Loading...
The URL can be used to link to this page
Your browser does not support the video tag.
Home
My WebLink
About
COmprehensive Sanitary Sewer Plan April 1999 File No 55-99-101
I CITY OF OAK PARK HEIGHTS Comprehensive Sanitary Sewer Plan Oak Park Heights, Minnesota April, 1999 File No. 55 -99 -101 Bonestroo Rosene ELAN Anderlik & Associates Engineers & Architects I 1 1 April 14, 1998 Honorable Mayor and City Council City of Oak Park Heights ' PO Box 2007 Oak Park Heights, Minnesota 55082 -2007 Re: 1999 Draft Comprehensive Sanitary Sewer Plan Our File No. 55 -99 -101 Dear Mayor and Council: Transmitted herewith is the Draft Comprehensive Sanitary Sewer Plan for City of Oak Park Heights. ' This plan provides a guide for expanding and upgrading the trunk sanitary sewer system to meet the Cities long -term needs. The trunk sanitary sewer system is presented on Figure M -1 Sanitary Sewer System Map. Data regarding population, land use, sewer design, and cost estimates have been incorporated into the text and appendices of the report. The information presented in this report is based on costs and data that were available in the fall of 1998. We would be pleased to discuss the contents of this report and the findings of our study with the City Staff or other interested parties at any mutually convenient time. Respectfully submitted, ' BONESTROO, ROSENE, ANDERLIK & ASSOCIATES, INC. ' Mitchell L. Johnson MLJ:kef 1 I I I hereby certify that this report was prepared by me or under my direct supervision and that I am a duly Registered Professional Engineer under the laws of the State of Minnesota. Daniel J. Edgerton, P.E. Date: April 14, 1999 Reg. No. 19206 i i i i DRAFT COMPREHENSIVE SANITARY SEWER PLAN OAK PARK HEIGHTS, MINNESOTA APRIL, 1999 DAVE SCHAAF DAVID BEAUDET JANET ROBERT MARK SWENSON JERRY TURNQUIST TOM MELENA MARK VIERLING JAY JOHNSON OFMIL A COUNCIL MEMBER COUNCIL MEMBER COUNCIL MEMBER COUNCIL MEMBER ADMINISTRATOR ATTORNEY P/W DIRECTOR BONESTROO, ROSENE, ANDERLIK & ASSOCIATES, INC. ENGINEERS /ARCHITECTS I I I F I 11 City of Oak Park Heights Draft Comprehensive Sanitary Sewer Plan Table of Contents Section Page Tableof Contents ..................................................................................................... ..............................2 Listof Tables ........................................................................................................... ..............................2 Listof Figures .......................................................................................................... ..............................2 Listof Appendices ................................................................................................... ..............................2 ExecutiveSummary ................................................................................................. ..............................4 City of Oak Park Heights Draft Comprehensive Sanitary Sewer Plan 2 1 . Introduction ..................................................................................................... ..............................7 2 . Tier I Information .......................................................................................... ..............................9 t 3. Sanitary Sewer Design Criteri a ................................................................ .............................12 3.1 Land Use .......................... ......................................................................... .............................12 3.2 Estimated Average Wastewater Flows ' ..................................................... 3.3 Peak Flow Factors ..................................................................................... .............................12 .............................13 3.4 Infiltration/Inflow In Existing System ...................................................... .............................15 I 3.5 Large Sewer Users .................................................................................... 3.6 Hydraulics and Pipe Material .............................15 ................................................................... .............................15 4. Proposed Sanitary Sewer Trunk System ............................................... 4.1 Summary ................................................................................................... .............................16 .............................16 4.2 Wastewater Flow Projections ................................................................... .............................17 4.3 Intercommunity Flows,,,,,,,,,,,,,,,, , , ..................................................... ............................... 18 4.4 Individual Sewage Treatment Systems (ISTS) ........................................ .............................18 City of Oak Park Heights Draft Comprehensive Sanitary Sewer Plan 2 I I I I I 1 i I 5. Design Options and Recommendations ................................................. .............................19 5.1 System Description ................................................................................... ............................. 5.2 Northern Sanitary District ......................................................................... ............................. Additional Special Issues ......................................................................... ............................. 5.3 Westem Sanitary District .......................................................................... ............................. Additional Special Issues ......................................................................... ............................. 5.4 Southern Sanitary District ......................................................................... ............................. 6 . Cost Estimates ............................................................................................... ............................. List of Tables 7. Recommendations ..................................................... ............................... Table 1.1 Sanitary Sewer Districts ......................................................................... .............................. Table 2.1 City of Oak Park Heights Projections .................................................... ..............................9 .........................Design Flows (MGD) for the Interim System Table 2.2 Wastewater Flow Projections ............................................................... .............................10 Appendix E ................................... Table 3.1 Wastewater Unit Flow Rates ................................................................ ............................. .......................Ultimate Trunk System Design and Capacity Information Table 4.1 MUSA Expansion Area Projections .................................................... .............................18 Appendix H ................................................................... Table 4.2 Projected Average Flows - City of Oak Park Heights ......................... .............................19 ............................... Phased Cost Estimates Table 4.2 Projected Average Flows - City of Oak Park Heights ......................... .............................19 Table 5.1 Northem Sanitary District Land Use ................................................... .............................20 Table 5.2 Western Sanitary District Land Use ..................................................... .............................22 Table 5.3 Southem Sanitary District Land Use ................................................... .............................22 List of Figures Figure 3 -1 Peak Flow Factors ................., Figure 6 -1 Concept and Staging Map .... Figure M -1 Sanitary Sewer System Map I List of Appendices I I I 14 Back of Report Appendix A .................................... ............................... ..........................Areas for the Ultimate System Appendix B .............................................. ............................... Average Flows (MGD) for the Districts Appendix C ............. ............................... .........................Design Flows (MGD) for the Interim System Appendix D ........................... ........................Interim Trunk System Design and Capacity Information Appendix E ................................... ............................... Design Flows (MGD) for the Ultimate System Appendix F .......................... .......................Ultimate Trunk System Design and Capacity Information Appendix G .............................................................................................. Trunk System Cost Estimates Appendix H ................................................................... ............................... Lift Station Cost Estimates AppendixI ........................................................................... ............................... Phased Cost Estimates Appendix J ........................... ............................... .........................Sewage Disposal Systems Ordinance City of Oak Park Heights Draft Comprehensive Sanitary Sewer Plan 3 I Executive Summary The Metropolitan Land Planning Act (amended 1995) requires local governments to prepare comprehensive plans and submit them to the Metropolitan Council to determine their consistency with metropolitan system plans. The local comprehensive plan is to include a sanitary sewer element that describes the collection and disposal of wastewater generated by the community. Similarly, the Metropolitan Sewer Act requires local governments to submit a comprehensive sewer policy plan, which describes the current and future service needs from the Metropolitan Council Environmental Services (MCES). The Draft of the City of Oak Park Heights' Comprehensive Sanitary Sewer Plan (Draft CSSP) presented herein provides the reader with the core results of the sanitary sewer plan. The Draft CSSP —as will the Final CSSP —serves as an inventory of the existing trunk sewer system and a guide for the expansion and upgrading of the City's trunk sewer system to meet the future requirements of the City by accommodating anticipated growth. i The City of Oak Park Heights is located in the north - central portion of Washington County positioned along the south side of State Highway 36 between Manning Avenue and the St. Croix ' River. The local economy is based on a mixture of commercial and industrial activities. The majority of these activities are located along the State Highway 36 corridor. t Currently, all wastewater collected in the City is conveyed to the Stillwater Wastewater Treatment Plant via the MCES Stillwater, Bayport, and Oak Park Heights Interceptors. The interceptors run north from Bayport and south from Stillwater along State Highway 95 to the treatment plant, which is located on the east side of State Highway 95 at approximately Upper 61" Street North. All wastewater generated by the City enters the MCES Interceptor at a point near 59 Street North and State Highway 95 and flows north to the treatment plant —with the I exception of Sub - Districts N -1 and N -0; where Sub - District N -1 discharges into the MCES Interceptor north of the treatment plant and flows south and Sub - District N -0 is the MCES Treatment Plant Site. To accommodate anticipated growth patterns, the City is planning for potential sanitary sewer service to two major regions outside of the current City limits by the year 2015. The areas and staging dates are shown on the Concept and Staging Plan Map (Figure 6 -1) taken from the City's Draft Comprehensive Plan. ' City of Oak Park Heights Draft Comprehensive Sanitary Sewer Plan 4 I The larger of the two regions is located south of the existing City boundary primarily between Stagecoach Road and Northbrook Boulevard. The other smaller region is located north of 50 Street between State Highway 5 and Manning Avenue. A portion of this region, known as the Kern Center, has recently been annexed by the City. Sanitary sewer plans and specifications have been completed for the Kern Center and are under contract for completion in 1999. This report focuses on evaluating the existing trunk system and its associated lift stations and locating future trunk lines and lift stations to efficiently and economically provide sewer service to these two major regions. The location of smaller sewer laterals and service lines are dependent upon future land development plats and cannot be accurately located from a study of this type. i The modeling of the sanitary sewer system is based on a variety of parameters, such as: land use, population density, standard wastewater generation rates, topography, and future land use plans. Based on the topography of the undeveloped areas, sanitary sub - districts were created and the most cost - effective locations for future trunk line facilities were determined. To generate 1 potential flow rates for each sub - district, the area of each land use category was calculated within each sub - district. These values are presented in Appendix A. With estimated population density figures for each land use category and known unit rates of wastewater generation per capita, the resulting product yields an average wastewater flow for each sub - district. These values are presented in Appendix B. Based on the Concept and Phasing Map (Figure 6 -1), the years for expansion in 2000 and 2005 1 define the core stages of sanitary sewer expansion and installation. To that end, two design scenarios were investigated, an interim and an ultimate design. Design nodes were created along each trunk line where two or more pipes merge or the pipe gradient or pipe size changes enough r to be hydraulically significant. The pipe capacity or design flow was then calculated between the nodes. These values are presented in Appendices C (interim) and E (ultimate). Appendices D ' (interim) and F (ultimate) summarize the proposed trunk lines and their basic design characteristics. Regardless of any final adjustments in the routing and size of the trunk facilities ' that may take place as determined by the specific land use conditions at the time of final design, the design criteria presented in this report will provide the City with the most economical ultimate design capacity sanitary sewer system. I City of Oak Park Heights Draft Comprehensive Sanitary Sewer Plan S I C� 11 i The Sanitary Sewer Map (at the back of the report) depicts the sanitary sewer sub - districts, layout of the existing trunk sanitary sewer system, and the general layout of the future or ultimate design sanitary sewer system. Both the existing and the ultimate design sewer system will include use of lift stations and force mains. The existing gravity lines in the system have been designed for the anticipated increased flows associated with the fully developed scenario for the City. This report confirms that the existing system, with few exceptions, has adequate capacity to accommodate the future addition of the areas to the west and south. The proposed future lines depicted in this report will need to be sized accordingly at the time of expansion for full development. Lift stations and force mains will be required to service certain areas. Sub - Districts W -11, W -12, W -13 and W -14 will be serviced via lift stations W11LS and W13LS (WI ILS is under contract for installation in 1999). W 13LS has been proposed to provide service to the low -lying area in the western part of Sub - District W -13. Due to the proposed staging of the expansion, an interim lift station, W4LS, has been proposed to service Sub - District W -4. Lift stations W4LS and N20LS can ultimately be eliminated with the completion of the trunk line in the Southern District. Upgrading of lift station W7LS will be required to accommodate the expansion to the west. The upgrade of W7LS would likely be done in several phases since the increase of wastewater generation from the western sub - districts will also come in phases. One upgrade phase for W7LS must include a 75 -foot extension of the force main to enable it to discharge into ' a larger pipe and obtain increased capacity. District N -5 is currently serviced via lift station NSLS. It has been anticipated that a conduit would be installed under Hwy. 36 during the proposed Hwy. 36 reconstruction. This would eliminate the need for NSLS. I I I Construction cost estimates were developed for the completion of the ultimate trunk system and are included in Appendices G, H, and I. These trunk facilities typically include lift stations, force mains, and all gravity lines ten inches (10 ") in diameter and larger. In addition, any pipes required to convey sewage from lift stations are included. The estimated cost to expand the trunk sewer system and replace existing pipes with inadequate capacity is $2,147,000. City of Oak Park Heights Draft Comprehensive Sanitary Sewer Plan 0 I 1 1. Introduction I The Metropolitan Land Planning Act (amended 1995) requires local governments to prepare comprehensive plans and submit them to the Metropolitan Council to determine their consistency with metropolitan system plans. The local comprehensive plan is to include a sanitary sewer element covering the collection and disposal of wastewater generated by the community. Similarly, the Metropolitan Sewer Act requires local governments to submit a comprehensive sewer policy ' plan which describes the current and future service needs required from the Metropolitan Council Environmental Services (MCES). ' The City of Oak Park Heights is located in the north - central portion of Washington County positioned along the south side of State Highway 36 between Manning Avenue and the St. Croix 1 River. The local economy is based on a mixture of commercial and industrial activities. A majority of these activities are located along the State Highway 36 corridor. ' This Draft Comprehensive Sanitary Sewer Plan (Draft CSSP) is intended to serve as an inventory of Oak Park Heights' existing trunk sewer system and a guide for the expansion and upgrading of the City's trunk sewer system to accommodate future growth. It presents an overall trunk layout for the City and surrounding areas that will meet the immediate and future requirements of the City by ' accommodating anticipated growth. The Sanitary Sewer Map (at the back of the report) depicts the sanitary sewer districts and sub - districts (see Table 1.1). The Map also shows the layout of the existing trunk sanitary sewer system and the general layout of the future or ultimate design ' sanitary sewer system. I it �l 1 City of Oak Park Heights ' Draft Comprehensive Sanitary Sewer Plan 7 I 1 Table 1.1 Sanitary Sewer Districts Sewer District Sub - District Notation Northern District N -1 Through N -20 Western District W -1 Through W -14 Southern District S -1 Through S -6 To accommodate anticipated growth patterns, the City plans to provide sanitary sewer service to ' two major regions outside of the current City limits by the year 2015. The areas and staging dates are shown on the Concept and Staging Plan Map (Figure 6 -1) taken from the City's Draft 1 Comprehensive Plan. The larger of the two regions is located south of the existing city boundary primarily between Stagecoach Road and Northbrook Boulevard. The other smaller region is located north of 50 Street between State Highway 5 and Manning Avenue. A portion of this region, known as the Kem Center, has recently been annexed by the City and sewer plans and specifications have been completed and are under contract for completion in 1999. ! The Metropolitan Council's Local Planning Handbook describes Tier I and Tier 11 levels of content requirements for the sanitary sewer element of comprehensive plans. Tier I content requirements apply to all communities' comprehensive plans. Tier R content requirements apply only to communities that plan to alter, expand or improve their sewage disposal system. In order to ' facilitate the review process, Tier I information will be addressed in Section 2 of this report. Tier II information is contained in the re mainin g sections of the report. �j I 1 City of Oak Park Heights Draft Comprehensive Sanitary Sewer Plan 8 2. Tier I Information This section contains information required for Tier I review by the Metropolitan Council. Table 2.1 presents projections of households, employees, and sewered population for the entire City. Numbers for the years 2000, 2010, and 2020 are from the Metropolitan Council's Water Resources Management Policy Plan (updated 1997) and population estimate from the City of Oak Park Heights. Numbers for intermediate years are interpolated. Table 2.1 City of Oak Park Heights Sewered Population, Housing and Employment Projections Year Estimated Number of Homes Estimated Number of Employees Estimated Total Population (MCES)' Estimated Total Population (City)' Estimated Sewered Population 2000 1,650 3,100 3,900 5,000 3,900 2001 1,705 3,205 4,025 5,100 4,025 2002 1,760 3,310 4,150 5,200 4,150 2003 1,815 3,415 4,275 5,300 4,275 2004 1,870 3,520 4,400 5,400 4,400 2010 2,200 4,150 5,150 6,000 5,150 2015 2,500 4,325 5,800 6,750 5,825 2020 2,800 4,500 6,450 7,500 6,500 1. Data from the Metropolitan Council's Water Resources Management Policy Plan (updated 1997). 2. City of Oak Park Heights' City Engineer estimate. City of Oak Park Heights Draft Comprehensive Sanitary Sewer Plan 9 r, I 2. Tier I Information This section contains information required for Tier I review by the Metropolitan Council. Table 2.1 presents projections of households, employees, and sewered population for the entire City. Numbers for the years 2000, 2010, and 2020 are from the Metropolitan Council's Water Resources Management Policy Plan (updated 1997) and population estimate from the City of Oak Park Heights. Numbers for intermediate years are interpolated. Table 2.1 City of Oak Park Heights Sewered Population, Housing and Employment Projections u 1 1 I P 1 Year Estimated Number of Homes Estimated Number of Employees Estimated Total Population (MCES)' Estimated Total Population (City)' Estimated Sewered Population 2000 1,650 3,100 3,900 5,000 3,900 2001 1,705 3,205 4,025 5,100 4,025 2002 1,760 3,310 4,150 5,200 4,150 2003 1,815 3,415 4,275 5,300 4,275 2004 1,870 3,520 4,400 5,400 4,400 2010 2,200 4,150 5,150 6,000 5,150 2015 2,500 4,325 5,800 6,750 5,825 2020 2,800 4,500 6,450 7,500 6,500 1. Data from the Metropolitan Council's Water Resources Management Policy Plan (updated 1997). 2. City of Oak Park Heights' City Engineer estimate. City of Oak Park Heights ' Draft Comprehensive Sanitary Sewer Plan 6 C I i I I i H L 11 I 1 Table 2.2 presents a comparison of draft CSSP and Metropolitan Council's projections of average flows for the City of Oak Park Heights. Draft CSSP numbers are based on anticipated growth areas, land use, and unit wastewater generation rates. These numbers were used for the design of the trunk sewer system presented in this report. Metropolitan Council numbers for the years 2000, 2010, and 2020 are from the Metropolitan Council's Water Resources Management Policy Plan (updated 1997). Numbers for intermediate years are interpolated. Table 2.2 Wastewater Flow Projections Year Estimated Average Flow (MGD) (CSSP)' Estimated Average Flow (MGD) (MCES)' 2000 1.3370 0.0601 2001 1.4252 0.1344 2002 1.5134 0.2086 2003 1.6016 0.2829 2004 1.6898 0.3571 2010 2.219 0.8027 2015 2.499 0.8904 2020 2.499 0.9781 1. Data from the Oak Park Heights Draft Comprehensive Sewer Plan. 2. Data from the Metropolitan Council's Water Resources Management Policy Plan (updated 1997). City of Oak Park Heights Draft Comprehensive Sanitary Sewer Plan FA Currently, all wastewater collected in the City is conveyed to the Stillwater Wastewater Treatment Plant via the MCES Stillwater, Bayport, and Oak Park Heights Interceptors. The interceptors run north from Bayport and south from Stillwater along State Highway 95 to the treatment plant, which is located on the east side of State Highway 95 at approximately Upper 61 Street North. All wastewater generated by the City enters the MCES Interceptor at a point near 59` Street North and State Highway 95 and flows north to the treatment plant —with the exception of Sub - Districts N -1 and N -0; where Sub - District N -1 discharges into the MCES Interceptor north of the treatment plant and flows south and Sub - District N -0 is the MCES Treatment Plant Site. The flow projections are based on the Proposed Land Use Plan presented in the City of Oak Park Heights Comprehensive Plan. The phasing of the sanitary sewer trunk system through the year 2020 is based on the Concept and Staging Plan also presented in the City of Oak Park Heights Comprehensive Plan— included in this report as Figure 6.1. The Sanitary Sewer Map at the back of 1 this report shows the existing and proposed sanitary sewer trunk system for the entire City. I I 1 P I I I I City of Oak Park Heights ' Draft Comprehensive Sanitary Sewer Plan 11 I I I [J 1 1 F I I �1 I 3. Sanitary Sewer Design Criteria 3.1 Land Use The land use plan from the City of Oak Park Heights Comprehensive Plan served as the basis for the development of the sanitary sewer trunk system. The ultimate land use plan and population densities for residential areas were developed by working with City Staff. In many areas, the ultimate land use is different t'hap current zoning. Future land uses include residential, quasi - public, schools, government, commercial, commercial business, industrial, public, institutional, highway business warehouse, park facilities/open space, and estate residential/golf course. Descriptions of the various land uses are found in the City of Oak Park Heights Comprehensive Plan. The land uses are shown on the sanitary sewer map at the back of the report, and areas of each land use by sewer sub - district are presented in Appendix A. 3.2 Estimated Average Wastewater Flows Municipal wastewater is made up of a mixture of domestic sewage, commercial and industrial wastes, groundwater infiltratioromd surface water inflows. With proper design and construction, groundwater infiltration and surface water inflows, often called infiltration/inflow (1/1), can be minimized. The flows due to UI are accounted for in the analysis and design of the trunk sewer system. The anticipated average wastewater flows from the various sub - districts were determined by applying unit flow rates to each of the land use categories. The unit flow rates used are presented in Table 3.1. The average wastewater flows for each sub - district are presented in Appendix B. City of Oak Park Heights Draft Comprehensive Sanitary Sewer Plan 12 I I 1 I I 11 i 1 I n L 7 � V I 3. Sanitary Sewer Design Criteria 3.1 Land Use The land use plan from the City of Oak Park Heights Comprehensive Plan served as the basis for the development of the sanitary sewer trunk system. The ultimate land use plan and population densities for residential areas were developed by working with City Staff. In many areas, the ultimate land use is different tIW current zoning. Future land uses include residential, quasi- public, schools, government, commercial, commercial business, industrial, public, institutional, highway business warehouse, park facilities/open space, and estate residential/golf course. Descriptions of the various land uses are found in the City of Oak Park Heights Comprehensive Plan. The land uses are shown on the sanitary sewer map at the back of the report, and areas of each land use by sewer sub - district are presented in Appendix A. 3.2 Estimated Average Wastewater Flows Municipal wastewater is made up of a mixture of domestic sewage, commercial and industrial wastes, groundwater infiltratiorWand surface water inflows. With proper design and construction, groundwater infiltration and surface water inflows, often called infiltration/inflow (M), can be minimized. The flows due to III are accounted for in the analysis and design of the trunk sewer system. The anticipated average wastewater flows from the various sub - districts were determined by applying unit flow rates to each of the land use categories. The unit flow rates used are presented in Table 3.1. The average wastewater flows for each sub - district are presented in Appendix B. City of Oak Park Heights Draft Comprehensive Sanitary Sewer Plan 12 Table 3.1 - Wastewater Unit Flow Rates Land Use Type Persons/Lot Gal/Person/Day Gal/Acre/Day Low Density Residential 165 90 954 (3 -4 lots /acre) Medium Density Residential 2.65 80 1,272 (4 -6 lots /acre) High Density Residential 2.65 70 2,226 (10 -12 lots/acre) Commercial/Industrial _ - -- --"' 1,000 Public/Institutional - - - -- —"' 1,500 0 Parks/Open space ----- -- 3.3 Peak Flow Factors The sanitary sewer system must be capable of handling the anticipated peak wastewater flow rate including any 1/1. The design peak flow rate can be expressed as a variable ratio to the average flow rate. Curves used to describe this ratio, called the peak flow factor (PFF), indicate a decreasing ratio of peak flow to average flow with increasing average flow. The PFF values applied in this study are shown in Figure 3 -1 as a curve and in tabular form. These values are generally conservative and widely used throughout the state for municipal planning. They include a standard allowance for I/I, which is typical of new sanitary sewer construction as well as properly operating existing sewers. In City of Oak Park Heights, there are no known areas of excessive I/1. The design flows for each sub - district are presented in Appendix C. City of Oak Park Heights Draft Comprehensive Sanitary Sewer Plan 13 PEAK FLOW FACTORS Q Rosene PEAK FLOW AVERAGE DAILY FACTOR FLOW LIMITS (MGD) 4.0 0.00 - 0.11 3.9 0.12 - 0.18 3.8 0.19 - 0.23 3.7 0.24 - 0.29 3.6 0.30 - 0.39 3.5 0.40 - 0.49 3.4 0.50 - 0.64 3.3 0.65 - 0.79 3.2 0.80 - 0.99 3.1 1.00 - 1.19 3.0 1.20 - 1.49 2.9 1.50 - 1.89 2.8 1.90 - 2.29 2.7 2.30 - 2.89 2.6 2.90 - 3.49 2.5 3.50 - 4.19 2.4 4.20 - 5.09 2.3 5.10 - 6.39 2.2 6.40 - 7.99 2.1 8.00 - 10.39 2.0 10.40 - 13.49 1.9 13.50 - 17.99 1.8 18.00 - 29.99 1.7 OVER 30.00 4.0 3.5 3.0 2.5 2.0 PEAK FLOW FACTOR PEAK FLOW FACTORS 18 16 14 12 u 10 � W Q 8 Lli Q Z CD 6 j/ W 0 4 2 0 1.5 OAK PARK HEIGHTS, MINNESOTA FIGURE 3 -1 COMPREHENSIVE SANITARY SEWER PLAN \55 \5599101 \CAD \5599101W01.DWG COMM. 14159 4 \99 Bonestroo Q Rosene Anderlik & Associates 3.4 Infiltration/Inflow In Existing System ' The City of Oak Park Heights is unaware of any significant M problems with the existing sanitary system. However, standard amounts of I/I can be expected and are compensated for through the ' application of the design peak flow factor. 3.5 Large Sewer Users There are currently no large sewer users (greater than 50,000 gallons/day) discharging into the City's sanitary sewer system. ' 3.6 Hydraulics and Pipe Material The trunk sewer system was designed to prevent surcharging and maintain a minimum flow velocity of 2 feet per second at design flow. The existing and proposed pipe capacities were calculated based on inlet control and outlet control and are presented in Appendices D and F. ' The use of plastic pipe is recommended for all pipe of 10" diameter and less. Above 10" diameter pipe, either plastic or reinforced concrete pipe is recommended. Plastic pipe is superior to concrete, especially in the smaller sizes, for several reasons. First, the joints require less care and form a better seal, reducing I/1. Second, plastic pipe comes in greater lengths, resulting in fewer joints and fewer opportunities for 14, Finally, plastic pipe is lighter, easier to handle, and less expensive to install. ' For design purposes, reinforced concrete pipe was used in most cases to be conservative at this level of design, since pipe flow friction is greater for concrete, diminishing its hydraulic capacity. ' At the time of final design and construction, adjustments in the routing, choice of material, and size of the trunk facilities can be expected as determined by the particular conditions at that time. In ' some cases, the pipe size may be reduced if plastic pipe is chosen over concrete pipe. ' It is recommended that the City of Oak Park Heights institute an annual pipe - cleaning program to maintain the hydraulics of the sewer system and prevent any buildup of sediment and sludge in the pipes. Until full development of the study area, some pipes will be oversized with regard to interim ' flows. Sediment will tend to accumulate in these oversized pipes. If this material is not removed, corrosion problems could develop. 1 1 City of Oak Park Heights ' Draft Comprehensive Sanitary Sewer Plan 15 I 1 1 r, I I I C [J 11 I LJ F I 4. Proposed Sanitary Sewer Trunk System 4.1. Summary The trunk sewer system layout for City of Oak Park Heights is presented on Figure M -1, the Sanitary Sewer Map, located at the back of this report. This map shows the three main sanitary sewer districts, sub - districts, existing and proposed trunk sanitary sewers, and existing and proposed lift stations and force mains. The modeling of the sanitary sewer system was based on a variety of parameters, such as: land use, population density, standard wastewater generation rates, topography, and future land use plans. Based on the topography of the undeveloped areas, the sanitary sub - districts were created and the most cost - effective locations for future trunk line facilities were determined. The location of smaller sewer laterals and service lines are dependent upon future land development plats and cannot be accurately located from a study of this type. Both the existing and proposed pipe systems were evaluated and broken up into design segments. Each end of a design segment has a node assigned to it. Design nodes were created along each trunk line where two or more pipes merge or the pipe gradient or pipe size changes enough to be hydraulically significant. Occasionally, a section of pipe was broken out because of physical barriers, (e.g., road crossings) or where the change in the cost of pipe installation became significant. The nomenclature for the nodes consists of three characters: 1) A letter corresponding to the main district within which it is located. 2) A number corresponding to the particular sub - district. 3) A number after the decimal point identifying the unique node within the sub - district, e.g., N9.2. The nodes within each subdistrict are generally labeled with ascending decimal numbers starting with the most downstream node to the most upstream node. Based on the Concept and Phasing Map (Figure 6 -1), the years for expansion in 2000 and 2005 define the core stages of sanitary sewer expansion and installation. To that end, two design scenarios were investigated, an interim and an ultimate design. The pipe capacity or design flows calculated between the nodes are presented in Appendix C (interim) and E (ultimate). Appendices D (interim) and F (ultimate) summarize the proposed trunk lines and their basic design characteristics. City of Oak Park Heights Draft Comprehensive Sanitary Sewer Plan 16 11 1 7 L✓ ' i The alignments shown on the map generally follow the natural drainage of the land to minimize the use of lift stations and consequently provide the City with the most economical ultimate design sanitary sewer system. Minor adjustments in the routing and size of the trunk facilities will take place as determined by the specific land use and development conditions at the time of final design. Any such adjustments are expected to deviate minimally from this plan. lateral network of 8" gravity lines. Each sub - district contains at least one collection point where the sub - district's sewage is defined to enter the pipe network. Upstream of that collection point, unserviced areas can be served by a Lift stations and force mains will be required to service certain areas. Sub - Districts W -11, W -12, W -13, and W -14 will be serviced via lift stations WI ILS and W13LS (WI ILS is under contract for installation in 1999). W13LS has been proposed to provide service to the low -lying area in the western part of Sub - District W -13. Due to the proposed staging of the expansion, an interim lift station, W4LS, has been proposed to service Sub - District W -4. Lift stations W4LS and N20LS can ultimately be eliminated with the completion of the trunk line in the Southern District. Upgrading of station W7LS will be required to accommodate the expansion to the west. The upgrade of W7LS would likely be done in several phases since the increase of wastewater generation from the western sub - districts will also come in phases. One upgrade phase for W7LS must include a 75 -foot extension of the force main to enable it to discharge into a larger pipe and obtain increased capacity. District N -5 is currently serviced via lift station NSLS. It has been anticipated that a conduit would be installed under Hwy. 36 during the proposed Hwy. 36 reconstruction. This would eliminate the need for NSLS. 4.2 Wastewater Flow Projections Currently, all wastewater collected in the City is conveyed to the Stillwater Wastewater Treatment Plant via the MCES Stillwater, Bayport, and Oak Park Heights Interceptors. The interceptors run north from Bayport and south from Stillwater along State Highway 95 to the treatment plant, which is located on the east side of State Highway 95 at approximately Upper 61 Street North. All wastewater generated by the City enters the MCES Interceptor at a point near 59` Street North and State Highway 95 and flows north to the treatment plant —with the exception of Sub - Districts N -1 and N -0; where Sub - District N -1 discharges into the MCES Interceptor north of the treatment plant and flows south and Sub - District N -0 is the MCES Treatment Plant site. City of Oak Park Heights Draft Comprehensive Sanitary Sewer Plan 17 Population and household projections for the City are presented in Table 4.1. These wastewater ' flow projections are presented in Table 2.2 (Tier I information). The total population and residential connection numbers include in -fill development within areas already served by municipal sanitary sewer. h [ ll l C] Table 4.1 MUSA Expansion Area Projections r 1. Estimates based on the Draft Comprehensive Sanitary Sewer Ylan (April, I yyy). 1 4.3 Inter - community Flows There are no flows from Oak Park Heights into any other community's sanitary sewer system. Flows from a small area of Stillwater enter the Oak Park Heights system at node N18.1. The average flow ' from Stillwater into Oak Park Heights is estimated to be 0.003 MGD. 4.4 Individual Sewage Treatment Systems (ISTS) Within the existing City limits, there are approximately eighteen lots that currently have individual ' sewage treatment systems. They are located on the eastern perimeter of Sub - District W -1 along Oakgreen Avenue. This area could eventually be serviced by extending the sewer from Node W 1.1 ' to the south along Oakgreen Avenue. Incidentally, this line may have to be installed to service Sub - District W-4 on an interim basis (see Section 5.3- Additional Special Issues). City of Oak Park Heights ' Draft Comprehensive Sanitary Sewer Plan 18 Average Flow Added (MGD) Sewered Cumulative Year Households S a Average �g e Flow Commercial/Industrial, Added od Households Residential Convenience/Commercial, Total (MGD) Public/Institutional 2000 NA 3,037 NA NA NA 0.337 2005 2,947 5,984 0.560 0.148 0.708 1.044 2010 921 6,905 0.175 0 0.175 2.219 2015 1,115 8,021 0.212 0.076 0.288 2.499 2020 0 8,021 0 0 0 2.499 1. Estimates based on the Draft Comprehensive Sanitary Sewer Ylan (April, I yyy). 1 4.3 Inter - community Flows There are no flows from Oak Park Heights into any other community's sanitary sewer system. Flows from a small area of Stillwater enter the Oak Park Heights system at node N18.1. The average flow ' from Stillwater into Oak Park Heights is estimated to be 0.003 MGD. 4.4 Individual Sewage Treatment Systems (ISTS) Within the existing City limits, there are approximately eighteen lots that currently have individual ' sewage treatment systems. They are located on the eastern perimeter of Sub - District W -1 along Oakgreen Avenue. This area could eventually be serviced by extending the sewer from Node W 1.1 ' to the south along Oakgreen Avenue. Incidentally, this line may have to be installed to service Sub - District W-4 on an interim basis (see Section 5.3- Additional Special Issues). City of Oak Park Heights ' Draft Comprehensive Sanitary Sewer Plan 18 A copy of the Washington County ordinance in regard to Individual Sewage Treatment Systems is provided in Appendix H. 5. Design Options and Recommendations ' 5.1 City of Oak Park Heights Sanitary District 1 I 1 1 1 1 P r, ' I 1 The City of Oak Park Heights Comprehensive Sanitary Sewer Plan encompasses 40 sub - districts covering approximately 3,000 acres. The core of the City, approximately 1,600 acres, is located in the Northern and Western Districts. The currently non - serviced areas are as follows: The 75 -acre Sub - District, W -4, located in the southeastern corner of the Western District will be serviced by 2005. Sub - Districts W -12, W -13 and W -14, located west of State Highway 5, approximately 150 acres, are indicated to be serviced by 2000 on the Concept and Staging Plan. The entire Southern District is designated to be serviced by the City during the period from 2005 through 2015. It is worth noting that Sub - Districts N -0 and N -I do not contribute wastewater into the Oak Park Heights sanitary system and are not included in the design model beyond Appendix B. Sub - District N -0 is the site of the MCES Wastewater Treatment Plant and Sub - District N -1 is serviced via laterals that discharge directly into the Stillwater Interceptor north of the MCES Wastewater Treatment Plant. City of Oak Park Heights Draft Comprehensive Sanitary Sewer Plan f[9 I ' 5.2 Northern Sanitary District ' The Northern District consists of the original core City of Oak Park Heights. The long -term land use is tabulated below. A detailed breakdown is provided in Appendix A. 1 L Table 5.1 Northern Sanitary District Land Use Land use Acres Residential 286 Commercial/Industrial 281 Public / Institutional 256 Parks /Open Space 157 ' Additional Special Issues ' At present, Sub - District District N -5 is serviced via lift station NSLS. The future realignment and reconstruction of the Highway 36 corridor would facilitate the installation of a sanitary trunk that would cross the corridor and discharge into the Stillwater Interceptor just north of the MCES Treatment Plant. This will alleviate the need for NSLS and would remove the flows from Sub- ' District N -5 from entering the main sanitary trunk line starting at Node N -5.3. Lift station N20LS, which services Sub - District N -20 with a future addition of some 75 lots from ' Sub - District W -3, could also be eliminated once the southern trunk is completed up to the SE comer of Sub - District W -4 (Node W4.1). A trunk line would need to be built from Node N20LS to ' Node W4.1 at that time. If street reconstruction occurs in this area prior to the southern trunk being completed, it is recommended that the trunk line to node W.4 be installed in conjunction with the ' street reconstruction. 1 City of Oak Park Heights Draft Comprehensive Sanitary Sewer Plan 20 ' 5.3 Western Sanitary District 1 1 LJ 1 The Western District long -term land use is tabulated below. A detailed breakdown is provided in Appendix A. Table 5.2 Western Sanitary District Land Use Land use Acres Residential 323 Commercial/Industrial 323 Public/ Institutional 114 Parks/Open Space 36 The majority of the wastewater generated in the Western District, with the exception of Sub- ' Districts W -1, W -4, a portion of W -3 and approximately one half of W -2, is lifted via W7LS to the east some 2,800 feet and is discharged into the existing gravity line. Upgrading of lift station ' W7LS will be inevitable to accommodate the expansion to the west. This would likely be done in several phases as the supply of wastewater from the western sub - districts grows with each new development. One upgrade phase for W7LS must include a 75 -foot extension of the force main to enable it to discharge into a 12" gravity line at Node W1.2. Currently, W7LS discharges into an 8 at W2.2. ' Sub - Districts W -11, W -12, W -13 and W -14 will be serviced via lift stations WI ILS and W13LS (W1 ILS is under contract for installation in 1999). W13LS has been proposed to provide service to the low -lying area in the western part of Sub - District W -13. ' Additional Special Issues ' Due to the proposed staging of the expansion, an interim lift station, at node W4.1, has been proposed to service Sub - District W -4. This lift station will pump through a forcemain to Node W1.3 (see Figure M -1 Sanitary Sewer System Map). From there, a gravity line will need to be t installed along Oakgreen Avenue to the north to Node W 1.1. The installation of this line would City of Oak Park Heights ' Draft Comprehensive Sanitary Sewer Plan 21 I 1 also service the lots along Oakgreen Avenue currently using individual sewage treatment systems (also see Section 4.4- ISTS). Lift stations W4.1 and N20LS can ultimately be eliminated with the 1 completion of the trunk line in the southern district. 1 5.4 Southern Sanitary District i 1 1 1 1 1 1 1 1 �J i 1 1 1 The Southern District long -term land use is tabulated below. A detailed breakdown is provided in Appendix A. Table 5.3 Southern Sanitary District Land Use Land use Acres Residential 920 Commercial/Industrial 224 Public/ Institutional 0 Parks /Open Space 29 The Southern District will be serviced via gravity lines extending south from an existing 18" that currently ends at Node NI 1.4 locatedjust northeast of the State Correction Facility. Ultimately, this line will also provide service to Sub - Districts N -20 and W -4 just to the north and west of Sub - District S -2. No lift stations are necessary to service the southern district. City of Oak Park Heights 1 Draft Comprehensive Sanitary Sewer Plan 22 I I I 1 1 I 1 L u I 1 6. Cost Estimates Cost estimates have been prepared for the proposed trunk facilities outlined in this report. The total estimated cost of all proposed trunk facilities shown on the Sanitary Sewer Map is $2,147,000. Trunk facilities include lift stations, force mains, and all gravity lines greater than or equal to 10" in diameter. A breakdown of the cost estimates is presented in the Interim Design Appendices E and F. The cost estimates include construction, design, legal, administration and planning contingency costs, as well as easement acquisition. The planning and contingency costs account for unexpected costs. Examples include route changes by the developer or difficulties in construction such as unexpected bedrock or the requirement of excessive dewatering. Easement costs have been estimated based upon 25 percent of City trunk alignments lying outside future rights of way. Financing costs are not included in this estimate. The phasing of costs for the system is presented in the Interim Design Appendix G. Phase I would occur during the year 2000. Estimated costs for installation of the sanitary service to the western annexation area is $742,000. This includes the installation of two new lift stations, WI ILS and W13LS, and one lift station upgrade, W7LS. Phase lI would occur during the year 2005. Estimated costs for installation of the sanitary sewer service for the southern annexation region is $1,405,000. This includes the $108,000 cost of installation for the lift station and force main to service District W-4. This cost could be eliminated if the southern sanitary trunk line gets installed far enough to the west to service District W-4 by gravity. One additional cost, not listed in Appendix G, is the installation of the trunk to service District N -5. Estimated cost is $34,000. This trunk line would go under Hwy 36. Ideally, the trunk or a suitable conduit could be installed during the proposed Hwy 36 reconstruction. City of Oak Park Heights Draft Comprehensive Sanitary Sewer Plan 23 7. Recommendations ' The Comprehensive Sanitary Sewer Plan presented herein is intended to serve as an inventory of City of Oak Park Heights' existing sanitary sewer trunk facilities and as a guide for expanding the trunk sewer system to service future annexation areas adjacent to the City. Based on the information analyzed in this study and presented in this report, the following recommendations ' are presented for the City's consideration: ' 1) That the City Council adopt the sanitary sewer layout, as presented in the Sanitary Sewer Map, as the development guide for sanitary sewer construction within the study area. ' 2) That the design flows in Appendix D be used for sizing all future sanitary sewer trunk facilities. 3) That the City undertakes a program to clean the trunk sanitary sewer pipes on an ' annual basis. LJ I City of Oak Park Heights Draft Comprehensive Sanitary Sewer Plan 24 = = = m = m m = = = m = = = m m = m m I 1 1 1 1 Appendix A Areas for the Ultimate System I 1 1 1 1 F 1 I 1 1 1 l� r r l I 1 APPENDIX A - AREAS OF SEWER SUBDISMCFS Residen0el Raid eelW Raideadd C.--All Peblk Peek Noe A. Low' Demiry Medium D m Ii 6 Derain Ied.," Ie4liWllnoal Open S"u Dweboebie TOTAL N -1 0 0 1 0 0 0 1 12 9 0 0 0 21 N -2 0 p 1 0 0 0 0 159 29 12 9 206 N -3 200 21 D 0 0 0 30 a 39 1 92 N4 0 0 I 0 0 0 0 I a 39 5 45 N -5 190 32 1 0 0 a 0 0 0 0 0 32 N -SA 60 16 1 0 0 0 2 0 0 0 a I9 N6 19 7 1 0 0 0 9 3 49 0 0 67 N -7 6 0 1 0 0 0 15 21 5 0 0 42 N -9 0 0 0 5 27 3 2 a 0 0 11 N -9 0 0 59 12 0 11 5 1 0 0 30 -10 59 IS 0 0 0 0 0 0 0 0 is N -11 0 0 0 0 0 0 0 169 42 0 21 -12 21 6 0 0 0 0 0 0 0 0 6 -13 140 39 0 0 0 0 0 0 0 0 39 N -14 92 29 0 0 0 0 0 2 0 0 30 N -15 3 2 0 0 0 0 12 0 0 0 14 N -16 0 0 0 0 0 0 31 0 0 0 31 N -17 50 14 0 0 0 0 6 0 4 0 24 N -19 4 2 0 0 0 19 2 a 7 0 29 N -19 0 0 0 0 0 0 0 0 12 0 13 N: ISe 4 0 0 0 0 0 0 4 7 ®aoa000 ®a0000aoom ©o ©o© �aaao��a0a ©o� ®aaaooa0aoo�� ®aaooamoo ©os� �o�aoaaa000© ®a000as000am �aaoaaaoo0o® ®000000m000�a �aoaoa00000® �amaoa00000® �aaaaaoo�oo� ®oaoaoa�ooa� ®mmoa�>_o ®000© ®o�� ®000000© �rr� sfss sr.>• �� �x� sr� sr� �ss� �re� �z� �� se � ®o ®a0000aoom ®amaoaooa ©a® �a�aaaooaoa�� �assaaaomaoa® ®amaaaomaoo® Appendix A I I i j Appendix B I Average Flows (MGD) for the Sewer Districts r I I I I I I I I APPENDIX B - AVERAGE FLOWS FOR SEWER SUBDISTRICTS N -1 0.012 Commercial Public Park Nan 0.044 Area Residential Industrial Institiutional Open Spaer Developable TOTAL Desi nation MGD MGD ) (MGD) MGD M D GD N -1 0.012 U32 0.000 0.000 0.000 0.044 N -2 0.000 0.158 0.042 0.000 0.000 1 0.200 N -3 0.048 0.030 0.000 0.000 0.000 0.078 N-4 0,000 0.001 0.000 0.000 0.000 0.001 N -5 00045 0.000 0.001 0.000 0.000 0.046 N -5A 0.019 0.000 0.000 0.000 0.000 0.019 N-6 0.016 0.003 0.078 0.000 0.000 0 -097 N -7 0.035 0.021 0.008 0.000 0.000 0.065 N -8 0.011 0.002 0.000 0.000 0.000 0.014 N -9 1 0.021 0.005 1 0.002 0.000 0.000 0.027 N -10 0.014 0.000 1 0.000 0.000 1 0.000 0.014 N -11 0.000 0,000 0.039 0.000 1 0.000 0.040 N -12 0.005 0.000 0.000 0.000 0.000 0.005 N -13 0.033 04000 0.000 04000 0.000 0.033 N -14 0,022 0.000 0.003 0.000 0.000 0.025 N -15 0.001 0.022 0.000 0.000 0.000 0.023 N -16 0.000 0.040 0.000 0.000 0.000 0.040 N -17 0.012 0.006 0.000 0.000 0.000 0.018 N -l8 0.040 0.002 0.000 0.000 O.Ow 0.042 N -19 0.000 OMO 0.001 0.000 0.000 0.001 N -20 0.038 0.000 0.000 0.000 0.000 0.038 Subtotal 0.371 0.323 0.174 0.000 0.000 0.869 m........, n:.ti: * W -1 0.000 0.018 0.000 0.000 0.000 0.018 W -IA 0.002 0.009 0.000 0.000 0.000 0.011 W -2 0,000 0.048 0.000 0.000 0.0w 0.048 W -3 0.047 0.000 0.000 0.000 0.000 0.047 W-4 0.068 0.000 0.000 0.000 0.000 0.068 W -5 0.068 0.000 0.000 0.000 0.000 0.068 W-6 0.012 0.000 0.000 0.000 0.000 0.012 W -7 0.000 0.033 0.001 0.000 0.000 0.035 W -8 0.000 0.043 0.000 0.000 0.000 0.043 W -9 0.018 0.000 0.000 1 0.000 1 0.000 0.018 W -10 0.000 1 0.000 0.018 1 0.000 1 0.000 0.018 W -11 0.000 0.058 0.000 0.000 0.000 0.058 W -12 0.015 0.013 0.000 0.000 0.000 0.028 W -13 0.037 0.000 0.000 0.000 0.000 0.037 W -14 0.021 0.016 1 0.004 1 0.000 1 0.000 0.042 Subtotal 0.289 0.239 1 0.023 1 0.000 1 0.000 0.551 S -1 0.040 1 0.000 1 0.000 1 0.000 0.000 1 0.040 S -2 0.333 0.000 1 0.000 0.000 0.000 0.333 S -3 0.397 0.000 0.000 0.000 00000 0.397 S-4 0.053 0.076 1 0.000 0.000 0.000 0.128 S -5 0.035 0.074 0.000 0.000 0.000 0.(09 S-6 0.020 0.074 0.000 0.000 0.000 0.094 Subtotal 0.878 0.224 1 0.000 0.000 0.000 1 1.101 in MMMEWRM Appendix B J L; I I II Appendix C I Design Flows (MGD) for the Interim System I i I 1 I I F, i 1 I I L 0 I I I u I I I I I I l J I I Interim Design APPENDIX C - DESIGN FLOWS FOR THE INTERIM SYSTEM N... h- O .fd.4 Wl.l N18.1 Average Cumulative Peak Peak 2.13 From To Subdistrict Flow Average Flow Waste DESIGN Point Point Added Added Flow Factor Flow FLOW 3.3 2.26 126 GD GD P MGD MGD N... h- O .fd.4 Wl.l N18.1 W -Trunks 0.626 0.626 3.4 2.13 2.13 N18.1 N17.2 N- 18 +N -19 0.043 0.668 3.3 2.21 2.21 N17.2 N17.1 N -17 0.018 0.686 3.3 2.26 126 N17.1 N16.1 0.000 0.686 3.3 2.26 2.26 N16.1 N8.4 N- 16 0.040 0.726 3.3 2.40 2.40 N8.4 N8.3 0.000 0.726 4 2.91 2.91 N8.3 N8.2 N -8 0.014 0.740 3.3 2.44 144 N8.2 N8.1 0.000 0.740 3.3 2.44 2.44 N8.1 N4.3 0.000 0.740 3.3 2.44 2.44 N4.3 N4.2 Junction 0.161 0.902 3.2 2.89 2.89 N4.2 N4.1 N4 0.001 0.902 3.2 2.89 2.89 N4.1 N3.6 Junction 1.306 2.209 2.8 6.18 6.18 N3.6 N3.5 N -3 0.078 2.286 2.8 6.40 6.40 N15 N3.4 Junction 0.065 2.351 2.7 6.35 6.35 N3.4 N3.3 0.000 2.351 2.7 6.35 6.35 N3.3 N3.2 0.000 2.351 2.7 6.35 6.35 N3.2 N3.1 0.000 2.351 2.7 6.35 6.35 N3.1 N2.2 0.000 2.351 2.7 6.35 6.35 N2.2 N2.1 -2 0,200 2.552 2,7 6:8 6,8 NSLS N5.3 N -5 0.046 0.046 4 0.18 0.18 N5.3 I N5.2 N -5A 0.019 0.065 4 0.26 0.26 N5.2 N5.1 0.000 0.065 4 0.26 0.26 N5.1 N3.9 0.000 0.065 4 0.26 0.26 N3.9 N3.8 0.000 0.065 4 0.26 0.26 N3.8 N3.7 0.000 0.065 4 0.26 0.26 N3.7 0.00 0 4 0. 6 0.26 OLS N20.1 N -20 0.03 T.038 4 0.15 0.15 N20.1 N14.6 0.000 0.038 4 0.15 0.15 N14.6 N14.5 0.000 0.038 4 0.15 0.15 N14.5 N14.4 N -14 01025 0.063 4 0.25 0.25 N14.4 N14.3 0.000 0.063 4 0.25 0.25 N14.3 I N141 0.000 0.063 4 1 0.25 1 0.25 N14.2 N14.1 N -13 0.033 0.096 4 0.39 0.39 N14.1 N9.4 x- 12 +N -15 +S4 0.068 0.164 3.9 0.64 0.64 N9.4 N9.3 N -9 0.027 0.192 3.8 0.73 0.73 N93 N9.2 0.000 0.192 3.8 0.73 0.73 N9.2 N9.1 0.000 0.192 3.8 0.73 0.73 N9.1 NI 1.3 N -10 0.014 0.205 3.8 0.78 0.78 N11.3 NI 1.2 0.000 0.205 3.8 0.78 0.78 N11.2 N11.1 0.000 0205 3.8 0.78 0.78 NIl l N41 Junction 1.1 01 1.306 2 Nil 11.5 S -Trunk 1.061 1.061 3.1 3. 9 .29 N11.5 N11.4 0.000 1.061 3.1 3.29 1 3.29 NI 1.4 NI 1.1 N-11 0. 40 1.101 3.1 3.41 1 3.41 1 N6.5 N- 5 4 0.26 0.26 N6.5 N6.4 0.000 0.065 4 0.26 0.26 N6.4 N6.3 0.000 0.065 4 0.26 0.26 N6.3 N6.2 0.000 0.065 4 026 0.26 N6.2 N6.1 N -6 0.097 0.161 3.9 0.63 0.63 N6.1 N4.5 0.000 0.161 3.9 0.63 0.63 N4.5 N4.4 0.000 0.161 3.9 0.63 0.63 N4.4 N4.3 I 1 0.000 0.161 3.9 0.63 0.63 Appendix C I J J I J I J I I L I J I I it LJ APPENDIX C - DESIGN FLOWS FOR THE INTERIM SYSTEM W11.2 Wll.I W -11 Average Cumulative Peak Peak 0.23 From I Subdistrict Flow Avenge Flow Waste DESIGN 1'oim Pnnn Added Added Flow Factor Flow FLOW W8.2 W8.1 GD ) (MGD) (P MGD MGD W11.2 Wll.I W -11 0.058 0.058 4 0.23 0.23 W11.1 W11LS W -14 0.106 0.164 3.9 0.64 0.64 W11LS W8.2 S -3 0.000 0.164 3.9 0.64 0.64 W8.2 W8.1 0.000 0.164 3.9 0.64 0.64 W8.1 W7.2 W -8 0.043 0.207 3.8 0.79 0.79 W7.2 W7.1 W -7 0.035 0.242 3.7 0.89 0.89 W7.1 W7LS Junction 0.117 0.358 3.6 1.29 1.29 W7LS W2.2 S -5 0.000 0.358 3.6 1.29 1.29 W2.2 W2.1 W -2 +W -3 0.095 0.454 3.5 1.59 1.59 W2.1 I W1.2 0.000 0.454 15 1.59 1.59 WL2 Wl.l W -1 0.018 0.471 3.5 1.65 1.65 W5.1 W7.3 W -5 0.068 0.068 4 0.27 0.27 W73 W7 L_ W.6 +W.9 ♦W -10 4 0.4 W13LS W12.1 W -13 0.037 0.037 4 0.15 .15 l - 2 0. 0.064 4 0.26 0.26 W4LS _ &I WIA W -4 0.068 0.0 4 0.11 0.11 WIA W1.3 W -1A 0.011 0.039 4 0.15 0.15 W 1.3 W1.1 0.000 0.039 4 0.15 0.15 S22 4.00 S -2 0.333 0.333 3.6 1.20 1.20 S2.1 3.60 0.000 0.333 3.6 1.20 1.20 53.2 3.20 S -3 0.397 0.730 3.3 2.41 2.41 S3.1 J1.6 0.000 0.730 3.3 2.41 2.41 S6.2 2.40 S -6 0.094 0.824 3.2 2.64 2.64 S6.1 2.00 Junction 0.237 1.061 3.1 3.29 3.29 S4.1 S4 .12 0.128 3. .50 0.50 S5.1 S -5 O. i09 0.237 3.8 0.90 0.90 PEAK FLOW FACTOR TABLE Total Avg. 0.00 4.00 0.12 3.90 0.19 3.80 0.24 3.70 0.30 3.60 0.40 3.50 0.50 3.40 0.65 3.30 0.80 3.20 1.00 3.10 1.20 3.00 1.50 2.90 1.90 2.80 2.30 2.70 2.90 2.60 3.50 2.50 4.20 2.40 5.10 2.30 6.40 2.20 8.00 2.10 10.40 2.00 13.50 1.90 18.00 1.80 30.00 1.70 I Interim Design Appendix C 2 ii I 11 11 Appendix D j Interim Trunk System Design And Capacity M Information I li I I I I 11 I Pj I I i I I i Appendix D i Interim Trunk System Design And Capacity Information t I I I I I H I Pj 1 I II r 6 � i i- A a` MENOMINEE 11181.1 EMISSION III SIMON I mmmmiimi�i :m�v :i�oommmeE�immm E& &�98 @ @ @EEHE��EE�99�96E� &16�E9 �o�ae�E�c�oemooee�oe000mo��o�me�oe A a` MENOMINEE 11181.1 EMISSION III SIMON I N E 5 ryry 3� �3 os 3 a� m h Ilo narna = -nr. 7 C nr.�rn- -nom s --- -- -nxss: o �s C W_ a 9 ' p .y s -J7n. r i`a a 9 L! I I j I Appendix E Design Flows (MGD) for the Ultimate System 1 I I H 1 I LI I i I] 1 APPENDIX E - DESIGN FLOWS FOR THE ULTIMATE SYSTEM W1 N18.1 W- Trucks Average Cumulative Peak 1.70 From To Subdistrict Flow Average Flow DESIGN Point Point Added Added Flow Factor FLOW N17.1 N16.1 MGD MGD MGD P W1 N18.1 W- Trucks 0.485 0.485 1 3.5 1.70 N18.1 NIT2 N- 18 +N -19 0.046 0.531 3.4 1.80 N17.2 N17.1 N -17 0.018 0.549 3.4 1.87 N17.1 N16.1 0.000 0.549 3.4 1.87 N16.1 N8.4 N -16 0.040 0.589 3.4 2.00 N8.4 N8.3 0.000 0.589 4 2.36 N8.3 N8.2 N -8 0.014 0.603 3.4 2.05 N8.2 N8.1 0.000 0.603 3.4 2.05 N8.1 N4.3 0.000 0.603 3.4 2.05 N43 N42 Junction 0.161 0.764 3.3 1 2.52 N42 N41 N4 0.001 0.765 3.3 2.52 N4.1 N3.6 Junction 1.375 2.140 2.8 5.99 N3.6 N3.5 N -3 0.078 2.217 2.8 6.21 N3.5 N3.4 Junction 0.019 2.236 2.8 6.26 N3.4 N3.3 0.000 2.236 2.8 6.26 N3.3 N3.2 0.000 2.236 2.8 6.26 N3.2 N3.1 0.000 2.236 2.8 6.26 N3.1 N2.2 0.000 2.236 2.8 6.26 N2.2 N2.1 -2 0.200 2.437 2.7 6.58 N51-S Nl.I N -5 0.032 0.032 4 0.13 N5.3 N5.2 N -5A 0.019 0.019 4 0.08 N5.2 N5.1 0.000 0.019 4 0.08 N5.1 N3.9 0.000 0.019 4 0.08 N3.9 N3.8 0.000 0.019 4 0.08 N3.8 N3.7 0.000 0.019 4 0.08 N3.7 N3.5 0.000 0.019 4 0.08 N 14.5 N14.4 N -14 0.025 0.025 4 0.10 N14A N14.3 0.000 0.025 4 0.10 N14.3 N14.2 0.000 0.025 4 0.10 N142 N14.1 N -13 0.033 0.058 4 0.23 N14.1 N9.4 N- 12 +N- 15 +S -1 0.068 0.126 3.9 1 0.49 N9.4 N9.3 N -9 0.027 0.154 3.9 1 0.60 N9.3 N9.2 0.000 0.154 3.9 0.60 N9.2 N9.1 0.000 0.154 3.9 0.60 N9.1 N11.3 N -10 0.014 0.167 3.9 0.65 N11.3 N11.2 0.000 0.167 3.9 0.65 N11.2 N11.1 0.000 0.167 3.9 0.65 N11A N4.1 Junction 1.207 1.375 3 4.12 N11.6 NI 1.5 S -Trunk 1.168 1.168 3.1 3.62 NI 1.5 N11.4 0.000 1.168 11 3.62 N11.4 N11.I - 1.207 3 3.62 =N1 5 5 4 0.26 N6.5 N6.4 0.000 0.065 4 0.26 N6.4 N6.3 0.000 0.065 4 0.26 N6.3 N6.2 0.000 0.065 4 0.26 N6.2 N6.1 N -6 0.097 0.161 3.9 0.63 N6.1 N4.5 0.000 0.161 3.9 0.63 N4.5 N4.4 0.000 0.161 3.9 0.63 N4.4 N4.3 0.000 1 0.161 3.9 0.63 -- Ultimate Design Appendix E I I I I LI j I L P I I I I Ultimate Design APPENDIX E - DESIGN FLOWS FOR THE ULTIMATE SYSTEM Western District W11.2 Wll.I W -11 Average Cumulative Peak 0.23 From To Subdistrict Flow Average Flow DESIGN Point Point Added Added Flow Factor FLOW W8.2 W8.1 3.00 GD MGD GD PF Western District W11.2 Wll.I W -11 0.058 0.058 4 0.23 W I L 1 W I ILS W -14, Junction 0.106 0.164 3.9 0.64 W11LS W8.2 S -2 0.000 0.164 3.9 0.64 W8.2 W8.1 3.00 0.000 0.164 3.9 0.64 W8.1 W7.2 W -8 0.043 0.207 3.8 0.79 W7.2 W7.1 W -7 0.035 0.242 3.7 0.89 W7.) W7LS Junction 0.117 0.358 3.6 1.29 W7LS W1.2 Junction 0.000 1,168 0.358 3.6 1.29 W2.2 W2.1 W -2 +W -3 0.095 3.9 0.095 4 0.38 W2.1 W1.2 0.237 0.000 0.095 4 0.38 W1.2 Wl.l W -1 +FM 0.387 0.482 3.5 1.69 W5.1 W7.3 W -5 0.0 8 0. 8 4 0. 7 + - + - W13LS W12.1 W -13 0.037 -- 0.037 4 0.15 W12.1 Wl I W -12 0.028 4 .2 W 1.4 W1.3 12 Lots 0.003 0.003 4 0. t W1.3 Wl.I 0.000 0.003 4 0.01 Southern Diatriet N20LS W4.1 N -20 0.038 0.038 4 0.15 W4.1 S2.2 W -4 0.068 0.106 4 0.43 S2.2 S2.1 S -2 0.333 0.439 3.5 1.54 S2.1 S3.2 3.00 0.000 0.439 3.5 1.54 S3.2 S3.1 S -3 0.397 0.837 3.2 2.68 S3.1 S6.2 230 0.000 0.837 3.2 2.68 S6.2 S6.1 S-6 0.094 0.930 3.2 2.98 S6.1 N11.6 Junction 0.237 1,168 3.1 162 54.1 S5.1 S4 0.12 0.128 3.9 0.50 S5.1 S6.1 S -5 0.109 0.237 3.8 0.90 T��iLi1:Iy:Ty'Zi Total Avg. Flow (MGD) 0.00 PFF 4.00 0,12 3.90 0.19 3.80 0.24 3.70 0.30 3.60 0.40 3.50 0.50 3.40 0.65 3.30 0.80 3.20 1.00 3.10 1.20 3.00 1.50 2.90 1.90 2.80 2.30 2.70 2.90 2.60 3.50 2.50 4.20 2.40 5.10 230 6.40 220 8.00 2.10 10.40 2.00 13.50 1.90 18.00 1.80 30.00 1.70 Appendix E i L 1 1 H Appendix F Ultimate Trunk System Design And Capacity Information 1 I 1 1 Cl I I 1 1 1 I i I 11 I I 11 I i I N a I sRmdBdo.,mn - - Rm aF =F �n 3m - ee0oo0o0 00000 00 0 ee0 000.0000 0 ee oee 0 0 < < < « « < < a « «< < < a < < < 3 3z'z'z 3 3 3 3 z 3 3 33 3 'z 9z� z� mss - maa sse sseanca ^ma A sses -aam x p MU'p m € IZ 10 � o � �� ���d�� � U o»> 1 U C � »b U U V V 4i m W�v A 7 55 5555 � ilW e� W W u3 w w wu�i wW W Ll W �J99 w W wW W mgmoca v� � 2ZCZ m z2 v Z r z „ MR r Fi Zw r L m 'Zz°i Z Z. Z - z 2� <Z •. � :lqiZ zzzzzzz 1 2 - RZ zz ZZO Z2 Z �F�ZZ Z. N a I \at»Jg& - ! ! / } \225529! g )§ )( / § ) \ §\ ) \ lqRl I g In 292»8 : :9 ~ ,a \at»Jg& \ i ) - ! ! / } \225529! g )§ )( / § ) \ §\ ) \ \ i ) I I C I Appendix G Trunk System Cost Estimates 1 11 I I 1 u I C I I j0 �3 � 3 3 yI� 33 o y U F F �V K 3 d a a. 3 11441 U 6 i i 1 1 1 Appendix H 1 Lift Station Cost Estimates 1 i 1 1 [1 1 CJ 1 1 L 1 1 1 APPENDIX H - LIFT STATION COST ESTIMATES Northern Diptzict N20LS 0.15 106 6 Duplex Subm. $60,000 Design Design Estimated Construction Point Flow Flow Size Pump Size Cost MGD m in. Duplex Subm. $ Northern Diptzict N20LS 0.15 106 6 Duplex Subm. $60,000 TOTAL ESTIMATED LIFT STATION CONST. COST $320,000 CONTINGENCIES, DESIGN, ADMIN., INTEREST (35 9 /6) $112,000 TOTAL LIFT STATION COST $432,000 Appendix H 1 W41-S 0.11 77 6 $80,000 Duplex Subm. 4 W7LS 1.29 896 10 $60,000 Duple Subm. 22 W11LS 0.64 444 6 $45,000 Duplex Subm. W13LS 0.15 102 4 $75,000 puplex Subm. TOTAL ESTIMATED LIFT STATION CONST. COST $320,000 CONTINGENCIES, DESIGN, ADMIN., INTEREST (35 9 /6) $112,000 TOTAL LIFT STATION COST $432,000 Appendix H 1 7 L 1 1 Appendix I Phased Cost Estimates [] I I I I I 1 I 1 I' 1 E 5 d r r R y ■ ■ r E 6 0 8 a U e t a x Y O 0 u 0 fs e i L Y a 0 4 h 'a S N Y Y a i, vz 0 u 0 W e i L a a C 8 L H ° nom 6 i� �a t05 I r r-- L 1 Appendix J ' City of Oak Park Heights Ordinance on Sewage ' Disposal Systems 1 1 1 1 1 i 11 1 1 1 I PEH -16 -1999 11:1e CITY OF OPH 305 P. 02/15 AN ORDINANCE REGULATING THE INSTALLATION, CONSTRUCTION, ALTERATION, EXTENSION, REPAIR, AND MAINTENANCE OF INDIVIDUAL SEWAGE DISPOSAL SYSTEMS; REQUIRING PERMITS FOR, AND LICENSING OF PERSONS ENGAGED IN THE CONSTRUCTION THEREOF; PROVIDING FOR INSPECTION; PRESCRIBING PENALTIES; AND ADOPTING BY REFERENCE THE 1969 MINNESOTA INDIVIDUAL SEWAGE DISPOSAL SYSTEM CODE. THE CITY COUNCIL OF THE CITY OF OAK PARK HEIGHTS, WASHINGTON COUNTY, MINNESOTA DOES ORDAIN: 305.01 Definitions The following definitions shall apply in the interpretation and enforcement of this Ordinance. ' A. "Sewage" is any water - carried domestic waste, exclusive of footing and roof drainage, of any residence, industry or commercial establishment, whether treated or untreated, and includes the liquid wastes produced by bathing, laundry and culinary operations, and from toilets and floor drains. Raw sewage is sewage which has not been subjected to any treatment process. C J II 1 B. 'Individual Sewage Disposal System" is a sewage disposal system, other than a public or community system, which receives sewage from an individual establishment. Unless otherwise indicated the word "system" as it appears in this Ordinance means "individual sewage disposal system." C. "Building Drain" is that part of the lowest horizontal piping of a building drainage system which receives the discharge from soil, waste, and other drainage pipes inside the walls of any building and conveys the same to the building sewer. D. "Building Sewer" is that part ofthe horizontal portion of the building drainage system extending from the building drain to its connection with the septic tank and carrying the sewage of but one building. 305.02 Minnesota Code The 1969 edition of the Minnesota Individual Sewage Disposal System Code of Minimum Standards recommended by the Minnesota Department of Health, Appendix E of the Minnesota Plumbing Code, is hereby adopted by reference and made a part of this ordinance as if fully set forth herein. Before publication of this Ordinance, the City Clerk shall mark three (3) copies of this code as official copies and file them in his office for use and examina ' FED -16 -1999 11:19 CITY OF OPH 11 1 [1 1 1 1 P. 03/15 305.03 Licensine No person, film, or corporation shall engage in the business of installing and constructing sewage disposal systems within the City of Oak Park Heights without first obtaining a license to carry on such occupation from the City Council and procuring and posting with the City Clerk a bond in the amount of Two Thousand Five Hundred Dollars ($2,500.00) in favor of the City and the public, conditioned upon the faithful performance of contracts and compliance with this Ordinance. Such license shall be renewable annually and may be revoked or refused renewal by the Council for cause. Any installation, construction, alteration, or repair of a sewage disposal system by a licensee in violation of the provisions of 305.05 of this Ordinance, or refusal on the part of a licensee to correct such defective work performed by such licensee, shall be cause for revocation of or refusal to renew a license. 305.04 Permits A. No person, firm, or corporation shall install, alter, repair, or extend any individual sewage disposal system in the City without first obtaining a permit therefor from the Council or its authorized representative for the specific installation, alteration, repair, or extension; and, at the time of applying for said permit, shall pay a fee as established by Council resolution from time to time. Such permits shall be valid for a period of six (6) months from date of issue. B. Applications for permits shall be made in writing upon printed blanks or forms furnished by the Council and shall be signed by the applicant. C. Each application for a permit shall have thereon the correct legal description of the property on which the proposed installation, alteration, repair, or extension is to take place, and each application for a permit shall be accompanied by a plot plan of the land showing the location of any proposed or existing buildings located on the property with respect to the boundary lines of the property and complete plans of the proposed system with substantiating date, if necessary, attesting to the compliance with the minimum standards of this Ordinance. A complete plan shall include the location, size, and design of all parts of the system to be installed, altered, repaired, or extended. The application shall also show the present or proposed location of water supply facilities and water supply piping, and the name of the person, firm, or corporation who is to install the system, and shall provide such further information as may be required by the Council. 305.D5 Construction Requirements Every individual sewage disposal system installed after the effective date of this Ordinance and every alteration, extension, and repair to any system made after that 2 ' FEB -16 -1999 11:18 CITY OF OPH P.04i15 date shall conform to the standards of the code adopted by reference in 305.02. Any individual sewage disposal system or pertinent part thereof, irrespective of the date ' of original installation, which is not located, constructed, or installed in accordance with items 1 b and 1 c of the code shall be so relocated, reconstructed, or reinstalled as to comply with the standards of those items. 1 FI 11 rl L L� 1 305.06 Administration The City Building Official shall enforce the provisions of this Ordinance. 305.07 Inspection The City Building Official shall make such inspection or inspections as are necessary to dctcaninc compliance; wiai this Ordinance. No part of the system shall be covered until it has been inspected and accepted by the Building Official. It shall be the responsibility of the applicant for the permit to notify the Building Official that the job is ready for inspection or re- inspection and it shall be the duty of the Building Official to make the indicated inspection within forty-eight (48) hours after such notice has been given. It shall be the duty of the owner or occupant of the property to give the Building Official free access to the property, at reasonable times, for the purpose of making such inspections. Upon satisfactory completion and final inspection of the system, the Building Official shall issue to the applicant a certificate of approval. If, upon inspection, the Building Official discovers that any part of the system is not constructed in accordance with the minimum standards provided in this Ordinance, he shall give the applicant written notification describing the defects. The applicant shall pay an additional fee, as established by Council resolution from time to time, for each re- inspection that is necessary. The applicant shall be responsible for the correction or elimination of all defects, and no system shall be placed or replaced in service until all defects have been corrected or eliminated. 305.08 Maintenance A. At least once a year the owner of any septic tank, or his agent, shall measure or arrange for measurement of the depth of sludge and scum in such septic tank. When, as a result of such measurement, the top of the sludge layer in the tank or any compartment of the tank is found to be less than twelve (12) inches below the bottom of the outlet baffle or submerged pipe, or if the bottom of the scum layer is less than three (3) inches above the bottom of the septic tank outlet baffle or submerged pipe, the owner or agent shall arrange for the removal and sanitary disposal of sludge and scum from the tank, provided that such requirement for measuring shall be waived for any septic tank which is cleaned as indicated at least once each calendar year. At least once each year the owner of any system equipped with a distribution box shall arrange for the opening of the distribution box and the removal of any settled solids therein. Such material shall be disposed of to the septic tank or by other means acceptable to the Council. C ' FED -16 -1999 11:19 CITY OF OPH P.05i15 1 1 1l 1 1 1 1 1 1 B. At least once, between May 1 and June 30 of each year, the depth of liquid in each seepage pit shall be measured. When, as a result of such measurement, it is found that the liquid level in the pit is less than one (1) foot below the inlet, a second measurement shall be made eight (S) to twelve (12) hours after the first measurement, during which time no liquid shall be discharged to the seepage pit. If, as a result of the second measurement, it is found that the liquid level in the pit has not lowered at least two (2) feet during the indicated period of time, an additional seepage pit or other acceptable soil absorption system shall be provided. 305.09 Obiectives The objectives of this Ordinance are to provide adequate and safe methods of sewage disposal and to prevent the contamination of any existing or future water supply by any existing or future sewage disposal system. Any system of special, unusual, or new design which will satisfy the stated objectives, may be accepted as complying with this ordinance and any permit granted for the construction, installation, alteration or repair of any such special system shall be subject to such conditions and guarantees as may be stated in the permit 305.10 Penalties Any person, firm, or corporation violating any of the provisions of this Ordinance shall be guilty of a misdemeanor and upon conviction thereof shall be fined in an amount not to exceed Seven Hundred Dollars ($700.00) or imprisoned for not to exceed ninety (90) days, or both. Each day that any violation is continued shall constitute a separate offense. 305.11 Effective Date. This Ordinance shall be in full force and effect from and after its passage and publication as provided by law. CITY OF OAK PARK HEIGHTS Mayor Attest: City Administrator 4