HomeMy WebLinkAboutForest Park Subdivision Drainage Improvements
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Augusta-Richmond County, Georgia
CPB# 57-8270-096
CAPIT AL PROJECT BUDGET
FOREST PARK SUBDIVISION DRAINAGE IMPROVEMENTS
BE IT ORDAINED by the Commission-Council of Augusta-Richmond County, Georgia that
the following capital project budget is hereby adopted:
Section 1. The project authorized is for the cleaning and regrading of the main ditch west of
Castlewood Drive, reconstruction of the concrete gravity wall, removal and replacement of
culverts under Castlewood Drive, installation of additional catch basins, and generally, correct
and/or improve storm drainage in the area of Forest Park Subdivision. The preliminary
engineering costs are $24,725 and are to be funded by Special 1% Sales Tax, Phase III as this
project is on the approved list.
Section 2. ,The following revenues are anticipated to be available to the Commission-Council to
complete the project':
Special 1% Sales Tax, Phase III
$24,725
Section 3. The following amount are to be expended for the project:
BY BASIN
Rock $24,725
BY DISTRICT
7th $24,725
Adopted this ---2L day of MAY
,1996.
Approved:
Original - Commission-Council Office
Copy - Finance Department
Copy - Suburban Public Works Department
Copy - Purchasing Department
, \
Augusta-Richmond County, Georgia
CPB# 57-8270-096
CAPIT AL PROJECT BUDGET
FOREST PARK SUBDIVISION DRAINAGE IMPROVEMENTS
SOURCE OF FUNDS
Special 1 % Sales Tax, Phase III
57 - 3 131-00-0000
CPB
AMOUNT
($24,725)
USE OF FUNDS
Engineering
57-8905-00-0442
$24,725
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W. R. TOOLE ENGINEERS, INC.
P.O. BOX 600 349 GREENE STREET AUGUSTA, GA 30903 (706) 722-4114 FAX (706) 722-6219
April 11, 1996
Richmond County Public Works Department
1815 Marvin Griffm Road
Augusta, Georgia
ATTEN:
Mr. Jack Murphy
Pre-Construction Engineer
SUBJECT:
Drainage Improvements
Forest Park Subdivision
TE Proposal No. P92-039
Mr. Murphy:
INTRODUCTION:
W. R. Toole Engineers, Inc. has investigated the drainage problems intheForest Park Subdivision and
prepared the following proposal. The proposal includes a description of the current problem, recommended
remedial actions, estimated construction costs, a compensation schedule, and atime frame for completion of
work. Toole Engineers is already involved in siterecOlmaissarlce and has previously interviewed area
. residents to obtain information to determine the most optimal solution'to this problem.' Based on this
information and past experience, Toole Engineers feels quaiified to provide the services required for
completion of this project.
EXISTING BASIN DESCRIPTION:
Storm drainage for the Forest Park Subdivision was designed and installed during original project
development. This storm drainage network consists of both ditches and pipes. The primary drainage feature
is a ditch located along the boundary of Forest Park North and Forest Park Subdivision Phase I.' This ditch
flows in an easterly direction from Eisenhower Drive to Castlewood drive where it is routed through culverts
to another ditch section. The outfall of the culverts co'ntinues in an easterly direction past the dead-end of
Papaya Drive to the Murray Road right-of-way where it makes a severe direction change northwesterly.
Runoff is then routed through a G x 6 triple barrel box culvert Under Riverwatch Parkway'to the Augusta
Canal. Other obstacles noted in the vicinity of the outfall area inClude a sanitary sewerage pipe located above
grade.
The basin area for the specific drainage feature consists of approximately 78 acres and is primarily piped
from Camelot Drive through Forest Park Subdivision and into the drainage ditch. A basic hydrologic analysis
of the area indicates that 25-year storm peak flows are. in the range of 200 cfs with 50-year stonn peak flows
near 230 cfs. '-
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TE Proposal No. P92-039
Page 2 of4
P~OBLEM DESCRIPTION:
Flooding is occurring to those properties located on Castlewood Drive in the vicinity of the main drainage
ditch, Three properties directly adjacent to the ditch have experienced flooding during recent rainfall events.
A retaining wall, approximately 6 feet high, was constructed along the rear of these properties to barricade
the properties from ditches inundated with stormwater. However, a recent rainfall event produced enough
nmoffto top the wall and flood the residents., Subsequently, as the water in the main ditch receded through
the culverts under Castlewood Drive, hydraulic pressure from trapped water caused the retaining wall to fail.
Downstream, near the dead-end of Papaya Drive, another residence is subjected to frequent flooding (under
the house) from stormwater exceeding the capacity of the existing ditch. Conversation with residents in the
area indicate that this problem began following the construction of Riverwatch Parkway, during which
stormwater was rerouted through a 6 x 6 triple barrel box culvert.
Drainage problems have also occurred between. Forest Park Road and Brentwood Place. Ponding of water
has occurred in the rear portions of these lots.
RECOMMENDED REMEDIAL ACTIONS:
To investigate drainage problems and recommend remedial construction activities, Toole Engineers proposes
to ground survey the existing drainage ditch, culverts, and the property found in thecvicinity of the 6 x 6 triple
barrel box culvert at Riverwatch Parkway, -. This information will be compiled and plotted into, base maps to
be used in engineering design. Preliminary.investigations of the problem indicate that mitigation of flooding
problems will require several basic remedial activities:
~ Clean and regrade the main ditch west of CastIewood Drive.
~ Reconstruct the concrete gravity 'retaining wall.
~ Remove and replace culverts under Castlewood Drive.
~ Install additional catch basins and storm drain laterals on Castlewood Drive.
~ Reroute outfall ditch to.a northeasterly direction directly in alignment with the 6 x 6 triple barrel box
culvert. (Preliminary grading may alreadyhave been accomplished by thefornler City of Augusta.)
~ .Investigate hydraulic improvements for the channel flow at the sanitary sewer crossing.
~ The flooding of the properties between Forest Park Road and Brentwood Place will require a more
extensive field inspection, There are no visible signs of water discharge points such as a headwall or
flared end section. This section of storm sewer may require smoking to determine the source of
flooding. '
~ ' A retention pond may also alleviate the drainage problems currently experienced by the subdivision
residents. However, a feasible location for the retention pond is of concern. Therefore, during the
analysis of the existing stormwater collection system, Toole Engineers will discuss any possible
locations for a retention pond with Augusta-Richmond County representatives.
ENGINEERING SERVICES:
Engineering services will include the design and preparation of construction drawings for above remedial
activities. The design will also include investigation of alternate designs for the stormwater outfall. Toole
Engineers anticipates submitting design recommendations to the Georgia Power Company for approval of
ditch improvements along an existing Georgia Power right-of-way. The Georgia Department of
. "
TE Proposal No. P92-039
Page 3 of 4
Transportation will also be contacted mid ancapplication.for special encroachment requested.
. With fmal design plans complete, individual compiled easement maps of property owners will be prepared
accordingly for right-of~way or ease~ent acquisition.
Accompanying the final design plans will be a HEC-2 water surface profile of stonnwater runoff developed
to evaluate the proposed improvements. . This infonnation will be provided to you for file reference.
ESTIMATED CONSTRUCfION COSTS:
These construction cost estimates for the proposed project are only preliminal)' and are based on anticipated
design measures. The opinion of probable construction cost is as follows:
Lump Sum Construction
Pipe Stonn Drain
Catch Basins
Channel Excavation
Rip Rap and Slope Stabilization
Foundation Backfill Material
Headwalls
Retaining Walls
Miscellaneous Class B Concrete.
Erosion Protection
$ 25,000.00
$ 49,100.00
$ 9,000.00.
$ 25,000.00
$ 7,000.00
$ 6,000.00
$ 12,000.00
$100,000.00
$ 2,500.00'
$ 5.000.00
+ 10% Contingency
$240,600.00
$ 24 060.00
TOTAL
$264,660.00
The total construction cost above does not include an estimate for construction of a retention area. Should a
feasible area be located for a retention pond Toole Engineers estimates an additional cost (grading, outlet
works, etc.) of approximately $100,000.00. .
The opinion of probable construc:tion cost may val)' depending on final engineering design and. specific site
characteristics.
COMPENSATION:
Compensation for the proposed surveying' and engineering services is based on estimated time for completion
and required manpower and resources. The compensation schedule for a project without the retention area is
as follows:
. Surveying . $ 7,525.00
. Topographical and location survey of defined project.
. Preparation compiled easement maps.
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TE Proposal No. P92-039
Page 4 of 4
Engineering
. Preliminary design.
. Final design.
. Preparation of construction documents.
. Encroachment permitting with Georgia Department of Transportation.
. Encroachment permitting with Georgia Power Company.
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$ 13,200.00
TOTAL
$ 20.725.00
Should a re~ntion area become feasible within the scope of this project Toole Engineers requests the
following additional compensation schedule to be included:
Surveying
$ 1,500.00
Engineering
$ 2,500.00
TOTAL
$ 4.000.00
Engineering services outlined herein do not.include submission of plans to the U.S. Army Corps of Engineers
for wetland permitting. Preliminary investigations indicate thatthe proposed services can be handles as a
.Nationwide 26 Permit. Should a detailed investigation indicated that additional services are required or a
significant area of wetlands is impacted, Toole Engineers will notify Riclullond County regarding these
services. the proposed fees also do not'include providing map revision data to FEMA. .
TIME SCHEDULE:
Based on authorization to proceed, Toole Engineers will initiate surveying services. Field work will require
approximately seven (7) working days. Base maps will be prepared within five (5) days thereafter.
Preliminary design plans will be prepared within two (2) weeks upon completion of base maps. These
preliminary plans will be presented to the Richmond County Public Works Department for review and
comment. Final design plans and preparation of construction documents will re'quire approximately four (4)
weeks. Toole Engineers will accompany the Richmond County Public Works Department persOIillel for field
review of the proposed improvements.
W. R. T()oleEngineers appreciates this opportunity to submit a proposal of our services to you.
Should you have any questions or require fwiher"information do not hesitate to'contact us.
Sincerely,
W. R. TOOLE ENGINEERS, INC.
cU)~
Erik Hammarlund, E.I.T.
Staff Engineer