Draft COMPREHENSIVE SEWER PLAN

Transcription

1 Draft COMPREHENSIVE SEWER PLAN Prepared for: City of the Village of Minnetonka Beach, MN Prepared by: Stantec Consulting Services Inc. Project No April 30, 2018

2 DRAFT COMPREHENSIVE SEWER PLAN Table of Contents EXECUTIVE SUMMARY... I 1.0 BACKGROUND INTRODUCTION PHYSICAL SETTING EXISTING SANITARY SEWER SYSTEM FORECASTS SANITARY SEWER DESIGN CRITERIA LAND USE ESTIMATED AVERAGE WASTEWATER FLOWS PEAK FLOW FACTORS SANITARY SEWER SYSTEM GENERAL INTERCOMMUNITY FLOWS INDIVIDUAL SEWAGE TREATMENT SYSTEMS (ISTS) PUBLICLY AND PRIVATELY OWNED WASTEWATER TREATMENT PLANTS SYSTEM DESIGN AND RECOMMENDATIONS INFILTRATION AND INFLOW GENERAL SOURCES AND EXTENT OF I/I GOALS, POLICIES, AND STRATEGIES TO ADDRESS I/I I/I IMPLEMENTATION PLAN I/I COST ESTIMATES I/I FINANCING SUMMARY AND OUTCOMES LIST OF TABLES Table Metropolitan Council City-Wide Projections Table Metropolitan Council Average Wastewater Flow Projections Table 3-1 Areas for the Ultimate Sewer System Table 3-2 Sewer System Design Wastewater Unit Flow Rates Table 3-3 Average Calculated Wastewater Flows Table 4-1 Pipe Capacities Table 4-2 Lift Station Design Capacities Table 4-3 Intercommunity Flows LIST OF FIGURES Figure Location Map

3 DRAFT COMPREHENSIVE SEWER PLAN Figure 1-2 Sanitary Sewer Map Figure 3-1 Future Land Use Map Figure 3-2- Peak Flow Factors LIST OF APPENDICES MARCH 2008 SANITARY SEWER INFILTRATION AND INFLOW REVIEW A.1 MCES WORK PLAN ASSIGNMENT HISTORY... B.2 INTERCOMMUNITY FLOW AGREEMENTS... C.3 SANITARY SEWER ORDINANCE... D.4

4 DRAFT COMPREHENSIVE SEWER PLAN Executive Summary The Minnetonka Beach Comprehensive Sewer Plan (CSP) updates previous sewer planning efforts and describes in detail the City s current sanitary sewer system. The report has been based on the land use and population data provided in Minnetonka Beach s Comprehensive Plan Update. This information is summarized in Sections 2 and 3 of this CSP. Layouts of both the existing and proposed sanitary sewer system are presented on Figure 1-2 in this report. Cost estimates have been provided to establish a basis for meeting the Metropolitan Council s work plan for inflow and infiltration (I/I). The report has been prepared in accordance with the Metropolitan Council s guidelines for local Comprehensive Sewer Plans. All of Minnetonka Beach s sewer system has been constructed and is in good condition. Sewer modeling accompanies this CSP for the City s ultimate conditions. The modeling shows no major capacity issues in the City s existing sewer system. No major sewer upgrades are proposed within the City, only minor improvements are suggested to reduce the I/I that occurs within the City. i

5 DRAFT COMPREHENSIVE SEWER PLAN Background April 30, BACKGROUND 1.1 INTRODUCTION The Metropolitan Land Planning Act (amended 1995) requires local governments to prepare comprehensive plans and submit them to the Metropolitan Council (Met. Council) to determine their consistency with metropolitan system plans. The local comprehensive plan is to include a wastewater plan 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 Plan (CSP) which describes the current and future service needs required from the Metropolitan Council. The Metropolitan Council s 2040 Water Resources Policy Plan (2040 WRPP) outlines requirements for the wastewater plan element of the comprehensive plan as well as the Comprehensive Sewer Plan. For simplicity, the Metropolitan Council has combined the required elements of both plans into a single set of criteria, contained in the 2040 WRPP. This 2018 Minnetonka Beach CSP addresses the criteria of the 2040 WRPP. It provides growth projections, design parameters for the existing sanitary sewer system, proposed improvements to the system, and strategies for addressing excessive infiltration and inflow in the system. The CSP updates previous sewer planning efforts and describes in detail the City s sanitary sewer system to serve projected urban development. 1.2 PHYSICAL SETTING The City of the Village of Minnetonka Beach is a peninsula located in Hennepin County as shown in Figure 1-1. It is surrounded by the City of Orono and the waters of Lake Minnetonka. The terrain in most of Minnetonka Beach can be described as gently rolling with roughly 40 feet of elevation change within the City. \\us1291-f01\workgroup\1938\active\ \reports\technicalreports\ minnetonka_beach_csp_draft.docx 1.1

6 ( $ $ Figure 1-1 The City of the Village of Minnetonka Beach Comprehensive Sewer Plan Location Map City of City of Plymouth Independence City of City of Orono Wayzata City of City of Minnetonka City of Mound Beach Deephaven City of Minnetrista City of Shorewood City of Laketown Minnetonka Twp. City of Chanhassen Metro Highways Counties Minnetonka Beach Lakes and Rivers Streams Cities and Townships Miles 1:127,000 (At Original document size of 11x17) 1 inch = 2 miles Disclaimer: Stantec assumes no responsibility for data supplied inelectronic format. The recipient accepts full responsibility for verifying the accuracy and completeness of the data. The recipient releases Stantec, its officers, employees, consultants and agents, from any and all claims arising in any way from the content or provision of the data Revised: By: TKJohnson V:\1938\active\ \GIS\Projects\ _Location_Map.mxd

7 DRAFT COMPREHENSIVE SEWER PLAN Background April 30, EXISTING SANITARY SEWER SYSTEM The City of the Village of Minnetonka Beach s existing sanitary sewer consists primarily of lateral 8-inch sewer lines. The City s sanitary sewer system is shown in Figure 1-2. Minnetonka Beach s system flows through Met Council Meter M421 at node MB-D and discharges into Met Council interceptor 6-OR-641. According to the Met Council, this interceptor currently has capacity for an average flow of 0.12 MGD, which is adequate to meet the future needs of the City of Minnetonka Beach. Sewage in 6-OR-64 travels via a series of lift stations and force mains around the south side of Lake Minnetonka to the City of Minnetonka, after which it travels by gravity to the Blue Lake wastewater treatment plant (WWTP) in Shakopee. \\us1291-f01\workgroup\1938\active\ \reports\technicalreports\ minnetonka_beach_csp_draft.docx 1.3

8 ( $ $ Figure 1-2 City of the Village of Minnetonka Beach, MN Comprehensive Sewer Plan Sanitary Sewer Map!. Sewer District Collection Point Sanitary Structure ") Lift Station!. Manhole Sanitary Sewer Pipe Forcemain Gravity MCES Interceptor 6-OR-641 Sewer Districts MB-A MB-B MB-C City of City of Long Lake Independence City of City of Minnetrista Orono City of City of Spring Minnetonka Park Beach City of City of Mound Tonka Bay City of Greenwood City of Victoria City of Shorewood City of Wayzata City of Minnetonka City of Deephaven To Orono Parcels City Boundary ,600 2,400 Feet 1:9,600 (At Original document size of 11x17) 1 inch = 800 feet Disclaimer: Stantec assumes no responsibility for data supplied inelectronic format. The recipient accepts full responsibility for verifying the accuracy and completeness of the data. The recipient releases Stantec, its officers, employees, consultants and agents, from any and all claims arising in any way from the content or provision of the data. Revised: By: TKJohnson V:\1938\active\ \GIS\Projects\ _Sewer_Map.mxd

9 DRAFT COMPREHENSIVE SEWER PLAN Forecasts April 30, FORECASTS Table 2-1 presents the Metropolitan Council s projections of population, households, and employees for the City of the Village of Minnetonka Beach from the 2040 Water Resources Policy Plan. Table Metropolitan Council City-Wide Projections Year Population Households Employment The City of the Village of Minnetonka Beach uses the Metropolitan Council s projections as the basis for its sewer planning efforts. The facilities described in this report are designed to serve the City under conditions of ultimate development. It should be noted that the City of the Village of Minnetonka Beach is the most upstream community to the MCES interceptor 6-OR-641. The City s system is fully built-out and designed to accommodate the current and future city-wide projections based off of the table above. Table 2-2 presents projected wastewater flows for the City of the Village of Minnetonka Beach, as provided by the Metropolitan Council. It is assumed that Metropolitan Council average flow projections pertain to Minnetonka Beach only, and not adjacent communities. The limited growth in population and employment makes the overall projected average flows the same through Table Metropolitan Council Average Wastewater Flow Projections Year Minnetonka Beach Projected Average Flow (MGD) Metropolitan Council s 2040 Water Resources Policy Plan \\us1291-f01\workgroup\1938\active\ \reports\technicalreports\ minnetonka_beach_csp_draft.docx 2.5

10 DRAFT COMPREHENSIVE SEWER PLAN Sanitary Sewer Design Criteria April 30, SANITARY SEWER DESIGN CRITERIA 3.1 LAND USE The ultimate land use plan for the City of the Village of Minnetonka Beach served as the basis for the development of the sanitary sewer flow projections and analysis of the system. The Metropolitan Council requires phased-flow projections through This is the proposed land use plan included in the City of the Village of Minnetonka Beach s latest Comprehensive Plan and is shown in Figure 3-1. Based on the ultimate land use plan, total areas in each sewershed were calculated for each land use classification. Table 3.1, below, shows the results of these classifications. Detailed descriptions of the various land uses are found in the City of the Village of Minnetonka Beach Comprehensive Plan. Table 3-1 Areas for the Ultimate Sewer System Area Design in District 1 Land Use Acres City Land 1.69 Country Club Low Density Residential Parks and Open Space ROW Trail 9.71 Vacant 0.15 Wetland 8.7 Total \\us1291-f01\workgroup\1938\active\ \reports\technicalreports\ minnetonka_beach_csp_draft.docx 3.6

11 ( $ $ Figure 3-1 City of the Village of Minnetonka Beach, MN Comprehensive Sewer Plan Future Land Use Parcels Future Land Use 2040 City Land Country Club ROW Trail Vacant Low Density Residential Parks and Open Space Wetland ,300 1,950 Feet 1:7,800 (At Original document size of 11x17) 1 inch = 650 feet City of City of Long Lake Independence City of City of Minnetrista Orono City of City of Spring Minnetonka Park Beach City of City of Mound Tonka Bay City of Greenwood City of Victoria City of Shorewood City of Wayzata City of Minnetonka City of Deephaven Disclaimer: Stantec assumes no responsibility for data supplied inelectronic format. The recipient accepts full responsibility for verifying the accuracy and completeness of the data. The recipient releases Stantec, its officers, employees, consultants and agents, from any and all claims arising in any way from the content or provision of the data. Revised: By: TKJohnson \\Us1291-f01\workgroup\1938\active\ \GIS\Projects\ _Future_Land_Use.mxd

12 DRAFT COMPREHENSIVE SEWER PLAN Sanitary Sewer Design Criteria April 30, ESTIMATED AVERAGE WASTEWATER FLOWS Municipal wastewater is made up of a mixture of domestic wastewater, commercial and industrial wastes, groundwater infiltration, and surface water inflows. With proper design and construction, groundwater infiltration and surface water inflows, Infiltration/Inflow, can be minimized. The flows due to I/I are accounted for in the analysis and design of the sewer system. Predicted average wastewater flows from the City sewershed were determined by applying unit flow rates to each of the five land use categories. The design flow rate for each of these land use categories is presented in Table 3-2. Average calculated wastewater flows for each sewershed are presented in Table 3-3. For all land use categories, unit flow rates peracre were used to generate average flow projections. Assumptions of unit density per acre and population densities for each land use type were based on information from City Planning staff. It was assumed that public parks and the City s golf course would not generate any sewer flows. Estimated daily flows per acre are in accordance with standard engineering practices, knowledge of other communities in the Twin Cities metropolitan area and are based on knowledge of Minnetonka Beach. These rates are generally considered conservative. Table 3-2 Sewer System Design Wastewater Unit Flow Rates Land Use Type Persons/Unit Units/Acre Gal/Acre/Day Residential u/ac 740 Large Lot Residential u/ac 1,080 Local Public Park ,260 Golf Course ,000 Wetland ,000 Table 3-3 Average Calculated Wastewater Flows Area Design Residential Local Park/ Golf Course Wetland Total (MGD) Minnetonka Beach PEAK FLOW FACTORS The sanitary sewer system must be capable of handling the anticipated peak wastewater flow rate including any I/I. The design peak flow rate is expressed as a variable ratio to the average \\us1291-f01\workgroup\1938\active\ \reports\technicalreports\ minnetonka_beach_csp_draft.docx 3.8

13 DRAFT COMPREHENSIVE SEWER PLAN Sanitary Sewer Design Criteria April 30, 2018 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 as a curve in Figure 3-1,and also in tabular form. These values are generally conservative and are 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. The design flow for the sewershed is presented in Appendix C. \\us1291-f01\workgroup\1938\active\ \reports\technicalreports\ minnetonka_beach_csp_draft.docx 3.9

14 DRAFT COMPREHENSIVE SEWER PLAN Sanitary Sewer Design Criteria April 30, 2018 Figure 3-2- Peak Flow Factors \\us1291-f01\workgroup\1938\active\ \reports\technicalreports\ minnetonka_beach_csp_draft.docx 3.10

15 DRAFT COMPREHENSIVE SEWER PLAN Sanitary Sewer System April 30, SANITARY SEWER SYSTEM 4.1 GENERAL The sanitary sewer system layout for the City of Minnetonka Beach is presented in Figure 1-2. This map shows existing sanitary sewers, existing lift stations, force mains, and the collection points for the system analysis. The modeling of the sanitary sewer system was based on the unit rates from Table 3-1 and standard peak flow factors from Figure 3-1. All sanitary sewer located in Minnetonka Beach consists of 8-inch lateral pipes. There are four lift stations located throughout the City. The City s system is organized into three design segments. Each design segment has a node assigned to it. Table 4-1 presents information regarding the sewer connection locations and system design sewer flows. Table 4-1 Pipe Capacities From Point To Point Design Flow (MGD) Existing/ Proposed Pipe Size (in) Length (ft) Slope (%) Inlet Control Outlet Control Capacity Capacity/ Design (cfs) (MGD) (cfs) (MGD) (MGD) Flow MB-A MB-B 0.10 Existing MB-B MB-C (M421) 0.13 MB-C MB-D 0.18 Existing FM Existing FM NA NA NA NA NA NA NA NA NA NA NA NA NA NA Table 4-2 provides lift station design capacities for Minnetonka Beach s four lift stations. All lift Stations in the City are small and have pump capacities between 3 and 5 horsepower. Table 4-2 Lift Station Design Capacities Lift Station Design Flow (MGD) Lift Station Capacity (MGD) LS LS LS LS \\us1291-f01\workgroup\1938\active\ \reports\technicalreports\ minnetonka_beach_csp_draft.docx 4.11

16 DRAFT COMPREHENSIVE SEWER PLAN Sanitary Sewer System April 30, INTERCOMMUNITY FLOWS The City of the Village of Minnetonka Beach has four parcel connected to the sanitary sewer system in Orono. This parcel is in the southwest corner of the City at the border of Minnetonka Beach and Orono on Old Beach Road. Table 4-3 presents the average and peak flows for this connection. Table 4-3 Intercommunity Flows Community Average Design Flow (gal/day) Peak Design Flow (gal/day) Minnetonka Beach to Orono Based on current connections but not future growth 4.3 INDIVIDUAL SEWAGE TREATMENT SYSTEMS (ISTS) There are no individual sewage treatment systems in the City of the Village of Minnetonka Beach. The entire City is connected to the sanitary sewer system. The City is committed to the proper design, location, installation and ongoing maintenance of ISTS. The Minnetonka Beach City Code requires that all new systems be installed according to Minnesota Pollution Control Agency (MPCA) Administrative Rule 7080 permit requirements. Groundwater conditions, soil borings, distance to surface water, percolation tests, and design and type of selected ISTS are further factors included in the developer s site evaluation. Permitting and inspection is provided by Hennepin County. The government ordinance, Hennepin County Ordinance No. 19, went into effect January 1, Ordinance No. 19 adopts the State of Minnesota Rules governing individual sewage treatment systems, MN Rules Chapter Information regarding Hennepin County Ordinance No. 19 can be found on the County s website. 4.4 PUBLICLY AND PRIVATELY OWNED WASTEWATER TREATMENT PLANTS There are no publicly or privately-owned wastewater treatment plants within The Village of the City of Minnetonka Beach. \\us1291-f01\workgroup\1938\active\ \reports\technicalreports\ minnetonka_beach_csp_draft.docx 4.12

17 DRAFT COMPREHENSIVE SEWER PLAN Infiltration and Inflow April 30, SYSTEM DESIGN AND RECOMMENDATIONS The City of the Village of Minnetonka Beach is a fully built-out community. It consists of lateral 8 sanitary pipes that are routed to various lift stations within the City until it enters the MCES interceptor system. All of the pipes within the City were constructed no later than the 1970s using PVC pipe. The current sanitary sewer system has been designed to accommodate the existing and future flows for the City and is fully built-out. There have been recorded excess flows from infiltration and inflow that the City continues to monitor and take corrective actions when necessary. 5.0 INFILTRATION AND INFLOW 5.1 GENERAL In February of 2006, Metropolitan Council instituted its Infiltration/Inflow (I/I) Surcharge Program. The fundamental policy statement summarizing this program is that Metropolitan Council will not provide additional capacity within its interceptor system to serve excessive Inflow and Infiltration. The Council establishes inflow and infiltration thresholds for each community that uses its system. Communities that exceed this threshold are required to eliminate this excess flow within a reasonable timeframe or they will have to pay a surcharge fee SOURCES AND EXTENT OF I/I The Metropolitan Council identified Minnetonka Beach as a community with observed excess I/I in 2005, 2007, 2012, and In response to the observed excess I/I, the City has requested a reduced surcharge rate and to extend the payment period. In March 2008, the City conducted a Sanitary Sewer Infiltration and Inflow Review (attached as Appendix A) to determine potential sources of I/I. The results of the I/I review show that the efforts listed below have reduced the I/I and that continued rehabilitation efforts are needed. The City s proactive program included identifying and correcting I/I, including the following: In 2007, all City catch basins were inspected to verify that none were connected to the sanitary sewer. In 2006, the City conducted sump-pump inspections at each building in the City. Five illegal connections were found and removed from the system. Sewer service connection improvements have been made at two locations. These locations had individual sewage pumps to convey their flow to the City system. One of these leaking pump chambers has been replaced with a new sealed pump tank and the City is intending to replace a second pump tank. Vented manhole covers have been placed to reduce inflow through pick holes, and several manholes were raised to eliminate flow over the covers. \\us1291-f01\workgroup\1938\active\ \reports\technicalreports\ minnetonka_beach_csp_draft.docx 5.13

18 DRAFT COMPREHENSIVE SEWER PLAN Infiltration and Inflow April 30, 2018 The City has grouted several leaking manhole walls to reduce infiltration of groundwater into the structures. The City plans to follow-up on possible sump pump re-connection and provide rigid pipe to permanently remove discharge from sanitary sewer system. In 2014, a $99,600 total I/I work plan amount for the City was computed by the MCES based on an event that occurred on July 13, 2013 at metershed M421 by an exceedance of 0.24 MGD. The City has actively been pursuing I/I reduction for several years and will continue these efforts to reduce the I/I within the City and meet the MCES workplan. As the City continues their pursuit of I/I reduction, potential sources of I/I could include: Groundwater infiltration in low areas around the City. Underground springs that may contribute to groundwater infiltration. Older sewer service connections. Older manholes that are no longer sealed properly. The increasing frequency of high-intensity rain events in the region may contribute inflow in cases where the 100-year high water level is exceeded GOALS, POLICIES, AND STRATEGIES TO ADDRESS I/I The City s goals generally are to identify and prevent I/I from exceeding local and regional system capacity, causing local backups; the City will work to remove I/I from the system to the maximum extent practicable. The City s ordinance addressing sump pumps and rain leaders is provided in Appendix H. Specific strategies include: If necessary, in accordance with the latest design standards, replacing sewer facilities, with watertight pipes and manholes, and watertight castings in flood prone areas. Televising and inspecting sewers and manholes on a regular basis. Performing repairs or rehabilitation of pipes and manholes as needed. Working to identify and disconnect sump pump and roof leader connections to the sanitary sewer system I/I IMPLEMENTATION PLAN Implementation activities and schedules to prevent or eliminate excessive I/I from the system include: Continue televising sanitary sewer, inspecting pipes and manholes, and cleaning sewer mains \\us1291-f01\workgroup\1938\active\ \reports\technicalreports\ minnetonka_beach_csp_draft.docx 5.14

19 DRAFT COMPREHENSIVE SEWER PLAN Summary and Outcomes April 30, 2018 o On an annual basis, a portion of the system is covered Perform specific evaluations of areas with excessive I/I o On an as-needed basis Consider programs to reduce I/I contributions from private property and pursue grant funding from the MCES o Timing to be determined Consider the installation of a SCADA metrics system in each lift station within the City to be able to monitor City sewer flows. o Timing to be determined Monitor MCES metering and work with the MCES to identify and reduce regional I/I contributions to the system o On an ongoing basis I/I COST ESTIMATES In 2014, an I/I workplan, from MCES, totaling $99,600, was assigned to the City. This workplan was introduced due to an excess volume in the MCES Interceptor at metershed M421. As of 2017, the City spent a total of $38,752 to achieve this goal and will continue to plan initiatives that will reduce the City s I/I until they spend the remaining $60,848 that is required as part of the workplan. To achieve the workplan goals, the City plans to spend roughly $10,000 -$15,000 a year. Once the workplan has been completed, the City will continue to monitor, collect data, and pursue projects when necessary to reduce I/I within the City I/I FINANCING The current policy of the City of the Village of Minnetonka Beach is to finance all I/I related projects and studies with the sewer fund and/or general fund. 6.0 SUMMARY AND OUTCOMES The Comprehensive Sanitary Sewer Plan presented herein is intended to serve as an inventory of the City of the Village of Minnetonka Beach s existing sanitary sewer facilities. Based on the information analyzed in this study and presented in this report, the following outcomes are desired: 1. That the Metropolitan Council use its population and flow projections presented in Tables 2-1, 2-2, and 2-3 in determining the appropriate capacity for regional facilities. \\us1291-f01\workgroup\1938\active\ \reports\technicalreports\ minnetonka_beach_csp_draft.docx 6.15

20 DRAFT COMPREHENSIVE SEWER PLAN Summary and Outcomes April 30, That the City Council adopt the sanitary sewer layout, as presented in the Sanitary Sewer System Map, as the development guide for sanitary sewer construction within the study area. \\us1291-f01\workgroup\1938\active\ \reports\technicalreports\ minnetonka_beach_csp_draft.docx 6.16

21 DRAFT COMPREHENSIVE SEWER PLAN Appendix A March 2008 Sanitary SewER Infiltration and Inflow Review April 30, 2018 MARCH 2008 SANITARY SEWER INFILTRATION AND INFLOW REVIEW A.1

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27 DRAFT COMPREHENSIVE SEWER PLAN Appendix B MCES Work Plan Assignment History April 30, 2018 MCES WORK PLAN ASSIGNMENT HISTORY B.2

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67 DRAFT COMPREHENSIVE SEWER PLAN Appendix C Intercommunity flow Agreements April 30, 2018 INTERCOMMUNITY FLOW AGREEMENTS C.3

68 DRAFT COMPREHENSIVE SEWER PLAN Appendix D SANITARY SEWER ORDINANCE April 30, 2018 SANITARY SEWER ORDINANCE D.4

69 Minnetonka Beach City Code Sec. 301 Water & Sewer CHAPTER 3. PUBLIC WORKS AND UTILITIES 301 Water and Sewer (1) Water and Sewer Department. There is hereby established a water and sewer department, which is under the supervision of the City Council. The department is responsible for the management, maintenance, care and operation of the water works and sanitary sewerage system of the city. (2) Use of Water and Sewer System Restricted. No person may make or use any water or sewer service installation connected to the city water or sewer system except pursuant to application and permit as provided in this ordinance. No person may make or use any such installation contrary to the regulatory provisions of this Chapter. (3) Application for Service; Procedure. Application for water or sewer service installation and for water service must be made to the City Clerk on forms prescribed by the City Council and furnished by the City. By signing the application form, the applicant agrees to conform to this Chapter and to rules and regulations that may be established by the City as conditions for the use of water and sewer service. Application for a service installation may be made by the owner of the property to be served or by the owner's agent. (4) Fee or Deposit. At the time of making application, the applicant must pay to the City such fees and/or deposit required for the service installation connection as the City Council may establish by resolution from time to time. When a water service connection has been installed, application for water service may be made either by the owner or the owner's agent or by the tenant or occupant of the premises. (5) Account in Name of Owner. All accounts will be carried in the name of the owner. The owner is liable for water supplied to his or her property whether or not the owner is occupying the property and any charges unpaid shall be a lien upon the property. (6) Bills for Service: Water and sewer service charges are billed together. Bills are to be mailed to the customers at least quarterly and must specify the water consumed and the sewer and water charges in accordance with he rates established by the City Council from time to time. (7) Delinquent Account. All charges for water and sewer service are due on the due date specified by the City Council for the respective account and are delinquent thirty (30) days thereafter. A penalty, as established by the City Council from time to time, shall be added to all delinquent accounts. It is the duty of the City Clerk to endeavor to collect promptly delinquent Section 301 Water & Sewer Page 1 of 2

70 Minnetonka Beach City Code Sec. 301 Water & Sewer accounts. In any case, where satisfactory arrangements for payment have not been made, the City Clerk, may, after the procedural requirements of Section 302 (2) have been complied with, discontinue service to the delinquent customer by shutting off the water at the stop box. When water service to any premises has been discontinued, service may not be restored except upon the payment of all delinquent bills and a restoration fee as may be set by the City Council from time to time. The City may exercise any legal or equitable remedy to collect delinquent accounts including but not limited to certification of the amount to the County Auditor for collection in the same manner as special assessments. Section 301 Water & Sewer Page 2 of 2

71 303 General Sewer Regulations. Minnetonka Beach City Code Sec. 303 General Sewer Regulations (1) Unauthorized Connections. No unauthorized person shall uncover, make any connection with or opening into, use, alter, or disturb any public sewer or appurtenance without first obtaining a permit from the Water and Sewer Department and otherwise complying with the provisions of this section. No person shall willfully injure or destroy or attempt to injure or destroy any public sanitary or storm sewer or any appurtenance thereof, nor shall molest any such sewer or appurtenance or any part thereof by removing the cover of any culvert, flush tank, manhole or other part of said public sewer system without authority so to do. (2) Permit and Bond. A permit for construction of the extension between a building drain and the sewer main stub, herein called the building sewer, and for connecting it to the sewer main stub shall be issued only to a master plumber who has furnished a performance bond in the amount of $2,000 or such other amount as the Council may set by resolution from time to time, conditioned so as to secure compliance by the principal with the provisions of this Code and to further secure the principal's performance of all work undertaken within the City. (3) Liability Insurance. Before undertaking the construction work authorized by the permit, the plumber shall secure and maintain a policy of insurance against damages to property or injury or death to persons. The policy shall indemnify and save harmless the City and its personnel against any claim, damages, or cause of action arising out of the work and from any expenses of defending the same. The property damage insurance coverage shall be in the amount of at least $50, and the public liability damage for injury or death shall be in the amount of at least $100, or such other amounts as the City Council may set by resolution from time to time. Proof of such insurance shall be filed with the City prior to construction work and such policy shall provide that the City shall be notified immediately of any termination or modification of such insurance. If the insurance coverage be inadequate in amount, the master plumber shall indemnify and save harmless the City and its personnel in like manner. (4) Indemnification By Owner. The owner shall bear the costs and expenses incident to the installation and connection of the building sewer. The owner shall indemnify the City for any loss or damage directly or indirectly caused by its installation. To the extent it deems necessary, the City Council shall establish rules and regulations for the proper implementation of these requirements which, when approved by the Council by resolution, shall govern the installation of building sewers and connections. Section 303 General Sewer Regulations Page 1 of 8

72 Minnetonka Beach City Code Sec. 303 General Sewer Regulations (5) Facility. The facility constructed for the purpose of making connection to the municipal sanitary sewer shall be constructed of vitrified Clay Sewer Pipe, Extra Heavy Cast Iron Soil Pipe PVC SDR 35 or ABS-Sch 35 all meeting the current A.S.T.M. specifications. If installed in filled or unstable ground, the facility shall be of cast iron suitable improved bed or cradle as approved by the City Sewer Inspector. Extra Heavy Cast Iron Soil Pipe shall be used when the Sewer line is laid within ten (10) feet from any potable water supply or line. (6) Joints. The joints for all sewer pipe shall be air tight to 2 psi. The City may request air testing at the owner's expense. (7) Size and Slope. The size and slope of said facility shall be subject to the approval of the City Sewer Inspector, but in no event shall the diameter be less than four (4) inches. The slope of such four (4) inch pipe shall not be less than one-eighth (1/8) inch per foot. A slope of one-fourth (1/4) inch per foot shall be used wherever practical. (8) Elevation. Whenever possible, said facility shall be brought to the building at an elevation below the basement floor. The depth shall be sufficient to afford protection from frost. All excavations required for the installation of said facility shall be open trench work unless otherwise approved by the Sewer Inspector. Pipe laying and backfill shall be performed in accordance with A.S.T.M. pertaining to that material. (9) Artificial Lifts. In all buildings in which any building drain is too low to permit gravity flow to the public sewer, sanitary sewage carried by such drains shall be lifted by approved artificial means and discharged to the building sewer. No water operated sewage ejector shall be used. (10) Connection To Public Sewer. The connection of the building sewer into the public sewer shall be made at the "Y" branch designated for that property, if such branch is available at the suitable location Any connection not made at the designated "Y" branch in the main sewer, shall be made only with approval of the City Council. (11) Ventilation. Adequate sewer ventilation, subject to the approval of the City Sewer Inspector, shall be provided in all structures connected to the municipal sanitary sewer. (12) Excavation. All excavations for building sewer installation shall be adequately guarded with barricades and lights and all precautions taken as required by law so as to protect the public from hazard. Section 303 General Sewer Regulations Page 2 of 8

73 Minnetonka Beach City Code Sec. 303 General Sewer Regulations (13) Restoration. Streets, sidewalks, parkways and other public property disturbed in the course of the work shall be restored in a manner satisfactory to the City. (14) Liquid Waste. Grease, oil and sand interceptors shall be provided when necessary for the proper handling of liquid wastes containing grease in excessive amounts or any inflammable wastes, sand and other harmful ingredients; except that such interceptors shall not be required for private living quarters or dwelling units. All such interceptors shall be of a type and capacity approved by the City Engineer, and shall be located so as to be readily and easily accessible for cleaning and inspection. (15) Interceptors: Construction. Grease and oil interceptors shall be constructed of impervious materials capable of withstanding abrupt and extreme changes in temperature. They shall be of substantial construction, water-tight and equipped with easily removable covers which when bolted in place shall be gas-tight and water-tight. (16) Interceptors; Maintenance. Where installed, all grease, oil and sand interceptors shall be maintained by the owner, at the owner's expense, in continuously efficient operation at all times. (17) Private Sewage Disposal Facilities; Abandonment. Upon connection of a facility, any septic tanks, cesspools and similar private sewage disposal facilities shall be abandoned and filled with suitable material. Contents of septic tanks, cesspools, distribution tanks or any similar tanks must be pumped out and hauled away by proper tank trucks; the contents of said septic tanks shall not be emptied into the municipal sanitary sewer (18) Sewer Inspection. A Sewer Inspector shall be appointed by the Council. It shall be the duty of the Inspector to inspect a facility constructed for the purpose of making connection to the municipal sanitary sewer before the excavation therefore is backfilled to determine whether the facility is constructed in conformity with this Code. In the event the Inspector determines that the facility is not so constructed, the Inspector shall prohibit the connection of the facility to the municipal sanitary sewer until such time as alterations necessary to assure conformity are made. The connection of the facility to the municipal sanitary sewer shall be made under the supervision of the Inspector or the Inspector's deputy. Reasonable notice shall be given to the Inspector prior to backfilling of the excavation for the facility and its connection. (A) Inspection Fee. An inspection fee to be determined by action of the City Council from time to time shall be charged for each inspection made under the provisions of Section 303. Section 303 General Sewer Regulations Page 3 of 8

74 Minnetonka Beach City Code Sec. 303 General Sewer Regulations (B) Authorized Entry. After the connection is made, the Inspector and other authorized employees of the City bearing proper identification and credentials shall be permitted to enter all properties for the purpose of inspection, observation, measurement, sampling and testing in accordance with the provisions of Section 303. (19) Use of Municipal Sanitary Sewer; Sump Pumps Prohibited (A) (B) (C) (D) (E) Unpolluted Drainage; General. No person may discharge or cause to be discharged directly or indirectly into the sanitary sewer system any storm water, surface water, ground water, cooling water, roof runoff, or subsurface drainage. No rain spout or other form of surface drainage and no foundation drainage may be connected with any sanitary sewer. Disconnection Required. Any person having a roof drain, sump pump, swimming pool discharge, cistern overflow pipe or surface drain connected to and/or discharging into the sanitary sewer must disconnect and remove all piping or other system conveying such water to the sanitary sewer system. Any disconnects or openings in the sanitary sewer must be closed and repaired in compliance with applicable codes. Sump Pump Discharge; Requirements. All sump pumps must have a discharge pipe installed to the outside wall of the building. The pipe attachment must be a rigid permanent-type pipe such as PVC, copper or galvanized. The discharge must extend at least three (3) feet outside of the foundation and may not be pumped directly or indirectly onto public right-of-way unless approved in advance by the City Compliance; Inspection. Authorized City employees or agents will confirm compliance by inspection as authorized in Section 303 (20). The owner of any property found to be in violation of any provision of this ordinance must make the necessary changes to comply within thirty (30) days of the inspection and compliance will be verified by re-inspection. Violations; Surcharge. A surcharge of $ per month is hereby imposed and will be added to every utility billing for properties not in compliance with Section 303 (19) upon expiration of the thirty (30) day notice period specified in Section 303 (19) (D). The monthly surcharge will be added to every utility billing until the property is in compliance. If, after six months of surcharges for non-compliance, any property is still found to be in Section 303 General Sewer Regulations Page 4 of 8

75 Minnetonka Beach City Code Sec. 303 General Sewer Regulations violation of this ordinance, the surcharge will increase to $300 per month. (F) (G) (H) Violations: Special Assessment. The imposition of the surcharge will not limit the right of the City to seek an injunction in District Court ordering the owner to disconnect or otherwise comply with this ordinance or from pursuing any other legal remedies available; or in the alternative, the City may correct the violation and certify the costs of correction as a special assessment against the property on which the correction was made. Waiver; In General. The City Council may hear and decide requests for waivers from the provisions of Section 303 (19) where strict enforcement would cause undue hardship because of circumstances unique to the individual property under consideration. Any request for waiver must be submitted to the City Clerk in writing. Waiver; Additional Fee. Upon approval of a waiver of compliance with provisions of Section 303 (19), the property owner must agree to pay an additional fee for sanitary sewer services based on the number of gallons discharged into the sanitary sewer system as estimated by the City. (20) Use of Municipal Sanitary Sewer; Waste And Other Prohibited Discharge (A) Prohibited Discharge. No person may discharge or permit to be discharged into any city sewer any of the following wastes: (i) Any liquid or vapor having a temperature higher than 150 degrees Fahrenheit; (ii) (iii) (iv) Any water or waste having a five-day biological oxygen demand exceeding 1,000 parts per million by weight as averaged during any 12-month period; Any gasoline, benzene, naphtha, fuel oil or other flammable or explosive liquid, solid, or gas; Any garbage that has not been properly shredded; (v) Any ashes, cinders, sand, mud, straw, shavings, metal, glass, rags, feathers, tar, plastics, wood, manure, grit, brick, cement, or other solid or viscous matter capable of obstructing the flow in sewers or otherwise interfere with Section 303 General Sewer Regulations Page 5 of 8

76 Minnetonka Beach City Code Sec. 303 General Sewer Regulations the proper operation of the sewers or sewage treatment plant; (vi) (vii) Any water or waste having a ph lower than 5.5 or higher than 9.0 or having any other corrosive property capable of causing damage or hazard to structures, equipment, or personnel of the sewage works; Any water or waste containing a toxic or poisonous substance, whether or not listed as a hazardous waste by any State statute or Rule, in sufficient quantities to constitute a hazard to humans or animals, injure or interfere with sewage treatment, or create any hazard in the receiving waters of the sewage treatment plant; (viii) Any noxious or malodorous gas or substance capable of creating a public nuisance. (B) Discharge Requiring Council Review and Approval. The admission into the municipal sewer of any water or wastes having (1) a 5-day Biochemical Oxygen Demand B.O.D. greater than 500 parts per million by weight, or (2) containing more than 500 parts per million by weight of suspended solids, or (3) containing any quantity of substances having the characteristics described in Section 308(9), or (4) having an average daily flow greater than two percent (2%) of the average daily sewage flow of the municipal sewer system shall be subject to the review and approval of the City Council. B.O.D. shall mean the quantity of oxygen utilized in the biochemical oxidation of organic matter under standard laboratory procedure in five (5) days at 20 degrees centigrade expressed in parts per million by weight. (i) Preliminary Treatment Required. The owner shall provide, at the owner's expense, such preliminary treatment as may be necessary to (1) reduce the B.O.D. to 500 parts per million and the suspended solids to 500 parts per million by weight, or (2) reduce objectionable characteristics or constitutes to within the maximum limits provided for in the preceding paragraph, or (3) control the quantities and rates of discharge of such waters or wastes. Plans, specifications and any other pertinent information relating to proposed preliminary treatment facilities shall be submitted for the approval of the City Council and of the Water Pollution Control Commission of Minnesota, and no construction of Section 303 General Sewer Regulations Page 6 of 8

77 Minnetonka Beach City Code Sec. 303 General Sewer Regulations such facilities shall be commenced until said approvals are obtained in writing. (ii) Preliminary Treatment Facilities; Maintenance. Where preliminary treatment facilities are provided for any waters or wastes, they shall be maintained continuously in satisfactory and effective operation by the owner at the owner's expense. (C) (D) Industrial Wastes. The owner of any property served by a building sewer carrying industrial wastes shall install a suitable control manhole in the building sewer to facilitate observation, sampling and measurement of the wastes. Such manhole, when required, shall be accessible and safely located, and shall be constructed in accordance with plans approved by the Sewer Inspector. The manhole shall be installed by the owner at the owner's expense and shall be maintained by the owner so as to be safe and accessible at all times. Measurements, Tests, Analysis. All measurements, tests and analysis of the characteristics of waters and wastes to which reference is made shall be determined in accordance with methods employed by the Minnesota Department of Health, and shall be determined at the control manhole specified in Section 303 (20) (C) or upon suitable samples taken at said control manhole. In the event that no special manhole has been required, the control shall be considered to be the nearest downstream manhole in the municipal sanitary sewer to the point at which the connection facility is connected. (21) Inspection Authorized. The City Water and Sewer Superintendent and other authorized employees and agents of the City, bearing proper credentials and identification, are permitted at reasonable times to enter upon all properties connected to the sanitary sewer system for the purpose of inspection, observation, measurement, sampling, and testing. (22) Assessment and Charges. (A) Assessment. After the installation and connection have been completed pursuant to Council resolution, the City Clerk shall serve a written notice of the assessment upon the owner or the owner's representative directing the payment of the assessment to the Treasurer within ten (10) days after the service of the notice. If the assessment is not paid within ten (10) days, the City Clerk shall certify the amount to the County Auditor for collection in the same manner as other special assessments. Section 303 General Sewer Regulations Page 7 of 8

78 Minnetonka Beach City Code Sec. 303 General Sewer Regulations (B) Charges. (i) (ii) (iii) Connection. When any premises which for any reason have not been assessed for the construction of the sewer system, are connected to the sewer system, such premises, in addition to the regular connection charge, shall pay an additional connection charge equal to the amount which would have been assessed against said premises for the construction of the sewer system if they had been included in such assessment. Service. The rates due and payable to the City shall be as established from time to time by resolution of the City Council. Information. The owner, occupant or person in charge of any premises shall supply the City with such information as it may reasonably require relating to use of water, use of sewer, or sewer rates. Willful failure to provide such information, willful falsification of such information, or willful failure to comply with any requirement or order issued pursuant to this section constitutes a violation of this Chapter. Section 303 General Sewer Regulations Page 8 of 8