ponded stormwater would enter the trunk system through the beehive catch basins located at this Iow point. The existing overflow elevation would be lowered from 234.7' (945.0') to 232.4' (942.7'). This overflow would operate for storms in excess of the 10-year, 24-hour event. Grading would occur in the existing drainageway in conjunction with the pipe installation so that a clearly defined overflow route is created. Numerous trees, fences, sheds, and landscaping make this a politically sensitive alternative and create a large restoration cost. 3.5 Alternative 5: Overflow with directional bore pipe installation This alternative involves directional boring of a 20-inch (outside diameter) high- density polyethylene pipe and is considered if resident resistance precludes open trench installation. As with alternative 4, this construction involves grading of an emergency overflow (EOF) at 232.4' (942.7'). Stormwater would overflow for storms greater than the 10- year event. Unlike alternative 3, no improvement of the drainage path beyond the limits of the EOF grading is proposed, so as to minimize disturbance of the area. This may result in maintenance problems in years when the EOF is topped (see discussion under Alternative 3). These long-term costs were not considered in the cost estimate for this alternative. Alternatives 4 and 5 are identical from a hydraulic perspective. Both require sufficient catch basin capacity near 1280 and 1298 52nd Avenue NE so that 20 cfs passes into the pipe under approximately 1.2 feet of head. We propose 2 catch basins with rim elevations of 942.0'. These should be covered by stool type ditch grates similar to Neenah R-4342. These have a relatively Iow profile, which would be more appropriate for installation in private backyards. Each grate should pass approximately 9 cfs under 1.2 feet of head. in considering alternatives 3, 4 and 5, it should be understood that passing water more quickly out of this area has the potential to flood the downstream ponding area if the catch basins there become clogged with debris. It has been indicated that water came within 5 feet (horizontally) of a home off Polk Circle. The corners of this home lie at approximately 208.7' (919.0') and 5 feet from this would suggest a July 1 HWL of 208.2 (918.5'). Our model predicts a July 1 HWL of 207.1' (917.4)' for this area and, after alternatives 4 and 5 described above, a July 1 HWL of 207.5 (9t7.8'). This discrepancy suggests that the catch basins did not drain the ponding area to their full capacity and that they might have been clogged. Table 2 summarizes the effects of the improvements proposed under Alternatives 4 and 5. Table 3 shows the effect these have on the downstream ponding area. The results are'derived from the XP-SWMM32 model of the area. Table 2 Flows and High Water Levels, Alternatives 4 and 5 HWL Freeboard Flow in I Overflow Storm proposed pipeI Overflow Elevation (city datum) (ft) (cfs) I (cfs) (city datum) Before Improvements July 1 233.9 -0.5 NA NA 234.7 July 1 232.9 0.5 22 21 100-yr 232.9 0.6 20 18 (6.0") 50-yr I After (5.3") 232.7 0.7 18 9 232.4 Improvements 25-yr 232.6 0.8 15 3.5 (4.7") 10-yr [ (4.1") 232.4 1.0 10 0 Table 3 High Water Levels in Downstream Ponding Area Alternatives 4 and 5 HWL Low House Freeboard Storm . (city datum) (city datum) (ft) Before Improvements July 1 207.3 1.4 After 208.7 Improvements July 1 207.5 1.2 4. COST ESTIMATES Cost estimates are provided for all five alternatives. 4.1 Alternative 1 Cost Estimate Table 4 presents the cost estimate for alternative 1, acquisition and flood proofing of 1280 and 1298 52nd Avenue NE. Table 4 Estimated Cost: Alternative 1 Item Unit Quantity Unit Cost Price Acq. 1280 52nd Ave. NE Acq. 1298 52nd Ave NE Conversion to lookouts Common Borrow Sod LS 1 $122,000 $122,000 LS 1 129,000 129,000 EA 2 2,500 5,000 TN 1200 5.00 6,000 SY 600 5.00 3,000 Estimated Construction Cost 5% Contingencies Design, Inspection, Admin. 5% Capitalized Interest TOTAL ESTIMATED COST 265,000 13,250 278,250 5,000 283,250 14,163 297,413 We estimate that the city could recover approximately $230,000 of this alternative's cost by resale of the two homes. This subsequent resale leads to an alternative 1 net cost of $67,413. 4.2 Alternative 2 Cost Estimate Table 5 presents the cost estimate for'Alternative 2, berming in the vicinity of 1280 and 1298 52nd Avenue NE. Table 5 Estimated Cost: Alternative 2 Item Unit Quantity Unit Cost Price Mobilization Clearing and grubbing Excavation and embankment LS I $6OO $600 LS 1 2,000 2,000 CY 150 10.00 1,500 Sod Trees Sump pumps, PVC piping SY 650 5.00 3,250 EA 15 200 3,000 EA 2 500 1,000 Estimated Construction Cost 5% Contingencies 20% Design, Inspection, Admin. 5% Capitalized Interest TOTAL ESTIMATED COST $11,350 567 $tl,917 2,383 $14,300 715 $15,015 4.3 Alternative 3 Cost Estimate Table 6 presents the cost estimate for alternative 3, emergency overflow grading. Table 6 Estimated Cost: Alternative 3 Item Unit Quantity Unit Cost Price Mobilization LS 1 $600 $600 Clearing and grubbing LS t 4,000 4,000 Excavation and embankment CY 270 10.00 2,700 Sod SY 800 5.00 4,000 Trees EA 6 200 1,200 4.4 Alternative 4 Cost Estimate Estimated Construction Cost 5% Contingencies 20% Design, Inspection, Admin. 5% Capitalized Interest TOTAL ESTIMATED COST $12,500 625 $13,125 2,625 $15,750 787 $16,537 Table 7 presents the cost estimate for Alternative 4, overflow with standard pipe installation. Easement acquisition costs are approximate. Table 7 Estimated Cost: Alternative 4 Item Unit Quantity Unit Price Cost Mobilization 18-inch RCP, some overdepth LS 1 $5,000 LF 660 30.00 $5,000 19,800 18-inch FES Clearing and grubbing Common excavation, channel shaping Sod Trees CB-MH 2'x3' 4' Diameter MH Easement acquisition, temporary EA 1 1,000 1 LS 1 5,0OO 5 CY 520 7.00 3 SY 4200 3.00 12 EA 45 200 9 EA 2 1,000 2 EA 1 1250 1 AC 0.5 20,000 10 000 000 640 600 000 000 250 000 Estimated Construction Cost 5% Contingencies 20% Design, Inspection, Admin. 5% Capitalized Interest TOTAL ESTIMATED COST $69,290 3,465 $72,755 14,551 $87,3O6 4,365 $91,671 Item 4.5 Alternative 5 Cost Estimate Table 8 presents the cost estimate for alternative 5, overflow with directional bore pipe installation. Easement acquisition costs are approximate. Table 8 Estimated Cost: Alternative 4 Unit Quantity Unit Price Cost Mobilization LS 1 $6,000 20-inch OD HDPE, some overdepth LF 630 140 18-inch RCP LF 30 30 Clearing and grubbing LS 1 2,500 Common excavation, EOF shaping CY 140 7.00 Sod SY 1400 3.00 Trees EA 15 200 CB-MH 2'x3' EA 3 1,000 Easement acquisition, temporary AC 0.5 20,000 Estimated Construction Cost 5% Contingencies 20% Design, Inspection, Admin. 5% Capitalized Interest TOTAL ESTIMATED COST $6,000 88,200 9OO 2,500 98O 4 200 3 000 3 000 10 000 $118.780 5 939 $124 719 24 944 $149,663 7,483 $157,146 RECOMMENDED ALTERNATIVE We recommend alternative 1. This approach provides sufficient freeboard and costs significantly tess than the alternatives 4 and 5. In addition, it has the advantage of not passing additional flow to the downstream ponding area. These additional flows combined with the potential for channel erosion argue against alternative 3. Although the model shows adequate freeboard for the home adjacent to the downstream ponding area (even after alternative 3, 4 and 5 improvements), and shows a delayed peak from the overflow down to this area, anecdotal evidence suggests that water levels were higher than those calculated by the model. This may be due to catch basin clogging, but is of enough concern to warrant caution. Although alternative 3 has a relatively low cost, we do not recommend it due to the potential for significant erosion. Further study of the flow path downstream of the emergency overflow is required, and a swale or channel design likely would be warranted. This drainage work would add to the cost and disruption associated with this alternative. The purchase of 1280 and 1298 52nd Avenue NE depends upon the current owners' willingness to sell. 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":~ . :i;~2 z: ~" It. ', t ........ '.": ~. ' ' ..~-,~-.~ ---~J'J$~ ...... O bJ J O >.- n O I.-. O ~ ~ rY I° O- LLI Z W 'IS ~-~ 7 -Z ~v vbj 0 m ~ oO ~ 0 0 c" 0~ 0 0 ~ Bonestroo Rosene Anderlik & Associates Engineers & Architects Bonestroo, l?osene, Anderfik and Associates, lng. is an Affirmative Act/or~/Equai Opportunity Employer Print)pals: Otto R}chard E. Turner, Robert ~, Rosene, RE, and Susan M, Ebedin, C.RA,, Senior Consultants ~ocJate Principals' Howard Richard W. Poster, RE. · David O, Loskota, RE. · Robert C, Russek, A.I.A. · Mark A. Hanson, RE, · M~chael ~ Rautmann, RE. · Ted K~FJe]d, RE. · Kenneth R Anderson, RE. · Mark R. Rolls, RE. · Sidney R Williamson, RE., L.S. · Robert ~ Kotsm~ · Agnes M. Ring · M}chael R Rau, RE. · Allan Rick Schmidt, Office~: St. Paul, Rochester, Willmar and St. Cloud, MN · Milwaukee, WI ~eb~/te: www. bonestroo.com FEASIBILITY STUDY FOR STORMWATER IMPROVEMENTS MCKINLEY STREET NE AND 40TM AVENUE NE COLUMBIA HEIGHTS, MINNESOTA BRAA FILE NO. 33208 This report presents the results of our stormwater improvements feasibility study for the McKinley Street NE and 40th Avenue NE area. Damaging floods occurred here on July 1, 11, and 13 of 1997, though resident surveys indicate that intersection flooding is a regular occurrence. We have completed our analysis of this area according to the plan detailed in our scoping study of 1 t/25/97. This report begins with an introduction to the problem area, followed in sequence by the following sections: Analysis and Results, Alternatives, Cost Estimates, and the Recommended Alternative. A location-map and report figures are at the end of the report. Please note that elevations are in the city of Minneapolis datum, followed in parenthesis by the USGS datum. The USGS datum is obtained from the Minneapolis datum by adding 710.3 feet. i. INTRODUCTION As stated above, flooding occurred here fOr all three of the large July 1997 storms. Several homes on 40th Avenue NE, north of the intersection with McKinley Street NE, were flooded by stormwater that rose up to 2.5 feet above the street catch basins (see Figure 1). Our discussions with residents and City staff indicate that flooding is a chronic problem here, even for events smaller than those encountered in July of 1997. 2. ANALYSIS AND RESULTS We analyzed the pipe network upstream and downstream of the flood prone area (see Figure 2). Runoff from a large area, including Hart Lake and portions of Minneapolis and St. Anthony, converges at this intersection via the storm sewer network. We 2335 ~C/est Highway 36 · St. Paul. MN 55113 · 612-636-4600 · Fax: 612-636-1311 delineated these inputs and entered them into our computer model. Additionally, we located and characterized sources of overland flow such as overflow from catch basins on McKinley, Cleveland, and 39th1/2. The tipping bucket rain gauge at the public works facility indicated that the July 1 storm was the most intense of the three July storms, with over 3.64 inches of rain in 3.5 hours and 2.9 inches in the first hour. Our model, developed with the XP-SWMM32 software, simulated the July 1 storm and supports the anecdotal evidence obtained from several residents living adjacent to this intersection. The topographic survey of this area conducted by City staff, when compared to this anecdotal evidence, indicates that the high water level (HWL) for July 1 was approximately 237.7' (948.0)'. Our model calculates a July 1 HWL of 237.6' (947.9') and thus shows reasonable calibration to the actual storm event. Our model indicates that pipe surcharge (the buildup of stormwater in the pipe network such that additional stormwater is held back) cannot by itself account for the water levels seen at this intersection, and that local overland flow produces the bulk of the flooding. This overland flow travels down both 39th1/2 and McKinley to the intersection of 40th and McKinley, where it ponds until the already full pipe network can accommodate it. 3. ALTERNATIVES Various alternatives to address the flooding problem were considered. Our analysis showed that storm sewer construction to reroute Minneapolis and St. Anthony flow down Stinson Boulevard to Silver Lake does not significantly lower the HWL at McKinley and 40th. We did find that a trunk size pipe from McKinley and 40th to Silver Lake would be effective. This line could run from the intersection due north through backyards or, alternately, could run east to Stinson Boulevard from where it would travel north to Silver Lake. In either case Minneapolis's and the bulk of St. Anthony's stormwater would continue along their present route. Our model indicates that stormwater ponding would be an equally effective alternative. Specifically, ponding in Prestemon Park could store excess overland flow, slowly discharging this water over the course of several hours. This type of solution does not require a trunk size storm sewer. These two alternatives are addressed in more detail below. 3,1.Alternative 1: Ponding in Prestemon Park This alternative (see Figure 2) involves excavation and embankment to form two detention basins within Prestemon Park. These basins would detain flow from Cleveland, 39th1/2, and McKinley. This alternative requires reconstruction of street grades at the intersections of Cleveland and 40th and Cleveland and 39thl/2, and along McKinley near the park entrance. This reconstruction involves additional catch basins and pipe to convey flow into the detention basins. We propose intersection reconstruction at Cleveland and 40th SO that overland flow from the north and west flows down Cleveland from 40th to 39thl/2 and into proposed detention basin A. Likewise, reconstruction of McKinley routes flow from McKinley to proposed detention basin B. Excavation within the park for detention basin A necessitates removing some relatively large trees. Both detention basins would be dry between storms, and would discharge to the existing storm sewer under the park. Table 1 summarizes the flood benefits of this alternative. Table 1 Storm Summary: Alternative 1, Ponding in Prestemon Park HWL- 40~n Low Free- HWL- HWL- Rainfall & McKinley House board Basin A Basin Storm B (in) (City (City (ft) (City (City datum) datum) datum) datum) Before Improvements July 1 3.64 237.6' 0.1 NA NA July 1 3.64 I 236.0' 1.7 237.8' I 238.3 After 100-year 6.0 236.02' 237.7' 1.7 238.2 238.3 Improvements 50-year 5.3 236.0' 1.7 238.0 238.2 10-year 4.1 235.96' 1.7 237.7 238.2 5-year 3.5 I 235.93' 1.7 I 237.3 i 237.8 3.2. Alternative 2: Trunk Storm Sewer This alternative involves installing a trunk storm sewer from the intersection of McKinley and 40th north to Silver Lake. Figure 2 shows a potential alignment for installation through backyards, as wel~ as an alignment along 40th Avenue NE and Stinson Boulevard. The backyard alternative includes an estimated 750 feet of 42- inch reinforced concrete pipe (RCP), several manholes, easement acquisition, some street reconstruction, and significant restoration. Additionally, there are substantial logistical problems in cutting along lot lines directly north to Silver Lake. Routing east to Stinson Boulevard and then down Stinson to Silver Lake involves more street reconstruction but less restoration and less easement acquisition. Table 2 summarizes the benefits of this alternative (applicable to both alignments) in relation to the 100-year, 24 hour, and July 1, 1997 storms. Table 2 Storm Summary: Alternative 2, Trunk Storm Sewer Storm HWL Low House I' Freeboard (City datum) (City datum) I (ft) Before Improvements July 1 237.6' 0.1 237.7' After July 1 236.1' 1.6 Improvements 100-year 236.0' I 1.7 4. COST ESTIMATES Table 3 presents the cost estimate for Alternative 1 as described above and shown on Figure 2. Table 3 Estimated Cost: Alternative 1, Ponding in Prestemon Park Item Unit Quantity Unit Cost Price Mobilization LS Excavation and embankment, off-site disposal CY 12-inch RCP LF 15-inch RCP LF 18-inch RCP LF 12-inch FES EA 18-inch FES EA 2' x 3' catch basin EA Rip rap CY Clearing and grubbing LS Seeding and mulching, pond areas AC Trees EA Remove and replace concrete curb and gutter LF Full depth pavement reclamation SY Subgrade preparation SY Common excavation CY Select granular borrow TN Aggregate base, class V, in place TN Bituminous base type 31 B TN Bituminous wear type 41 B TN 1 $5,000 1,200 7.00 210 22 60 25 170 30 1 600 2 800 8 1,000 30 40 1 1,000 1 4,000 15 200 1,100 7 2,320 0.75 2,690 0.65 1,500 7 1,775 5 1,180 6.50 192 30 192 32 $5,000 8,400 4,620 1,500 5,100 6OO 1 600 8 000 1 200 1 000 4 000 3 000 7 700 1 740 I 749 10.500 8 875 7 670 5 760 6144 4 Traffic control LS 1 5,000 5,000 Estimated Construction Cost 5% Contingencies 20% Design, Inspection, Admin. 5% Capitalized Interest TOTAL ESTIMATED COST $99,158 4,958 $104,116 20,823 $124,939 6,247 $131,186 Tables 4 and 5 present cost estimates for Alternative 2 (for both the backyard alignment and the 40th and Stinson alignment, respectively) as described above and shown on Figure 2. Table 4 Estimated Cost: Alternative 2, Trunk Storm Sewer- Backyard Alignment Item Unit Quantity Unit Price Cost Mobilization LS 1 $10,000 42-inch RCP LF 750 75 8' diameter manholes EA 4 4,000 42-inch FES EA 1 2,000 Rip rap CY 30 40 Clearing and grubbing LS 1 5,000 Sod SY 4,000 3.00 Trees EA 15 200 Restoration LS 1 20,000 Easement acquisition, permanent AC 0.30 130,000 Easement acquisition, temporary AC 0.75 20,000 Remove & replace concrete curb & gutter LF 450 7.00 Full depth pavement reclamation SY 720 0.75 Subgrade preparation SY 720 0.65 Select granular borrow TN 495 5.00 Aggregate base, class V, in place TN 330 6.50 Bituminous base type 31B TN 60 30 Bituminous wear type 41B TN 60 32 Traffic control LS 1 5,000 $10,000 56,250 16,000 2,000 1.200 5.000 12.000 3000 20000 39 000 15 000 3,150 54O 468 2,475 2,145 1,800 1,920 5,000 Estimated Construction Cost 5% Contingencies 20% Design, Inspection, Admin. 5% Capitalized Interest TOTAL ESTIMATED COST $196,948 9,847 $206,795 41,359 $248,154 12,408 $26O,562 Item Table 5 Estimated Cost: Alternative 2, Trunk Storm Sewer- 40th and Sfinson Alignment Unit Quantity Unit Price Cost Mobilization LS 42-inch RCP LF 8-ft diameter manholes EA CB-MH 2' x 3' EA 42-inch FES EA Rip rap CY Sod SY Easement acquisition, permanent AC Easement acquisition, temporary AC Remove and replace concrete curb and gutter LF Full depth pavement reclamation SY Subgrade preparation SY Select granular borrow TN Aggregate base, class V, in place TN Bituminous base type 31B TN Bituminous wear type 41B TN Traffic control LS 1 $10,000 1,453 75 5 4,000 1 1,000 1 2,000 30 40 2,000 3 0.2 130,000 O.45 20,000 2,100 7 4,000 0.75 4,000 0.65 3,100 5 2,100 6.5 330 30 330 32 1 5,000 $10 108 20 1 2 000 .975 000 000 000 1 200 6 000 26 000 9,0O0 14,700 3,000 2,600 15,500 13,650 9,900 10,560 5,000 Estimated Construction Cost 5% Contingencies 20% Design, Inspection, Admin. 5% Capitalized Interest TOTAL ESTIMATED COST $259,085 12,954 $272,039 54,408 $326,447 16,322 $342,769 5. RECOMMENDED ALTERNATIVE Based on cost and logistics, we recommend Alternative 1. Both the disruption to local residents and the cost are greater under Alternative 2, while the benefit is the same as that provided by Alternative 1. The recommended alternative does not address problems of high ground water experienced in this area. The area around the intersection of McKinley and 40th had historically been a pond. This pond was filled upon development of the area, but ground water levels persist. In order to address groundwater seepage into basements, a drain tile system for this area might be required. Such a tile system would likely need to be drained to Silver Lake. Z ! :---'-"I A3-1GI~-I JO /kilo -Z o o (/3 W W Z W Z W ___ < 109' f, 175' 40TH AVE. 153" 31' 12' !132' 207 C~RB Z W" O_ UNDER IANDONED W Z W Rosene Anderlik & Associates Engineers & Architects Bonestroo, Rosene, Anderiik and A$$ociate$, tnt, is an Affirmative Action/Equal Opportunity Employer Principals: Otto G. Bonestroo, RE. · Joseph C. Anderlik, RE: · Marvin L, Sorvala, RE. · Richard E. Turner, RE, · Glenn R. Cook, RE. · Robert G. Schunicht, RE. · Jerry A. Bourdon, RE. · Robert 'W. Rosene, RE. and Susan M. Ebedin, C,RA., Senior Consultants Associate Princlpa/stHoward A, Sanford, RE · Keith A. Gordon, RE, · Robert R, Pfefferle, RE, · Richard W'. Foster, RE. · David O. Loskota, RE. · Robert C. Russek, A,I,A, · Mark A, Hanson, RE. · Michael % Rautmann, RE. · Ted K.Field, RE. · Kenneth R Anderson, RE. · Mark R. Roils, RE. · Sidney R ~¢illiamson, RE., L.S. · Robert F. Kotsmith · Agnes M. Ring · Michae~ R Rau, RE. · Allan Rick Schmidt, RE. O??/ees: St. Paul, Rochester, \x/illmar and St. Ctoud, MN ~,/eb$ite: www. bonestroo.com FEASIBILITY STUDY FOR STORMWATER IMPROVEMENTS MONROE STREET NE AND 49TM 1/2 AVENUE NE COLUMBIA HEIGHTS, MINNESOTA BRA FILE No. 33209 This report presents the results of our stormwater improvements feasibility study for the intersection of Monroe Street NE and 49th ½ Avenue NE. As detailed in our scoping study repor~ dated 11/25/97, the intersection has been prone to flooding during large rainfall events. Please note that elevations referenced in this report are in the city of Minneapolis datum, followed in parenthesis by the USGS datum. The USGS datum is obtained from the Minneapolis datum by adding 710.3 feet. 1. INTRODUCTION The intersection of Monroe Street NE and 49th ½ Avenue NE flooded during all three of the July 1997 storms (see Figure I). The water rose to at least three feet above the catch basins. During the July 1 storm, the runoff overflowed to the west, toppling retaining walls on its way to the alley behind Monroe Street NE. The inlet grate elevations at this intersection are at 184.31' (894.61'), 184.35' (894.65'), and 184.08' (894.38') (see Figure 2). The high water level (HWL) for the July 1 storm was estimated at 186.84' (897.14'). The lowest house elevation at this intersection is 186.60' (896.9') and occurs at 4935 Monroe Street NE. Residents have indicated that flooding also occurs at this intersection during smaller storms throughout the summer. The area that drains to this intersection includes the Central Avenue business district that contains large amounts of impervious surfaces. The runoff from this area is conveyed down 50th Avenue NE. Although the storm sewer network is laid out to convey this flow north to Sullivan Lake, most of the runoff bypasses the catch basins at Monroe Street NE and 50th Avenue NE, and overflows south to the intersection of Monroe Street NE and 49th ½ Avenue NE. 2335 LY/est Highway 36 · St. Paul, MN 55113 . 612-636-4600 · Fax: 612-636-1311 ANALYSIS AND RESULTS We modeled the stormwater system using XP-SWMM32 computer software. For existing conditions, the model predicts yard flooding around the intersection of Monroe Street NE and 49th ½ Avenue NE for storms as small as a t-year storm event (2.3 inches of rainfall over 24 hours). For the event on July 1, 1997, the model calculates a high-water level (HWL) of 186.3' (896.6'), slightly lower than the observed HWL of 186.84' (897.14'). This computed HWL was determined with the assumption that all the catch basins were free of clogging from leaves and debris. Homeowners explained that these drains were partially plugged during the July storms, thus causing the HWL to exceed the predicted level. Table I summarizes the modeling results of several storms with the existing pipe network. Table 1 Storm Summary . Returb'~; i Rainfali ,HWL 'I L~WH0use i FreebOard DrawdoWn :: ~p~riod -: : ~,~ ~, . ~ , . : :~: Time ~, (in); (City Dat,um) i ~(City Dat,um). :: (ft) (hr): 1-year 2.3 185.1 t 186.6 I 1.5 2.5 5-year 3.1 185.2' I 186.6' t t .4 4.0 50-year 5.3 186.1' t 186.6' I 0.5 7.0 100-year 6.0 186.3'1 186.6' 1 0.3 8.5 July 1, 1997 3.64 186.3' I 186.6'I 0.3 (3.5+)~ 1) Beyond the modeling period of 3.5 hours. 3. ALTERNATIVES A number of alternatives to capture and divert runoff from the Central Avenue business district were considered. These included combinations of new storm sewer and street regrading. It was found that these alternatives were very expensive and did little to reduce HWLs at the intersection of Monroe Street NE and 49th ½ Avenue NE. The local drainage area to this intersection is large enough such that unacceptable HWLs would still occur; diverting the Central Avenue area tended only to reduce the duration of the flooding. For this reason, the two alternatives presented below focus not on diverting runoff away from the affected intersection, but rather on conveying flows out of the intersection. 3.1 Alternative 1: Improve Catch Basins This alternative includes the replacement or rehabilitation of the existing catch basin structures at the intersection of Monroe Street NE and 49th Avenue NE (see Figure 2). Our field survey results and residents comments indicate that the existing catch basins become plugged with debris on a regular basis. The structures would be replaced with catch basin inlets that have larger curb inlets and vane grates which minimize clogging. As part of this work, localized curb raisin9 behind the catch basins will be required. This alternative also includes the installation of a speed bump or minor road raise on 50th Avenue NE immediately east of the intersection with Monroe Street NE. This will create minor pondin9 at the catch basins on 50th Avenue NE, increasing the capacity of the catch basins. The catch basins will thus capture more of the runoff from the Central Avenue business district, conveying it north to Sullivan Lake. This alternative results in a HWL of 186.3' (896.6') at the intersection of Monroe Street NE and 49th ~ Avenue NE. This will provide a freeboard of 0.3 feet to the lowest home at this i.ntersection (4935 Monroe Street NE), at an elevation of 186.6' (896.9). We recommend that the catch basins at this intersection be inspected and cleaned on a regular basis, particularly in the spring and fall. In addition, the streets draining to the intersection should be placed on a priority street sweeping schedule. 3.2 Alternative 2: Trunk Storm Sewer This alternative involves the installation of a storm sewer system from the intersection of Monroe Street NE and 49th ½ Avenue NE, north to Sullivan Lake. New catch basins will be installed at the intersections of Monroe Street NE and 49th ½ Avenue NE and 50th Avenue NE that wilt attach to the new system. Figure 2 presents the proposed layout of the system. Due to the topography of the area, the storm sewer will become fairly deep in some sections, Table 2 shows the effect this project would have on the HWL at the intersection of Monroe Street NE and 49th ½ Avenue NE. Table 2 Alternative 2 Improvements . HWE :;;:[ ::,::Low I,-~: , ..... . Drawdown ',,: ~.; t~: :" I t-reeDoaro ~[orm F :mouse:: I time event: (City : Ci :: : : ; ·' atum):, ~. :Datum) :(ft). L, . (hr) Before I July 1 186.8 186.6 Improvements After July 1 185.6 186.6 1.0 2.0 Improvements 100 year 185.6 186.6 1.0 t 2.0 4. COST ESTIMATES Cost estimates are provided for both alternatives. 4. t Alternative 1 Cost Estimate Table 3 presents the cost estimate for Alternative 1, Improve Catch Basins. Table 3 Estimated Cost: Alternative 1 Item Mobilization Remove concrete curb and gutter B618 curb and gutter Bituminous type 31B Bituminous type 41B R-3250-1 Catch Basin Traffic Control Unit Quanti~ Unit Price LS 1 $1000 LF 4OO 1.00 LF 400 6.00 TN 115 30 TN 115 32 EA 6 350 LS 1 500 Estimated Construction Cost 5% contingencies 20% Design, Inspection, Admin 5% Capitalized Interest TOTAL ESTIMATED COST Cost $1ooo 400.00 2,400 3,450 3,680 2,100 5OO $13,530 677 $14,207 2,841 $17,048 852 $17,900 4.2 Alternative 2 Cost Estimate Table 4 presents the cost estimate for Alternative 2, Trunk Storm Sewer. Table 4 Estimated Cost: Alternative 2 Item Mobilization Remove concrete curb and gutter B618 curb and gutter Full depth pavement Reclamation Common Excavation, street, off- site disposal Subgrade preparation Select granular borrow Aggregate base, class 5, in place Bituminous type 31B Bituminous type 41B 15-inch RCP 18-inch RCP 27-inch RCP, some over depth 30-inch RCP, some over depth 42-inch RCP Rip Rap 6' manhole, some over depth 2' x 3' Catch Basin R-3250-1 Catch Basin Traffic Control Unit Quantity Unit Price LS 1 $10,000 LF 2400 1.00 LF 2400 6.00 SY 4540 0.75 CY 3560 7.00 SY 5340 0.65 TN 3520 5.00 TN 2350 6.50 TN 375 30 TN 375 32 LF 50 25 LF 50 30 LF 600 50 LF 350 55 LF 350 75 CY 30 40 EA 5 2,000 EA 5 1,000 EA 6 350 LS 1 2,000 Estimated Construction Cost 5% contingencies 20% Design, Inspection, Admin 5% Capitalized Interest TOTAL ESTIMATED COST Cost $1o,ooo 2,400 14,400 3,405 24,920 3,471 17,600 15,275 11,250 12,000 1,250 1,500 30,000 19,250 26,250 1,200 10,000 5,000 2,100 2,000 $213,271 10,664 $223,935 44,787 $268,722 13,436 $282,158 5. RECOMMENDED ALTERNATIVE We recommend proceeding with Alternative 1 on an interim basis, and Closely monitoring flood levels in the future. In addition, the catch basins should be regularly inspected and maintained, and the streets on the vicinity placed on a priority street sweeping schedule. In the future, particularly when Monroe Street NE is scheduled for reconstruction, we recommend looking in greater detail at the alternative of constructing a new storm sewer to Sullivan Lake. Alternative 1 provides minor improvement to the drainage system and provides a freeboard of 0.3 feet to the lowest home in the area under the 100-year design storm. This level of protection is less than the desired freeboard of 1 to 2 feet. Alternative 2 provides 1 foot of freeboard but entails a considerable investment in storm sewer improvements, potentially approaching the value of the affected homes. z °~ z i, 0 l_d A3ICII~-I -lO AllO -Z j n,- ~z ~ Bonestroo R°sene Anderlik & Associates Engineers & Architects Bonestroo, Rosene, Anderfik and As$ociate~, Inc. ir an Affirmative Actior~,/Equa[ Opportunity Employer Principals: Otto G, Bonestroo, ,RE. · Joseph C. Anderlik, RE. · Marvin L. Sorvala, RE. · Richard E: Turner, RE, · Glenn R. Cook, P.E. · Rober~ G. Sehunicht, P.E. · Jerry A, Bourdon, RE. · Robert V(/. Rosene, RE, and Susan M. Eberlin, C.RA., Senior Consultants ,~$$ociate Principals: Howard A, Sanford, RE, · Keith A, Gordon, Richard VOL Foster, RE, · David O. Loskota, RE. · Robert C. Russek, AJ.A. · Mark A, Hanson, RI, · Michae~ T, Rautmann, RE. · Ted K.Field, RE. · Kenneth R Anderson, Sidney R Williamson, RE,, L.S. · Robert F. Kotsmith · Agnes M, Ring · Michael R Rau, RE, · Allan Rick Schmidt, O£?ice$: St. Paul, Rochester, '¢(/illmar and St. Clot~d, MN ~f/ebsite: www, bonestroo.com FEASIBILITY STUDY FOR STORMWATER IMPROVEMENTS dACKSON POND SYSTEM COLUMBIA HEIGHTS, MINNESOTA BRAA FILE NO. 33207 This report presents the results of our stormwater improvements feasibility study for the Jackson Pond system. As detailed in our scoping study report dated 11/25/97 the Jackson Pond system included five specific floOd prone areas. These areas are as follows (see Figure 1): ...... .'- ~ 1. Jackson Pond 2. 4500 block of Washington Street NE 3. 4300 block of Washington Street NE 4. 1307 42nd Avenue NE 5. Tyler Place NE and 44th Avenue NE In the scoping study we also had included the alley between 5th and 6th Streets NE. As noted in that report; we did not feet that this isolated sanitary backflow warranted analysis separate from a general study of the City's infiltration and inflow (I/1) problems. Since Bonestroo Engineering is not proceeding with an 1/I study at this time, this area will not be covered in this feasibility report. We have separated this report into five sections based on the five areas listed above. Each section begins with an introduction to the problem area followed in sequence by the following sections: Analysis and Results, Alternatives, Cost Estimates, and Recommenaed Alternative. A location map and report figures are included at the end of this report. Please note that elevations are in the City of Minneapolis datum, followed in parenthesis by the USGS datum. The USGS datum is obtained from the Minneapolis datum by adding 710.3 feet Another area not covered specifically within this report warrants discussion here. The banks parking ramp between 40th Avenue NE and Gould Avenue NE, immediately east of Central Avenue, has experienced chronic flooding. Our inspection of the site indicated that flow down the north gutter line of Gould Avenue NE enters the parking ramp, rather than continuing down to Central Avenue. Field survey information obtained by city staff indicates that drain rim elevations in the parking ramps' lowest level are approximately 213.3' (923.6'). The normal water level (NWL) of Labelle Pond is 213.0' (923.3'), which indicates that high water levels in Labelle Pond contribute to flooding in the parking ramp. We recommend that the inflow from Gould Avenue NE be eliminated. Once this is accomplished, and if flooding continues, then the bank would have to consider additional measures such as pumping or raising the ramp floor. 1. Jackson Pond 1.1. Introduction This area includes Jackson Pond itself and its immediate vicinity. More specifically, this section concerns itself with the flooding that occurred at 43r~ Avenue NE and Jackson Street NE, the operation of the Jackson Pond outlet, the potential for stormwater backup into the sanitary sewer system, and the operation of the 60-inch trunk line under 44th Avenue NE. As noted in resident survey responses, flooding regularly occurs at the intersection of Jackson Street NE and 43rd Avenue NE. During the storms of July I, 11, and 13, 1997, this was also the case. The larger of the storms, that of July 1, caused flooding that reached the garage at 4256 Jackson Street NE. Our field survey information puts this garage at an approximate elevation of 183.3' (893.6'). Across the street from 4256 Jackson Street NE lies a concrete spillway constructed to convey storm water from the intersection into Jackson Pond. The spillway invert elevation is approximately 182.0' (892.3'). Jackson Pond's primary outlet consists of a 48-inch CMP connected to the 60-inch rd trunk at a manhole on 43 Avenue NE. An aluminum flap gate at the manhole prevents backflow into the pond from the trunk line. To this pipe's east lies a 42-inch inlet from the same trunk that conveys flow from the trunk to the pond or from the pond to the trunk, depending upon the head difference between the two. Jackson Pond can overflow into the sanitary sewer system via a release pipe at its south end. Pond water can back into a manhole connected to this pipe and then enter the sanitary sewer system. The reverse can also occur. Two flap gates can prevent this connection, but during the storms of July 1997 these gates were open. As mentioned above, Jackson Pond discharges into the 60-inch trunk under 44~h Avenue NE. This trunk conveys stormwater to the west and meets a 36-inch trunk line at University Avenue. From University Avenue, the storm sewer runs west then north where it meets a 76-inch pipe that carries water to the Mississippi River. 1.2. Analysis and Results Using the XP-SWMM32 computer software, we analyzed the Jackson Pond system from Labelle Pond to well past the trunk connection at University Avenue. In order to simplify our modeling, we analyzed the system's peRormance for the storm of July 1, 1997 and not for the subsequent July 11 and July 13 storms. The. tipping bucket rain gauge at the public works facility indicated that the July 1 storm was the most intense of the July storms, with over 3.64 inches of rain in 3.5 hours and 2.9 inches in the first hour. Our model suggests that flow over the spillway should have been sufficient to prevent the flooding near the garage at 4256 Jackson Street NE. Anecdotal evidence from residents suggests and our model verifies that ponding does occur at this intersection and that the ponding persists long after large storms have blown over. Our field survey information confirms that water will rise 0.5 ft in the intersection before overflowing down the spillway, but this should in no way flood any adjacent structures. Again, anecdotal evidence from City staff suggests that the spillway became clogged with debris and that this held water back to the level seen on July 1. Our results give a July 1 high water level (HWL) for Jackson Pond of 178.7' (889.0'), so the pond did not overtop its banks and cause flooding - a conclusion which is supported by resident testimony. The aluminum flap gate delays the Jackson Pond discharge until surcharge subsides in the 60-inch trunk. Our model suggests that this outlet works well and allows the full utilization of Jackson Pond's storage without flooding adjacent property. Our results indicate that Jackson Pond discharged a 2-cfs peak flow into the sanitary sewer system. Once the City controls its I/I problem in this area, this connection should be eliminated. 1.3. Recommended Alternative We recommend that the City reconstruct the spillway at Jackson and 43rd. The existing spillway invert elevation of 182.0' (892.3') would suffice. The spillway design should consist of a 16' wide trapezoidal cross-section to a typical catch- basin/manhole. After the manhole the spillway should flare so that excess flow enters Jackson Pond over a wide area. Figure 2 provides some details of this construction. Item 1.4. Cost Estimate As detailed in Table 1, the estimated cost for this improvement is $15,414. Table 1 Estimated Cost: Jackson Pond Spillway Unit Quantity Unit Price Cost Concrete, 6-inch cast in place Common borrow Reconstruct CB-MH Sod SF 2,4OO $3.5O TN 480 5.00 LS 1 500 SY 100 3.50 $8,400 2,400 50O 35O Estimated Construction Cost 5% Contingencies 20% Design, Inspection, Admin. 5% Capitalized Interest TOTAL ESTIMATED COST $11,650 583 $12,233 2,447 $14,680 734 $15,414 2. 4500 Block of Washington Street NE 2.1. Introduction The storm sewer that conveys flows from this area does not connect to the Jackson Pond system. We attached it to the Jackson Pond Feasibility Study because it was included with the Jackson Pond system in the scoping study. The low point of the 4500 block flooded during all three of the July storms. The residents here have witnessed similar flooding in other years for storms of varying intensities. At this Iow point, the grate elevations of the two catch basins are 187.5' (897.8') and 187.7' (898.0'). The lowest house elevation is 188.4' (898.7') and occurs at 4542 Washington Street NE. In an effor[ to reduce flooding at this location, City staff recently installed an additional catch basin. It should be noted that, save for 4542 Washington Street NE, the flooding in this area was garage and yard flooding. 2.2. Analysis and Results With existing pipe sizes, the XP-SWMM32 model developed for this area predicts flooding for storms as small as the 1-year storm event (2.3 inches of rainfall over 24 hours). For the event of July 1, 1997, the model calculates a HWL of 190.3' (900.6'). Due to the lack of pipe capacity in this area, flood levels persist welt beyond the tapering of rainfall intensity. Table 2 summarizes the results of several storms with the existing pipe network. Conflicting anecdotal evidence made it difficult to calibrate the model for this area. For instance, the resident at 4540 Washington Street NE reported water up to but not flooding her home. Field surveys have established 190.6' (900.9') as the Iow elevation of this house. On the other hand 4559 Washington Street NE, which is higher, reported water entering through Iow house openings. 2.3. Alternatives 2.3.1. Alternative 1 This alternative consists of the purchase and removal, for sale, of the home at 4542 Washington Street NE. We recommend excavation of the lot in order to provide temporary storm water storage, and thereby reduce the flooding of adjacent structures. This temporary ponding could drain to the existing storm sewer through a 12-inch plastic pipe. 2.3.2. Alternative 2 Berm construction may protect these homes from smaller events but would raise the flood stage for larger events. Our modeling suggests that a 25% reduction in the area below 190.3' (which would likely occur in berming around these houses) raises the July 1 HWL to 190.6' (900.9'). If berming reduced the area below 190.3' (900.6') by 50%, then the HWL for the July storm would rise to 190.8' (901.1'). Most likely, there is not enough area around these houses to berm to 190.8'. Since berming cannot solve the area's flooding problem, we looked at new trunk storm sewer under Washington Street NE and ponding in McKenna Park as the only feasible alternative (see Figure 3). We evaluated improvements that could lower the 100-year HWL below the house at 4542 Washington Street NE. Accomplishing this requires larger storm sewer under Washington Street NE to McKenna Park. Because it is not economically feasible to replace any of the trunk storm sewer under 48th Avenue NE, the recommended improvements cannot increase peak flows downstream of the park. This requires a pond in McKenna Park. The pond will need 1.6 acres of land at pond HWL and 2.9 ac-ft of flood storage. We recommend a dry pond 5 feet in depth. Construction of this pond will require the removal of much of the 8-inch and 10-inch storm sewer within the park. Table 2 Storm Summary: 4500 Block of Washington Street NE Rainfall HWL Low House Freeboard Storm (in) (City Datum) (City Datum) (ft) 1-year 2.3 189.4 -1.0 Before ~ 5-year 3.1 189.7 -1.3 Improve 50-year 5.3 190.4 -2.0 merits 100-year 6.0 190.5 188.4 -2.1 July 1 3.64 190.3 -1.8 After 100~year 6.0 187.1 1.3 Improve t ments July 1 3.64 187.9 0.5 1 ) Beyond the modeling period of 3.5 hours. Please note that the calculated 100-year flood level is higher than that for the July 1 storm under the existing system but lower under the proposed system. The proposed system substitutes conveyance (larger storm sewer) for storage (flooding around homes). Since the 100~year storm has lower rainfall intensities and higher rainfall volume than the July storm, it is not surprising that the 100- year HWL reacts differently to the proposed improvements. 2.4.Cost Estimates We have provided cost estimates for both alternatives. Table 3 presents the cost estimate for alternative 1, while table 4 presents the alternative 2 estimate. Table 3 Estimated Cost: Alternative 1, 4500 Block of Washington Street NE Item Unit Quantity Unit Price Cost Purchase and move 4542 Washington LS Excavation and embankment offsite disposal CY 2' x 3' catch-basin EA 12-inch PE pipe LF Seeding, landscape planting LS 1 $90,000 $90,000 400 10 4,000 1 1,000 1,000 40 20 800 1 4,000 4,000 Estimated Construction Cost 5% Contingencies Design, Inspection, Admin. 5% Capitalized Interest TOTAL ESTIMATED COST $99,800 4,990 $104,790 5,000 $109,790 5,490 $t15,280 Item Table 4 Estimated Cost: 4500 Washington Street NE Unit Quantity Unit Price Cost Mobilization LS Remove concrete curb and gutter LF B618 curb and gutter LF Full depth pavement reclamation SY Common Excavation, street, off-site disposal CY Subgrade preparation SY Select granular borrow TN Aggregate base, class V, in place TN Bituminous base type 31B TN Bituminous wear type 41B TN 12-inch RCP LF 15-inch RCP LF 21-inch RCP LF 27-inch RCP LF 33-inch RCP LF 36-inch RCP LF 12-inch FES EA 36-inch FES LF Rip rap CY Remove existing storm sewer LF 6' manhole EA 4' Diameter CB/MH EA Excavation, pond, off-site disposal CY Traffic control LS 1 $15,000 $15,000 1,800 1.00 1,800 1,800 6.00 10,800 3,400 0.75 2,550 2,670 7.00 18,690 4,000 0.65 2,600 2,640 5.00 13,200 1,770 6.50 11,505 280 30 8,400 280 32 8,960 100 22 2,200 20 25 500 82 35 2,870 107 50 5,350 594 65 38,610 475 70 33,250 1 600 600 1 1,700 1,700 40 40 1,600 1,000 5.00 5,000 4 2,000 8,000 2 1,500 3,000 2,300 7.00 16,100 1 2,000 2,000 Estimated Construction Cost 5% Contingencies 20% Design, Inspection, Admin. 5% Capitalized Interest TOTAL ESTIMATED COST $214,285 10,714 $224,999 45,000 $269,999 13,500 $283,499 We recommend alternative 1. The city of Columbia Heights should avail itself of every opportunity to create storm water ponding to solve flooding issues, rather than increasing storm sewer size. Additionally, alternative I has the benefit of a substantially lower cost than alternative 2. It should be noted that the home, once removed, would have a salvage value estimated at $13,000. This salvage value would reduce the estimated cost of alternative 1 to a net cost of $102,280. 3. 4300 Block of Washinqton Street NE 3.1. Introduction Similar to the 4500 block, flooding regularly occurs at the Iow point of the 4300 block of Washington Street NE. During all three storms of July 1997, floodwater inundated the basement at 4330 Washington Street NE, ponded against the foundation of 4332, and flooded the garage at 4332. Our field survey confirms that the house at 4330 Washington Street NE lies below the lowest catch basin by approximately 0.3' and that low areas below street elevation surround 4332. A private alley slopes toward 4330 Washington Street NE from the south, delivering its runoff to this lot. 3.2. Analysis and Results With existing pipe sizes, the XP~SWMM32 model developed for this area predicts a HWL for the July 1, 1997 storm of 188.3' (898.6'). The homes at 4330 and 4332 Washington Street NE have low elevations of 186.6' (896.9') and 187.5' (897.8') respectively. Based on anecdotal evidence, the calculated HWL matches well to that observed on July 1. The stormwater ponded at this site comes primarily from the intersection of 43~d Avenue NE and Washington Street NE. Though several catch basins serve this intersection, the 12-inch pipe to which they drain is undersized. This results in runoff bypassing these catch basins and collecting at the low point one-half block north. The bypass manhole at the Iow point allows flow to travel either north to the 60-inch trunk or east to Jackson Pond. Computer results suggest that surcharge on the pipe to the east and Iow capacity on the pipe to the north combine to produce the flooding in this area. 3.3. Alternatives 3.3.1. Alternative 1 This alternative consists of the purchase and demolition of the home at 4330 Washington Street NE and berming around 4332 (see figure 4). The abandoned lot would remain a city-owned outlot for temporary stormwater storage and would be excavated for grading around the house at 4332 Washington Street NE. The berm around 4332 Washington Street NE would rise to an elevation of 188.5' (898.8'). Sump pumps would discharge the runoff collected within the area surrounded by the berm to the adjacent catch basins. We recommend that the abandoned lot be excavated beyond the volume required to construct the berm so that there is a net increase in storage at this site. The outlot would lie below curb elevation but could drain to the existing storm sewer through a 12-inch plastic pipe and ditch type catch basin. Our field survey information indicates that, in order to match the berm into existing ground, grading would extend at least one lot to the north of 4332 Washington Street NE. Any lot isolated within the berm will require sump pumps. 3.3.2. Alternative 2 This alternative involves the reconstruction of Washington Street NE to 43rd Avenue NE and the replacement of the existing 310' of 15-inch RCP pipe with the same length of 36-inch RCP (see Figure 4). Since the existing manhole has insufficient diameter to accept this pipe, this would also be replaced. Table 4 shows the effect this project would have on the HWL for this site. Table 5 Storm Summary: Alternative 2 Improvements I HWL 4330 4332 Storm elevation elevation (City datum) (City datum) (City datum) Before Improvements July 1 188.3 After July 1 186.7 t 86.6 187.5 Improvements t 100- 186.4 year Please note that this alternative provides protection for the home at 4330 Washington Street NE for the 100-year storm but not for the July 1, 1997 storm. The level of protection (0.1 feet of freeboard) is less than that typically provided by new construction (1 to 2 feet of freeboard). 3.4. Cost Estimates We have provided cost estimates for both alternatives. Table 5 presents our Alternative 1 estimate while Table 6 presents the Alternative 2 estimate. Table 6 Estimated Cost: Alternative 1, 4300 Block of Washington St NE Item Unit Quantity Unit Price Cost Purchase and demolition 4330 Washington LS I=xcavation and embankment CY Sod SY 2' x 3' catch-basin EA Sump pumps EA 12-inch pi= pipe LF 6-inch PE pipe, from sump pumps LF Seeding, landscape planting LS 1 $75,000 $75,000 150 10 1,500 210 5.00 1,050 1 1,000 1,000 2 500 1,000 40 20 800 160 10 1,600 1 4,000 4,000 Estimated Construction Cost 5% Contingencies Design, Inspection, Admin. 5% Capitalized Interest TOTAL ESTIMATED COST $85,950 4,298 $90,248 5,000 $95,248 4,762 $100,010 Table 7 Estimated Cost: Alternative 2, 4300 Block Washington St NE Item Unit Quantity Unit Price Cost Mobilization Remove concrete curb and gutter B618 curb and gutter Full depth pavement reclamation Common excavation, off-site disposal Subgrade preparation Select granular borrow Aggregate base, class V, in place Bituminous base type 31B Bituminous wear type 41B 36-inch RCP Remove 15-inch RCP Replace diversion manhole Aluminum flap gate Traffic control Cut into existing manholes LS 1 $4,000 $4,000 LF 620 1.00 620 LF 620 6.00 3,720 SY 1,360 0.75 1,020 CY 1,070 7.00 7,490 SY 1,600 0.65 1,040 TN 1,060 5.00 5,300 TN 900 6.50 5,850 TN 110 30 3,300 TN 110 32 3,520 LF 310 70 21,700 LF 310 5.00 1,550 EA 1 4,000 4,000 EA 1 2,000 2,000 LS 1 2,000 2,000 EA 1 750 750 Estimated Construction Cost 5% Contingencies 20% Design, Inspection, Admin. 5% Capitalized Interest TOTAL ESTIMATED COST $67,860 3,393 $71,253 14,251 $85,504 4,275 $89,779 3.5. Recommended Alternative We recommend alternative 1. Upon future reconstruction of Washington Street NE in this area, larger storm sewers might be installed so that a combination of alternatives 1 and 2 are realized. Since alternative 1 does not require delay, and because it is consistent with the goat of solving flooding problems with ponding and not conveyance, we recommend the city proceed with the alternative 1 recommendations over those of alternative 2. lo 4. 1307 42nd Avenue NE 4.1. Introduction Several problems surface at this site, some of which appear on a yearly basis. This home sits at the bottom of a steep hill. Storm sewer conveys runoff from this site to the west, where it connects with the outlet from LaBelle Pond. Since there are no intermediate catch basins along the hilt to the east, large volumes of runoff at high velocity regularly jump the curb in front of 1307 42nd Avenue NE and enter the back and side yards, from where the water cannot drain. The catch basin in front of the house is not located at the low point, which is in front of the home's driveway. The house is not much higher than the curb, while the driveway slopes downward to the garage and the backyard. The resident claims the water jumps the curb and flows down the driveway several times a year. 4.2.Analysis and Results Street and driveway reconstruction to contain stormwater in the gutter would protect this home from small storms with return periods of 5 years and less. For the storms of July 1997, water ponded in this area, which indicates that simply improving gutter flow would not suffice for larger storms. For this low area at 1307 42nd Avenue NE, our XP-SWMM32 model calculated a July 1 HWL of 217.1' (927.4'). The model calculated the same HWL for the 100-year storm. Field surveying conducted by City staff gives 216.9' (927.2') as the lowest house elevation. Anecdotal evidence suggests that the HWL for the July 1 storm was higher than our model indicates. We feel this is due to gutter flow entering the property from the driveway. Once within the property this water cannot drain except through infiltration and evaporation. The elevation of the catch basin grate in front of this house is approximately 216.3', or 0.6' lower than the house. For large events, system capacity is not sufficient to adequately drain this area. Since there is no overflow from this low point, water ponds until drained by the storm sewer. Our modeling shows that the reduction in pipe size from a 42-inch to a 36- inch at 43rd Avenue NE and Pierce Street NE causes a backwater effect upstream to Labelle Pond and 42nd Avenue NE. During the early stages of the July 1 storm, water flowed against pipe grade. Not until the peak flows had passed from the storm sewer at 43rd Avenue NE and Pierce Street NE did significant discharge occur from Labelle Pond and 42nd Avenue. 4.3. Alternatives 4.3.1. Alternative 1 Alternative 1 consists of purchase and removal of 1307 42nd Avenue NE, similar to what was proposed for 4542 Washington Street NE. In order to protect adjacent homes, we recommend some excavation of this lot for temporary storm water storage. This temporary ponding would drain to the existing storm sewer via a 12-inch plastic pipe. 4.3.2. Alternative 2 The second alternative involves installation of an additional 18-inch pipe under 42nd Avenue NE. From an existing catch basin, this pipe would run approximately 220 feet west. It then would turn 90 degrees south and run approximately 160 feet to Labelle Pond through City owned property. The new pipe would cross above the existing 15-inch pipe with approximately 1.0' of clearance. This pipe installation would involve reconstruction of up to 300 feet of 42nd Avenue NE. Our model predicts a 0.5' reduction in the July 1 HWL from this installation (see Table 8). It bears repetition that gutter flow into the property should be eliminated as part of any alternative. Additionally, for both alternatives, we recommend a sump pump connected to the storm sewer system capable of draining the Iow areas around the house. Table 8 summarizes the effects of alternative 2. Table 8 Storm Summary: Alternative 2, 1307 42ndAvenue NE HWL Low House t Freeboard Storm (City datum) (City datum)t (fi) Before July I 217.1 -0.2 Improvements 216.9 After Improvements I July 1 I 216.6 0.3 I 100-year t 218.5 0.4 4.3.3. Alternative 3 Alternative 3 involves berming around the front of the home at 1307 42nd Avenue NE. The berm would tie into existing ground one lot to the east and west. Our XP-SWMM32 model indicates that berming to 218.0' (928.3') across the front of the property would not raise the HWL for either the July 1, 1997 or the 100-year storm above 217.1, provided that sufficient sump pump capacity is present to drain the area within the berm. 4.4. Cost Estimates We have provided cost estimates for all alternatives. Table 9 applies to alternative 1, purchase of 1307 42nd Avenue NE; table 10 represents alternative 2, installation of an 18-inch RCP; and Table 11 applies to alternative 3, berming around 1307 42nd Avenue NE. Table 9 Estimated Cost: Alternative 1, 1307 42nd Avenue NE Item Unit Quantity Unit Price Cost Purchase and move 1307 42nd Avenue NE Excavation and embankment offsite disposal 2' x 3' catch-basin 12-inch PE pipe Seeding, landscape planting LS 1 $9O,OOO CY 400 t0 EA 1 1,000 LF 40 20 LS 1 4,000 $90,000 4,0OO 1,000 8OO 4,000 Estimated Construction Cost 5% Contingencies Design, Inspection, Admin. 5% Capitalized Interest TOTAL ESTIMATED COST $99,800 4,990 $104,790 5,000 $109,790 5,490 $115,280 Item Table 10 Estimated Cost: Alternative 2, 1307 42nd Avenue NE Unit Quantity Unit Price Cost Mobilization Remove concrete curb and gutter B618 curb and gutter Full depth pavement reclamation Subgrade preparation Common excavation Select granular borrow Aggregate base, class V, in place Bituminous base type 31B Bituminous wear type 41B 18-inch RCP Cut into existing manhole Sump pumps 6-inch PE pipe, for sump pumps 4' standard manhole Traffic control LS 1 $2,500 $2,500 LF 600 1.00 600 LF 600 6.00 3,600 SY 870 0.75 653 SY 1040 0.65 676 CY 700 7.00 4,900 TN 690 4.84 3,340 TN 460 5.59 2,571 TN 75 3O 2,25O TN 75 32 2,4OO LF 380 30 11,400 EA 1 75O 75O EA 2 500 1,000 LF 140 10 1,400 EA 1 1,500 1,500 LS 1 2,000 2,000 Estimated Construction Cost 5% Contingencies 20% Design, Inspection, Admin. $41,540 2,077 $43,616 8,723 5% Capitalized Interest TOTAL ESTIMATED COST $52,340 2,617 $54,957 Item Table 11 Estimated Cost: Alternative 3, 1307 44.th Avenue NE Unit Quantity Unit Price Cost Mobilization Remove concrete curb and gutter B618 curb and gutter Excavation and embankment Sod Reconstruct driveway apron Sump pumps 6-inch PE pipe, for sump pumps Traffic control LS 1 $400 $4O0 LF 30 3.00 90 LF 30 17 510 CY 75 10 75O SY 75 5.00 375 LS 1 1,000 1,000 EA 2 500 1,000 LF 140 10 1,400 LS 1 25O 25O Estimated Construction Cost $5,775 5% Contingencies 289 $6,064 20% Design, Inspection, Admin. 1,213 $7,277 5% Capitalized Interest 364 TOTAL ESTIMATED COST $7,640 4.5. Recommended Alternative We recommend Alternative 1. The benefits of ponding over conveyance have been discussed previously in this memo. The salvage value of the home is estimated at $13,000, reducing the net cost to $102,280. It came to our attention late in the development of these reports that the home at 1125 42nd Avenue NE also experienced flooding due to the July 1997 storms. This flooding occurs at two catch basins adjacent to the home and the Labelle Park skating rink. This flooding occurs for the same reason as that further to the east. We recommend a shallow swale be cut to relieve the flooding and convey runoff to Labetle Pond. The city could construct this swale along the east end of the rink, though this may entail reducing the rink size. The cost of this construction has not been included in these cost estimates. 5. Tyler Place NE and 44~h Avenue NE 5.1. Introduction A 48-inch CMP carries the LaBetle Pond outflow as well as local runoff through this site. These flows pass with some surcharge through this pipe, a surcharge that 14 releases from a beehive catch basin in back of 1016 44th Avenue NE. During the July storms this backflow flooded an adjacent garage, one nearby apartment building, and entered the sunken patio of 1016 44th Avenue NE (but did little damage to the house itself). The pipe here is shallow; in fact, pinholes in the CMP spout water through the ground to the surface, causing bubbling of water out of the ground. 5.2. Analysis and Results The XP-SWMM32 model developed for the Jackson Pond system calculated a July 1, 1997 HWL of 206.0' (916.3') for this area. The Iow building elevation is 205.1' (915.4') and is found at the apartment building to the west of 1016 44th Avenue NE. The ground elevation at the tip of the drop to the patio at 1016 44th Avenue NE is approximately 205.3' (915.6'). Anecdotal evidence suggest that the July I HWL in this area was 2'-3' above the rim of the backyard CB. Field survey data collected by the City gives this rim elevation as 203.7' (914.0'), which would put the July 1 HWL somewhere between 205.7' (916.0') and 206.7' (917.0'). Watermarks on a nearby garage would suggest a HWL closer to 205.7'. Our computer-generated HWL of 206.0' (916.3') matches reasonably well with anecdotal data. Our modeling suggests that for a wide variety of storms ponding will occur in this area. The 48-inch CMP was not designed to carry flows from larger storms without the buildup of head on the system. That built-up head becomes evident around this backyard catch basin when water surges out from the pipe into the surrounding yard and parking lot. This, coupled with a sizable direct drainage area from the backyards that cannot enter the already full pipe, causes the chronic flooding in this area. 5.3. Recommended Alternative The recommended alternative for this area is to berm around all low structures to an elevation of 206.3' (916.6'). Replacing the leaky 48-inch CMP with an equivalent size RCP would reduce the 100-year and July 1 HWLs (both 206.0') by 0.2'. This alone would not solve the flooding problems in this area. Replacement of the 48-inch CMP will likely be needed in the near future, since evidence suggests the pipe is falling apart. It is recommended to be included in the City's CIP. To avoid exacerbating flooding in this area and new flooding in others, the replacement of this pipe should generally proceed from downstream to upstream. Our cost estimates include 227' of this installation. We do not recommend anything larger than 48-inch diameter pipe since no excess capacity exists in the system downstream. Alternatively, a 48-inch equivalent arch pipe might be installed to provide additional pipe cover. 5.4. Cost Estimate Table 10 presents the estimated cost for this improvement. Item Table 10 Estimated Cost: Tyler Place NE and 40~h Avenue NE Unit Quantity Unit Price Cost Mobilization Grading and embankment 48-inch RCP Remove 48-inch CMP Restoration, sod Sump pumps 6-inch plastic pipe, sumps to manhole Restoration: pavement, fences, etc. 8' diameter manholes LS 1 $3,000 $3,000 CY 200 10 2,000 LF 227 80 18,160 LF 227 10 2,270 SY 250 5.00 1,250 EA 3 5OO 1,500 LF 180 10 1,800 LS 1 5,000 5,000 EA 2 4,000 8,000 Estimated Construction Cost 5% Contingencies 20% Design, Inspection, Admin. 5% Capitalized Interest TOTAL ESTIMATED COST $42,980 2,149 $45,129 9,026 $54,155 2,708 $56,863 t6 Z i LLL A39C]121_-I _~0 ,kilo 0 Z W c5i W Z W w (/3 0 Q_ 0 (/3O OW oz_ ! '3A~ ~Z z 0 z 0 il ~ z ~° '3AV ~±9~ '3AY t-I..L L~ '3AV ~/1.. H_L/_-tz *3AY H_L 9'lz VNN-:I ON r3NOd N 0 t_.L N'-qi'q (] I,I 0 UO Z b_l Z Z 0 0 t~ 0 LLI 0 o LLI Z I'-- Lid rY I-- f./') Z 0 I-- Z I 0 0 0 0 0 I r-~ ~ ° -Z Z I'~ 0 rO I ~Z 0 0 ~ m Ci_ty of Columbia Heights Public Works Department Work Session Discussion Item Work session date: July 8,1998 n~~ Prepared by: Kevin Hansen, Public Works Director/City Engi Item: Relining of City Lines - MCES Sanitary Sewer Background: Staff has been reporting to the Council over the last several meetings of the MCES work at 45th Ave. and 2 ½ St. and the potential impacts to the City. Two 15" City lines, one to the north and one to the east of this intersection were cleaned and televised to evaluate their condition. Analysis/Conclusions: As reported to the City Council at the June 22nd meeting, the 15" line to the north has excessive deterioration and will be relined by the MCES sub-contractor, Insituform. The video inspection reports for the two 15" lines to the east were reviewed by the Public Works Superintendent and Utility Foreman. As reported in June 29~ weekly activity report, it is Public Work's recommendation to reline 668' of 15" sanitary sewer to the east of this intersection also. Requested Action: Approve the relining of 338' of 15" sanitary sewer (north) at a cost of $24,000, and to reline 668' of sanitary sewer (east) at an estimated cost of $38,135 with funds to be appropriated from the Sanitary Sewer Construction Fund, 652-49499-5130. City of Columbia Heights Public Works Department Work Session Discussion Item Work session date: July 8, 1998 Prepared by: Kathy Young, Assistant City Engineer Item: Sidewalk Repair Background: In 1985, the Engineering Department inspected the sidewalk located on public right of way or easement throughout the City. The Department determined which sections of sidewalk needed to be replaced, presented the information at a public improvement hearing, and assessed the adjoining property owners for the repair. In 1992, the Engineering Department again inspected the sidewalk for an improvement project. The Council elected not to proceed with the improvements which required assessments to property owners and only proceeded with repairs to sidewalk on streets designated as State Aid, CSAH and TH. As requests have been received from property owners for public sidewalk repair work as part of the Miscellaneous Concrete Project, the City has been requiring property owners to pay for public sidewalk replacement adjacent to their property. The Department has received complaints from residents about sidewalk throughout the city that needs repair. These have not been done because the City Code does not allow for the City to replace a sidewalk and bill the property owner with unpaid bills becoming an assessment (similar to the weed and tree program). Discussion: The Engineering Department would like direction in how to proceed with public sidewalk replacement on local streets. There are two issues: Funding and Selection of Repair Locations Funding · Amend the City Code to allow property owners to be assessed for public sidewalk repair · Use general fund for public sidewalk repair · Do nothing Selection of Repair Locations · Inspect and replace sidewalk on a request basis by the public · Inspect and replace sidewalk as it is reported by the public or City employees · Inspect and replace sidewalk on a zone basis Requested Action: Provide direction to staff on funding sources and inspection procedures, specifically ordinance preparation for sidewalk replacement. CITY OF COLUMBIA HEIGHTS Meeting of: July 13, 1998 AGENDA SECTION: ' ORIGINATING DEPART1VIENT: CITY MANAGER · Community Development APPROVAL ITEM: M°rat°rium °n St'Tim°th¥'Sproperty BY: Kenneth R' Anders°nDATE: July 1, 1998 .~ BY:~/~ 'J/'~ ISSUE STATEMENT: Due to the withdrawal of Mary T.-Incorporated from developing a 70 unit senior housing apartment project on property currently owned by St. Timothy's Lutheran Church (ELCA) at 825 51 ~ Avenue NE, a ten month moratorium on site improvements and/or development of the site and property is proposed to allow further study and analysis of appropriate land uses. BACKGROUND: A letter dated June 5, 1998, was submitted by Mary Tjosvold, Chief Executive Officer of Mary T. Incorporated, regarding the proposed 70 unit senior apartment building to be developed on property currently owned by St. Timothy's Lutheran Church. Mary T. Incorporated had been working in concert with Bruce Nedegaard of Nedegaard Custom Homes to develop, construct and operate a new senior apartment building in Columbia Heights. The letter indicated that Mary T. Incorporated would be withdrawing from development of either a "subsidized senior market or the upscale market" building project. Their reason for withdrawal was the rents that could be charged in Columbia Heights would not enable them to operate a quality services program in conjunction with the housing project (see attached letter). The City Council has previously acted upon all necessary planning and zoning approvals to enable this project to go forward in early fall of 1997. Furthermore, a tax increment financing district was established to assist in the project development. ANALYSIS: As a result of the withdrawal of Mary T. Incorporated, it is appropriate for an additional review of the development opportunities on this 2.28 acre site that was rezoned in 1997 from R-2, Two Family Residential District, to R-3, Multiple Family Residential District. To afford ample opportunity to perform the necessary review and analysis, a ten month moratorium on future development of the site will be necessary. The City Attorney has recommended that any moratorium should not exceed twelve (12) months (see attached memo). This ten month time period may be shortened should staff complete the necessary reviews and City Council takes other action by adoption ora resolution. The Councilmembers may recall that representations were made as part of the public hearing process to the adjacent property owners indicating that, as part of the zoning approval, the City Council was making the approval specific to the proposed senior housing project. If other uses are proposed that may be permitted in the R-3, Multiple Family Residential District for this site, there may be significant implications as to land use, traffic, public safety, and utility services to the site. Staff'has prepared the attached draf~ resolution for consideration by the City Council. This resolution specifies that a moratorium on site improvements and or development to the site will be in place for up to a ten month time period to allow further study and analysis. Moratorium on St. Page two Timothy's Property RECOMMENDATION: Staff is recommending adoption of Resolution 98- 55 , a resolution imposing a moratorium on site improvements and/or development of the St. Timothy's Lutheran Church site. Attachments: Proposed Resolution 98- 55 Mary T. Inc. letter of June 5, 1998 June 17, 1998 memorandum of City Attorney RECOMMENDED MOTION: Move to waive the reading of Resolution 98- ~ , there being ample copies available to the public. RECOMMENDED MOTION: Move to adopt Resolution 98- 55 , being a resolution imposing a ten month moratorium on site improvements and/or development of property owned by St. Timothy's Lutheran Church in Columbia Heights. COUNCIL ACTION: h: \edsec\wp8 \Counc il\ ltrT- 13-9 8 stt ims RESOLUTION 98- 55 BEING A RESOLUTION IMPOSING A TEN MONTH MORATORIUM ON SITE IMPROVEMENTS AND/OR DEVELOPMENT OF PROPERTY OWNED BY ST. TIMOTHY'S LUTHERAN CHURCH IN COLUMBIA HEIGHTS. WHEREAS, the City Council of the City of Columbia Heights has approved rezoning of certain property at St. Timothy's Lutheran Church, 825 51° Avenue NE from R-2, Two Family Residential District, to R-3, Multiple Family Residential District; and WHEREAS, the purpose of the rezoning request and approval therefor was to permit the development of a 70-unit, three story, market rate, senior housing rental apartment project by Nedegaard Custom Homes, Developer, and Mary T. Inc., owner and service provider; and WHEREAS, by letter dated June 5, 1998, Mary T. Inc. has informed officials of the City of Columbia Heights that they will no longer pursue a senior housing project in Columbia Heights; and WHEREAS, the City Council has represented in general terms to adjacent property owners that development at this site was intended for a senior rental apartment project only; and WHEREAS, the rezoning of this property to R-3, Multiple Family Residential District allows as permitted uses other types of projects includ/ng, but not limited to, townhouses, other multiple family dwelling structures, YMCA and similar non-profit organizations; and WHEREAS, the City Council determines it is necessaw to 1) conduct further research and analysis as to appropriate land uses for this surrounding area which currently consists of single family homes, church, public park, and retail business uses; and 2) identify appropriate zoning and performance standards for the subject property. NOW, THEREFORE, BE IT RESOLVED THAT the City Council of the City of Columbia Heights hereby establishes a moratorium not exceeding ten months on site improvements and/or development of property owned by St. Timothy's Lutheran Church in Columbia Heights, with said ten month time period commencing and effective the date of adoption of this resolution, and recognizing said ten month time period ma>, be shortened by adoption of a resolution of the City Council upon earlier consideration of staff findings. BE IT FURTHER RESOLVED that staffis Erected as part of the Comprehensive Plan update and Zoning Ordinance rewrite process to identify appropriate options for zoning of the subject property; development of recommended performance standards for the various zoning options; and presentation of the recommendations to the City Council before such time as the moratorium established by this resolution terminates. Passed this __ day of ,1998 Offered by: Seconded by: Roll Call: Mayor Joseph Sturdevant Jo-Anne Student, Council Secretary Mary T. Inc. JUN June 5, 1998 Ken Anderson Community Development Director City of Columbia Heights 590 40m Ave. NE Columbia Heights,' MN 55421 Senior Aparti~nents in Columbia Heights Greetings, For the past year the Mary T. Inc. organization has been working with St. Timothy's Church, the City of Columbia Heights, and Bruce Nedegaard to develop, construct, and operate a senior apartment program that is affordable. Our successful niche has been providing affordable housing services. We have decided not to pursue either the subsidized senior market or the upscale market. It.appears to us t_hit the rents we could comfortably charge m Columbia Heights would not enable us to operate the quality services program that we currently operate at Margaret Place in Coon Rapids. We would gladly share any and all reformation that we have gathered to ensure .that Columbia Heights could have an affordable senior apartment building. Thank you for giving us' this opportunity to explore the possibility of senior housing in Columbia Heights. Sincerely, , Mary M. Tjo.sv,ord, Ph.D. CEO ~/ Mary T. Inc. cc: Bruce Nedegaard 1555 lt8tt~ Lane Northwest Coon Rapids, Minnesota-55448 612 754 2505 Equal Oppormni(v Employer I CITY OF COLUMBIA HEIGHTS TO: FROM: DATE: RE: Mayor Joseph Sturdevant Councilmember Don Jolly Councilmember Gary Peterson Councilmember Marlaine Szurek Councitmember Bob Kuettimann Walt Fehst, City Manager Ken Anderson, Community Development Director Jim Hoeft, City Attorney~ rc,.~l(d/ June 17, 1998 Morator/um on St. Timothy's Property Watt recently informed me that due to the inability of the Mary T project to move forward, there were concerns expressed about the future of that property. The issue of placing a moratorium on the property was raised. Please be ad'vised that if a moratorium were to be placed on that property, the city needs to indicate specifically why the moratorium should be placed, what will be done during the time of the moratorium, and how long the moratorium will last. It is my recommendation that any such moratorium should not exceed a period of 12 months. Walt has instructed me to work with Ken Anderson on putting together an appropriate council letter for the council meeting on July 13~h. If any of you have any questions or concerns regarding this issue, please feel free to contact me. Cb CITY COUNCIL LETTER Meeting of..July 13, 1998 AGENDA SECTION: ORIGINATING DEPARTMENT: CITY MANAGER Fire APPROVAL NO: Community Development Schedule ' DATE: July 1, 1998 DATE: NO: ...... On October 13, 1997, the City Council adopted Ordinance #1358, establishing Section 8 of the Columbia Heights Code entitled "Administrative Offenses." This ordinance established the administrative tag system for the city. The system allows a person tagged for certain offenses to receive an administrative tag and to pay this tag at City Hall. If the person receiving the tag fails to respond within seven (7) days, then the code violation would be processed through the Anoka County court system. On November 10, 1997, the City Council amended this ordinance to include a penalty for parking between the hours of 2:00 am and 6:00 am on city streets from November 1 to March 31. To date, this is the only offense for which the administrative tag has been used. The attached Resolution would further amend Ordinance # 1358 to include a penalty for violations of several provisions of the city code. Fire Department staff intent would be to use the tag as a final administrative solution for owner-occupied properties that fail to comply with exterior inspection violations. This would provide additional power to the Housing Maintenance Code for these properties. We will continue to use the Revocation process as the final administrative process for rental property o~mers who do not comply. Community Development staff intent for the Administrative Tag is also to provide a final administrative solution for the ordinances which they reference. RECOMMENDED MOTION: Move to waive the reading of Resolution No. 98- 53, there being ample copies available to the public. RECOMMENTDED MOTION: Move to adopt Resolution No. 98-53 , Being a Resolution Regarding Amending Administrative Offense Penalty Schedule. COUNCIL ACTION: RESOLUTION NO. 98- % 3 BEING A RESOLUTION REGARDING AMENDING ADMINISTRATIVE OFFENSE PENALTY SClt'EDULE WHEREAS, the Columbia Heights City Council adopted Ordinance No. t358 on October 13, 1997, establishing Section 8 of the Columbia Heights Code entitled "Administrative Offenses," and, WHEREAS, Section 8 provides that penalties be imposed for violations of scheduled administrative offenses according to a schedule established, and amended from time to time by Resolution of the City Council, and, WHEREAS, it is the desire of the Columbia Heights City Council to amend said administrative offense penalty schedule, NOW, THEREFORE, BE IT RESOLVED by the City Council of the City of Columbia Heights that the administrative offense penalty schedule is amended as follows: Offense Description Code PenalW Refusing to Comply w/th any provision of Chapter 5A of the Columbia Heights Code 5A.61t $100.00 Contractors must be Licensed to Operate 5.607 $100.00 Failure to Abide by Provisions of the Zoning Code relating to Conditional Use Permits 9.105 (5) $100.00 Failure to Abide by Provisions of the Zoning Code relating to Signs 9.117A $100.00 Failure to Abide by Provisions of the Zoning Code relating to Performance Standards 9.117 $100.00 Passed this__ day of ., Offered by: Seconded by: Roll call: Mayor Joseph Sturdevant Jo-Anne Student, Council Secretary CITY OF COLUMBIA HEIGHTS 590 40th AVENUE N.E., COLUMBIA HEIGHTS, MN 55421-3878 (612) 782-2800 TDD 782-2806 INSPECTION DEPARTMENT MEMO TO: F ROM: SUBJECT: Honorable Mayor and City Council Members Mel Collova, Building Officia!~J/~/ Substandard Properties DATE: July 2, i998 With the City Council approval, the attached Resolutions will be forwarded to the City Attorney to pursue District Court approval to commence the demolition. Abatement funds will be used for these projects. Costs, including legal fees, will be assessed to the property in the form of a special assessment using the guidelines set forth in the Minnesota Hazardous Building Statutes. I have tried several times as evidenced by the attached documents, to persuade the property owners to waive the District Court proceedings and avoid additional fees. THE ClT~ OF COLUMBIA HEIGHTS DOES NOT DISCRIMINATE ON THE BASIS OF DISABILITY IN EMPLOYMENT OR THE PROVISION OF SERVICES EQUAL OPPORTUNITY EMPLOYER ,-"CITY OF COLUMBIA HEIGHTS (1'") 590 40TH AVENUE N.E., COLUMBIA HE~C=~?S. MN 55,,42 '1 -3878 (812) "782-2800 TDO 782-2EB01S May 7, 1997 James Rude and Owner of Record 1260 N.E. 46th Avenue Columbia Heights, Mn. 55421 Dear Mr. Rude: RE: Condition of property known as 1260 N.E. 46th Avenue PiN #25-30-24-34-0086 On the morning of May 7, 1997 an on site inspection of the subject property was conducted and photographs were taken to record the following conditions which are contrary to the Minnesota State Building Code. The Minnesota State Building Code includes but is not limited to the 1994 Uniform Building Code (UBC), the Minnesota Plumbing Code and the Minnesota Energy Code. 1. The building has been posted a "Dangerous Building" and occupancy is hereby suspended as of this date (UBC Section 102, UBC Section 109.8). 2. The only active building permit is for the house wrap which has not been completed. 3. There are several excavations around the house without first applying for the required permits (UBC Section 106). 4. There appears to be foundation construction in process at the rear of the dwelling without first submitting plans and specifications as required (UBC Section 108.3), and applying for the required permit (UBC Section 106). 5. The outside appearance of the .property constitutes a public nuisance as'known to common law or in equity jurisprudence (Uniform Code for Abatement of Hazardous Buildings Section 302). tn order to receive occupancy of the dwelling, you are ordered to correct the listed conditions as follows: 1. Repair and certify the existing plumbing as safe by a properly licensed plumber after obtaining the proper permits (Mn. Plumbing Code 4715.2800, 4715.2810, 4715.2820) and shall meet the requirements of the Plumbing Code as new plumbing (Mn. Plumbing Code 4715.2850, Mn. Statutes 326.37 to 326.45). ' 2. Obtain proper permits for ongoing ~onstruction with a time table for completion and proof of financial capability to complete all projects. 3. Provide proper barriers for excavations immediately. 4, Clean up and remove all debris, dismantled vehicles, etc. immediately. 5. Provide documentation that the ongoing construction will not exceed 50% of the existing building value. Improvement values must be in accordance with Minnesota State Guidelines. CiTY OF COLUMBIA HEIGHTS (!') SM 4(:rrl..l AVENUE N.~'., COLUMBIA HEIGHTS, MN 5~,,~J..~'J-38'78 (61'm). 'TS'm-2J~OO'TJ:)[~ '78;~-2806 August 12, 1997 James Rude and Owner of Record 1260 N.E. 46th Avenue Columbia Heights, Mn. 55421 Dear Mr. Rude: This letter is regarding the condition of the property located at 1260 ~I.E. 46th Avenue. This office must receive the following required documentation within ten {10) days or not later than August 22, 1997: 1. Architectural andfor engineered drawings of any further remodeling of the structure located at 1260 46th Avenue. 2. Proof of financial capability to complete the projects in a timely manner. Your property has been declared an "eyesore" and a public nuisanca as known to the common taw and has been posted. Failure to comply within the ten day time period will lead to City Council action to condemn and raze the structures and remove any and all debri from the demolition along with any other debri on the site. The excavation will be filled'with clean fill. The casts of this process will be assessed to the property taxes. If you wish to appeal this order, you must contact Tina Goodroad at 782-2858 during normal business hours. If you have any questions regarding the content of this letter, you may contact my office at 782-2818. Sincerely, Mel Collova Building Official #1727 MClkp CC: J. Sturdevant, Mayor W. Fehst, City Manager J. Hoeft, City Attorney K. Anderson, Dir. of Comm. Dev. CiTY 01:' COLL~Mt~IA HEIGHTS OOES NOT C)ISCRIMINAT~:' ON THc` BASIS OF' DISA~alLITY IN EMR.{:.OYM~'NT OR THE PROVISION CITY OF COLUMBIA I-IEIGHTS EXCAVATION COSTS LABOR: ADDRESS: , ~ ~ ~ C ;"/$ ~ ~ ¢'~- DATE: '_~ -- 7~ - ~; ~c.4 TIME: "-~.: <'c', Employee Name [No. of Hours IRate/Hour +40% [Cost ,:~:",.,, ?i. :;,, i:,: ,: 'i'% ,::i, :,i ,.::,,: ·: ,.:,,::TOtal' Labor" , ':' :: , M. ATERIALS: Number Description of Item Price/Each ] Cost S ~,~-x 48.00 i: ' EQUIPM. ENT: Equipment [ No. of Hours IRate/Hour tCost Backhoe 25.00 ',':, ',' ,:' Dump Truck NOTE: FINANCE DEPT. STA~CF WLLL CON[PLE'I'L SHADED AREAS. have reviewed :he above materfals used and hours for labor and equipment, and certify that the above accz~ratety iista :he time and materials spent on the excavation. £ fitr:her certify :hat rim time spent on excavation and rej~air is appropriate. ~S~up~dntehdent.~ Public Works Department - ~ Dai~ Approved for billing Finance Director/Assistant Finance Director Dare Page 2 Notice and Order 1260 N. E. 46th Avenue 302(9) Whenever, for any reason, the building or structure, or any portion thereof, is manifestly unsafe for the purpose for which it is being used. 302(!0) Whenever the exterior walls or other vertical structural members list, lean or buckle to such an extent that a plumb line passing through the center of gravity does not fall inside the middle one third of the base. 302(!!) Whenever the building or structure, exclusive of the foundation, shows 33 percent or more damage or deterioration of its supporting members, or 50 percent damage or deterioration of its non supporting members, enclosing or outside walls or coverings. 302(12) Whenever the building or structure has been so damaged by fire, wind, or flood, or has become so dilapidated or deteriorated as to become (i) an attractive nuisance to children; (ii) a harbor for vagrants, criminals, or immoral persons; or as to (iii) enable persons to resort thereto for the purpose of committing unlawful or immoral acts. 302(17) Whenever any building or structure is in such a condition as to constitute a public nuisance known to the common law or in equity jurisprudence. 302(18) Whenever any portion of a building or structure remains on a site after the demolition or destruction of the building or structure or whenever any building or structure is abandoned for a period in excess of six months so as to constitute such building or portion thereof an attractive nuisance or hazard to the public. The structures must be razed, all required permits must be applied for within 60 days of receipt of this notice and must be completed within 90 days of permit issuance. If the timetable stated is not met, the City may proceed to cause the work to be done and charge the costs thereof against the property or its owner. crier COUNCIL L~ Meetin8 off July 13, 1998 AGENDA SECTION: Public Hearing ORIGINATING DEPT.: CITY MANA~ i No= Co~m,~ Development APPROVAL ITEM: 3900 Central Avenue N.E. PIN # 35-30-24- BY: Mel Collova BY: 44-0006 Declaration of Hazardoua Property NO: DATE: July 2, 1998 ... Back~ On the property located at 3900 Central Avenue N. E .Avenue the exists a garage nad retaining wall both have remained in a substandard, unsightly, and hazardous condition since February 25, 1998. The Building Official has mailed several notices to the property owner and she has not complied with the various orders or the offer to allow the City to correct the condition by waiver. The retaining wall remains in disrepair and the gnrage remains in a hazardous condition. The fee owner of the property has signed awaiver allowing the City to raze the garage, remove the retaining wall and ~ade the lot to eliminate the need for a retaining wall. No formal appeal has been filed by any of the interested parties and no permit has been applied for within the time specified in the Notice and Order. Recommended Motion: Move to waive the reading of the resolution, there being muple copies available to the public. Recommended Motion: Move to Adopt resolution , Declaring the garage and retaining wall located at 3900 Central Avenue N.E. as hazardous. To raze the garage and remove the retaining wall, to grade the lot to eliminate the need for a retaining wall. COUNC-~ ACTION: Page 2 Authorization 3900 Central Avenue N.E. I do further release and discharge the City of Columbia Heights from any action or cause of action, claims and demands for damages by myself or by my heirs or assigns as the result of the razing and removal of such structures. It is understood that the City if Columbia Heights shall be under no obligation because of this authorization to remove or rage the structures above described and that the removal or razing, under the terms of this authorization is subject to the approval of the City Council of the City of Columbia Heights. In the presence of: S:ate of Minnesota On this ,~' day of , before me and to be known to be the persons described in and who executed the foregoing instrument, and acknowledge that they executed the same as their own free act and deed. · ~ / Notary Public Stamp/Seal/ SiEnature Page 2 Notice and Order 3900 Central Avenue N.E. 302(10) Whenever the exterior walls or other vertical structural members list, lean or buckle to such an extent that a plumb line passing through the center of gravity does not fall inside the middle one third of the base. 302(I!) Whenever the building or structure, exclusive of the foundation, shows 33 percent or more damage or deterioration of its supporting members, or 50 percent damage or deterioration of its non supporting members, enclosing or outside walls or coverings. 302<12) Whenever the building or structure has been so damaged by fire, wind, or flood, or has become so dilapidated or deteriorated as to become (i) an attractive nuisance to children; (ii) a harbor for vagrants, criminals, or immoral persons; or as to (iii) enable persons to resort thereto for the purpose of committing unlawful or immoral acts. 302(17) Whenever any building cr structure is in such a condition as to constitute a public nuisance known to the common law or in equity jurisprudence. 302(18) Whenever any portion cf a building or structure remains on a site after the demolition or destruction of the building or structure or whenever any building or structure is abandoned for a period in excess of six months so as to constitute such building or portion thereof an attractive nuisance or hazard to the public. The structures must be razed, all required permits must be applied for within 80 days of receipt of this notice and work must be completed within 90 days of permit issuance. If the timetable stated is not met, the City may proceed to cause the work to be done and charge the costs thereof against the property or its owner. I have enclosed a legal form giving the City the authorization to conduct the work. If you would prefer the City could cause the work to be done. The cost of the work would be assessed to the property in the form of a special tax assessment. By signing the authorization, legal costs would be eliminated. I urge you to consider this action. The authorization form must be notarized and returned to this Department. INCIDENT REPORT .. ,=. o.~¥.~ COLUMBIA H HTS POL~CF ~'-~,.~ STATE EMPLOYED AT AUTHORIZATION TO RAZE HAZARDOUS BUILDING i~ the undersigned~ Thomas E. Sullivan of 2519 Central Avenue N.E., Hennipen County, Minnesota: state that ! am the fee owner of record of the premises commonly known as 8900 Central Avenue N.E., PIN ~ 35-80-24-44-0008~ and legally described as Lot 20, Block $2~ Columbia Heights annex to Mpts~ Anoka County, MN, according to the map or plat thereof on file or of record in the office of the County Recorder (Register of Deeds) of the County of Anoka: State of Minnesota; there now exists on the premises a certain detached building at the northwest corner of the premises and a retaining wall at the west property line, which structures I agree and admi~ are hazardous structures as defined by ....... ~innesota Statu==~ Section 48~ 15 to aS3 ~$~ ~ ~ in that they ~ _ con_~itute a hazard to public safety and health because of age~ physical damage~ inadequa+= maintenance and dilapidation~ and which structures i agree and admit may be beyond reascnab!e ~'~a~ ~-~ may ~ ~azed ~=~,~ ~=~ .... =,~ i further state that there is another ~,- ...... ~,~a ~ ~erea Redes, that has a ~'h --= ..... ~ ........ a= ..... ~ these premises. ! do hereby authorized the City cf Columbia Heights pursuant to Minnesota Statutes, Section 483.151, to raze such structures and to remove the materials therefrom the premises: including foundation of the structures~ grade the area to meet the surrounding area and to levy and collect the expense of such razing and grading as a special charge against the real estate on which the structures are situated, as provided by Minnesota Statutes, 48S.!51~ and ! waive any right to a hearing on such assessment as well as any other objection to any failure to oomp!y with the Statutes setting out the procedure for such assessment. i further state that there are no items of personal property or fixtures on such premises in the structures which I determine to be of any value and ! hereby authorize the City of Columbia Heights to dis9ose of any personal property or fixtures thereon or within the structures. = ~= - =ha~! have so~= determination The City o~ Coiumb~a_ He_=ht= _ , _~ as to how the work is to be done and as ~o whether it is done by bid or contract or csherwlse: and ~ re!ease~ re~,~i~h__..=~ _ a~.~,.._ waive any -~-'~-e.~ to any acc,~unting~ . of the cost or expenses involved in ~he razing and removal. P~¢e 3 Authorization 3900 Central Avenue N.E. Comment: The City Council may remove or raze and hazardous structure to remove or correct any hazardous condition if it obtains consent in writing of all owners of record, occupying tenants, and all !ienho!ders of record. The Council may provide for assessing the cost under local improvement code in not to exceed five annual installments, with interest at 8 (eight) percent a year (M>S. 483.!51).