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06-25-18 CC WS Agenda Packet CITY OF SHOREWOOD 5755 COUNTRY CLUB ROAD CITY COUNCIL WORK SESSION COUNCIL CHAMBERS MONDAY, JUNE 25, 2018 6:00 P.M. AGENDA 1. CONVENE CITY COUNCIL WORK SESSION A. Roll Call Mayor Zerby _____ Johnson _____ Labadie _____ Siakel _____ Sundberg _____ B. Review Agenda ATTACHMENTS 2. COMPREHENSIVE PLAN A. NAC NAC Handout Community Facilities Implementation B. WSB WSB Handout Sewer Chapter Water Chapter 3. ADJOURN EXECUTIVE SUMMARY Introduction The City of Shorewood's Comprehensive Sanitary Sewer Plan evaluates the existing sanitary sewer system, projects future wastewater flows, and outlines the timing and sequence of future improvements to accommodate those flows. The Sanitary Sewer Plan allows the City and the Metropolitan Council (MCES) to build and improve their sanitary sewer collection and treatment systems so that development can occur in the most efficient and cost - effective manner. Existing System The City of Shorewood's sanitary sewer system currently consists of approximately 60 miles of sanitary main, fourteen lift stations, and 2.6 miles of forcemain, which were installed from the early 1970's onward. Several of the City's lift stations have not been rehabilitated since the early 1970's. The wastewater flow is measured at eight MCES meters and is discharged to ten MCES interceptors. It is then conveyed through the MCES system to the MCES Blue Lake Wastewater Treatment Plant (WWTP) in the City of Shakopee. Population and Wastewater Flow The City of Shorewood has seen an increasing trend in its population over the last ten years. MCES meter data from the last five years shows that wastewater flow is increasing as well. The average wastewater flow from 2012 -2016 was 0.77 million gallons per day (MGD). Growth and Flow Projections The largest development within Shorewood is the redevelopment of the Minnetonka Country Club site into 142 single - family residential lots, which was approved in 2016. The Metropolitan Council projects that the population of the City will increase by approximately three percent between now and the year 2040. This report projects that the City's average wastewater flow will increase to 0.81 MGD by the year 2040. Proposed Improvements The City trunk gravity sewers (greater than 8 -inch diameter) reviewed in this plan all have adequate capacity through the year 2040. In addition, the City's fourteen lift stations are all projected to have adequate capacity through the year 2040. Therefore, the City's sanitary sewer investments are focused towards maintaining and rehabilitating the existing system. The City has budgeted $70,000 annually for inflow and infiltration (1 /1) reduction projects. The City also plans to rehabilitate Lift Station Nos. 7, 10, and 20 over the next three years. Changes From 2030 Plan In this cycle of Comprehensive Planning, MCES has required greater detail and analysis of lift station and trunk sewer capacity, which this plan provides. They also require greater detail and a stronger commitment regarding 1 /1, so this plan includes more information on 1/1 identification, mitigation, and budgeting. Sanitary sewer improvements remain focused on system maintenance and rehabilitation. Comprehensive Sanitary Sewer Plan City of Shorewood, MN WSB Project No. 2925 -36 TABLE OF CONTENTS INTRODUCTION............................................................................... ..............................1 BACKGROUND............................................................................... ............................... 2 EXISTING SANITARY SEWER SYSTEM ....................................... ............................... 3 Individual Sewage Treatment Systems .................................................... ............................... 4 Community Treatment Systems ............................................................... ............................... 6 FORECASTS................................................................................... ............................... 7 Population............................................................................................... ............................... 8 Projected Wastewater Flows ................................................................... ............................... 8 SANITARY SEWER DESIGN CRITERIA ...................................... ............................... 10 LandUse .................................................................................................. .............................10 Estimated Average Flows — Existing ......................................................... .............................10 Estimated Average Flows — 2040 Build Out .............................................. .............................10 PeakFlow Factors .................................................................................... .............................11 IntercommunityFlows ............................................................................... .............................11 SANITARY SEWER TRUNK RECOMMENDATIONS ................... ............................... 12 MCES Interceptor Facility Forecasts ........................................................ .............................14 INFLOW AND INFILTRATION ...................................................... ............................... 15 General.................................................................................................... .............................15 1/1 Analysis ................................................................................................ .............................16 1/1 Reduction ............................................................................................. .............................17 COST ESTIMATES AND FINANCING .......................................... ............................... 18 SUMMARY AND OUTCOMES ...................................................... ............................... 18 FIGURES Figure 1 Existing Sanitary Sewer System Figure 2 Sanitary Sewer Districts Figure 3 Individual Sewage Treatment Systems (ISTS) Figure 4 MCES Peak Flow Factors Comprehensive Sanitary Sewer Plan City of Shorewood, MN WSB Project No. 2925 -36 TABLE OF CONTENTS INTRODUCTION The City of Shorewood is required to prepare a Comprehensive Plan that aligns with the Metropolitan Council's Metropolitan System Plan every ten years per Minnesota Rule 473.858. The Sanitary Sewer Plan is one component of the Comprehensive Plan. It evaluates the existing sanitary sewer system, projects future wastewater flows, and outlines the timing and sequence of future improvements to accommodate those flows. The Sanitary Sewer Plan allows the City and the Metropolitan Council to build and improve their sanitary sewer collection and treatment systems so that development can occur in the most efficient and cost - effective manner. The City of Shorewood's Sanitary Sewer Plan was developed to align with the Metropolitan Council's Thrive MSP 2040 Water Resources Policy Plan. The Thrive MSP 2040 Plan was approved in May 2015 and outlines regional goals for the wastewater system, including environmental sustainability, water reuse, and water conservation. Additionally, the Thrive MSP 2040 Plan includes population, household, and employment projections, and projected wastewater flows. Despite projected population increases, the Metropolitan Council estimates that sanitary sewer flows from the City of Shorewood will decrease by approximately 5% by the year 2040. This Sanitary Sewer Plan outlines the locations in which the Metropolitan Council can expect to see changes in wastewater flows, allowing the Council to determine if capacity upgrades will be required at regional wastewater treatment plants and interceptors. This plan also serves as a guiding document for City infrastructure improvements and expansion. Comprehensive Sanitary Sewer Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 1 BACKGROUND The City of Shorewood is located in western Hennepin County on the southern shores of Lake Minnetonka. Clockwise beginning to the north, the City of Shorewood is bordered by the Cities of Tonka Bay, Excelsior, Greenwood, Deephaven, Minnetonka, Chanhassen, Victoria, Minnetrista, Mound, and Orono. The City of Shorewood is primarily residential with some commercial and public land, and approximately 60 percent of the City is covered by lakes, wetlands, and floodplains. Shorewood has been designated entirely as a suburban community. This designation indicates that the City experienced continued growth over the last thirty years. The Metropolitan Council expects suburban communities to, "plan for forecasted population and household growth at average densities of at least 5 units per acre ... and to target opportunities for more intensive development near regional transit investments." The City's sanitary sewer system was first installed in the early 1970's. Capacity limitations in the Metropolitan Council Environmental Services (MCES) sewer system created service issues for Shorewood in the mid 1980's, but improvements to the regional interceptor system resolved those issues. Today, Shorewood is fully built -out and is served completely by the municipal sanitary sewer system. Given that no further expansion of the system is required, the City currently focuses on system maintenance and upgrades. Comprehensive Sanitary Sewer Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 2 EXISTING SANITARY SEWER SYSTEM The City of Shorewood's existing sanitary sewer system collects and conveys wastewater to ten MCES interceptors and eight MCES meters. It includes fourteen local lift stations, which are summarized in Table 1. In this report, the system has been divided into service areas based on the receiving lift stations and MCES interceptors. A map of the existing sanitary sewer system is shown in Figure 1, and a map of the service areas is shown in Figure 2. Table 1. Existing Lift Station Summary Lift Station No. 5 Lift Station Location Edgewood Road Year Constructed 1970 Year Rehabilitated 2012 Pumping Capacity .. 250 6 Smithtown Road 1972 2012 90 7 Woodside Road 1972 - 90 8 Birch Bluff Road 1972 2004 250 9 Minnetonka Boulevard 1972 - 92 10 Lakeway Terrace 1972 - 150 11 Radisson Road 1972 - 200 12 Christmas Lake Point 1972 2007 95 13 Radisson Entrance 1972 - 30 15 Enchanted Lane 1973 2010 135 16 Shady Island Road 1973 2008 110 17 Shady Island Circle 1973 - 100 18 Shady Island Point 1973 2004 110 20 Noble Road 1994 - 80 All wastewater collected in the City of Shorewood is conveyed through the MCES system to the MCES Blue Lake Wastewater Treatment Plant (WWTP) in the City of Shakopee. The Blue Lake WWTP has a capacity of 38 MGD, provides primary and secondary treatment, and discharges treated effluent to the Minnesota River. Comprehensive Sanitary Sewer Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 3 CITY OF SHOREWOOD Shorewood - _ ------------ Comprehensive Sanitary LS 9 Sewer Plan ' � o Bay , �x LS 1'0% Wi�lan� _ ----------- ® I- ---- _ _ Figure 1: Existing Sanitary LS 18 j ; Sewer System ® LS 17 j Hooper LS 6® j Lake ® j % J LS 15 LS 8 �� i [a NESam St. Albans B Mats ® Edgewood Rd 4 ?°, Excelsior Bay City Boundary �LS 20 M420 � L -S 13 L U 1 ®me ® S MCES Meter ® LS-7 � ?Y4'1 7 i ke L•S 14 Lift Station ® J R d t I 00+ 19t Mud i �j' ® _® LS 12 °hh 91`0 Forcemain $tniti °Wn Lake ® 'Q9 M416 Smithtown d Colle e g Lakr7 - City Owned a- �LS 4 L � Lake e i ® i Galpin —_ % �r t t MCES Owned .�Ca,AA o ne iLake �s��HxESO.a � Gravity )/ Sewer LS 6 LS 2 M439 s City Main -- - - ® - - - - -- ------ -- - ------ -- - - ► MCES Interceptor Smithtown [snxxesu.n Bay ke Vu .inia N A 0 2,500 WSB Feet 1 inch = 2,500 feet - Document Path: K:\02925-360\GIS\Maps\VVater - VVastewater\SanitarVSewer Existin —d! Date Saved: 2/27/2018 9:47:11 AM i CITY OF Carman SHOREWOOD Bay Shorewood Comprehensive Sanitary - - - - -- Sewer Plan Figure 2: Sanitary 9. 2 willilat Sewer Districts Hooper Lake 33 I �� 116 ' �ti� ay %� ; rsOOO O.al - -J City Boundary MCES Meter MCES Meter M412 - w —r— '. s� i ; 30 St. Babans ; Lift Station M415 Edgewood Rd -'�� ! /�\ \\ Y s ( d Forcemain M416 �qt® 23'�/� =3 ' ®�� I � ran o �— City Owned M417 5 il� i 1 -- ke _ $ _ _ 21 X24' �d� ,% lg _ - I t t MCES Owned M420 _ -Rd ��- s� Mud ' 1�2i� 0'o �l_® Gravity Sewer M424 thtown SR11thtOWt� Lake J College T : Rcy —► City Main M439 - - -- sm ,d_ �� 20 ,' v 2 , ar Y Lake 22 � LakP7 j �� r ® Galpin_\ _ ake , !$4 �� 32 _ MCES M455 Interceptor - - Sewer Sub - I I !� I I �e i- ovsto I �e�� I 26 [snxxESO.n 1 , 3 �- �- - - - District 4 1261 27 1 VRIINNESOTA �ESO.a 17 N A 0 2,500 WSB A Feet 1 inch = 2,500 feet - Document Path: K: \02925- 360 \GIS \Ma s \Water - Wastewater \Sanita Sewer Districts —c! Date Saved: 5/7/2018 11:32:58 AM Individual Sewage Treatment Systems The City of Shorewood requires that all new development connect to the sanitary sewer system and prohibits the installation of new individual sewage treatment systems (ISTS), or septic systems. The only ISTS that remain in use are located at 6185 Mill Street, 26750 Smithtown Road, and on Gale Island and Spray Island, which are not served by the public system. These locations are shown in Figure 3. The section of Shorewood City Code regarding ISTS, Chapter 904: Sewer Code, is consistent with Minnesota Pollution Control Agency (MPCA) regulations (Minnesota Rules Chapters 7080 - 7083). The provisions, excerpted below, specify connection to the public sewer and abandonment of ISTS. Subd. 3. Connection to public sewer, abandonment of systems. a. The owners of all houses, buildings or properties which abut upon or are served by a public sewer and where cesspools and septic tanks have been in existence prior to the construction of the sanitary sewer shall connect with the public sewer when public sewer becomes available to the property. Shoreland property shall be further governed by Minn. Rules § 6120.3400. Any septic tanks and cesspools and private sewage disposal facilities then existing shall be abandoned and filled with suitable material. b. At the time as a public sewer becomes available to a property served by a private sewage disposal system, as provided in § 904.05 of this chapter, a direct connection shall be made to the public sewer in compliance with this chapter. Any septic tanks, cesspools and similar private sewage disposal facilities then existing shall be abandoned and filled with suitable material. Community Treatment Systems There are no public or private community treatment systems within the City of Shorewood. All of the properties within the City are served by the public collection system or by individual sewage treatment systems, as described above. Comprehensive Sanitary Sewer Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 6 CITY OF SHOREWOOD Shorewood ------------ Comprehensive Sanitary o Bay William _ Sewer Plan Figure 3: Individual Sewage -� . ------- Q Treatment Systems (ISTS) j Hooper I Lake / A J Edgewood Rd O 4 ? Excelsior ,� Bay o man ke o 0+ Qom, o° ISTS -� - City Boundary (— Smithtown Rd wn_ _ , Iti1t0- Lake Sm � College g Lak Mary Lake _ I Galke eke Es��HxESO.a �-� � h V , xr Ca,AA o�sto ne .yep � 69 -7, , —I r L u WE— o 07 17 N - 0 2,500 WSB Feet 1 inch = 2,500 feet - Document Path: K:\02925-360\GIS\Maps\VVater - VVastewater\SanitarySewer ISTS.mxd Date Saved: 5/7/2018 11:24:47 AM FORECASTS Population The Metropolitan Council publishes population and sewer usage forecasts for each city in the Metropolitan Area. These forecasts help cities prepare infrastructure for growth and promote continued maintenance of municipal infrastructure. The forecast data in Table 2 is from the Metropolitan Council's Local Planning Handbook Community Page for Shorewood. Nearly the entire population of Shorewood is served by the public sanitary sewer system, save the few ISTS described previously. For the purposes of this analysis, it was assumed that the entire population is sewered. Table 2. Population Projections Total (Entirely Sewered) 2020 Households 157 Year Population Households Employment 2010 7,307 2,658 1,113 2020 7,400 2,800 1,300 2030 7,500 2,910 1,340 2040 7,600 3,000 1,400 Population, households, and employment are all projected to increase gradually over the next few decades. The population of the City is projected to increase by approximately three percent between now and the year 2040. Estimates of which MCES Meters and Interceptors can expect to see growth and an increase in sanitary flow, based on existing land use and the areas of the City that are expected to develop or redevelop, are shown in Table 3. Table 3. Household and Employment Projections by MCES Meter & Interceptor Meter Interceptor M412 7016 2020 Households 157 Employment 322 2030 Households 157 Employment 330 Households 157 -0 Employment 339 7017 1,144 275 1,162 284 1,178 301 7017 -1 271 589 339 592 388 601 M415 7017 -2 117 34 122 41 127 54 7017 -3 223 11 228 22 233 33 7017 -4 52 0 53 0 54 0 M416 6 -GW -649 94 0 95 0 97 0 M417 7017 41 46 43 48 45 49 M420 7017 15 0 15 0 15 0 M424 6 -DH -645 138 0 140 0 143 0 6- DH -645A 168 0 170 0 172 0 M439 7017 290 23 294 23 297 23 M455 6 -MT -647 90 0 92 0 94 0 Total 2,800 1,300 2,910 1,340 3,000 1,400 Comprehensive Sanitary Sewer Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 8 Projected Wastewater Flows The wastewater flow from the City of Shorewood is treated at the Blue Lake WWTP. Table 4 lists projected total average wastewater flow from Shorewood to the Blue Lake WWTP, as estimated by this Sanitary Sewer Plan and by the MCES Water Resources Policy Plan (WRPP) Note that the projections used in this report, based on MCES meter data and unmetered flow estimates, are slightly different from the flows projected in the WRPP. Table 4. Total Wastewater Projections Sanitary Sewer Plan 1 0.77 1 0.79 1 0.81 MCES WRPP 1 0.93 1 0.91 1 0.89 1 Comprehensive Sanitary Sewer Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 9 SANITARY SEWER DESIGN CRITERIA Land Use Detailed information and figures regarding Shorewood's land use are included in the City's 2040 Comprehensive Land Use Plan. The City's existing and 2040 land use maps were used in the development of this plan. Using existing land use, metering data, and future land use information, current and future flows were calculated and divided by meter service area as described below. This analysis considered the land use designations listed in Table 5. The largest development within Shorewood is the redevelopment of the Minnetonka Country Club site into 142 single - family residential lots, which was approved in 2016. Estimated Average Flows — Existing The existing wastewater flows within the City were estimated based on a combination of MCES meter data and land use designations. The MCES meter data provides flow rates for broad metersheds within the City. Flow rates for the smaller sanitary sewer sub - districts and lift station service areas were estimated by calibrating flow estimates based on land use designations and acreages with the MCES meter data. Estimated Average Flows — 2040 Build Out Once existing flows were estimated, future flows were projected based on the planned 2040 land use from the Land Use Plan. Parcels that are planned to be developed were assigned wastewater flow rates in accordance to their land use type. Table 5 lists the assigned flows, which include design considerations for inflow and infiltration (1 /1). The Inflow and Infiltration section of this report provides more information about 1/1 as it relates to Shorewood's sanitary sewer system. Table 5. Assumed Wastewater Flow by Land Use Type Land Use Minimum Density Residential Daily Flow (gallons/acre) 99 Low Density Residential 270 Low to Medium Density Residential 450 Medium Density Residential 810 High Density Residential 1,440 Public /Institutional 600 Commercial 800 Office 800 Industrial and Utility 800 Park 0 Future flows were added to existing flows to determine if existing pipe capacities will be sufficient. In locations in which development will lead to pipes that are under capacity, recommendations are made to address the issue. Comprehensive Sanitary Sewer Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 10 Peak Flow Factors To ensure that the sanitary sewer system is capable of handling flow fluctuations throughout the day, peak flows are calculated using peak factors based on average flows. The peak factors are provided by the Metropolitan Council and scale based on average flows. Pipes that serve small generator customers are more likely to experience large fluctuations in flows. Therefore, the peak factor decreases as average flow increases. The Metropolitan Council peak flow factors for sanitary sewer design used in this report are shown in Figure 4 below. Note that historical peak factors calculated from MCES meter data, as available, are used in lieu of the standard peak factors to calculate existing peak flows. 4.0 3.5 3.0 0 LL 2.5 c 2.0 LL 1.5 d a y 1.0 w � 0.5 As Figure 4. MCES Peak Factors for Sanitary Sewer Design 0 5 10 15 20 25 30 Average Flow (MGD) Intercommunity Flows The City of Shorewood has several intercommunity flows, as listed in Table 6 and indicated previously in Figure 2. Table 6. Intercommunity Flows Shorewood Inflow to From Metershed Chanhassen M415 Outflow from To Minnetrista Shorewood Metershed M455 Greenwood M424 Victoria M439 Tonka Bay M420 Excelsior M417 Greenwood M416 Deephaven M424 Minnetonka M412 Comprehensive Sanitary Sewer Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 11 SANITARY SEWER TRUNK RECOMMENDATIONS The firm capacity, existing flow, projected flow, and projected residual capacity for each of the City's lift stations are listed in Table 7. The existing wastewater flows were estimated based on metering and billing data from MCES for 2012 -2016 and the land use designations within each lift station's service area. The increase in projected flows was estimated based on the land use designations of areas that are expected to develop or redevelop by 2040. Standard MCES peak factors for sanitary sewer design were used to calculate peak flows, except for those lift stations located within metershed M415, where a historical peak factor calculated from MCES meter data was used to calculate existing peak flows. The standard peak factors were applied to calculate all 2040 peak flows. Table 7. Lift Station Capacity Analysis LS No. 5 Lift Station Location Edgewood Rd Firm .. .. 250 Existing .. 28.6 Existing .. 192 28.6 137 -� Residual Capacity .. 113 6 Smithtown Rd 90 7.8 32 7.8 32 58 7 Woodside Ln 90 5.5 31 5.5 22 68 8 Birch Bluff Rd 250 5.7 33 5.8 24 226 9 Minnetonka Blvd 92 1.3 5.4 1.3 5.4 87 10 Lakeway Terrace 150 7.8 32 8.3 34 116 11 Radisson Rd 200 8.4 60 8.4 44 156 12 Christmas Lake Point 95 2.2 13 2.2 9.0 86 13 Radisson Entrance 30 0.1 0.7 0.2 0.8 29 15 Enchanted Ln 135 7.2 43 7.2 43 92 16 Shady Island Rd 110 0.8 14 0.8 14 96 17 Shady Island Cr 100 1.2 4.9 1.2 4.9 95 18 Shady Island Point 110 1.3 5.2 1.3 5.2 105 20 Noble Rd 80 1.9 11 1.9 7.7 72 Comprehensive Sanitary Sewer Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 12 Table 8 lists the capacity, existing wastewater flow, 2040 projected flow, and residual capacity of the City's trunk sewers. Trunk sewers were identified based on the sewer mains that convey the majority of the wastewater flow generated in each metershed. Peak factors utilized to calculate peak flows are based on the recommended MCES factors displayed in Figure 3. This report does not analyze the capacity of the MCES interceptor sewers that pass through the City of Shorewood. Table 8. Trunk Sewer Capacity Analysis As seen in Table 7 and Table 8, upgrades to the existing list stations and trunk sewers will not be required to provide service through the specified planning period. Additionally, no new trunk sewers and lift stations will be needed. Lateral sewers may be extended as development or redevelopment occur. Comprehensive Sanitary Sewer Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 13 MCES Interceptor Facility Forecasts The MCES interceptors used by each meter service area, as well as the 2040 forecasted flow to those interceptors, are listed in Table 9. Note that the total flow listed may not correspond to the flow at every point along the interceptor, as the flow may accumulate along the interceptor path through the metershed. Also, note that the flow listed is only the flow generated in Shorewood and does not include any flows from neighboring communities that may also discharge into the metershed. Table 9. Projected 2040 MCES Interceptor Use M M412 Interceptor 7016 -0 Average Flow (MGD) 0.050 -0 Peak Flow (MGD) 0.202 M415 7017 0.319 1.149 7017 -1 0.119 0.463 7017 -2 0.031 0.124 7017 -3 0.061 0.245 7017 -4 0.014 0.054 M416 6 -GW -649 0.023 0.092 M417 7017 0.020 0.079 M420 7017 0.002 0.009 M424 6 -DH -645 0.036 0.143 6- DH -645A 0.042 0.167 M439 7017 0.081 0.324 M455 6 -MT -647 0.015 0.061 Comprehensive Sanitary Sewer Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 14 INFLOW AND INFILTRATION General Inflow is water, typically stormwater, which enters the sewer system through broken manhole covers, sewer cleanouts, sump pumps, foundation drains, and rain leaders. Infiltration is water, typically groundwater, which leaks into the sewer system through cracks in the sewer mains, laterals, joints, and manholes. Water from inflow and infiltration (1 /1) can consume available capacity in the wastewater collection system and increase the flow into treatment facilities. In extreme cases, the added flow can cause bypasses or overflows of raw wastewater. This extra flow also requires a larger capacity in the city's collection and treatment components, which results in increased capital, operation and maintenance, and replacement costs. As a sewer system ages and deteriorates, 1/1 can become an increasing burden on a City's system. Therefore, it is imperative that 1/1 be reduced whenever it is cost effective to do so. In 2006, the MCES began an Ongoing 1/1 Program which requires communities within their service area to eliminate excessive 1 /1. The MCES establishes annual 1/1 goals for each community discharging wastewater into the Metropolitan Disposal System (MDS) based on average daily flows, adjustments for community growth, and 1/1 mitigation peaking factors. Flow metering data is available for the metersheds within Shorewood, and an analysis of this data as it relates to 1/1 is presented on the following page. The City completed a three -year 1/1 reduction program in the early 1990's which included the televising, sealing, and repair of older sections of the system located in wet soils. In the 1990's, the City also began an aggressive sump pump inspection program to eliminate the discharge of stormwater from private properties to the sanitary sewer system. In the 2000's and 2010's, several segments of the sanitary sewer system were rehabilitated or replaced as part of the City's regular street and utility improvement projects, as described in Table 11. The City's existing strategies, programs, investments, and goals for reducing 1/1 are listed in this section. Comprehensive Sanitary Sewer Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 15 1/1 Analysis Shorewood's sanitary sewer system currently consists of approximately 60 miles of sanitary main, fourteen lift stations, and 2.6 miles of forcemain, which were installed from the early 1970's onward. Those lift stations that have not been rehabilitated since the early 1970's (see Table 1), and the surrounding sanitary sewers, are more susceptible to 1 /1. An estimated 29% of the residential housing within the City was built before 1970. Of the pre -1970 era private services, none have been evaluated for 1/1 aside from the sump pump inspections mentioned previously. The amount of clearwater flow generated within the City was estimated by calculating the average annual and peak quarter 1/1 rates, equal to the average wastewater flow minus the base wastewater flow, using data from 2012 -2016. The average flow, both annual and quarterly, was calculated from MCES meter data. Because much of the wastewater flow in the City of Shorewood is unmetered, the finest time scale for which flow estimates are available is quarterly. The peak quarter flow was determined for each year from 2012 -2016, and then those peak quarter flows were averaged to give the value listed in Table 10. The base flow was approximated as the winter water usage, which was calculated as the average water pumped in December through February from 2012 -2016 times a historical ratio of water used to water pumped (presented as Total Water Delivered divided by Total Water Pumped in the City's Water Supply Plan). Because the City has two separate water systems, West and East, a separate 1/1 estimate was made for each system based on the corresponding sanitary sewer districts. Table 10. 1/1 Estimate Average Annual Flow (MGD) West System 0.207 East System 0.161 Peak Quarter Flow (MGD) 0.245 0.195 Base Sanitary Flow (MGD) 0.101 0.129 Average Annual 1/1 Rate (MGD ( %)) 0.106(51%) 0.032 (20 %) Peak Quarter 1/1 Rate (MGD ( %)) 0.144(59%) 0.066(34%) Comprehensive Sanitary Sewer Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 16 1/1 Reduction The City's strategy for preventing excess 1/1 includes requiring all development to conform to City standards. City code prohibiting the discharge of storm water to the sanitary sewer system and requiring the disconnection of existing 1/1 sources is excerpted below. 904.09 PROHIBITED DISCHARGES INTO THE SANITARY SEWER SYSTEM. Subd. 1. Prohibited connections. No person shall discharge or cause to be discharged, directly or indirectly, any storm water, surface water, ground water, roof runoff, subsurface drainage or cooling water to any sanitary sewer. Any person having a roof drain, sump pump, unauthorized swimming pool discharge, cistern overflow pipe or surface drain connected and /or discharging into the sanitary sewer shall disconnect and remove any piping or system conveying the water to the sanitary sewer system. In addition, the City has routine activities directed at recognizing and correcting 1 /1. The City's annual Street Improvement Projects include sewer televising, chimney seal installation, pipe lining, and manhole grouting. Some of the specific projects completed by the City of Shorewood to reduce 1/1 are shown in Table 11. The costs listed only include sanitary sewer improvements. Table 11. 1/1 Activities Completed The City of Shorewood will continue to proactively identify 1/1 sources and take corrective actions. The City has budgeted $70,000 annually for 1/1 reduction projects in addition to its other sanitary sewer improvement projects. The rehabilitation that has been completed to date has resulted in a reduction of 1 /1. However, the remaining 1/1 continues to be a concern and is being addressed by the City. Comprehensive Sanitary Sewer Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 17 2007 Wedgewood Dr, Teal Cir, Mallard Ln Improvements $7,369 2009 Reconstruction of Lift Station 16 $85,594 2010 Smithtown Ln, Harding Ln, Harding Ave Rehabilitation $5,014 2014 Utility & Street Improvements — Sunnyvale Ln $66,413 2014 Mill and Overlay Improvement Project (chimney seals) $4,375 2015 Mill and Overlay Improvement Project (chimney seals) $4,288 2015 Star Ln, Star Cir Improvements $14,026 2016 Mill and Overlay Improvement Project (chimney seals) $4,950 The City of Shorewood will continue to proactively identify 1/1 sources and take corrective actions. The City has budgeted $70,000 annually for 1/1 reduction projects in addition to its other sanitary sewer improvement projects. The rehabilitation that has been completed to date has resulted in a reduction of 1 /1. However, the remaining 1/1 continues to be a concern and is being addressed by the City. Comprehensive Sanitary Sewer Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 17 COST ESTIMATES AND FINANCING Table 12 lists the proposed capital improvements and their estimated costs. Because the City of Shorewood sanitary sewer system is largely built out, the capital improvements consist of maintaining and rehabilitating the existing system. Table 12. Capital Improvements by Metershed SUMMARY AND OUTCOMES The analysis provided in this Sanitary Sewer Plan is aimed to provide the City of Shorewood and the Metropolitan Council assistance in planning for wastewater collection and treatment. The City anticipates that the design flows and criteria outlined will be used for utility planning as development continues. Tables and figures can be utilized to create budget -level estimates and schematic representations of infrastructure improvements, with specific sizing and routing to be determined during the design phase. Comprehensive Sanitary Sewer Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 18 EXECUTIVE SUMMARY Introduction The City of Shorewood's Comprehensive Water Plan describes the City's existing water distribution system and water demand, projects future water demand through the year 2040, and proposes infrastructure improvements to accommodate that demand. This Plan has been prepared according to the guidelines established by the Metropolitan Council and the Minnesota Department of Natural Resources (DNR). The Water Supply Plan that will be attached to this report follows a template provided by the DNR, while this Comprehensive Water Supply Plan expands upon the template for City and Metropolitan Council planning. Existing System The City of Shorewood's water distribution system provides approximately 145 million gallons of water each year to nearly 1,500 service connections. The overall system is composed of several separate water distribution systems: two major systems known as the West and East systems, and three small service areas supplied by the Cities of Chanhassen, Excelsior, and Tonka Bay. Each major system is served by three groundwater wells and one water tower. Chlorine is added for disinfection and fluoride to prevent tooth decay at each well house. Population and Water Demand The population of the City of Shorewood shows an increasing trend over the last ten years. Despite this growth, the average daily water demand and the per capita water demand have shown a decreasing trend. Improved appliances, reduced irrigation, general attitudes toward conservation, and rainfall likely all play a role in these trends. Growth and Demand Projections The Metropolitan Council projects that the City of Shorewood will continue to develop and grow over the lifetime of this Plan, and that its total per capita water use will plateau by the year 2020. The City of Shorewood's water distribution system is expected to serve 4,110 people by the year 2040, at which time the projected total per capita water use of 109 gallons per capita per day will result in an average day demand of 0.45 million gallons per day and a maximum day demand of 1.17 million gallons per day. Proposed Improvements The City has planned several improvements to its well houses over the next few years. In addition, trunk watermain will need to be extended to accommodate future developments, as well as existing unserviced developments wishing to connect to the City system. Changes From 2030 Plan This plan provides greater detail on the existing system, including interconnections with neighboring systems and those areas served by neighboring communities. The DNR has also been increasing its emphasis on water conservation, wellhead protection, and natural resource impacts, so this plan includes additional detail on Shorewood's efforts in those areas. Comprehensive Water Plan City of Shorewood, MN WSB Project No. 2925 -36 TABLE OF CONTENTS EXECUTIVE SUMMARY .................................................................. ..............................1 Introduction...................................................................................................................... ..............................1 ExistingSystem ............................................................................................................... ..............................1 Population and Water Demand ....................................................................................... ..............................1 Growth and Demand Projections .................................................................................... ..............................1 ProposedImprovements ................................................................................................. ..............................1 INTRODUCTION.............................................................................. ............................... 2 Purpose.......................................................................................................................... ............................... 2 Background.................................................................................................................... ............................... 2 DataAvailable ................................................................................................................ ............................... 3 General Contact Information ........................................................................................... ..............................3 Water Use Categories and Definitions ............................................................................ ..............................3 EXISTINGSYSTEM .......................................................................... ..............................4 Water Sources and Treatment ........................................................................................ ..............................4 WaterStorage ................................................................................................................ ............................... 4 WaterDistribution ............................................................................................................ ..............................5 POPULATION AND WATER DEMAND .......................................... ............................... 7 Existing Water Conservation Policies ............................................................................ ............................... 9 WellheadProtection ....................................................................................................... .............................10 GROWTH AND DEMAND PROJECTIONS ..................................... .............................11 Future Water Conservation Policies .............................................................................. .............................12 PROPOSED IMPROVEMENTS ....................................................... .............................14 Proposed Sources and Treatment ................................................................................. .............................14 ProposedStorage .......................................................................................................... .............................15 ProposedDistribution ..................................................................................................... .............................15 EMERGENCY PREPAREDNESS PROCEDURES ......................... .............................16 Federal Emergency Response Plan .............................................................................. .............................16 Operational Contingency Plan ....................................................................................... .............................16 Emergency Response Procedures ................................................................................ .............................16 Procedures for Augmenting Water Supplies .................................................................. .............................17 FIGURES Figure 1 Existing Water Supply System Comprehensive Water Plan City of Shorewood, MN WSB Project No. 2925 -36 EXECUTIVE SUMMARY Introduction The City of Shorewood's Comprehensive Water Plan describes the City's existing water distribution system and water demand, projects future water demand through the year 2040, and proposes infrastructure improvements to accommodate that demand. This Plan has been prepared according to the guidelines established by the Metropolitan Council and the Minnesota Department of Natural Resources (DNR). The Water Supply Plan immediately following this report follows the template provided by the DNR, while this Comprehensive Water Supply Plan expands upon the template and provides further information for City and Metropolitan Council planning. Existing System The City of Shorewood's water distribution system provides approximately 145 million gallons of water each year to nearly 1,500 service connections. The overall system is composed of several separate water distribution systems: two major systems known as the West and East systems, and three small service areas supplied by the Cities of Chanhassen, Excelsior, and Tonka Bay. Each major system is served by three groundwater wells and one water tower. Chlorine is added for disinfection and fluoride to prevent tooth decay at each well house. Population and Water Demand The population of the City of Shorewood shows an increasing trend over the last ten years. Despite this growth, the average daily water demand and the per capita water demand have shown a decreasing trend. Improved appliances, reduced irrigation, general attitudes toward conservation, rainfall, likely all play a role in these trends. Growth and Demand Projections The Metropolitan Council projects that the City of Shorewood will continue to develop and grow over the lifetime of this Plan, and that its total per capita water use will plateau by the year 2020. The City of Shorewood's water distribution system is expected to serve 4,110 people by the year 2040, at which the projected total per capita water use of 109 gallons per capita per day will result in an average day demand of 0.45 million gallons per day and a maximum day demand of 1.17 million gallons per day. Proposed Improvements The City has planned several improvements to its well houses over the next few years. In addition, trunk watermain will need to be expanded to accommodate the location and rate of future developments, or existing unserviced developments that wish to connect to the City system. Comprehensive Water Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 1 INTRODUCTION Purpose This Comprehensive Water Supply Plan is a section of the City's 2040 Comprehensive Plan. The purpose of the Comprehensive Water Supply Plan is to provide an overview of the City's current drinking water resources, infrastructure, policies, and challenges, and to present future plans. The City of Shorewood has identified the following policies and goals for its water distribution system: • The overall water system is to remain financially self- supporting. • Any future extensions of City water must be consistent with the overall plan for City water (i.e. pipe sizes). • Properties used for commercial purposes, multiple - family residential purposes involving four or more dwelling units, and single - family residential developments of more than three lots shall connect to the municipal water system where it is technically and financially feasible • Allow water main extensions to provide water to residents where technically and financially feasible and where demand can be demonstrated. Consider a super- majority of residents as being demand for water extensions. This Comprehensive Water Supply Plan has been prepared according to the guidelines established by the Metropolitan Council and the Minnesota Department of Natural Resources (DNR) per Minnesota Statute 473.859, which requires water supply plans be completed by all local units of government in the seven - county Metropolitan Area. The attached Water Supply Plan conforms to the template provided by the DNR, while this Comprehensive Plan expands upon the template and provides further information for City and Metropolitan Council planning. Background The City of Shorewood is located in Hennepin County on the southern shores of Lake Minnetonka and includes 5.5 square miles of land area and 8.0 square miles of open water. Only a portion of the properties within the City limits are currently served by the City's water utility; the other portion, including the islands, is served by private wells. The scope of this study includes the population projections from the City's overall Comprehensive Plan, consistent with the Metropolitan Council Environmental Services (MCES) City System Statement, to project water system demands for the City of Shorewood through the year 2040. The 2040 service area was defined based on the Land Use Plan prepared for the City's 2040 Comprehensive Plan. Existing and future water demands were calculated for the City based on the historical data and population projections. Comprehensive Water Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 2 Data Available The following sources of information were used to prepare this report: • Water Supply Plan for the City of Shorewood, prepared by WSB & Associates, Inc. • MCES System Statement for the City of Shorewood • Water usage data as reported by the City to the DNR's Minnesota Permitting and Reporting System (MPARS) • Wellhead Protection Plan for the City of Shorewood General Contact Information City of Shorewood Water System DNR Water Appropriation Permit Number: 1974 -5226 Ownership: Public Metropolitan Council Area, Hennepin County MDH Supplier Classification: Municipal Public Works Director: Larry Brown, PE 5755 Country Club Road Shorewood, MN 55331 Phone: (952) 474 -3236 Water Use Categories and Definitions General water use categories and definitions used in this report, as defined by the Department of Natural Resources, are as follows: • Residential uses consist of water being used for normal household purposes, such as drinking, food preparation, bathing, washing clothes and dishes, flushing toilets, and watering lawns and gardens. • Institutional uses consist of those for hospitals, nursing homes, day care centers, and other facilities that use water for essential domestic requirements. This includes public facilities and public metered uses. Institutional water -use records are typically maintained for emergency planning and allocation purposes. • Commercial uses consist of water used by motels, hotels, restaurants, office buildings, and commercial facilities. • Industrial uses consist of water used for thermoelectric power (electric utility generation) and other industrial uses such as steel, chemical and allied products, food processing, paper and allied products, mining, and petroleum refining. • Wholesale deliveries consist of bulk water sales to other public water suppliers. • Unaccounted water is the volume of water withdrawn from all sources minus the volume sold. ■ Non - essential water uses as defined by Minnesota Statutes 103G.291, include lawn sprinkling, vehicle washing, golf course and park irrigation, and other non - essential uses. Some of the above categories also include non - essential uses of water. Comprehensive Water Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 3 EXISTING SYSTEM The existing water distribution system for the City of Shorewood is shown in Figure 1. It currently serves nearly 1,500 connections. The system consists of approximately 30 miles of watermain, including both ductile iron pipe ranging from 6 -inch to 20 -inch in diameter. The existing water system consists of three separate systems: West and East major systems, and a smaller central system. Each major system is served by three wells and one water tower. Water Sources and Treatment Well information by system is provided in Table 1. The total well pumping capacities in the West and East systems are 1,750 gpm and 1,850 gpm, respectively. The West System has a firm capacity (capacity with the largest well out of service) of 1,000 gpm, and the East System has a firm capacity of 850 gpm. Well logs and maintenance reports are included in Appendix 1. The City's water level monitoring plan is included in Appendix 2, and water level graphs for each well are included in Appendix 3. Table 1. Well Summary Well Name System Year Capacity . and ID Installed .. Well 1 Prairie du Chlorine & East 1973 750 528 Active #232331 Chien - Jordan Fluoride Well 3 St. Peter - Chlorine & West 1981 750 359 Active #161414 Jordan Fluoride Well 4 Tunnel City - Chlorine & West 1981 500 640 Active #171020 Wonewoc Fluoride Well 5 Tunnel City - Chlorine & West 1981 500 640 Active #171023 Wonewoc Fluoride Well 6 Prairie du Chlorine & East 1982 100 280 Active #122298 Chien Group Fluoride Chlorine, Well 7 Prairie du East 1986 1,000 415 Active Fluoride, & #416160 Chien - Jordan Iron Removal Chemicals are applied to the raw water in each well house. Chlorine is applied for disinfection, and fluoride is applied to prevent tooth decay. Water Storage The West System has one 500,000 gallon steel elevated storage tank located on Smithtown Road beside the Minnewashta Elementary School that was constructed in 1995. The East System has one 400,000 gallon steel elevated storage tank located on Old Market Road where it meets MN State Highway 7 that was constructed in 1986. Comprehensive Water Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 4 Water Distribution The West System provides service primarily to the developments to the west of Excelsior. Pipe diameters in this half of the system range from 6 -inch to 20 -inch of ductile iron watermain. The 20 -inch watermain is a short segment connecting the water tower to the system. The 16 -inch trunk watermains run along Smithtown Road, Eureka Road, and Minnetonka Drive. The remainder of the watermain is 6 -inch, 8 -inch, and 12 -inch. The East System provides service to the developments to the east of Excelsior. This half of the system includes pipe diameters from 6 -inch to 16 -inch of ductile iron watermain. The 16 -inch watermain connects the water tower to the system, while the 12 -inch trunk watermain runs along MN State Highway 7, Old Market Road, and St. Albans Bay Road. The remainder of the watermain in this half of the system is 6 -inch and 8 -inch. Comprehensive Water Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 5 CITY OF SHOREWOOD Shorewood Comprehensive Water dr f Supply Plan ---- - - - - -I Figure 1: Existing Water Lake Supply System � William I 4 - I - - -- Hooper Lake II I II City Boundary ° 1 Interconnection Edge wood Rd ` Tonka Bay Service Area i� - omo ake O o Production Well nor Water Tower oa -i �s Excelsior Service Area (�- Watermain �O1 Smithtown � Smithtown Rd Mary - Lake ollege Lak / Mod�hg�r Lake r- -J Gal in °h �� J Diameter 611 811 v Stones rs��xE ake 1 I 12" - - - - - - - -- - - - -- -- -------- - - - - -- --- - - - - -- C------ - - - - - - - -- — 1611 n 20 Bay ® Chanhassen Service Area _ Unknown r /�xESO.a 17 II �� N A 0 2,500 WSB Feet 1 inch = 2,500 feet - Document Path: K:\02925-360\GIS\Maps\VVater - VVastewater\VVaterSuDDIv Existing-d! Date Saved: 2/27/2018 9:58:44 AM POPULATION AND WATER DEMAND The population served by the City of Shorewood's water system shows an increasing trend over the last ten years. The total population served by the City's water system was 3,865 in 2015. Population, water use, and water demand data from the past ten years are listed in Table 2. Despite the increase in population served and the number of water connections, the total water used and the total water pumped have been decreasing steadily since 2012. The residential and total per capita water demands also show decreasing trends since 2012. It is likely that improved appliances, reduced irrigation, general attitudes toward conservation, rainfall, and climate all play a role in these trends. Table 2 — Historic Water Demand Comprehensive Water Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 7 ed Total Connections Total Water Use (MG) Total Water Pumped (MG) Percent Unmetered/ Unaccounted Average Daily Demand (MGD)' Max. Daily Demand (MG D) Date of Max. Demand Residential Per Capita Demand (GPCD) Total Per Capita Demand (GPCD) Comprehensive Water Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 7 Table 4 lists the top commercial water users by volume, from largest to smallest, for the City of Shorewood. Table 4 — Large Volume Commercial Users Customer Kraus - Anderson, Inc. Category Commercial Use .. year) 1,600,000 Percent of Total Water Use 1.29% Cub Foods Commercial 1,096,000 0.89% Minnetonka School District No. 276 School 1,052,900 0.85% Shorewood Ponds Homeowners Association Residential 715,262 0.58% Shorewood Oaks Partnership Residential 677,000 0.55% Waterford Center LLP Commercial 504,000 0.41% New Horizon Academy Commercial 484,102 0.39% Comprehensive Water Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 8 Existing Water Conservation Policies Although Minnesotans benefit from the state's abundant water supplies, those supplies are finite and potential threats exist that could impact the quality of our drinking water. Factors that can potentially limit water supply include population increases, economic trends, uneven statewide availability of groundwater, climate change, and degraded water quality. There are many benefits to enacting water conservation policies and many practical, feasible objectives the City has already and will continue to pursue. The average total water pumped per year in the City of Shorewood from 2012 to 2016 was 149 million gallons, with an average of 0.9% of that usage being unmetered or unaccounted. The average residential per capita demand has been decreasing steadily since 2012. From 2012 to 2016 the average residential per capita use was 97 gallons per day, which is greater than the DNR's recommended residential demand of less than 75 gallons per capita per day. As previously discussed, the decrease in residential per capita demand may be attributed to improved appliances, reduced irrigation, general attitudes toward conservation, and rainfall. Comprehensive Water Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 9 Wellhead Protection Long -term preventative programs and measures for the City's existing water system will help reduce the risk of emergency situations. The City of Shorewood has a number of programs to help reduce these risks. This includes a Wellhead Protection Plan (WHPP) that was adopted in December of 2015 and is due to be updated in 2025. It lists the following goals: 1. Maintain or improve the current level of water quality so that the municipal water supply will continue to meet or exceed all applicable state and federal water quality standards. 2. Continue to supply sufficient water quantity for system users and emergency needs. 3. Provide and promote activities that protect the source water aquifer that provides water to the municipal system. This will include increased public awareness of the Wellhead and Source Water Protection Program and groundwater - related issues as well as management of the identified potential contaminant sources and conveyance mechanisms within the Drinking Water Supply Management Area ( DWSMA). 4. Continue to collect data to support future wellhead and source water protection efforts. In order to achieve these objectives, the WHPP lists the following measures to be implemented: • Well Management • Promote proper sealing of abandoned, unused, unmaintained, or damaged wells • Identify remaining unlocated wells within the DWSMA • Educate the public about proper well management • Identify new high- capacity wells within the DWSMA • Continue to monitor the water quality from the City's wells • Update the Inner Wellhead Management Zone (IWMZ) surveys • Monitor and work to minimize impacts within the IWMZ area • Public Education • Foster public support for and understanding for the WHPP • Develop an understanding for the location of the gas and oil pipelines within the DWSMA • Storage Tank Management o Educate owners of all storage tanks greater than 1,100 gallons within the moderate vulnerability area of the DWSMA on the importance of spill prevention • Data Collection • Continue to collect and maintain local geologic and hydrogeologic data • Evaluate the water quality monitoring strategy and results • Maintain up to date information about wells and potential contaminant sources within the DWSMA • Land Use Planning and Zoning o Consider the location of the DWSMA during land use planning and zoning • Implementation o Track and report WHPP activities • Evaluation o Evaluate the WHPP Comprehensive Water Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 10 GROWTH AND DEMAND PROJECTIONS The City of Shorewood is projected to experience gradual growth and development. The City's projected population and water demands are listed in Table 5. The population projections were calculated using the Metropolitan Council estimated rate of growth through the year 2040 for the City of Shorewood and the known population and population served values from 2016. As of 2016, any new population growth will be serviced by the municipal water system. The total per capita water demand of 109 gallons per capita per day was calculated from the average 2012- 2016 demand, shown in Table 2. A peaking factor of 2.6, which is the City's average 2012 -2016 peaking factor, was applied to calculate maximum day demand. The maximum day demand is expected to reach 1.165 million gallons per day by the year 2040. It is important to note that there are several connections located in the south - central part of Shorewood that receive water from the Cities of Chanhassen, Excelsior, and Tonka Bay. The population served by these connections is estimated to be approximately 151. Given the peaking factor and the total per capita water demand used in this study, the connections supplied by neighboring communities require an estimated maximum day demand of 0.043 million gallons per day. This maximum demand flow was removed from the City -wide maximum demand displayed in Table 5 prior to distributing total maximum demand between the East and West systems based on historical water pumping data. The expected increase in demand through the year 2040 was assigned to each system based on the location of expected development or redevelopment. The City reserves the right to deny permission for a subdivision if City water is not available at that property. Table 5 — Projected Annual Water Demand Comprehensive Water Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 11 Projected Per Projected Total East System West System Projected Projected Projected Projected r Population Capita Water Average Maximum Maximum Maximum Demand Demand Served (GPCD) (MGD) Demand Demand Demand (MGD) (MGD) (MGD) GPCD c2llots n- .� �0. 11 a •� �. •� �- �. Comprehensive Water Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 11 Future Water Conservation Policies The Minnesota DNR has established eight water conservation objectives and strategies. These are listed below with comments on the City of Shorewood's progress towards the completion of each. 1. Reduce unaccounted (non- revenue) water loss to less than 10 %. • The City's average unaccounted water use from 2012 to 2016 was 0.9 %, which is well below the recommended target of 10 %. The City has an automated meter system to notify the City of leaky fixtures, and leak detection surveys are performed as needed. • There are a total of over 1,400 metered connections in Shorewood. The City completed meter replacement projects in recent years, 2007 and 2009. Meter replacement efforts completed by the City consisted of converting the majority of the meters (1,393) into automatic meters. Residential and commercial meters are tested as requested by the owner. 2. Achieve residential demand of less than 75 gallons per capita per day. • The average residential per capita water demand for the City of Shorewood from 2012 to 2016 was 97 gallons per capita per day (gpcd), which is greater than the DNR's 75 gpcd target. Data from the DNR and the City indicates that residential water demand has been decreasing since 2012. • In order to continue reducing residential demand, the City will review its ordinances on water efficient landscaping and water reuse annually, consider revising its ordinance to limit irrigation in 3 -6 years, continue to make water system improvements, provide incentives for installing water efficient appliances and fixtures in 1 -3 years, and provide incentives to reduce outdoor water use in 1 -3 years following adoption of this plan. The City will also continue water conservation education and outreach. 3. Achieve at least a 15% reduction in per capita daily demand across all customer categories over the next 10 years. • The City of Shorewood will conduct facility water use audits annually, install enhanced water meters capable of automated readings to detect spikes in consumption, install conservation fixtures and appliances, repair leaking system components, investigate water reuse, and reduce outdoor water use. 4. Achieve a decreasing trend in total per capita demand. • Residential water usage shows a fluctuating trend, although it has steadily decreased since 2012. Commercial, institutional, and industrial (C /l /1) water use follows a similar trend. Decreases in water usage since 2012 may be attributed to water efficient fixtures and public education on the importance of water conservation. A graph showing total per capita water demand by customer category is included in Appendix 8. 5. Reduce peak day demand so that the ratio of maximum to average day demand is less than 2.6. • The City's ten -year average (2005 -2014) ratio of maximum to average day demand is 3.3. The position of the DNR has been that a peak day /average day ratio that is Comprehensive Water Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 12 above 2.6 indicates that the volume of water being used for irrigation in a community is too high and that efforts should be made to reduce the peak day use by the community. 6. Implement a conservation water rate structure • The water rates in Shorewood are based on an increasing block rate structure. This rate structure promotes water conservation because the price is volume- tiered. Water billing in Shorewood is on a quarterly schedule, and a copy of the rate structure is included in Appendix 9. • The City has also implemented restricted summertime lawn watering hours to reduce peak day demands during months of high water usage. 7. Additional strategies to reduce water use and support wellhead protection planning • The City of Shorewood will consider implementing a rebate program for water efficient appliances and fixtures. 8. Tracking success The City will continue to monitor water usage by customer category, including the City's regular maintenance activities (hydrant flushing, street sweeping, etc.). Regulation The City of Shorewood has implemented regulation to reduce demand and improve efficiency in its water system. During May 1 I through September 30th each year, residents can water lawns only before 11:00 a.m. and after 4:30 p.m. This regulation helps prevent wasteful irrigation and reduces summer season water demands. A critical water deficiency ordinance has also been established. A summary of these and additional water regulations is included in Appendix 10. Retrofitting Programs The Minnehaha Creek Watershed District (MCWD) provides education about rain gardens and native and drought tolerant landscaping and has a cost share program to encourage clean - water landscaping. Education and Outreach The City has implemented, or plans to implement, the following education and outreach programs: • Consumer Confidence Reports prepared annually • Shore Report, News for Residents of the City of Shorewood, prepared each month • Information available at utility and public buildings and on the City website ( http: / /www.ci.shorewood.mn.us /) Comprehensive Water Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 13 PROPOSEDIMPROVEMENTS The City of Shorewood's water system will require maintenance and trunk watermain expansions through the year 2040. Table 6 lists the improvements proposed, along with estimated dates of implementation and costs, in order to maintain the City's system. In addition, the City's Capital Improvement Plan is included in Appendix 4. Table 6 — Proposed Capital Improvements *Values listed include both direct and indirect costs. Proposed Sources and Treatment It is recommended that a City's treatment or production capacity be equal to at least the maximum day demand with the largest well out of service (firm capacity). Since the City has two separate systems, each should be able to satisfy this constraint individually. The West System's firm capacity is 1,000 gpm. The daily demand for this system is projected to reach a maximum of 366 gpm by the year 2040. Thus, maximum day demand for this system is not projected to exceed its firm capacity by the end of the planning period. The East System's firm capacity is 850 gpm. The daily demand for this system is projected to reach a maximum of 414 gpm by the year 2040. Thus, maximum day demand for this system is not projected to exceed its firm capacity by the end of the planning period. Comprehensive Water Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 14 Improvement Boulder Bridge Building $60,000 Boulder Bridge Well Motor Control Center $200,000 2018 Well House Water Meters $6,000 SE Area Well Residing $45,000 Water Mains $750,000 Amesbury Well Anti - Corrosion and Pipe Coatings $30,000 2019 Well House Water Meters $12,000 Boulder Bridge Dehumidifier $5,000 Boulder Bridge Well Motor $45,000 2020 Boulder Bridge Anti Corrosion and Pipe Coatings $30,000 Well House Water Meters $6,000 *Values listed include both direct and indirect costs. Proposed Sources and Treatment It is recommended that a City's treatment or production capacity be equal to at least the maximum day demand with the largest well out of service (firm capacity). Since the City has two separate systems, each should be able to satisfy this constraint individually. The West System's firm capacity is 1,000 gpm. The daily demand for this system is projected to reach a maximum of 366 gpm by the year 2040. Thus, maximum day demand for this system is not projected to exceed its firm capacity by the end of the planning period. The East System's firm capacity is 850 gpm. The daily demand for this system is projected to reach a maximum of 414 gpm by the year 2040. Thus, maximum day demand for this system is not projected to exceed its firm capacity by the end of the planning period. Comprehensive Water Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 14 Proposed Storage It is recommended that a system's total storage capacity equal or exceed its average day demand. The West system's storage capacity of 500,000 gallons exceeds its projected 2040 average day demand of 203,000 gallons. The East system's storage capacity of 400,000 gallons also exceeds its projected 2040 average day demand of 229,000 gallons. Proposed Distribution To provide service to future and existing developments, the City will need to expand trunk watermain in several areas. Areas in need of expansion were identified in the 2012 Water Distribution Plan Update through the year 2031. The main goal of the 2012 Water Distribution Plan was to provide recommendations for the City's water system expansion including a Capital Improvement Plan cost forecast for watermain segments, alternative construction methods to reduce overall project costs, policy alternatives to encourage residents to connect to the City's distribution system, and alternatives for funding the expansion of the system. The plan projected a $26 million investment to expand the water distribution network over a twenty -year time span. The majority of the plan focused on the expansion of the system by proposing the addition of lateral watermain (8 -inch diameter and smaller) to provide general distribution of water to properties, with a few trunk mains (10 -inch diameter and greater) to provide water distribution to networks of lateral watermain. Comprehensive Water Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 15 EMERGENCY PREPAREDNESS PROCEDURES Water emergencies can occur as a result of vandalism, sabotage, accidental contamination, mechanical problems, power failures, drought, flooding, and other natural disasters. The purpose of emergency planning is to develop emergency response procedures and to identify actions needed to improve emergency preparedness. In the case of a municipality, these procedures should be in support of, and part of, an all- hazard emergency operations plan. Federal Emergency Response Plan Section 1433(b) of the Safe Drinking Water Act, as amended by the Public Health Security and Bioterrorism Preparedness and Response Act of 2002 (Public Law 107 -188, Title IV — Drinking Water Security and Safety), requires community water suppliers serving over 3,300 people to prepare an Emergency Response Plan. The City of Shorewood has a Federal Emergency Response Plan that was revised in 2011. The contacts for this plan are: Emergency Response Lead: Larry Brown Phone: (952) 960 -7913 Email: (brown @shorewoodpw.com Operational Contingency Plan The State recommends that all utilities develop an operational contingency plan that describes measures to be taken for water supply mainline breaks and other common system failures, as well as for routine maintenance. A contact list for contractors and suppliers and a water emergency telephone list that act as an Operational Contingency Plan are included in Appendix 5. Emergency Response Procedures Quick access to concise and detailed information on water sources, water treatment, and the distribution system may be needed in an emergency. System operation and maintenance records should be maintained in secured central and back -up locations so that the records are accessible for emergency purposes. A detailed map of the system showing the water sources, treatment plant, storage facilities, supply lines, interconnections, and other information that would be useful in an emergency should also be readily available. It is critical that public water supplier representatives and emergency response personnel communicate about the response procedures and be able to easily obtain this kind of information both in electronic and hard copy formats (in case of a power outage). The City of Shorewood maintains records and maps of the water system. City staff can access these resources from a central secured location in the event of an emergency, and appropriate staff know where these resources are located. Comprehensive Water Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 16 Procedures for Augmenting Water Supplies The City of Shorewood has six interconnections with four neighboring communities, to be used only in the event of an emergency. Each interconnection has a capacity of 1,000 gpm. The interconnections are with Minnetonka at Vine Hill Road and Shady Hills Road and at Vine Hill Road and Waterford Place; with Chanhassen at Silver Lake Trail; with Victoria at Smithtown Road; and with Tonka Bay at CSAH 19 and Glen Road and at CSAH 19 and Smithtown Road. The City is exploring a possible interconnection with the City of Excelsior and has identified potential locations for that interconnection. Copies of the cooperative agreements for these interconnections are included in Appendix 6. In the case of a short -term emergency, the City would need to obtain and distribute bottled water. For a long -term emergency, the City will evaluate the cause of service disruption and will determine if a new water source or improved water treatment is necessary. The scale of the response will depend on the cause of the disruption. In this case, a feasibility study will be conducted to determine the most cost - effective solution to the issue. Allocation and Demand Reduction Procedures and Triggers The City must prepare procedures to address gradual decreases in water supply, as well as emergencies and the sudden loss of water due to line breaks, power failures, sabotage, etc. These allocation and demand reduction procedures must be consistent with Minnesota State Statute 103G.261 that identifies and defines the priorities in which water usage will be allocated in the event of an emergency. They are defined as follows: 1. Domestic water supply only, excluding industrial and commercial uses of municipal water supply. The first priority also includes uses for power production that meet contingency requirements. Domestic use is defined by MN Rules 6115.0630, Subp. 9, as use for general household purposes for human needs such as cooking, cleaning, drinking, washing, and waste disposal, and uses for on -farm livestock watering excluding commercial livestock operations which use more than 10,000 gallons per day or one million gallons per year. 2. Consumption of less than 10,000 gallons per day. 3. Agricultural irrigation and processing of agricultural products of more than 10,000 gallons per day. 4. Power production in excess of the use provided for in the contingency plan. 5. All other water use of more than 10,000 gallons per day. 6. Non - essential uses. These uses are defined by Minnesota Statutes 103G.291 as lawn sprinkling, vehicle washing, golf course and park irrigation, and other non - essential uses. Comprehensive Water Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 17 Table 6 lists the priority ranking, average day demand, and demand reduction potential for each customer category in the City. Table 6 — Water Use Priorities GPD = gallons per day *Non- essential use calculated as increased summer demand across all customer categories. The City of Shorewood will use the following conditions to trigger an emergency response: ■ Contamination • Loss of Production • Infrastructure Failure • Governor's Executive Order The City of Shorewood has identified the following short -term and long -term actions to be implemented as part of an emergency response: Short -term Actions • Supply augmentation through interconnection(s) • Enforce its critical water deficiency ordinance • Allocate water through emergency action of the City Council Comprehensive Water Plan City of Shorewood, MN WSB Project No. 2925 -36 Long -term Actions • Supply augmentation through interconnections • Enforce its critical water deficiency ordinance • Allocate water through emergency action of the City Council • Meet with large water users to discuss their contingency plan PAGE 18 Customer Allocation Average Day Short -Term Emergency Demand Reduction Category Priority Demand (GPD) Potential (GPD) • ential •• GPD = gallons per day *Non- essential use calculated as increased summer demand across all customer categories. The City of Shorewood will use the following conditions to trigger an emergency response: ■ Contamination • Loss of Production • Infrastructure Failure • Governor's Executive Order The City of Shorewood has identified the following short -term and long -term actions to be implemented as part of an emergency response: Short -term Actions • Supply augmentation through interconnection(s) • Enforce its critical water deficiency ordinance • Allocate water through emergency action of the City Council Comprehensive Water Plan City of Shorewood, MN WSB Project No. 2925 -36 Long -term Actions • Supply augmentation through interconnections • Enforce its critical water deficiency ordinance • Allocate water through emergency action of the City Council • Meet with large water users to discuss their contingency plan PAGE 18 Notification Procedures The City of Shorewood has developed the following plan to inform customers regarding conservation requests, water use restrictions, and suspensions; with the support of City staff, neighboring communities, and local news outlets: Short -term demand reduction declared (within one year) Frequency: Monthly • Website • Social media (e.g. Twitter, Facebook) • Direct customer mailing • Press release (TV, radio, newspaper) • Public alert community notification system Enforcement Long -term demand reduction declared (over one year) Frequency: Annually • Website • Social media (e.g. Twitter, Facebook) • Direct customer mailing • Press release (TV, radio, newspaper) Governor's Critical water deficiency declared Frequency: As Needed • Website • Social media (e.g. Twitter, Facebook) • Direct customer mailing • Press release (TV, radio, newspaper) Minnesota Statutes require public water supply authorities to adopt and enforce water conservation restrictions during periods of critical water shortages. As stated in Minnesota Statutes 103G.291, Subdivision 1, regarding public water supply appropriation during deficiency, if the governor determines and declares by executive order that there is a critical water deficiency, public water supply authorities appropriating water must adopt and enforce water conservation restrictions within their jurisdiction that are consistent with rules adopted by the commissioner. The restrictions must limit lawn sprinkling, vehicle washing, golf course and park irrigation, and other nonessential uses, and have appropriate penalties for failure to comply with the restrictions. The City has a critical water deficiency ordinance defined in Shorewood City Code, Chapter 9: Section 903.12 Subd.1. A copy of this ordinance is included in Appendix 7. The City has authorized the City Council to have standing authority to implement water restrictions, which improves response times for dealing with water emergencies. Comprehensive Water Plan City of Shorewood, MN WSB Project No. 2925 -36 PAGE 19