HomeMy WebLinkAbout2013-01-08 - Agendas WATER/SEWER/SOLID WASTE COMMITTEE AGENDA
MEETING DATE OF JANUARY 8, 2013
Taye evl e THE CITY OF FAYETTEVILLE,ARKANSAS
AR NA N 5�I
Committee: Aldermen: Mark Kinion, Sarah Marsh, Martin Schoppmeyer, Alan Long
Copy to: Mayor Lioneld Jordan; Sondra Smith, on Marr, Paul Becker, Lindsley Smith, Jeremy Pate, Chris
Brown, Lynn Hyke, Shannon Jones, Pe gy Bell, Tim Nyander, CH2M Hill, Allison Huskey
From: David Jurgens, P. E., Utilities Director U J lnA
A Fayetteville Water, Sewer and Solid Waste Committee meeting will be held on January 8, 2013, 5:15
PM, following the City Council Agenda Session, in roo 326, Fayetteville City Hall. Proposed topics include:
Agenda Items Requiring Committee Approval
1. Election of Committee Chair and Vice Chair.
2. Use Attainability Analysis Out of Scope Agreement with CH2M HILL for the completion of the Third
Party Rulemaking on the White River segment that the Noland Wastewater Treatment Plant discharges into for
$154,550, is attached. The UAA addresses the current Arkansas site-specific criteria for minerals (chloride,
sulfate, and total dissolved solids). ADEQ informed the City that the Noland WWTF National Pollutant
Discharge Elimination System (NPDES) permit, currently nearing final publication by ADEQ and was
scheduled for issuance in May 2011, will contain limits on total dissolved solids (TDS), and minerals,
specifically chloride (Cl-), and sulfate (SW). The segment of the White River where the Noland plant
discharges is on the 303(d) impaired streams list for turbidity, TDS, Cl', and SW, Concentrations measured in
the White River exceeded the current site specific water quality standards (WQS) of: Cl' -20 mg/l; SW -20
mg/I; and TDS -160mg/l.
The City undertook the least cost and most common solution, as recommended by ADEQ and successfully
completed by several other Arkansas entities, to make a third party petition to the Arkansas Pollution Control
and Ecology Commission (APCEC) requesting an amendment to Regulation 2 modifying the site specific water
quality standards. We executed an out of scope agreement with CH2M Hill Engineers to be the lead for the
project, supported by FTN Associates. For the last two years, the combined consultant-staff team has
developed the Use Attainability Analysis (UAA), which evaluates aspects of the river with respect to the
designated uses of the stream. The White River has designated uses of aquatic life and drinking water. The
latter has the water quality standards of Cl- - 250 mg/l; SW- 250 mg/l; and TDS -500mg/I. After 18 months
of work, the draft report has been completed and submitted to ADEQ in August 2012. We are now working
with ADEQ to answer questions, develop the final report, and submit our petition to the APCEC. Once the
APCEC makes a determination, it is submitted to the United States Environmental Protection Agency (USEPA)
Region 6 for final approval. The remaining process could take up to 18 months.
Due to circumstances beyond the control of the City and the consultant team, the project has taken longer
and required more work than expected. While the science is relatively definable, the regulatory questions and
actions required to meet the evolving requirements are less easy to define. ADEQ requested additional field
activities beyond the work that had been performed by other requestors performing similar studies.
Additionally, the project was delayed eight months due to the extreme flooding in April and May, 2011, which
hit exactly when we were planning to conduct spring season water quality sampling in the White River. This
amendment covers the work estimated to be required to carry this process through EPA Region 6 approval,
completing the third party rulemaking process. This work includes:
• researching and responding to numerous technical questions from ADEQ and/or EPA
• researching and responding to numerous technical and non-technical questions from the APCEC and
public comments
• attending numerous public and technical calls or meetings with stakeholders, ADEQ, EPA, and APCEC
STAFF REQUESTS THIS BE FORWARDED TO THE CITY COUNCIL.
Agenda Items for Committee Information
W-S-SW CommitteeAgenda 8Janl3
Water,Sewer and Solid Waste Committee Agenda Page 1 of 24
WATER/SEWER/SOLID WASTE COMMITTEE AGENDA
MEETING DATE OF JANUARYS, 2013
3. Capital Prolect Update
Contract Description Contractor Cost Complete
CIPP 2013 Swr Rehab-Cured in Place Pipe_Wide Insituform $ 330,000 0%
265 W/S Relocation & 36"Wtr Line, Hwy 265 _Gamey Const $ 4,989_135 160.09/6 '
Hwy 16 Hwy 16 WaterlSewer Relocations Edwards Const $ 1,589,482_ _ 50%
Hwy112 Garland Ave Water/Sewer Relocations Goodwin & Goodwin $ 1,575,497 909/b
Hwy 265 N Hwy 265 North WaterlSewer Relocations Seven Valleys Const $ _1,368,379 65.1%
Compost Solid Waste Compost Slab, Phase 1 Benchmark Const $ 407,560 _100.0% t
Compost Solid Waste Compost Slab, Phase 2 Benchmark Const $ 335,230 95
Elkins Grav Elkins Gravity Sewer Outfall Line _ Rosetta Const $ 692,223 100.6-0/.—'--
Project is substantially complete, meaning the work can be used to execute its mission.
4. 2013 Utilities Department Action List is attached. This list does not include normal or in-house actions.
5. Change Order 1 with Seven Valleys Construction Co. in the amount of $51,280 for Hwy 265 Water &
Sewer replacements — Joyce to Albright, Bid 12-58, is attached. This project consists of relocating water and
sewer lines as a result of the combined Arkansas Highway Department (AHTD) and City widening of Phase II
of Crossover Road (Hwy 265) between Joyce and Albright. Work includes relocating existing 6-inch to 12-inch
diameter water and sewer lines to a location outside of the new highway right-of-way. Additionally, this work
will complete a water line grid from Joyce Street to the Botanical Garden. The AHTD revised a portion of their
roadway design such that it conflicts with existing water lines that were previously going to remain in place.
The Fayetteville Athletic Club has an existing fire protection water line that is in conflict with the AHTD's
design. Also, we are extending the sewer line on the west side of Hwy 265 approximately 300 feet to provide
sewer service to customers currently on septic systems.
6. Equipment Purchases. Fleet Operations handles equipment purchases for all City departments, and they
are reviewed by the City Council's Equipment Committee. Thus, they are not generally included in W/S/SW
Committee discussions. There are two Utility Department purchases proposed on the January 15 agenda.
A. Round Baler for use in the hay baling operation at the Noland Wastewater Treatment Biosolids
Management. The City used to land apply biosolids on approximately 670 acres east of the White River. The
hay uptakes the phosphorus from the biosolids that were applied to the field. We then sell the hay. This
process is required to continue to lower the phosphorus content in the soil at this site.
B. End-Dump Hauler Trailer for hauling biosolids from both Wastewater Treatment Facilities. These
trailers are used at both WWTFs to receive biosolids from the belt filter presses, and haul it for further
processing. With the biosolids drying facilities having come on line in 2012, biosolids are almost always hauled
to the Noland WWTF drying facilities on the east side of the White River. If there are problems with either the
product or the drying facilities, the product may have to be hauled elsewhere.
7. White River Use Attainability Analysis initial report was submitted to the Arkansas Department of
Environmental Quality (ADEQ) August 27, with a courtesy copy provided to Beaver Water District. The report
identifies that all current designated uses for the White River and Beaver are fully attained, and will continue to
be attainable with site specific minerals criteria proposed in the study, shown below. These proposed criteria
changes would only apply to a specific reach of the White River; there are no proposed changes to any Beaver
Lake criteria. ADEQ comments were received October 22, the City's team responded November 21.
Conversation continues.
Summa-I Existing and Proposed Site-Specific Minerals Criteria for the White River
Mineral Existing Criteria Proposed UAA Criteria Drinking Water Standards
Chloride 20 60 250
Sulfate 20 100 250
TDS 160 440 500
8. Illinois River Phosphorus Evaluation process is continuing, with EPA developing a Total Maximum Daily
Load (TMDL) study for the basin. USEPA hosted a public information session at the Jones Center in
Springdale November 8, providing a project update. The current timeline is below. The intergovernmental
W-S-S W CommittecAgenda 8Jan 13
Water,Sewer and Solid Waste Committee Agenda Page 2 of 24
WATER/SEWER/SOLID WASTE COMMITTEE AGENDA
MEETING DATE OF JANUARY 8, 2013
working group, which consists of the five largest Northwest Arkansas Cities and both counties, is evaluating
hiring a consultant to oversee this portion of the EPA work to ensure the data and assumptions that go into the
model are valid. Simultaneously, conversation between Arkansas, Oklahoma, and EPA Region 6
representatives at ADEQ and ANRC Director level continues.
• Model Calibration Jan/Feb 2013
• Baseline load modeling February/March 2013
• Sensitivity/uncertainty analysis March/April 2013
• Peer review April 2013
• P load reduction scenarios modeling April 2013
• Draft TMDL May 2013
• Public meetings summer 2013
• Final TMDL Fall 2013
9. Lake Sequoyah Dredging Project presentation. Pilot dredging was begun September 12. The lake
contains an estimated 5 billion pounds of sediment that includes over 3.6 million pounds of total phosphorus.
For perspective, the City of Fayetteville's Paul R. Noland Wastewater Treatment Plant is permitted to
discharge 93.4 pounds of phosphorus daily and actually discharges less than 20 pounds per day. At these
discharge rates the lake holds more than 100 years worth of permitted discharge P and over 500 years of
actual discharge P. The sediment removal component of the pilot Lake Sequoyah dredging project was
successfully conducted in late September and early October. Approximately 1.2 million gallons of average
13.7% sediment/slurry was pumped from the lake via a small contracted dredge and split between a geo-textile
bag (geo-tube) and a standard sedimentation basin. While both systems performed well, with approximate
capture efficiencies of over 99.5% for both suspended solids and phosphorus, the sedimentation basin did
consistently out-perform the geo-tube and was operationally much easier. Final thickening/drying results will
not be known for several weeks, but both systems appear to be producing a usable product in a reasonable
time frame. The pilot project removed about 138,000 pounds of sediment including almost 900 pounds of
phosphorus, which is relatively consistent with previously estimated volumes and percentages. Additional
results and recommendations will be forthcoming as the results of this pilot are examined in greater detail and
final drying concentrations are determined in the next few months. A copy of the draft Technical Report is
attached.
10. Water/Sewer/Solid Waste Committee Meets next on Tuesday, February 12, 2013, 5:15 p.m., room 326.
Attachments: 2 Use Attainability Analysis Change Order with CH2M HILL
4 2013 Utilities Department Action List
5 Change Order 1 with Seven Valleys Construction Co.
9 Lake Sequoyah Dredging Project
W-S-S W CommitteeAgenda Uan 13
Water,Sewer and Solid Waste Committee Agenda Page 3 of 24
• CITY COUNCIL AGENDA MEMO
Fa
�Te eel le MEETING DATE OF FEBRUARY 7,2013
i THE CITY OF FAYETTEVILLE,ARKANSAS
ARKANSAS
To: Fayetteville City Council
Thru: Mayor Lioneld Jordan
Don Marr, Chief orStaff
i
From: David Jurgens, Utilities Director
Fayetteville Water and Sewer Conunitec
Date: January 4, 2013
Subject: Out of Scope Agreement Amendment, CH2M Hill Engineers, White River Use Attainability Analysis
RECOMMENDATION
Staff recommends approving Amendment 1 to the Out of Scope Agreement with CH2M Hill Engineers, Inc. for
$154,550 to continue work on the Use Attainability Analysis (UAA) for the White River, maintaining the existing
approved $50,000 contingency, and approve a budget adjustment.
BACKGROUND
ADEQ informed the City that the Noland WWTF National Pollutant Discharge Elimination System(NPDES) permit,
currently nearing final publication by ADEQ and was scheduled for issuance in May 2011, will contain limits on total
dissolved solids (TDS), and minerals, specifically chloride(Cl"), and sulfate(SO4-). The segment of the White River
where the Noland plant discharges is on the 303(d) impaired streams list for turbidity,TDS, Cf, and SO4_-
Concentrations
04 .Concentrations measured in the White River exceeded the current site specific water quality standards(WQS) of Cl" -20
Mg/l; SW -20 mg/1; and TDS -I60mg/l.
The City undertook the least cost and most common solution, as recommended by ADEQ and successfully completed by
several other Arkansas entities,to make a third party petition to the Arkansas Pollution Control and Ecology
Commission (APCEC)requesting an amendment to Regulation 2 modifying the site specific water quality standards.
We executed an out of scope agreement with CH2M Hill Engineers to be the lead for the project, supported by FTN
Associates. For the last two years, the combined consultant-staff team has developed the Use Attainability Analysis
(UAA), which evaluates aspects of the river with respect to the designated uses of the stream. The White River has
designated uses of aquatic life and drinking water. The latter has the water quality standards of Cl' - 250 mg/1; SO4 - 250
mg/l; and TDS - 500mg/l. After 18 months of work, the draft report has been completed and submitted to ADEQ in
August 2012. We are now working with ADEQ to answer questions, develop the final report, and submit our petition to
the APCEC. Once the APCEC makes a determination, it is submitted to the United States Environmental Protection
Agency(USEPA) Region 6 for final approval. The remaining process could take up to 18 months.
DISCUSSION
Due to circumstances beyond the control of the City and the consultant team, the project has taken longer and required
more work than expected. While the science is relatively definable, the regulatory questions and actions required to meet
the evolving requirements are less easy to define. ADEQ requested additional field activities beyond the work that had
been performed by other requestors performing similar studies. Additionally, the project was delayed eight months due
to the extreme flooding in April and May, 2011, which hit exactly when we were planning to conduct spring season
water quality sampling in the White River. This amendment covers the work estimated to be required to carry this
process through EPA Region 6 approval, completing the third party rulemaking process. This work includes:
• researching and responding to numerous technical questions from ADEQ and/or EPA
• researching and responding to numerous technical and non-technical questions from the APCEC and public
comments
Noland NPDES OMI OOS Cot CCMernohn12
Water,Sewer and Solid Waste Committee Agenda Page 4 of 24
• attending numerous public and technical calls or meetings with stakeholders, ADEQ, EPA, and APCEC
BUDGETIMPACT
$67,400 is available in this project; the remaining $137,150 is proposed to be moved from Wastewater Treatment/Water
Quality Improvements project 13018, established to provide additional funding for this and other related projects,
City of Fayetteville 113 West Mountain Fayetteville,Arkansas 72701479-575-8330,fax 479-575-8257
NolardWDESOMIOOSCOI CCMemDJml2
Water,Sewer and Solid Waste Committee Agenda Page 5 of 24
January 4, 2013
Mr. David Jurgen
City of Fayetteville
113 West Mountain Street
Fayetteville, AR 72701
Subject: Out of Scope Letter Agreement Revisions
Dear David:
Previously, we agreed to have CH2M HILL Engineers, Inc. (CH2M HILL) provide
certain Out of Scope services in a letter dated March 4, 2011 and as per the Operations,
Maintenance and Management Agreement dated December 15, 2009, executed between
the Parties. Under that Out of Scope Letter dated March 4, 2011, the parties needed to
agree in writing when CH2M HILL had revisions to the approved ADEQ work plan or
to the price.
CH2M HILL respectfully requests a change order in the amount of $154,550 for the
completion of the Use Attainability Analysis (UAA) on the White River segment that
the City of Fayetteville's Paul R. Noland Wastewater Treatment Plant (WWTP)
discharges into. The UAA addresses the current Arkansas site-specific criteria for
minerals (chloride, sulfate, and total dissolved solids).
The field studies and data collection outlined in the agency approved UAA Study Plan,
dated May 2011, have been completed. The UAA draft report was submitted to the
Arkansas Department of Environmental Quality (ADEQ) on August 27, 2012. The City
received written comments from ADEQ on October 22, 2012. The City provided ADEQ
an initial response to comments on November 21, 2012; however, additional work is
required to complete the UAA process as outlined below.
Final report review and preparation of the response to the October 22, 2012 comments
submitted by ADEQ is anticipated to require additional work estimated to cost $62,550
(see Task 1 below). Work associated with the third-party rulemaking process was not
included in the original UAA scope of work or cost estimate, but it has been included
below under Tasks 2 and 3. The level of effort anticipated to provide technical support
during the third-party rulemaking process is estimated to be $92,000 (see Tasks 2 and 3
below).
Task 1: Address ADEQ comments on the UAA and revise the report for ADEQ
approval.
Water,Sewer and Solid Waste Committee Agenda Page 6 of 24
Estimate to complete task: $62,550
Key assumptions and caveats:
• Assumes currently anticipated review of report will be adequate to support future
activities
• Assumes up to three (3) one-hour internal team conference calls pertaining to
technical issues.
• Assumes up to three (3) one-hour internal team conference calls pertaining to
regulatory/policy strategy issues.
• Assumes up to two (2) one-hour conference calls with ADEQ pertaining to technical
issues.
• Assumes up to two (2) meetings with ADEQ pertaining to regulatory/policy
strategy issues.
• Assumes the extent of ADEQ comments to be addressed under this task will be
limited to those dated October 22, 2012.
• Assumes no additional field sampling or data collection will be required.
• Assumes technical analyses pertaining to nutrient enrichment will not be required.
• Clearance to proceed with the third-party rulemaking petition requires approval of
the UAA by ADEQ, which is anticipated but cannot be guaranteed.
Task 2: Address potential EPA and stakeholder comments prior to initiation of the
third-party rulemaking process.
Estimate to complete task: $32,000
Key assumptions and caveats:
• Significant comments from EPA are not anticipated until their formal, 90-day review
period begins after final approval of the proposed rulemaking by APCEC (see Task
3).
• The cost estimate for Task 2 does not include addressing EPA comments that may
originate during their formal, 90-day review period; those comments will be
addressed under Task 3.
• Assumes no additional analyses or significant report amendments will be required
to address the findings of the USGS report pertaining to the Beaver Lake water
quality model when it is published by the USGS.
• Assumes up to two (2) one-hour internal team conference calls for planning and
coordination.
• Assumes up to two (2) conference calls with EPA, of which one (1) will be a
teleconference from the ADEQ headquarters building.
• Assumes up to two (2) conference calls and one (1) meeting with stakeholders.
• Assumes up to two (2) conference calls with ADEQ to maintain coordination with
the lead agency.
• Assumes limited revisions to the report may be required under this task, but no
reproduction of report hardcopies.
Water,Sewer and Solid Waste Committee Agenda Page 7 of 24
Task 3: Initiate and complete the third-party rulemaking process.
Estimate to complete task: $60,000
Key assumptions and caveats:
• Assumes up to two (2) one-hour internal team conference calls for planning and
coordination.
• Assumes participation of two (2) technical staff in five (5) meetings: the initial
APCEC meeting (initiation of rulemaking); one public hearing; two legislative
committee hearings; and the final APCEC meeting.
• Assumes up to two (2) conference calls with stakeholders.
• Assumes up to two (2) conference calls with EPA, of which one (1) will be
teleconference from the ADEQ headquarters building.
• Assumes up to two (2) conference calls with ADEQ to maintain coordination with
the lead agency.
• Assumes all written technical clarification will be transmitted via technical
memorandums and no revisions or reproduction of the UAA report {as developer{
under Tasks 1 and 2) will be required.
When it is being provided: Services are expected to be initiated in January 2013
by first meeting with ADEQ to discuss the comments
they provided on October 22, 2012. It is possible that
such a meeting could occur in December 2012, but it is
not anticipated given the approaching holidays. The
initial goal is to obtain ADEQ approval of the
minerals UAA with clearance to proceed with the
Third-Party Rulemaking. If approval were granted in
March 2013, it is estimated that the rulemaking
process would be complete during the first quarter of
2014. Refer to Attachment 1 for an outline of the
estimated schedule for Third-Party Rulemaking.
Price of services: To be billed at CH2M HILL'S actual cost plus 18% as
per Section 3.2 and Appendix C.1.25 of our
Agreement upon completion of the services.
Documentation of actual costs shall be provided with
invoices.
Increased Estimate of costs: Estimated at approximately $154,550*
Payment terns: Due upon receipt of CH2M HILL'S invoice and
payable within thirty (30) calendar days as per
Section 5.2 of our Agreement.
*Note that the City will be alerted immediately if ADEQ requires work beyond the
scope outlined above or other circumstances cause the estimated costs of the project to
Water,Sewer and Solid Waste Committee Agenda Page 8 of 24
exceed this number. No work will be performed above this price until such work is
approved in writing by the City.
All other terms and conditions of the Agreement dated December 15, 2009, as amended
November 16, 2010, and November 15, 2011,between CH2M HILL and The City of
Fayetteville remain in full force and effect.
If these terms are agreeable to you, please sign both copies of this letter. We will return
one fully executed original for your files.
CH2M HILL appreciates the opportunity to provide these additional services to the
City of Fayetteville.
Sincerely,
Duyen Tran
Project Manager
Both parties indicate their approval of the above-described services by their signature
below.
Authorized CH2M HILL: Authorized City of Fayetteville, Arkansas
Name: Natalie L. Eldredge Name: Lioneld Jordan
Senior Vice President Title: Mayor
Date: Date:
Water,Sewer and Solid Waste Committee Agenda Page 9 of 24
THE CITY OF FAYETTEVILLE,ARKANSAS
a e evl le UTILITI13West1flTMENT
Z T 113 West Mountain
(�fy) Fayetteville,AR 72701
P14Y91575-8330 F(4791575-8257
Afl KANSAS
To: Record
From: David Jurgens, Utilities Director I,A,v
Date: January 4, 2013
Subject: Utilities Department Action List for 2013
The following major actions are anticipated to be worked on by the Utility Department in 2013.
A. Construction Projects:
• Entertainment District Parking Deck
• Utilities Relocations for AHTD/City Street Projects:
- Highway 112/Garland, North Street to Melmar(AHTD) (construction underway)
- Highway 265/Crossover, Joyce to City Limits (AHTD) (construction underway)
- Highway 16/Huntsville/Happy Hollow from Armstrong to Stonebridge (construction underway)
- Highway 16/Huntsville Bridge Across the White River (design underway)
- Cato Springs Road (construction underway)
- Van Asche—Highway 112/Garland to Gregg Avenue
- Rupple Road—Martin Luther King to Persimmon Street
• Sanitary Sewer Rehabilitation - South Fayetteville and Greenland Area(multiple contracts)
• Lake Sequoyah Dredging
• Solid Waste Stormwater Protection/Composting Concrete Slab (construction underway)
• Mt. Sequoyah Area Water and Sewer Lines (second phase- possible project, being evaluated)
• Disinfection System-Noland WWTF
• Water Transmission Line easement definition and acquisition (Underway)
• Irrigation Reel Replacement Purchase
• Benson Mountain Water Tank replacement
• 24d' Street/South Mountain Pump Station Renovation
• Miscellaneous water/sewer cost shares and In-House Projects
B. Contracts and Agreements:
• West Fork Wastewater Contract
• University of Arkansas Farm Water/Sewer Service
• Washington Plaza Water System Conversion
• Elkins Water Contract Extension
• Possible Greenland sewer system acquisition
• Possible Farmington sewer system acquisition
C. Plans, Studies, Engineering, Program Changes:
• Stormwater Feasibility Study
• Wastewater Master Facilities Plan and Model Update
• Solid Waste Rate Study
Page I of 2
Utilities Dept 2013 Project List
Water,Sewer and Solid Waste Committee Agenda Page 10 of 24
• Water/Sewer Rate Study
• Wetlands Bank Expansion
D. Regulatory/Ordinance Related Actions:
• West Side WWTF National Pollutant Discharge Elimination System (NPDES) permit renewal (Illinois
River Basin)
• Noland WWTF NPDES permit renewal (White River Basin)
• White River NPDES Use Attainability Analysis and APCEC Stream Standards Third Party Rule Making
- CH2M Hill Out of Scope Agreement for UAA
- Mitchell, Williams Environmental Attorney Support for APCEC Petition
- USGS modeling of upper end of Beaver Reservoir
• Illinois River Total Maximum Daily Load (TMDL) Overwatch (with NWARP Intergovernmental
Working Group)
• Insurance Services Office Inc. (ISO) Fire Rating Evaluation
• Sewer Use Ordinance (Major update, addition of Fats, Oils, and Grease section)
• Water ordinance, (Major update, update of backflow prevention section)
• Swimming Pool maintenance BMPs and related ordinance revisions.
Page 2 of 2
Utilities Dept 2013 Project List
Water,Sewer and Solid Waste Committee Agenda Page 11 of 24
Ile
CONTRACT REVIEWMEMO
jre MAYOR'S APPROVAL
Y THE CITY OF FAYETTEVILLE,ARKANSAS
IMINA NSAS
To: Mayor Lioneld Jordan
Thru: Fayetteville Water and Sewer Col iittee
David Jurgens, Utilities Director lUl
Don Marr, Chief of Staff
From: Shannon Jones, Utilities Engineer (
Date: December 17, 2012
Subject: Approval of Change Order 1 with Seven Valleys Construction Co. in the amount of$51,280 for Hwy.
265 Water& Sewer replacements -Joyce to Albright, Bid 12-58.
RECOMMENDATION
Staff recommends approval of Change Order 1 with Seven Valleys Construction Co. in the amount of$51,280
for Hwy. 265 Water&Sewer replacements- Joyce to Albright, Bid 12-58.
BACKGROUND
This project consists of relocating water and sewer lines as a result of the combined Arkansas Highway
Department(AHTD) and City widening of Phase II of Crossover Road (Hwy 265) between Joyce and Albright.
Work includes relocating existing 6-inch to 12-inch diameter water and sewer lines to a location outside of the
new highway right-of-way. Additionally, this work will complete a water line grid from Joyce Street to the
Botanical Garden.
DISCUSSION
The AHTD revised a portion of their roadway design such that it conflicts with existing water lines that were
previously going to remain in place. The Fayetteville Athletic Club has an existing fire protection water line
that is in conflict with the AHTD's design. Also, we are extending the sewer line on the west side of Hwy 265
approximately 300 feet to provide sewer service to customers currently on septic systems.
BUDGETIMPACT
Funds are available within the project contingency. The AHTD will reimburse the City approximately$12,450
for the relocations. After reimbursement, approximately $23,720 will remain in contingency after the change
order is approved.
Telecommunications Device for the Deaf TDD(479)521-1316 113 West Mountain-Fayetteville,AR 72701
Seven Valleys CCMemo 12-17-2012.dec
Water,Sewer and Solid Waste Committee Agenda Page 12 of 24
ye evale
Change Order Nu Page I of I
CONTRACT CHANGE ORDER COyContracW 226 Schedule
City Resolution It 171-12 Date 12/7/2012
Vit,Prulect No.: 08072.1102
Prgjccl Namc. Highway 265 Wa10&$ewer Upl.mcam¢,Nhnsc l Location: I'it)cIt c.Arkansas _
Owner: City of-Fayetteville Conninin ; Seven Volley'•Cunslruution Cu.. Inc.
Address: 113 West Mountain Addresv. PO Rux RR
faycttev111c,AR 72701 T ('n.sAllc.NO 65625
ME FOLLOWING CIiANOLS ARE HIIICEHY AMI`.NDI;D IN'10'1 f Ili CON'I'RAC CI11I,ANS AND ti_N_E_CIFICAI'fONS:
II EM N DESCRIPTION DE WASIi _ INCRFASIi
1 Add Water and Sewer Facilities per Attached Ilrcakdown $51,280
-_ - I DIAL DECRCASF AMOtIN I $0,00 --_- —
'I'Ol AI.INCRFASF AMOt1NI 751.280.00
N_ET UHANOF ORDkIL $51,2&0.00
IiNGINLRRS FINAL
CHANGETO CON111ACT AMOUN T: LOI'ALAMOUNT ISI.IGIUI.F AMOUNT
Original Contract Amount $1
—368,379.0 $ 368,379M
Total Previous Change Order(s) ELL $0.()0
Net Amount'I his Change Order $11,28U.0 $'53-80.00
TOIALCON"IRACPAMOUN'I TODAT1, S 1,419,09.0 $1119,659.00
GRANGE TO(:ON'I RA(T(Y)MPI,F.PION DA'1'I?
Original Completion Time 180 Dues(March If.2013)
Previous Adjusted� Completion"rime N/A
(l ncrcase)fAeeFease) I his Change Order I S Days Calendar Days
NI W(t) J I1 A("T C'MNIUFI I ON DA I I_ March 26,2013
Itli(OMMF.NDED: MCCLI:LLAND CONSULTING LNUIN'FaiRLINC.
7Engineer
l l Y: Yv�it _ L�{,�.-E<F _ 171 6 ry I Z.
tiu;nulurc —� Tit lc Date
A( (l'.I'll 1): SFVFN VALLEY'S CON.4'IRUCIION CO.INC:
CJuulraclnr --
11V:
rgnnuve title Ualc
A1TROVI'D. CITY 01' FAYL ITLVILI.1;
Owner
-
-- I ills Uutc
Si annune
Water,Sewer and Solid Waste Committee Agenda Page 13 of 24
ATTACI iMENT TO CHANGE ORDER#I
HIGHWAY 265,PHASE ll
AHTD Job 040518
MCE Job# FYI 12118
Water and Sewer System Change Order Work for
Fire Line Connection at Fayetteville Athletic Club,
Water Service Line Crossing at Sta. 157+20
and Sewer Line No.5
A. Fire Line Connection at Fayetteville Athletic Club Sta. 161+38,83' l,t
Bid Item Estimated
# _ _ -_ Description _ Quantity Units Bid Price _ _ Extended
5 6-inch Ductile Iron Pipe 20 FT $55.00 $1,100.00
17 6"x 6"Tapping Sleeve&Valve I EA $2,200.00 $2,200.00
20 Abandon Existing Valve I EA $100.00 $100.00
21 Epoxy Lined Ductile Iron Fittings 167 LB $7.00 $t,169.00
45 Cut and Cap Existing 6-Inch Main I EA $1,100.00 $1,100.00
76 Concrete Surface Restoration 7 SY $51.00 $357.00
79 Granular Fill 15 TON $16.00 $240.00
Estimated Total $6,266.00
Existing Facilities Begin Abandoned at Fayetteville Athletic Club
Item Ouantih'Off Old R/W -Qualttity On Old K/W
6-Inch Pipe 10 Ft
6-Inch Valve l Ea .--
B. Water Service Crossing at Sta. 157+20 to Existing Water Meter at 135 ft Rt
Bid Item Estimated
# Description _ Quantity Units Did Price Extended
7 1-Inch Polyethylene Service Tubing 215 FT $15.00 $3,225.00
28 Service Line Connection to Existing Meter 1 EA $200.00 $200.00
31 12-Inch Saddle, 1-Inch Tap I EA $200.00 $200.00
76 Concrete Surface Restoration 7 SY $51.00 $357.00
78 Curb and Gutter Restoration 10 LF $20.00 $200.00
79 Granular Fill 17 TON $16.00 $272.00
N/A 11/2-Inch Bored Polyethylene Casing 100 FT $52.00 $5,200.00
N/A 1 1/2-Inch Direct Bury Polyethylene Casing 74 FT $20.00 $ 480.00
Estimated Total $11,134.00
Existing Facilities Being Abandoned at Water Service Crossing
Item Quantity Off Old R/W -_Quantity OnOld R/W
Wrich Service Crossing 100 Ft 80 Ft
Connect to Existing Meter Setting I Ea 0 Ea
FYI 121 I8 Change Order#I Page I
Water,Sewer and Solid Waste Committee Agenda Page 14 of 24
C. Sewer Line#5
Bid Item Estimated
# Description Quantity Units Bid Price Extended
47 8-Inch PVC Sewer Main 299 FT $30 $8,970
48 44nch PVC Sewer Service 4 FT $25 $100
50 Sewer Trench,6'- l0'Deep 299 FT $20 $5,980
52 4 Foot Diameter Standard Manhole 4 EA $2,400 $9,600
53 Extra Manhole Depth,Over 6'Deep 13 FT $150 $1,950
60 4-Inch Manhole Tap for Sewer Service 1 EA $600 $600
64 Connect Sewer to Existing Manhole 3 EA $1,000 $3,000
74 Asphalt Surface Restoration 4.5 SY $100 $450
79 Granular Fill 30 TONS $16 $480
N/A Tree Removal l EA $1000 $1,000
N/A Rock Excavation 10 CY $175 $1.750
Estimated Total $33,880
Total Change Order Estimated Value
Description Estimated Total
A. Fire Line Connection at Fayetteville Athletic Club $6,266.00
B. Water Service Crossing at Sta. 157+50 $11,134.00
C. Sewer Line#5 $33,880.00
Change Order#l Estimated Total $51,280.00
Original Contract Amount $1.368.379.00
Revised Contract Amount with Change Order#1 $1,419,659.00
Note: Items A and B are eligible for reimbursement from the Highway Department. Item C,
Sewer Line#5, is a new line and is not eligible for reimbursement by AHTD.
Water,Sewer and Solid Waste Committee Agenda Page 15 of 24
Lake Sequoyah Pilot Dredging Report
6608 E. Lake Sequoyah Dr
Fayetteville, AR 72701
Purpose
Dredging Lake Sequoyah would
effectively re-establish the lake as a lake SapuoYuh Watura Sudimuntolumn Wuurumunu
sediment catchment and recreational amvwv..dn„,
resource,allowing thousands of tons of
future sediment to be captured,thus --
helping to protect Beaver Lake water
quality. This pilot removed a small — - -
portion of sediment via a floating z
dredge to compare Geo-tube and
settling basin results, enable sampling 8
of a much larger cross-section of lake
sediment than was possible previously,
and to provide other information that
could be used to determine future
large scale lake dredging options. It is
estimated that the lake contains almost
5 billion pounds of sediment that
includes over 3.6 million pounds of total phosphorus. For perspective,the City of Fayetteville's Paul R.
Noland wastewater treatment plant(Noland WWTP) is permitted to discharge 93.4 pounds of
phosphorus daily and actually discharges less than 20 pounds per day. At these discharge rates the lake
holds more than 100 years worth of permitted discharge P and over 500 years of actual discharge.
Dredged Sediment Removed
Approximately 500 cubic yards of de-watered sediment were removed from the headwaters of Lake
Sequoyah about Y4 miles downstream from where the East Fork& Middle Fork of the White River enters
the lake. Removing 500 cubic yards required one small path<200-ft long x 8-ft wide. Sediment depth
for this path was more than 4 ft deep and appeared to be consistent with preliminary coring efforts and
was thus determined to be representative of the lake in general. Dredged material was 5-10%solids as
pumped from the lake and was 56%organic and 44%inorganic. As determined by a depth finder,the
water column was 2-3 ft deep before or in front of the dredge, and 4-5 ft deep after the dredge passed.
As sediment was removed surrounding areas sloped inward to fill the void created by the removed
sediment. Approximately 1,200,000 gallons of sediment slurry was pumped from the lake to capture
the 500 cubic yards of sediment. Interestingly,the settling basin appeared to capture more sediment
^300-cu/yds) and required less total gallons (500,000) due to apparent increased capture effectiveness.
Sediment Dewatering Methods
Two dewatering methods were used for the pilot project. A long geo-textile bag called a "Geo-tube":
45-ft circumference x 57-ft long with a fill height of 7-ft tall and a capacity of up to 205 cubic yards of
material or 91,000 gallons was one method. The second method utilized a simple 75-ft wide x 100-ft
long x 6-ft deep settling basin with inward sloping walls and capacity up to 250,000 gallons or 1,500
cubic yards of material. Polymer was added in various dosage rates to the slurry introduced into both
types of dewatering systems. For this project, about 70 gallons of Drewfloc 2410 Polymer from
Ashland®was used as a flocculant.
Water,Sewer and Solid Waste Committee Agenda Page 16 of 24
*geo-tube was set inside 100 ft wide x 100 ft long area, with a 25 ft wide x 6-ft deep trench dug around
bag for drainage/water collection area.Also, the bag was laid on 6"of gravel to allow drainage from
bottom of bag and leveling of bag.
TM �
Equipment&Staff Needed for Settling Basin
Using the settling basin for sediment dewatering required 4 Personnel: 1 dredge operator, 1 shore
operator, 1 polymer calibration operator, and 1 work hand. Equipment included:
"6 x 4 Dredge"—6" outlet with 4" intake with a pumping capability of 400 gpm
60 hp Caterpillar bulldozer for dirt work the first day
Bobcat skid-steer loader for small jobs throughout set-up phase
2 work/travel boats for getting to/from dredge
300-ft of 4" hose from dredge to flow splitter device
30-ft of 4" hose from splitter to geo-tube
30-ft of 4" hose from splitter to settling basin
12 2-ft buoys to float dredge hose
Y/Splitter—polymer injection and valves to split the flow between the geo-tube and the settling basin
70 gallons of Drewfloc 2410 Polymer from Ashland® & drum dolly(approximately 40%to settling basin
and 60%to geo-tube)
Polymer mix chamber&discharge: water intake up to 100 gpm, polymer intake up to 2 gpm
Water,Sewer and Solid Waste Committee Agenda Page 17 of 24
10-ft of 1" chemical hose for polymer
injection from pump to splitter
25-ft x 1,200-ft roll of 60-mm liner
80 5-lbs sandbags to weigh down liner
Generator for polymer mixer& pump, and
liner welder
Small 60-gpm pump for polymer dilution
water
50-ft of 1.5" hose for polymer dilution water
Small 500-gpm trash pump to pump out
containment basin effluent
100-ft of 4" hose from trash pump to lake
Latex gloves, paper towels, duct tape, &
various hand tools (screwdrivers,wrenches)
Equipment&Staff Needed for Geo-tube-All equipment and staff for Settling Basin and:
32-cu/yds(40 tons)of gravel (3/4" Limestone Aggregate)
45-ft circumference x 57-ft long TenCate® Geo-tube
Pole/Measure stick for measuring geo-tube height
Set-up 09/04 start-09/11
I. Project started with dirt work using a bulldozer to build containment areas for geo-tube &settling
basin. Less than 8 hours of work with the bulldozer were required to build both containment basins.
Both basins were lined with 60-mm thick polypropylene material that came on a 25-ft wide roll. 150-ft
lengths were cut and moved into position with the Bobcat. The liner welder,essentially a hot press
operating at 700 degrees, was used to weld/seal liner sheets to one another.This process was fairly slow
and Sludge Technology, Inc®,the sub-contractor who performed the dredging work, was not familiar
with the welding equipment. Liner welding therefore required 1.5 days to complete. -80 sand bags were
used to keep the liner weighted down to prevent wind from blowing the material around. Welder issues
a few times melted holes through the liner, which were patched with silicone. Once the liner was
constructed some of the berm dirt was laid over all edges/border to provide a more secure wind barrier.
6" of gravel was laid for geo-tube to lie on, to level the geo-tube and to allow water to escape from the
lower portion of the tube.
II.The dredge was placed into the lake, and then
navigated to the intended start area.This small
dredge required less than 2-ft of water depth,
while a larger or`full-size' dredge might require
as much as 6-ft of water depth. Once the dredge
was in place, the hoses were attached.A long
flexible hose ran from the pump discharge to the
h bank and allowed free movement of dredge
without concern of hose pinches or kinks. Buoys
were attached to the hose periodically to keep
hose(once full) on the water surface and not
dragging through sediment. Acable was
Water,Sewer and Solid Waste Committee Agenda Page 18 of 24
attached from the dredge to a secure location on shore (tree). Beginning the dredging process far off
from shore, a winch on the dredge used this cable to pull the dredge through the sediment toward
shore while dredging. Work boat(s) allow staff to traffic to and from dredge.The dredge stayed in the
lake 24/7 so caution signs were posted due to 'hanging cable'.
III. Pipe coming from dredge came W&
inland and connected to a flow
splitter device directly before feeding
geo-tube/settling basin.The splitter
also had an injection port for polymer
feed,which was mixed/diluted just -
upstream. Another small 60-gpm :,• ^! ; • 'r =;�
pump pumped lake water to polymer y
mix system while polymer -
concentrate was added.This polymer
was pumped about 5 ft to the
injection point of the splitter.
Injection of polymer was about 30-ft
ahead of either the Geo-tube or
settling basin.The splitter provided
the capability to divide the flow to
geo-tube and/or settling basin as needed. At start-up or times of polymer calibration all flow was sent
to the settling basin since operation of the settling basin was more flexible. Once polymer dosing was
dialed in all flow was sent to geo-tube or split between settling basin &geo-tube.
Dredging Activity Dates: 09/12, 09/13,09/19, & 10/01
I. After set-up was completed, polymer system started and a good polymer mixture was obtained then
dredging started. Polymer dose calibration was checked frequently(every 5-10 minutes) at splitter from
a spout located 2-ft downstream of the polymer injection point.With variations in sediment depth and
slurry consistency polymer adjustments were needed frequently.
Once polymer dose was correct all flow was sent to fill geo-tube.At times, when polymer dose needed
adjustment,flow was diverted to settling basin until corrected. Also, once the geo-tube was almost full
flow was split between both settling basin &geo-tube. Once the geo-tube was at fill-point flow was sent
to settling basin until half full.The geo-tube was allowed to dewater overnight and filled again the next
day. Day one the settling basin was left at half full to allow room for the next day's pumping into the
geo-tube (start-up polymer adjustment).
II. Too much polymer/polymer overdosing would blind the pores of the geo-tube, so it was important
to have polymer dose correct before sending flow to the geo-tube. In the same sense, insufficient
polymer dosing allowed loose sediment particulate to blind the geo-tube also. Even with the correct
polymer dose, some sediment still tends to blind the geo-tube. Sludge Technology, Inc®employees
would slap the bag by hand to clear pores; also they would walk on top of the bag. Although the method
of walking on top of bag did seem as if it could be unsafe, it worked extremely well to significantly
increase the rate of dewatering. At times of very little dewatering,walking across the top of the geo-
tube dramatically increased the rate of water being discharged.
Another note here is that the TenCate®geo-tube used in this pilot could withstand a tremendous
amount of pressure. Not only did workers walk on the geo-tube but on day one the bag was very likely
Water,Sewer and Solid Waste Committee Agenda Page 19 of 24
overfilled.The geo-tube was completely full and still being pumped into, not draining, and a 'I onto`"
worker still got on top and walked the geo-tube relieving a huge amount pressure and allowing a large
volume of separated water to move to the storage area.
r�— -
Ai. -4, -I
W1
[�I I
lI
-
III. Day one the geo-tube was filled to 7-ft and dewatered overnight to 1-ft; settling basin was filled to
50% (-3-ft deep) and dewatered overnight to <0.75 ft of solids. Effluent samples were collected from
both systems (see Effluent Sample Results)
Day two the geo-tube was filled to 7-ft and dewatered to 2-ft; settling basin was filled to 75%(added 2
ft) and dewatered to<1%-ft of thickened solids. Effluent samples were again collected (see Effluent
Sample Results)
Between day two and day three both containment basins were mostly full with filtrate/separated water
and were pumped back to lake (after sample analysis proved effluent acceptable to discharge). About
1.5' of sediment and some water was left in settling basin.
Day three the polymer container was emptied once the geo-tube was filled so the settling basin was
filled another 4-ft without polymer.
Day three after geo-tube was filled to 7-ft and dewatered to 3-ft, the settling basin was filled again (no
polymer added) and dewatered to <2Y,-ft of thickened solids, which concluded pumping to the settling
basin. Effluent samples were collected (see Effluent Sample Results)
Between day three and day four both containment basins were mostly full with filtrate/separated water
and were pumped back to the lake (after sample analysis proved effluent acceptable to discharge).
Water,Sewer and Solid Waste Committee Agenda Page 20 of 24
Collected Settling Basin effluent sample to show concentrations after of 12 days settling(see Effluent
Sample Results)
Day Four the geo-tube was filled &dewatered twice. After the geo-tube dewatered to 4.5-ft, discharge
samples were collected once more(see Effluent Sample Results)
No noticeable odors from the dredged material were detected by any staff during any of the dredging.
Untreated Slurry/Dredge Material Sample Results
091912 Slurry: TSS 137,900 mg/L T-phosphorus 87.0 mg/L
Lake Water,top 6"of water, south end of lake^200-ft from dredge
091912 Lake Water: TS5 43 mg/L T-phosphorus 0.15 mg/L
Effluent Sample Results
091212 Geo-tube: TSS 246 mg/L T-phosphorus 0.46 mg/L
091212 Settling Basin: TSS 143 mg/L T-phosphorus 0.28 mg/L
091312 Geo-tube: TSS 154 mg/L T-phosphorus 0.26 mg/L
091312 Settling Basin: TSS 116 mg/L T-phosphorus 0.17 mg/L
091912 Geo-tube: TSS 49 mg/L T-phosphorus 0.10 mg/L—ideal polymer dosing
091912 Settling Basin: TSS 27 mg/L T-phosphorus 0.08 mg/L—ideal polymer dosing
100112 Geo-tube: TSS 900 mg/L T-phosphorus 1.24 mg/L—poor polymer dosing
100112 Settling Basin: TSS 110 mg/L T-phosphorus 0.59 mg/L—no polymer, 12 days settling
Sediment Sample Results
Geo-tube: Potassium 470 mg/kg T-phosphorus 70.7 mg/kg T-Nitrogen 544 mg/kg
Settling Basin: Potassium 421 mg/kg T-phosphorus 69.8 mg/kg T-Nitrogen 298 mg/kg
Visitors
Sara Wrede: City of Fayetteville Engineer
She visited and gave the impression that she viewed the geo-tube as the working version due to
weather element& drying ability.
Lynn Hyke: City of Fayetteville Construction and Contract Manager
Lynn does have previous subcontract work experience with Sludge Technology, Inc®and did not seem
impressed with their previous work.
David Hook—City of Rogers Dept. of Planning&Transportation Facilities Development Manager
He was interested to see a dredge project similar to a potential project for the City of Rogers. He was
also interested in Sludge Technology, Inc® regarding their potential interest/capabilities for his project.
Summary
In general,the pilot project accomplished the intended goals of evaluating a larger cross-section of the
contained sediment as well as the two most probable sediment de-watering methods. While there were
certainly many issues encountered that had to be addressed for the pilot project and will be even more
important for the full-scale operation, it seems obvious that the sediment can be removed,that the
sediment does not appear to contain harmful levels of any anticipated pollutant,and that even though
either de-watering method would work the sediment basin system will likely prove to be more effective
both from a cost and operational perspective.
Water,Sewer and Solid Waste Committee Agenda Page 21 of 24
Issues Encountered
1. Polymer Dose Inconsistencies. The concentration of the sediment slurry changed with depths and
variances of water intake, making polymer dosing and calibration very hard to manage. Ideally,there
would have been a tank in-line to provide a small equalization area to help make solids pumping more
consistent. Dredge material might be pumped to—5,000 gal mixing tank,then pumped or allowed to
flow by gravity from tank(with in-line polymer injection) to settling basin so the solids/polymer mixture
would be more consistent.
Nicole (a sales rep from Ashland who supplied the polymer)was onsite and adjusted/calibrated all
polymer feeds the first two days of dredging,which was very good. With the other two days dredging
experience Sludge Technology, Inc® proved they could not perform the polymer adjustments as well.
2. Geo-tube Blinding. A necessary technique to unclog geo-tube was to slap sides of bag and unclog
pores and another technique used was to walk on top of the bag and unclog pores. This was necessary
to keep the geo-tube draining and to prevent building up excessive pressure. A better/safer technique
would need to be developed to un-blind geo-tube such as using a pressure hose from a distance.
3. Polymer over-use. The total amount of polymer used for the pilot was 3X's what was initially
estimated by Ashland®. (Estimated use was 20-gal, required use was 70-gal.) Some of the over-use was
due to Sludge Technology, Inc's lack of polymer experience, but even the Ashland® representative
needed to use more polymer than originally estimated. One theory regarding this issue was that the lake
water used for dilution of the polymer contained some organics which prematurely reacted with the
polymer and prevented optimal dosing from occurring. CH2M Hill purchased another$900 drum of
polymer to complete the project.
Lessons Learned &Suggestions
1. Settling Basin effluent(water going back to Lake) always had better results than Geo-tube.
2. Settling Basin required a lower polymer dose than the geo-tube, and would likely even require less
still if more time were allowed for settling. Geo-tube required same ratio of polymer to slurry%
solids as not to blind bag. Polymer was$22 per gal.
3. Settling Basin containment only required gravity&time so more sediment stayed in basin.
4. Geo-tube being filled built pressure and the higher pressure pushed more sediment out of the bag.
5. Settling Basin had more room for error if polymer system malfunctioned.
6. Geo-tubes cannot be reused and are normally landfilled after one use.Settling Basin(s) can be
reused with minimal effort. Geo-tube is roughly$11 per cubic yard of sediment removed (based on
TenCate®geo-tube cost).
7. Product visibility is low in both dewatering methods and frequent spot-checks at polymer injection is
required, especially for geo-tube operation.To see product discharge,settling basin influent could
be introduced onto an [elevated]spillway that flows into basin. A translucent polymer mix chamber
for visible inspection of polymer mixing with a sample port would also be helpful.
8. Settling Basin requires drainage or pumping of effluent back to lake, after allowing some settling
time.
9. Settling Basin requires dirt work to dig& berm. Geo-tube does not necessarily require a
containment basin even though one was used for this pilot,just adequate drainage back to lake
(minimal dirt work, if any with proper slope).
10. Geo-tube material does tend to become blinded or clogged. Openings in the material can be cleared
by hosing, hitting, or walking on bag.
Water,Sewer and Solid Waste Committee Agenda Page 22 of 24
11. Geo-tube is far less affected by rain since it is somewhat covered and sets up out of the water while
the settling basin is exposed to the elements and tends to collect water from rainfall.
12. An adequate polymer mix system &feed pump,designed for variable dredge material &variable
flow rates would be necessary.
13. Pumping material to a large mix tank before polymer injection would allow for equalization of slurry
concentrations to allow fewer polymer injection rate changes.
14. Basins may not need to be lined, since the sediment appears to have extremely low levels of any
contaminants. Sludge Technology, Inc®said other dredge projects they had worked with had no
liner.
15. Both Geo-tube&Settling Basin should be sloped to allow separated water to drain back to lake via
gravity rather than needing to be pumped.
16. At a minimum,there needs to be silt fence or other preventive steps taken to provide an adequate
stormwater runoff protection program,though no issues were noted with sediment runoff during
the pilot project.
17. Contractor Professionalism, Experience &Collaboration.The contractors work and professionalism
will reflect on CH2M HILL and the City of Fayetteville. A large scale project will require any
contractor used to be familiar with the work and to be communicative and cooperative.
18. Sludge Technology, Inc® hired John Flusche and his dredge (1&K Dredging®) to do the actual
dredging for them;John was very familiar with dredging and said he has larger dredges.John was
professional, knowledgeable, and cooperative and could certainly be recommended.
J&K Dredging-John Flusche 918-521-8539 4710 Elm Grove Rd. Muskogee, OK 74403 since 1994
19. Several work sites (settling basins or geo-tubes)would allow the time for dewatering to occur while
pumping continued,thus optimizing the use of the dredge. Work would proceed by filling one
settling basin or geo-tube,then start another and allow the first to dewater and so on. With a full
scale project at least 3-5 work sites will be needed.
20. A large dredge may require starting dredging at the unloading area. A large dredge will require at
least 6-ft of water depth to navigate and may require the need to dredge way to start location.
21. Sludge Technology, Inc® indicated that even with small dredge like was used on this pilot project,(4"
intake w/600 hp motor),the 5-10%solids could be pumped the entire length of Lake Sequoyah.
22. Depending on the rate of flow into the lake during dredging, full scale dredging without constant
effluent drainage back to lake may temporarily reduce the water level. It could be necessary and is
likely desirable for filtrate/effluent to be continuously pumped/drained back to lake.
23. There are many fallen limbs and trees in Lake Sequoyah and they will be difficult to work around.
Ideally they should be removed. Some type of system to cut up limbs/trees may be required before
trying to lift them with a barge-mounted crane or other device.
24. Some type of onshore landing&transfer method will be needed for removed woody debris.
25. Full scale dredge needs to be prepared for debris that will be encountered on lake-bottom.
26. An unloading zone needs to be developed to allow the dredge to be safely placed into the lake. Even
the small dredge was fairly difficult to unload at Lake Sequoyah's existing unload zone and there is
no way a larger dredge would have been able to unload there.
27. A large dredge will need a specific route to Lake Sequoyah around the bridge, since the bridge has a
maximum weight limit of 32 tons.
28. Byron Humphrey(Parks Department) mentioned maybe using a dredge for Lake Fayetteville also. If
the dredge is not to stay in Lake Sequoyah full time there will need to be a trailer available to
transport the dredge to other locations.
29. Access roads in and out of dredge areas will require not only initial upgrade to a more permanent
surface but occasional maintenance. Large dump trucks moving in and out through the fields will
Water,Sewer and Solid Waste Committee Agenda Page 23 of 24
have an impact. Subsurface and finish grade gravel for these access roads will be required for
successful long term operation.
30. Sludge Technology, Inc'said they would not recommend trying to perform dredging work
November— March due to pipes, hoses, & polymer freezing concerns and difficult weather related
working conditions. We have also noted that the drying rate during the winter months is greatly
reduced.
Water,Sewer and Solid Waste Committee Agenda Page 24 of 24