20090566 Ver 1_Stormwater Plans_20091105

MCKIM&CREED
TO: NCDENR - DWQ
2321 Crabtree Boulevard
Raleigh, NC 27699
ATTENTION: Ms. Annette Lucas
o? - u?LDU
LETTER OF TRANSMITTAL
DATE: November 5, 2009
PROJECT NO: 01517_0194 TTASK NO:
RE: Caterpillar Product Development Center
TRANSMITTAL NO: PAGE 1 OF 1
WE ARE SENDING: ? Originals ® Prints ? Shop Drawings ? Samples
? Specifications ? Calculations ® Other
Quantity Drawing No. Rev Description Status
2 Plan Set for BMP's and Erosion Control Drawings
2 Level Spreader supplements
2 Level Spreader O&M Agreements (originals) .,

,ov 521 09
QENR • WATER Wgny
1LAWS AND STORMWATEq SRAlO
REMARKS: Hi Annette,
Please find the enclosed information that you requested for the Caterpillar Core PDC site
supplemental to the 401 approval. Please let us know if you need any additional
information, or if you have any questions.
1730 Varsity Dr., Suite 500, Raleigh, NC 27606 919/233-8091 Fax [phone]
Cc:
McKIM & CREED, PA
Signed
Gareth Avant, EI
v
v MCKIM&CREED
ENGINEERS
S U R V E Y O R S
November 3, 2009
Ms. Annette Lucas
NCDENR - DWQ - 401 Permitting Unit
2321 Crabtree Blvd, Suite 250
Raleigh, NC 27604
P L A N N E R S
Q???aei?D
kOV 5 2009
RE: Caterpillar Access Road comments WETLA*73 AB M
Ms. Lucas:
In response to your comments received, we have revised the enclosed plans and
we offer the following responses below. Original comments are shown in
BOLD.
1. Please provide a BMP Supplement Form and O&M Agreement for each
proposed level spreader.
A BMP Supplement Form, along with O&M Agreement has been provided
for each proposed BMP. Please note that the level spreader for BMP #1 has
already been installed on the site. The bypass design that we have shown
within the flared end section is a retrofit that we are proposing. Upon
approval, we will issue the contractor to make the corrections in the field.
Since BMP #2 has not been constructed, the level spreader and bypass
arrangement for has been designed to conform to NCDENR's requirments at
the time that it will be constructed.
*Note. The downstream condition of level spreader #2 is heavily wooded and
essentially is the same as the downstream condition at the location of level
spreader # 1 (photo included).
If you have any questions during your review, please do not hesitate to give me a
call at 919.233.8091. Thank you for your help.
Sincerely,
Venture 1V Building MCKIM & CREED, P.A.
Suite 500
1 730 Varsity Drive
Gareth Avant, El, LEED AP
R a l e i g h , NC 2 7 6 0 6 Engineer Intern
9 1 9 . 2 3 3 . 8 0 9 1 Attachments: - 2 sets of REVISED sheets- C2101, C2102, C2103, C2104
Fax [phone]
www.mckimcreed.com
_AIWA
NCDENR
??F W A7g9
o ?
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely filled out, printed and submitted.
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)!
L PROJECT INFORMATION
Project name Caterpillar Core PDC Site
Contact name Gareth Avant, McKim & Creed, PA
Phone number 919.233.8091
Date October 15, 2009
Drainage area number #1
II. 'DESIGM INFORMATION
For Level Spreaders Receiving Flow From a BMP
Type of BMP Wet Detention Pond
Drawdown flow from the BMP 0.09 cfs
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area
Impervious surface area
Percent impervious
Rational C coefficient
Peak flow from the 1 in/hr storm
Time of concentration
Rainfall intensity, 10-yr storm
Peak flow from the 10-yr storm
Where Does the Level Spreader Discharge ?
To a grassed bioretention cell?
To a mulched bioretention cell?
To a wetland?
To a filter strip or riparian buffer?
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass
Width of dense ground cover
Width of wooded vegetation
Total width
Elevation at downslope base of level lip
Elevation at top of bank of the receiving water
Slope (from level lip to to top of bank)
Are any draws present?
Level Spreader Design
Forebay surface area
Feet of level lip needed per cfs
Answer "Y" to one of the following:
Length based on the 1 in/hr storm?
Length based on the 10-yr storm?
Length based on the BMP discharge rate?
Design flow
Is a bypass device provided?
Do not complete this section of the worksheet.
ft2 Do not complete this section of the worksheet.
ft2 Do not complete this section of the worksheet.
% Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
cfs Do not complete this section of the worksheet.
min
in/hr Do not complete this section of the worksheet,
cfs Do not complete this section of the worksheet.
(Y or N)
(Y or N)
(Y or N)
Y (Y or N) Please complete filter strip characterization below.
ft
ft
50.00 ft
50.00 ft
202.00 fmsl
200.00 fmsl
4.00 % OK
N (Y or N) OK
sq ft No forebay is needed.
65 ft/cfs
Y (Y or N)
(Y or N)
(Y or N)
cfs
Y (Y or N) OK
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Parts I. and ll. Design Summary, page 1 of 2
Length of the level lip
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
y
Peak velocity in the channel during the 10-yr storm
Channel lining material
20.00
N
N
NIA
13.71
ft
(Y or N)
#VALUE!
(Y or N)
(Y or N)
ft 15YPAs5 f'IPR o?TC tU
ft
ft J4Pr" PAI*M4Y 5feq_lp
ft 1z 1 P FRA.P ouTte-(- PAi7
cfs

t ---
M

? t
M
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Parts I. and II. Design Summary, page 2 of 2
III. REQUIRED ITEMS CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Pagel Plan
Initials Sheet No.
4--A- 42101 1. Plans (1" - 50' or larger) of the entire site showing:
Design at ultimate build-out,
Off-site drainage (if applicable),
Delineated drainage basins (include Rational C coefficient per basin),
Forebay (if applicable),
High flow bypass system,
Maintenance access,
Proposed drainage easement and public right of way (ROW), and
Boundaries of drainage easement.
6CA eZ e'l 2. Plan details (1" = 30' or larger) for the level spreader showing:
Forebay (if applicable),
High flow bypass system,
One foot topo lines between the level lip and top of stream bank,
Proposed drainage easement, and
- Design at ultimate build-out.
_ ?ZI o2- 3. Section view of the level spreader (1" = 20' or larger) showing:
Underdrain system (if applicable),
Level lip,
Upslope channel, and
Downslope filter fabric.
4kA A 4. A date-stamped photograph of the filter strip that clearly shows the type of vegetation that is present.
644, Gt2oll 5. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
64.4 4 t 6. The supporting calculations.
666V_
&_1 AmA a&w-# 7. A copy of the signed and notarized operation and maintenance (0&M) agreement.
444 m A 8. A copy of the deed restrictions (if required).
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Part III, page 1 of 1
ti
Permit Number:
(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 sputter device is Unclog the conveyance and dispose
(if applicable) clogged. of an sediment off-site.
The flow splitter device is Make any necessary repairs or
damaged. replace if damage is too large for
repair.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 1 of 3
N
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
application.
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: Caterpillar Core PDC Site
BMP drainage area number:
Print name: OSE t M l LAVl;5L.b FOO
Title: ALIf' 11 MANA6,Ef,
Address:
Phone: 132
Signature: Q A
i
Date:
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?vr 1. /f ?? ' , a Notary Public for the State of
IQ A CQ ro /.,q?_ , County of do hereby certify that
LlinA elj Po-o l-{ personally appeared before me thisrz2r
day of OEk_. 6U , and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance, requirements.
Witness my hand and official seal,
My Commission Expires
March 7, 2011
My commission expires.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 3
.?? ?o>r wArF9v
p <
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely filled out, printed and submitted.
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)I
L PROJECT INFORMATION
Project name Caterpillar Core PDC Site
Contact name Gareth Avant, McKim & Creed, PA
Phone number 919.233.8091
Date October 15, 2009
Drainage area number #2
ll. DESIGN' INFORMATION
For Level Spreaders Receiving Flow From a BMP
Type of BMP Wet Detention Pond
Drawdown flow from the BMP 0.07 cfs
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area
Impervious surface area
Percent impervious
Rational C coefficient
Peak flow from the 1 in/hr storm
Time of concentration
Rainfall intensity, 10-yr storm
Peak flow from the 10-yr storm
Where Does the Level Spreader Discharge ?
To a grassed bioretention cell?
To a mulched bioretention cell?
To a wetland?
To a filter strip or riparian buffer?
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass
Width of dense ground cover
Width of wooded vegetation
Total width
Elevation at downslope base of level lip
Elevation at top of bank of the receiving water
Slope (from level lip to to top of bank)
Are any draws present?
Level Spreader Design
Forebay surface area
Feet of level lip needed per cfs
Answer "Y" to one of the following:
Length based on the 1 in/hr storm?
Length based on the 10-yr storm?
Length based on the BMP discharge rate?
Design flow
Is a bypass device provided?
ft2
ftz
cfs
min
in/hr
cfs
Do not complete this section of the worksheet
Do not complete this section of the worksheet
Do not complete this section of the worksheet
Do not complete this section of the worksheet
Do not complete this section of the worksheet
Do not complete this section of the worksheet
Do not complete this section of the worksheet
Do not complete this section of the worksheet
(Y or N)
(Y or N)
(Y or N)
(Y or N)
To forested area across property line
ft
ft
ft
ft
fmsl
fmsl
(Y or N)
sq ft No forebay is needed.
ft/cfs
Y (Y or N)
(Y or N)
(Y or N)
0.07 cfs
Y (Y or N) OK
#VALUE!
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Parts I. and II. Design Summary, page 1 of 2
Length of the level lip
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
y
Peak velocity in the channel during the 10-yr storm
Channel lining material
20.00 ft
N (Y or N)
#VALUE!
N (Y or N)
N/A (Y or N)
ft L3N PASS P (f a 04 Vt Fws n>
ft
ft A4'PQo YR??'I?q( St?-r. r7
ft EZI P 2/4P p (ATLA-- -r PA _
34.42 cfs

------------
M
i B i
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5
1
M
Parts I. and II. Design Summary, page 2 of 2
II(. REQUIRED ITEMS CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Pagel Plan
Initials Sheet No.
.t c2103 1. Plans (1" 50' or larger) of the entire site showing:
Design at ultimate build-out,
Off-site drainage (if applicable),
Delineated drainage basins (include Rational C coefficient per basin),
Forebay (if applicable),
High flow bypass system,
Maintenance access,
Proposed drainage easement and public right of way (ROW), and
Boundaries of drainage easement.
4ge-A CZ 1 03 2. Plan details (1" = 30' or larger) for the level spreader showing:
Forebay (if applicable),
High flow bypass system,
One foot topo lines between the level lip and top of stream bank,
Proposed drainage easement, and
- Design at ultimate build-out.
Gtr G2tCy 3. Section view of the level spreader (1" = 20' or larger) showing:
Underdrain system (if applicable),
- Level lip,
Upslope channel, and
Downslope filter fabric.
6GA A raj 4. A date-stamped photograph of the filter strip that clearly shows the type of vegetation that is present.
64A elzol 5. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
d-e-A 4 6. The supporting calculations.
6,eA s?nac4w,-) 7. A copy of the signed and notarized operation and maintenance (0&M) agreement.
44A N1A 8. A copy of the deed restrictions (if required).
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Part III, page 1 of 1
Permit Number:
(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 sputter device is Unclog the conveyance and dispose
(if applicable) clogged. of an sediment off-site.
The flow sputter device is Make any necessary repairs or
damaged. replace if damage is too large for
re air.
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
application.
Trees or shrubs have begun Remove them.
to grow on the swale or just
downslo a 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:Caterpillar Core PDC Site
BMP drainage area number: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.
a Notary Public for the State of
County of do hereby certify that
personally appeared before me this
day of 67d-, be r- G , and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance re ments.
Witness my hand and official seal,

SEAL
'.Ay Commission Expires
March 7, 2011
My commission expires
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 3
Print name:_ )IS?PJI ? _? J A!(-&Z -POPf,E
Title: 104A14W,\
Address: QSy 9??r% 1- L4q-JIV A L 7
?AJ