Exh 8B
CITY OF ATLANTIC BEACH
CITY COMMISSION MEETING
STAFF REPORT
AGENDA ITEM: Code Revisions for Stormwater Management
SUBMITTED BY: Robert S. Kosoy, P.E. ~~~~~
Director of Public Works
AGENDA ITEM #8B
JANUARY 27, 2003
DATE: January 21, 2003
BACKGROUND: As we consider adoption of our second Stormwater Capital Improvements
Program, we have found the need to update our City Codes, particularly
Chapters 22 and 24. Code revisions are needed to address our National
Pollutant Discharge Eliminiation System (NPDES) permit, filling/
excavation on property with no construction, and overall stormwater
management.
Regarding compliance with our NPDES permit, there are two concerns.
First, our NPDES permit, which we have had in effect since 1997, is signed
every year and reviewed and approved by the City Commission, but its
requirements are not codified. The NPDES requirements, which include
construction sites, are proposed to be added to Chapter 24 of the Code by .
reference. Second, beginning 4/1103, all construction projects of 1 acre or .
more will require a NPDES permit and it will be the City's responsibility to
insure these sites have an approved permit. This requirement is proposed to
be added to Chapter 24 in the Code.
Although we have recently revised the Code to require topographic surveys
for single family home construction, we have no provisions for
filling/excavation on property with no construction. By codifying on-site
and flood plain storage, and stormwater treatment requirements, we will be _
able to address these needs. The Code changes will enhance overall
stormwater management and be a joint effort of the Building and the Public
Works Departments.
In addition, we are proposing a form for developers and homeowners to
provide guidance for compliance with NPDES requirements. This form is
proposed to be distributed to all applicants for building permits. The
proposed Code changes are attached.
RECOMMENDATION: Review proposed Code changes to Chapters 22 and 24.
ATTACHMENT: Proposed Code changes.
Forms for permit applicants.
' REVIEWED BY CITY MANAGER:
w
Sec. 22-335. Fees.
AGENDA ITEM #8B
JAi~1UARY 27, 2003
(a) ERU rate. The fee per ERU billing unit shall be twee four dollars ($34.00) per
month.
SECTION 24-b7
(d) Stormwater drainage, storage and treatment requirements.
(1) Topography and Grading: All lots and development sites shall be constructed
' and graded in such a manner so that the stormwater drains to the adjacent street, an
existing natural element used to convey stormwater (See section 22-303, definitions:
Stormwater management system), or a city drainage structure after meeting on-site
' storage requirements, as listed in this Section. The city shall be provided with apre-
constructiontopographical survey prior to the issuance of a development permit and a _
post-construction topographical survey prior to the issuance of a certificate of occupancy.
' The surveys shall be prepared by a licensed Florida surveyor, and the requirement for
either or both surveys may be waived by the director of public works if they are
determined to be unnecessary.
' 2 On-Site Stora e: The a licant will be re uired to rovide on-site stora e
!) g PP q P ~ ,
such that there is no increase in the rate or volume of flow to off-site, from every
developed or redeveloped parcel, and provide documentations and calculations to
demonstrate compliance. Subdivisions and developments previouslypermitted by the
' SJRWMD, and have an in-compliance retention/detention system that collects and
controls runoff, are exempt.
' Vo_ l_ume calculations for lots that require on-site storage should be based on the difference
in runoff volume generated by the new impervious area ("delta volume") and would be
calculated bv: V=CAR/l2, where ..
' V =volume of storage in cubic feet,
' A =area of the lot in square feet,
R = 25 year and 24 hour rainfall depth (9.3 inched over the lot area, and
C =runoff coefficient, which is 0.6 for the 50% maximum imperviousness, 0.4
for 25% imperviousness, and 0.2 for 0% imperviousness. .
1 This delta volume (post V minus pre V in cubic feet) must be stored at least 1 foot
above the wet season water table and below the overflow point to offsite (in many cases
' this maybe the adjacent road elevation). As an option, and as approved by the Director
of Public Works, the owner of the parcel to be developed or redeveloped may implement
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AGENDA ITEM #813
JANUARY 27, 2003
at the applicant's cost, offsite storage and necessary conveyance to control existing flood
stages offsite.
(3) Flood Plain Storage: There shall be no net loss of storage for areas in the
100-year floodplain, where a floodpIain elevation has been defined by either the Federal
Emer~ency Management A~encv (FEMA) on Flood Insurance Rate Maps (FIRMS) the
1995 Stormwater Master Plan ,the Core City project or the 2002 Stormwater Master
Plan Update (e.~., Hopkins Creek). Site ading shall create storage on-site to mitre
for filling of volume on-site. This storage is in addition to the storage required for the
increase ~n impervious area.
(4) Stormwater Treatment: Stormwater treatment shall be provided for a volume
equivalent to either retention or detention with filtration of the run-off from the first one
~l_) inch of rainfall; or as an option for facilities with a drainage area of less than one
hundred (100) acres, the first one-half (1/?) inch of run-off pursuant to Chapter 62-25
Florida Administrative Code (FAC). No discharge from any stormwater facility shall
cause or contribute to a violation of water quality standards as provided in Section 6~ 30~
of the Florida Administrative Code. This treatment volume can be included as part of the
on-site storage requirement in item d (2~ of this Section. .
(5) NPDES Requirements: All construction activities shall be in conformance
with the City's National Pollutant Discharge Elimination System (NPDES~permit in
addition to the requirements of the Water Management District and the Florida
Department of Environmental Protection. NPDES requirements include use of Best
Management Practices (BMPs) prior to discharge into natural or artificial drainage
systems. Be~innin~ April ] , 2003, all construction proiects of one acre or more with
require an NPDES permit.
J
AVOID COSTLY FINES and STOP WORK ORDERS
AGENDA ITEM #8B
JANUARY 27, 2003
' BEST yIANAGEMENT PRACTICES (BNII') -General Site Design Criteria
No clearing, grading, excavating, filling, or other disturbances of the natural terrain will be
' permitted until the City's approved erosion and sediment control measures have been
installed, except those operations needed to implement these measures. A clearing permit
is required by the Building and Zoning Departments of the City of Atlantic Beach.
' CA LL 247-5834 FOR EROSION & SEDIMENT CONTROL INSPECTION
CALL 247-5813 FOR TREE BARRICADE INSPECTION .
' Effective April 1, 2003, projects that will disturb one or more acres of I
and and that
discharge stormwater to either a municipal separate storm sewer system (TVI54) or to
.surface waters of the State must obtain coverage under the State of Florida Generic
Permit for stormwater Discharge from Large and Small Construction Activities
(CGP) [DEP Document 62-621.300(4)(x)]. CGP notification requirements include:
' ~ ~ A com leted
p CGP Notice of Intent (NOI) (DEP Form 62-621.300(4)(b)] must be_.
. submitted to FDEP before the commencement of construction. _.
• A completed Notice of Termination (NOT) [DEP Form 62-621.300(6)] must be
' submitted to FDEP to discontinue permit coverage. A NOT may be submitted
only when the site meets the eligibility requirements for termination specified in
the CGP.
' Janu 13 2003
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Ci
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AGENDA ITE1V1 #8B
JANUARY 27, 2003
Erosion and sediment control measures are site specific. Erosion and sediment control is
performance oriented. Even if control measures are installed on a site in accordance with
the approved plan, the site is only in compliance when the erosion and sediments are
effectively controlled.
The erosion and sediment control measures in the construction plan shall consist of; but not
be limited to, the following items:
1. The plans specify in detail the erosion and sedimentation control measures to be
used during all phases of clearing, grading, filling, construction and permanent
development, and accurately describe their proposed operation. ^ Yes No ^
2. These plans are in accordance with the latest applicable specifications and
recommendations. ^ Yes No ^
3. The plans provide an installation sequence for measures to control erosion and
sediment -construction sequencing - a construction schedule setting forth a
sequence of development activities -minimizing the extent of the "disturbed
area" exposed at any particular time. All "disturbed areas" should be stabilized.
Temporary or permanent stabilization is required. ^ Yes No ^
4. Study the terrain. Review the available aerial photos. Review the groundwater
contour maps, and soil borings, if any, to see the groundwater flow pattern
through the site. Look for hydraulic divides. Surface drainage divide may not
coincide with groundwater divide. ^ Yes No ^
5. Study the surrounding areas. Is the site bordering a sensitive area such as a
wetland or water body? The perimeter should be protected against
off-site sedimentation. Pay particular attention to critical areas such as steep cut-
and-fill slopes, stream crossings, channels, storm-sewer inlets, outlets of pipes_..
and diversions, construction access routes, and highly erodible soils. -
^ Yes No ^
6. The construction entrance is stabilized and well maintained to prevent the
tracking of soil, mud, concrete, debris, etc. onto public streets. Traffic route is
clearly marked for drivers -this will prevent driving on "disturbed areas" -
hence, less compaction on "disturbed areas" -more infiltration in "disturbed
m'e~•" ^ Yes No ^
7. Off-site runoff entering the site is adequately addressed. ^ Yes No ^
8.' Grade changes do not alter the natural flow of off-site uphill-generated
runoff, unless controlled. ^ Yes No ^
January 13, 2003 2
AGENDA ITEM #$B
JANUARY 27, 2003
' 9. Inlets on slopes use deflectors to prevent runoff bypassing, and all inlets on site
are well protected. ^ Yes No ^
' 10. Runoff from driveways is diverted into drainage system in order to prevent
direct discharge onto streets. ^ Yes No ^
' 11. There are adequate end treatments on all pipes. ^ Yes No ^
' ~ 12. There are energy dissipater structures at the outlets of all pipes under a large head
and at the end of paved flumes. ^ Yes No ^
13. There is information regarding any off site impacts anticipated as a result of the
' .proposed developments and means of which such impacts are to be mitigated.
^ Yes No ^
14. If no off-site impacts are anticipated, then a signed statement to that
effect is provided; and the dewatering operations turbidity readings shall
be <_ 29 ntu above natural background readings. Note, turbidity readings
must not be above background levels for Outstanding Florida Waters.
The Lat./Long. of discharge points, if any, are indicated. ^ Yes No^
15. Temporary (hay bales, silt fences, turbidity barriers, inlet sediment filters, block
and gravel inlet protection, fabric drop inlet protection, gravel construction
entrance, outlet protection, etc.) controls shall be placed at the proper designated
places -close to the source to minimize erosion and sedimentation.
^ Yes No ^
16. Each of the proposed erosion and sediment control measures is shown on the
appropriate designated location on the plan, and the construction/installation
detail for each of the proposed measures is depicted on the plan. ^ Yes No ^
17. The plan should fit the particular topography, soils, drainage patterns, and natural
vegetation of the site -internal grading to route all stormwater runoff through
' the designed drainage system. ^ Yes No ^
18. Descri tion of each control device its ose and an ex lanation of wh it is
P PuTP ~ P Y
' appropriate at a geographical location are provided. ^ Yes No ^
19. There is a note to the effect that a thorou h maintenance and com liance ro am
g P P b'r
will be implemented and all inspections will be recorded -inspection to be
completed every 7 days, and within 24 hours of a rainfall event of 0.50 inches or
more. ^ Yes No ^
20. There are adequate easements to accommodate maintenance and inspections.
^ Yes No ^
'
January 13, 2003 3
AGENDA ITEM #8B
JANUARY 27, 2003
21. The Stormwater Pollution Prevention Plan SWPPP has been
( )
completed, and it would be available for inspections by the regulatory
authorities. ^ Yes No^
' 22. For one acre or more (total plan of site development), a completed Construction
Generic Permit Notice of Intent (NOI) (FDEP Form 62-621.300(4)(b) would be
submitted to FDEP two days or more before the commencement of site's
activities. ^ Yes No^
NOTE: Failure to comply with erosion and sediment control rules and rebulations in a
' timely manner may result in PERNIIT VIOLATIONS, and ENFORCEMENT ACTIONS
may be taken by City Of Atlantic Beach, SJRtiVMD, FDEP, and United States EPA.
' Letters of Violations, Stop Work Orders, and Fines may be issued for Permit
Violations.
' Please contact our office at 904-247-5834 or by Fas at 904- 247-5843 for any NPDES
questions or concerns.
t BEST MANAGEMENT PRACTICE (BMP) IS A CONTROL TECHNIQUE USED FOR A GIVEN
SET OF CONDITIONS IN ORDER TO ACHIEVE WATER QUALITY AND QUANTITY
ENHANCEMENT AT A MINIMUM PRICE ($$$).
STRUCTURAL BMP +NON-STRUCTURAL BMP =MITIGATION + PREVENTION
' January 13, 2003
AVOID COSTLY FINES and STOP WORK ORDERS
4
DEPARTMENT OF PUBLlC WORKS
EROSION & SEDIIi 1IJNT CONTROL INSPECTION
Date
Project Name/Location _
Contractor's Name/Address
Stage of Construction
YES NO NA
^ ^ •^
^ ^ ^
^ ^ ^
^ ^ ^
^ ^ ^
o a ^
^ ^ ^
^ ^ ^
^ O
^ ^ ^
^ ^ ^
^ ^
12. All preservation wetlanJ and conservation areas arc clearly marked and adequately
protected from silt, erosion and turbidity.
13. All alumlwatcr treatment systems operating properly and coordinated with DPW.
14. Notice of Intent (NOI} (FDEP Form 62-G21.3011(~!)(b) has bcen submitted to FDEP.
^ ^
' ^ ^ ^
^ ^ ^
^ ^ ^
Comments:
15. The Stormwatcr Pollution Prevention Plan (SWPPP) is on situ
16. TM; required inspi~ction and maintcnancc report forms are always completed.
NOTE: Failure to comply with erosion and sediment control rules and regulations in a timely manner may result in PERMIT
VIOLATIONS, and ENFORCE'YIENT ACTIONS may be taken by City Of Atlantic Beach, SJRWbID, FDEP, anJ U.S. EPA.
Letters of Violations, Stop Work Orders, and Fines may be issued for Permit Violations.
Please contact Public Works Department ut 904 - 247-5834 or Fat 904 - 247-5843 for any questions or concerns.
VerbaUWritten notification given to:
Company
Inspector Signature
Time Permit # Inspector
1. All required erosion and sediment control measures are shown on plan.
2. All silt fences are properly installed (staked in and trenched in) and in good condition.
3. All disturbed areas are properly stabilucd. Temporary or permanent stabilization is required.
4. All dcwutering operations turbidity re~dingsare 5 2'J ntu above natural background readings.
Note, turbidity readings must not bcabove background levels for Outstanding Fiorida Waters.
5. All construction entrances arc tree from soil and mud tracking.
fi. All above ground water impoundments are stabilized.
7. All stormwatcr inlets are adequately protected from sediments.
8. All stormwater ponds and conveyance systems arc stabilized and free of sediments.
9. All receiving waters arc adequately protected with floating turbidity curtains or other
means as needed.
10. Sediment traps are installed :LS needed and arc in good working order.
11. All soli stockpiles are adcquatcly stabilized.
Phone#
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AGENDA ITEM #8B
JANUARY 27, 2003