1) Executive Summary Exhibit S-A 2) Existing System
a. Base Map Exhibit ES-A b. Sewer Drainage Basins Exhibit ES-B
3) Population Growth a. Growth (Annexation) Figure PG-1 b. Dwelling Unit Construction Figure PG-2 c. Census Data Figure PG-3 d. 5-Year Growth Area Exhibit PG-A e. 10-Year Growth Area Exhibit PG-B
4) Collection System Model a. Hydra Land Use Areas Exhibit SM-A b. Diurnal Flow Charts Figure SM-1 c. Sampling / Collaboration Exhibit SM-B d. Land Use Area Figure SM-2 e. 5-Year Model Exhibit SM-C f. 10 Year Model Exhibit SM-D g. Build-out Model Exhibit SM-E
5) Capitalization Plan a. Funding Charts Exhibit CP-A b. Capital Plan Exhibit CP-B c. High Priority Project Exhibits CP-C & CP-D d. Med Priority Project Exhibits CP-G & CP-F e. Low Priority Project Exhibits CP-G & CP-H
6) Lift Station Summary 7) Appendices
a. Land Use Area Data b. Flow Sample Data
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SECTION 1 EXECUTIVE SUMMARY
WATER RECLAMATION COLLECTION SYSTEM MASTER PLAN Executive Summary The Water Reclamation Collection System Master Plan update provides a technical review of the City of Post Falls’ collection system, based upon the most recent growth and financial projections for the community. The Plan provides recommended timing of improvements based upon anticipated growth, as well as replacement of aging infrastructure. The boundaries for this Master Plan are limited to those shown on Exhibit S-A (Plan Area), and do not include those areas analyzed in the Rathdrum Prairie Wastewater Master Plan. The collected wastewater areas within the Rathdrum Prairie Plan, excepting the northeast Section, do not flow through the existing collection system - rather they will be pumped to bypass the existing system. The Master Plan is the result of the collaborative efforts of the City’s Water Reclamation and Engineering Divisions. The work involved field reviews of each of the City’s 28 lift stations; modeling the collection system based upon existing and future flows, calibration of the model, development of needed improvements, and balancing of needed improvements based on projected capital dollars, and anticipated operation and maintenance funds received. The Collection System Master Plan is based upon a projected population growth rate of 2.5% throughout the City as a whole, with more specific growth projections within certain areas of the community that are primed for growth. As with growth, the resultant flows and associated improvements are our best projections. It is important that this data be reviewed annually, to insure projections are on track. The Master Plan should also be updated every five (5) years. Noted are some of the priority infrastructure needs balanced with available budgets within the Collection System:
o Upgrade the McGuire Lift Station, as it is approaching the end of its useful life. o Upgrade the 3rd Avenue Lift Station, to replace aging equipment, provide increased
emergency storage, and remove constrictions to the capacity of the Greensferry Lift Station.
o Construct a 20-inch force main from the Idahline Lift Station to the Waste Water Reclamation Facility, to accommodate anticipated growth in the west part of the City.
While this report emphasizes a 5-year term, improvement projects through the year 2034 term are provided within the report. Financing and balancing of improvements is based upon current reserves at today’s growth rates, fees, and charges. The recommended Capital Improvement Plan (CIP) is constrained within current Capitalization and Utility Fee rates; requiring no increases. Dollars are represented at present worth, and it is assumed that adjustments to the fees by the Engineering News Record Construction Cost Index will keep fees
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in alignment with rising construction dollars. The Capital Improvement Plan will also receive updated cost estimates every 5 years, with the Master Plan updates. Current fund balances are $1.6 million in the Collection Capitalization Account (Account No. 652), and $5.5 million in the Replacement Fund Account (Account No. 650). Goals are to have a minimum balance of $400,000 for capital improvements within Account No. 652, and to accrue $7.8 million in Account No. 650 by 2030. Elements of the Master Plan will continue to be refined over the next few years. Our primary areas for refinement will be the continued modification towards electronic updates of the Plan using GIS mapping connected with actual improvements, budget, flow, and maintenance. The goal will be a “living” document used by both the Engineering and Public Works Divisions, as they manage the growth and provide for the maintenance of the Water Reclamation Collection System for the City of Post Falls.
SECTION 2 EXISTING SYSTEM The Existing Water Reclamation Collection System for the City of Post Falls serves a population of 27,574 people comprising 9,522 residential utility accounts, and 698 commercial accounts. To provide water reclamation service to this population, the physical collection system that transmits sewerage from homes and businesses to the Water Reclamation Facility contains 28 lift stations, 137 miles of gravity sanitary sewer main, and 24 miles of sanitary sewer force main. The original water reclamation system for sanitary sewer was installed in the 1980’s utilizing a loan from the State of Idaho, and funded by the Environmental Protection Agency. Phase I of the project installed 3 lift stations and provided gravity sanitary sewer in the older parts of Post Falls bounded by Idaho Street and Chase Road (east-west), and from 15th Avenue on the north to the Spokane River. Phases II through IV of the original system expanded south of Interstate- 90 in an easterly direction to Ross Point Road; northerly, between Chase Road and Idaho Street, to Poleline Avenue; and westerly, along Seltice Way to Corbin Road. During construction of Phases II thru IV, an additional 6 lift stations were brought online increasing the City’s lift stations from the original 3 to 9 total.
In the 1990’s and the first decade of the 21st Century, residential and commercial growth and expansion in the City of Post Falls added significantly to the area served by the water reclamation system, which added another 19 lift stations to the City’s facilities, to total 28.
The City’s 28 lift stations are divided into three general categories: Temporary Lift Stations, Regional Lift Stations and Local Lift Stations. The estimated replacement value for all of the City’s lift stations is $18 million, excluding force mains. Temporary Lift Stations
Pioneer Ridge Grayling Howell Prairie Falls II
Regional Lift Stations 3rd Avenue 4th Avenue 12th Avenue Idahline Greensferry Montrose Ponderosa Fisher
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Local Lift Stations Beck Jacklin Corbin Guy
Prairie Falls I Seltice McGuire Mazda Bentley Wide River Ranch Shore Pines Tullamore Highlands Ohio Match Riverside Harbor Kiwanis Park** Falls Park** **Private Lift Station owned by Post Falls Park Department with maintenance performed by the
Post Falls Public Services Department – Water Reclamation Division.
Temporary lift stations are located to facilitate the development of areas where the cost of building the full improvements, and to provide service to an area in conformance with the Water Reclamation Master Plan, would be cost prohibitive. The City currently has 3 lift stations that are classified as Temporary Lift Stations. This Master Plan will increase that total to 4 temporary lift stations. Regional lift stations receive flows from a larger geographic area or from several lift stations, and move the sewerage to the Water Reclamation Facility. In general, regional lift stations can be categorized by the presence of three pumps and the capability of pumping in excess of 500 gallons of sewerage per minute. The City currently has 8 Regional Lift Stations. Lift stations that are not referred to as Regional Lift Stations or Temporary Lift Stations are those facilities installed at locations determined by the Water Reclamation Master Plan; which are intended to serve a small geographical area with no or limited flows from other lift stations (other than temporary lift stations), and generally pump at a rate of 500 gallons of sewerage per minute or less. The City of Post Falls has 16 lift stations that are not classified as a Regional or Temporary facility. The City’s Water Reclamation Collection System for gravity sewer collection consists of a pipe network ranging from 6-inches in diameter to 24-inches in diameter. Of the City’s 137 miles of gravity sewer, 100 miles (73% of the total) is 8-inches in diameter. The estimated value of the City’s Gravity Sewer Collection System, including manholes, is $31 million. Replacement cost for these facilities is estimated at $133 million including excavation, manholes, and roadway restoration. Force mains are utilized to transmit sewerage from one lift station to another, or to the Water Reclamation Facility. To facilitate the City’s lift stations, there is in excess of 24 miles of force main installed; ranging in size from 4-inches in diameter, to 20-inches in diameter. The estimated value of the City’s force mains is $3.5 million. Replacement cost for these facilities is estimated at $12 million including excavation, valves, and roadway restoration.
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W JULIA DR
W 4TH AVE
W ECHO DR
E 13TH AVE
E 15TH AVE
E 11TH AVE
E 21ST AVE
W 12TH AVE
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2012 WATER RECLAMATION COLLECTION SYSTEM
MASTER PLAN BOUNDRY
SECTION 3 POPULATION AND GROWTH
Population and growth projections are an essential part in the preparation of master plans. Growth projections allow for the development of system modeling and revenue forecasts. Growth projections based upon historic tendencies and reflecting varying rates of growth allow better guidance in the sizing and timing of the construction of new facilities, and revenues, by examining the sensitivity of predicted growth patterns of greater or lesser magnitude than actual growth. In the year 2000 the City of Post Falls comprised an area of land consisting of approximately 5,623 acres, and contained a population of 17,247 persons (1)(2). In the decade between the 2000 and 2010 United States Census the City experienced continued growth; with stronger annexation growth during the first half of the decade, and fairly uniform population growth over the entire decade. Between 2000 and 2005 the City was annexing an average of 400 acres per year, equating to an annual average annexation growth of 6.34% per year. The second half of the decade, 2005 through 2010 saw a 63% reduction in annexations down to 148 acres per year, or an average annual annexation growth rate of 1.9% per year. Population growth during the 2000 to 2005 time frame tracked at a slightly lower growth rate, than that seen with annexations of 4,816 persons being added to the population, at an average annual growth rate of 5.1% per year. From 2005 to 2010 population growth dropped slightly with an additional 5,511 persons being added to the population, at an annual average growth rate of 4.6% per year. By the completion of the 2010 Census, the City of Post Falls had grown to a land area of 8,365 acres (48.7% total annexation growth 2000-2010), and a population of 27,574 people (59.9% total population growth 2000-2010 at an average rate of 4.7% per year) (1)(2).
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In November of 2012 staff from the City of Post Falls’ Public Services Department (Engineering Division, Planning Division and Water Reclamation Division) met to determine growth rates for use in the 2010 Water Reclamation Collection System Master Plan. In determining future growth rates, the group utilized collected data on historic growth, building permit history, realized flow rates at the Water Reclamation Facility, economic forecasts, and other planning documents recently prepared for the City (3)(4)(5)(6)(7). Analysis of planning documents and reports prepared for the City showed a varying range of future growth projections from 1.5% per year in the “then developing” Impact Fee Report (3), to 3.5% in the J.P. Stravens Report (4). These numbers were lower than historic growth rates; however, the rates did correspond with flow rate data from the Water Reclamation Facility and Building Permit data. Coupling this information with the local economic conditions; it was agreed upon to examine population growth rates within the sewer model at a low rate of 1.5% per year, a medium rate of 2.5%, and a high rate of 3.5% for a 5-year (2017) and a 10-year (2022) analysis period. For both the 5-year and 10-year analysis periods, an annexation growth rate of less than 2% and a population growth rate of 2.5% were determined to be the basis for modeling. Figure PG1
Source: City of Post Falls, Public Services – Community Development, Planning Division
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Source: City of Post Falls, Public Services – Community Development, Building Division
Figure PG3
Source: City of Post Falls, Public Services – Community Development, Planning Division
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5-year (2017) Growth Projections (see Exhibit PG-A) For the 5-year growth projection, annexation rates of less than 2% are expected to continue from the trends seen between the years 2005 and 2010. Where annexations do occur, they are anticipated to be in smaller parcels currently existing as County islands surrounded by the City of Post Falls, or accumulated parcels immediately adjacent to the existing City boundaries. Population and commercial growth projections for the 5-Year Model were based upon an analysis of where current permits were being issued, what lands were platted and available for development, and what land was un-platted but had pending development plans. The City was then divided into three (3) zones and twenty-six (26) growth areas, to allow distribution of the City’s growth into the Waste Water Model in a manner that would best correspond with the anticipated growth patterns. West Zone The West Zone is located north of the Spokane River, west of McGuire Road, east of the Idaho State line, and south of the lands within the Rathdrum Prairie Waste Water Master Plan (7). The West Zone is comprised of mainly industrial and commercially zoned lands, with some single-family and multi-family developments. With the construction of a new freeway interchange from Interstate-90 near Beck Road, and lands with available or planned commercial and industrial development potential, this zone is anticipated to see a majority, 58%-65% of the total commercial growth for the City of Post Falls through 2017. Less residential growth, 12%- 14% of the total residential growth for the City of Post Falls through 2017 is anticipated in this zone. The lower residential growth is anticipated due to the lack of approved residential developments, and few large-acre parcels of land available with immediate potential for residential development. Commercial Growth for this zone is anticipated to generate between 22,000 to 48,000 additional gallons of wastewater to the Water Reclamation Facility by the end of 2017. For Model projections, 30,000 gallons per day of new sewerage was distributed within the western zone and growth areas 1 through 5. Residential growth in the West Zone is anticipated to see 270 to 750 new persons, generating between 21,600 and 60,000 gallons of additional sewerage (at 80 gallons of wastewater per person per day), to the Water Reclamation Facility by the end of 2017. For Model projections, 514 persons generating 41,120 gallons per day of new wastewater was distributed within the western zone and growth areas 1 through 5.
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Central Zone The Central Zone is located east of McGuire Road, West of Greensferry Road, north of the Spokane River and South of Prairie Avenue; with the exception of the Crown Pointe Subdivision (Growth Area 26), that is located north of Prairie Avenue. The Central Zone is comprised primarily of residentially zoned lands and two commercial corridors: 1) Seltice Way between Mullan Avenue and Interstate-90 from Idaho Street to Greensferry Road; and 2) the downtown area between Spokane Street, Idaho Street, Mullan Avenue, and 3rd Avenue. This zone is anticipated to see 20% to 25% of the total commercial growth for the City of Post Falls through 2015. 67% of the commercial growth in this zone is likely to be located in the development of three (3) existing planned commercial developments; growth areas 7, 8, and 13. Remaining commercial growth will be equally dispersed within the remainder of the identified commercial areas. Residential growth of 42% to 46% of the total residential growth for the City of Post Falls through 2017 is anticipated in this zone. A majority of the residential growth is anticipated to happen in the existing approved subdivisions located along the northern and western portions of this zone.
Commercial Growth for the Central Zone is anticipated to generate between 7,000 to 27,000 additional gallons of wastewater, to the Water Reclamation Facility by the end of 2017. For Model projections 12,500 gallons per day of new sewerage was distributed within the Central Zone and growth areas 7, 8, and 13.
Residential growth in the Central Zone is anticipated to see 1,000 to 2,200 new persons, generating between 80,000 and 176,000 gallons of additional sewerage (at 80 gallons per person per day), to the Water Reclamation Facility by the end of 2015. Model projections using 1,582 persons generating 127,000 gallons per day of new sewerage was distributed within the Central Zone, and growth areas 6 through 16, and 23 through 26.
East Zone
The East Zone is located east of Greensferry Road, West of Huetter Road, north of the Spokane River, and South of the lands within the Rathdrum Prairie Waste Water Master Plan (7), Prairie Avenue. The East Zone is comprised primarily of residentially zoned lands and 3 commercial corridors: 1) Seltice Way with commercial business west of SH41 and Industrial Development east of SH41; 2) located between Mullan Avenue and Interstate-90 west of SH41; and 3) along the SH41. This zone is anticipated to see 15% to 17%, of the total commercial growth for the City of Post Falls through 2017. 40% of the commercial growth in this zone is likely to occur in growth area 19 along SH41, and the remainder will be equally dispersed within the identified commercial areas.
Residential growth of 42% to 44% of the total residential growth for the City of Post Falls through 2017 is anticipated in this zone. A majority of the residential growth is anticipated to occur in the existing approved subdivisions located along the northern third of this zone, near SH41.
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Commercial growth for the East Zone is anticipated to generate between 5,000 to 15,000 additional gallons of sewerage to the water reclamation facility by the end of 2017. Model projections of 8,000 gallons per day of new sewerage were distributed within the East Zone and growth area 19.
Residential growth in the East Zone is anticipated to see 900 to 2,300 new persons, generating between 72,000 and 184,000 gallons of additional sewerage (at 80 gallons per person per day), to the Water Reclamation Facility by the end of 2017. Model projections of 1,623 persons generating 130,000 gallons per day of new sewerage were distributed within the Central Zone and growth areas 17 through 22. 10-year (2022) Growth Projections (See Exhibit PG-B) For the 10-year growth projection, annexation rates of less than 2% are expected to continue from the 5-Year Model. Where annexations do occur, they will tend to be in smaller parcels that currently exist as county islands surrounded by the City of Post Falls, or accumulated parcels immediately adjacent to the existing City boundaries. Population and commercial growth for the 10-Year Model were built upon the medium growth rate of 2.5%, which was also utilized in the 5-year model. The distribution of new growth between 2017 and 2022 utilized the same zones as the 5-Year Model; however, specific growth areas were not identified as they were viewed as being too speculative beyond 2017. The 10-year model took the differences between the 10-year and 5-year models, and distributed it equally within each zone from a base that was established for 2017 with the projections of the 5-year model. West Zone
The West Zone is located north of the Spokane River, west of McGuire Road, east of the Idaho State line and south of the lands within the Rathdrum Prairie Waste Water Master Plan (7). The West Zone is comprised of mainly industrial and commercially zoned lands with some single- family and multi-family developments. Due to the construction of the Beck Road Interchange identified in the 5-Year Model, a majority of commercial development will remain within this zone with 66% of the total commercial growth for the City of Post Falls through 2022. A residential growth rate of 10% of the total residential growth for the City of Post Falls through 2022 is anticipated in this zone. Commercial Growth for this zone is anticipated to generate between 49,000 to 92,000 additional gallons of sewerage to the water reclamation facility by the end of 2022, from 2010 levels. For Model projections 65,000 gallons per day of new sewerage was distributed within the western zone. Residential growth in the West Zone is anticipated to see 435 to 1,108 new persons, generating between 35,000 and 89,000 gallons of additional sewerage (at 80 gallons of per person per day) to the water reclamation facility by the end of 2022. For Model projections 757 persons generating 61,000 gallons per day of new sewerage, from the 2010 base, was distributed within the western zone.
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Central Zone
The Central Zone is located east of McGuire Road, West of Greensferry Road, north of the Spokane River and South of Prairie Avenue; with the exception of the Crown Pointe Subdivision (Growth Area 26 5-year growth plan), that is located north of Prairie Avenue. The Central Zone is comprised primarily of residentially zoned lands and three commercial corridors: Seltice Way; between Mullan Avenue and Interstate-90, from Idaho Street to Greensferry Road; and the downtown area, between Spokane Street, Idaho Street, Mullan Avenue and 3rd Avenue. This zone is anticipated to see 15% of the total commercial growth for the City of Post Falls through 2022. Commercial growth will be equally dispersed within the identified commercial areas. Residential growth consisting of 45% of the total residential growth for the City of Post Falls through 2022 is anticipated in this zone. Commercial growth for the Central Zone is anticipated to generate between 11,300 to 20,000 additional gallons of sewerage to the Water Reclamation Facility, by the end of 2020. Model projections of 15,000 gallons per day, of new sewerage were distributed within the Central Zone. Residential growth in the Central Zone is anticipated at 2,000 to 5,000 new persons generating between 160,000 and 400,000 gallons of additional sewerage (at 80 gallons per person per day), to the Water Reclamation Facility by the end of 2022. Model projections of 3,400 persons generating 272,000 gallons per day of new sewerage were distributed within the Central Zone.
East Zone
The East Zone is located east of Greensferry Road, West of Huetter Road, north of the Spokane River and South of the lands within the Rathdrum Prairie Waste Water Master Plan (7), Prairie Avenue. The East Zone is comprised primarily of residentially zoned lands and three commercial corridors: 1) Seltice Way, with commercial business west of SH41 and Industrial Development east of SH 41; 2) located between Mullan Avenue and Interstate-90 west of SH41; and 3) along SH41. This zone is anticipated to see 20% of the total commercial growth for the City of Post Falls through 2022. 45% of the total residential growth for the City of Post Falls through 2022 is anticipated in this zone.
Commercial Growth for the East Zone is anticipated to generate between 15,000 to 28,300 additional gallons of sewerage to the water reclamation facility from 2010 base flows, by the end of 2022. For Model projections, 20,000 gallons per day of new sewerage was distributed within the East Zone. Residential growth in the East Zone is anticipated to see 1,950 to 5,000 new persons, generating between 156,000 and 400,000 gallons of additional sewerage (at 80 gallons per person per day), to the Water Reclamation Facility by the end of 2022. For Model projections 3,400 persons generating 272,000 gallons per day of new sewerage was distributed within the Central Zone.
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Build-out Analysis In the Build-Out Analysis; all land use areas within the Model will be fully developed to the anticipated densities of population and commercial use, as identified within the City’s future land use map maintained by the City of Post Falls, Public Services Department – Community Development, Planning Division. No estimate is currently provided for when the City of Post Falls will reach populations or densities at/or approaching projected build out values. Currently, sufficient land for new development or re-development has projected availability well beyond the 10-year analysis period, at varying growth rates. The factors that may limit or accelerate growth between the 10-year projections and build out projections are dynamic and too speculative, to warrant further analysis at this time. REFERENCES – POPULATION / GROWTH
(1) November 2010 - City of Post Falls, Public Services Department – Planning Division (J. Manley) (2) U.S. Census Bureau - www.census.gov
(3) Capital Improvement Plans and Development Impact Fees – 2011 Tischler Bise
(4) Growth Projections – 2007 J.P. Stravens
(5) City of Post Falls Water Master Plan – 2007 JUB Engineering
(6) November 2012 - City of Post Falls, Public Services Department – Water Reclamation Division (M. Neher and R. Froleck)
(7) Rathdrum Prairie Wastewater Master Plan – 2009 JUB Engineering
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SECTION 4 COLLECTION SYSTEM MODEL
The 2012 Water Reclamation Collection System Master Plan is an update to the 2000 Wastewater Master Plan completed by Kimball Engineering. Both master plans utilize the Hydra modeling software created by Pfizer Incorporated. This software has features to analyze, design, and manage storm, sanitary and combined sewer systems. The Model created by Kimball Engineering in 2000, utilized Hydra Modeling Software Version 6.1.18, and the results were incorporated into the 2000 Wastewater Master Plan. The 2000 Model was created through joint efforts from Kimball Engineering and City staff. In 2005, the City upgraded to Hydra Modeling Software Version 6.3, and City staff updated Kimball Engineering’s Model to reflect changes in sewer main that had been installed since 2000, and any revisions to the existing and build-out Land Use Area. In 2006, JUB Engineering prepared a technical memorandum reviewing lift station capacity, and updated the Capital Improvement Plan through 2012. The information from the original model and the subsequent revisions was reviewed by City staff and incorporated into the updated 2012 Water Reclamation Collection System Master Plan, along with information obtained from the updated model using Hydra Modeling Software Version 7.1.0.80. Six (6) discussion sections follow:
a.) The Hydra Land Use Areas b.) Sampling / Calibration c.) Existing System d.) 5-Year Model e.) 10-Year Model f.) Buildout Model
HYDRA LAND USE AREAS
The Hydra Land Use Areas are homogenous regions that are oriented to where and how people live and work. There are three (3) basic types of land use for sanitary flow injections within each land use area. The types of flow represented in each land use area are residential population, commercial flows, and visitor flows. Each type of land use creates a particular flow pattern throughout a 24-hour period, called a diurnal curve. A diurnal curve is an average of the individual flow sources over a period of time. The diurnal curves produce different peak flows at different times for the individual types. For example, 7:00 a.m. and 6:00 p.m. are peak times for residential usage, whereas commercial usage tends to peak from late morning through the middle of the afternoon. Visitor flows would have a similar peak to the commercial flows. The 2012 Water Reclamation Collection System Master Plan utilizes diurnal curves that have been modified to reflect typical flow patterns identified during flow sampling and flow calibration. The Residential diurnal curve is a combination of all single-family and multi-family structures within the land use area.
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The Comm_Industl diurnal curve reflects all commercial structures that fall within the specific land use area. The Public and School diurnal curves are shown with the particular patterns during the day, for all the public and school locations. All of the land use areas contain a minimum of two (2) types of flows. The most common flows are the Residential and Comm_Industl flows. The Public and School flows are added when parks and schools are located in the specific land use area. The four (4) types of diurnal curves used in the model are shown in figure SM-1. Figure SM-1 Diurnal Flow Charts
RESIDENTIAL COMM_INDUSTL
PUBLIC SCHOOL
The combination of flows from the Land Use areas are then injected into smaller divisions called Service Basins. These basins represent the areas where a pipe segment or pipe segments are able to inject flows into the system. This may vary depending upon the desired sensitivity of the model; and available data from individual lots, to city blocks, or entire subdivisions. The amount of flow going into each Service Basin is based upon the proportional area of the Service Basin from the Land Use Area (see figure SM-2 Land Use Area 4). This data is evaluated and can be modified based upon flow sampling, to calibrate the Model or to incorporate changing demographics within the service basin (construction of a school, a new apartment complex or changes in commercial water usage). City Engineering staff have gathered the estimated residential population from the City Planning Division, and commercial water usage from the City Water Utility Division. Currently, the City’s Hydra Model contains 76 Land Use Areas covering the projected City boundary, excluding those areas modeled within the Rathdrum Prairie Waste Water Master Plan. The existing or present day model uses 58 Land Use Areas. Another 18 Land Use Areas do not have data entered in any of the fields, and represent future growth areas through build out. The total number of Land Use Areas within the model is 76.
Diurnal Curve #1
Diurnal Curve #2
Diurnal Curve #3
Diurnal Curve #4
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Calibration
The measurement of the quantity of sanitary sewerage flowing within the existing pipe network, and pumped at each of the existing lift stations is valuable in identifying system capacities and maintenance concerns. The data is utilized in verifying the general trends for existing diurnal curves, or the creation of new diurnal curves. The data is a further critical element in calibrating the model, to more accurately reflect actual current conditions, so that future flow projects have a higher degree of reliability.
The City’s Water Reclamation Division places flow meters in designated manholes, to retrieve flow data throughout the City of Post Falls. Seventeen (17) sampling points (see Exhibit SM-B Sampling Points for Calibration) were identified by the Engineering Division that represent key locations of specific sections of the City, or are potential areas of maintenance concern. These locations provide vital information used in the calibration of the Hydra Model. This data is analyzed and compared to the same location in the Hydra Model for the existing conditions. The Land Use data; including populations, commercial flow, and diurnal flow characteristics listed in the model is then adjusted to better reflect field data.
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Figure SM-2 Land Use Area 42
Calibrated base assumptions that are utilized in the 2012 Model include: Residential flows at 80 gallons/person/day, Commercial flows calculated from existing utility records within each Land Use Area and a base City population of 27,002 (2010). The land use densities along with growth rate information, was gathered from the City Planning Division, Water Reclamation Division, and Census Bureau. It should be noted that it is impractical to expect the Model to match existing conditions at all locations, at all times. Residential and Commercial use tends to vary from home to home; and from business to business on daily, weekly, and seasonal trends. The data utilized to gauge and create the base assumptions is generated form average uses across the community. By incorporating this data into the Model and adjusting the percentages of the three (3) data fields in the Land Use Areas; the results are balanced, to reflect the closest conditions to the data obtained from the field. Because flows from different areas convey into common pipes, adjusting the data may take multiple attempts.
LANDUSE AREA 42 AREA: 187.84 Acres
Existing 5-year 10-year build out
Residential population: 420 638 470 1,400 Commercial flow (gpd): 36,000 39,834 40,329 90,000 Visiting Population: 300 300 300 300
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EXISTING SYSTEM
The existing sanitary sewer system for the City of Post Falls consists of 737,316 lineal feet (139.64 miles) of various sizes of sanitary sewer pipe (ranging from 6-inch diameter to 24-inch diameter); 97,489 lineal feet (18.46 miles) of various size force mains (ranging from 2-inch diameter to 20-inch diameter); and 2,992 manholes and 28 lift station. The system covers an area of approximately 14.34 square miles. New additions to the City infrastructure have been incorporated into the Hydra Model by importing the data from AutoCAD, and verified through Record Drawings. The data was last updated March 25, 2011.
Results of the Base Model run indicate that the existing system does not have any deficiencies in capacity, for handling the current flows within the collection system - including lift stations and force mains.
5-YEAR MODEL
The 5-Year Model increases populations and commercial flow generation in conformance with the 5-year growth projection map, and anticipates no significant extensions of collection facilities that are not currently serviced by the City Water Reclamation Facilities. It incorporates a 2.5% (medium) annual growth rate, as identified in the population and growth projections section of this report. The 5-Year Growth Projection Map (See Exhibit PG-A) indicates the projected growth locations, the increases in residential population, and the increases in commercial flows. This data was incorporated into the Hydra Model for each Land Use Area shown on the map. If the projected growth areas overlapped multiple Land Use Areas, the data was divided equally between the Land Use Areas.
Results from the 5-year model run indicate the impacts of growth, in the patterns anticipated, will require the following system upgrades and replacements to continue providing sufficient system capacity:
1) Beck Lift Station: Replace with a larger capacity lift station (650 gallons / minute capacity) and the extension of a new force main to the intersection of Jacklin Road / Expo Parkway. Until such time as the Idaline Lift Station is connected by forcemain directly to the water reclamation facility, monitoring will be needed so the Idahline Lift Station and the Corbin Lift Stations do not exceed their capacity.
2) Idahline Lift Station will require the installation of a 20-inch force main from the Lift Station to the Water Reclamation Facility. This is in response to projected continued growth in the commercial and industrial areas of “The Pointe at Post Falls”, “Expo”, and “Riverbend”, and limited capacity at the Corbin Lift Station, from the new flows projected from the Beck Road Lift Station.
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sylinks5
3) Third Avenue Lift Station: The Third Avenue Lift Station services all sewer flows
within Post Falls east of Idaho Street. There are three (3) issues of concern that need to be addressed as a high priority project at the Third Avenue Lift Station. First, the Greensferry Lift Station pumps to the Third Avenue Lift Station and is capable of pumping sewerage at a rate greater than the current pumping capacity of the Third Avenue Lift Station. The Greensferry Lift Station is currently throttled back to limit the potential of overflowing the 3rd Avenue Lift Station. Second, at current peak flow rates there is 15 minutes of emergency storage available in the Third Avenue wet well, before sewerage would overflow onto property north of the Lift Station. In the event that the pumps were to fail, 15 minutes is insufficient for staff to respond. The City’s Lift Station Design Standards have an adopted minimum standard at 30 minutes of emergency storage. Third, the installation of larger pumps would require additional elevation between the pump intake elevation and the free liquid surface in the wet well. At present there is approximately 1.2 feet of water depth available over the suction lines for the pumps, and ideally there should be at least 3 feet of depth. Insufficient levels of water depth (free surface water) can introduce additional air into the liquid which produces cavitation; resulting in reduced capacity, excessive ware of impellers, wasted power, and noisy operations.
4) Jacklin Lift Station: Replace the existing lift station with a larger capacity lift station (810 gallons / minute capacity).
10-YEAR MODEL The 10-Year Model is a modified version of the 5-Year Model, and does not anticipate the addition of any new lift stations, or the significant extension of sanitary sewer mains. This model also utilizes a 2.5% (medium) annual growth rate; as identified in the population and growth projections section of this report, and shown on the 10-Year Growth Projection Map. Anticipated growth of residential populations and commercial flows were divided equally in each of the Land Use Areas for each zone, and incorporated into the appropriated Land Use fields. Results from the 10-year Model run indicate the impacts of growth, in the patterns anticipated, will require the following system upgrades and replacements to continue providing sufficient system capacity:
1) Montrose Lift Station: Increase the existing lift station’s pumping capacity with new pumps (900 gallons / minute capacity), and extend the force main to the Water Reclamation Facility.
2) Howell Lift Station: This Lift Station was originally installed as a temporary facility to allow for the development of The Meadows and Prairie Meadows Subdivisions. Insufficient capacity exists at the Lift Station to support continued growth within the Lift Station’s service area. Decommissioning of the Lift Station will require the installation of gravity sewer main from the Lift Station to the Montrose Lift Station.
3) Fisher Lift Station: Increase pumping capacity (600 gallons / minute capacity), and provide additional emergency storage capacity.
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4) Ponderosa Lift Station: This Lift Station was originally installed with Phase II
improvements of the City’s original Water Reclamation Facilities. Improvements are needed to address aging equipment, and to provide for additional emergency storage to meet current standards.
5) Pioneer Ridge Lift Station: Decommission the Lift Station and re-route the flows into the Montrose Lift Station’s service area. This project will reduce the maintenance and operations costs, as well as reducing the potential of backups in pipes with limited capacity near the current Pioneer Ridge Lift Station’s force main discharge point. Additional benefits of this project include reduced operations costs at the 4th Avenue Lift Station.
6) Grayling Lift Station: This Lift Station was originally installed as a temporary facility, to allow for the development of the Grayling Estates Subdivision. Decommissioning of the Lift Station will reduce the number of times that sewerage from the Grayling Estates Subdivision is pumped, prior to reaching the Water Reclamation Facility from 5 to 2. Removal of the Lift Station will also aid in facilitating the development of land in the southeast corner of the Prairie Avenue / Idaho Street Intersection.
7) Prairie Falls II Lift Station: This Lift Station was originally installed as a temporary facility, to allow for the development of the Prairie Falls 6th and 7th Additions to Post Falls. Decommissioning of the Lift Station will reduce the number of times sewerage from the adjoining subdivisions is pumped, prior to reaching the Water Reclamation Facility from 4 to 2. Removal of the Lift Station will also aid in facilitating the development of land located in the southeast corner of Prairie Avenue / Idaho Street Intersection.
8) Riverside Harbor Lift Station: Increase pumping capacity (700 gallons / minute capacity), and provide additional emergency storage capacity.
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BUILD-OUT MODEL
The Build-out Model uses the Existing System Model with additional design pipes, which are located to provide sanitary sewer service to all undeveloped areas within the Model’s service area (as shown on Exhibit S-A, Plan Area). All Land Use Area fields are set to their maximum settings of population and commercial flow, and are based on the City’s projected land use densities at full development. Parameters are set to have the Model indicate sizing and future flows rates through the predicted design areas. These results help the City to determine future upgrades, and how flows would need to be conveyed back to the Water Reclamation Facility. Results from the Build-out Model run indicate the impacts of growth, in the patterns anticipated, will require the following system upgrades and replacements to continue providing sufficient system capacity:
1) 12th Avenue Lift Station (Crimson King Lift Station): Rebuild the existing Lift Station
to increase pumping capacity and emergency storage (2,560 gallons / minute capacity). This project will also require the construction of two 16-inch force mains from the Lift Station to the Water Reclamation Facility. Upon completion, this facility will function as a Regional Lift Station. It will serve approximately 2,216 acres, or generally all land between 16th Avenue and Prairie Avenue (north / south), and Cecil Road and Huetter Road (east /west). Rapid growth in the service area of this Lift Station could trigger the need for improvements sooner than the date identified within the Capital Improvement Plan; however, due to the projected cost of the project, financial resources may not be available at a sooner time. This could result in limitations to growth in the area until the project can be financed and constructed.
2) Installation and extension of new sanitary sewer trunk mains to facilitate continued growth and land development:
3) The Build Out Model identifies seven (7) lift stations that are required for providing service to future developments or annexation areas and whose funding is currently identified as being provided by Developer expenditures:
a. Huetter Lift Station – The Huetter Lift Station has a build out capacity estimated at 0.70 cfs. This lift station will be located near the intersection of Huetter Road and Maplewood Avenue. The station will serve most of the existing City of Huetter and flow from the Highlands II lift Station. Development of this lift station will most likely be triggered by the construction of the Highlands II Lift Station, or annexation to the City of Post Falls and major redevelopment of the Huetter area. This lift station is not anticipated to be constructed prior to 2030.
b. Breezy Way Lift Station – The Breezy Way Lift Station has a build out capacity estimate at 0.05 cfs. This lift station will be located near the east end of Breezy Way, southwest of the existing McGuire Lift Station near the Spokane River. The station will serve an area already developed with river front homes. Development of this lift station will most likely be triggered by annexation. This lift station is not anticipated prior to 2030.
c. Iron Horse Road Lift Station - The Iron Horse Lift Station has a build out capacity estimate at 0.03 cfs. This lift station will be located near the east
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end of Caboose Court. The Station will serve an area already developed Mobile home park that is located within the municipal boundary of the City of Post Falls. Discharge from the lift station will go to the existing McGuire Lift Station. Development of this lift station will most likely be triggered by redevelopment of the mobile home park or failure of the existing septic facilities located within the mobile home park. This lift station is not anticipated prior to 2030.
d. Highlands II Lift Station- The Highlands II Lift Station has a build out capacity estimate at 0.70 cfs. This lift station will be located north of Interstate-90 near the existing rest area. The Station will serve an undeveloped area south of Mullan Avenue between the Highlands Golf Course and Huetter Road. Discharge from the lift station will go to the service basin of the future
e. Huetter Lift Station - Development of this lift station will most likely be triggered by annexation and development of the existing lands. Additional design alternatives may exist to gravity flow from this location, under Interstate 90, and by passing the Huetter Lift Station. This lift station is not anticipated prior to 2030.
f. Riverbend / Hanson Lift Station – The Riverbend / Hanson Lift Station has a build out capacity estimate at 0.43 cfs. This lift station will be located south of interstate-90 and west of the Beck Road Interchange. The Station will serve an area of approximately 122 acres that is currently undeveloped but is anticipated, upon annexation, to develop as a commercial retail / business park site. Discharge from the lift station will go to the service basin of the existing Jacklin Lift Station. Development of this lift station will most likely be triggered by subdivision of the underlying property. This lift station is anticipated between 2020 and 2030.
g. Killdeer Lift Station - The Killdeer Lift Station has a build out capacity estimate at 0.08 cfs. This lift station will be located west of Greensferry Road and just south of Prairie Avenue. The Station will serve an area of approximately 25 acres currently located within the City boundaries and is undeveloped. Discharge from the Lift Station will go to the 3rd Avenue Lift Station’s Service Area. Development of this lift station will most likely be triggered with subdivision activity in the surrounding area. This lift station is not anticipated prior to 2030.
h. Hibbs Lift Station - The Hibbs Lift Station has a build out capacity estimate at 0.02 cfs. This lift station will be located north of Poleline Avenue between Meyer Road and Huetter Road. The Station will serve the already developed area of Big Sky Estates, a subdivision of 5-acre rural estate properties, located outside of the City’s current boundaries. Discharge from the Lift Station will go to the 12th Avenue Lift Station’s service area. Development of this lift station will most likely be triggered by annexation of the area and the failure of the existing septic facilities. This lift station is not anticipated prior to 2030.
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SECTION 5 CAPITALIZATION PLAN The Capitalization Plan was formulated; based on the results of the current system modeling, projected collection system needs, and the available and projected finances. This Capitalization Plan prioritizes projects from the projected growth patterns, operations needs of the existing system, and constraints within the revenue stream. Funding for the expansion, operation, maintenance, and replacement of the City of Post Falls Water Reclamation Collection System comes from three (3) major main sources: developer contributions, capacity fees, and user fees.
Developer Contributions
Within the City of Post Falls, requirements for the design and construction of new water reclamation collection and transmission facilities is premised on the principle that the expansion of facilities to accommodate new growth should not present an additional financial burden on the utility rate payers, or tax payers of the City. When a new project is proposed for construction, the developer is responsible for providing the necessary infrastructure to serve their project. This work will include the extension of sanitary sewer mains that conform to the Water Reclamation Collection System Master Plan for size, depth, and location. The developer’s responsibility includes extension of services from the pre- existing sewer system to the project, and then to the opposite end of the project to facilitate future extensions. This responsibility, also known as a “to and through” requirement, allows for the continuation of services to adjoining lands in conformance with the Master Plan. If the identified facilities from the Master Plan are being extended at a greater depth or a larger diameter than is required to service the development, the developer may request and receive reimbursement (referred to as over-sizing), for those additional costs. Further discussion of funding for over-sizing is discussed under 652 Capitalization Fees. There are seven (7) lift stations identified in the Plan that are required for providing service to future developments or annexation areas, and whose funding is currently identified as being provided by Developer expenditures. Huetter Lift Station Iron Horse Road Lift Station Highlands II Lift Station Riverbend / Hanson Lift Station Hibbs Lift Station Killdeer Lift Station Breezy Way Lift Station A detailed description of each of these lift station locations, anticipated sizing requirements, and projected installation time frame are provided in Section 4 (Collection System Model – Build-Out Model). 652 Capitalization Fees With each new building permit, Sewer Capitalization Fees are assessed and collected. Capitalization fees are utilized to offset the capital cost to mitigate each new structure or facility’s impact to the capacity of the Water Reclamation Facility (Treatment) and Collection
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System (Sewer Mains, Lift Stations, and Force Mains). The mitigation measures for collection systems are generally limited to expansion of regional lift stations, and providing for improvements to sewer mains beyond the minimum sizing or extension required by an individual project to serve its self. At the start of Fiscal Year 2011-2012, the City had $1.6 million in the 652 Capitalization Fee accounts. Capitalization Fees are determined by analyzing planning level costs for all projects necessary, to provide additional capacity to the water reclamation collection and treatment facilities within a predetermined time frame. Costs are then divided by the projected increases in sewerage flow from growth, to establish a Capitalization Fee on a cost-per-service unit basis. The City of Post Falls has established a base service unit (SU) of 5,000 gallons of waste water per month. A typical dwelling unit of 1,000 square feet or less is assumed to produce 1 service unit of sewerage per month. A single-family dwelling unit in excess of 1,000 square feet is assumed to generate 1.27 service units (6,350 gallons) of waste water per month. Commercial uses are charged capitalization fees on a per- service-unit basis; which is estimated from historical water consumption data of similar uses within the City of Post Falls, or data provided from other jurisdictions of similar facilities. The established Capitalization Fee is adjusted annually, effective October 1, with the City’s budget based upon the ENR (Engineering News Record) Construction Cost Index. The current Capitalization Fee in effect for the 2011-2012 budget year is $4,659.32 per service unit. At present, the portion of Sewer Capitalization Fees utilized for Collection Systems represents approximately 36% of the total Capitalization Fee. Historical Capitalization Fee Distribution
BUDGET YEAR SEWER CAP FEE BASE / SU SEWER CAP FEES (COLLECTED)
TREATMENT COLLECTIONS
2007-2008 $ 4,232.63 $1,934,179.62 $ 1,169,706.07 $ 764,473.55
2008-2009 $1,796,357.60 $ 1,138,304.55 $ 658,053.05
2011-2012 $ 4,659.32
Sewer Main Over-sizing If the identified facilities from the Master Plan are being extended at a greater depth or a larger diameter than the minimum size necessary to provide service to the development; the Developer may request and receive reimbursement for those additional costs, due to said additional depth or additional sizing. The Water Reclamation Collection System Master Plan projects 48,768 linear feet of oversized sanitary sewer main will need to be constructed between 2010 and build out. Since 2005, the City of Post Falls has generally budgeted $150,000 per year towards the cost of pipe line
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oversizing. Actual expenditures over the last five years have varied between $2,000 and $397,000; with typical annual expenditures of less than $27,000. For future estimating purposes an annual expenditure towards oversizing of $20,000 per year was utilized. Sewer Collection System Oversizing PIPE DIAMETER PIPE COST (PER LINEAR
FOOT – INSTALLED) OVERSIZING COST (PER LINEAR FOOT – INSTALLED)
PIPE TO BE CONSTRUCTED (LINEAR FEET) PER 2011 MASTER PLAN
ESTIMATED TOTAL COST FOR OVERSIZING
8-inch $ 20 N/A N/A $ 0.00
10-inch $ 28 $ 8 24,413 $ 196,000
12-inch $ 35 $ 15 5,790 $ 87,000
15-inch $ 44 $ 24 14,463 $ 348,000
18-inch $ 53 $ 33 4,102 $ 136,000
Totals: 48,768 feet $767,000
652-463.3105.95520 ACTUAL OVERSIZING
2006-2007 $ 321,000.00 $0.00
2007-2008 $ 150,000.00 $ 397,257.07
2008-2009 $ 150,000.00 $ 1,467.63
2009-2010 $ 150,000.00 $ 26,342.00
2010-2011 $ 150,000.00 $ 4,873.31
2011-2012 $ 150,000.00 $ 22,200.00
$ 20,000.00
Average Annual Expenditure: $ 75,357 Sewer Surcharge Sanitary sewer surcharges are an additional fee, beyond normal capitalization fees, charged with issuance of building permits within a defined boundary, generally a subdivision. When a project is located in an area that is not readily serviced by existing sanitary sewer infrastructure in conformance with the Water Reclamation Collection System Master Plan, the cost of initially providing service in conformance with the Master Plan can be cost prohibitive to the development of the project. Occasionally, other sewer facilities exist near a proposed project that has current excess capacity, and would allow for temporary service to a project. In such cases, the City may enter into an agreement with the developer to establish a sewer surcharge
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that will allow for the temporary re-routing of flows from the proposed project to the existing sewer system. This also provides financial assurance to aid in the provision of facilities conforming to the Master Plan, when required by further development of the surrounding area.
FOXTAIL The Foxtail Subdivision is utilizing sewer facilities that discharge into the SH41 trunk line and currently, on a temporary basis, utilize pumping facilities located south of Interstate 90. Development of properties along the highway 41 corridor and within the foxtail subdivision will eventually require the modification of the 12th Avenue lift station to pump, in conformance with the master plan, to directly pump to the water reclamation facility. In addition, development of later phases of the Foxtail Project will require construction of a sewer main within Meyer Rd. from the 12th Avenue Lift Station to the Fox Tail Project. The Foxtail Sewer Surcharge is $3,315.64 (per service unit Oct. 2012, to be adjusted annually by the ENR Index).
CROWN POINTE The Crown Pointe Subdivision is located in the northwest corner of the intersection of Prairie Ave. and Spokane St. The project is 110 acres and has a build out population estimated at 650 residential dwelling units. The property was identified within the Rathdrum Prairie Waste Water Master Plan as having a large regional lift station that served a large portion of the Rathdrum Prairie and would pump sewerage directly to the Water Reclamation Facility. The cost of building even a small lift station sized for the Crown Pointe project along with the required force main that would exceed over 2 miles In length was cost prohibitive for the project. The Developer entered into an agreement with the City to use temporary facilities at the Guy Rd. Lift Station to serve the Crown Pointe project. Surcharge fees were determined for the project to pay its proportionate share of costs to facilitate the abandonment of the Howell Lift
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Station (temporary lift station installed with the Prairie Meadows Subdivision), and install necessary gravity lines and station improvements to the Montrose Lift Station, to handle the projected flows from Crown Pointe in its latter stages of build out. The Crown Pointe Sewer Surcharge is $693.15 (per service unit Oct. 2012, to be adjusted annually by the ENR Index).
650 Replacement Fund
The 650 Replacement Fund is funded from a portion of the fees collected from utility member’s monthly billings. This fund is utilized to cover the costs of replacing the City’s Water Reclamation Collection System, as portions of the existing system reach the end of their useful life. These funds cannot be utilized to pay for system expansions required by growth.
As of December 2011, the City of Post Falls had a balance in the 650 Replacement Fund of $5.5 million; however, the City has an identified depreciation balance of $17.1 million. During the development of the Capital improvement Plan; it was identified that the development of a Capital Improvement Plan should work towards fully funding the required depreciation balance, while still reasonably funding anticipated replacement needs within the collection system.
Pipe Replacement funded by the 650 Fund was included within the Capitalization Plan, by identifying expenditures towards pipe replacement of $100,000 per year commencing in the 2016 fiscal year, and escalating to $300,000 per year in fiscal year 2033. The City of Post Falls’ Water Reclamation Collection System is considered relatively new, with the oldest parts being installed in the 1980’s and being only one third into their project life span. If the City was to allocate 1% of the estimated replacement cost of the entire Water Reclamation Collection System towards pipe replacement each year, this would represent $1.4 million per year. However, there are many variables affecting the life of sewer mains and their replacement costs. Though expenditures for pipe replacement are not anticipated to be significant at this time, identification of funding towards pipe replacement was deemed valuable, as any unused funds would build upon the depreciation balance.
Capital Improvement Plan
The Capital Improvement plan was assembled using projected revenues from the 652 Capitalization Fees and Utility Rates (650 Replacement Fund), with the anticipated costs created from growth and facility age. Expenditure of 652 funding was only allowed for expansion of lift stations as impacted by growth, and for over-sizing sewer mains to be in conformance with sizing indicated within the Master Plan. Expenditure of 650 funding was only allowed for replacement of existing equipment or facilities, due to age related failure.
Based on analysis of revenues from the 652 Capitalization Fees accounts from 2006 thru 2011; with the model’s base assumption of a continued 2.5% growth rate, the Capital Improvement Plan anticipates a revenue stream of $350,000 per year.
Based on analysis of revenues from the 650 Replacement Fund (Collections) from 2006 through 2011 and assuming that the expenses for operations would remain level, the Capital Improvement Plan anticipates a revenue stream of $520,000 per year.
From the developed plan expenditures were constrained so that the 652 Fund balance would remain above $400,000, and the 650 Replacement Fund (collections) would see positive growth towards the depreciation balance.
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The attached Capital Improvement Plan project priority lists are separated into three (3) categories:
High Priority – Projects anticipated to be required between now and the year 2017. Medium Priority - Projects anticipated being required between the years 2018 and 2022. Low Priority - Projects anticipated being required between the years 2023 and 2040.
Scheduled projects within each list are projected to be required; based upon a combination of anticipated growth, available funding for improvements, and the timing of improvements relative to other projects. Variable Projects – Variable projects include the replacement of pumps and electronic controls, due to existing equipment age. In general these projects cannot be projected for an exact year of work, as the operating philosophy has been to replace individual pumps and controls on an as-needed basis. In order to quantify the anticipated financial impact of these projects, it has been assumed that regional lift stations have a pump life expectancy of 10 years and a life expectancy for the control systems of 20 years. Local lift stations are assumed to have a pump life expectancy of 20 years and a life expectancy for the control systems of 40 years. Variable projects within the project funding source summary tables have been highlighted in green, and the project date identifies an estimated time frame to gauge relative impacts to budgets. On the prioritization location maps, variable projects are identified as “miscellaneous replacement” and have a trigger of “equipment age” or “development / facility age”. Regional Lift Stations
3rd Avenue 4th Avenue 12th Avenue Idahline Greensferry Montrose Ponderosa Fisher
Estimated Pump Replacement Schedule – 10 years Estimated Electrical / Controls Replacement Schedule – 20 years
Local Lift Stations Beck Jacklin Corbin Howell*
Pioneer Ridge* Guy Grayling* Prairie Falls I
Prairie Falls II* Seltice McGuire Mazda
Bentley Wide River Ranch Shore Pines Tullamore
Highlands Ohio Match Riverside Harbor Kiwanis Park**
Falls Park**
*Temporary Lift Station – Scheduled for decommissioning.
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**Private Lift Station owned by Post Falls Park Department with maintenance performed by the
Post Falls Public Services Department – Water Reclamation Division. Improvements are subject to funding by the Post Falls Parks Department.
High Priority Projects - Scheduled: 2012-2017 $ 4,936,500 2013
3rd Avenue Pumps, electrical, emergency storage $ 1,145,500 2014
Idahline 20” Force main to Water Reclamation Facility $ 2,320,000 2015
Corbin Pump, electrical, isolation valve $ 326,250 McGuire Re-build Lift Station $ 304,500 Beck Capacity Improvements $ 442,250
2016 Jacklin Rebuild Lift Station $ 398,000
High Priority Projects - Variable: 2012-2017 $ 125,416 / year
Ohio Match Site improvements and pipe over-sizing $ 18,000 Howell Pump replacement $ 24,000 Highlands Pump replacement $ 24,000 **Falls Park Electronic upgrades $ 6,000 **Kiwanis Park Site modifications $ 6,000 4th Avenue Pump replacement $ 100,000 Jacklin Pump replacement electrical modifications $ 50,000 Seltice Pumps and Generator $ 156,000 Wide River Ranch Pump replacement $ 12,000 Pioneer Ridge Pump replacement $ 60,000 Ponderosa Pump replacement $ 203,000 ** Parks Department – not included in total annual projection
Medium Priority Projects – Scheduled: 2017-2022 $ 3,719,000 2018
Howell Decommission – gravity line extension $ 1,616,500 2019
Montrose Capacity upgrades $ 732,250 2020
Fisher Capacity upgrades $ 246,500 Ponderosa Capacity upgrades and emergency storage $ 377,000
2021 Riverside Harbor Pumps, Emergency Storage $ 659,750 Prairie Falls II Decommission $ 29,000 Grayling Decommission $ 29,000 Pioneer Ridge Decommission $ 29,000
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Medium Priority Projects – Variable: 2016-2020 $ 153,320 / year
Ohio Match Pumps and Generator $ 101,500 Shore Pines Pumps and Electronics $ 26,100 Idahline Pumps $ 180,000 Greensferry Pumps $ 180,000 4th Avenue Electrical $ 168,000 ** Kiwanis Park Pumps – Parks Dept $ 12,000 Prairie Falls I Pumps $ 24,000 Mazda Pumps – Emergency Power $ 87,000 ** Parks Department – not included in total annual projection
Low Priority Projects – Scheduled: 2021-2040
2033 12th Avenue Capacity Improvements and Force main $ 8,446,250
2034 SCADA $ 725,000
Low Priority Projects – Variable: 2021-2040 $ 170,806 / year
Bentley Pumps $ 24,000 3rd Avenue Pumps and Electrical $ 499,000 Stateline Pumps $ 24,000 ** Falls Park Pumps – Parks Dept $ 12,000 Guy Pumps $ 24,000 Tullamore Pumps $ 54,000 Corbin Pumps $ 108,000 Ponderosa Pumps $ 288,000 Highlands Pumps and Electrical $ 87,000 McGuire Pumps $ 24,000 Wide River Ranch Pumps $ 12,000 Seltice Pumps and Electrical $ 275,500 Jacklin Pumps $ 72,000 Fisher Pumps $ 54,000 Montrose Pumps $ 108,000 Ohio Match Pumps $ 48,000 Shore Pines Pumps $ 7,200 Greensferry Pumps and Electrical $ 512,500 ** Parks Department – not included in total annual projection
Pipe replacement 2013 – 2033 $ 100,000 per year (total $2,000,000)
Pipe replacement 2034- 2040 $ 300,000 (total $ 1,800,000)
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Basis for pipe replacement costs:
Gravity sewer replacement cost (average cost per foot of repair / replacement) $180 per foot
Pipe - $32
Trench excavation / bedding / backfill - $33
Manholes - $8 (proportional cost with 1 manhole at $2,500 per 300 linear feet of sewer
main)
Roadway - $45 (3-inches of asphalt on 4-inches of base, Asphalt cost at $75/ton, Aggregate $25
ton)
Engineering / contingency - $56 (45% of identified construction costs – 15% Engineering Design,
10% Engineering Project Management, 5 % Miscellaneous and 10% contingencies)
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2012 WATER RECLEMATION COLLECTION SYSTEM MASTER PLAN CIP EXHIBIT CPA
REVENUE AND EXPENDITURE FORECAST 652 CAPITALIZATION COLLECTIONS 650 REPLACEMENT COLLECTIONS FUND BALANCES
BUDGET YEAR REVENUE EXPENSES (total) Lift Stations Oversizing
REVENUE LESS 
20062007 1,128,568.75$       1,874,325.71$               1,846,917.71$      $593,878.74 $                                      
20072008 764,473.55$           1,619,799.89$               1,222,542.82$      397,257.07$       $601,477.60 $                                      
20082009 658,053.05$           211,933.37$                  210,465.74$          1,467.63$           $115,057.28 10,496.27$                           10,496.27$                 $                            
20092010 340,042.40$           939,201.62$                  912,859.62$          26,342.00$         $242,365.14 31,354.70$                           31,354.70$                 $                            
20102011 350,742.60$           28,286.43$                    23,413.12$            4,873.31$           $737,568.75 3,081.90$                             3,081.90$                   $                            
High Priority Projects thru 2017 EXHIBIT CPD
priority Project Cost 652 funds 650 funds 650 funds Parks / Other year of
(H / M / L) 2011 cap Replacement O&M construction
Ohio Match Lift Station  17 High 2012
Site maintenance and upgrades $15,000.00 $                          $                       15,000.00$          $                          site improvements with adjoing development
Total $18,000.00 includes engineering / mobilization / contingencies next pump replacement 2019
$                            $                         18,000.00$            $                           
$20,000.00 $                          20,000.00$           $                      $                          install flyght pump
Total $24,000.00 includes engineering / mobilization / contingencies
$                            24,000.00$             $                        $                           
Pump Replacement $20,000.00 $                          20,000.00$           $                      $                          install chopper pumps
Total $24,000.00 includes engineering / mobilization / contingencies next pump replacement 2035
$                            24,000.00$             $                        $                           
Falls Park Lift Station  FP High 2012 Funding from Parks Department
Install autodialer $5,000.00 $                          5,000.00$                
$                            $                         $                        6,000.00$                  
Kiwanis Park  Lift Station  22 High 2012 Funding from Parks Department
stie maintenance $5,000.00 $                          $                       $                      5,000.00$                 earthwork to reduce impacts from overflow
Total $6,000.00 includes engineering / mobilization / contingencies next pump replacement 2022
$                            $                         $                        6,000.00$                  
3RD & 4TH Ave.  Lift Station  8/11 High 2012 use 20" forcemain to WWTP
forcemain routing converstion $0.00 $                          $                       $                      $                          3rd and 4th Ave. Lift Stations pump in parallel
Total $0.00 includes engineering / mobilization / contingencies
4th Ave. Lift Station  11 High 2012
replace pumps $83,400.00 $                          $83,400.00 $                      $                         
$                            100,080.00$           $                        $                           
Interium improvements 40,000.00$        $                          40,000.00$           $                      $                          replace pump and redundant controls
Total 48,000.00$        includes engineering / mobilization / contingencies next pump replacement 2017
$                            48,000.00$             $                        $                           
replace pumps $10,000.00 $                          10,000.00$           $                      $                         
$                            12,000.00$             $                        $                           
3rd Ave. Lift Station  11 High 2013 improve capacity by 22% from 4.4 cfs to 5.7 cfs
Pump Upgrades $150,000.00 50,000.00$                 100,000.00$           $                        $                            Install 3 50 hp grinder pumps
New wet well 160,000.00$      35,000.00$                 125,000.00$           $                        $                            10x20x25
yard piping 100,000.00$      15,000.00$                 85,000.00$             $                        $                           
electrical upgrades 80,000.00$        15,000.00$                 65,000.00$             $                        $                           
Emergency Storage 210,000.00$      46,200.00$                 163,800.00$           $                        $                            55,000 gallons 22% due to growth (capacity)
Emergency Power 40,000.00$        $                          40,000.00$           $                      $                         
249,690.00$               895,810.00$           $                        $                           
Pump Replacement $50,000.00 $                          50,000.00$           $                      $                          corrosion, new pumps, new electronics
Total $60,000.00 includes engineering / mobilization / contingencies next pump replacement none  decommission 2021
$                            60,000.00$             $                        $                           
20" Forcemain to WWTP (Seltice Route) $1,600,000.00 $1,600,000.00 $                       $                          provide interconnect with Jacklin, Beck and  Corbin FM's
Total $2,320,000.00 includes engineering / mobilization / contingencies next pump replacement 2021
2,320,000.00$            $                         $                        $                           
Pump Replacement 50,000.00$        $                            50,000.00$             $                        $&