20090430 Ver 1_More Info Received_20091201

Ph community infrastru
December 1, 2009
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cture consultants
@ RE 0 19 [A 50
L D=C ' 2009
DENR - WATER QUALITY
WETLM AND STORMWATER BRANCH
Ms. Cyndi Karoly
Division of Water Quality
401 Wetlands Unit
2321 Crabtree Blvd., Suite 250
Raleigh, NC 27604
RE: BMP Operations and Maintenance Agreements for Johnston County Airport Runway Safety
Area and Corporate Area Development Stormwater Plan (DWQ Project #09-0430)
Dear Ms. Karoly:
Attached to this letter is the original signed and notarized BMP Operations Agreements in support of
the Johnston County Airport Application for Individual 401 Water Quality Certification. I have also
included four copies of these agreements. Please contact me if you have any questions regarding this
submittal ([e-mail]). Thank you for your prompt attention to this important aviation
project.
Sincerely,
W.K. Dickson f&& Co., Inc.
Daniel Ingram
Project Scientist
cc: Thomas Brown, USACE
Ray Blackmon, Johnston County Airport
Carroll Triplett, WK Dickson
Chastity N. Clark, NCDOA
Project file, 80324.00.CA
not;t 0 (lof)I?Ia11i s
Permit Number: O q- 043 0
(to be provided by DWQ)
Drainage Area Number:
Filter Strip, Restored Riparian Buffer and Level Spreader
Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important maintenance procedures:
- Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
- Once a year, the filter strip will be reseeded to maintain a dense growth of
vegetation
- Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
- Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC,1993). Forested filter strips do not require this type of maintenance.
- Once a year, the soil will be aerated if necessary.
- Once a year, soil pH will be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of operation and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How I will remediate the problem:
The entire filter strip Trash/debris is present. Remove the trash/debris.
system
The flow splitter device The flow splitter device is Unclog the conveyance and dispose
(if applicable) clogged. of ansediment off-site.
The flow sputter device is Make any necessary repairs or
damaged. replace if damage is too large for
repair.
i?E , 2n9
DENR . WATFR QUAt;Ty
VVETIRCS AND STO(t4lyy4TER BRANCH
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 1 of 3
BMP element: Potential problem: How I will remediate the problem:
The swale and the level The swale is clogged with Remove the sediment and dispose
lip sediment. of it off-site.
The level lip is cracked, Repair or replace lip.
settled, undercut, eroded or
otherwise damaged.
There is erosion around the Regrade the soil to create a berm
end of the level spreader that that is higher than the level lip, and
shows stormwater has then plant a ground cover and
bypassed it. water until it is established. Provide
lime and a one-time fertilizer
a lication.
Trees or shrubs have begun Remove them.
to grow on the swale or just
downslo e of the level lip.
The bypass channel Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then
reestablish proper erosion control.
Turf reinforcement is Study the site to see if a larger
damaged or ripap is rolling bypass channel is needed (enlarge if
downhill. necessary). After this, reestablish
the erosion control material.
The filter strip Grass is too short or too long Maintain grass at a height of
if applicable). approximately three to six inches.
Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
Sediment is building up on Remove the sediment and
the filter strip. restabilize the soil with vegetation if
necessary. Provide lime and a one-
time fertilizer application.
Plants are desiccated. Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application.
Nuisance vegetation is Remove vegetation by hand if
choking out desirable species. possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality local Regional Office, or the
outlet. 401 Oversight Unit at 919-733-1786.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 2 of 3
Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name: Johnston County Airport - Corporate Area Development Project
BMP drainage area number:Filter Strip #1 & #4A (see attached plan)
Print name:John H. Bullock, Jr
Title: Chairman, Johnston County Airport Authority
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
I, I-j P l e h L. 5 f 11'1 YYt [?1 , a Notary Public for the State of
F\ y V+E? CG t y GC n. c,, , County of ?noh y))4 yy.' , do hereby certify that
?('?', F) • ?` -i "In personally appeared before me this
day of ??! u e wi n,Y ) Q , and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
?SIMoi/.
?N ?v y
NOTARY =
PUBLIC
OlII11! ????
SEAL
My commission expires n1 , l S , a
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 3
Address:3149 Swift Creek Road; Smithfield, NC 27577
Permit Name:
(to be provided by DWQ)
Drainage Area Number:
Grassed Swale Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important maintenance procedures:
- The drainage area of the grassed swale will be carefully managed to reduce the
sediment load to the grassed swale.
- After the first-time fertilization to establish the grass in the swale, fertilizer will
not be applied to the grassed swale.
The grassed swale will be inspected once a quarter. Records of operation and
maintenance will be kept in a known set location and will be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How I will rernediate the problem:
The entire length of the Trash/ debris is present. Remove the trash/ debris.
swale
Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then re-sod
(or plant with other appropriate
species) and water until established.
Provide lime and a one-time
fertilizer application.
Sediment covers the grass at Remove sediment and dispose in an
the bottom of the swale. area that will not impact streams or
BMPs. Re-sod if necessary.
Vegetation is too short or too Maintain vegetation at a height of
long. approximately six inches.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality 401 Oversight Unit at 919-
outlet. 733-1786.
Form SW401-Grassed Swale O&M-Rev.3 Page 1 of 2
Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name: Johnston County Airport - Corporate Area Development Project
BMP drainage area number:Grass Swales 41 through 47 (see attached plan)
Print name:John H. Bullock, Jr.
Title: Chairman, Johnston County AiKport Authority
Address:3149 Swift Creek Road; Smithfield, NC 27577
I, ?1 e ( e h L. Si rn rnC a Notary Public for the State of
61 ? Cmv C ; v% n , County of '0 h V1 UVV , do hereby certify that
3 6 111 ?I • c ?;, i? personally appeared before me this I`
day of ??? u c m h w , 2 00 , and acknowledge the due execution of the
forgoing grassed swale maintenance requirements. Witness my hand and official seal,
iS 14 j?l
NOTARY
PUBLIC
IIII? N`
SEAL
My commission expires P u ff. d Y,) 0) k-
Form SW401-Grassed Swale O&M-Rev.3 Page 2 of 2
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.