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. ~s ~~ ~ AGENDA ITEM NO: E
~ ~~ ~
~ G ~ ~ DATE: '7- ~ ~ -9
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~ C'ITY OF ATLANTIC BEACH 'Qy~~-~j
. CITY COMMISSION MEETING ~~:%~~~~ N
STAFF REPORT
AGENDA ITEM: CONTRACT FOR REDESIGN OF STORMWATER AND UTILITY
PROJECT
SUBMITTED BY: Robert S. Kosoy, P.E./Director of Public Works ~~~~~ ~ ~~~
DATE: Jidy 7, 1999
BACKGROUND: After the City's Stormwater Master Plan was completed in 1995, the City
contracted with England, Thims & Miller, Inc. to, among other tasks, design a stormwater collection
~ system for the Core City. This design was completed in January, 1998. Due to a strong interest among
the citizens regarding environmental impact of the project, the City decided to modify the design. In
addition, the City decided to include design of strictures for tailwater control.
On December 13, 1998, the City Commission approved a contract with The R-A-M Professional Group,
Inc. (R-A-M) for a Preliminary Design Report. This report was completed on March 17, 1999. On
April 12, 1999, the City Commission directed R-A-M to revise the report to indicate what level of
service could be provided within oiu budget limit of $9 million. The revised report was delivered on
May 7, 1999. Tlus report was reviewed by the Stormwater Review Committee (SRC) on May 18,
1999, and a Public Workshop was held with the City Commission and City staff to review the report on
June 2, 1999. Additional questions were generated during the SRC meeting and the Public Workshop.
At the June 14, 1999 City Commission meeting, staff reported that R-A-M would be responding to
questions from the City Commission as s~unmarized on June 8, 1999 by City Manager, David
Thompson.
We received a report from R-A-M on July 6, 1999, and believe the questions have been adequately
addressed. Several of the questions will be answered in more detail during the final design of the
project.
RECOMMENDATION: Authorize staff to negotiate a contract with The R-A-M Professional Group, e~9_
Inc. for the final design of the Stormwater Project.
ATTACHMENTS: 1. Letter from R-A-M dated July 6, 1999, respondingto
discussion and questions of Jtme-8; I999-
REVIEWED BY CITY ANAGER:
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Sent By: The RAM Prot`essio; 904 731 5465; Jul-7-99 11:52; Page 1
_.......
~.~ .THE R-A-M PROFESSIONAL GROUP, INC.
,,,~ ENGINEERING-PLANNING-ENVIRONMENTAL CONSULTANTS
.~..-
July 6,' 1999
Mr. Robert S. Kosoy, P.E.
Director of Public Works
City of Atlantic Beach
1200 Sandpiper Lane
Atlantic Beach, Florida 32233
Post-it' Fax Note 7671 Date P~9e9~
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Re: Core City Stormwater and Utilities Improvements
Response to Staff Report from City Manager David Thompson
R-A-M Project No. 198-021-Oa
Dear Bob:
Per your request, attached are our responses to the June 9, 1999 staff report
forwarded to us from City Manager David Thompson:
7. Concerns for Sherman Creek reconnection:
Reconnection of the drainage system tv Sherman Creek is not going tv be
an easy task and there are going to be problems, but these problems in
our opinion do not make the concept of reconnection impractical. As
stated, the aerial photos we used were not up to date but the concept
should still work if we can get permission to cross the Fleet Landing
property. The reason for illustrating the proposed route is to show that we
need to be able to cross the Fleet Landing property at some point.
It is agreed that there are questions regarding feasibility and additional
modeling will be needed. In order to provide the additional modeling,
additional surveying and updated aerial photography will be needed.
!t may be feasible to drain to the Fleet Landing Lake but a much larger
connection to the Selva Marina Lagoon would need to be constructed and
the overflow structure would need to be modified to alloy flow to
discharge into Sherman Creek on the north side of Fleet Landing.
2. Use Howell Park and Johansen Park on a limited basis for ovarflow.
Using Howell Park and Preben Johansen Park as routes for transporting
the flood water through or allowing water to overflow into the park will
4d5b Salisbury Road, Suite 210 -Jacksonville, ~Iorida 32256
(90Q) 296-4440 - FAX (904) 296-4580
Sent By: The RAM Professio; 904 73t 5ne5; JUl-/-yy 71:~t; rage e
Mr. Robert S. Kosoy, P.E.
Director of Public Works
City of Atlantic Beach
R-A-M Project No. 198-027-D5
July 6, 1999---------------Page 2
certainly help to increase the level of service and also decrease the cost
of piping stormwater around these areas, Preben Johansen Park is
already being used in this way by increasing the size of the existing
conveyance ditch (see R-A-M PDR page III-2}. Howell Park could be
used in a similar manner, but #o accomplish this, the ditch in Howell Park
would need to be cleaned out and widened in some areas.
The problem of directing water into Howell Park is more difficult than for
Preben Johansen Park since the tree cover is very thick on the east side
of Howell Park. One route which has been examined is along the south
property line of the elementary school. Stormwater from Ahern, First,
Second and Third Streets could be routed along Sherry Drive then west
through the south parking area of the elementary school over tv Sea
Spray Avenue then north along Pine Street and into the Howell Park ditch.
Routing the stormwater in this manner co41d significantly reduce the
expense for the Howell Park connection although a bypass connection to
Plaza will still be required.
3. Do we need automafed flap gales or would manually operated tidal gales
be more e1~Cienf use of funds?
Automated flap gates or control valves are not necessary for proper
operation of the proposed stormwater system. Manually operated
controls are sufficient for making changes to the normal operation
although automated monitoring of the water levels in the system may be
warranted for providing water level status during a storm event and also to
provide historic documentation of water levels across the system.
4. The issue of using an inverted crown fype of roadway section for the
streets in the cone city area has been examined.and ourrecommendativn
is not fo use Phis section for the majority of the cori9 city streets.
The inverted crown was considered because the concept of installing the
trench for the stormwater piping in the middle of the road was thought to
be possibly less damaging to the trees in the core city area, but there are
other considerations which must be taken into account which include the
following:
The existing street typical section has the high point generally in
the middle of the street and to construct an inverted crown section
Sent 6y: .The RAM Professio;
Mr. Robert S. Kosoy, P.E.
Director of Public Works
City of Atlantic Beach
R-A-M Project No. 198-021-05
Juty 6, 1998---------------Page 3
would require the low point to be in the middle of the street and that
would require a significant amount of roadway subgrade
reconstruction to~have the proper structural support for the
roadway.
The ETM design included regrading the roadway profile along the
streets in the core city area to achieve a more uniform roadway
profile, which was going to require complete rebuilding of the
streets and damage to must of the trees. The R-A-M concept is to
minimize changing the roadway profiles and therefore reduce
damage to trees and also reduce costs. In order to properly design
the inverted crown roadway the profile would need to be regraded
in some areas and therefore costs would t)e increased for these
areas.
The heavy tree canopy in the core city area is also a major reason
for not using the inverted crown section. The inlets for an inverted
crown section are located in the center of the roadway and far
safety reasons cannot have a large opening at the inlet tv allow far
passage of leaves and debris which normally will clog up a grate-
type inlet. inverted crowns were never considered as the major
type of typical section for the core city area but originally they were
considered for some streets. Using this type of cross section viii
still be considered during design of the individual streets, but not far
the streets which have the large tree canopy at the low end of the
street where the stormwater is collecting. The critical aspect of a
stormwater design is resolving and addressing known problems
and flooding of the streets in these areas. Therefore every
consideration must be addressed to assure that the design
resolves the problem of flooding in the low areas just east of Sherry
Drive which also, has a large tree canopy: Use of inverted crowns
in these areas has significant potential for creating more problems,
no matter what maintenance efforts are made, rather than resolving
the problems and therefore we do not recommend using inverted
crowns in these areas. However, we will work with the City's
arborist, Mr. Early Piety, on astreet-by-street basis.
5. and 6. EXfllfldtlOR
Adding e>d'tltration does not eliminate the need for the Howell Park bypass
but adding e~itration along with using Howell Park for overflow ~~
Sent By: the RAM Professio;
~'
Mr. Robert S. Kosoy, P.E.
Director of Public Works
City of Atlantic Beach
R-A-IIfI Project No. 198-021-Q5
July fi, 1999---- Page 4
904 731 546; Jul-/-yy i~:~a; rage 4i5
significantly reduce the expense of the Howell Park bypass. Using both
the options along with the Sherman Creek connection can achieve the 5-
year l_OS. Exfiltration would be a good candidate for phasing in at a
future date since it is really not connected directly into the rest of the
stormwater system.
7. One-Way Streets for the Core City Area
The use of one-way streets could significantly reduce the roadway costs
since the roadway pavement, base, and subgrade could be narrower and
less impervious surface could potentially reduce the size of stormwater
pipes. This wou{d not make a difference in the overall cost of the
drainage system, since there would still not be sufficient room along the
roadway to use swales for transporting the stormwater as was described
in the R-A-M POR {Page IV 3).
8. Using Bypass or Overflow Pipes at the Existing Culverts
R-A-M included costs far replacing the entire existing culverts at Plaza,
11th, and the Country Club Bridge but the possibility of using bypasses for
overflow pipes will be analyzed. The reason for replacing the existing
structure completely was to remove the restrictions which these smaller
existing structures represent hydraulically, Installing a bypass or overflow
does not remove the restriction completely. However, adding to the
structure(s) may be a possibility, and during the detailed design phase, an
evaluation will be made as to whether the benefit is worth the expense for
each structure.
9. Using an arborist rather than a landscape architect.
The R-A-M PDR (Page V-4) recommends the use of an arborist, urban
forester, or qualified tree specialist to implement recommendations made.
It is R-A-M's preference to place the City's chosen arborist, Mr. Early
Piety, ander our contract to assist the team during the next phase of final
design and then as an inspector during the construction phase. Our
assigned landscape architect will also be engaged within the next phase
to assist on matters within his purview.
As discussed with City staff, jt is our recommendation to commence the design
portion of the effort, with the above scope-refinement being the basis of the final design
proposal. We believe that achieving a 5-year LOS for $9s0 million (including
construction, enginQering, and permitting) can be acct/ lished.
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Sent. By: ;he RAM ProTessio;
~,
Mr. Roberts. Kosoy, P.E.
Director of Public V1/orks
City of Atlantic Beach
R-A-M Project No.198-021-05
...July 6,.1999 --..--Page 5
904 731 5465;
If you have any questions, please advise.
Best personal regards, ~-
7HE R~A-M PROFESSIONAL GROUP, 1NC.
~.. ~' --
Frank E. Gray, Jr., P.E.
Principal and Director of Engineering
Jul-7-99 11:54;
Page 5/5
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