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HomeMy WebLinkAboutWater Supply and Distribution Plan May 2008OAR PARR HEI GHTS - WATER SUPPLY AND DISTRIBUTION PLAN Table of Contents ExecutiveSummary ...................................................................................................... ............................... i 1. Introduction ...................................................................................................... ..............................1 1.1 Purpose and Objectives .......................................................................... ..............................1 1.2 Background ............................................................................................ ..............................1 2 Water Demands ................................................................................................ ..............................3 2.1 General .................................................................................................. ..............................3 2.2 Relationship to Land Use Plan and Population Forecasts ......................... ..............................3 2.3 Variations in Water Usage ...................................................................... ..............................4 2.4 Water Demand by Customer Category .................................................... ..............................5 2.5 Projected Water Usage ........................................................................... ..............................5 2.6 Fire Demand ........................................................................................... ..............................6 4 Proposed Facilities ........................................................................................... .............................10 4.1 Supply- Storage Considerations .............................................................. .............................10 4.2 Hydraulic Analysis ................................................................................. .............................11 4.3 Raw Water Supply ................................................................................. .............................12 4.4 Water Treatment ................................................................................... .............................12 4.5 Storage ................................................................................................. .............................13 4.6 Distribution System ................................................................................ .............................13 4.7 Water System Phasing ........................................................................... .............................14 5 Economic Analysis ............................................................................................ .............................15 5.1 Cost Estimates ...................................................................................... .............................15 5.2 Water System Trunk Charges ................................................................. .............................15 City of Oak Palk Heights Projeaft, 55- 06143 -0 Water SuppyandDistnbuvon Plan # Bonestroo Appendix A — Emergency and Conservation Plan ........................................................................ .............................16 B— Model Results ....................................................................................................... .............................17 C— Cost Estimate Summary ........................................................................................ .............................18 D —Water Quality Requirements ................................................................................. .............................19 E— Supplemental Maps .............................................................................................. .............................20 List of Figures Figure 1 Maximum Day Demand Curve ................................................................... .............................11 List of Maps ExistingFire Flows ...................................................................................... ............................... Appendix B UltimateFire Flows .................................................................................... ............................... Appendix B StaticPressure Map .............................................................. ............................... .......................Appendix E Ultimate Trunk Water Distribution System Map ..................... ............................... .......................Appendix E List of Tables Table 1 Service Population Projections... .............................................................................................. 4 Table 2 Projected Water Demands, ...................................................................................... ................ 6 Table 3 Recommended Fire Flows ........................................................................... ..............................6 Table 4 Existing Storage Facilities ........................................................................... ..............................8 Table 5 Trunk Water System Cost Summary ........................................................... .............................15 City o/ Oak Patk Heights Project/JO.' 55- 06143 -0 Water Supply andDistabution Plan OAK PARK HEIGHTS - WATER SUPPLY AND DISTRIBUTION PLAN Executive Summary INTRODUCTION This report presents a Comprehensive Water Supply and Distribution Plan of a water system that will meet both the near -term and ultimate needs of the City of Oak Park Heights. The most recent Comprehensive Water Plan was completed in 1998. GROWTH AND WATER DEMAND Oak Park Heights has experienced steady growth over the last 10 years. The 2005 estimated served population was 4,633. Water needs will continue to increase as the City builds to an estimated 2030 served population of approximately 5,700. Water use has increased steadily as population has grown. The City of Oak Park Heights currently pumps approximately 250 million gallons of water into the system each year. This corresponds to an average daily use of 680,000 gallons per day. Maximum day water use was 1.86 million gallons (MGD). The projected maximum day water demand for 2030 is 23 MGD. Projected water demands were based on the City's land use designations for the 2030 Comprehensive Plan. EXISTING FACILITIES The existing water supply and distribution system has served Oak Park Heights's needs quite well. The existing distribution system operates under three pressure zones, due to the variation in the City's topography. The high water level (in elevation) for each pressure zone is as follows: High Zone . .... .. ................. 1,083.8 Intermediate Zone ................1001 Low Zone ............................... 903 The City presently obtains its raw water supply from 2 wells. Two water towers stabilize pressures during peak water demands, and also serve as a source of water during fires or power outages. There is a total existing useful storage volume of 750,000 gallons. 2030 CAPITAL IMPROVEMENTS The recommended improvements necessary to meet Oak Park Heights's estimated 2030 trunk water supply and distribution needs will cost about $3,290,000, Improvements include: • 1 new back -up well. • Redevelop Wells 1 and 2 to provide additional capacity. • Trunk distribution system improvements. • Connections to the MCF- Stillwater and Bayport water systems for redundancy. City of Oak Park heights Project No: 55- 05743-0 Water Supply and0istribution Plan # Bonestroo i ECONOMIC ANALYSIS This report recommends that the City maintain the current system of using area charges and connection charges to finance the proposed Capital Improvement Plan, The City should review the Capital Improvement Program and Trunk Charge System annually and modify the program to better serve community development needs. The entire water supply and distribution plan should be revised every 5 to 10 years. RECOMMENDATIONS Based upon the results and analysis of this study, it is recommended that Oak Park Heights City Council: 1. Adopt this study as a guide to the orderly expansion of the City's water system. 2. Adopt the Water Supply Plan (emergency preparedness and conservation plans) included in this study and submit them to the Metropolitan Council and Department of Natural Resources for their approval. 3. Annually review the Capital Improvements Program and water system service charges to better serve community development needs. 4. Expedite acquisition of sites for wells, storage facilities, potential water treatment sites, and any easements required to connect these sites to the water system. 5. Monitor water quality and consumer complaints to screen out problems with high iron and manganese concentrations and insure compliance with drinking water quality standards. The need for water treatment should be evaluated if raw water quality problems arise in the future. Ciryo7Oak Park Heights Projed No.• 55-05143-0 Water5zW1randAshib'mon P/an #i 1Itestm // OAK PARK NEIGKTS - WATER SUPPLY AND DISTRIBUTION PLAN Introduction 1.1 PURPOSE AND OBJECTIVES The purpose of this water supply and distribution plan is to provide a comprehensive improvement program to meet the near -term and ultimate water supply needs for the City of Oak Park Heights. The most recent Water Supply and Distribution Plan was completed in 1998. The primary objective of this report is to provide a comprehensive water system plan for the entire City of Oak Park Heights. Specific objectives are as follows: Determine the potential ultimate water demands expected within the City and the production capacity and storage required to meet these demands. Develop a trunk water main system in accordance with present planning. Determine near -term supply and storage needs in order to allow sufficient lead time for the addition of facilities to the system. Hydraulically analyze the proposed ultimate system to ensure adequate residual pressures, and to develop an economical and efficient ultimate water system. Develop preliminary cost estimates for supply, storage, and distribution facilities to form a basis for a satisfactory financing program. 1.2 BACKGROUND Oak Park Heights has experienced steady growth over the last 15 years. The population served by city water at the end of 2005 was estimated at 4,633. Water needs will continue to increase as the City builds to an estimated 2030 service population of 5,700. Water usage within the City has generally increased with the increase in population. The City of Oak Park Heights pumped approximately 250 million gallons of water into the system in 2006. This corresponds to an average day demand of just over 680,000 gallons per day. Maximum day water demand was 1.86 million gallons per day (MGD). The projected increase in population will correlate with an increase in water demand, making the provision of a well planned water supply and distribution system a necessity. The development of a water system capable of supplying and distributing potable water of high quality to all points of demand at acceptable residual pressures requires advance planning. Such a system is dependent upon a strong network of trunk water mains complemented by properly sized and strategically located supply and storage facilities. A comprehensive plan based on the most reliable information presently available is necessary to ensure that adequate facilities are provided during a significant growth period and to allow flexibility for future adjustments. Without proper planning, haphazard and piece -meal construction can result in either undersized or oversized facilities. Either condition is very costly to a community since a water main that is too large is not fully utilized, while a main that is too small will eventually have to be paralleled or replaced. City o/ Oak Park Heights ProjectNO..' 55- 06143 -0 Water5uppty and 0istnbutton Plan . BW*St= r A municipal water system can be divided into three main categories: 1) supply and treatment facilities, 2) storage facilities, and 3) the distribution system. • Supply and Treatment Facilities include all equipment necessary to supply, pump and treat the amounts of water demanded by the system. For Oak Park Heights, it is proposed to consider only groundwater supply sources, or water, although this does not preclude the possibility of using surface water supply at some further date, or water from some other outside sources. The supply facilities thus include the wells, pumps, pumphouses, controls, raw water transmission mains, chemical feed (treatment) facilities, and all related facilities. • The Storage Facilities are the reservoirs used throughout the system to store water for usage during emergency and peak conditions. Water from storage is fed into the system either by gravity or by pumping through a booster station. Two types of reservoirs feed water directly into the system by gravity: (1) a ground reservoir with the floor resting on the ground and (2) an elevated reservoir with columns supporting the tank. A ground reservoir may also be constructed at an elevation which requires a booster station to pump the water into the system at the proper pressure. • The Distribution System is made up of the trunk water mains (primarily 10 inches or larger in diameter), lateral water mains (4 to 8 inches in diameter), service pipes, valves, hydrants, and all appurtenances necessary to convey water from the supply sources and reservoirs to the points of demand. Since the lateral water mains are normally routed along residential streets within a development, it is impossible to predict with any degree of accuracy where future laterals will be placed in undeveloped areas. These lines are excluded from consideration in analyzing the distribution system hydraulics. The phased construction of the Oak Park Heights water distribution system has primarily been dependent on development within the City. Where development occurs, water mains are constructed to serve those specific developments. However, development within a City is not always contiguous and gaps in the distribution system may result. As development continues to grow further away from the supply wells and reservoirs, these gaps can cause problems with insufficient supply and pressures since they prevent "looping" of the distribution system. Looping of the distribution system provides system reliability in the event of a water main break, but more importantly it provides the large flows required for fighting fires. One of the purposes of this report is to evaluate potential water pressure and supply problems and determine the most feasible solutions. City of Oak Pal Heights Proleaft 55- 06143 -0 WaterSupplyand0ismbudon P /an # Bonestroo 2 OAR PARR HEIGHTS - WATER SUPPLY AND DISTRIBUTION PLAN 2. Water Demands 2.1 GENERAL Capacity requirements for the three water system components of supply, storage, and distribution are dictated by the demands placed upon them for production and distribution. The design of the water supply and distribution system for Oak Park Heights was based on estimates of the future water demands. Phasing of the system improvements was based on estimates of near -term needs. Water demand (both peak and average) is affected by many factors including population, population distribution, commercial and industrial activity, water quality, water rates, climate, soil conditions, economic level of the community, sewer availability, water pressures and the condition of the water system. The most important factor is land usage, which encompasses residential and non - residential development. Projections of near -term and ultimate study area land usage and population for Oak Park Heights were correlated with past and present water demands to develop estimates of both near -term and saturation water demands in the City. 2.2 RELATIONSHIP TO LAND USE PLAN AND POPULATION FORECASTS The Water Supply and Distribution Plan was based on the Comprehensive Plan for the City. The City Land Use Plan for Oak Park Heights that served as a basis for the development of the proposed water supply and distribution system is presented on the Land Use Map in Appendix E. In addition, Oak Park Heights' staff developed preliminary land use assumptions for several parcels outside the current City limits. These parcels were determined to be areas that could easily be served with City sewer and water, if desired in the future. It is understood that if these land use assumptions are altered in future years, the sizing requirements derived in this report must be revised. POPULATION Population estimates for the City of Oak Park Heights for the study area were developed for use in the design of the distribution system, storage facilities, and well fields. The City's planned residential densities were used to project total population in the Study Area. The facilities described in this report are designed to serve a population of 5,700. Actual growth rates will affect only the timing of construction and not the actual design of the system. At this time, the City has no intent of providing water service to areas outside the MUSA or City Limits. As the MUSA and City Limits expand by orderly annexation, the water system will be expanded. CilyofOak Palk Heights Project No: 55- 06143-0 Water Supply andDistubuuon Plan # Bonestroo 3 TABLE 1 SERVICE POPULATION PROJECTIONS Year Metropolitan Council City Projections Projections (Served Population) 11 � 1 1 11 11 1 1 •11 .11 1 1 11 11 i 2.3 VARIATIONS IN WATER USAGE The rate of water consumption will vary over a wide range during different periods of the year and during different hours of the day. Several characteristic demand periods are recognized as being critical factors in the design and operation of a water system. The demand rates are expressed in million gallons per day (MGD), which in the case of a daily demand indicates the total amount of water pumped in a 24 hour period. Hourly rates are also expressed in million gallons per day. In the case of an hourly rate, the rate in MGD is determined by assuming that the demand would continue at the indicated rate for 24 hours, The average day demand is equal to the total annual pumpage divided by the number of days in the year. The principal significance of the average day demand is as an aid in estimating maximum day and maximum hour demands. The average day demand is also used in estimating future revenues and operating costs such as power and chemical requirements, since these items are determined primarily by the total annual water requirements rather than by daily or hourly rates of usage. The maximum day demand is the critical factor in the design of certain elements of the waterworks system. The principal items affected by the maximum day demand are: • raw water supply facilities, • treatment plant capacity, and • treated water storage requirements. The raw water supply facilities must be adequate to supply water near the maximum day demand rate and the water treatment plant must be capable of processing a majority of the water supplied. Sufficient treated water storage should be provided to meet hourly demands in excess of the water supply capacity. The installed capacities should also include reserves for growth, industrial development and fire protection. The maximum demands upon the water system are encountered during short periods of time, usually on days of maximum consumption. These short period demands are referred to as hourly demands, and they seldom extend over a period of more than three or four hours, generally during hot summer evenings when the sprinkling load is the highest. The maximum hour consumption rates impose critical demands on the distribution system, and major elements of the waterworks facilities must be designed to meet these demands and provide satisfactory service at all times. City of Oak Gal* Heights project No: 55- 06143 -0 Water Supply and0/smbution Plan BOneAm 4 Maximum hour demands in Oak Park Heights are supplied through a combination of water from the well pumps and water drawn from storage reservoirs on the distribution system. Although the rate of consumption is high during periods of maximum hourly demands, the duration of the extreme rate is relatively short. Therefore, a moderate quantity of water withdrawn from storage reservoirs strategically located on the system assures satisfactory service, minimizes the total maximum hour pumping and transmission main capacity required, and permits more uniform and economical operation of the wells and booster pump facilities. Storage on the system is also an important factor in insuring reliability of service during emergencies resulting from power failure, from temporary outages of water supply facilities, and from sudden and unusual demands brought about by fires or line breaks. In Oak Park Heights another critical situation should be evaluated in designing the system. The storage tanks are refilled during the night and early morning hours when demand on the system is low. A strong network of piping is needed between the supply sources and the reservoirs to insure that a sufficient amount of water can reach the storage tanks during the refilling period to provide the required supply for the following day. Additional detail about water usage patterns is found in the Water Conservation Plan in Appendix A. 2.4 WATER DEMAND BY CUSTOMER CATEGORY Analysis of past water usage by customer category provides additional insight into how water is being used in Oak Park Heights, and where potential for conserving water may be found. Data from 2005 indicates that City water use is 47% Residential, 48% Commercial, and 5% unaccounted for. Additional detail about water usage patterns is found in the Water Conservation Plan in Appendix A. 2.5 PROJECTED WATER USAGE Estimated future water usage is based on population, land use, and water use trends. Peak demands vary with land use. High peak usage rates are experienced in low density areas during hot, dry periods due to extensive lawn sprinkling, while usage in high density areas depends on human consumption to a greater extent. Average daily usage for commercial and industrial areas is very high, but is much more stable than residential usage. Therefore, although commercial and industrial areas have high average usage, the peak usage (maximum day and maximum hour demands) is comparable to those in residential areas. Each of the land use categories was examined with consideration given to population density, area of lawns to be sprinkled and other activities likely to occur compatible with the projected land usage. Demand rates were then developed for each land use type. Total water usage at designated discrete points of demand on the water system was determined for the purpose of hydraulic analysis and system design. This was accomplished by dividing the City into sub -areas whose total demand was assumed to be located at a designated point in each sub -area. The sub -areas were then further subdivided into the various land use categories, based on the Future Land Use Map. By applying the unit demand, the total demand for each sub -area was developed. Projected maximum day water demands are presented in Table 2. The maximum day water demands are used for the sizing of supply facilities. A record of actual maximum and average day demands should be charted to aid in the sizing and phasing of future facilities. City d Oak Park Heights Project No 55- 06143 -0 WawS4WP , ano`DBtabubon Plan BO *St= 5 This plan incorporates the following built -in assumptions. • Conservation Plan: Assumes successful implementation of the Water Conservation Plan. Exceeding the goals outlined in the conservation plan will result in additional water use reduction for the City. • Commercial /Industrial Water Use: The water use for any property can vary widely depending on their specific process, employment base, ability to recycle water, etc. Therefore, this report assumes an average water use of 1,500 gallons per day per acre for Industrial and Commercial land use. A 1:14 , 14,, f_1:111 TABLE 2 Water usage for fire demand is also a vital consideration in the design of a water supply and distribution system. Fire demand varies greatly from normal usage in that an extremely large quantity of water is required from a single demand point in a very short time. The quantity of water used for fires is almost negligible when compared to other usage categories, but because of the extreme rate of usage during an emergency situation, fire demands frequently govern design. The Insurance Services Office (ISO) recommends that a system the size of Oak Park Heights's be capable of delivering a fire demand of 500 gpm to 6,500 gpm for varying durations depending on the rate of demand. However, ISO does not provide premium deductions for providing fire flows in excess of 3,500 gpm. Recent experience with many commercial and industrial properties that implement fire suppression sprinkling systems has shown that 2,000 gpm to 3,500 gpm is generally considered sufficient for these properties. Table 3 shows the recommended fire flows used in the design of the Oak Park Heights water system. TABLE 3 RECOMMENDED FIRE FLOWS Land Use Commercial /Industrial Required Fire Flow • 3,500 Duration 3 Institutional /Public 3,500 3 Sprinkled Buildings' 2,000 3 Multi-Family Residential 1,500 2 Single-Family Residential 1,000 2 'Minimum desirable fire flow for Commercial / Industrial /Institutional /Public buildings CiyofOak Park Heights Projedwo: 55- 06143 -0 Water Supply and 0ish7bution Plan BOIt2Stm 6 PROJECTED WATER DEMANDS OAR PARR HEIGHTS - WATER SUPPLY AND DISTRIBUTION PLAN 3. Existing Facilities 3.1 WATER SUPPLY GENERAL The Twin Cities Metropolitan Area is underlain by geological formations that are capable of yielding large volumes of water. These formations were deposited in a trough that resulted in a unique dish - shaped geological structure centered below the Seven County Metropolitan Area. The Twin City Artesian Basin contains a total of six aquifers. Four of these aquifers, the Ironton - Galesville, the Franconia, the St. Peter, and the Platteville- Decorah, are minor aquifers. The major aquifers are the Prairie du Chien - Jordan and the Mt. Simon - Hinckley. The area also includes numerous smaller glacial drift aquifers. The Prairie du Chien - Jordan is the major aquifer in the Seven County Metropolitan Area, supplying approximately 75 percent of the area's groundwater. The majority of the remaining groundwater is supplied by the Mt. Simon - Hinckley aquifer. Where the Prairie du Chien - Jordan aquifer is overlaid by the St. Peter formation and the full thickness of the aquifer can be developed, well capacities can reach 2,500 gallons per minute (gpm). Where only the Jordan formation can be developed, the well capacities will usually fall into the range of 1,000 to 1,500 gpm. Hinckley wells can generally be developed to an 800 - 1,000 gpm capacity. The drawdown experienced with Hinckley wells causes higher pumping costs. Also, because the Hinckley formation lies beneath the Jordan and Franconia- Ironton - Galesville aquifers, Hinckley wells are more expensive to construct and operate than Jordan wells. In addition, State Legislation restricts the ability to withdraw water from the Mt. Simon - Hinckley aquifer. EXISTING WELLS There are two existing wells that currently serve Oak Park Heights with well capacities that have a total capacity of approximately 1,700 gpm. The firm capacity is defined as the capacity with the largest well out of service. Oak Park Heights' firm well capacity is 800 gpm (1.15 MGD). Oak Park Heights' wells are described in Appendix A. WELL WATER QUALITY AND TREATMENT The U.S. Environmental Protection Agency (EPA) has established national drinking water standards. These standards contain federally enforceable Maximum Contaminant Level (MCL) standards for substances known to be hazardous to public health. Water quality parameters are defined and regulated by two sets of standards — Primary and Secondary. Primary Standards are set for those substances known to be a hazard to public health. Secondary Standards are set for those substances that, although not hazardous to public health, frequently cause drinking water to have objectionable aesthetic qualities, such as taste and odor. A complete discussion of the drinking water standards can be found in Appendix D. City of Oak Patk Neighs Pfgy aft. 5506143 -0 WaterSapplyandOiswbvvon Plan # Bonestroo 7 Water quality test results on Oak Park Heights's raw water may be found in Appendix A. The test results indicate that the raw water generally is hard and contains acceptable levels of iron and manganese. The raw water is treated with fluoride prior to entering the distribution system. Both wells are equipped with chlorine feed systems (for disinfection) however, these systems are not used. No other treatment is provided. The water quality at the wells and in the distribution system is tested regularly to ensure that water quality is within the Primary and Secondary standards. Appendix D should be updated as new water quality requirements are promulgated. 3.2 STORAGE Maximum hour demands are supplied through a combination of water from the wells and water drawn from the storage reservoir on the water distribution system. Although the rate of consumption is high during periods of maximum hourly demand, the duration of the extreme rate is relatively short. Therefore, a moderate quantity of water withdrawn from storage reservoirs strategically located on the system assures satisfactory service, minimizes the total maximum hour pumping and transmission main capacity required, and permits more uniform and economical operation of the system and pumping facilities. Storage on the system is also an important factor in insuring reliability of service during emergencies resulting from loss of power, temporary outages of water supply facilities, and from sudden and unusual demands brought about by fire. The storage tends to stabilize the peaks in water demand and allows the system to produce water at a lower, more uniform rate. Water from storage is fed into the system either by gravity or by pumping from a booster station. Two types of reservoirs feed water into the system by gravity. These are classified either as ground reservoirs with the floor resting on the ground or as elevated reservoirs with columns supporting the tank. A ground reservoir may also be constructed at an elevation that requires a booster station to pump water into the system. Effective storage is defined as the storage available while still maintaining a sufficient residual pressure (generally within 30 feet to 40 feet of the high water level). All of Oak Park Heights's storage can be considered effective. A summary of the existing facilities is presented in Table 4. Both existing and proposed water storage locations are shown on the Water Distribution System Map at the back of this report. TABLE 4 3.3 DISTRIBUTION SYSTEM The existing distribution system consists of lines that vary in size from 4 inches to 12 inches in diameter. Water mains are all Ductile Iron Pipe (DIP) or Cast Iron Pipe (CIP). City of Oak Park heights ftyraft 55-06143-0 Water Supp/y and DistabrtionPlan ' Bonestroo 8 EXISTING STORAGE FACILITIES The existing system operates under three pressure zones. The respective static high water elevations for the High Zone, Intermediate Zone, and Low Zone are 1,083.8 feet, 1,001.0 feet, and 903 feet above sea level. Static pressure readings within these zones generally range from about 50 pounds per square inch (psi) to 90 psi throughout the system. Static water pressures based on the high water level in each zone can be found on the Static Water Pressure Map at the back of the report. 3.4 HYDRAULIC ANALYSIS A hydraulic analysis of Oak Park Heights's entire water supply and distribution system was conducted using computer modeling software. The results of this model are discussed in more detail in the next section. The first step in the process is to create a computer model of the existing supply and distribution system. The purpose of this model is to find any problems with the existing system and to serve as a foundation for a model of the entire system. Oak Park Heights's system was flow tested in various locations. The computer model was then run with the same conditions in an attempt to match the results. After several trials in which model characteristics are adjusted, it was possible to reasonably match the computed model results with the field test results. The test results matched well, indicating that the computer model accurately portrays Oak Park Height's system. 3.5 ADEQUACY OF EXISTING FACILITIES The existing water supply and distribution system for the City of Oak Park Heights meets the various current water demands placed on it. Phased improvements in the supply, storage, and distribution facilities have proven to be cost - effective and timely. The existing wells have met current supply needs. Generally, the existing storage facilities provide satisfactory static and residual pressures to most areas. The existing distribution system consists generally of properly sized mains that are capable of conveying water and fire flows to the needed areas. Modifications proposed to strengthen and expand the existing system are discussed in the following section. The analysis identified the following problem areas. • Backup Well. The City needs another well to serve as a backup. The existing maximum day demand (1,300 gpm) is much greater than the existing firm well capacity (800 gpm). Low Pressures. Junction 2110 (along State Highway 36, as shown on the map at the back of the report) was the only area with low (less than 40 psi) residual pressures. This is primarily due to high ground elevations for the corresponding pressure zones. • High Pressures. Much of the City on the east side of Osgood Avenue North and south of State Highway 36 has static pressure greater than 80 psi. When the water towers are rapidly filling these pressures can be higher. Although these pressures are fairly high, they are still considered acceptable. • Low Fire Flows. With a couple of exceptions, the entire City is able to meet the recommended fire flows. The Existing Fire Flow Map in Appendix B shows the fire flow projected by the model. Additionally, the City does not have sufficient supply and storage to fight a fire on a peak day. • Pressure Reducing Valves. Proper operation of the City's pressure reducing valves is essential. All of the water supplied to the Intermediate and Low pressure zones must come through pressure reducing valves. If the valves fail to close, extremely high pressures will occur in the lower elevation areas of the City. Therefore, the City needs a rigorous testing and maintenance program for all pressure reducing valves. City of Oak Park Heights #gonestroo Project& 55- 06143 -0 W aterSuppiyand Distribution P /an OAR PARR HEIGHTS - WATER SUPPLY AND DISTRIBUTION PLAN 4. Proposed Facilities 4.1 SUPPLY - STORAGE CONSIDERATIONS Supply capacity, storage volume, and distribution system capacity are interrelated. Tanks act as additional supply sources during peak periods when the primary supply source is incapable of meeting the demand. Thus, the storage tends to stabilize the peaks in water demand and allows the system to produce water at a lower, more uniform rate. Ideally, the distribution system should be capable of carrying the flows from both the supply sources and the tanks without allowing pressures to drop below approximately 40 psi. Static pressure should be within a range of 40 psi to 90 psi, if possible. Static pressure is defined as the pressure available at the street when all the tanks are full and no one is using water. During fires or other emergencies, the pressure must not drop below 20 psi. The system must also be capable of conveying water from the supply source to the tanks for storage without allowing the development of high pumping heads and therefore high pressures in the system during low usage periods. There are an infinite number of combinations of supply and storage that can be used to meet peak water demands. An economical system can be obtained through an analysis of supply and storage costs. For the vast majority of communities, the ideal combination of supply and storage is found when the supply equals 100% of the maximum day demand. This is consistent with the recommendations in both Recommended Standards for Water Works by Great Lakes Upper Mississippi River Board, and American Water Works Manual of Practice M32 - Distribution Network Analysis for Water Utilities The amount of storage required for Oak Park Heights's water system is determined from the maximum day demand variation curve. This curve was developed by evaluating the well and storage operation during maximum demand days for a typical Minnesota community, and is presented in Figure 1. This curve should be checked with future peak days. City of Oak Park Heights Proyeaft 55- 06143 -0 WaWSupp,yandDisw&0on Plan # Bonestroo 10 FIGURE 1 MAXIMUM DAY DEMAND CURVE a E g T R Q A E O C b b 4 The shadowed area above the maximum day demand line in Figure 2 represents 18% of the maximum total day demand. This volume of water takes into account hourly fluctuations and is provided by storage facilities. In addition, a safety factor is required to account for fire flows, unusual demands on the system and operational concerns. This safety factor is estimated to be 12% of the maximum day total demand, and is based on a 3,500 gpm fire flow sustained for 3 hours and on actual operating levels in the reservoirs being 2 or 3 feet lower than the high water level. Effective storage is considered to be water available for use at an adequate residual pressure (not lower than 40 feet below the system high water level). 4.2 HYDRAULIC ANALYSIS The Oak Park Heights water system was analyzed in detail using a hydraulic computer model. The model describes the entire system, including wells, tanks, and distribution mains. Input for the computer model includes pipe sizes and lengths, point supplies and demands, storage tank characteristics, and ground elevations all entered in a CAD drawing. The model then computes data for various times of the day based on the demand curve. These data include pipe flows and velocities, energy losses, pressures at each demand point, pumping rates, and storage tank levels. Analysis of this data facilitates the design of an economical and adequate water system. Results of this analysis and recommendations for improvements are presented later in the report. City o /Oak Park Heights Project No 55 05143 0 We ter Supply and Distdbution Plan # Bonestroo 11 Time of Day (hr) an 4.3 RAW WATER SUPPLY WELLS REQUIRED A total firm production capacity of 23 MGD (1,600 gpm) is required to meet the demand conditions in Oak Park Heights at build -out of the Ultimate study area. This represents 100% of the ultimate system's maximum day demand. Providing a firm capacity equal to the maximum day demand will result in improved system reliability by enhancing performance during the tank - filling periods, and particularly in the event of an emergency such as a fire. Peak demands will be supplied by storage on the system. As discussed in the previous section, Oak Parks Heights needs a third well immediately. This well will bring the total firm capacity to 1,700 gpm. To reach the total required firm capacity of 2,000 gpm, we recommend that existing Wells 1 and 2 be redeveloped to achieve at least 1,000 gpm each. The calculations to justify these recommendations are shown below. Well Suooly Reouirements Required Firm Capacity ...... ..........................1,600 gpm Existing Firm Capacity ...... ............................... 800 gpm Required Additional Capacity .......................... 800 gpm Drill one additional 1,000 gpm well Additionally, Wells 1 and 2 should be redeveloped to achieve at least 1,000 gpm each the next time the well pumps are pulled for maintenance. WELLHEAD PROTECTION AND SUSTAINARILITY OF THE AQUIFER There have been no interference or contamination problems with the City's two existing wells. The City has completed their wellhead protection plan in accordance with Minnesota Department of Health rules. Finding a suitable location for future Well 3 is challenging, due to existing contamination south of the City. 4.4 WATER TREATMENT The City of Oak Park Heights presently obtains its raw water supply from deep wells into the Jordan Sandstone aquifer. Water obtained from the wells in Oak Park Heights is generally considered to be safe from pathogenic or disease - causing organisms. Currently, the City's iron and manganese concentrations are low enough so that further treatment is not necessary. Iron and manganese precipitates from the water and accumulates in the distribution system, particularly in areas of low demands. When demand increases or when the system is interrupted for some reason, red water problems occur which cause staining of washed clothing and plumbing fixtures. Customer complaints can be minimized by frequent flushing and cleaning of lines in problem areas. Because of public complaints and/or high maintenance costs, iron and manganese treatment may some day become necessary. Oak Park Heights's water is also considered hard, with an average hardness of 210 mg /L. Although softening can be accomplished at the water treatment plant, it is generally most cost effective to treat with in -home softeners. The City should begin disinfecting their water supply. This is commonly done at the well with chlorine gas. City of Oak Park Heights Project No: 55- 06143 -0 WaterSWpP andDistabation Plan ' Bonestroo 12 4.5 STORAGE The existing storage sites for the Oak Park Heights water distribution system are shown on the Water Distribution System Map at the back of this report. The City's existing storage (a total of 0.75 million gallons) is slightly less than the required storage for full build out of the Study Area. This report assumes that sufficient well capacity will be obtained to make up for this storage deficit and that no additional storage sites are required. The amount of storage required may be increased or reduced depending on population, water usage patterns, and conservation measures. 4.6 DISTRIBUTION SYSTEM GENERAL The proposed distribution system for the City of Oak Park Heights is presented on the Water Distribution System Map at the back of this report. The system covers the entire City and reflects changes to previous reports and layouts. A strong network of trunk water mains is planned to extend in every direction from these sites. Major water mains connect the storage tanks and are looped throughout the system in order to provide reliable service. Because the City's topography ranges considerably, it is recommended that three pressure zones be maintained, It is desirable to provide a static pressure range of 50 psi to 80 psi (pounds per square inch) throughout the maximum demand day. Static pressure is defined as the pressure available at street level when all the tanks are full and no one is using water. Homes with a static pressure of greater than 80 psi should be required to install individual pressure reducing valves. Homes with a static water pressure less than 50 psi may desire in -home booster stations. Under emergency conditions, pressures must be maintained above 20 psi. The high water levels for the three pressure zones are as follows: High Zone ........................ 1,083.8 Intermediate Zone ............ 1,001.0 Low Zone ............................ 903.0 The high water level of the Low Zone is set to match the MCF- Stillwater and Bayport water towers. It is desirable to provide interconnections to these systems to provide a redundant source of water for the Low Zone in the event of an emergency, Pressure Reducing Valves (PRVs) will be needed between the pressure zones for redundancy and to provide supplementary fire flows to the lower zones. HYDRAULIC ANALYSIS Hydraulic analysis of the distribution system was performed by a computer program. The program computes flows and residual pressures which were then analyzed to locate problem areas. Water main sizes, storage tank characteristics, and pump controls were then revised and the program was run again until the problem was corrected. CgyofOak Park Heights Project No: 55- 06143 -0 Water Supply and Distabution Plan # Bonestroo 13 The time simulation computer analysis was used to design and analyze the performance of the ultimate water system during the maximum demand day. The types of alternatives that were evaluated during multiple computer runs can be grouped into three categories: 1. Changes in size and location of the projected elevated tanks. 2. Changes in diameter of the proposed water mains. 3. Addition of new water mains. After evaluating the different alternatives, the selected best option was a trade -off between the following parameters: 1. Tank Operation: Includes minimum level, ending level, and total operation time for each tank. 2. High Pressure Nodes: Identify high pressure nodes during low demand (tank - filling) periods. 3. Low Pressure Nodes: Identify low pressure nodes during high demand periods. 4. High Headloss Lines: Find pipes with unusually high headloss per thousand feet that need to be replaced, paralleled, or redesigned. 5. Fire Flows: Make sure that all nodes in the distribution system are able to get sufficient fire flows while maintaining a minimum residual pressure of 20 psi. The ultimate system shown on the Water Distribution System Map at the back of the report is generally able to meet all of the above criteria. These results are discussed in more detail in the following paragraphs. Low Pressure Areas: Several areas in the City have low pressures simply because they are at high ground elevations. For a graphical representation of these areas, see the Static Water Pressure Map in Appendix E. • High Pressure Areas: Several areas in the City have high pressure due to being at low elevations. Areas with high static pressures (greater than 80 psi) should have individual home pressure reducing valves. Refer to the Static Water Pressure Map in Appendix E for a graphical depiction of high pressure areas. • Fire Flows: All areas, except as noted on the Ultimate Fire Flow Map in Appendix B, are able to meet or exceed the recommended fire flows while maintaining 20 psi residual pressure. 4.7 WATER SYSTEM PHASING The projected served population for the Oak Park Heights water system at build -out of the 2030 study areas is 5,700. Near term needs include a back -up well. Trunk distribution pipe should be added as development occurs. City of Oak Park Heights Pr %aft.. 55- 06143 -0 Water Suppty and Orsmbution Plan . BM*St= 14 OAK PARK HEIGHTS - WATER SUPPLY AND DISTRIBUTION PLAN 5. Economic Analysis 5.1 COST ESTIMATES One of the basic objectives of this report was to determine the cost of completing Oak Park Heights's water supply and distribution system. The cost estimates presented in this report were based on current construction costs and can be related to the value of the ENR (Engineering News Record) Index for Construction Costs of approximately 8089 (December 2007). Future changes in this index are expected to reflect cost changes in the proposed facilities. During interim periods, between full evaluation of projected costs, capital recovery procedures can be related to this index. A summary of the estimated total construction costs of future water supply, treatment, storage, and trunk distribution facilities is presented in Table 5. Appendix C contains a more detailed cost estimate. TABLES TRUNK WATER SYSTEM COST SUMMARY Comp onent System Su I - — Total Cost $1,450,000 Treatment 0 Storage 0 Distribution $1,840,000 Total Ultimate System Cost $3,290,000 5.2 WATER SYSTEM TRUNK CHARGES The current policy of the City of Oak Park Heights is to finance trunk water supply, storage, and distribution costs with connection charges and area charges. These charges are reviewed and adjusted annually, according to the ENR construction cost index. City of Oak Park Heights ProI&I No: 55- 06143-0 WaterSuppl Plan 113weSt1'00 15 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Appendix A— Water Supply Plan (Emergency and Conservation Plan) City of Oak Park Heights Water 5uppty andOishibuPon Plan # Bonestroo Project No: 55- 06143-0 16 DEPARTMENT OF NATURAL RESOURCES - DIVISION OF WATERS and METROPOLITAN COUNCIL WATER EMERGENCY AND CONSERVATION PLANS These guidelines are divided into four parts. The first three parts, Water Supply System Description and Evaluation, Emergency Response Procedures and Water Conservation Planning apply statewide. Part IV, relates to comprehensive plan requirements that apply only to communities in the Seven - County Twin Cities Metropolitan Area. If you have questions regarding water emergency and conservation plans, please call (651) 259 -5703 or (651) 259 -5647 or e-mail your question to wateru se(a),dnr. state. mn.us Metro Communities can also direct questions to the Metropolitan Council at watersuppby2metc.state.mn.us or (651) 602 -1066. DNR Water Appropriation Permit Number (s 75-6123 Name of Water Supplier City of Oak Park Heights, MN Address P.O. Box 2007 Oak Park Heights 55082 Contact Person Tom Ozzello Title Public Works Director Phone Number 1 651 439 -4439 E -Mail Address I tozzello @cityofoakparkheights.com PART I. WATER SUPPLY SYSTEM DESCRIPTION AND EVALUATION The first step in any water supply analysis is to assess the current status of demand and supplies. Information in Part I, can be used in the development of Emergency Response Procedures and Conservation Plans. A. ANALYSIS OF WATER DEMAND. Fill in Table 1 for the past 10 years water demand. If your customer categories are different than the ones listed in Table 1, please note the changes below. TABLE 1 Historic Water Demand • Year Total Population Population Served Total Connections Residential Water Sold C C/M Water Sold (MG) Wholesale Deliveries G Total Water Sold (MG) Total Water Pumped C Percent Unm etered/ Unaccounted Average Demand GD 1998 207.729 .5691 1999 4200 1128 119.359 67.545 0 186.904 210.718 11.3% .5773 2000 209.292 .5734 2001 4076 1287 105.211 96.678 0 201.889 219.049 7.8% .6001 2002 4291 1316 101.146 95.683 0 196.829 210.087 6.3% .5756 2003 4283 1212 132.884 76.251 0 209.135 235.303 11.1% .6447 2004 4529 1284 106.121 95.938 0 202.059 222.688 9.3% .6101 2005 4633 1277 104.893 107.35 0 212.242 223.896 5.2% .6134 2006 4664 1284 121.415 131.825 253.240 248.730 -- .6815 MG — Million Gallons MGD — Million Gallons per Day C/I/I- Commercial, Industrial, Institutional • Residential. Water used for normal household purposes, such as drinking, food preparation, bathing, washing clothes and dishes, flushing toilets, and watering Institutional. Hospitals, nursing homes, day care centers, and other facilities that use water for essential domestic requirements. This includes public facilities • maintain separate institutional water use records for emergency planning and allocation purposes. . Commercial. Water used by motels, hotels, restaurants, office buildings, commercial facilities, both civilian and military. • Industrial. Water used for thermoelectric power (electric utility generation) and other industrial uses such as steel, chemical and allied products, food processing petroleum refining. Wholesale Deliveries. Bulk water sales to other public water suppliers. • Unaccounted. Unaccounted for water is the volume of water withdrawn from all sources minus the volume sold. • Residential Gallons per Capita per Day = total residential sales in gallons /population served/365 days Total Gallons per Capita per Day = total water wi• NOTE: Noncsscntial water uses defined by Minnesota Statutes 103G.291, include lawn sprinkling, vehicle washing, golf course and park irrigation and other categories also include nonessential uses of water. • • • • • Water Use Trends. Discuss factors that influence trends in water demand (i.e. growth, weather, industry, conservation). If appropriate, include a discussion of other factors that affect daily water use, such as use by non - resident commuter employees or large water consumin industry. Oak Park Heights is an established community with a growing population base, and additional commercial/industrial development. Water use will increase with additional residential and commercial/industrial development. As is common for Metro area communities, water use is highest in the summer months, primarily due to lawn sprinkling. Oak Park Heights has several large users that constitute a significant portion of Oak Park Heights' daily water pumpage, as shown in Table 2. Water conservation measures enacted since the 1998 plan have had an effect on water use patterns in the city — primarily in reducing the peak day water useage. Note: Water sold in 2006 exceeds production for 2 reasons: First, City has a minimum billable volume for each customer. Second, the City had a corrective bill at the end of 2006 that cleared an extra month (13) for the year. TABLE 2 Large Volume Users - List the top 10 largest users. Customer Gallons per year millions % of total annual use Presbyterian HomesNSSA 7.42 2.9 MN Correctional Facility 23.79 9.4 Washington County & Law Enforcement Center 43.75 17.3 Stillwater Area High School 5.09 2.0 Car Wash Partners (Osgood @ TH36 4.27 1.7 Sunn Side Marina A is 2.48 1.0 Raymie Johnson Estates /A is 2.74 1.1 St. Croix Cleaners 2.48 1.0 Oak Park Ponds 3.76 1.5 Oak Park A is 2.37 0.9 B. TREATMENT AND STORAGE CAPACITY. TABLE NA) Water Treatment Water Treatment Plant Capacity NA Gallons per da Describe the treatment process used (ie, softening, chlorination, fluoridation, Fe/Mn removal, reverse osmosis, coagulation, sedimentation, filtration, others). Also, describe the annual amount and method of disposal of treatment residuals if any. Oak Park Heights has no treatment at this time. Fluoride is added at each of the wells. TABLE 3(B) Storage Capacity - List all storaee structures and canacities. Total Storage Ca acity Average Day Demand averse of last 5 ears 750,000 Gallons 610,000 Gallons per day Type of Structure Number of Structures Gallons Elevated Storage City Hall West 250,000 500,000 Ground Storage NA Diameter Other: NA C. WATER SOURCES. List all groundwater, surface water and interconnections that supply water to the system Add or delete lines to the tables as needed. TABLE 4(A) Total Water Source Capacity for Svstem (excludine emergencv connections) Total Capacity jUniqueWeRl of Sources 1 1700 Gallons per minute Firm Ca aci (largest pump out of service 850 Gallons per minute TABLE 4(B) Groundwater Sources - Copies of water well records and well maintenance information should be included with the public water supplier's copy of the plan in Attachment . If there are more wells than space provided or multiple well fields, please use the List of Wells template (see Resources) and include as Attachment Well (1 jUniqueWeRl Year Wei & V ell Capacity Geologic Unit Status or name Number In Casing Diameter (GPM) Depth ft in 1 208794 1968 3101230 16 850 Jordan Active 2 112205 1975 2911230 16 850 Jordan Active Status: Active use, Emergency, Standby, Seasonal, Peak use, etc. GPM — Gallons per Minute Geologic Unit: Name of formation(s), which supplies water to the well TABLE 4(C) Surface Water Sources Intake ID Resource name Capacity GPM/MGD NA GPM — Gallons per Minute MGD — Million Gallons per Day TABLE 4(D) Wholesale or Retail Interconnections - List interconnections with neighboring sunnliers that are used to sunnly water on a regular basis either wholesale or retail. Water Supply System Capacity GPM /MGD Wholesale or retail GPM — Gallons per Minute MGD — Million Gallons per Day 11 TABLE 4(E) Emergency Interconnections - List interconnections with neighboring suppliers or private sources that can be used to supply water on an emergency or occasional basis. Suppliers that serve less than 3,300 people can leave this section blank, but must provide this information in Section II C. Water Supply System Capacity GPM/MGD Note any limitations on use Stillwater — at 65` and 62n 0.5 MGD Hydrant to hydrant connections 4633 0.61 1.86 222.6 2006 4800 GPM — Gallons per Minute MGD — Million Gallons per Day D. DEMAND PROJECTIONS. TABLE 5 Ten Year Demand Proiections Year Population Served Average Day Demand (M GD) Maximum Day Demand (MGD) Projected Demand MG 2005 4633 0.61 1.86 222.6 2006 4800 0.64 1.9 234 2007 4980 0.66 2.0 241 2008 5150 0.69 2.1 252 2009 5330 0.71 2.1 259 2010 5500 0.73 2.2 268 2015 5550 0.74 2.2 269 MGD — Million Gallons per Day MGY — Million Gallons per Year Projection Method. Describe how projections were made, (assumptions for per capita, per household, per acre or other methods used). Population served projections from City Comprehensive Plan. Water use projections from a combination of per capita water use calculations and consideration of land use expected to develop in the next ten years. 5 E. RESOURCE SUSTAINABILITY Sustainable water use: use of water to provide for the needs of society, now and in the future, without unacceptable social, economic, or environmental consequences. Monitoring. Records of water levels should be maintained for all production wells and source water reservoirs/basins. Water level readings should be taken monthly for a production well or observation well that is representative of the wells completed in each water source formation. If water levels are not currently measured each year, a monitoring plan that includes a schedule for water level readings must be submitted as Attachment TABLE 6 Monitoring Wells - List all wells being measured. Unique well number Type of well (production, observation Frequency of Measurement (daily, monthly etc Method of Measurement (steel tape, SCADA etc. 208794 Production Periodic Drexlebrook 112205 Production Periodic Steel to e Water Level Data. S ummariz e water level data including seasonal and long -term trends for each ground and/or surface water source. If water levels are not measured and recorded on a routine basis then provide the static water level (SWL) when the well was constructed and a current water level measurement for each production well. Also include all water level data taken during well and pump maintenance. Water levels are currently measured periodically — primarily due to a lack of calibrated instrumentation at the wells. Well 1 has an older Drexlebrook device, but there are no records of when it was last calibrated. Well 2 does not have an electronic measuring device, and is only measured when the pump is down. With future well pump rehab projects, new calibrated electronic water level devices will be installed. Attachment 1: Pro vide monitoring data (graph or table) for as many years as possible. Ground Water Level Monitoring — DNR Waters in conjunction with federal and local units of government maintain and measure approximately 750 observation wells around the state. Ground water level data are available online wwwAmstate.mn.us/waters Information is also available by contacting the Ground Water Level Monitoring Manager, DNR Waters, 500 Lafayette Road, St. Paul, MN 55155 -4032 or call (651) 259 -5700. Natural Resource Impacts. Indicate any natural resource features such as calcareous fens, wetlands, trout streams, rivers or surface water basins that are or could be influenced by water withdrawals from municipal production wells. Also indicate if resource protection thresholds have been established and if mitigation measures or management plans have been developed. NA Sustainability. Evaluate the adequacy of the resource to sustain current and projected demands. Describe any modeling conducted to determine impacts of projected demands on the resource. The City of Oak Park Heights completed their Wellhead Protection Plan for Well Dios. 1 and 2 in the year 2002. The plan delineates the 10 -year capture zone for the City's wells and determines the level of vulnerability of the aquifer to contamination. For the Prairie du Chien - Jordan aquifer, the level of vulnerability is considered to be "high" in the Oak Park Heights area. This is based on the lack of thick, continuous layers of low permeability sediments such as clays or shales between the surface and the aquifer. Also, age dating testing of the water indicated the presence of "recent" water (less than 50 years old) in the City's wells, meaning contaminants at the surface may reach the aquifer in a relatively short time if allowed to directly infiltrate. The plan established goals to manage the wellbead protection area. These goals include raising awareness of aquifer protection measures among owners of sites that contain potential sources of contamination. Public education goals were also established to minimiz impacts from overuse of lawn and garden chemical and to avoid improper disposal of household hazardous wastes. The Wellhead Protection Plan will remain in effect in it's current form until 2012 or whenever the City installs it's next water supply well. At that time, the City will be required to update the plan. The sustainability of the Prairie du Chien - Jordan aquifer in the Oak Park Heights area will depend on two factors: 1. Growth in the area. As Oak Park Heights and Stillwater continue to grow, increased water demand will result in an increased need for more wells to meet that demand. While the Prairie du Chien - Jordan aquifer is shallow enough to receive recharge from precipitation and surface waters, an increased number of wells may result in well interference issues if wells are placed too closely to each other. Before siting future well locations, a more in -depth analysis of potential well interference issues should be undertaken. 2. Contamination to the aquifer. The higher vulnerability of the aquifer to contamination increases the chances of water quality being impacted from human- caused spills or leaks. The Baytown Township, south of Oak Park Heights, is the site of a large contamination plume of volatile organic compounds (VOCs). Contamination of the aquifer extends from the area near the Lake Elmo airport eastward towards the St. Croix River. Trichloroethelene (TCE) has been detected in domestic drinking water wells in the area immediately south of Oak Park Heights. While it is thought that the eastward gradient of groundwater flow will probably prevent TCE contamination from impacting Oak Park Heights' existing municipal water supply wells, the MDH has indicated that placement of future municipal water supply wells south of the existing wells likely won't be approved. As such, placement of future City wells will need to take into account the proximity of the plume and the MDH will likely require an analysis to indicate that any future wells : 1) will not pump water with contamination above the regulated standards, and 2) will not change groundwater flow gradient as such to promote migration of the plume further north than where it is currently observed. Source Water Protection Plans. The emergency procedures in this plan are intended to comply with the contingency plan provisions required in the Minnesota Department of Health's (MDH) Wellhead Protection Plan and Surface Water Protection (SWJ Plan. Date WHP Plan Adopted: 2002 Date for Next WHP Update: SWP Plan: I LJ In Process Z Completed LJ Not Applicable F. CAPITAL IMPROVEMENT PLAN (CIP) Adequacy of Water Supply System. Are water supply installations, treatment facilities and distribution systems adequate to sustain current and projected demands? ® Yes ❑ No If no, describe any potential capital improvements over the next ten years and state the reasons for the proposed changes (CIP Attachment ). City needs a back -up well. Wells 1 and 2 will be redeveloped in conjunction with their normal well pump repair cycles. Proposed Water Sources. Does your current CIP include the addition of new wells or intakes? ® Yes ❑ No If yes, list the number of new installations and projected water demands from each for the next ten years. Plans for new production wells must include the geologic source formation, well location, and proposed pumping capa City needs a back -up well, with a capacity of 850 gpm. Water Source Alternatives. If new water sources are being proposed, describe alternative sources that were considered and any possibilities of joint efforts with neighboring communities for development of sunolies. City is working with MDH to site a new well. City is aware of water supply issues in Bayport and MCF- Stillwater. Preventative Maintenance. Long -term preventative programs and measures will help reduce the risk of emergency situations. Identify sections of the system that are prone to failure due to age, materials or other problems. This information should be used to prioritize capital improvements, preventative maintenance, and to determine the types of materials (pipes, valves, couplings, etc.) to have in stock to reduce repair time. Valves are checked occasionally as personnel are available. Hydrants are checked once each year. The City maintains records of all water main breaks and repairs. The City has an inventory of repair parts, valves, and sleeves at the Public Works Department. • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • PART H. EMERGENCY RESPONSE PROCECURES 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. If your community already has written procedures dealing with water emergencies we recommend that you use these guidelines to review and update existing procedures and water supply protection measures. 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. Community water suppliers that have completed the Federal Emergency Response Plan and submitted the required certification to the U.S. Environmental Protection Agency have satisfied Part II, Sections A, B, and C of these guidelines and need only provide the information below regarding the emergency response plan and source water protection plan and complete Sections D (Allocation and Demand Reduction Procedures), and E (Enforcement). Provide the following information regarding your completed Federal Emergency Response Plan: Emergency Response Plan Contact Person Contact Number Emergency Response Lead Tom Ozzello 651439-4439 Alternate Emergency Res onse Lead Emergency Response Plan Certification Date December 16, 2004 Operational Contingency Plan. An operational contingency plan that describes measures to be taken for water supply mainline breaks and other common system failures as well as routine maintenance is recommended for all utilities. Check here ® if the utility has an operational contingency plan. At a minim a contact list for contractors and supplies should be included in a water emergency telephone list. Communities that have completed Federal Emergency Response Plans should skip to Section D. EMERGENCY RESPONSE PROCEDURES A. Emergency Telephone List. A telephone list of emergency contacts must be included as Attachment to the plan (complete template or use your own list). The list should include key utility and community personnel, contacts in adjacent communities, and appropriate local, state and federal emergency contacts. Please be sure to verify and update the contacts on the emergency telephone list on a regular basis (once each year recommended). In the case of a municipality, this information should be contained in a notification and warning standard operating procedure maintained by the warning point for that community. Responsibilities and services for each contact should be defined. B. Current Water Sources and Service Area. Quick access to concise and detailed information on water sources, water treatment, and the distribution system may be needed in an emergency. System operation, water well and maintenance records should be maintained in a central secured location so that the records are accessible for emergency purposes and preventative maintenance. A detailed map of the system showing the treatment plants, water sources, storage facilities, supply limes, interconnections, and other information that would be useful in an emergency should also be readily available. Check here ❑ if these records and maps exist and staff can access the documents in the event of an emergency. C. Procedure for Augmenting Water Supplies. List all available sources of water that can be used to augment or replace existing sources in an emergency. In the case of a municipality, this information should be contained in a notification and warning standard operating procedure maintained by the warning point for that community. Copies of cooperative agreements should be maintained with your copy of the plan and include in Attachment Be sure to include information on any physical or chemical problems that may limit interconnections to other sources of water. Approvals from the MN Department of Health are required for interconnections and reuse of water. TABLE 7 (A) Public Water Supply Systems — List interconnections with other public water supply systems that can supply water in an emergency. Water Supply System Ca aci GPM/MGD Note any limitations on use Stillwater (at 65 and 62 °) Minimal Potential hydrant -to- hydrant connections in a few locations where Oak Park Heights and Stillwater have hydrants on opposite sides of the same street. GPM - Gallons per Minute MGD - Million Gallons per Day I ADur, / (l5J - rrlvare water Joarces — i isE older sources oI water avaname m an emerge IIC Name Capacity (GPM/MGD) Note anv limitations on use per per 10 • • • • • • • D. Allocation and Demand Reduction Procedures. The plan must include 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. During periods of limited water supplies public water suppliers are required to allocate water based on the priorities established in Minnesota Statutes 1O3G.261. Water Use Priorities (Minnesota Statutes 103G261) First Priority. Domestic water supply, excluding industrial and commercial uses of municipal water supply, and use for power production that meets contingency requirements. NOTE: Domestic use is defined (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. second Priority. Water uses involving consumption of less than 10,000 gallons per day. Third Priority. Agricultural irrigation and processing of agricultural products. Fourth Priority. Power production in excess of the use provided for in the contingency plan under first priority. Fifth Priority. Uses, other than agricultural irrigation, processing of agricultural products, and power production. Sixth Priority. Non - essential uses. These uses are defined by Minnesota Statutes 103G291 as lawn sprinkling, vehicle washing, golf course and park irrigation, and other non-essential uses. List the statutory water use priorities along with any local priorities (hospitals, nursing homes, etc.) in Table 8. Water used for human needs at hospitals, nursing homes and similar types of facilities should be designated as a high priority to be maintained in an emergency. Local allocation priorities will need to address water used for human needs at other types of facilities such as hotels, office buildings, and manufacturing plants. The volume of water and other types of water uses at these facilities must be carefully considered. After reviewing the data, common sense should dictate local allocation priorities to protect domestic requirements over certain types of economic needs. In Table 8, list the priority ranking, average day demand and demand reduction potential for each customer category (modify customer categories if necessary). 11 Table S Water Use Priorities Customer Category Allocation Priority Average Day Demand Demand Reduction ❑ Treatment Capacity GPD Potential GPD Residential 1 287,000 100,000 (assume ® Groundwater Levels ® minimum usage equals 4363 people at 40 cd Institutional (High I Priority) Presb. Homes, MCF, 40,000 (assume 20% Wash Co, 180,000 reduction possible) SAHS C/I/I (Not included 2 114,000 100,000 above Irrigation NA Wholesale NA Non - essential 6 1,300,000 gal (on Max 1,300,000 gal on Max Day) Day (equals Max Day minus Average Da TOTALS GPD — Gallons per Day Demand Reduction Potential. The demand reduction potential for residential use will typically be the base demand during the winter months when water use for nonessential uses such as lawn watering do not occur. The difference between summer and winter demands typically defines the demand reduction that can be achieved by eliminating non- essential uses. In extreme emergency situations lower priority water uses must be restricted or eliminated to protect first priority domestic water requirements. Short-term demand reduction potential should be based on average day demands for customer categories within each priority class. Triggers for Allocation and Demand Reduction Actions. Triggering levels must be defined for implementing emergency responses, including supply augmentation, demand reduction, and water allocation. Examples of triggers include: water demand >100% of storage, water level in well(s) below a certain elevation, treatment capacity reduced 10% etc. Each trigger should have a quantifiable indicator and actions can have multiple stages such as mild, moderate and severe responses. Check each trigger below that is used for implementing emergency responses and for each trigger indicate the actions to be taken at various levels or stages of severity in Table 9. ® Water Demand ❑ Water Main Break ❑ Treatment Capacity ❑ Loss of Production ❑ Storage Capacity ❑ Security Breach ® Groundwater Levels ® Contamination ❑ Surface Water Flows or Levels ❑ Other (list in Table 9) ® Pump, Booster Station or Well Out of Service ® Governor's Executive Order — Critical Water Deficiency (required by statute) 12 Table 9 Demand Reduction Procedures Condition Trigger(s) Actions Always Always Odd/Even Sprinkling Ban Voluntary Conservation Measures Stage 1 80% of Well Firm Prepare to notify customers (Mild) Capacity (1.0 MGD) for more than 5 consecutive days Stage 2 90% of firm capacity (I. I Notify customers and encourage additional (Moderate) MGD) for more than 2 voluntary reductions in non - essential uses. consecutive days Stage 3 80% of firm capacity (1.0 Critical Water Deficiency (see restrictions below) (Severe) MGD) for more than 2 consecutive days AND failure of one well pump or significant drop in groundwater levels - -- OR - -- 80% of firm capacity (1.0 MGD) for more than 10 consecutive da Critical Water Executive Order by Stage 1: Restrict lawn watering, vehicle washing, Deficiency Governor & as provided golf course and park irrigation and other (M.S. 103G.291) in above triggers nonessential uses Stage 2: Suspend lawn watering, vehicle washing, golf course and park irrigation and other nonessential uses Note: The potential for water availability problems during the onset of a drought are almost impossible to predict. Significant increases in demand should be balanced with preventative measures to conserve supplies in the event of prolonged drought conditions. Notification Procedures. List methods that will be used to inform customers regarding conservation requests, water use restrictions, and suspensions. Customers should be aware of emergency rocedures and responses that they may need to implement. Official publication, direct mailing, door hangers, door -to -door notification, radio /TV 13 E. Enforcement. Minnesota Statutes require public water supply authorities to adopt and enforce water conservation restrictions during periods of critical water shortages. c Water Supply Appropriation During Deficiency. Minnesota Statutes 1036.291, Subdivision 1. Declaration and conservation. (a) 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. (b) The restrictions must limit lawn sprinkling, vehicle washing, golf course and park irrigation, and other nonessential uses, and An ordinance that has been adopted or a draft ordinance that can be quickly adopted to comply with the critical water deficiency declaration must be included in the plan (include with other ordinances in Attachment 7 for Part III, Item 4). Enforcement responsibilities and penalties for non - compliance should be addressed in the critical water deficiency ordinance. Sample regulations are available at www.dnr.state.mn.us /waters Authority to Implement Water Emergency Responses. Emergency responses could be delayed if city council or utility board actions are required. Standing authority for utility or city managers to implement water restrictions can improve response times for dealing with emergencies. Who has authority to implement water use restrictions in an emergency? ❑ Utility Manager ❑ City Manager ® City Council or Utility Board ❑ Other (describe): Emergency Preparedness. If city or utility managers do not have standing authority to implement water emergency responses, please indicate any intentions to delegate that authority. Also indicate any other measures that are being considered to reduce delays for implementing City is considering modifying their ordinances to give the City Administrator and Public Works Director the authority to implement water emergency response procedures. Additionally, City is considering ways to reduce delays in providing notification to customers. 14 PART M. WATER CONSERVATION PLAN Water conservation programs are intended to reduce demand for water, improve the efficiency in use and reduce losses and waste of water. Long -term conservation measures that improve overall water use efficiencies can help reduce the need for short-term conservation measures. Water conservation is an important part of water resource management and can also help utility managers satisfy the ever - increasing demands being placed on water resources. Minnesota Statutes 103G.291, requires public water suppliers to implement demand reduction measures before seeking approvals to construct new wells or increases in authorized volumes of water. Minnesota Rules 6115.0770, require water users to employ the best available means and practices to promote the efficient use of water. Conservation programs can be cost effective when compared to the generally higher costs of developing new sources of supply or expanding water and/or wastewater treatment plant capacities. A. Conservation Goals. The following section establishes goals for various measures of water demand. The programs necessary to achieve the goals will be described in the following section. Unaccounted Water calculate five year averages with data from Table 1 Average annual volume unaccounted water for the last 5 ye ars allons Average percent unaccounted water for the last 5 years 1 8 percent AW WA recommends that unaccounted water not exceed 10 %. Describe goals to reduce unaccounted water if the averse of the last 5 years exceeds 10 %. Residential Gallons Per Capita Demand GPCD Average residential GPCD use for the last 5 years use data from Table 1 GPCD In 2002, average residential GPCD use in the Twin Cities Metropolitan Area was 75 GPCD. Describe goals to reduce residential demand if the averse for the last 5 years exceeds 75 GPCD. Total Per Capita Demand: From Table 1, is the trend in overall per capita demand over the past 10 years ❑ increasing or ❑ decreasing? If total GPCD is increasing, describe the goals to lower overall per capita demand or explain the reasons for the increase. Peak Demands calculate average ratio for last five years usmi data from Table 1 Average maximum day to averse day ratio If peak demands exceed a ratio of 2.6, describe the goals for lowering peak demands. 15 B. Water Conservation Programs. Describe all short-term conservation measures that are available for use in an emergency and long -term measures to improve water use efficiencies for each of the six conservation program elements listed below. Short-term demand reduction measures must be included in the emergency response procedures and must be in support of, and part of, a community all- hazard emergency operation plan. Metering. The American Water Works Association (AWWA) recommends that every water utility meter all water taken into its system and all water distributed from its system at its customer's point of service. An effective metering program relies upon periodic performance testing, repair, repair and maintenance of all meters. AW WA also recommends that utilities conduct regular water audits to ensure accountability. Complete Table 10 (A) regarding the number and maintenance of customer meters. TABLE 10 (A) Customer Meters Unmetered Systems. Provide an estimate of the cost to install meters and the projected water savings from metering water use. Also indicate any plans to install meters. TABLE 10 (B) Water Source Meters Number of Connections Number of Metered Connections Meter testing schedule (years) Average age /meter replacement schedule s Residential schedule ears schedule ears Water Source / Institutional / wells/intakes / Commercial Treatment Plant / Industrial / Public Facilities / Other / TOTALS Unmetered Systems. Provide an estimate of the cost to install meters and the projected water savings from metering water use. Also indicate any plans to install meters. TABLE 10 (B) Water Source Meters 16 Number of Meter testing Average age /meter replacement Meters schedule ears schedule ears Water Source / wells/intakes Treatment Plant / 16 Unaccounted Water. Water audits are intended to identify, quantify, and verify water and revenue losses. The volume of unaccounted -for water should be evaluated each billing cycle. The AWWA recommends a goal of ten percent or less for unaccounted -for water. Water audit procedures are available from the AWWA and MN Rural Water Association. Frequency of water audits: ❑ each billing cycle ❑ yearly ❑ other: Leak detection and survey: ❑every year ❑ every years ❑ periodic as needed Year last leak detection survey completed: Reducing Unaccounted Water. List potential sources and efforts being taken to reduce unaccounted water. If unaccounted water exceeds 10% of total withdrawals, include the timeframe for completing work to reduce unaccounted water to 10% or less. Metering and better accounting of estimated uses for flushing, etc. 3. Conservation Water Rates. Plans must include the current rate structure for all customers and provide information on any proposed rate changes. Discuss the basis for current price levels and rates, including cost of service data, and the impact current rates have on conservation. Billing Frequency: ❑ Monthly ❑ Bimonthly ® Quarterly ❑ Other (describe): Volume included in base rate or service charge: gallons or cubic feet Conservation Rate Structures ® Increasing block rate: rate per unit increases as water use increases ❑ Seasonal rate: higher rates in summer to reduce peak demands ❑ Service charge or base fee that does not include a water volume Conservation Neutral Rate Structure ❑ Uniform rate: rate per unit is the same regardless of volume Non - conserving Rate Structures ❑ Service charge or base fee that includes a large volume of water ❑ Declining block rate: rate per unit decreases as water use increases ❑ Flat rate: one fee regardless of how much water is used (unmetered) Other (describe): Water Rates Evaluated: ❑ every year ❑ every years ❑ no schedule Date of last rate change: 17 Declining block (the more water used, the cheaper the rate) and flat (one fee for an unlimited volume of water) rates should be phased out and replaced with conservation rates. Incorporating a seasonal rate structure and the benefits of a monthly billing cycle should also be considered along with the development of an emergency rate structure that could be quickly implemented to encourage conservation in an emergency. Current Water Rates. Include a copy of the actual rate structure in Attachment or list current water rates including base /service fees and volume charges below. Non - conserving Rate Structures. Provide justification for the rate structure and its impact on reducing demands or indicate intentions including the timeframe for adopting a conservation rate 4. Regulation. Plans should include regulations for short-term reductions in demand and long -term improvements in water efficiencies. Sample regulations are available from DNR Waters. Copies of adopted regulations or proposed restrictions should be included in Attachment of the plan. Indicate any of the items below that are required by local regulations and also indicate if the requirement is applied each year or just in emergencies. ❑ Time of Day: no watering between am/pm and am/pm (reduces evaporation) ❑ year around ❑ seasonal ❑ emergency only ❑ Odd/Even: (helps reduce peak demand) ❑ year around ❑ seasonal ❑ emergency only ❑ Water waste prohibited (no runoff from irrigation systems) Describe ordinance: ❑ Limitations on turf areas for landscaping (reduces high water use turf areas) Describe ordinance: ❑ Soil preparation (such as 4 " -6" of organic soil on new turf areas with sandy soil) Describe ordinance: ❑ Tree ratios (plant one tree for every square feet to reduce turf evapotranspiration) Describe ordinance: ❑ Prohibit irrigation of medians or areas less than 8 feet wide Describe ordinance: ❑ Permit required to fill swimming pool ❑ every year ❑ emergency only ❑ Other (describe): State and Federal Regulations (mandated) 18 ❑ Rainfall sensors on landscape irrigation systems. Minnesota statute 103G.298 requires "AD automatically operated landscape irrigation systems shall have famished and installed technology that inhibits or interrupts operation of the landscape irrigation system during periods of sufficient moisture. The technology must be adjustable either by the end user or the professional practitioner of landscape irrigation services." ❑ Water Efficient Plumbing Fixtures. The 1992 Federal Energy Policy Act established manufacturing standards for water efficient plumbing fixtures, including toilets, urinals, faucets, and aerators. Enforcement. Are ordinances enforced? ❑ Yes ❑ No If yes, indicate how ordinances are enforced along with any penalties for non - compliance. 19 5. Education and Information Programs. Customers should be provided information on how to improve water use efficiencies a minimum of two times per year. Information should be provided at appropriate times to address peak demands. Emergency notices and educational materials on how to reduce water use should be available for quick distribution during an emergency. If any of the methods listed in the table below are used to provide water conservation tips, indicate the number of times that information is provided each year and attach a list of education efforts used for the last three years. Current Education Programs Times/Year Billing inserts or tips printed on the actual bill Consumer Confidence Reports Local news papers Community news letters Direct mailings water audit/retrofit kits, showerheads, brochures Information at utility and public buildings Public Service Announcements Cable TV Programs Demonstration projects Gandscaping or plumbin K -12 Education programs (Project Wet, Drinking Water Institute School presentations Events children's water festivals, environmental fans Community education Water Week promotions Information provided to groups that tour the water treatment p lant Website include address: Targeted efforts (large volume users, users with large increases Notices of ordinances include tips with notices Emergency conservation notices (recommended Other: List education efforts for the last three years in Attachment of the plan Be sure to indicate whether educational efforts are on -going and which efforts were initiated as an emergency or drought management effort. Proposed Education Programs. Describe any additional efforts planned to provide conservation information to customers a minimum of twice per year (required if there are no current efforts). A packet of conservation tips and information can be obtained by contacting DNR Waters or the Minnesota Rural Water Association (MRWA). The American Water Works Association (AW WA) www.awwa.ore or www.waterwiser,ore also has excellent materials on water conservation that are available in a number of formats. You can contact the MRWA 800/367-6792, the AW WA bookstore 800/926 -7337 or DNR Waters 651/259 -5703 for information regarding educational materials and formats that are available. PTO] 6. Retrofitting Programs. Education and incentive programs aimed at replacing inefficient plumbing fixtures and appliances can help reduce per capita water use as well as energy costs. It is recommended that communities develop a long -term plan to retrofit public buildings with water efficient plumbing fixtures and that the benefits of retrofitting be included in public education programs. You may also want to contact local electric or gas suppliers to see if they are interested in developing a showerhead distribution program for customers in your service area. A study by the AW WA Research Foundation (Residential End Uses of Water, 1999) found that the average indoor water use for a non - conserving home is 69.3 gallons per capita per day (gpcd). The average indoor water use in a conserving home is 45.2 gpcd and most of the decrease in water use is related to water efficient plumbing fixtures and appliances that can reduce water, sewer and energy costs. In Minnesota, certain electric and gas providers are required (Minnesota Statute 2166.241) to fund programs that will conserve energy resources and some utilities have distributed water efficient showerheads to customers to help reduce energy demands required to supply hot water. _ Retrofitting Programs. Describe any education or incentive programs to encourage the retrofitting of inefficient plumbing fixtures (toilets, showerheads, faucets, and aerators) or Plan Approval. Water Emergency and Conservation Plans must be approved by the Department of Natural Resources (DNR) every ten years. Please submit plans for approval to the following address: DNR Waters or Submit electronically to Water Permit Programs Supervisor wateruseL&dnr. state. mn.us 500 Lafayette Road St. Paul, MN 55155 -4032 Adoption of Plan. All DNR plan approvals are contingent on the formal adoption of the plan by the city council or utility board. Please submit a certificate of adoption (example available) or other action adopting the plan. Metropolitan Area communities are also required to submit these plans to the Metropolitan Council. Please see PART IV. ITEMS FOR METROPOLITAN AREA PUBLIC SUPPLIERS. 21 METROPOLITAN COUNCIL PART IV. ITEMS FOR METROPOLITAN AREA PUBLIC SUPPLIERS Minnesota Statute 473.859 requires water supply plans to be completed for all local units of government in the seven- county Metropolitan Area as part of the local comprehensive planning process. Much of the required information is contained in Parts I -III of these guidelines. However, the following additional information is necessary to make the water supply plans consistent with the Metropolitan Land Use Planning Act upon which local comprehensive plans are based. Communities should use the information collected in the development of their plans to evaluate whether or not their water supplies are being developed consistent with the Council's Water Resources Management Policy Plan. Policies. Provide a statement(s) on the principles that will dictate operation of the water supply utility: for example, "It is the policy of the city to provide good quality water at an affordable rate. while assuring this use does not have a lone -term negative resource imnact." Impact on the Local Comprehensive Plan. Identify the impact that the adoption of this water supply plan has on the rest of the local comprehensive plan, including implications for future growth of the community, economic impact on the community and changes to the comprehensive p lan that might result. Demand Projection! Year Total Community 2010 2020 2030 Population Average Day Maximum Projectei Served Demand I Day Demand Demand Population projections should be consistent with those in the Metropolitan Council's 2030 Regional Development Framework or the Communities 2008 Comprehensive Plan update. If population served differs from total population, explain in detail why the difference (ie, service to other communities, not complete service within community etc.). PLAN SUBMITTAL AND REVIEW OF THE PLAN The plan will be reviewed by the Council according to the sequence outlined in Minnesota Statutes 473.175. Prior to submittal to the Council, the plan must be submitted to adjacent governmental units for a 60 -day review period. Following submittal, the Council determines 22 if the plan is complete for review within 15 days. If incomplete, the Council will notify the community and request the necessary information. When complete the Council will complete its review within 60 days or a mutually agreed upon extension. The community officially adopts the plan after the Council provides its comments. Plans can be submitted electronically to the Council; however, the review process will not begin until the Council receives a paper copy of the materials. Electronic submissions can be via a CD, 3 %z" floppy disk or to the email address below. Metropolitan communities should submit their plans to: Reviews Coordinator Metropolitan Council 230 E 5 th Street, St. Paul, MN 55101 electronically to: watersupplly(ce,metc. state.mn. us 2:3 Appendix B - Model Results Qv of Oak Park Neights Project No.' 55- 06143 -0 Water Supply and Ourfibution Plan . BMW= 17 0. 0* 000000000000000000000000000000000000000• rn Q `1 Q Q t _ I 0000000000000000000 a I n S 9 3 m 'aisA.e� _o M w rri C TT om' 1 0 z 0 Q D0 < O A SEEN Q z s� �0 Q unuu TO � ro r U1 W R) , N oUloo p 0000 000o Q 3 'aisA.e� _o M w rri C TT om' 1 0 Appendix C - Cost Estimate Summary Oly of Oak Palk Heights Project NO 55- 06143-0 WaterSupp/ Plan *BwMt= 18 Ultimate System Cost Estimate Oak Park Heights Water Supply & Distribution Plan File 55 -06143 19- Dec -07 Distribution 8inch 476 LF $60 $28,560 12 inch 20,879 LF $75 $1,565,925 12 inch installed by MnDOT 5,169 LF $20 $100,796 PRVs 2 EA $70,000 $140,000 Sub Total $1,835,281 Assume Lateral Benefit 0 Total 1,835,281 Supply Redevelop Wells 1 & 2 2 EA $250,000 $500,000 1,000 gpm Wells 1 EA $900,000 $900,000 Land Acquisition (0.25 ac) 1 EA $50,000 $50,000 Total $1,450,000 Summary Distribution $1,835,281 Supply $1,450,000 Total $3,285,281 Includes 30% for Engineering, Administrative, Legal and Contingencies Appendix D - Water Quality Requirements oty o /Oak Palk Heighu Projecr No 55- 06143 -0 WaterSupp/y andD15fdbution Plan , Bonestm 19 vo EPA National Primary Drinking Water Standards Contaminant Acrylamide • • Alachlor Alpha particles MCL or TT1 m L 2 778 0.002 15 picocuries per Liter (pcilL) Potential health effects from exposure above the MC Nervous system or blood problems; Eye, liver, kidney or spleen problems; anemia; increased risk of cancer Increased risk of cancer Common sources of contaminant in drinking water Added to water during sewagelwastewater increased risk of cancer treatment Runoff from herbicide used on row crops Erosion of natural deposits of certain minerals that are radioactive and may emit a form of radiation known as alpha radiation Public Health Goal zero zero zero Antimony 0.006 Increase in blood cholesterol; decrease in Discharge from petroleum 0.006 • blood sugar refineries; fire retardants; ceramics; electronics; solder Arsenic 0.010 as of Skin damage or problems with circulatory Erosion of natural deposits; runoff 0 • 1/23106 systems, and may have increased risk of from orchards, runoff from glass & g etting cancer electronics production wastes Asbestos (fibers >10 7 million Increased risk of developing benign intestinal Decay of asbestos cement in 7 MFL • micrometers) fibers per polyps water mains; erosion of natural Liter MFL deposits Atrazine 0.003 Cardiovascular system or reproductive Runoff from herbicide used on 0.003 • p roblems row crops Barium 2 Increase in blood pressure Discharge of drilling wastes; 2 • discharge from metal refineries; erosion of natural deposits Benzene 0.005 Anemia; decrease in blood platelets; Discharge from factories; zero • increased risk of cancer leaching from gas storage tanks and landfills Benzo(a)pyrene (PAHs) 0.0002 Reproductive difficulties; increased risk of Leaching from linings of water zero • cancer storage tanks and distribution lines Beryllium 0.004 Intestinal lesions Discharge from metal refineries 0.004 and coal - burning factories; • discharge from electrical, aerospace, and defense industries Beta particles and photon 4 millirems Increased risk of cancer Decay of natural and man -made zero emitters per year deposits of certain minerals that are radioactive and may emit forms of radiation known as p hotons and beta radiation , , Bromale 0.010 Increased risk of cancer Byproduct of drinking water zero • disinfection Cadmium 0.005 Kdney damage Corrosion of galvanized pipes; 0.005 erosion of natural deposits; • discharge from metal refineries; runoff from waste batteries and aints Carbofuran O.D4 Problems with blood, nervous system, or Leaching of soil fumigant used on 0.04 • reproductive system rice and alfalfa Carbon tetrachloride 0.005 Liver problems; increased risk of cancer Discharge from chemical plants zero • and other industrial activities D Chloramines (as C12) MRDL =4.01 I Eye /nose irritation; stomach discomfort, Water additive used to control I MRDLG =41 anemia microbes LEGEND Dinsmfectant Inorganic Chemical m Organic Chemical r®'.' Disinfection Byproduct © Microorganism Redlonuddes Contaminant • Chlordane D Chlorine (as Cl2) MCL orTT1 2 0.002 MRDL =4.01 Potential health effects from exposure above the MCL Liver or nervous system problems; increased risk of cancer Eye/nose imtation; stomach discomfort Common sources of contaminant In drinking water Residue of banned termilicide Water additive used to control microbes Public Health Goal zero MRDLG =41 D Chlorine dioxide (as C102) MRDL =0.81 Anemia; infants & young children: nervous Water additive used to control MRDLG =0.81 system effects microbes Chlorite 1.0 Anemia; infants & young children: nervous Byproduct of drinking water 0.8 a : , system effects disinfection Chlorobenzene 0.1 Liver or kidney problems Discharge from chemical and 0.1 • ag ricultural chemical factories Chromium (total) 0.1 Allergic dermatitis Discharge from steel and pulp 0.1 • mills; erosion of natural deposits Copper TT7 Short tens exposure: Gastrointestinal Corrosion of household plumbing 1.3 Action distress. Long term exposure: Liver or kidney systems; erosion of natural Level = damage. People with Wilson's Disease deposits • 1,3 should consult their personal doctor if the amount of copper in their water exceeds the action level Cryptospondium TT3 Gastrointestinal illness (e.g., diarrhea, Human and animal fecal waste zero vomiting, cramps Cyanide (as free cyanide) 0.2 Nerve damage or thyroid problems Discharge from steeltmetal 0.2 • factories; discharge from plastic and fertilizer factories 2,4 -D 0.07 Kidney, liver, or adrenal gland problems Runoff from herbicide used on 0.07 • row crops Dalapon 0.2 Minor kidney changes Runoff from herbicide used on 0.2 • rights of wa 1,2- Dtbromo- 3- chkxopropa 0.0002 Reproductive difficulties; increased risk of Runofffleaching from soil zero • ne (DBCP) cancer fumigant used on soybeans, cotton, pineapples, and orchards o-Dichlorobenzene 0.6 Liver, kidney, or circulatory system problems Discharge from industrial 0.6 • chemical factories p- Dichlorobenzene 0.075 Anemia; liver, kidney or spleen damage; Discharge from industrial 0.075 • changes in blood chemical factories 1,2- Dichloroelhane 0.005 Increased risk of cancer Discharge from industrial zero • chemical factories 1,1- Dichlorcethylene 0.007 Liver problems Discharge from industrial 0.007 • chemical factories cis -1,2- Dichlorcethylene 0.07 Liver problems Discharge from industrial 0.07 • chemical factories trans -1,2- Dichlorcethylene 0.1 Liver problems Discharge from industrial 01 • chemical factories Dichloromethane 0.005 Liver problems; increased risk of cancer Discharge from drug and zero • chemical factories 1,2- Dichloropropene 0.005 Increased dsk of cancer Discharge from industrial zero • chemical factories Di(2 -ethylhexyl) adipale 0.4 Weight loss, live problems, or possible Discharge from chemical 0.4 • reproductive difficulties factories Di(2 -ethylhexyl) phthalate 0.006 Reproductive difficulties; liver problems; Discharge from rubber and zero • Increased risk of cancer chemical factories Dinoseb 0.007 Reproductive difficulties Runoff from herbicide used on 0.007 • so beans and ve etables Dioxin (2,3,7,8 -TCDD) 0.00000003 Reproductive difficulties; increased risk of Emissions from waste zero • cancer incineration and other combustion; discharge from chemical factories • Di ual 0.02 1 Cataracts Runoff from herbicide use 0.02 O U41011111111 Endothall 0.1 1 Stomach and intestinal problems Runoff from herbicide use 0.1 LEGEND D I Dinsinfectant Inorganic chemical m Orgarnc Chemical Disinfection Byproduct © Microorganism Radionuclides Contaminant MCL or TTt Potential health effects from Common sources of Public ( mg I L)2 exposure above the MCL contaminant in drinking water Health Goal • Endrin 0.002 Liver problems Residue of banned insecticide 0.002 Epichlorohydrin TTfi Increased cancer risk, and over a long period Discharge from industrial zero • of time, stomach problems chemical factories; an impurity of some water treatment chemicals Ethylbenzene 0.7 Liver or kidneys problems Discharge from petroleum 0.7 • refineries Ethylene dibromide 0.00005 Problems with liver, stomach, reproductive Discharge from petroleum zero • system, or kidneys; increased risk of cancer refineries Fluoride 4.0 Bone disease (pain and tenderness of the Water additive which promotes 4.0 bones); Children may get mottled teeth strong teeth; erosion of natural • deposits; discharge from fertilizer and aluminum factories Giardia lamb /ia TT3 Gastrointestinal illness (e.g., diarrhea, Human and animal fecal waste zero vomiting, cramps • Glyphosate 0.7 1 Kidney problems; reproductive difficulties Runoff from herbicide use 0.7 , Haloacefic acids (HAAS) 0.060 Increased risk of cancer Byproduct of drinking water Nab r : disinfection • Heptachlor 0.0004 Liver damage; increased risk of cancer Residue of banned tenniticide zero • Heptachlor epoxide 0.0002 Liver damage; increased risk of cancer Breakdown of heptachlor zero Heterotrophic plate count TT3 HPC has no health effects; it is an analytic HPC measures a range of n/a (HPC) method used to measure the variety of bacteria that are naturally present bacteria that are common in water. The lower in the environment the concentration of bacteria in drinking water, the better maintained the water system is. Hexachlorobenzene 0.001 Liver or kidney problems; reproductive Discharge from metal refineries zero • difficulties; increased risk of cancer and agricultural chemical factories Hexachlorocyclopentadien 0.05 Kidney or stomach problems Discharge from chemical 0.05 • e factories Lead TT7; Infants and children: Delays in physical or Corrosion of household plumbing zero Action mental development; children could show systems; erosion of natural ' Level = slight deficits in attention span and learning deposits 0.015 abilities; Adults: Kidney problems; high blood pressure Legionefla TT3 Legionnaire's Disease, a type of pneumonia Found naturally in water; zero multi lies in heati systems Lindane 0.0002 Liver or kidney problems Runoff /leaching from insecticide 0.0002 used on cattle, lumber, gardens Mercury (inorganic) 0.002 Kidney damage Erosion of natural deposits; 0.002 discharge from refineries and • factories; runoff from landfills and croplands Methoxychlor 0.04 Reproductive difficulties Runoff /leaching from insecticide 0.04 • used on fruits, vegetables, alfalfa, Infants below the age of six months who drink livestock Runoff from fertilizer use; 10 Nitrate (measured as 10 Nitrogen) water containing nitrate in excess of the MCL leaching from septic tanks, • could become seriously ill and, if untreated, sewage; erosion of natural may die. Symptoms include shortness of deposits breath and blue-baby syndrome. NiRe (measured as 1 Infants below the age of six months who drink Runoff from fertilizer use; i Nitrogen) water containing nitrite in excess of the MCL leaching from septic tanks, • could become seriously ill and, if untreated, sewage; erosion of natural may die. Symptoms include shortness of deposits breath and blue-baby syndrome. LEGEND Dinsinfecfant Inorganic Chemical m Organic Chemical Disinfection Byproduct © Micrcorgansm Radionuclides Cl Contaminant MCL or TT1 Potential health effects from Common sources of Public (mall-12 exposure above the MCL contaminant in drinking water Health Goal Oxamyl (Vydate) 0.2 Slight nervous system effects RunoffAeaching from insecticide 0.2 p roblems used on apples, potatoes, and 1,1,2- Thchloroethane 0.005 Liver, kidney, or immune system problems tomatoes 0.003 Pentachlorophenol 0.001 Liver or kidney problems; increased cancer Discharge from wood preserving zero Trichloroethylene 0.005 risk factories zero Picloram 0.5 Liver problems Herbicide runoff 0.5 Polychlorinated biphenyls 0.0005 Skin changes; thymus gland problems; Runoff from landfills; discharge of zero (PCBs) immune deficiencies; reproductive or waste chemicals nervous system difficulties; increased risk of cancer Radium 226 and Radium 5 pCVL Increased risk of cancer Erosion of natural deposits zero 228 combined with higher levels of disease - causing Selenium 0.05 Hairor fingernail loss; numbness in fingers or Discharge from petroleum 0.05 toes; circulatory problems refineries; erosion of natural cause symptoms such as nausea, cramps, deposits; discharge from mines Simazine 0.004 Problems with blood Herbicide runoff 0.004 Styrene 0.1 Liver, kidney, or circulatory system problems Discharge from rubber and plastic 0.1 as of factories; leaching from landfills Tetrachlorcethylene 0.005 Liver problems; increased risk of cancer Discharge from factories and dry zero cleaners Thallium 0.002 Hair loss; changes in blood; kidney, intestine, Leaching from ore - processing 0.0005 or liver problems sites; discharge from electronics, lass, and drua factories Toluene 1 Nervous system, kidney, or liver problems Discharge from petroleum 1 factories Total Coliforms (including 5,o%4 Not a health threat in itself; it is used to Coliforms are naturally present in zero fecal coliform and E. colt) indicate whether other potentially harmful the environment as well as feces; bacteria may be present5 fecal coliforms and E. coli only come from human and animal fecal waste. Tolai Trihalomethanes 0.10 Liver, kidney or central nervous system Byproduct of drinking water n /a6 (TTHMs) U80 problems; increased risk of cancer disinfection after 12/31/03 Toxaphene 0.003 Kidney, liver, or thyroid problems; increased RunoffAeaching from insecticide zero 1,2,4- Tdchlorobenzene 0.07 Changes in adrenal glands Discharge from textile finishing 0.07 factories 111,1- Trichloroethane 0.2 Liver, nervous system, or circulatory Discharge from metal degreasing 0.20 p roblems sites and other factories 1,1,2- Thchloroethane 0.005 Liver, kidney, or immune system problems Discharge from industrial 0.003 chemical factories Trichloroethylene 0.005 Liver problems; increased risk of cancer Discharge from metal degreasing zero sites and other factories Turbidity TT3 Turbidity is a measure of the cloudiness of Soll runoff n/a water. It is used to indicate water quality and filtration effectiveness (e.g., whether disease - causing organisms are present). Higher turbidity levels are often associated with higher levels of disease - causing micro - organisms such as viruses, parasites and some bacteria. These organisms can cause symptoms such as nausea, cramps, diarrhea, and associated headaches. Uranium 30 ug/L Increased risk of cancer, kidney toxicity Erosion of natural deposits zero as of 1208/03 LEGEND Dinsinfeclant Disinfection Byproduct Inorganic chaniral m Organic Chemical © Miawrganism Radionudides 4 Contaminant MCL or TT1 Potential health effects from Common sources of Public m !L 2 exposure above the MCL contaminant In drinking water Healtlt Goal Vinyl chloride 0.002 Increased risk of cancer Leaching from PVC pipes; zero discharge from plastic factories Viruses (enteric) TT3 Gastrointestinal illness (e.g., diarrhea, Human and animal fecal waste zero vomi6n , cramps Xylenes (total) 10 Nervous system damage Discharge from petroleum 10 e factories; discharge from chemical factories NOTES t OefinNOns Maximum confinement Level Goal(MCLG) —TM duelM a mnbminantin dnntirg water babe irh there ism known or eryected mi taller r. MCLGsalbx for a margin of safety and are r,onenlwceable plinks health goals. Maximum Cmbmemnt Leval (MCLHThe highest ev4 of a conteminant trust is allowed in drinki water. MCLS are set as close m Mi as feasible AN the best available treatment lechnole, and asking Mast into mnsgeretion. MC" am informants Mandards. Maxmum Residual Disinfectant Level Goal (MRDLGrThe mounts drinhig wanrdrsinf robnlbelowmatch there are Ian wncrexpechad mkto heash. MRDLGs do mal rei the bereft of pw use of dlNnfeclanb to uxnml miuohial mnlarnmants. Medium Residual Disinfectant level (MROL)f—The highest level are disinfectant allowed in drinking wither. There is wmincirg evidence Nat sodium of a i islMecbnt is necessary forcorso of mipobal conbmlrenb. Treatment Technique (70—A sense red process intended In reduce the level of a contaminant in drinking water. 2 Uses are in milligrams per IB &(mgi unions otherwise noted. Milligrams set liter are equirelent to pails per milNon(ppm). 3 EPA S surface water tresMert rules require systems using surface water or ground water under Ne direct influence of surface water an (1) disinfect their water, and (2) for their waterer irate[ orders for avoiding rillralion so Nat the following con om mene are Wntroled at the follaia g bvels'. Cryprospodd'um (as al 111412 brsystemsm irg x10,000 and 1114105br systems servkg<10,000)99 % removal . Gotham emWla 90.9%remuvali nagwatbn vinous'. 9999% mmpvaPmactwalron Legamos : No limit, but EPA Weves lost RGieNls and viruses am mmoved(meci ated, tarantella will also he conashad. Tonsi :At an time can an idety(cbudiress of water)go abate$nsphebbmeNC turbidity unie(NTU); systems Nat rifler most ensure that the turbidly go no h igher then 1 NTU (0,5 NTU for mnvermorml or direct fillralon)In M lees) 95% of des daily samples In any month. As of January 1, 2002, for systems sershang 110.00), and January 14, 2005. for systems Sam[ rig 00,000. formally may never exceed 1 Ni antl most not exceed 0.3 NTU in %% of dally szmptes in any month. HPC: No mite than 500 haclerial monies par mJlllllm • Long Term 1 Enhanced Surem Wata Trearmanl (Effective Date. January 14,2005); Suhce weer spteres or (GWUDq systems serving few a Nan 10,1100 people mint comply with the act iraWe Lag Term 1 Enhanced Surface Weser Treatment Rule pMVfskms (e g. almost slandards, individual for monsodrg, CrypfospandieW removal requmremenb, updated watershed conh'ol equiemene for unstated eyekms). • Filler Backwash Recycfirg:The Filler Backman Recycling Run requires syslemsliat recycle to ebm spec recycle flows through all processses of the system's exMbg mnvenlbnal ditlimct fiNagon system oral an alternate bmdon aPpMVed byfhe stele. 4 No more then 5.0% samples total wlaomrposOre in a Month( Forwatersystemsthat mlectfnwerown 40 Moore samples per month, m more gran ore sample can be ldal mlaam- pmrliva per month.( Every sampnlhal has bbl wraorra mustnd areryzadfareiderferal mfiforr orE softiftwo wnsecu4ve TC- positivesamples, ant one nalw positive for E. coli feca wmibrms, system hasten note MCL violation 5 Feral co nnn ant E. sm art baser whose presence moves that the weer may be m Lomnaletl with human or animal wastes. Dise nnoWusing miuobes (padropern) in thew wastes con muse d aii cramps reason, Notation, or other symplpms. These "Mcgers nay pose a s uscal headh mill far infant, young strider. and exi with saverely compromised immum spterra. 6 Mheugh Here is no wlle4tive MCLG for he contaminant githers am individual MCLGS for some of the Individual comeso iranls: Habacelb ands: dichlpreacelic acid (Ism): acharoacetmc add (0.3 mghL) TntmabnaNeners: bmmodichlorometha a (zees; bmmolorm (zoo); dibromochlaomethane (006 myy T Lead end agperere regulekd bye Treebnanl Technpue Nat mqunes aplamsbmMOl Oa corro9vemes of Heir waler.Hmora than l0%al Np water semDles exceed the actor level, wekrsptems must bkeanddimelskps. Forwppe., Nettrxm level u 1.3 mgff, aria for leatl u 0015 myi. B Eachamersyatem MA W", inwntirg,btwsala(Using third arywmarrhacWmscerMmWn)Natwhen ilusesacrybmdeanNorepdhbmhyddnbtreatwabr, the camdnalen (w pMduC)afdosaeM mummer bvN dcea not arce ddekwlssDeuaed, mldbwa. Acrlamide= 0. 05% dostlat1mgh (orequheknt):EDbhbmhydnn= 0.01 %dosndx120mgVL(aequWv t). LEGEND Dinsinfectent F—V Inorganic chemical m Organic chemical Disinfection Byproduct 7-1 Microorganism Rad,onuclides National Secondary Drinking Water Standards National Secondary Drinking Water Standards are non-enforceable guidelines regulating contaminants that may cause cosmetic effects (such as skin or tooth discoloration) or aesthetic effects (such as taste, odor, or color) in drinking water. EPA recommends secondary standards to water systems but does not require systems to comply. However, states may choose to adopt them as enforceable standards. contarwmmt Secondary Standard Aluminum 0.05 to 0.2 mg/L Chloride 250 mg/L Color 15 (color units) Copper 1.0 mgt Corrosivity noncorrosive Fluoride 2.0 mg/L Foaming Agents 0.5 mg/L Iron 0.3 mg1L Manganese 0.05 mg/L Odor 3 threshold odor number pH 6.5 -6.5 Silver 0.10 mg/L Sulfate 250 mg/L Total Dissolved Solids 500 mg/L Zinc 5 mg/L Office of Water (4606M) EPA 816 -F -03 -016 www.epa.gov /safewater June 2003 7 Appendix E - Supplemental Maps olyof Oak ParkHeigh15 Project No: 55- 06143 -0 WaterSUPP /y and Distnbution Plan Bw*SUW 20 I• 0 L i 7 a? CC �Li � I_ a I 1_ J ✓ [ = IR � r �L� I � i -1 5 y gq� � r I l L `r L . -,� a^ J / El F 1, ML, � ® ca 1= 1ttrr ] g$ 1_11J ® J F= 1 I 2 1✓ � �-' -rig �'� � / lT� 7:� I , % ' �