HomeMy WebLinkAboutAgenda Report - July 16, 2008 E-14AGENDA ITEM Lre 14
A& CITY OF LODI
COUNCIL COMMUNICATION
1"4
AGENDA TITLE: Receive Surface Water Treatment Facility Conceptual Design and Feasibility
Evaluation Report
MEETING DATE: July 16,2008
PREPARED BY: Public Works Director
RECOMMENDEDACTION: Receive Surface Water Treatment Facility Conceptual Design and
Feasibility Evaluation Report.
BACKGROUND INFORMATION: On June 21, 2006, City Council voted to employ direct use of the
City's Woodbridge Irrigation District (WID) annual 6,000 acre-feet
contractual allotment. Direct use involves the treatment, disinfection
and distribution of water through the City's water distribution system.
Subsequently, a professional services contract was awarded to HDR, Inc,, of Folsom, to prepare the
Surface Water Treatment Facility Conceptual Design and Feasibility Evaluation.
Since June 2006, the Council has been led step by step through the Conceptual Design development
process. This was reviewed with Council at the July 1, 2008 Shirtsleeve Meeting. A review of these
steps is provided below.
1. Optional sites were considered. The 13 acres west of Lodi Lake (Site A) was selected by the
City Council as the preferred site because it is City owned, has the lowest site development costs,
has few permit limitations, and affords parkleducational benefits.
2. Membrane filter system was selected as the treatment process for the water plant because
membranes provide a positive barrierto pathogens, increased flexibility to meet future
regulations, smaller and more easily expanded footprint, and greater opportunities for automation.
3. Council approved the funding for construction of the raw water supply turnout at the new
Woodbridge Irrigation Districtfish screen.
The Surface Water Treatment Plant Conceptual Design and Feasibility Evaluation Report (AttachmentA)
presents a summary of thirteen Technical Memoranda that are on file in the Public Works Department. A
variety of subjects are addressed including environmental, site selection, treatment process design, water
blending chemistry, modificationsto existing facilities, capital costs, and operations and maintenance
costs.
The final cost of this study is expected to be considerably lower than anticipated (approximately $75,000)
because the contract scope of services dealing with life cycle cost comparisons, project phasing and
financing options was purposely limited. The reasons for limiting the scope are attributable to the slow
housing market.
Although the tendency at this stage of the planning process is to focus upon the conceptual cost of the
project ($41 million), the greater value of this study is to expose constraints, fatal flaws and opportunities
that can be identified for future consideration as the project planning matures. Some of the significant
aspects of this report are described below.
APPROVED: ,/229±:,
Blair Ki , 'ty Manager
K IWPIPROJECTSIWATER1SurfaceWaterPlant\CCSurFace Water Treatment FadfltyD _ easiblily Repldoc 71912008
Receive Surface Water Treatment Facility Conceptual Design and Feasibility Evaluation Report
July 16, 2008
Page 2
1. The project site is located outside the 100-yearflood plain and possesses no known
environmental constraints.
2. The water supply turnout on the WID canal has been preliminarily approved by the California
State Department of Public Health.
3. The preliminary sanitary survey shows there are few, if any, substantial threats of contamination
upstream from the plant site.
4. The water plant and adjoining park uses can be accommodated on the 13 -acre site. Additional
site planning will occur in the future phases of the project.
5. River -viewing and educational multi-purpose facilities can be incorporated into the operations
building at the water plant.
6. Efficient distribution of treated water can be accomplished by constructing a new transmission
main southerly from the site along Mills Avenue.
7. Very minimal taste and order effects are anticipated as a result of blending the surface water and
groundwater. Minor effects can be mitigated or they would expire over time.
The recommended next steps toward the implementation of the Surface Water Treatment Facility Project
include:
1. Conduct a source water sampling program on a monthly basis for 24 months to comply with the
Long Term 2 Surface Water Treatment Rule and to quantify other parameters important to the
design.
2. Prepare a watershed sanitary survey that conforms to the requirements of the California Health
Department.
3. Prepare preliminary design documents using final design criteria, update the site plan layout and
building floor plans, develop processflow schematics, and finalize the scope of transmission and
well improvement. Construction cost estimates will be refined as part of this effort.
FISCAL IMPACT: The approximate cost for the next steps in the project is $600,000. The
professional services contract for these services will be developed in the
future and brought back to the City Council for approval.
FUNDING AVAILABLE: Water ppm( nt Impact Fees (182)
/tFans, Budget
kaou
Manager
F Wally S Aplin
PublicWorks Director
FWSlbss
Attachment
cc: Kirk Evans
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May 2008
Surface Water Treatment Facility
Conceptual Design and Feasibility Evaluation
CITY OF LODI
Administrative Draft
May 2008
Q�OVESSIONQ
Richard Stratton
NO. 37261
EXP, 06/30/2008
t'0// 8�
�Tl4TF OF GALIFO���P
Prepared underthe responsible charge of
Richard Stratton, Project Manager
Registration Number 37261
gy-
2365 Iron Point Road, Suite 300
Folsom, CA 95630
In Association with West YostAssociates
Table of Contents
Summary Report
Introduction...............................................................................................................................
1
Project Goals and Report Preparation Approach.....................................................................................
1
Background...............................................................................................................................................
1
ExistingWater System.........................................................................................................................
1
Projected Water Demands and Sources of Supply..............................................................................
2
ProjectObjectives.....................................................................................................................................
4
ReportFormat and Content......................................................................................................................
4
Recommended Action Items and Timeframe...........................................................................................
5
Authorization.............................................................................................................................................
7
Acknowledgements...................................................................................................................................
7
Tableof Abbreviations.............................................................................................................
8
Summary of Technical Memorandums..................................................................................
11
TM 2 Alternative Site Selection..............................................................................................................
11
TM 3 Preliminary Watershed Assessment.............................................................................................
11
TM4 Regulatory Review.......................................................................................................................
13
TM 5 Treatment Process Design Development.....................................................................................
15
TM 6 Surface Water and Groundwater Blending...................................................................................
17
TM 7 Modificationsto Existing Delivery System....................................................................................
18
TM 8A Operations and Maintenance Facilities......................................................................................
19
TM 8B SCADA Facilities........................................................................................................................
19
TM 9 Environmental Considerations......................................................................................................
20
TM 10 — Capital and Operating Costs....................................................................................................
21
Raw Water Pipeline and Pump Station..............................................................................................
21
Surface Water Treatment Facility.......................................................................................................
21
TransmissionPipeline........................................................................................................................
21
Groundwater Supply Facility Improvements.......................................................................................
22
Operationsand Maintenance Cost Estimates....................................................................................
22
CostSummary....................................................................................................................................
22
TM11 Preliminary Financing Options....................................................................................................
23
TM 12 Feasibility Evaluation..................................................................................................................
24
TM 13 Geotechnical Considerations......................................................................................................
25
TM 14 Raw Water Pump Station...........................................................................................................
25
Recommended Treatment Plant............................................................................................
25
SiteLayout..............................................................................................................................................
25
ProcessDescription................................................................................................................................
27
OperationsBuilding.................................................................................................................................
27
City of Lodi 1
SWfF Conceptual Design and Feasibility Evaluation
TM 01 Summary Report 343957 63277.005 June 19.2008
I.
Summary Report
Reference Technical Memoranda (under separate cover)
TM 02 - Alternative Site Selection
TM 03 -Watershed Assessment
TM 04 - Regulatory Review
TM 05 - Treatment Process
TM 06 - Surface Water and Groundwater Blending
TM 07 - Modifications to Existing Delivery System
TM 08 -
8A Operations and Maintenance Facilities
8B SCADA Facilities
TM 09 - Environmental Considerations
TM 10- Capital and Operating Costs
TM 11 - Financing Options
TM 12- Feasibility Evaluation
TM 13- Geotechnical Considerations
TM 14 - Raw Water Pump Station
City of Lodi
SWfF Conceptual Design and Feasibility Evaluation
TM 01 Summary Report 34395763277.005
June 19,2008
f_
SUMMARY REPORT
Summary Report
City of Lodi Surface Water Treatment Facility ConceptualDesign and
Feasibility Evaluation
Introduction
Project Goals and Report Preparation Approach
The goals of the Surface Water Treatment Facility (SWTF) conceptual design and feasibility
evaluation include:
O Evaluating five alternative sites, including a fatal flaw analysis, to select a preferred site
for the SWTF. The evaluation should consider criteria including sufficient available
size, flooding hazards, environmental issues, pipeline costs to reach the site, site
improvements costs, other potential benefits of the site, and aesthetic compatibility with
surrounding land uses including access.
O Developing preliminary design criteria for the proposed SWTF and other needed
improvements including pipelines and well improvements, comparing membrane and
conventional filtration, and determining the estimated capital and operating costs of the
overall project. The design criteria should include an analysis of the needed capacity of
the SWTF in order to fully utilize the purchased water.
O Establishing an implementation plan and schedule for completing the preliminary
design, environmental documentation, final design, and the phased construction of the
project.
The approach to preparing and finalizing the report involves a logical sequence of first
evaluating the sites and selecting a tentative best site for the SWTF. This is followed by
selecting the preferred treatment process and developing a conceptual design and preliminary
costs. Based on the conceptual design, the best apparent site is reconfirmed. Financing options
for the project were to be developed as part of the feasibility evaluation, but instead will be
addressed in a future study after the actual project costs and potential funding sources are better
defined. The information developed in this report can be used by the City to decide between the
options of treating, selling, utilizing raw water for non -potable uses, or developing plans to
otherwise use the water that cannot be banked.
Background
Existing Water System
The City currently utilizes groundwater as its sole source of supply. The City's existing water
distribution system is a grid network of 6, 8, 10, 12 and 14 -inch diameter mains, two water
City of Lodi 1
SWTF Conceptual Design and Feasibility Evaluation
TM 01 Summary Report 343957 63277.005 June 19.2008
liJ�%
storage tanks, and a total of 27 grourx.e3 `%eater wells spaced at half -mile interna th Report
City. The capacity of the wells ranges from 1.2 to 3.0 million gallons aIs throughout the
total capacity of the 26 existing wells �i1d 2 planned wells is 54 ll d per day (mgd) and the
Am
and planned wells, only 14 wells cuY-r-4c�__.tly have standby chlorination equipong the 28 existing
The
groundwater is normally not chlorinat�,d in the distribution system. The city
Snt. approximately
12 -square miles in size and is borderevn the north by the Mokelumne River er and on the west
by the WID South Main Canal and Lo,�,�er Sacramento Road. The topography
that slopes gently to the southwest. Steri ting at the Mokelumne Riverat le elevation 55 the valley floor
falls to elevation 26 at the southwest c�i ner over a distance of approximately 6 -miles.
Projected Water Demands and Sourees of Supply
Projected Water Demands
The City's Urban Water Management plan (UWMP) projected the City, s
total future based on an average increase rate of 1 - S percent over the recorded 2004 demand of 17,011 aAFy
(15.2 mgd). Average annual potable water demands are expected to increase to 25,100 AFY
(22.4 mgd) by 2030. With 15 percent res '
ldential user conservation, the future demand is
anticipated to be reduced to 21,300 A,lpy 1( 19 mgd).
Current and Projected Water Supply
The City has historically used from 11,462 AFY of groundwater in 1970 to 17 011 AFY used
in 2004. Historical data indicate that the C>ity's groundwater elevation decreased on average
0.39 feet per year from 1927 to 2004, although groundwater elevation also fluctuates due to
annual rainfall. Historical groundwater elevation and annual rainfall are presented in Figure 1.
This figure indicates that the groundwater basin underlying Eastern San Joaquin Count
supplies the City's wells is in an overdraft condition. The 2005
y q Y that
field of the underling groundwater basin is approximately UWMP estimates that the safe
relationship. The declining groundwater basin i 15,000 AFY on an acreage -based
s a result of groundwater extraction by all
groundwater users in the area, including other cities, agriculture, private well owners, and the
City
The City plans to reduce its groundwater pumping in the long term as a
to stabilize the groundwater basin. To ac p of a regional effort
achieve this goal, the City of Lodi entered into a
purchase contract with Woodbridge Irrigation District (WID) in October 2003 and began
purchasing 6,000 acre-feet per year (AFy) of WID's pre -1914 Mokelumne River water
entitlement. The purchase is intended to supplement the City's water supply
et
water demands and to reduce the City's dependence on the groundwateraquiferThelCig term
evaluated alternatives for utilizing the purchased water including recharge in spreading basins
and construction of a surface water convev,,_ __ , .
current and future users.
The UWMP projected the future water supply Will include groundwater, surface water, and
recycled wastewater. The projected groundwater supply will be 15,000 AFY from now until
year 2030, based on an estimated safe yield of the groundwater basin servin the City.The
projected surface supply is 6,000 AFY from now until year 2043 based on acontractwith WID.
City of Lodi
SWTF conceptual Design and Feasibility Evaluation
TM 01 Summary Report 343957 63277.005 2
Jane 19,2008
1 L_ Summary Report
Potentially an additional 7,000 AFY could be secured after that based on the formula of 3 AF
of water for each acre of City land within the WID service area converted from agricultural to
municipal/industrial uses. The projected recycled water supply is 10,380AFY in 2030 based on
the UWMP.
35 , — 40
30 - --- — - -- - - - — _ _ 35
25
20
J
g 15
10
5
c
0
tGW Elevation j
Rainfall
-10
30
25
.Z
20i
0
1925 1955 1945 1955 1965 1975 1985 1995 2005
Year
Figure 1. Historical groundwater elevation and annual rainfall
Improvements to the WID water delivery system funded in part by the City's water purchase
include construction of an inflatable dam to raise the water level in the river. The City has not
yet used any WID water and has negotiated with WID to extend the banking period for unused
water. The diversion of WID water from the Mokelumne River is permitted from March 1
through October 15. The City is currently negotiating with EBMUD to allow operation of the
SWTF year-round with 1,000 AFY available from October 16 through the end of February.
WID has indicated they will be able to leave the inflatable dam in place year round to allow
water supply to the City through the recently completed fish screen and canal intake structure.
The intake structure is fitted with a 48 -inch outfall pipe to supply water to the City.
The City also investigated the possibility of using the purchased water to recharge the aquifer
with spreading basins. However, the costs of this option and the lack of control of the fate of
the water once it enters the aquifer has led the City to pursue utilizing the water by treating and
pumping the water into the existing water distribution system.
City of Lodi 3
SWfF Conceptual Design and Feasibility Evaluation
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Project Objectives
Summary Report
This report summarizes the conceptual design and feasibility evaluation of alternatives for a
surface water treatment facility, storage facilities, and distribution system improvements
capable of utilizing the full 6,000 AFY of purchased WID water. Objectives of the feasibility
evaluation include:
Q Selecting a site for the water treatment plant and ensuring there are no known
environmental constraints or technical/engineering problems with the site that would be
fatal flaws to implementing the project.
g Evaluating conventional and membrane treatment processes and selecting the best
treatment technology based on an evaluation of Mokelumne River water quality and
regulations. Based on the preferred treatment process, develop a conceptual design for
the SWTF.
Q Performing modeling of the water distribution system to evaluate transmission main
options to convey treated water from the new SWTF to the City's existing water system
also considering supplying water to future development on the west side of the City.
Q. Performing field investigation of the existing well sites and identifying required
improvements to provide chlorination capability.
Q Evaluating upgrades to the existing City SCADA system
Q Evaluatingblending of surface water and groundwater including an evaluation of the
existing distribution system piping corrosion layers. Develop recommendations for
treatment or other needed measures to prevent customer taste and odor complaints.
Q Evaluation of options for upgrading the City's SCADA system and operations and
maintenance activities to accommodate the new SWTF and well improvements.
Q Determining all permits required for the Project and establishing an approach for
environmental CEQA compliance.
Q Estimating the total capital and operating cost for the Project and developing a financing
plan for the project.
O Laying out a plan for the next steps to implement the project and developing a project
schedule.
Report Format and Content
The Surface Water Treatment Facility conceptual Design and Feasibility Evaluation Report
consists of this Summer' Report and a Technical Appendix with the individual subject
technical memorandums (TMs) as follows:
1. Summary Report
Technical Appendices:
2. Alternative Site Selection
City of Lodi 4
SWTF Conceptual Design and Feasibility Evaluation
TM 01 Summary Report 343957 63277.005
June 19.2008
3. Preliminary Watershed Assessment
4. Regulatory Review
5. Treatment Process Design Development
6. Compatibility of Groundwater and Surface Water Supplies
7. Modifications to Existing Delivery System
8a. O&M Facilities
8b. SCADA Facilities
9. Environmental Considerations
10. Capital and Operating Costs
11. Financing Options
12. Feasibility Evaluation
13. Geotechnical Considerations
14. Raw Water Pump Station
Recommended Action Items and Timeframe
The recommended next steps towards implementation of the SWTF project include:
Conduct Source Water Sampling — Sampling of the Mokelumne River for Cryptosporidium
should be started in accordance with Source Water Monitoring Guidance Manual for Public
Water Systems under the Long Term 2 Enhanced Surface Water Treatment Rule (LT2). The
proposed sampling location should be at the recently constructed WID canal intake/fish screen.
At least 3 months prior to sampling, the City must submit the proposed sampling plan to CDPH
for approval. LT2 requires at least monthly sampling for 24 months for the following:
Cryptosporidium, E. Coli, and turbidity. Additional parameters that should be measured
include: pH, alkalinity, conductivity, hardness, iron, manganese, total organic carbon, dissolved
organic carbon, total and fecal coliform, and temperature.
Prepare Watershed Sanitary Survey — A watershed sanitary survey (WSS) that conforms to
the CDPH Surface Water Treatment Rule requirements should be completed. The WSS will
allow for determination of the treatment requirements for Cryptosporidium that will need to be
incorporated into the SWTF design.
Prepare Preliminary Design Report — The preliminary design report will include
confirmation of the SWTF design capacity, update of the site layout and building floor plans,
alternative analyses and final selection of treatment processes, updated process flow
schematics, and update of transmission main and well improvements plans. The report will
serve as the basis of design for the final design and will provide detailed information that will
be used for environmental documentation and an updated cost estimate. Other activities that
may take place during the preliminary design phase include further geotechnical investigation
and bench scale testing and/or pilot testing to confirm membrane design parameters.
City of Lodi
SWTF Conceptual Design and Feasibility Evaluation
7M 01 Summary Report 343957 63277.005 June 19, 2008
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Summary Report
Financing Plan — Once project costs are better defined during the preliminary design and
potential funding sources are identified, a financingplan should be developed that looks at
funding sources, finance options and rate impacts.
CEQA Documentation — Preparation of an initial study is recommended to establish the need
for either a mitigated negative declaration of full EIR for the project. As part of the CEQA
process public meetings can be held to provide education about the project. Needed permits
will be determined as part of the CEQA documentation process.
Detailed Design — The detailed design will include preparation of detailed plans and
specifications for the SWTF, pipelines and well improvements. Necessary building permits will
be obtained. A final construction estimate based on the completed design will be prepared.
Bidding and Contractor Selection — Bid documents will be prepared and advertised for bid by
qualified contractors. Bid results will be reviewed and if acceptable a notice of award will be
made to the lowest responsible, responsive bidder.
Construction and Start-up — Construction of the first phase project is anticipatedto take
approximately 15 months. Towards the end of construction, an operations and maintenance
manual will be prepared and used to train operators for the new SWTF. Newly trained
operators would then be involved with the start-up and testing of the new SWTF.
A proposed project implementation schedule is presented in Table 1.
Table 1: Proposed Schedule
Project Activity
Feasibility . . A 1
■.����-m-
2007
2008 2009 2010 2011
....... ■...
..........■
A I . 1-
..■.■■
Final Design
Bid and Awardi
.6111 1 •
..■.■...■■.■__
__...
First Year 1" r 1 •
..■.■.....
■. ■■.. �����
Assumes conventionaldesign/bid/build delivery.delivery11 •" design/build,
..design/build/commission,or •" 1 • /"
City of Lodi
SWTF Conceptual Design and Feasibility Evaluation
7M 01 Summary Report 343957 63277.005
6
June IY. 2008
tq
Authorization
Summary Report
The Agreement for Consulting Services and Notice to Proceed for the Surface Water Treatment
Facility Conceptual Design and Feasibility Evaluation was received by HDR on May 11,2007.
Acknowledgements
The following people are acknowledged as having contributed to the preparation of this report:
City of Lodi: Richard Prima, Wally Sandelin, Charles Swimley, Frank Beeler, Kevin Gaither,
Lyman Chang, and Mark Lindseth.
HDR Engineering: Robert Ellis, Richard Stratton, Shugen Pan, Michele Stern, Michael
Lambert, and Larry Smithey.
West Yost Associates: Bruce West, Chris Ewers, Richard Hubel, and Gerald Fej arang.
City of Lodi
SWTF Conceptual Design and Feasibility Evaluation
7M 01 Summary Report 14395763277.005
7
June 19,2006
����Wxa M� Aft Al
flSiminiary Report
Table of Abbreviations
AFY Acre-feet per year
AAWARF American Water Works Association Research Foundation
BMPs
Best Management Practices
CAA
Clean Air Act
Cal EPA
California Environmental Protection Agency
CCIC
Central California Information Center
CCT
Central California Traction Company
CDFG
California Department of Fish and Game
CDPH
California Department of Public Health
CEQA
California Environmental Quality Act
CHRIS
California Historical Resources Information System
CIP
Clean -in -Place
City
The City of Lodi
CNDDB
California Natural Diversity Database
CNPS
California Native Plant Society
CWA
Clean Water Act
D/DBP
Disinfectants/Disinfection Byproducts
DAF
Dissolved air floatation
DBPs
Disinfection byproducts
DE
Diatomaceous Earth
DOC
dissolved organic carbon
DTSC
Department of Toxic Substances Control
EBMUD
East Bay Municipal Utility District
FIFRA
Federal Insecticide, Fungicide, and Rodenticide Act
fps
Feet per second
FRP
Fiber -reinforced plastic
GAC
Granular activated carbon
gfd
Gallons/ft2/day
gpm
Gallons per minute
GWR
Ground Water Rule
HAAs
Haloacetic acids
HOCI
Hypochlorous acid
HPC
Heterotrophic plate count
IDSE
Initial distribution system evaluation
IESWTR
Interim Enhanced Surface Water Treatment Rule
LCP
Local control panel
LCR
Lead and Copper Rule
LMRWSPC
The Lower Mokelumne River Watershed Planning Committee
LTIESWTR
Long Term 1 Enhanced Surface Water Treatment Rule
LT2ESWTR
Long Term 2 Enhanced Surface Water Treatment Rule
MCC
Motor control center
MCL
Maximum contaminant level
City of Lodi 8
SWTF Conceptual Design and Feasibility Evaluation
TM 01 Summary Report 34395763277.005 June 19.2008
fl
MDS
Microwave Data Systems
MF
Microfiltration
mg/L
Micrograms per liter
mg/L
Milligrams per liter
Mgal
Million gallon
mgd
Million gallons per day
MIB
Methylisoborneol
ML
Milliliter
MRDLs
Maximum residual disinfectant levels
MRDLs
maximum residual disinfectant levels
NAHC
Native American Heritage Commission
NF
Nanofiltration
NF/RO
Nanofiltration or reverse osmosis
NMFS
National Marine Fisheries Service
NOM
Naturally -occurring organic matter
NPDES
National Pollutant Discharge Elimination System
NPSMP
Non -Point Source Management Plan
NRCS
Natural Resources Conservation Service
NRHP
National Register of Historic Places
NTU
Nephelometric turbidity units
OES
Office of Emergency Services
PAC
Powered activated carbon
PL 92-500
Federal Water Pollution Control Act
PLC
Programmable logic controller
PRVs
Pressure -reducing valves
psi
Pounds per square inch
RCRA
Resources Conservation and Recovery Act
RMC
RMC Water, Inc.
RO
Reverse Osmosis
ROW
Right-of-ways
RTUs
Remote Telemetry Units
RWPS
Raw water pump station
RWQCBs
Regional Water Quality Control Boards
SCADA
Supervisory control and data acquisition
SDWA
Safe Drinking Water Act
SJCRCD
San Joaquin County Resource Conservation District &
SOCs
Synthetic organic chemicals
SWRCB
State Water Resources Control Board
SWTF
Surface Water Treatment Facility
SWTR
Surface Water Treatment Rule
TAC
Technical Advisory Committee
TCR
Total Coliform Rule
TDS
Total dissolved solids
THMs
Trihalomethanes
TMs
Technical memorandums
TOC
Total organic carbon
Citv of Lodi
SWTF Conceptual Design and Feasibility Evaluation
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Summary Report
9
June 19. 2008
lil
TSCA
Toxic Substances Control Act
TT
Treatment techniques
TTHMs
Total trihalomethanes
TTHMs
Trihalomethanes
UC
University of California
OF
Ultrafiltration
UPRR
Union Pacific Rail Road
USACE
U.S. Army Corps of Engineers
USEPA
U.S. Environmental Protection Agency
USFWS
U.S Fish and Wildlife Service
USGS
U.S. Geological Survey
UV
Ultraviolet
UWMP
Urban Water Management Plan
VFD
Variable frequency drive
VOCS
Volatile organic chemicals
WDRs
Waste Discharge Requirements
WTP
Water Treatment Plant
City of Lodi
SWTF Conceptual Design and Feasibility Evaluation
TM 01 Summary Report 343957 63277.005
Summary Report
10
June 19.2008
falSummary Report
Summary of Technical Memorandums
A brief summary of each of the individual technical memorandums (TMs) is presented here.
These TMs include the technical evaluations, alternative present worth analyses, other pertinent
evaluations, and conclusions/recommendations.
TM 2 Alternative Site Selection
Five alternative treatment plant sites were evaluated to assess their feasibility for constructing a
SWTF. The locations of the treatment plant sites and the needed raw water and treated water
distribution pipelines alternative alignments are shown in Figure 2. The feasibility evaluation
was based on the criteria listed below.
® Sufficient size of site (at least S acres needed).
OO Environmental issues and the ability to avoid significant environmental impacts.
O Estimated costs including transmission pipeline costs and site improvement costs.
OO Other benefits such as aesthetic compatibility and use of facilities by public for
educational purposes.
A site was eliminated if a significant impact to the environment was identified or the site was
not of sufficient size. Alternatives were ranked based on the estimated costs of the project
components that are site dependent, with the lowest cost project ranked first. The selected site,
(Lodi Lake Site) is of sufficient size, does not have any significant environmental impacts, is
the lowest overall cost site, and also provides the opportunity for public education relating to
the river and water supply.
Conclusionsand Recommendations
The site selection process was performed early in the process and even preceded many of the
other TMs. After completion of the TMs the results presented in the Summary Report still
confirm the decision to select the Lodi Lake Site to be correct.
TM 3 Preliminary Watershed Assessment
The objectives of this TM are: (1) to review existing watershed reports/data and summarize
water quality data; (2) to identify human and natural activities that may affect water quality;
and (3) to determine the level of treatment required based on identified microbiological and
other contaminant sources.
This TM provides an overview of the Lower Mokelumne River watershed between Camanche
Dam and the Woodbridge Irrigation District (WID) Canal intake and will serve in the future as
a basis for the watershed sanitary survey for the SWTF. The Upper Mokelumne River
watershed consists primarily of forests and lightly populated open land.
City of Lodi 11
SWTF Conceptual Design and Feasibility Evaluation June 19,2008
TM 01 Summary Report 343957 63277.005
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Additionally, Pardee and Camanche Reservoirs separate the Upper and Lower Mokelumne
River watersheds. For this reason thi s TM focuses on the Lower Mokelumne River watershed.
The drainage area below Camanche Dalin encompasses 80 square miles and is mostly
agricultural with some urbanized land_ 'The City of Lodi is the only incorporated city in the
watershed. Other communities include-Acampo, Lockeford, Clements, Victor, and
Woodbridge. Outside the urban areas, agricultural use predominates in the watershed from
Camanche Reservoir to Lodi. Estimated agricultural use trends are 51 percent vineyard, 31
percent dairy/grazing, 9 percent orcharc;. g percent annual cropland, and 1 percent idle.
The potential contaminant sources in the watershed are low to moderate and include: Urban,
and industrial runoff; Agricultural runoff from: grazing animals, concentrated animal facilities,
pesticide/herbicide use; Wild animals; Mine runoff; Solid and hazardous waste disposal
facilities; Recreational use; Unauthorized activity; Transportation corridors and bridges;
Geologic/seismic hazards; and Fires.
The City of Lodi Public Works Departrrlent collected water quality data at four sampling sites
from May 2006 through July 2007. Water quality at Site 1 (Mokelumne River), which is not
affected by the operation of Woodbridge Dam, was sampled throughout the year. Water quality
at Sites 2 and 3 (WID Canal) was sampled only from April through October when water was
present in the WID Canal. Water quality at Site 4 (Woodbridge Dam) was sampled only from
November through March. It should be noted that data represent the general quality of the
water at the sampling sites. Additional sampling has been performed by City Storm Water
trackers during the winter season. This data has shown that the raw water turbidity could be
greater than 50 NTU during a storm event.
Conclusions and Recommendations
Overall, the Mokelumne River is an excellent water source that has low total dissolved solids
(TDS) and total organic carbon (TOC) concentrations. No "fatal flaws" in water quality or
contamination threats were discovered. The levels of total coliform and Giardia Cysts are
slightly elevated. A surface water treatment plant utilizing either membranes or the
combination of conventional filtration followed by ultraviolet disinfection is recommended.
A watershed sanitary survey (WSS) that conforms to the CDPH Surface Water Treatment Rule
requirements should be completed. The WSS will allow for determination of the treatment
requirements for Cryptosporidium that will need to be incorporated into the SWTF design.
TM 4 Regulatory Review
The delivery of a treated surface water supply into the City water system will require additional
water quality monitoring and data reporting and compliance with additional drinking water
regulations. Many of the drinking water regulations are applicable to both the existing
groundwater supplies and the proposed surface water Supply, but several regulations that will
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apply to the surface water supply are a►f minimal relevance to the existing groundwater
supplies.
Drinking water regulations of particulair importance to the surface water supply project include:
p National Primary Drinking Water Regulations (1975)
O Secondary Drinking Water Regulations (1979, 1991)
O Phases I, II and V Regulations (19$7, 1991 and 1992, respectively)
O Surface Water Treatment Rule ( 1 9 8 9)
O Total Coliform Rule (1989)
p Lead and Copper Rule (1991)
p Consumer Confidence Reports R u I e (1998)
O Stage 1 Disinfectants and Disinfection Byproducts Rule (1998) that supersededTotal
Trihalomethane Rule (1979)
O Interim Enhanced Surface Water Treatment Rule (1999)
Q Unregulated Contaminants Monitoring Rule — First Cycle (1999)
O Groundwater Rule (2006)
p Filter Backwash Recycling Rule (200 1)
p Long -Term 2 Enhanced Surface Water Treatment Rule (2006)
p Stage 2 Disinfectants and Disinfection Byproducts Rule (2006)
p Unregulated Contaminants Monitor. ing Rule — Second Cycle (2006)
The California Department of Public Health (CDPH) is a primacy agency with responsibility
for enforcement of the federal and state S afe Drinking Water Acts. In some cases, the CDPH
has yet to establish a state regulation as a companion to a federal regulation, but is responsible
for enforcement of the federal regulation (e.g. Groundwater Rule). On the other hand, the
CDPH has established several maximum contaminant levels (MCLS) that are more stringent
than the corresponding federal MCLS and additional MCLs for several federally unregulated
contaminants. The more stringent of the CDPH and federal regulations and MCLs will apply to
the SWTF project.
The SWTF design is anticipated to provide the City with the necessary tools to achieve and
maintain compliance with the current drinking water regulations. However, the CDPH may
promulgate additional regulations affecting the SWTF design in the future. The initial design
can address any additional regulatory requirements that take effect prior to SWTF construction.
Future regulatory requirements are best accommodated by designing the SWTF for adaptability
and including space allowances for future plant additions.
City of Lodi
SWTF Conceptual Design and FeasibilityEvatuation
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Conclusionsand Recommendations
The City is advised to conduct a comprehensive water quality monitoring and testing program
to better characterize the surface water supply, and address the findings of this program in the
SWTF design. In future preparation for SWTF startup, the City will need to expand its water
quality monitoring program for the distribution system in consultation with the CDPH to ensure
compliance with the regulatory requirements.
Sampling of the Mokelumne River for Cryptosporidium should be started in accordance with
Source Water Monitoring Guidance Manual for Public Water Systems under the Long Term 2
Enhanced Surface Water Treatment Rule (LT2). The proposed sampling location should be at
the recently constructed WID canal intake/fish screen. At least 3 months prior to sampling, the
City must submit the proposed sampling plan to CDPH for approval. LT2 requires at least
monthly sampling for 24 months for the following: Cryptosporidium, E. Coli, and
turbidity. Additional parameters that should be measured include: pH, alkalinity, conductivity,
hardness, iron, manganese, total organic carbon, dissolved organic carbon, total and fecal
coliform, and temperature.
Various other regulations and permitting requirements will affect the SWTF design,
construction and operation. Therefore, the City is advised to meet and consult with CDPH on a
regular basis over the course of project development and to include a permitting action plan in
the scope of services for the SWTF design phase to avoid significant delays in obtaining the
necessary construction and operation permits.
TM 5 Treatment Process Design Development
The design capacity of the SWTF should be sufficient to treat the contracted surface water and
future surface water supplies. The design capacity should allow for treating the available
surface water per the WID agreement and allow the wells to be exercised throughout the year.
For the purposes of this analysis, it is assumed that the first phase of the SWTF will be required
to fully utilize the 6,000AFY contracted surface water. The SWTF will treat 5,000 AF from
March 1 to October 15 and 1,000 AF from October 16 to end of February, assuming that
EBMUD allows the City to use 1,000AFY during winter. The required design capacity of the
first phase SWTF is 8 mgd. The final phase of the SWTF could potentially be sized to fully
utilize the maximum 13,000AFY of potential future contracted water. The SWTF will treat
11,000AF from March 1 to October 15, and 2,000 AF from October 16 to end of February,
assuming a 2,000 AF winter diversion is allowed by EBMUD. The estimated design capacity of
the final phase SWTF is 20 mgd.
Treatment technologies available for the SWTF include either a conventional process
consisting of coagulation, flocculation, sedimentation, dual media (anthracite/sand) filtration;
or a membrane treatment process utilizing microfiltration or ultrafiltration membranes. Design
criteria for each alternative treatment process are developed considering raw water quality,
treated water quality goals. The alternatives were compared based on capital cost, operation and
maintenance cost, and other factors.
City of Lodi
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Conclusions and Recommendations
Both conventional treatment and membrane treatment were evaluated for the SWTF ands both
technologies could treat the water to meet current regulations. Membrane filtration is
recommended based on its ability to provide a positive barrier against pathogens, smaller foot
print, less chemical usage, lower sludge production, ease of expansion, and lower total present
worth cost.
Based on the initial and final phase surface water demands, it is recommended that the City
construct an 8 MGD SWTF for the first phase. This size of plant will allow utilization of the
current 6,000 ac -ft per year contracted water. Any banked water over and above this amount
will be available for sale or other non -potable uses within the City. Space should be reserved
for a future planned expansion to 20 mgd.
Picture of two Memcor submerged membrane systems (Yuba City, CA- upper left, and Bendigo,
Australia- lower left), a Zenon 1000 membrane cassette module (South San Joaquin Irrigation
District -upper right), and a Pall pressure membrane system (Yucaipa Valley Water District- lower
right)
Disinfection usually is the last step of a treatment process and provides the final barrier against
pathogens prior to pumping to the distribution system. Types of disinfection systems
City of Lodi 16
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considered include ultraviolet (LTV) light, chlorine, chloramines, and ozone. To meet EPA and
California Department of Public Health regulations log removal/disinfection of pathogens and
to maintain a residual in the distribution system, chlorine is recommended. To minimize risks
to the public sodium hypochlorite solution is the recommended form of chlorine to be added.
Two buildings are proposed for the SWTF — one to house the membrane filtration equipment,
offices, laboratory, control room, and public education element and a second building for
chemical storage, residuals handling, workshop and high service pumping. The building
architecture will be selected to enhance and compliment the surrounding area.
TM 6 Surface Water and Groundwater Blending
The treated surface water supply will account for about one-third of the total delivery into the
water distribution system, on average, but potentially ranging from zero to nearly 100percent
of the total delivery depending on day-to-day and month of the year water supply operations.
Some customers are likely to receive one source of supply almost exclusively. Other customers
may experience frequent changes depending on their geographic locations with respect to the
existing groundwater supplies and the proposed surface water supply. Due to the anticipated
changes and variations in distributed water quality, groundwater and surface water supply
compatibility is an important consideration for corrosion control, regulatory compliance, and
customer satisfaction.
Maintenance of a detectable chlorine residual throughout a surface water distribution system is
required by the Surface Water Treatment Rule, and continuous disinfection of most
groundwater supplies is required by the recently promulgated Groundwater Rule. Therefore, the
City will need to retrofit chlorination equipment and continuously chlorinate the groundwater
supplies when required by the Groundwater Rule or concurrently with SWTF startup,
whichever comes first.
The existing distribution system contains pipelines, fittings and valves constructed of various
metallic and non-metallic materials. The City's piping has experienced below average rates of
pipeline corrosion with the existing groundwater supplies. However, the Mokelumne River
water is relatively soft, has a tendency to dissolve calcium carbonate, and without treatment,
could increase the rates of corrosion of unlined iron and steel pipelines and the erosion of
asbestos -cement pipelines. Proposed chemical additions at the SWTF will reduce the corrosion
potential and the related effects on distributed water quality, but cannot achieve complete
compatibility of the groundwater and surface water supplies. Older galvanized steel service
connections and plumbing materials are particularly susceptible to increased rates of corrosion
particularly after initial introduction of surface water before equilibrium is achieved.
Conclusions and Recommendations
Given the low levels of corrosion scales observed in the existing distribution system, blending
of surface water with the existing groundwater system will be feasible with adjustment of pH
and addition of corrosion inhibitor to the surface water entering the distribution system.
City of Lodi 17
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The City should initiate continuous chlorination of the groundwater supplies at least several
months prior to SWTF startup, and gradually increase the chlorine dosages, to acclimatize the
customers and pipelines to the presence of chlorine residuals.
The City should initiate a public education program in advance of groundwater chlorination and
SWTF startup to prepare the City water customers for the anticipated changes in water quality.
TM 7 Modifications to Existing Delivery System
With the introduction of a new surface water supply, distribution system modifications will be
required to distribute surface water efficiently to the existing distribution system and to modify
existing groundwater wells to accommodate water quality monitoring and disinfection
regulations.
The City's hydraulic model was used to determine which modifications will be most effective
at integrating the Phase 1 flows from the SWTF. The hydraulic model was operated by City
staff. When an analysis was needed for this project, the project team submitted modeling
requests to the City, and the City returned results in the form of mapping and pumping rate
tables.
The Phase 1 SWTF production facility is sized to deliver 8.0 million gallons per day (MGD), or
approximately 5,600 gallons per minute (gpm). The SWTF will operate year-round to provide
the 6,000 acre-feet per year available from the Woodbridge Irrigation District. The SWTF will
store as much as 3.0 million gallons in its clearwell, allowing the SWTF to provide as much as
10 MGD, or approximately 7,000 gpm, to the distribution system during peak demands. The
modeling was performed based on maintaining a wellhead pressure of 60 psi and meeting the
City's pressure criteria for fire flow and peak hour demands.
Two transmission main alignments were evaluated by the model: 1) Holly Drive — 6,000 feet of
24 -inch diameter pipeline and 2) Mills Avenue 2,450 feet of 36 -inch diameter pipeline. Based
on this evaluation, it is recommended that the City construct a 36 -inch -diameter transmission
pipeline beginning at the existing 10-, 12-, and 14 -inch -diameter pipes at the intersection of
North Mills Avenue and West Turner Road, then south along North Mills Avenue to the
intersection with West Lockeford Road, connecting to existing pipelines six inches in diameter
and larger with PRVs to allow maintain existing pressures in the distribution system to allow
for exercising existing wells.
The hydraulic modeling also indicates that the City will not need to replace any of the well
pumps with higher -head pumps due to the surface water supply, but this assessment must be
validated by calibrating the model.
Conclusions and Recommendations
Only one of the existing groundwater supply facilities already has permanent chlorination
equipment. With the introduction of surface water, it is recommended that all of the other
groundwater supply facilities be updated to a common sodium hypochlorite continuous
City of Lodi 18
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f..l. Summary Report
chlorination configuration to meet EPS and State regulations for maintaining chlorine residual
in distribution systems.
The following modifications to the existing well installations and distribution system are
recommended:
® Chlorination of each S7 it t" ly to provide a minimum of 0.5 mg/L of residual
chlorine at the entry point into the distribution system.
® Continuous monitoring of the chlori"e residual at each distribution system entry point.
O A supervisory control and data acquisition (SCADA) system should monitor the
chlorine residual measurements, well pump on/off status, and the chemical feed pump
on/off status, and alert the on-call operator of any anomalies or failures of the
chlorination system operation.
O Construction a 36 -inch -diameter transmission pipeline beginning at the intersection of
North Mills Avenue and West Turney- Road, then south along North Mills Avenue to the
intersection with West Lockeford Road, connecting to existing pipelines six inches in
diameter and larger with PRVs to allow maintain existing pressures in the distribution
system to allow for exercising existing wells.
TM 8A Operations and Maintenance Facilities
Conclusions and Recommendations
Based on discussions with City operations and engineering staff, it was agreed that the
functions at the site should be separated into two buildings based on whether they are "clean'
or "dirty" tasks. The proposed operations building ("clean" building) will contain laboratory,
and administration facilities that will showcase the advanced membrane treatment technology
and SCADA system with public exhibits in the Operations building. Only the Operations
building will be designed to meet the requirements of the American with Disabilities Act
(ADA). Of the proposed two stories in the Operations building, the first floor will include an
electrical maintenance shop, lobby, locker rooms administration, laboratory, offices, process
control center, and filtration room. The second floor will include the meeting rooms, exhibit
space, and public restrooms.
The facilities associated with dirtier activities are proposed for the Accessory Building. This
building will include chemical handling facilities, solids dewatering, high service pumps,
workshops for technical staff, spare parts warehouse, mud room, and a unisex lavatory. A
maintenance shop and storage area will be provided in the chemical building.
TM 8B SCADA Facilities
The existing utilities Supervisory Control, Alarm, and Data Acquisition (SCADA) system
consists of Remote Telemetry Units (RTUs) located at the well sites, lift stations, and pump
stations. The existing RTUs are Landis & Gear units that are in the process of being replaced
with PLC based RTUs. The current system network utilizes a leased telephone line and
City of Lodi
SWTF Conceptual Design and Feasibility Evaluation 9
TM 01 5urnniarY Report 343957 63277.0[)3
June 19, 2008
taqSummary Report
communicates over the telephone lines to the RTUs. The new RTUs are expected to
communicate in a similar fashion. The existing central station is located at the City's
corporation yard and the operator monitors the water system, storm water system, wastewater
system and the power system at the same location. In addition to the telephone line
communication, there is an existing fiber optic cable network installed on the City's power
distribution poles. The fiber optic cable network is connected to the central station, City Hall,
Police Department and provides connections to various electrical substations for monitoring
and communication.
Recommendations
Utilizing the existing fiber optic network to the extent possible is recommended. The existing
fiber optic cable network could be easily extended to the surface water treatment facility
(SWTF) site. There is a fiber optic node at the Maclane substation which is adjacent to the
proposed site of the SWTF. The reliability and speed of communicating over fiber optic cable
is much better than operating over a radio link or telephone. At each remote site, (well, lift
station, and pump station) the cost of connecting to the fiber optic cable should be evaluated.
The recommended PLCs for the SWTF are Allen Bradley and the recommenced SCADA
program is RSView. This matches the PLCs and SCADA program used at the White Slough
WWTP. Plant operators and technicians are already familiar with these systems, which will
allow for more efficient overall operation for the City.
TM 9 Environmental Considerations
The City of Lodi Public Works Department identified four potential SWTF sites and gave HDR
the option of identifying one or more additional sites to be included in the screening process,
Sites A through D were identified by the City as potential SWTF sites (Figure 2). Site E was
identified by HDR as an additional potential site based on its location along the Woodbridge
Canal and near the west side of the City's water distribution system (Figure 2).
Reconnaissance -level field surveys were conducted for each of the five selected sites and their
general pipeline routes. In addition, aerial photographs, U.S. Geological Survey (USGS)
quadrangle maps, and other readily available information about each alternative site were
reviewed. The environmental constraints associated with the five potential SWTF sites and the
general routes of their respective raw and treated water pipeline were evaluated. Constraints for
evaluation include land use, biological resources, and cultural resources. The purpose of this
study is to identify any "fatal flaws" stemming from environmental issues at each alternative
SWTF site. This assessment is qualitative in nature, rather than quantitative. A qualitative
assessment is suited to fatal -flaws analysis because environmentally -related fatal flaws are
readily identifiable with coarse -level detail.
The Lodi Lake Site possesses the least constraints for development based on land use and
biological resources. The General Mills site possesses the fewest constraints based on
biological and cultural resources. Because of land use constraints, and biological and cultural
City of Lodi 20
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resources; the old landfill site along the railroad right-of-way is unacceptable as a potential site.
The sites along the WID canal would convert agricultural land to industrial uses.
Recommendations
Considering all environmental constraints, the Lodi Lake site would be the most acceptable site
forthe Surface Water Treatment Facility (SWTF).
No environmental fatal flaws were discovered for the Lodi Lake site.
TM 10 - Capital and Operating Costs
Implementation of the surface water supply project will require a major capital investment by
the City of Lodi (City) and will increase the operations and maintenance (O&M) costs for the
City water system. Therefore, preliminary capital and O&M cost estimates were prepared to
assist the City in budgeting for project implementation. The scope of this analysis is confined to
the Phase 1 flows for the project, the facilities necessary to deliver the water under the City's
existing contract with Woodbridge Irrigation District for 6,000 acre-feet per year of raw water.
The capital cost components include a raw water pipeline and pump station, surface water
treatment facility (SWTF), finished water storage facility and pump station, a transmission
main, existing groundwater supply facility improvements, and associated engineering and other
project delivery costs.
Raw Water Pipeline and Pump Station
Approximately 240 lineal feet of 48 -inch diameter pipeline are needed to connect the
Mokelumne River diversion facility to a raw water pump station, approximately 2,200 lineal
feet of 30 -inch diameter pipeline, and 340 feet of 30 -inch -diameter bore -and -jack crossing are
needed to connect the raw water pump station to the SWTF. The construction cost estimate is
$2.9 million, excluding contingencies.
Surface Water Treatment Facility
The primary assumptions for the SWTF construction cost estimate are a nominal capacity of
8.0 million gallons per day (mgd) to accommodate Phase 1 flows and the use of positive
pressure driven membrane filtration as described in Technical Memorandum No. 5 (TM 5). A
preliminary estimate of the construction cost itemized in Table 13 of TM 5 totals $21.7 million
(without considering the raw water pumping station), and excluding contingencies.
Transmission Pipeline
To accommodate the anticipated Phase 1 flow rates, the surface water supply project will
include approximately 2,450 lineal feet of 36 -inch diameter transmission pipeline and several
pressure reducing stations from the SWTF to the existing water distribution system. (See TM 7
and Table 3 for details.) The transmission pipeline cost estimate of $1,852,000. The estimated
construction costs are calculated with 2008 values and escalated to the anticipated years of
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construction. These projected values take into account the projected inflation rate for materials
and energy.
Groundwater Supply Facility Improvements
At present, chlorine residuals are not required or maintained in the water distribution system.
However, the City will need to implement continuous chlorination of the groundwater supplies
in the near future due to regulatory requirements addressed in TM 4. For the current evaluation,
it is assumed that the City will retrofit wells with chlorination equipment at wells 3R, 5, 6R,
l OC, and 13 through 17. The remaining groundwater wells would not require capital
improvements, and the City would not construct additional groundwater supply facilities for the
life of the surface water supply project. The individual groundwater supply facility
improvement construction cost estimates range from approximately $21,000to $29,000,
depending on well pump capacity. The total construction cost estimate of approximately
$232,000 for the nine groundwater supply facilities was escalated to the anticipated years of
construction.
The total project capital cost estimate including engineering, financing costs, and contingency
is $42.0 million in 2008 dollars.
Operations and Maintenance Cost Estimates
The O&M cost components include chemicals, labor, power, solids disposal, and outsourced
services starting in the first year (2011) of SWTF operations. The initial total annual estimated
cost including contingency is $2.2 million per year.
Cost Summary
The capital and O&M cost of the recommended projects is summarized in Table 2.
Table 2: Capital and O Ft M Costs
Capital Cost
Feasibility Study/Pre-Design @ 2% of Construction Cost $ 507,300
Detailed Design @ 8% of Construction Cost
Field Investigations/CEQA/ Permitting @ 3% of Construction Cost
Construction of Raw Water Pipeline and Pump Station
Construction of Surface Water Treatment Facility
Construction of Transmission Mains
Construction of Grndwtr. Well Station Improvements(w/Disch, Improvements)
Securing Bonds Q 1.5%of Construction Cost
Construction Management @ 7% of Construction Cost
Engineering Services during Construction Q 5% of Construction Cost
Subtotal
Combined Cost Contingency Q 30% of Construction Cost
Proje-t Cost
City of Lodi
SV TF Conceptual Design and Feasibility Evaluation
TM 01 Summary Report 343957 63277.005
$2,110,300
$791,400
$3,116,000
$20,798,000
$1,852,000
$613,000
$395,700
$1,846,500
$1,318,900
$33,349,100
$7,913,700
;$41,263,000
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June 19, 2008
-1 DR Summary Report
Chemicals (Groundwater)
$146,200
Chemicals (Surfacewater)
$515,600
Labor
$624,300
Net Power (SWTF minus groundwater well power costs)
$91,400
Solids Disposal
$26,000
OutsourcedServices
$63,200
Total Annual 0 & M Cost
$1,467,000
TM 1 1 Preliminary Financing Options
The original concept for financing the design and construction of the facility was based
partially on development fees from new construction. Due to the general economic slow down
and lack of residential development, both the fees from new construction and demand for
service from the water treatment plant have altered how we might pay for this project, and
certainly the time line for construction.
Goodwin Consulting Group (GCG) will coordinate with HDR and City staff to (i) compile cost
estimates for the water treatment facilities and ongoing O&M costs, (ii) confirm assumptions
related to existing and future development within the City, and (iii) identify the benefit units
(i.e. gallons per day or other factors) specific to each land use that were used by HDR to
estimate the cost of the improvements. GCG will set up a dynamic model that will be used to
allocate costs to participating land uses and to test scenarios developed in conjunction with the
City relative to the amount of contribution, if any, from existing land uses. GCG will then
calculate the one-time burdens that would result if the improvements were funded on a pay -as -
you go basis, which will define the "fair share" participation for each residential unit and non-
residential acre. If requested, GCG will present a projected revenue stream based on given
absorption assumptions to demonstrate how impact fee revenues would compare to facility
costs as development in the City progresses. This cash flow analysis is likely to demonstrate
that funding gaps will occur, which will mandate equity contributions or the use of public
financing mechanisms to generate lump -sum funding to close the gaps. GCG will prepare a
land -secured financing analysis to demonstrate annual cash flows assuming the sale of tax
exempt, Mello -Roos bonds to fund facilities as needed based on the infrastructure phasing
schedule. This analysis will be highly implementation -oriented and will consider all details that
could impact formation of a financing district and issuance of bonds.
GCG will also determine the monthly water rates that will be needed to pay the ongoing
operations and maintenance costs associated with the water treatment facilities. Once again,
GCG will work with HDR and the City to define various scenarios relative to participation by
existing rate payers and new development, and the monthly rate for each scenario will be
calculated.
City of Lodi 23
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TM 12 Feasibility Evaluation
Summary Report
A fatal flaw evaluation for the Lodi Lake site was conducted to ensure that site is suitable for
the SWTF. Further investigation of Site A was performed to uncover any potential fatal flaws.
A discussion of the potential fatal flaws and findings follows:
Environmental Hazards — A Phase I Environmental Site Assessment of the Lodi Lake site was
conducted by Youngdahl Consulting Group. A copy of the report is found in TM 13. The
findings indicate that the site was historically used as a vineyard until the 1980s and has been
fallow for the last 20 years. The assessment revealed no evidence of recognized environmental
conditions.
Geotechnical Issues — A feasibility level geotechnical investigation of the Lodi Lake Site was
conducted by Youngdahl Consulting Group (See TM 13). The study concluded that soil
conditions are good and that construction of the proposed SWTF at the Lodi Lake site is
feasible without the need for unusual or costly construction methods. HDR recommends that
the additional soil borings be drilled and the depth to groundwater checked again when Lodi
Lake is full to determine the high groundwater level at the site.
Abilit to o Supply Water to the Ci tX — The Lodi Lake site is well situated between the WID fish
screen intake point and the distribution system. Construction of a raw water pump station and
pipeline is presented in TM 14 and is found to be feasible. Construction of a finished water
pipeline along Mills Avenue to feed surface water into the distribution system was shown to be
feasible in TM 7.
Blending of Surface Water with Existing Groundwater System e — An evaluation of the water
chemistry of the surface water and its potential effects on the water distribution was evaluated
in TM 6. The evaluation concluded that by raising the pH and adding a polyphosphate
corrosion inhibitor, the surface water can successfully be blended with the groundwater with
minimal noticeable impacts to users. Addition of chlorination systems to the existing wells that
do not already have these facilities will be feasible.
Accessibility of Facilities for O&M activities — A detailed site plan was developed for the site
based on input from the City Parks Department. A joint use entrance off of Turner Road that
can be shared by both the park and the SWTF has been presented in TM 05.
Access to the SWTF and Park and sharing of the site will not present a fatal flaw.
Recommendations
Based on further analysis of the selected Lodi Lake Site, no fatal flaws were uncovered.
Construction and operation of the proposed SWTF at the Lodi Lake site is found to be feasible.
City of Lodi
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TM 13 Geotechnical Considerations
Summary Report
To further evaluate the feasibility of the recommended site, a geotechnical feasibility study and
a Phase I Environmental Site Assessment were conducted on the Lodi Lake site by Youngdahl
Consulting Group.
Recommendations
Based on the results of the field explorations and analysis, the feasibility study concluded that
construction of the proposed STWF at the Lodi Lake site is feasible from a geotechnical
standpoint as long as the recommendations in the report are incorporated into the design plans
and implemented during construction. The Phase I ESA found no recognized environmental
conditions at the Lodi Lake Site.
TM 14 Raw Water Pump Station
The raw water pump station design is based on supplying raw water to the SWTF. The initial
and final phase capacities of the SWTF are 8 million gallons per day (MGD) and 20 MGD,
respectively, based on TM 5 - SWTF Treatment Process Design Development. A preliminary
RWPS layout and pipeline alignment will be developed. The County is planning to widen and
reconstruct Lower Sacramento Road in the near future. Ideally, the pipeline alignment should
be determined in sufficient detail to be included in the design of the roadway improvements.
The initial phase is expected to be in operation in three years and the final phase will be built
much later.
The location of the RWPS is planned to be on property owned by WID to the west of Lower
Sacramento Road and south of the WID canal that is close to the fish screen and the 48 -inch
connection installed with the fish screen project. The pump station will include ultimately 6
vertical turbine pumps inside of a building and a standby generator. The City and WID are
negotiating to lease a portion of the WID owned land.
Recommendations
Three alternatives of the pipeline alignments were evaluated. The recommended alignment
calls for the 30 -inch pressure line to be located along the center of Lower Sacramento Road
until it reaches the UPRR tracks. At this point, the pipeline will make a turn before it enters the
UPRR right of way and run parallel to the UPRR outside the right of way beneath the cemetery.
It is expected that a permit from and/or coordination with the cemetery will be required for this
alignment.
Recommended Treatment Plant
Site Layout
A preliminary layout of the recommended SWTF at the Lodi Lake site is presented in Figure 3.
The SWTF consists of a membrane operations building and an ancillary building which
includes high service pumps, chemical storage and feed systems, and mechanical solids
City of Lodi 25
SWTF Conceptual Design and Feasibility Evaluation
TM 01 Summary Report 343957 63277.005 lurk; 19.2008
RESTROOMS
SHADE
STRUCTURES, TYP
TOT LOT
. .. .. .....
SWINGS
n
-
INU/ ....... .. ..... . .
---------- WTP'ENtOANCE
GENERATOR
24'x36' BUILDING
FOR PARK MAINTENANCE
24' LANDSCAPE
PLAN
1" = 120'
lu'l
CITY OF LODI
SURFACE WATER TREAMENT FACJlJTY
PROPOSED SITE PLAN
DATE
4/22/08
FIGURE
Figure 3
n"
CITY OF LODI
SURFACE WATER TREAMENT FACJlJTY
PROPOSED SITE PLAN
DATE
4/22/08
FIGURE
Figure 3
lu.� Summary Report
dewatering system. Other components of the SWTF include flocculationbasin, plate settler for
filter backwash water, filter backwash storage tank, and a 3.0 Mgal clearwell.
The preliminary SWTF site layout is based on a first phase capacity of 8 mgd. Space is
reserved for potential expansion to an ultimate capacity of 20 mgd and possible addition of
process components in the future. The plant will be accessed from Turner Road along the river
levy with an access road shared with the park. The SWTF will be integrated with the park
development with an educational facility located on the upper floor of the membrane filtration
building.
Process Description
The recommended process includes a raw water pump station on WID property near the canal
that will pump from the WID fish screen structure to the plant; an onsite flocculation basin
(with coagulant and/or powered activated carbon (PAC) addition, if needed); a membrane
filtration system including pumps and strainers; sodium hypochlorite (chlorine) disinfection, a
3.0 million gallon (Mgal) clearwell for contact time and storage; and high service pumping. In
addition to chlorine, chemicals to be added will include PAC if needed for taste and odor
control, alum as a coagulantto remove organics (if needed); soda ash to increase alkalinity and
provide a stable pH; and polyphosphate for treated water stabilizationto reduce corrosion of
distribution systems and prevent red water events. A schematic of the recommended process in
presented in Figure 4.
Operations Building
The membrane operation building has two stories. The first floor includes areas for membrane
filters and accessories, mechanical room, electrical room, and a workshop. The operations
room, laboratory, offices, break room, lobby area, and men and women's locker rooms are also
located in the first floor.
The second floor includes a conference room and several exhibit rooms/gallery from where the
public could view the Lodi Lake and Mokelumne River on one side and the membrane water
treatment systems on the other side. A balcony and open meeting room along with a small
kitchen is also provided to allow for public functions to be held. A preliminary layout of the
membrane operations building and an elevation view of the building are presented in Figures 5
and 6, respectively.
City of Lodi
SWTF Conceptual Design and Feasibility Evaluation
TM 01 Summary Report 34395763277.005
27
June 19,2008
REC
ALUM,
PAC
MOKELUMNE
RIVER
48"
t $ — � INTAKE
MEMBRANE
LOW LIFT GRIT FLASH FLOCULATION FEED
PS REMOVAL MIX BASIN PUMP
FISH
SCREEN
BACKWASH WASTE
HOLDING BASIN
TO BWW
HOLDING BASIN
MEMBRANE TREATMENT
SCALE: NONE
ALUM,
POLM
PLATE
SETTLER
FLOCULATION
CHAMBER
MECHANICAL
DEWATERING
BWW
AUTO
STRAINER
NON—POTABLE
WATER SYSTEM
RECYCLE
HOLDING TANK
MEMBRANE SOLIDS HANDLING
SCALE: NONE
C12, NaOH
MEMBRANE
MODULES
TO
—� LANDFILL
HIGH
CLEARWELL SERVICE
PUMPING
FLOW SCHEMATIC
MEMBRANE TREATMENT
CITY OF LODI — SURFACE WATER TREATMENT FACILITY
DATE
6/19/07
FIGURE
4
FIRST FLOOR PLAN
CITY OF LODI
SURFACE WATER TREAM ENT FACILITY
i1
PROPOSED MAIN OPERATIONS BUILDING PLAN
(DATE
4-15-08
FIGURE
Figure 5
ELEVATION
NTS
laz
CITY OF LODI
SURFACE WATER TREAMENT FACILITY
PROPOSED NORTH ELEVATION
5/2608
FIGURE
Figure 6
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