HomeMy WebLinkAboutRES 2008-29 - Board t
TRUCKEE , r
I L v PUblic Utility Distri'c(-
Resolution No. 2008- 29
Adoption of a Revised Water Supply Assessment
for the Truckee Railyard Master Plan project
WHEREAS, Truckee Development Associates is proposing to construct a project entitled the
"Truckee Railyard Master Plan" in the eastern portion of downtown Truckee; and
WHEREAS, the Town of Truckee has determined that preparation of a Water Supply
Assessment is required as described in the California Water Code Section 10910; and
WHEREAS, the Truckee Donner Public Utility District is the public water system that will
provide water service to the project; and
WHEREAS, the Town of Truckee as requested that the Truckee Donner Public Utility District
prepare a Water Supply Assessment for the "Truckee Railyard Master Plan" project; and
WHEREAS, the Truckee Donner Public Utility District adopted a Water Supply Assessment for
the "Truckee Railyard Master Plan" project on May 21, 2008; and
WHEREAS, additional engineering studies have been performed since adoption of the Water
Supply Assessment; and
WHEREAS, the Truckee Donner Public Utility District's Water Department has prepared a
Revised Water Supply Assessment for the "Truckee Railyard Master Plan" project:
NOW THEREFORE BE IT RESOLVED by the Board of Directors of the District as follows:
The Truckee Donner Public Utility District hereby adopts the Revised Water Supply
Assessment for the Truckee Railyard Master Plan project.
PASSED AND ADOPTED by the Board of Directors at a meeting duly called and held within
the District on the third of September 2008 by the following roll call vote:
AYES: Directors Aguera, Hemig and Taylor
NOES: Director Thomason
ABSENT: Director Sutton
TRUCKEE DONNER PUBLIC UTILITY DISTRICT
Tim Taylor, President
ATTEST:
Michael D. Holley, District Clerk
V- ____ I �,JA
DONNER
fI PublDistrict
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TRUCKEE RAILYARD MASTER PLAN
WATER SUPPLY ASSESSMENT
REVISED
September 3, 2008
THIS DOCUMENT SUPERSEDES THE WATER SUPPLY
ASSESSMENT ADOPTED ON MAY 21,2008
INTRODUCTION
This Water Supply Assessment(WSA)has been prepared by Truckee Donner Public Utca
District(District)for the Railyard Masts Plan project at the request of the Town of Truckee
This WSA is intended to satisfy the requirements of California Water Code Sections 10910
through 10914 and to provide factual information regarding the ability of the District's water
supplies to meet the water demands associated with the proposed project
BACKGROUND
The Railyard Master Plan involves redevelopment of partially developed property located along
the eastern end of downtown Truckee. The general location of the project is shown in Figure I
The project consists of
• A 60 room hotel
• A 1,000 seat movie theater
70,0W square feet of retail space
• 545 residential units in some form ofmulti-fancily,condolattached housing.
• 25 single family residential units
• 15.000 square feet of office space
• A 20,000 square feet grocery stone
• 25,000 square feet of civic use space
PROJECT WATER DEMAND
The District's 1004 Water:Nasser Plan identified the project site as a location for future
development. Detailed plans had not been prepared for the site at that time. An average day
water demand of 136,160 gallons per day(gpd)was projected based upon 34.04 acres at 4,0(N)
gallons per acre per day. That projected demand was then incorporated into the District's 2005
Urban Water Management Plan(U W MP).
Bused upon current information,an average day demand of 362.640 gpd is no%erpectcd A
breakdown of this amount is given in ruble 1.
Table 1. Projected Rail and Water Demand
Type Quantity I Unit Demand Total
Hotel 60 234 gals room 14.040
Movie Theater 1,000 3 galsr seat 3.000
Commercial 105.000 0.4 galsrSF 42,000
Multi-Family Residential 545 455 gals/unit 247.975
Single Family Residential 25 505 gals/unit 12,625
Civic Use 25.000 0.4 gals=SF 10,000
Other Uses t3 tNal
Total 362,640
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APPENDIX A
Section 5 of the 2005 Urban Water Management Plan
SECTION 5
WATER SUPPLY SOURCES
Law
I0630. It is the intention of the Legislature,in enacting this pan,to permit levels of water management
planning commamsumtc with the nmniter of eu t rnem served and the volume of water suppbed.
10631. A plan shall he adopted in accordance with this chapter and shall do all of the following:
10631.(b) Identify and quantify,to the extent practicable,the existing and planned sources of water asmlable tothe supplier over the some five-year increments Ito 10 years or as Was data is available.1
This section provides an evaluation of the available water supplies to meet the existing and
future water demands through buildoul of the District's service area. Recommendations
necessary for the District to continue providing adequate water at acceptable quality are made for
both existing and future conditions.
MARTIS VALLEY GROUNDWATER BASIN
The District's currently obtains the majority of its drinking water through the pumping of
groundwater from the Martis Valley Groundwater Basin(MVGB). The MVGB is a multiple
aquifer system consisting of basin-fill sedimentary units and interlayered basin-fill volcanic
units. Detailed information regarding geology of the MVGB can be found in a number of
sources,including:
• Availability of Ground Water. Prepared for the Truckee Donner Public Utility District by
Hydro-Search Inc. Reno,Nevada.February 1973.
• Truckee and Vicinity Ground-Water Resource Evaluation. Prepared for Dan Resorts Inc.
by Hydro-Search Inc. Reno,Nevada.April 1980.
is Ground-Water Management Plan,Phase 1,Manis Valley Ground-Water Basin,Basin
No.6-67.Nevada and Placer Counties. Prepared for the Truckee Donner Public Utility
District by Hydro-Search Inc. Reno.Nevada.January 1995
• Ground Water Resource Evaluation. Prepared For fhe Truckee Donner Public(,tility
District by Nimbus Engineers. Reno,Nevada. November 2000.
• Ground Water Availability In The Manis Valley Ground Water Basin.Nevada and Placer
Counties.California. Prepared for the Truckee Donner Public Utility District,Placer
County Water Agency and Northstar Community Services District by Nimbus Engineers.
Reno,Nevada. March 2001.
• Supplemental Report to California's Groundwater Bulletin 118,('plate 2003 Prepared
by the California Department of Water Resources.Sacramento California. Octuhcr
21M)3.
QUANTITY OF GROUNDWATER IN THE?IARTIS VALLEY BASIN
A number of studies have been conducted over the past 30 years to in,estigate and quantify the
amount of water as actable in the>I VGB. As knowledge regarding the geologic characteristics of
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Local water resources arc adequate to meet projected buildout conditions. lit. `-e, the
importation of water from other areas, water transfers and water exchanges have n�, m
investigated since they are unnecessary. Similarly,the use of desalinated water has not been
investigated,considering that the Truckee area is about 2W miles from the ocean,the use of
desalination is considered extremely unpractical.
EXISTING PRODUCTION CAPACITY IN RELATION TO PROJECTED DEMANDS
Current maximum day potable water demand is 12.61 mild. It is anticipated that this maximum
day demand will increase to 15.9 mgd and 21.38 mgd by the years 2010 and 2020,respectively.
Average day water demand will increase from 6.64 mgd currently to 8.28 mgd in the year 2010
and 11.14 mgd in the year 2020. The anticipated growth in potable water demand is presented in
Table 5-1 and is also shown graphically in Figure 5-2.
The District currently operates twelve potable water wells in the Truckee area and one in the
Hirschdafe area. The total capacity of these wells is about 9,550 gpm. As shown in Table 5-1,
the overall system production capacity is adequate for 2005,even with removal of the Donner
Lake Intake and Orcnpoint Springs from potable water service. However,adequate capacity
does not exist to serve projected demands in 2006 with a projected maximum day demand of
13.7 mgd compared with a production capacity of 13.3 mgd. Currently,there is insufficient firm
capacity,since a failure of Airport Well would lease a production capacity ofonly 10.4 mgd.
IMPACT OF UPCOMING WATER QUALITY REGULATIONS
The Environmental Protection Agency(EPA)has promulgated new regulations regarding arsenic
in drinking water supplies. New regulations regarding radon levels in drinking water are
anticipated in the near future. Both of these constituents are present in the existing wells at
levels below the existing maximums.
Arsenic Regulations
The new arsenic regulations set a maximum level of 10 mg/L and will become effective on
January 1,2006. Table 5-2 gives a summary of the arsenic levels in the existing wells based on
the most recent test results. As shown by the data.the Hirschdale and Northside Wells sill
exceed the proposed arsenic limit. I•Ao methods have bsen identified iu bring these sources into
compliance with the proposed arsenic level.
One method involves the installation of arsenic treatment systems at the affected wells. These
systems utilize either a coagulationtfiltration or ion exchange process. Both processes are quite
expensive with capital costs estimated at over S600 per Spin of wdl capacity. Operations and
maintenance is also quite costly,estimated at 50.10 per thousand gallons produced.
The second method i•.<nown as"Avoidance." A given well would be removed from service
temporarily for testing. The testing will involve isolating a section of the aquifer by scaling off
the casing above and below this level. 11-ater quahty samples would then he taken from this
section and tested for arsenic. This process would he repeated for all water beanng strata within
the aquifer. Once the formations containing high levels of arscmic have been identified,the well
casing would be scaled through these formations to prevent the entrance of water containing high
levels of arsenic.
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Table 5-2.Groundwater Well Arsenic and Radon Levels
_ Name _ Arsenic Level.Radon Level.OCi/
AL
Wall Nol Ikteetablc 540
Airport 10 1,600
` Glenshire(hive 10 765
Hirschdale 26 570
l Mattis Valley Well No.1 9.8 Data Not Available
Nonhside 38 990
Prosser Annex Not Detectable 740
Prosser Heights Not Detectable Not Detectable
Prosser Village 7 560
Sanders 4 1050
Southside No.2 Not Detectable 885
Well No.20 1 Not Detectable 1 293
Arsenic data take.from Trucker iraa.•r Sprtem 2003 Niter Qualiry Reporr
Radon data taken from testing performed in No ember 1999
During the Summer of 2005,the District will be conducting pilot plant studies to determine the
feasibility and cost associated with arsenic removal at the Nonhside Well. If treatment proves
cost effective,the District will be able to utilize the 810 gpm capacity into the future. If an
Avoidance methodology is necessary,it is expected that the capacity of Nonhside Well will be
reduced to 500 gpm.
The 26 mg/L level for the Hirschdale Well given in Table 5.2 was determined from samples
taken at the wellhead. The Hirschdale Well is equipped with a pressure filter system for iron and
manganese removal. Currently,finished water served to customers in the Hirschdale area has an
arsenic level of 22 mg/L. During 2005,the District will be conducting pilot studies to determine
if the existing treatment process can be modified to remove arsenic. The District has also
initialed discussions with the party that owns the parcel of land between the Hirschdale water
system and the Glenshire subdivision. The purpose of these discussions is to obtain an easement
for a pipeline that would connect the two water systems and provide the Hirschdale area with a
new water supply without the need for treatment.
Radon Regulations
Preliminary announcements from USEPA have indicated that the maximum allowable radon
level will likely be reduced from 4,000 picocuries per liter(pCi/L)to 300 pCi/L. Table 5-2 also
gives a summary of the radon level in the existing wells based on the most recent test results.As
shown by the data,all of the wells will exceed the proposed radon limit.The proposed radon
level limit is under review and may be set a level higher than 300 pCi/L. Two methods have
been identified to address the proposed reduction in the allowable radon level.
One method involves the removal of radon in the water by aeration.Treatment by aeration would
require the installation of separate aeration tanks and booster pumping stations at each well site.
This method would require a significant capital investment, along with incurring higher
operations and maintenance costs.Capital costs range from S 100,000 to$150,000 for each well
site.Operation and maintenance costs are estimated at$0.05 per thousand gallons.
Page 5.9
—_._._—__.____.___—_—___. Seam.s Water suppty.Smoces
The second method is a Multimedia Mitigation Program proposed by EPA.The *;media
Mitigation Program addresses both water and air quality at the point of use.This program a
limited involvement by the water provider and is focused mainly on air quality. No cos:
estimates are available at this time,but it is anticipated that the Multimedia Mitigation Program
costs will be substantially lower than the cost of treatment by aeration.Therefore,it is expected
that the forthcoming radon regulations will have a minimal impact on the District's water supply.
A vuilable Water Production Capacity Considering Water Quality Regulations
As noted above,the District will be removing the Donner Lake Intake and Greenpoint Springs
from potable water service during the Summer of 2005. The capacity of Nonhside Well may
also he reduced due the new arsenic regulations. Table 5-3 gives the anticipated water
production capacity utilizing existing facilities after considering the impact of both the upcoming
arsenic and radon regulations.
Table 5-3. Available Water Production apacity Considering Water Q fity Regulations
Name Year 2004 Total Year 2004 Firm Year 2006 Total Year 2006 Firm
_ capacity.gain capacity. m Capacity,glints Ca acih',coin
A Well 150 ISo 150 150
Anport 2,000 0 2,000 0
Donner Lake,Intake 1,400 1.400 0' 0'
Olenshire Drive 1,800 1.800 1,800 1,800
Greenpoint Spnngs [()a 10n 0' u'
Manis valley Well No.1 1.725 1,725 1.725 1.725
Nonhside 810 sin Snob Soob
Prosser Annex 400 400 400 400
Prosser Heights 350 350 350 330
Prosser Village 1,200 1.200 I.200 1.200
Sanders 301) 300 300 300
Southside No.2 225 225 225 1 225
well No.20' 560 560 560 560
total.gpm 11,020 9 020 9_s 10 7.210
1 oml.md 15.9 13.o 13.3 10.4
Note The IIirsehelalc well is mnnad come n is pan of m mdependem sy:nm and caimm he,•used to scree
demand.in the I'aiekee Sy.,at
' Surface water source to he removed from service during 2005
b Assumed capacity reduction using the••Asotdancc-Method
ADDITIONAL WATER PRODUCTION CAPACITY
The currently available production capacity will be unable to meet projected maximum day
demands in the year 2006. With the projected Buildout maximum day demand of 25.46 mgd,an
additional 15.2 mgd of production capacity is needed to meet buildout demands and to provide
adequate firm capacity to the system.
Based on the 13.3 mgd of total available capacity,an additional 12.2 mgd of production capacty
is needed over the next 22 years to meet projected demands. Funhennore,an additional 2.9 mgd
of capacity will be necessary to ensure that the system has adequate firm capacity. There are
three alternatives available to the District for additional water supply to meet this need:
Page 5.9 .---
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Se".' t water Supply Sources
In 2002 and 2003.the District drilled a number of exploration wells in order to idemu ' -ations
for future groundwater wells. Exploratory wells were drilled at the locations given in Fig,. S-
4. As a result of this exploration well program,the District acquired four well sites. The Prosser
Village Well was constructed in 2004. In 20f/5,the District will begin construction of the
Featherstone Well with the goal of having the well available for use in 2006. Property rights to
two other sites(Fibreboard&Prosser Dam Road)have been secured by the District and will be
used to construct new wills in 2007 and 2009. The District has also identified other potential
wells sites and will be drilling additional test wells once property rights can be secured.
It should also be noted that some of the existing wells may be reaching the end of their useful
lives towards the year 2025. Production from the wells should be monitored over time and
redevelopment of existing wells may be necessary to maintain an adequate water supply. Of
particular concern is the long-term viability of the existing Airport Well. The existing wellhole
and casing are not completely vertical and there is a significant offset in the casing. As a result
of this offset,the well shaft experiences accelerated wear and it is expected that the well pump
will need replacement every four years.
The use of surface water,either through a treatment plant or wells with filtration,requires that a
number of legal and environmental issues be investigated and addressed. Surface water should
be considered a long-term water supply option and may prove to be more cost-efectise than new
wells as demand approaches buildout conditions. It is recommended that the use of surface
water be investigated further towards the goals of potentially supplying new demand in the
period of 2010 and beyond.
— .. ---Page c.li ----"— ------
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L otherwise permanently reserved,for open-space use and thus future water demand on the
rl parcels is eliminated.
Result
The attached spreadsheet presents the results of the investigation.Each parcel has been
identified by the Map Identification Number and original APN contained in the W MP and
U W MP,the owner/project name and a comparison made of the average daily and yearly
demands estimated by the plans vs.demands based on the permitted land uses.Water
demand increased on six of the parcels and decreased on the remaining 33 with an overall
net decrease of 558 acre-feet(1,859-1,301)as compared to the analysis contained in the
2004 WMP.As mentioned,an analysis by the TDPUD staff estimates an annual demand of
406 acre-feet for the Truckee Railyard Master Plan Project as compared to the 152 acre-feet
projected in the adopted Plans.The 254 acre-feet shortfall(406—152)is approximately 45%
of the 558 acre-feet of water no longer required to meet the estimated demands of the 39
parcels that have been entitled and the four that are no longer developable since the original
analysis was completed in 2004,Furthermore the Truckee Railyard Project can be fully
served within the 14,619 acre feet of confirmed water supply.
I trust this letter and the enclosed spreadsheet provide the information requested by the
TDPUD Board and Staff and the Board will consider the adoption of a Water Supply
Assessment for the Truckee Railyard Master Plan Project for the entire projected water use
of 406 acre-feet.Thank you and staff for your cooperation and assistance with this review
and please do not hesitate to contact me if you have questions concerning this report.
Sincerely,
Bill Quesnel PE
Principal Engineer
Enclosure:Updated Land Use Analysis and Water Demand
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