Water Facility Plan - PUMP 1 Amendment - DEQ APPROVED
M3 Eagle, L.L.C.
533 East Riverside Drive
Suite 110
Eagle, ID 83616
Spring Valley Water Facility Plan
PUMP #1 Amendment
May 2014
Prepared by:
J-U-B ENGINEERS, Inc.
250 South Beechwood Avenue
Suite 201
Boise, ID 83709
www.jub.com
Spring Valley Water Facility Plan – PUMP #1 Amendment i
Table of Contents
Section 1 ....................................................................................................................................... 1-1
Introduction ................................................................................................................................. 1-1
Project Description.................................................................................................................... 1-1
Project Location ........................................................................................................................ 1-2
Background ............................................................................................................................... 1-3
Objective ................................................................................................................................... 1-3
Facility Plan Organization ........................................................................................................ 1-3
Resources and Planning Documents ......................................................................................... 1-3
Abbreviations ............................................................................................................................ 1-4
Section 2 ....................................................................................................................................... 2-1
Planning Assumptions and Development Details ..................................................................... 2-1
Planning Assumptions .............................................................................................................. 2-1
Planning Period ..................................................................................................................... 2-1
Service Area Boundary ......................................................................................................... 2-1
Existing Conditions ................................................................................................................... 2-1
Preliminary Site Layout ............................................................................................................ 2-1
Site Topography ........................................................................................................................ 2-2
Pressure Zone Configurations ................................................................................................... 2-2
Sewer System ............................................................................................................................ 2-2
Section 3 ....................................................................................................................................... 3-1
Water Supply ............................................................................................................................... 3-1
Anticipated Water Quantity ...................................................................................................... 3-1
Anticipated Water Quality ........................................................................................................ 3-1
Proposed Well Locations and Estimated Production Rates ...................................................... 3-2
Water Rights ............................................................................................................................. 3-2
Section 4 ....................................................................................................................................... 4-1
Potable Water Demands ............................................................................................................. 4-1
Background ............................................................................................................................... 4-1
Water Demand Determination .................................................................................................. 4-1
Indoor Demands .................................................................................................................... 4-1
Spring Valley Water Facility Plan – PUMP #1 Amendment ii
Irrigation Demands ............................................................................................................... 4-2
Equivalent Dwell Unit (EDU) Determination ...................................................................... 4-6
Overall Potable Water Demands for PUMP #1 .................................................................... 4-7
Comparison of Potable Water Unit Demands ........................................................................... 4-7
Water Demands per Pressure Zone ........................................................................................... 4-8
Water Demands per Phase ........................................................................................................ 4-8
Idaho Administrative Code, Department of Environmental Quality ........................................ 4-8
Fire Flows ................................................................................................................................. 4-9
Section 5 ....................................................................................................................................... 5-1
Water Facility Planning ............................................................................................................. 5-1
Water Facility Planning Criteria ............................................................................................... 5-1
Service and Operational Requirements ................................................................................. 5-1
Potable Water Wells ............................................................................................................. 5-2
Finished Water Storage ......................................................................................................... 5-2
Pumping Stations .................................................................................................................. 5-3
Pressure Reducing Station .................................................................................................... 5-4
Backbone Distribution Pipelines ........................................................................................... 5-4
Build-Out Water Facility Plan .................................................................................................. 5-5
Water Facilities per Pressure Zone ........................................................................................... 5-6
Pressure Zone 2800 ............................................................................................................... 5-6
Pressure Zone 2910 ............................................................................................................... 5-6
Pressure Zone 3020 ............................................................................................................... 5-6
Pressure Zone 3130 ............................................................................................................... 5-7
Pressure Zone 3200 ............................................................................................................... 5-7
Phased Water Facility Plan ....................................................................................................... 5-8
Cost Analysis ............................................................................................................................ 5-9
Alternative Facility Analysis .................................................................................................... 5-9
Declining Balance Report ......................................................................................................... 5-9
Section 6 ....................................................................................................................................... 6-1
Technical, Managerial, and Financial Capacity ...................................................................... 6-1
TABLES
Table 4.1: Average Day Demand Factors & Assumptions for PUMP #1 .................................... 4-2
Table 4.2: Irrigation Average Day Demand Factors & Assumptions ........................................... 4-5
Table 4.3: Irrigation Maximum Day Demand Factors & Assumptions ........................................ 4-6
Table 4.4: Overall Potable Water Demands for PUMP #1 ........................................................... 4-7
Table 4.5: Other Local & Western U.S. Region Communities ..................................................... 4-8
Table 4.6: Maximum Day Potable Water Demands per Pressure Zone........................................ 4-8
Spring Valley Water Facility Plan – PUMP #1 Amendment iii
FIGURES
Figure 4.1 Irrigation Approaches Across PUMP #1
Figure 5.1 PUMP #1 Proposed Infrastructure and Well Locations
Figure 5.2A 2910 Pressure Zone Proposed Infrastructure (Conceptual Alternative A)
Figure 5.2B 2910 Pressure Zone Proposed Infrastructure (Conceptual Alternative B)
Figure 5.3A 3020 Pressure Zone Proposed Infrastructure (Conceptual Alternative A)
Figure 5.3B 3020 Pressure Zone Proposed Infrastructure (Conceptual Alternative B)
Figure 5.4 Hydraulic Schematic of PUMP #1
Figure 5.5A Hydraulic Schematic (Conceptual Alternative A)
Figure 5.5B Hydraulic Schematic (Conceptual Alternative B)
APPENDICES
Appendix A - References ............................................................................................................. A-1
Appendix B - Hydraulic Simulation – Run #1 ............................................................................. B-1
Appendix C - Hydraulic Simulation – Run #2 ............................................................................. C-1
Appendix D - Hydraulic Simulation – Run #3 ............................................................................ D-1
Appendix E - Hydraulic Simulation – Run #4 ............................................................................. E-1
Appendix F - Common Areas / Open Space Irrigation Demands from Potable Ssytem……….F-1
Appendix G – Opinion of Probable Cost for PUMP #1 Improvements………………………..G-1
Spring Valley Water Facility Plan – PUMP #1 Amendment 1-1
Section 1
Introduction
Project Description
The description of the Spring Valley Development included in the Facility Plan remains accurate
and provides a broad description of the development. Planned Unit Master Plan (PUMP) #1 for
Spring Valley is a small portion of the overall development and includes approximately 232
acres. PUMP #1 is planned to include 232 single family detached dwellings, a clubhouse and
recreation center, and a sales office. No additional commercial development is included in
PUMP #1.
PUMP #1 will initially consist of portions of the 2800 and 2910 Pressure Zones as identified and
described in the Facility Plan. In the Facility Plan, both of these Zones were to be supplied water
from Zone 3020 via pressure reducing valve stations. The Facility Plan contemplated this portion
of the development being constructed either after, or simultaneously with Zones 2910 and 3020.
Given the current planned phasing for the development, the wells included in Zone 3020 of the
Facility Plan will not be available for PUMP #1. Given this situation, modifications to the
Facility Plan to include at least two well sources directly connected to PUMP #1 improvements is
necessary to meet the requirements of IDAPA. This amendment to the Facility Plan is intended
to examine and evaluate the potential impacts to the overall Facility Plan that result from the
revised phasing of the development and the current plan to provide water sources connected to
the lower pressure zones.
The proposed water system for PUMP #1 includes modifications to the Facility Plan to allow the
2910 Pressure Zone to serve as the receiving zone for most or all of the well source capacity to
provide additional system flexibility in regards to well locations, water main sizing, and capacity.
This approach also allows for well placement based on actual testing results rather than arbitrary
spacing. This change in overall water system approach requires a number of changes in the
Facility Plan. Significant modifications include:
• Addition of a 24” transmission line directly connecting PUMP #1 and potential future
well sources completed to the southwest of PUMP #1.
Spring Valley Water Facility Plan – PUMP #1 Amendment 1-2
• Upsizing of primary transmission mains in the 2910 Pressure Zone to accommodate the
export of water from the 2910 Pressure Zones to the future 3020 Pressure Zone.
• Change in system operations that will require water to be lifted from the 2910 Pressure
Zone to the 3020 pressure zone. Two conceptual approaches are discussed in this
amendment.
o Replacement of the three primary pressure reducing stations connecting the 2910
and 3020 Pressure Zones with booster pump stations to accommodate export of
water from the 2910 Pressure Zone to the upper zones.
o Provide storage on the 2910 Pressure Zone with an associated booster pump
station to lift water to the 3020 storage reservoir.
With these modifications to the Facility Plan, the reliance on well capacity within a limited area
in the 3020 Pressure Zone included in the Facility Plan is largely relieved and provides greater
flexibility in well source location as well as reduced well density. From an infrastructure
standpoint, the modifications are small compared to the changes in overall system operation.
As a result of the changes in system operation that are included in this amendment, the
operational schematics of the system included in the Facility Plan will become invalid and will no
longer be relevant for the long term planning of the water system for subsequent PUMPs. To
address this deficiency and to streamline future reviews by IDEQ and the City of Eagle, a revised
Facility Plan will be prepared and submitted concurrently with the PUMP #2 submittal to the City
of Eagle. This revised Facility Plan will include the entire development and detail the approach
that will be used to provide water service throughout. Information collected from the
construction of the initial production wells for the project will also be incorporated in the new
Facility Plan and used to estimate future well locations and yields.
This amendment also includes additional refinement of the potable water system demands for
PUMP #1 to reflect the approach to irrigation of residential lots and common spaces that is being
developed as part of the Irrigation Master Plan that M3 is preparing.
Project Location
PUMP #1 is located in the southwest portion of the development as presented in the Facility Plan.
Spring Valley Water Facility Plan – PUMP #1 Amendment 1-3
Background
The proposed Spring Valley water system is defined as a “community” water system, per IDAPA
58.01.08.003.10. Thus a facility plan is required to be submitted to IDEQ for review and
approval. As defined in IDAPA 58.01.08 Section 003, the Facility Plan is a comprehensive
planning document for infrastructure and includes a plan for the future of the system/facility,
including upgrades and additions. It is usually updated on a regular basis due to anticipated or
unanticipated growth patterns, regulatory requirements, or other infrastructure needs.1
The Facility Plan has been approved by IDEQ. As stated throughout the Facility Plan, it was
understood that additional engineering analysis and planning would be needed for individual
PUMPs as the development progresses. This amendment to the Facility Plan is intended to
satisfy this requirement as a more detailed examination and evaluation of the improvements
planned for PUMP #1 and to relate the improvements to the information contained in the Facility
Plan. Additionally this amendment addresses the issue regarding the appropriate maximum day
demand for design purposes discussed in detail in the Facility Plan and this amendment.
Objective
The objective of this Facility Plan Amendment is to examine the proposed water system for
PUMP #1 in greater detail than included in the Facility Plan and to identify any changes in the
overall system planning that are incorporated in PUMP #1 and to describe the impacts of any
changes to the information provided in the Facility Plan.
Facility Plan Organization
This amendment is organized to follow the structure of the Facility Plan and follows the same
general outline. Instead of restating information from the Facility Plan that remains current and
valid, the amendment is focused on items that are different or modified from the Facility Plan.
Appendices are included to provide references, supporting calculations, modeling results, and
information relevant to this amendment. Reference is also made in this report to information
included in the Appendices of the Facility Plan.
Resources and Planning Documents
The following resources and planning documents were used in the preparation of this Facility
Plan Amendment. These reference files are located in Appendix A.
• Planning Unit Master Plan #1 dated 11/28/12, by Greey Pickett.
• Preliminary Plat for Phase 1dated 10/02/13, by JUB Engineers, Inc
1 IDAPA 58.01.03 – Idaho Rules for Public Drinking Water Systems, Idaho Administrative Code, 2008.
Spring Valley Water Facility Plan – PUMP #1 Amendment 1-4
Abbreviations
The following abbreviations are used in this Facility Plan:
AFY Acre-Feet per Year
ADD Average Day Demand
AWWA American Water Works Association
cfs Cubic Feet per Second
CWA Clean Water Act
D/DBP Disinfectants/Disinfection Byproducts
EA Environmental Assessment
EDU Equivalent Dwelling Unit
EPA US Environmental Protection Agency
EPS Extended Period Simulation
ft Feet
FY Fiscal Year
gpcpd Gallons per Capita per Day
gpd Gallons per Day
gpm Gallons per Minute
HGL Hydraulic Grade Line
HP Horsepower
IDAPA Idaho Administrative Procedures Act
IDEQ Idaho Department of Environmental Quality
ISO Insurance Service Organization
MCL Maximum Contaminant Level
MDD Maximum Day Demand
MG Million Gallons
MGD Million Gallons per Day
mg/l Milligrams per Liter
mgd Million Gallons per Day
O&M Operation and Maintenance
PHD Peak Hour Demand
PRS Pressure Reducing Station
PRV Pressure Reducing Valve
psi Pounds per Square Inch
PWS Public Water System
RAFN Reasonably Anticipated Future Needs
SDWA Safe Drinking Water Act
SH State Highway
SWTR Surface Water Treatment Rule
TCR Total Coliform Rule
THMs Trihalomethanes
USEPA US Environmental Protection Agency
USGS US Geological Survey
WWTP Wastewater Treatment Plant
Spring Valley Water Facility Plan – PUMP #1 Amendment 2-1
Section 2
Planning Assumptions and Development Details
This section includes the planning assumptions and development details used for conceptual
water facilities for PUMP #1.
Planning Assumptions
The planning assumptions for PUMP #1 remain as stated in the Facility Plan. Additional
information specific to PUMP #1 is included below:
Planning Period
PUMP #1 is the initial phase of the overall development including 232 residential lots. The
planning period for the PUMP #1 water system improvements is expected to be less than 5
years although may extend further in response to market conditions.
Service Area Boundary
The service area evaluated in this amendment includes all of PUMP #1 as depicted on the
figures included in Appendix A. The overall service area for the development remains
unchanged from what is presented in the Facility Plan.
The service area for PUMP #1 consists of approximately 232 acres.
Existing Conditions
The existing site conditions remain as described in the Facility Plan
Preliminary Site Layout
The site layouts used in this Facility Plan Amendment are the same as included in the Preliminary
Plat Application submitted to the City for much of the area within PUMP #1. Conceptual lot
layouts included in Appendix A were used to estimate lot configurations within the model for
areas not included in the referenced Preliminary Plat but still a part of PUMP #1. Preliminary
grading plans were used to estimate lot elevations in the included modeling.
Spring Valley Water Facility Plan – PUMP #1 Amendment 2-2
Site Topography
PUMP #1 is located in the southwest portion of the overall development and includes both
relatively flat agricultural ground and the first tier of foothills that rise approximately 150 feet
above the valley. The lowermost portions of PUMP #1 are at an elevation of approximately
2580 and the highest portions at 2750.
Pressure Zone Configurations
The Facility Plan evaluated three alternative pressure zone configurations. Alternative # 3 as
shown in Figure 2.5 (of the Facility Plan) was selected in the Facility Plan and is used as a
reference for the planning associated with PUMP #1. This pressure zone configuration and
boundaries remains essentially unchanged by the operational changes presented in this
amendment. Even with the changes included herein, the five pressure zones and their
approximate limits as shown in the Facility Plan remain valid.
The Facility Plan established pressure zone boundaries based on a 50 psi static pressure for the
high elevation of the zone and a 100 psi static pressure for the low elevation. The resulting step
size between each pressure zone is 110 feet, which reduced the number of pressure zones but
requires individual PRV’s for service connections with static pressure greater than 80 psi.
The Facility Plan contemplated improvements associated with the 3020 pressure zone that would
be constructed during the initial stages of development and would feed down to the lower zones
via PRVs. However, PUMP #1 as currently contemplated is removed from the 3020 pressure
zone by a significant distance which precludes phased construction as contemplated in the
Facility Plan. Given these constraints, this Facility Plan Amendment proposes to make the 2910
zone the primary location for well sources and make other changes to allow water to be lifted
from the 2910 to the 3020 Pressure zones.
With the inherent flexibility provided by the revised system approach included in this amendment
and the potentially variable capacity and location of wells for future PUMPS, this Facility Plan
Amendment proposes constructing the initial improvements associated with PUMP #1 such that
the water system will have greater flexibility to accommodate future well locations and capacity
issues identified as the initial wells are constructed and performance monitored.
Sewer System
A Wastewater Facility Plan has also been developed for the Spring Valley project as well as a
Preliminary Engineering Report for the Phase 1A treatment and collection systems. These
documents have been approved by IDEQ.
Spring Valley Water Facility Plan – PUMP #1 Amendment 3-1
Section 3
Water Supply
A separate document has been prepared and submitted to IDEQ by Hydro Logic, Inc. (HLI) titled
“Aquifer Testing and Groundwater Quality of Existing and Future Wells for Spring Valley” that
provides substantial additional information regarding the planned well source water supply for the
development.
Anticipated Water Quantity
Detailed information regarding the anticipated source of water for the development and the
anticipated quantity of water is provided in the Facility Plan. Groundwater from the Pierce Gulch
Aquifer continues to be the major planned source of water for the Spring Valley development.
Since the development of the Facility Plan, additional drilling and hydrogeologic investigations
have been conducted. Most recently a pilot hole was drilled for Well #1 and a geophysical log
generated by HLI.
Initial evaluation of the pilot well project provides positive indications that well yields in excess
of 1,000 gpm may be achieved. Continued development of the well sources will be monitored as
each subsequent well is developed to establish a firm capacity for each source.
Anticipated Water Quality
The Facility Plan includes information regarding anticipated water quality. This information is
still believed relevant and water quality is expected to be adequate without treatment beyond
chlorination for the use proposed.
Spring Valley Water Facility Plan – PUMP #1 Amendment 3-2
Proposed Well Locations and Estimated Production Rates
The number of required wells is dependent upon the actual true yields of the wells. To satisfy
the fire flow and redundancy requirements for PUMP #1, three wells, each with a capacity of
approximately 1,000 gpm are necessary. HLI believes such yields are possible, but are not
guaranteed.
The Facility Plan included anticipated well capacities between 1,000-2,000 gpm and the hydraulic
modeling was based on well capacities of 2,000 gpm. As currently planned, the water system for
PUMP #1 will initially be served by three wells. Given the planned well diameters, well
capacities of approximately 1,000 gpm are anticipated.. Current planning for the drilling and
equipping of source wells includes construction of wells at two well sites. A single well is
planned for Well Site #1 and two wells are planned for Well Site #2.
Figure 5.1 includes a site layout plan that identifies the two different well sites that are potentially
under consideration for the construction of source water wells to serve PUMP #1 and the overall
development. These locations and future locations of wells will be subject to change as wells are
brought on-line and aquifer responses are monitored. This information will be used to identify
future well locations for subsequent PUMP’s.
Water Rights
The water rights for PUMP #1 are included in the overall water rights for the entire development
as described in the Facility Plan and no modifications are necessary for this amendment.
Spring Valley Water Facility Plan – PUMP #1 Amendment 4-1
Section 4
Potable Water Demands
Background
The M3 Eagle, LLC Second Amended Application for Water Right Permit, submitted to the
Idaho Department of Water Resources (IDWR) and IDWR’s second Amended Final Order dated
March 9, 2012, serves as the basis for all water demand calculations presented in the Facility
Plan. As noted in the Facility Plan, the initial phase(s) of the water system must incorporate a
maximum day indoor demand of 800 gpd/residence exclusive of irrigation and fire flow
requirements until such time that evidence of actual usage warrants use of a different value. This
amendment to the Facility Plan is intended to satisfy this requirement and the demands stipulated
by IDAPA 58.01.552.01a. are used in the hydraulic simulations included for PUMP #1 in this
amendment.
Water Demand Determination
Potable water demands for PUMP #1 in this amendment are based on values required by IDAPA
for maximum day demands exclusive of irrigation and fire flows that are almost twice as much as
those values presented in the Facility Plan as expected demands. Values presented in the Facility
Plan for irrigation and fire flows were used for the relevant demand calculations presented in this
amendment and are consistent with the overall planning for the development as depicted in the
Facility Plan and limitations imposed by the water right(s).
Indoor Demands
An average day demand of 533 gpd/residence was used for all residential lots included in
PUMP #1 to meet the requirements of IDAPA 58.01.552.01a. (when applied with a peaking
factor of 1.5 for maximum day = 800gpd/residence).
For the indoor demands related to the recreational center and the sales office included within
PUMP #1, the criteria included in the Facility Plan for commercial usage was used which is
1200 gpd/ac of gross. Structures associated with the facility are preliminarily planned to be
10,000-15,000 square feet with a gross equivalent area of up to 30,000 square feet.
The mechanical wastewater treatment plant will result in additional demands on the potable
water system. Table 11-1 in the approved PER identifies the anticipated average and peak
Spring Valley Water Facility Plan – PUMP #1 Amendment 4-2
flow requirements from the potable system necessary for operation of the treatment plant.
These demands were not included in the original Facility Plan but are incorporated in the
analysis completed for the development of this amendment. These demands are intermittent
in nature, but are incorporated in the hydraulic analysis of the system under peak day and
peak hour simulations
Table 4.1: Average Day Demand Factors & Assumptions for PUMP #1
Potable Water User Indoor Average Day Usage
Factors & Assumptions
Indoor Average Day Usage
EDU
Residential
533 gpd/unit*
232 units
1 unit = 1 EDU (standard)
General Office (Commercial)
1200 gpd/acre
0.7 acres of commercial area
0.44 acres = 1 EDU
Wastewater Treatment Plant 15 gpm (intermittent) N/A
* Based on 800 gpd/residence maximum day demand and peaking factor of 1.5 for average to peak
day.
The domestic peaking factors from average day demand to maximum day demand and peak
hour demand are as follows:
• Maximum Day = 1.50 x Average Day
• Peak Hour = 2.92 x Average Day
The peaking factors applied to the wastewater treatment plant demands are as follows:
• Maximum Day = 1.5 x Average Day
• Peak Hour = 7.0 x Average Day
The high peaking factor used for the peak hour is a result of the conservative assumption that
at peak hour virtually all of the components of the Phase 1A treatment plant that use potable
water are running at full capacity. This conservative approach was included to provide
assurances that plant operations will not adversely affect service to the rest of the
development as the plant grows. While the long term plan at the plant is to utilize treated
effluent for most plant processes as the level of treatment reaches class A and B effluent,
there will be periods where plant potable demands increase before these classes of effluent
are achieved.
Irrigation Demands
Irrigation demands are detailed in the Facility Plan and are based on the Average Day
Evapotranspiration (ET) and Maximum Day Diversion. The same methodology and
assumptions were used in developing potable water irrigation demands for PUMP #1.
The approved Facility Plan applied a broad assumption regarding the irrigation of both
residential lots and common spaces. In the Facility Plan, irrigation of all residential lots was
assigned to the potable water system and irrigation of all common areas was assigned to
recycled water, surface water, and groundwater taken from a source other than the potable
system. In general, this continues to be the primary approach for the development. However,
Spring Valley Water Facility Plan – PUMP #1 Amendment 4-3
for PUMP #1, this approach included in the Facility Plan is not as applicable. As such, this
amendment looks at PUMP #1 much closer and includes appropriate demand revisions.
Figure 4.1 was developed for this amendment to graphically illustrate the approach to
irrigation within the limits of PUMP #1. Items indicated on the figure include:
• The boundary of the Farmers Union Irrigation District service area is shown by the
dashed line.
• The blue hatched area indicates those areas that will be provided with a separate,
dedicated pressure irrigation system for the irrigation of both residential lots and
common spaces. Initially water from the Farmers Union Irrigation District will serve
as the primary source water for this system. The potable water system will be utilized
as the supplemental groundwater source through a metered service for the irrigation
of common spaces. For the residential lots, supplemental groundwater for irrigation
will not be provided through the dedicated pressure irrigation system that serves the
lots with surface water. However, it is recognized that when this dedicated irrigation
system is unavailable because of a lack of surface water, lot owners will continue to
irrigate, albeit on a somewhat limited basis, with water from the potable system. This
irrigation usage will be measured through the homeowner’s potable water meter and
charged in accordance with the potable water rates established by the City of Eagle.
When effluent of Class A or B quality is achieved, use of surface or groundwater to
irrigate common areas and open spaces will be phased out or reduced, but will
continue to be used to irrigate the residential “estate” lots planned for the blue
hatched area.
• For the area hatched in red, the approach to irrigation is consistent with the Facility
Plan. Residential lots will be provided irrigation water through the potable system.
Common areas and open spaces will initially be irrigated with surface water,
supplemented as necessary by groundwater that is not taken from the potable system.
Any necessary supplemental groundwater necessary for irrigation will be taken from
the Kling well that will be owned and operated by M3/HOA. M3 currently posseses
water right #63-10669 which is supplemental to the surface water rights provided
through the Farmers Union Irrigation District. The existing Kling well is planned to
be used in conjunction with right #63-10669 to provide supplemental irrigation water
to existing surface water when necessary in this area. When Class A and B effluent
is available for the irrigation of common spaces, it will be used in that manner and
the use of surface water and supplemental groundwater will be phased out or reduced
for the irrigation of common and open spaces.
• For the area hatched in green, the potable water system will initially be used to
provide irrigation water for both residential lots and common spaces. When Class A
or B effluent is achieved, recycled water will be used for the irrigation of common
and open spaces and the reliance on the potable system will be removed for irrigation
of these areas.
• For the area hatched in yellow, will include a dedicated pressure irrigation system for
the irrigation of both residential lots and common spaces. Water from the Farmer’s
Union Irrigation District will serve as the primary source of water for this system.
Any supplemental groundwater necessary for irrigation will be taken from the Kling
well that will be owned and operated by M3/HOA. M3 currently posseses water
right #63-10669 which is supplemental to the surface water rights provided through
Spring Valley Water Facility Plan – PUMP #1 Amendment 4-4
the Farmers Union Irrigation District. The existing Kling well is planned to be used
in conjunction with right #63-10669 to provide supplemental irrigation water to
existing surface water when necessary in this area
Table 4.2 details the potable water demand factors for calculating average day irrigation
demands. Table 4.3 details the potable water demand factors for calculating maximum day
irrigation demands.
Spring Valley Water Facility Plan – PUMP #1 Amendment 4-5
Table 4.2: Irrigation Average Day Demand Factors & Assumptions
Potable
Irrigation Usage
Type
Irrigation Average
Demand Factors &
Assumptions
Irrigation Average
Demand EDU ET Factors &
Assumptions *
Detached
Residential
(Standard Lots in
green and red
hatched area in
Fig 4.1 only)
190 units
2000 sq-ft/unit turf, 80%
efficient
1500 sq-ft/unit drip, 90%
efficient
1 unit = 1 EDU
(standard)
Average Day ET = 0.0136
ft/day
Average Day to Peak Hour
ET conversion for a 12 hour
irrigation cycle is 3.23
Detached
Residential
(Large Lots in
yellow hatched
area in Fig 4.1
only)
12 units
These lots will be provided
irrigation water from the
Farmers Union Irrigation
District.
Supplemental groundwater
from Kling well and right
#63-10669
1 unit = 2 EDU
Detached
Residential
(Large Lots in
blue hatched area
in Fig 4.1 only)
30 units
These lots will be provided
irrigation water from the
Farmers Union Irrigation
District.
Supplemental groundwater
from potable system.
4000 sq-ft/unit turf, 80%
efficient
3000 sq-ft/unit drip, 90%
efficient
1 unit = 2 EDU
Commercial
The area surrounding the
recreation center will be
provided irrigation water
from the Farmers Union
Irrigation District with
supplemental groundwater
from Kling well and right
#63-10669
N/A
Common Areas /
Open Spaces
(green and blue
hatched area in
Fig. 4.1 only)
See Appendix F**
14.6 acres (green)
27.5 acres (blue)
N/A
* Based on monthly ET values from Allen & Brockway (1983), presented in M3 Eagle, LLC,
Second Amended Application for Water Right Permit (Feb. 2008). See Appendix H of Facility Plan for
demand calculation excerpts from the application.
**Irrigation demands for open spaces and common areas were prepared by Coates Irrigation as part of the
Irrigation Master Plan being prepared by M3. Documentation of calculations and assumptions were provided
by Coates Irrigation and are included in Appendix F.
Spring Valley Water Facility Plan – PUMP #1 Amendment 4-6
Table 4.3: Irrigation Maximum Day Demand Factors & Assumptions
Potable
Irrigation Usage
Type
Irrigation Maximum
Demand Factors &
Assumptions
Diversion Rate *
Detached
Residential
(Standard Lots in
green and red
hatched area in
Fig 4.1 only)
190 units
3500 sq-ft/unit
0.02 cfs/acre
Detached
Residential
(Large Lots in
yellow hatched
area in Fig 4.1
only )
12 Units
These lots will be provided
irrigation water from the
Farmers Union Irrigation
District.
Supplemental groundwater
from Kling well and right
#63-10669
Detached
Residential
(Large Lots in
blue hatched area
in Fig 4.1 only)
30 units
These lots will be provided
irrigation water from the
Farmers Union Irrigation
District.
Supplemental groundwater
from potable system.
7000 sq-ft/unit
Commercial
The area surrounding the
recreation center will be
provided irrigation water
from the Farmers Union
Irrigation District with
supplemental groundwater
from Kling well and right
#63-10669
Common Areas /
Open Spaces
(green and blue
hatched area in
Fig. 4.1 only)
See Appendix F**
14.6 acres (green)
27.5 acres (blue)
* Based on monthly ET values from Allen & Brockway (1983), presented in M3 Eagle, LLC,
Second Amended Application for Water Right Permit (Feb. 2008). See Appendix H of Facility Plan for
demand calculation excerpts from the application.
**Irrigation demands for open spaces and common areas were prepared by Coates Irrigation as part of the
Irrigation Master Plan being prepared by M3. Documentation of calculations and assumptions were provided
by Coates Irrigation and are included in Appendix F.
The irrigation demands presented have been incorporated into the hydraulic simulations and
source capacity requirements included in this amendment.
Equivalent Dwelling Unit (EDU) Determination
The Facility Plan included a determination for and related all demands to EDUs. However,
this determination was based upon a maximum day indoor demand of 411 gpd/residence and
not 800 gpd/residence as used in this amendment and as required by the Rules.
Spring Valley Water Facility Plan – PUMP #1 Amendment 4-7
Given the higher demands used in this amendment, EDUs could be recalculated and
presented. However, it is believed that the EDU determinations made in the Facility Plan
provide a more realistic estimation of the relationship that will actually be experienced during
operation of the system. As such, revisions to the EDU determinations made in the Facility
Plan are not included in this amendment. These values should be re-evaluated once the
system is in operation and actual data can be used to correlate usage to an EDU.
Overall Potable Water Demands for PUMP #1
Table 4.4 summarizes the overall potable water demands for various demand scenarios.
Table 4.4: Overall Potable Water Demands for PUMP #1
Demand Scenario Demand Rate
(gpm)*
Unit Demand
(gpm/residence)
Unit Demand
(gpd/residence)
Average Day w/o Irrigation 101 0.44 630
Maximum Day w/out Irrigation
(365 day Year) 152 0.66 945
Average Day w/ Irrigation
296 1.28 1843
Maximum Day w/ Irrigation 460 1.98 2851
Peak Hour w/ Irrigation 921 3.97 N/A
* Includes Indoor and potable water irrigation demands for 232 detached residential units (190 standard lots and
42 large lots),0.7 acres of commercial, and the WWTP demands. Irrigation demands are based on irrigation of
190 standard lots, 30 large lots and 42.1 acres of common area based on build-out of PUMP #1 demand
calculations presented in M3 Eagle, LLC, Second Amended Application for Water Right Permit (Feb. 2008).
See Appendix H of Facility Plan for demand calculation excerpts from the application. See Appendix F of
amendment for demand calculations associated with open spaces.
Comparison of Potable Water Unit Demands
The average day unit demands were presented in the Facility Plan for comparison to the value
estimated for the Spring Valley development. Table 4.5 presents this same information and
compares it to the value presented in this report that includes the required 800 gpd/residence
maximum day demand. They do not include irrigation demands or fire flow. When comparing
proposed Spring Valley unit demands from Table 4.4 to unit demands in Table 4.5, it is clear that
the indoor potable water demands for Spring Valley used in this amendment are conservative as
is expected and an intended consequence of the 800 gpd/residence maximum day demand used.
Spring Valley Water Facility Plan – PUMP #1 Amendment 4-8
Table 4.5: Other Local & Western U.S. Region Communities
Community
(Approximate Distance, mile)
Average Day
Unit Demand
(gpd/unit)
Average Day
Unit Demand
(gpm/unit)
Spring Valley, ID 630 0.44
City of Star, ID (15) 300 0.21
City of Flagstaff, AZ (880) 334 0.23
Danskin Sub, Kuna, ID (30) 282 0.20
City of Prescott, AZ (1035) 448 0.31
City of Salt Lake, UT (365) 197 0.14
Maximum Value 448 0.31
Minimum Value 197 0.14
Average Value 312 0.22
Water Demands per Pressure Zone
Water demands per pressure zone for PUMP #1 are shown in Table 4.6
Table 4.6: Maximum Day Potable Water Demands per Pressure Zone
Total Maximum Day Demand* (gpm)
2800 PZ 2910 PZ TOTAL
419 41 460
* Values rounded to nearest gpm by Pressure Zone. Distribution may change in response to final
grading and development design.
Water Demands per Phase
Water demands per Phase were included in the Facility Plan. PUMP #1 represents the first phase
of the development and the demands included in this amendment replace those demands included
in the Facility Plan for phase 1.
Overall water demands presented in the Facility Plan remain the best source for anticipated build out
conditions for the entire development and the difference in demands between PUMP #1 (as presented in
this amendment) and phase 1 as presented in the Facility Plan is simply a change in phasing and does not
represent or indicate a change in overall water system planning as they relate to demands.
Idaho Administrative Code, Department of Environmental Quality
The Idaho Rules for Public Drinking Water Systems states that “The minimum capacity of eight
hundred (800) gallons per day per unit shall be the design maximum day demand rate exclusive
of irrigation and fire flow requirements.”
Experience in the area has shown that this number is usually a conservative value. Recognizing
this, the Rules also state that if the owner of the system can demonstrate that actual use records
indicate a lower value, DEQ may allow a lower maximum day demand other than eight hundred
(800) gallons per day per unit to be used for design.
The Facility Plan provided supporting documentation and calculations as a basis for a maximum
day demand of 411 gallons per day per residence and this value was used in the development of
the Facility Plan. However, the Facility Plan notes that the initial phases of the water system
Spring Valley Water Facility Plan – PUMP #1 Amendment 4-9
must be designed using the 800 gpd/residence value exclusive of irrigation and fire flow
demands. This amendment was prepared using the demand required by the Rules as documented
within.
Fire Flows
Fire flow requirements included in the Facility Plan are between 1,500 gpm for low-density
residential land use and up to 3,000 gpm for remaining land uses, both at a 3–hour duration.
PUMP #1 is exclusively low-density residential with the possible exception of the recreation
center and sales office facilities identified on Figure 5.1.
The hydraulic modeling performed as part of this amendment and presented in a subsequent
chapter of this report and Appendices B through E evaluate the ability of the distribution system
to provide fire flows at all nodes in models representative of both start-up and build-out
anticipated conditions.
The results of the modeling efforts show that with adequate well capacity the distribution system
is capable of providing the 1,500 gpm fire flow at all nodes.
M3 will work with the local fire authority and building department to comply with the applicable
codes regarding fire flows for the rec center and sales office facilities. Depending on actual well
source capacities, items including square footage, materials of construction, and the use of
sprinklers will be considered and coordinated for facilities constructed at this location. This
Facility Plan Amendment is based on providing a minimum fire flow of 1,500 gpm throughout all
of PUMP #1 during the initial phase. As subsequent portions of the project are developed,
additional well source capacity for fire flows will become available and much higher fire flows
achieved at locations throughout PUMP #1.
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Spring Valley Water Facility Plan – PUMP #1 Amendment 5-1
Section 5
Water Facility Planning
Water Facility Planning Criteria
Service and Operational Requirements
The information included in the Facility Plan was incorporated into the PUMP #1water
planning without modification with the following exceptions:
• Establishing the 2910 Pressure Zone as the primary well source receiving zone.
• Providing a method to lift water from the 2910 to the 3020 Pressure Zone. A
number of approaches can accomplish this task. This amendment presents two
conceptual approaches that will be further evaluated in the Facility Plan to be
developed in the future for PUMP #2.
• By adding a dedicated transmission main into the 2800 zone to feed the 2910 zone,
the potential exists that the maximum design pressure may exceed the 120 psi used
in the Facility Plan. Because these are dedicated lines with no services, the higher
pressure can be addressed with the use of appropriate class pipe.
Other operational and service requirements identified in the Facility Plan that are
incorporated into the planning for PUMP #1 are briefly repeated below to assist the reader of
this amendment:
• 100 psi static pressure for low elevation of pressure zones
• Minimum pressure of 20 psi maintained during fire suppression event in conjunction
with maximum day water demand
Spring Valley Water Facility Plan – PUMP #1 Amendment 5-2
• Individual PRV’s required for service connections with static pressures greater than
80 psi
• Minimum residual pressure of 40 psi maintained at building sites during peak hour
conditions
• Velocities less than 5 feet per second during peak hour or headlosses less than 10 feet
per 1,000 feet of pipe
• Hazen-Williams roughness factor of 130.
Appurtenant facilities as described in the Facility Plan will be required throughout PUMP #1
to provide both operational flexibility and proper operation and maintenance. These
appurtenances will be detailed during design as final grading and road plans are developed
and localized low and high points identified. Special attention should be given to
appurtenances that can be included in this initial phase to accommodate the initial low flow
conditions as homes are first built and occupied. Isolation valves and blow-off assemblies
may be especially important for the initial operation of the system while demands are low.
Potable Water Wells
The Facility Plan includes detailed discussions of hydrogeologic investigations and studies
conducted regarding groundwater conditions including availability, potential capacity, aquifer
identification and flow direction, and issues pertaining to the water right application and
limitations imposed by the water right. This information and analysis remains relevant to the
proposed function and siting of water wells for PUMP #1 as presented in this amendment. As
previously noted, additional information regarding well source development has been
provided separately by HLI.
The current status of the pilot borehole for Well #1 to date has provided early positive signs
of the potential to develop a well with a capacity between 1,000 to 2,000 gpm as
contemplated in the Facility Plan. When Well #1 is completed and a well completion report
is prepared, evidence of design capacity will be provided.
The demands presented in Table 4.4 in conjunction with the required fire suppression flows
represent the total well capacity that must be provided, while meeting source redundancy
requirements. Considering peak day demands with irrigation and fire flows of 1,500 gpm, the
total peak day demands with fire flow will be 1,960gpm (1,500 gpm + 460 gpm) if no
demand is being satisfied from storage. As such, the total well capacity required to serve
PUMP #1 is 1,960gpm with the largest source out of service. The current well development
approach is to drill a single well at Well Site #1 and two wells at Well Site #2 for a total of
three wells. Each well is being planned for a design capacity of at least 1,000 gpm.
Finished Water Storage
Storage is not a component of the PUMP #1 water system. The approach with PUMP #1 is to
provide sufficient well capacity to meet peak demands in addition to fire flow and irrigation
requirements as stated in this amendment. Storage requirements included in the Facility Plan
for subsequent phases and pressure zones remain valid and are not modified by this
amendment.
The changes to the overall system operation contained in this amendment, primarily the use
of the 2910 Pressure Zone as the primary source water receiving zone, make storage a critical
Spring Valley Water Facility Plan – PUMP #1 Amendment 5-3
element in the long term planning for Spring Valley. Listed below are considerations related
to storage resulting from changes included in this amendment:
• The additional need to lift water from the 2910 to the 3020 Pressure Zone could be
facilitated with storage at the transition location.
• Use of the 2910 Pressure Zone to convey large volumes of water to the higher
elevation zones presents the potential for pressure transients to develop in the
pipeline. These conditions and their potential impacts can be accounted for in the
design and operation of the system. Including storage on the 2910 Pressure Zone is
one measure that could be used to reduce the risk associated with pressure transients.
Under one of the conceptual approaches presented in this amendment to deal with the
operational changes, as presented in Figures 5.2B and 5.3B, storage is used to provide the
benefits identified above. In this instance, the overall storage requirement of 3.2 MG would
be maintained, but would be spread across three locations instead of two as shown in the
Facility Plan.
Pumping Stations
Pumping stations which pump water from a storage tank are not included in PUMP #1.
Information included in the Facility Plan regarding such pumping stations is not modified by
this amendment.
Pumping stations for the wells will be sized to utilize the design capacity of the well as
determined in the well completion reports provided after construction of the well. With
anticipated well yields of 1,000gpm, each well included in PUMP #1 is anticipated to be
equipped with a large submersible pump. Two of the wells will also be equipped with a
smaller pump sized to meet peak hour demands and operational gaps in the system. Pumps
will be equipped with VFD drives to meet the variable system demands and hydropneumatic
tanks will be incorporated to facilitate operation under very low demand conditions. Flow
control valves will also be utilized to provide additional operational flexibility to meet the
initial low flow demands as the project gets off the ground. As occupancy in the
development increases and additional PUMPs are developed, the hydropneumatic tanks may
be taken off-line to reduce pump cycling and increase system efficiency.
As previously noted, this amendment does present a conceptual approach to system operation
that would replace the three pressure reducing stations included in the Facility Plan that were
to connect the 2910 and 3020 Pressure Zones with booster stations as shown in Figures 5.2A
and 5.3A. These three booster stations would have a combined capacity to meet maximum
day demands over a 24-hour period for the 3020, 3130, and 3220 Pressure Zones, which
based on Table 4.9 from the Facility Plan is 5,761 gpm. Each of the three booster stations
would be sized to provide an approximate peak flow of 2,900 gpm. With this design criteria,
redundant pumps will not be required and redundancy can be provided by simplex pumping
systems. Back-up power will be required at each booster station site.
For the second conceptual approach to system operational changes (Figures 5.2B and 5.3B)
an additional booster pump station would be associated with the new reservoir on the 2910
Pressure Zone. This Booster station would be sized to meet the maximum day demands for
the 3020, 3130, and 3220 Pressure Zones or 5,761 gpm. Redundant pumps as well as back-
up power would be required for the station.
Spring Valley Water Facility Plan – PUMP #1 Amendment 5-4
Pressure Reducing Station
While this amendment includes the removal of three pressure reducing stations that were
originally included in the Facility Plan, the planning criteria for those stations that will remain
has not changed from those included in the Facility Plan.
The proposed pressure reducing stations will be sized to provide a range of demands required
in the pressure zone, while maintaining adequate system pressure. The stations shall
incorporate a dual pipe train, each with a pressure reducing valve. The combination of trains
and pressure reducing valves shall be sized to accommodate the average day demand through
the peak hour or maximum day plus fire flow demand, whichever is larger.
Backbone Distribution Pipelines
The Facility Plan included two steady state simulations for each pressure zone included in the
proposed development. These simulations were completed with InfoWater by MWH Soft
Inc. These simulations were used to size the backbone of the distribution system. These
simulations did not include specific parcel layouts but were instead based on service areas
and contours. Since these simulations were completed, layouts and phasing plans have
changed with additional planning efforts. With the current planning completed to date for
PUMP #1, refined simulations have been completed for the entire distribution system for
PUMP #1 based on the lot layout included in the Preliminary Plat application and preliminary
grading plans for each individual lot.
These simulations were completed using WaterCADD and include the entire planned
distribution system for PUMP #1. A total of four steady state simulations were created and
included in this amendment. Each simulation run is briefly outlined below:
• Run #1 – Peak hour demands. 40 psi minimum residual pressure required.
• Run #2 – Maximum day demands plus fire flow of 1,500 gpm. 20 psi minimum
residual required.
• Run #3 – Operation of 2910 zone at lower HGL to conserve energy during early
stages of development. Individual service PRV requirements must be based on Run
#1 and #2.
• Run #4 – Peak hour demands and the transmission of 4,000 gpm through PUMP #1
to serve the upper portions of the development.
After each steady-state model run in the iterative process, output was checked with the
operational requirements, included in the Facility Plan and in this amendment, and the pipe
diameters were adjusted. The pipe sizes and location of key features for PUMP #1 as
determined in this Facility Plan amendment through the modeling effort are presented on
Figure 5.1.
The output generated for the various simulations completed are included in Appendices B, C,
D, and E.
Spring Valley Water Facility Plan – PUMP #1 Amendment 5-5
Build-Out Water Facility Plan
As indicated in Section 2 of this amendment, the pressure zone layout presented in the Facility
Plan is amended to utilize the 2910 Pressure Zone as the source for most well sources. This
approach increases the areas that can be utilized as potential well sites and allows for more
advantageous well densities and spacing, taking advantage of the existing hydrogeologic
conditions.
The water infrastructure planned for PUMP #1 for Spring Valley is depicted on Figure 5.1. The
infrastructure is shown in plan-view and pressure zones identified.
Figures 5.2 and 5.3, both A and B, conceptually present approaches that could accommodate the
change in system operations included in this amendment. These approaches are not presented in
this amendment as final solutions or selected alternatives, but are instead intended to provide an
example of the approaches that will be considered during the development of a new Facility Plan
that will be prepared in conjunction with PUMP #2.
Figures 5.4 A and B are also included in this amendment to schematically show the likely system
components that would be associated with either alternative.
The Spring Valley development water Facility Plan has been sized to accommodate 7,153
residential units. The Facility Plan includes a bullet summary of the build-out water facilities for
the Spring Valley development. The headings of this bullet summary are repeated below with a
brief description of the additions and deletions included in this amendment:
• Pressure Zones: PUMP #1 will include portions of Pressure Zones 2800 and 2910.
• Wells: Three (3) wells with design yields of at least 1,000 gpm are anticipated for PUMP
#1. The total number of wells necessary to serve the entire development is unchanged
from what is presented in the Facility Plan.
• Storage: PUMP #1 does not include storage and the total storage requirements included
in the Facility Plan remain unchanged by this amendment. Conceptual alternative B
includes the addition of storage to the 2910 Pressure Zone, but the total storage volume
for the system remains unchanged from what is included in the Facility Plan.
• Pumping Stations: PUMP #1 does not include pumping stations from storage.
Requirements for the two (2) pumping station sites included in the Facility Plan remain
unchanged by this amendment. Conceptual alternative A discussed in this amendment
does include the addition of three booster pump stations, each with a simplex
arrangement capacity of at least 2,900 gpm and back-up power that will be required to
supply water to the upper three pressure zones from the 2910 zone. Conceptual
alternative B also includes one additional at grade booster pump station to move water
from the 2910 reservoir to the 3020 reservoir. This station would be sized for a capacity
of 5,761 gpm with pump redundancy.
• Pressure Reducing Station: The three primary pressure reducing stations included in the
Facility Plan connecting the 3020 and 2910 zones are removed by this amendment.
• Standby Power: Standby power requirements for wells and pumping stations described
in the Facility Plan remain unchanged by this amendment. The additional pump
station(s) included in conceptual alternatives A and B would require standby power.
Spring Valley Water Facility Plan – PUMP #1 Amendment 5-6
Water Facilities per Pressure Zone
With the modifications included in this amendment, the water facilities per pressure zone
presented in the Facility Plan require slight modification to accurately reflect the planning
included both in the Facility Plan and this amendment. The build out water facilities for each
pressure zone are described below and changes from the Facility Plan are identified.
Pressure Zone 2800
The Facility Plan identifies the 2800 pressure zone being hydraulically connected to the 2910
and 3020 pressure zones through a series of PRV’s with three of the units connecting the
2910 zone to the 3020 zone and a single PRV connecting the 2910 and 2800 zones.
With this amendment, the 2800 Pressure Zone will be hydraulically connected to the 2910
pressure zone through a single PRV. This connection will be established during the initial
construction of PUMP #1 improvements. The 2910 zone, however, will not be connected to
the 3020 zone with three pressure reducing stations as described in the Facility Plan. Instead
water from the 2910 zone will lifted up to the 3020 zone.
Pressure Zone 2910
Facilities identified in the Facility Plan for this zone are changed by this amendment. The
2910 zone will be served by three wells for PUMP #1 improvements with additional well
sources being added as the project develops. With the revised system arrangement included in
this amendment, the total well source capacity that will be required for the 2910 zone will be
maximum day demands plus fire flows for both the 2800 and 2910 zones plus well source
redundancy. Using Table 4.9 from the Facility Plan as a guide, a total minimum well
capacity of 2,836 gpm with the largest source out of service, plus fire flow will be required
just to meet the needs of the 2800 and 2910 zones. Additional well capacity connected to the
2910 zone will be available for export to the upper three pressure zones through a series of
booster pump stations and reservoirs.
The three pressure reducing stations included in the Facility Plan connecting the 2910 and
3020 Pressure Zones are eliminated by this amendment. Two conceptual approaches have
been presented in this amendment that will allow for water from the 2910 zone to be lifted to
the 3020 zone. Under alternative A, the PRV’s are replaced by three booster stations, each
with a capacity of 2,900 gpm to feed the 3020 zone from the 2910 zone. Under alternative B,
the PRV’s are replaced by the 2910 reservoir and a single, 5,761 gpm booster station.
Pressure Zone 3020
PUMP #1 does not include the 3020 pressure zone but the changes to the system included in
this amendment include modifications that change the overall function and improvements
associated with the 3020 Pressure Zone.
The Facility Plan identifies five 2,000 gpm wells being required to provide sufficient source
capacity for the development. The Facility Plan included all of these well sources in the 3020
zone. This amendment removes most of these wells from the 3020 zone and anticipates
many of the necessary well sources will feed directly to the 2910 Pressure Zone. At project
build-out some wells may still be connected directly to the 3020 zone depending on the well
location and overall well capacity for the project. As additional wells are developed as the
project progresses, determinations will have to be made as to which pressure zone the source
will be connected to. The answer will depend on several factors including the location of the
well source relative to the pressure zones, minimum well source capacity requirements for the
Spring Valley Water Facility Plan – PUMP #1 Amendment 5-7
2910 zone, and the relative demands in the respective zones at the time of the well source
capacity improvements.
Pressure Zone 3130
PUMP #1 does not include the 3130 pressure zone and proposed improvements for PUMP #1
do not change the improvements required for this zone as presented in the Facility Plan.
Pressure Zone 3200
PUMP #1 does not include the 3200 pressure zone and proposed improvements for PUMP #1
do not change the improvements required for this zone as presented in the Facility Plan.
Spring Valley Water Facility Plan – PUMP #1 Amendment 5-8
Phased Water Facility Plan
The phasing of the water facilities included in the Facility Plan continue to remain valid with this
amendment and continue to provide an overall phasing plan for the improvements.
This section of the amendment will focus on the early stages of operation of the PUMP #1
improvements and provide details regarding both the initial operation of the system and how
system operation can be managed in response to future phases and expansion of the system
beyond PUMP #1.
When the water system for PUMP #1 is operated as an independent system, the hydraulic grade
of the zone can be operated at a lower level and still provide adequate service to all of PUMP #1.
Modeling simulation run # 3 was completed to identify the HGL that could be used for the initial
operation of the PUMP #1 water system. Based on these simulations, an HGL of approximately
2860’ for the 2910 zone is adequate. At build out, the simulations indicate that the HGL will
have to be increased to approximately 2950’.
As part of the Facility Plan, it was identified that a number of lots would require individual
pressure reducing valves. These devices will be required at lots where the static pressure is
between 80 and 100 psi. To identify those lots within PUMP #1 that will require these devices,
model simulation #3 was not used because of the temporarily lower HGL used in this simulation.
The other model simulations were used to make this determination and those lots that will require
pressure reducing valves on their service are identified on Figure 5.1.
Section 4 of this amendment identifies the demands associated with the development of PUMP
#1. Because PUMP #1 is being constructed without a storage component, sufficient source well
capacity must be provided to meet the specified operating criteria under all required demand
conditions. As established in this report, the total instantaneous maximum demand for PUMP #1
is calculated to be 1,960gpm which is the maximum day demand plus 1,500 gpm fire flow.
Reservoir storage will be added to the overall system with the first phase of construction of
PUMP #2. This trigger for the addition of storage to the system is being made to provide the
following benefits:
• This will “free-up” 1,500 gpm of source well capacity that was previously allocated to
fire flows. With the fire flow demands addressed with storage, this 1,500 gpm of source
capacity can be used to meet potable demands and allow substantial growth of the
development while delaying the construction of additional wells.
• Address concerns expressed by the City of Eagle staff regarding operation complexity,
power consumption, and manpower requirements for operation of the system.
The fundamental change included in this amendment to use the 2910 zone as the primary well
source capacity zone requires that the improvements associated with this zone are adequate to
allow for the export of large quantities of water to the upper zones. At the current time it is not
known where within the development the required well capacity will be available. Monitoring of
aquifer responses in the initial wells constructed will be instrumental in determining the most
appropriate locations for future wells. To at least partially address this uncertainty, this
amendment attempts to size those portions of the transmission mains in the 2910 zone to provide
the ability to export water to the upper zones while maintaining the necessary pressures within the
2910 zone to provide service within this zone. Model simulation Run #4 presents one scenario in
which approximately 4000 gpm is exported through PUMP #1 to its eastern boundary. This
simulation shows that a careful balance is necessary between the HGL of the 2910 zone and head
Spring Valley Water Facility Plan – PUMP #1 Amendment 5-9
losses in those pipelines involved in the export of water from the zone. This difficulty arises in
that the overall system layout is based on a low head loss system with a nearly flat HGL across
the entire pressure zone. When the export of large quantities of water is added to the equation, it
is virtually impossible to limit pipe losses and maintain a flat HGL across the 2910 pressure zone.
While this situation presents challenges, they typically can be addressed by manipulating the
HGL in the 2910 zone. Run #4 is included as a “hypothetical” situation to show that PUMP #1
can be adequately served while exporting 4,000 gpm up gradient of PUMP #1at an HGL higher
than what is necessary to serve the 2910 zone.
Cost Analysis
An updated cost analysis was prepared for those improvements included as part of PUMP #1 and
is presented in Appendix G. The current opinion of probable construction cost for water system
improvements associated with PUMP #1 is approximately $6M.
Alternative Facility Analysis
The alternative facility analysis in the Facility Plan was used to evaluate and compare different
approaches to serving the overall development. Based on the analysis completed, Alternative #3
was selected. This amendment to the Facility Plan is based largely on this alternative, but does
include changes to the alternative described in the Facility Plan. In a sense, this amendment
includes a fourth alternative that was not previously included. This new alternative maintains the
same overall pressure zone configuration and planned boundaries included under Alternative #3
in the Facility Plan, but by changing the 2910 zone to be the primary receiving zone for well
source capacity and providing the flexibility to increase the areas for potential well sites, this
fourth alternative provides several benefits for the development.
Declining Balance Report
A declining balance report will be prepared and submitted for PUMP #1 to be included in
Appendix I of the Facility Plan after the construction of the system, including sufficient well
sources to meet the included demands as described in this amendment.
Spring Valley Water Facility Plan – PUMP #1 Amendment F-1
Appendix F
Irrigation of Common Areas and Open Spaces from
Potable System Demands and Assumptions
(from Coates Irrigation)
SPRING VALLEY--PUMP 1 INITIAL DEMAND
Irrigation Water Use Projections
TOTAL ANNUAL WATER USE AND PEAK FLOW TURF SHRUBS/TREES
7 DAYS 7 DAYS
Prepared by Coates Irrigation Consultants, Inc.9.0 HOURS 9.0 HOURS
ESTIMATED IRRIGATION WATER USE
Area Description Total Area Irrigated
(Acre)
Total Annual
Req. (Ac. Ft.)
Peak Season Flow
(GPM)Peak Daily Gallons
SWA-1
TURF--SWA-1 1 4.08 20 9,124
DRIP--SWA-1 10 10.72 52 23,950
TOTAL 11.00 14.80 72 33,074
SWA-2
TURF--SWA-2 0.5 2.04 10 4,562
DRIP--SWA-2 2 2.14 10 4,790
TOTAL 2.50 4.19 20 9,352
SWA-4 (1/2)
TURF--SWA-4 (1/2)0.5 2.04 10 4,562
DRIP--SWA-4 (1/2)1.5 1.61 8 3,592
TOTAL 2.00 3.65 18 8,154
POLLARD (1/3)
TURF--POLLARD (1/3)6 24.50 119 54,742
DRIP--POLLARD (1/3)6 6.43 31 14,370
TOTAL 12.00 30.93 150 69,112
GRAND TOTAL 27.50 53.56 260 119,692
March 18, 2014
WATERING WINDOW
SPRING VALLEY PUMP 1 INITIAL DEMAND ESTIMATED IRRIGATION WATER USE
MONTHLY REFERENCE DATA
TURF--POLLARD (1/3)
IRRIGATED
ACRES MONTH HIST. ET PLANT
COEFNT.
PLANT
WATER
REQ.
TOTAL
WATER REQ.
(IN.)
WEEKLY
WATER
REQ. (IN.)
MONTHLY
WATER REQ.
(GAL.)
MONTHLY
WATER REQ.
(Ac Ft.)
PEAK
FLOW
(GPM.)
6 Jan 0 1.00 0 80%1.2 0.0000 0.00 0 0.00 0
6 Feb 0 1.00 0 80%1.2 0.0000 0.00 0 0.00 0
6 Mar 1.28 1.00 1.28 80%1.2 1.5360 0.36 250,251 0.77 18
6 Apr 3.96 1.00 3.96 80%1.2 4.7520 1.11 774,215 2.38 54
6 May 5.95 1.00 5.95 80%1.2 7.1400 1.66 1,163,277 3.57 81
6 Jun 7.39 1.00 7.39 80%1.2 8.8680 2.06 1,444,810 4.43 101
6 Jul 8.68 1.00 8.68 80%1.2 10.4160 2.42 1,697,016 5.21 119
6 Aug 7 1.00 7 80%1.2 8.4000 1.95 1,368,562 4.20 96
6 Sep 4.29 1.00 4.29 80%1.2 5.1480 1.20 838,733 2.57 59
6 Oct 2.28 1.00 2.28 80%1.2 2.7360 0.64 445,760 1.37 31
6 Nov 0 1.00 0 80%1.2 0.0000 0.00 0 0.00 0
6 Dec 0 1.00 0 80%1.2 0.0000 0.00 0 0.00 0
TOTALS 40.83 7,982,624 24.50 119
DRIP--POLLARD (1/3)
IRRIGATED
ACRES MONTH HIST. ET PLANT
COEFNT.
PLANT
WATER
REQ.
TOTAL
WATER REQ.
(IN.)
WEEKLY
WATER
REQ. (IN.)
MONTHLY
WATER REQ.
(GAL.)
MONTHLY
WATER REQ.
(Ac Ft.)
PEAK
FLOW
(GPM.)
6 Jan 0 0.30 0 95%1.05 0.00 0.00 0 0.00 Streetsc
6 Feb 0 0.30 0 95%1.05 0.00 0.00 0 0.00 0
6 Mar 1.28 0.30 0.384 95%1.05 0.40 0.09 65,691 0.20 5
6 Apr 3.96 0.30 1.188 95%1.05 1.25 0.29 203,231 0.62 14
6 May 5.95 0.30 1.785 95%1.05 1.87 0.44 305,360 0.94 21
6 Jun 7.39 0.30 2.217 95%1.05 2.33 0.54 379,263 1.16 27
6 Jul 8.68 0.30 2.604 95%1.05 2.73 0.64 445,467 1.37 31
6 Aug 7 0.30 2.1 95%1.05 2.21 0.51 359,247 1.10 25
6 Sep 4.29 0.30 1.287 95%1.05 1.35 0.31 220,167 0.68 15
6 Oct 2.28 0.30 0.684 95%1.05 0.72 0.17 117,012 0.36 8
6 Nov 0 0.30 0 95%1.05 0.00 0.00 0 0.00 0
6 Dec 0 0.30 0 95%1.05 0.00 0.00 0 0.00 0
TOTALS 40.83 2,095,439 6.43 31
Prepared by Coates Irrigation Consultants, Inc.
This table uses acreage information supplied by Greey-Pickett on 3-18-14.
0
AG
SYSTEM
EFFICIENCY (%)
SYSTEM
EFFICIENCY (%)
SPRING VALLEY PUMP 1 INITIAL DEMAND ESTIMATED IRRIGATION WATER USE
MONTHLY REFERENCE DATA
TURF--SWA-1
IRRIGATED
ACRES MONTH HIST. ET PLANT
COEFNT.
PLANT
WATER
REQ.
TOTAL
WATER REQ.
(IN.)
WEEKLY
WATER
REQ. (IN.)
MONTHLY
WATER REQ.
(GAL.)
MONTHLY
WATER REQ.
(Ac Ft.)
PEAK
FLOW
(GPM.)
1 Jan 0 1.00 0 80%1.2 0.0000 0.00 0 0.00 0
1 Feb 0 1.00 0 80%1.2 0.0000 0.00 0 0.00 0
1 Mar 1.28 1.00 1.28 80%1.2 1.5360 0.36 41,709 0.13 3
1 Apr 3.96 1.00 3.96 80%1.2 4.7520 1.11 129,036 0.40 9
1 May 5.95 1.00 5.95 80%1.2 7.1400 1.66 193,880 0.59 14
1 Jun 7.39 1.00 7.39 80%1.2 8.8680 2.06 240,802 0.74 17
1 Jul 8.68 1.00 8.68 80%1.2 10.4160 2.42 282,836 0.87 20
1 Aug 7 1.00 7 80%1.2 8.4000 1.95 228,094 0.70 16
1 Sep 4.29 1.00 4.29 80%1.2 5.1480 1.20 139,789 0.43 10
1 Oct 2.28 1.00 2.28 80%1.2 2.7360 0.64 74,293 0.23 5
1 Nov 0 1.00 0 80%1.2 0.0000 0.00 0 0.00 0
1 Dec 0 1.00 0 80%1.2 0.0000 0.00 0 0.00 0
TOTALS 40.83 1,330,437 4.08 20
DRIP--SWA-1
IRRIGATED
ACRES MONTH HIST. ET PLANT
COEFNT.
PLANT
WATER
REQ.
TOTAL
WATER REQ.
(IN.)
WEEKLY
WATER
REQ. (IN.)
MONTHLY
WATER REQ.
(GAL.)
MONTHLY
WATER REQ.
(Ac Ft.)
PEAK
FLOW
(GPM.)
10 Jan 0 0.30 0 95%1.05 0.00 0.00 0 0.00 Streetsc
10 Feb 0 0.30 0 95%1.05 0.00 0.00 0 0.00 0
10 Mar 1.28 0.30 0.384 95%1.05 0.40 0.09 109,485 0.34 8
10 Apr 3.96 0.30 1.188 95%1.05 1.25 0.29 338,719 1.04 24
10 May 5.95 0.30 1.785 95%1.05 1.87 0.44 508,934 1.56 36
10 Jun 7.39 0.30 2.217 95%1.05 2.33 0.54 632,104 1.94 44
10 Jul 8.68 0.30 2.604 95%1.05 2.73 0.64 742,445 2.28 52
10 Aug 7 0.30 2.1 95%1.05 2.21 0.51 598,746 1.84 42
10 Sep 4.29 0.30 1.287 95%1.05 1.35 0.31 366,946 1.13 26
10 Oct 2.28 0.30 0.684 95%1.05 0.72 0.17 195,020 0.60 14
10 Nov 0 0.30 0 95%1.05 0.00 0.00 0 0.00 0
10 Dec 0 0.30 0 95%1.05 0.00 0.00 0 0.00 0
TOTALS 40.83 3,492,398 10.72 52
Prepared by Coates Irrigation Consultants, Inc.
This table uses acreage information supplied by Greey-Pickett on 3-18-14.
0
AG
SYSTEM
EFFICIENCY (%)
SYSTEM
EFFICIENCY (%)
SPRING VALLEY PUMP 1 INITIAL DEMAND ESTIMATED IRRIGATION WATER USE
MONTHLY REFERENCE DATA
TURF--SWA-2
IRRIGATED
ACRES MONTH HIST. ET PLANT
COEFNT.
PLANT
WATER
REQ.
TOTAL
WATER REQ.
(IN.)
WEEKLY
WATER
REQ. (IN.)
MONTHLY
WATER REQ.
(GAL.)
MONTHLY
WATER REQ.
(Ac Ft.)
PEAK
FLOW
(GPM.)
0.5 Jan 0 1.00 0 80%1.2 0.0000 0.00 0 0.00 0
0.5 Feb 0 1.00 0 80%1.2 0.0000 0.00 0 0.00 0
0.5 Mar 1.28 1.00 1.28 80%1.2 1.5360 0.36 20,854 0.06 1
0.5 Apr 3.96 1.00 3.96 80%1.2 4.7520 1.11 64,518 0.20 5
0.5 May 5.95 1.00 5.95 80%1.2 7.1400 1.66 96,940 0.30 7
0.5 Jun 7.39 1.00 7.39 80%1.2 8.8680 2.06 120,401 0.37 8
0.5 Jul 8.68 1.00 8.68 80%1.2 10.4160 2.42 141,418 0.43 10
0.5 Aug 7 1.00 7 80%1.2 8.4000 1.95 114,047 0.35 8
0.5 Sep 4.29 1.00 4.29 80%1.2 5.1480 1.20 69,894 0.21 5
0.5 Oct 2.28 1.00 2.28 80%1.2 2.7360 0.64 37,147 0.11 3
0.5 Nov 0 1.00 0 80%1.2 0.0000 0.00 0 0.00 0
0.5 Dec 0 1.00 0 80%1.2 0.0000 0.00 0 0.00 0
TOTALS 40.83 665,219 2.04 10
DRIP--SWA-2
IRRIGATED
ACRES MONTH HIST. ET PLANT
COEFNT.
PLANT
WATER
REQ.
TOTAL
WATER REQ.
(IN.)
WEEKLY
WATER
REQ. (IN.)
MONTHLY
WATER REQ.
(GAL.)
MONTHLY
WATER REQ.
(Ac Ft.)
PEAK
FLOW
(GPM.)
2 Jan 0 0.30 0 95%1.05 0.00 0.00 0 0.00 Streetsc
2 Feb 0 0.30 0 95%1.05 0.00 0.00 0 0.00 0
2 Mar 1.28 0.30 0.384 95%1.05 0.40 0.09 21,897 0.07 2
2 Apr 3.96 0.30 1.188 95%1.05 1.25 0.29 67,744 0.21 5
2 May 5.95 0.30 1.785 95%1.05 1.87 0.44 101,787 0.31 7
2 Jun 7.39 0.30 2.217 95%1.05 2.33 0.54 126,421 0.39 9
2 Jul 8.68 0.30 2.604 95%1.05 2.73 0.64 148,489 0.46 10
2 Aug 7 0.30 2.1 95%1.05 2.21 0.51 119,749 0.37 8
2 Sep 4.29 0.30 1.287 95%1.05 1.35 0.31 73,389 0.23 5
2 Oct 2.28 0.30 0.684 95%1.05 0.72 0.17 39,004 0.12 3
2 Nov 0 0.30 0 95%1.05 0.00 0.00 0 0.00 0
2 Dec 0 0.30 0 95%1.05 0.00 0.00 0 0.00 0
TOTALS 40.83 698,480 2.14 10
Prepared by Coates Irrigation Consultants, Inc.
This table uses acreage information supplied by Greey-Pickett on 3-18-14.
0
AG
SYSTEM
EFFICIENCY (%)
SYSTEM
EFFICIENCY (%)
SPRING VALLEY PUMP 1 INITIAL DEMAND ESTIMATED IRRIGATION WATER USE
MONTHLY REFERENCE DATA
TURF--SWA-4 (1/2)
IRRIGATED
ACRES MONTH HIST. ET PLANT
COEFNT.
PLANT
WATER
REQ.
TOTAL
WATER REQ.
(IN.)
WEEKLY
WATER
REQ. (IN.)
MONTHLY
WATER REQ.
(GAL.)
MONTHLY
WATER REQ.
(Ac Ft.)
PEAK
FLOW
(GPM.)
0.5 Jan 0 1.00 0 80%1.2 0.0000 0.00 0 0.00 0
0.5 Feb 0 1.00 0 80%1.2 0.0000 0.00 0 0.00 0
0.5 Mar 1.28 1.00 1.28 80%1.2 1.5360 0.36 20,854 0.06 1
0.5 Apr 3.96 1.00 3.96 80%1.2 4.7520 1.11 64,518 0.20 5
0.5 May 5.95 1.00 5.95 80%1.2 7.1400 1.66 96,940 0.30 7
0.5 Jun 7.39 1.00 7.39 80%1.2 8.8680 2.06 120,401 0.37 8
0.5 Jul 8.68 1.00 8.68 80%1.2 10.4160 2.42 141,418 0.43 10
0.5 Aug 7 1.00 7 80%1.2 8.4000 1.95 114,047 0.35 8
0.5 Sep 4.29 1.00 4.29 80%1.2 5.1480 1.20 69,894 0.21 5
0.5 Oct 2.28 1.00 2.28 80%1.2 2.7360 0.64 37,147 0.11 3
0.5 Nov 0 1.00 0 80%1.2 0.0000 0.00 0 0.00 0
0.5 Dec 0 1.00 0 80%1.2 0.0000 0.00 0 0.00 0
TOTALS 40.83 665,219 2.04 10
DRIP--SWA-4 (1/2)
IRRIGATED
ACRES MONTH HIST. ET PLANT
COEFNT.
PLANT
WATER
REQ.
TOTAL
WATER REQ.
(IN.)
WEEKLY
WATER
REQ. (IN.)
MONTHLY
WATER REQ.
(GAL.)
MONTHLY
WATER REQ.
(Ac Ft.)
PEAK
FLOW
(GPM.)
1.5 Jan 0 0.30 0 95%1.05 0.00 0.00 0 0.00 Streetsc
1.5 Feb 0 0.30 0 95%1.05 0.00 0.00 0 0.00 0
1.5 Mar 1.28 0.30 0.384 95%1.05 0.40 0.09 16,423 0.05 1
1.5 Apr 3.96 0.30 1.188 95%1.05 1.25 0.29 50,808 0.16 4
1.5 May 5.95 0.30 1.785 95%1.05 1.87 0.44 76,340 0.23 5
1.5 Jun 7.39 0.30 2.217 95%1.05 2.33 0.54 94,816 0.29 7
1.5 Jul 8.68 0.30 2.604 95%1.05 2.73 0.64 111,367 0.34 8
1.5 Aug 7 0.30 2.1 95%1.05 2.21 0.51 89,812 0.28 6
1.5 Sep 4.29 0.30 1.287 95%1.05 1.35 0.31 55,042 0.17 4
1.5 Oct 2.28 0.30 0.684 95%1.05 0.72 0.17 29,253 0.09 2
1.5 Nov 0 0.30 0 95%1.05 0.00 0.00 0 0.00 0
1.5 Dec 0 0.30 0 95%1.05 0.00 0.00 0 0.00 0
TOTALS 40.83 523,860 1.61 8
Prepared by Coates Irrigation Consultants, Inc.
This table uses acreage information supplied by Greey-Pickett on 3-18-14.
0
AG
SYSTEM
EFFICIENCY (%)
SYSTEM
EFFICIENCY (%)