AgendaCITY OF ATLANTIC BEACH
800 SEMINOLE ROAD
SPECIAL CALLED MEETING
MONDAY, DECEMBER 18, 2000
5:00 PM
AGENDA
Call to order
Award contract for solid waste collection pursuant to the specifications of Bid No.
0001-2
`"""" 2. Discussion and possible action regarding the Sewer Master Plan
3. Authorize the City Manager to sign the Grant Award Calculation and Addendum
No. 1 to the agreement with the City of Jacksonville and Florida Communities
Trust relative to the purchase/reimbursement of the Centex property
4. Any other business
Adjournment
If any person decides to appeal any decision made by the City Commission with respect to any matter considered
at any meeting, such person may need a record of the proceedings, and, for such purpose, may need to ensure that a
verbatim record of the proceedings is made, which record shall include the testimony and evidence upon which the
appeal is to be based.
In accordance with the Americans with Disabilities Act and Section 286.26, Florida Statutes, persons with
`~" ` disabilities needing special accommodation to participate in this meeting should contact the City Clerk
MINUTES OF THE SPECIAL CALLED MEETING OF THE
ATLANTIC BEACH CITY COMMISSION HELD IN CITY HALL, 800
SEMINOLE ROAD AT 5:00 P.M. ON MONDAY, DECEMBER 18, 2000
PRESENT: John Meserve, Mayor
Richard Beaver, Mayor Pro Tem
Mike Borno
Theo Mitchelson
Dezmond Waters, Commissioners
AND: James Hanson, City Manager
Alan C. Jensen, City Attorney
ABSENT: Maureen King, City Clerk
e meeting was c e to or er y ayor eserve at p.m. n p ace
of the Invocation, Mayor Meserve called for a moment of silent prayer
for Utility Director Kaluzniak's father who is facing major surgery. The
silent prayer was followed by the Pledge of Allegiance to the Flag.
1. Award Contract for Solid Waste Collection Pursuant to the
Specifications of Bid No. 0001-02
..~.,.
Mayor Meserve stated that he would like to receive public comments
before awarding the bid.
Madeline Gray of 1829 Selva Grande Drive, owner of Seafood
Kitchen, requested an explanation of the rate formula used for
commercial garbage pick up. She stated that her gazbage bill was very
high and she would appreciate a reduction. City Manager Hanson stated
he would be happy to assist her, and requested that Mrs. Gray contact him
the following morning.
Kay Friedemann of 1898 Selva Marina Drive favored one day per
week yard trash pick up if pick up could be guaranteed. Mrs.
Friedemann stated that the current hauler rarely picked up any Yazd trash
on the second day, and if her yard trash was put out and missed, she had
to carry it back into her yazd due to the lack of pazking spaces on her
block of Selva Manna Drive .
Mary Williams of Southland Waste distributed copies of the results of
a residential survey she conducted which favored her company's
proposed Wednesday yard trash pick up if it saved the city money. Ms.
Williams indicated that their low alternate bid was based on Wednesday
pick up, and would save the city $18,827 over the next lowest bid.
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December 18, 2000
r"'"" Mayor Meserve indicated that issues concerning awarding the contract
which came up at the December 11, 2000 were being addressed. City
Manager Hanson indicated that the following three areas needed to be
addressed: (1) a choice of level of service, (2) savings realized if service
was reduced to once a week pick up, and (3) the options associated with
the once a week service.
City Manager Hanson indicated that if the Commission decided on once a
week service, it must determine whether the collection would be on
Monday or Wednesday. He further stated that the essential difference
between the BFI and Southland Waste bids was the collection day, and
indicated that if Monday was more important, then a decision must be
made to determine if it was worth the additional $19,000 per yeaz, and if
it was worth it, then the low bid would be $749,041.46 from BFI.
However, if it was not worth the additional expenditure, then the
Southland Waste bid should be considered, which was for Wednesday
collection. He further stated that the legality of the Wednesday collection
day also needed to be addressed, since the question azose as to whether
Southland Waste could offer an alternate bid which was discussed during
the pre-bid conference, but was not specified in the bid specifications or
included in the written bid addendum distributed after the pre-bid
~~~_
conference.
Commissioner Mitchelson felt the city should look at the low bid based
on the bid specifications and choose Monday pick up.
Commissioner Beaver requested an opinion from City Attorney Jensen on
Southland Waste's alternate bid for Wednesday pick up. City Attomey
Jensen stated that Wednesday pick up was not included in the original bid
specifications or the addendum distributed after the mandatory pre-bid
meeting. He further stated that Southland Waste was the only company
to bid the Wednesday pick up. Commissioner Beaver stated that he had
conducted his own informal survey and everyone he had spoken with
favored Monday pick up. He felt the city should stay with Monday pick
up.
Commissioner Borno also favored Monday and stated that several
citizens who contacted him either favored Monday or had no preference.
Motion: Award the contract to BFI based on a once a week
pick up on Monday (Alternate 1).
Amendment to the motion: Add "in the amount of
$749,041.56".
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December 18; 2000
Mayor Meserve felt the city had only two choices, to either rebid the
service or accept the low bid for Monday pick up (Alternate 1).
There being no further discussion, the amendment to the motion and the
main motion carried unanimously.
2. Discussion and Possible Action Regarding the Sewer Master
Plan
City Manager Hanson indicated that the concerns expressed during the
December 11, 2000 Commission Meeting would be addressed, as well as
those presented in writing by Commissioner Mitchelson. He then
introduced Doug Layton, Vice President of Smith and Gillespie
Engineers, Inc., and Scott Lee, Project Manager, who were instrumental
in preparing the Sewer Master Plan.
Public Works Director Kosoy provided background information and
responded to several concerns raised at the previous meeting as follows:
Infiltration
Public Works Director Kosoy stated that the tests for infiltration
performed in 1993 were completed in two days, whereas, those
completed by Smith and Gillespie Engineers covered a period of one year
beginning in April 1999. He noted an 1$% increase in infiltration during
the seven years between tests (1993 to 2000), but this was not considered
an unusual amount and was expected over the seven year time span.
Public Works Director Kosoy reported that twelve streets were surveyed
for evidence of heat pumps during this year's Insituform project, and only
one was found and heat pumps were not found to be major cause of
infiltration problems for the sewer system.
Piping of Sewage from North Atlantic Beach Back to the Buccaneer
Wastewater Treatment Plant
Public Works Director Kosoy reported that the piping began in 1993,
with the endorsement of the Water and Sewer Committee, because there
was no capacity at the Buccaneer plant. At that time, it was
recommended that a lift station be built at Sea Gardens to divert the
flow back to the Atlantic Beach plant. It was pointed out that only 7.8%
of the flow to Lift Station B came from the Sea Gardens and Oceanwalk
F,~„„ lift stations.
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December 18, 2000
""""" Sewer Pipe and Sewer Pipe Rehabilitation
It was explained that the sewer pipe was analyzed in the Sewer Master
Plan by using the different mini-systems throughout the city, and this
analysis confirmed that the areas with vitrified clay pipe had the worst
infiltration and those with PVC pipe had the least.
Relative to the question concerning rehabilitating the existing 8" sewer
line and adding a smaller line for additional capacity, Public Works
Director Kosoy responded that from experience, rehabilitating sewer
pipe with some type of roto-rooter device was not recommended because
of the structural problems it caused. It was pointed out that the "young"
pipes in the sewer system were thirty-five years old.
Influent Structure Elevations
Public Works Director Kosoy displayed a photograph of the structure and
stated that its 21' elevation above the sewer pipes that feed into it posed a
major problem for the system.
Public Works Director Kosoy deferred to Doug Layton and Scott Lee for
`~~~' an in depth explanation of the problems related to the structure.
Doug Layton distributed a compilation of background information from
the Sewer MasterPlan relative to the design and/or construction
recommendations for capital improvements included in the plan. This
information is attached and made part of this official record as
Attachment A.
Doug Layton referenced the schematic map of the city's lift stations
found on page 1 of the handout and briefly explained the operation of
manifold force mains.
Mr. Layton stated that Smith and Gillespie wanted to prove the city did
not need a master lift station, but were unable to do so. He referenced
page 5-12 of the report and pointed out the steps they went through to do
so.
The cost comparison for improvements found on age 5-15 of the report
was addressed, and Mr. Layton explained Alternates 1 and 2 as they
related to the information provided on page 5-12.
~,.,,,, Commissioner Borno confirmed that the 12" PVC force main listed in
Alternate 1 would replace the 10" main coming. from Lift Station B to the
plant as part of the master wetwell option. Mr. Layton stated that this
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December 18, 2000
^"""~ item was included in both Alternate 1 and 2. It was pointed out that
Alternate 2 was more expensive and not recommended for that reason.
City Manager Hanson pointed out that prior to 1986, the lift stations did
not have to pump to the present elevation, and were not designed to do
so.
Discussion of pumping sequence, frequency of pumping and manifolding
ensued.
Discussion ensued concerning Alternate 2, which would eliminate the
master wet well. It was pointed out that even if the sewer lines were
installed side-by-side, the pump size would have to be upgraded because
the current pumps could not pump up to the top of the influent structure
(existing headworks).
Commissioner Mitchelson inquired if any data was available relative to
infiltration on private property, since slip lining sewer in the core city
area. Public Works Director Kosoy stated that no data had been put
together, but a reduction in flow had been noted.
Discussion continued and it was pointed out that even if a SCADA
"~ system was installed, a master lift station and the other capital
improvements would still be required. Priority allocation was also
discussed and it was agreed that those items listed in the submitted
capital improvement recommendations for the first year had the highest
priority.
Mayor Meserve felt that the capital improvement recommendations in the
Sewer Master Plan were a good beginning, and the city should take
action on those recommendations. He felt it was important to plan for
the future, find a source of funding for this and other long term projects
and make them part of the strategic plan for the city. He indicated the
additional''/z cent sales tax, which goes into effect January 1, 2001, could
be used as a funding source for infrastructure projects.
At the request of Commissioner Waters, Doug Layton explained how the
recommended improvements would prevent any future sewage overflows
into Howell Park.
3. Authorize the City Manager to Sign the Grant Award
Calculation and Addendum No. i to the Agreement with the
City of Jacksonville and Florida Communities Trust Relative
to the Purchase/Reimbursement of the Centex Property
,-~,.
Motion: Authorize the City Manager to sign the Grant
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December 18, 2000
Award Calculation and Addendum No. l to the Agreement
with the City of Jacksonville and Florida Communities Trust
relative to the purchase/reimbursement of the Centex
property.
There was no discussion and the motion carried unanimously.
4. Any Other Business
Proposed Rules for Commission Meeting Conduct
Mayor Meserve expressed concern that a pattern had been established
whereby at the end of discussion of very complex, technical issues,
someone would bring up a technical question which could not be
answered immediately and the process would be brought to a halt. He
suggested that the Commissioners and citizens write down their questions
and submit them prior to the meeting, to allow staff time to research the
question and provide an answer.
He further stated that there was no problem with requesting additional
information, but there should be a better, more efficient way to operate
`~' during discussion of complicated issues.
City Manager Hanson stated that he has been with the city a year, and had
also noticed the pattern of behavior described by the Mayor. He felt this
pattern was disruptive, and provided an example of what has occurred at
several meetings. City Manager Hanson indicated that after the
presentation of facts the next step seemed to be for the speaker to find
fault with major public works projects, frequently followed by personal
attacks on staff, either directly or indirectly. City Manager Hanson
observed that the speaker often appeazed not to want a response and
would leave early or make no comment at all when staff presented a
follow-up report at the next meeting.
City Manager Hanson commented on name calling of staff, and stated
that the city had developed a poor reputation with engineers who refuse
to bid on projects because they know they will be maligned. City
Manager Hanson felt that being insulted disrupts the thought process, and
felt that everyone should be honest and respectful of other opinions.
City Manager Hanson recommended that the Commission adopt a rule
prohibiting personal attacks and name calling. He distributed copies of
,--m- Robert's Rules of Order relative to decorum during debate.
City Manager Hanson also recommended that the resources be available
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December 18, 2000
'""" when something of a technical nature was discussed before the
Commission. He felt speakers should present their technical issues to
staff at least two days prior to the meeting, so that the proper responses
may be given. It was recommended that the Mayor immediately refer
any technical issues not reviewed by staff, to staff and bring it back at the
next meeting. City Manager Hanson also agreed with Mayor Meserve's
suggestion that Commissioners submit in writing to staff any technical
questions on matters previously discussed.
City Manager Hanson believed it was important to have a free and open
exchange of ideas and disagreements aired in a public meefing, as part of
the democratic process. However, he felt it was inappropriate to allow
anybody to say anything they want, at any time they want. He felt the
previous policy had been abused and suggested the Commission adopt
rules dealing with decorum.
Commissioner Mitchelson suggested that when dealing with lazge,
technical projects they would be easier to understand if one or two status
reports were submitted at different levels of completion, followed by a
formal presentation of the final report.
~~ Mayor Meserve felt it was the Commission's function to understand the
basics, to hire competent engineers in a competitive manner, and follow
their recommendations, as long as the technical experts on staff agree
with their findings. He felt that unless the Commission knew something
different, it was alright not to understand completely every aspect of a
project. Mayor Meserve urged the Commission to give thought to the
City Manager's recommendations, and bring this matter back at a future
meeting. He urged the Commission to study the issues, understand the
basics and keep the general public informed. He felt that questions
should be answered before a vote was taken to avoid going back and
readdressing and voting on the same items. He favored adopting some
type of a policy dealing with this matter.
Commissioner Waters felt that more time was needed to study
information in the packets and ask questions. He felt earlier delivery of
the packets would help. Discussion ensued, and Mayor Meserve
reiterated his position that no decision be made on any technical matter if
additional information was required. He suggested deferral until the
matter was understood.
Commissioner Beaver stated that he had a copy of the draft agenda faxed
to him on Wednesday, which gave him an eazly "heads up" to matters
coming before the Commission. He suggested that someone other than a
police officer deliver the packets to ensure they will be received on
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December 18, 2000
`""~'"' Thursday.
Discussion ensued concerning delivery options. Commissioner Borno
felt that the current Thursday packet delivery worked well and should not
be changed.
5. City Manager Reports:
Incinerator Site Update
• Provided an incinerator site update and indicated that he would
meet with officials from the Department of Environmental
Protection (DEP) this week to look at the site, and indicated that
the Health Department would test the top four inches of soil by
the end of the week and said that groundwater would be tested
later.
10. Reports and/or requests from City Commissioners and City
Attorney
There being no further discussion or business to come before the
Commission, the Mayor declared the meet}~g adjourned at 7:30 p.m.
ATTEST:
Maureen King
Certified Municipal k
Officer
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Attachment A
__ _ _ _ _ _ _ _ __ _ ^_ December 18, 2000 Special Called Meeting
Discussion of the
Sewer Master Plan
for the
City of Atlantic Beach
Commission Workshop
December 18, 2000
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7200 SANDPIPER LANE
ATLANTIC BEACH, FLORIDA 32233 904-247-5834
SMITH & GILLESPIE
ENGINEERS INC.
LJ uao c~ m~liw • ro. eo: m»e • ~Kwon.u~, n~a, mop • tow) ~~s-eoso
S&G Proj. No. 8505-25-01
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The initial alternative was to solely increase the pump, impeller, and motor
~,~, size to achieve no wet well surcharges. After three model runs selecting
similar above ground, self-priming pumps, the pump and motor sizes for
most of the pump stations became very large on the order of 50-75 hp for
m, each station. Considering the electrical requirements and wet well storage
volumes currently available, it was decided that solely upgrading the pumps
was not a viable option to keep pace with the 2010 projected flows and wet
weather. Instead, a combination of pump and motor increases and new force
mains was viewed as a different alternative.
.~ Numerous model runs were executed to determine the size of the pumps and
force mains. In order to achieve no wet well surcharges during wet weather,
the following changes were made to the existing system.
1. Pump Station A existing pumps changed to 1550 rpm and new 50 hp
motors to replace the existing 40 hp motors are necessary.
2. Pump Station B existing pumps changed to 1550 rpm and new 50 hp
motors to replace the existing 30 hp motors are necessary.
.,. 3. Pump Station C existing pump changed to 1350 rpm and new 30 hp
motors to replace the existing 20 hp motors are necessary.
4. Pump Station E existing pump changed to 1750 rpm and new 25 hp
-a motors to replace the existing 15 hp motors are necessary.
5. Pump Station F existing pump changed to 1750 rpm and new 25 hp
motors to replace the existing 20 hp motors are necessary.
~-- 6. The 10" force main downstream of Station B was modeled as a 12"
PVC force main.
7. A separate 8" PVC force main was added to serve Station C only.
"°' 8. The existing 6" force main from Station E was changed to an 8"PVC
force main.
9. The wet well drawdown volume needs to be increased at Stations C
W" and E by a minimum of 1 foot.
Pump curves supplied by the City were utilized to model the increases in the
pump's RPMs. In no case was a different pump model required at any of the
pump stations: However, some of the RPMs selected for a given pump Z.
~., model are the highest available on the manufacturer's pump curves. In other
cases, new motors are required because the new operating condition is
outside of the old motor's operating range. Tables 5.10 and 5.11 relate the
proposed pumping capacity during wet weather, as well as the velocity in the
force mains.
SEWER SYSTEM MASTER PLAN 8505-025-0I
NOVEMBER 2000 5-~ 2
Table 5.12 Cost Comparison for Improvements Required to Address Surcharges in the Manifolded
~~" Atlantic Beach Force Main System
ALTERNATIVE 1 -Addition of a Master Pump Station with Other Pump Station and Force Main Improvements
Item No.
QTY Unit Unit Cost Rounded Total
a, 1 Master Pump Station 1 Each $ 350,000.00 $ 350,000.00
2 12" PVC Force Main 1600 Feet $ 54.00 $ 86,000.00
3 8" PVC Force Main from Station C 1400 Feet $ 36.00 $ 50,000.00
4 Pump and Motor Upgrade at Pump Station E 1 Each $ 50,000.00 $ 50,000.00
„m
Subtotal $ 536,000.00
_, Contingency $ 30,000.00
Note: Cost estimate shown for Master Pump Resident Observer $ 65,000.00
Station is equivalent to the cost estimate Engineering and Permitting $ 60,000.00
„~, previously provided to the City by others,
which includes a construction contingency. TOTAL $ 691,000.00
mn ALTERNATIVE 2 -Increasing the Pump and Motor Size at the Pump Stations with New Force Mains and
Without a Master Pump Station
Item No. Description QTY Unit Unit Cost Rounded Total
_"
.....
1
Pump and Motor Upgrade - Station A
1
Each $ 86,400.00
$
86,000.00
2 Pump and Motor Upgrade - Station B 1 Each $ 86,400.00 $ 86,000.00
~' 3 Pump and Motor Upgrade - Station C 1 Each $ 72,000.00 $ 72,000.00
4 Pump and Motor Upgrade - Station E 1 Each $ 62,400.00 $ 62,000.00
5 Pump and Motor Upgrade - Station F 1 Each $ 62,400.00 $ 62,000.00
"" 6 12" PVC Force Main 1600 Feet $ 54.00 $ 86,000.00
7 8" PVC Force Main from Station C 1400 Feet $ 36.00 $ 50,000.00
8 8" PVC Force Main from Station E 1350 Feet $ 56.00 $ 76,000.00
Subtotal $ 580,000.00
Contingency $ 120,000.00
Engineering and Permitting $ 140,000.00
TOTAL $ 840,000.00
°° Note: Pump and motor upgrades include
electrical work, foundation work and piping
modifications at each lift station.
~~
SEWER SYSTEM MASTER PLAN
,.R NOVEMBER 2000 5-15 8505-025-01
Table 5.2 Atlantic Beach Pump Capacity Vs: Maximum Projected Flow
Lift Station
Current Pump Capacity Year 2010 Maximum Projected
Flow Through Lift Station (GPM)
A 568 570
B 783 861
C 452 484
D 376 265
E 189 393
F 252 214
C, 206 83
H 54 62
1 276 170
7 299 42
K 112 32
L 75 26
M 288 27
N 242 39
O 93 95
SEW ER SYSTEM MASTER PLAN
~""" NOVEMBER 2000 5-3 8505-025A1
`""` Table 5.1 Atlantic Beach System Infiltration Ranked Results
Mini-System
Relative Infiltration Flow
Rate (GPM) Relative Infiltration as a
Function of Mini-System
Flow
Amount of Pipe in
Mini-System (FT)
I 31 90% 5,450
O 31 83% 3,700
B 192 69% 39,050
J 10 71% 1,800
A 119 51% 36,220
F 47 43% 19,600
H 6 29% 2,250
D 19 17% 29,750
K 1 15% 10,350
E 20 13% 18,750
C 3 Z% 25,150
G 1 2% 16,300
L 0 0% 10,150
M 0 0% 11,450
N 0 0% 6,300
~~
SEWER SYSTEM MASTER PLAN
NOVEMBER 2000 5-2 8505-025-Ot
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SMITH AND GILL ESPIE ENGINEERS, INC.
ROST OFFICE BOX 53i3B
m•~ JAC KSOVVILLE. FLORIDA 32201
December 12, 2000
Ms. Donna Kaluzniak
-M Assistant Director of Public Works
City of Atlantic Beach
1200 Sandpiper Lane
~- Atlantic Beach, Florida 32233
I2E: SCADA System Installation vs. Lift Station Improvements
~° S&G Project No. 8505-27-01
Atlantic Beach, Florida
"°' Dear Ms. Kaluzniak:
Y`(1~
C5(..
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You asked us to address the following questions regarding the recommended lift station
improvements for the Atlantic Beach sewer system. Following is our understanding of the
questions, and our response to same.
"` ,,~ I . If a SCADA system is installed, will a master wet well still be required?
Our understanding is this question pertains to using the SCADA system to cycle pump
operations at the five manifolded lift stations, and at the upstream contributory Lift stations, in
a manner that allows the five manifolded lift stations to function in sequence, rather than in
pazallel. If this operating protocol can be utilized, then the overall pressure in the common
portions of the manifolded force main would be reduced, thereby allowing individual
~"" manifolded lift stations to pump more water at lower discharge pressures, and eliminating the
need for the master wet well.
2. Could installation of a SCADA system obviate the need for increased wet well storage
volume at Lift Stations C and E?
Again, our understanding of this question pertains to using the SCADA system to cycle
pump operations in a manner that allows the five manifolded lift stations to function in
sequence, thereby reducing the amount of storage volume required in the wet wells of these
two lift stations.
Background Discussion:
The answers to these two questions are interrelated. Wet well storage volume, pumping
capacity, and inflow rate aze the three parameters by which pump station operations are
„~ analyzed. Typically, pumps aze sized to handle peak flow rates, and wet wells aze sized to both
store enough water to allow the pump. motors to cool off between operating periods, and to
provide extra storage volume during peak .inflow rate events. If the wet well is oversized, then
~„'""~~` the pumps have longer cooling-off periods, the normal pump cycle time is increased, and the
SMITH AND GILLES PIE ENGINEERS.INC. 1v1S. DOIllla l~alUZniak
S&G File No. 8505-27-O1
December 12, 2000 ..... Page 2
a..:~-~
'"" station has additional capacity available for water to be stored during peak inflow events. If wet
wells are undersized, then the pumping cycle time is decreased, perhaps to the point of damaging
the pumps, and the station has limited capacity to store water during a peak inflow event.
If the pumps are oversized, then they pump down the wet well faster, and can better handle peak
inflows. If the pumps are undersized, then they have difficulty keeping up with peak inflows,
`"` and tend to operate continuously for longer periods of time.
Where sufficient excess wet well storage volume exists, SCADA systems are successfully used
to cycle lift station operations on manifolded force main systems, thereby reducing the total
pumping head, or "back-pressure", faced by each individual pump. For centrifugal pumps, such
as those typically used in sewer lift stations and in service at the Atlantic Beach and Buccaneer
District lift stations, lowering the head against which a pump must work will allow the pump to
move more water. Thus, if an adequate amount of water can be stored at each manifolded lift
station, then the pumps could be operated in sequence, and it is possible that the master wet well
may not be needed.
Analysis of the Atlantic Beach lift station system indicates that during peak flow events, such as
^~^- rain storms, all of the five manifolded lift stations operate neazly continuously, as do key
upstream contributory lift stations, such as Lift Station D. Dynamic modeling of the manifolded
lift station system indicates that during peak inflow events, insufficient pumping capacity exists
in the manifolded lift stations to pump to the treatment plant all of the water directly flowing
from the collection system; and flowing from the upstream lift stations. Dynamic modeling also
,,,, indicates that insufficient wet well storage capacity exists to store the excess water that enters the
stations during peak events. This modeling is verified by the occurrence of sewer overflows
associated with these lift stations.
However, the Atlantic Beach lift stations currently have inadequate wet well storage volume
relative to the peak sewage inflows experienced during significant rain events. Furthermore,
..m, insufficient accessible land azea exists at Lift Stations A, B, C, D and F to physically construct
additional wet well storage volume.
Answers to Questions:
I. If a SCADA system is installed, will a master wet well still be required?
® Yes, the master wet well will still be required. The manifolded lift stations have insufficient
pumping capacity and wet well storage volume to remain off-line for any amount of time
during a peak inflow event. Although functionally capable of operating the individual lift
stations in a sequential manner, a SCADA system will not provide additional wet well
storage volume, nor increase pumping capacity at any of the lift stations.. Attempting to
~„ control the operation of these lift stations in a sequential manner during a peak inflow event
`- will result in an increased incidence of sewer overflows.
"'°° SMITH AND GILLESPIEENGINEERS,INC. 1vIS.DOnnaKalUZnlak
S&G File No. 8505-27-O1
December 12, 2000 ..... Page 3
2. Could installation of a SCADA system obviate the need for increased wet well storage
volume at Lift Stations C and E?
No, additional storage volume is needed at Lift Stations C and E. Note that for Lift Station
C, analysis indicates it is possible to obtain the required amount of increased wet well
volume by changing the elevations at which the pumps turn on and off. Construction of
additional wet well volume was not recommended at Lift Station C. The additional wet well
volume recommended at Lift Station E was to be constructed outside of the existing lift
station, and connected to the existing wet well. The volume of storage recommended was
based on a dynamic analysis of the entire manifolded system, and is part of an integrated set
of improvements designed to minimize sewer overflows from these lift stations.
"~ Thank you for the opportunity to assist you in answering these questions. The City is to be
commended on your understanding of the technical details of your system, and on your
persistence in achieving acost-effective solution to this problem.
Please call us if you have any questions.
Sincerely,
SMIT ND GILLESPIE ENGINEERS, INC.
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C. Scottie, P.E.
CSL:js W:\8505.DKALUZNIAKLTR.D7 LDOC
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Tahle 5.14 Buccaneer District Pumu Capacity Vs. Maximum Projected Flow
Lift Station
Current Pump Capacity Year 2010 Maximum Projected Flow
Through Lift Station (GPM)
Aspen Ridge 504 174
Courtyazds 849 224
Cypress Creek 671 196
Featherwood 80 37
Lakeside 517 417
Wonderwood 195 101
Mimosa Cove 610 668
Montreal 246 150
Navy 242 217
pan Am 670 98
Shangri-La 591 172
Schooners Bay 152 82
West End 159 83
SEWER SYSTEM MASTER PLAN
~"° NOVEMBER 2000 5-18 8505-025-O1