20070001 Ver 1_Major Variance_20070620

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BRL ENGINEERING
7a4B bet Stealer Street
Four Oake, NC 2Tti24
pie~e~a-uaa
-~ 3 0 3 d ~-
June 18, 2007
Ms. Amy Chapman
Buffer Coordinator
NC Division of Water Quality -Central Office
2321 Crabtree Boulevard -Suite 250
Raleigh, NC 27604
Gl
~~~
JUN 2 0 200'1
Brian R. Leonard, PE, PIS
W~TW~ ~bS AND STORMINATER BRANCH
Re: Minor Variance Application AND Stormwater Management & Mitigation Plan
For Lot 31 in Carriage Hills Subdivision, In City of Raleigh
Dear Ms. Chapman:
1~ American Builders of Apex, NC plans to develop Lot 31 in Carriage Hills Subdivision. However,
due to Neuse River Riparian Buffer Rules (enacted after the development and recording of this
subdivision) and the constraints imposed by the Rules, this lot cannot be built upon without approval
of a Minor Variance which is required to construct impervious surfaces within Zone 2 of the Buffer.
Enclosed herewith for your review are the following documents:
1) Variance Request Form for Minor Variances -signed by applicant; w/USGS Quad
Map as Required
2) Stormwater Management Plan - 2 Copies on Half-Size Plansheets (includes
summary of Applicant Mitigation Plan)
3) Drainage Calculations for Stormwater Management Devices -1 Copy
4) Grass Swale ~ Level Spreader Worksheets - 1 copy each, initialed by myself as
agent for applicant
5) Grass Swale & Level Spreader Operation/Maintenance Forms -1 copy each, signed
by applicant and notarized
6) Pictures Showing Area of Level Spreader 8~ Buffer On-Site
Please note that this is a new submittal from a previous submittal that expired due to additional
information requested; however the Owner/Applicant name has changed. We had worked closely
with Ms. Annette Lucas on the initial submittal. I trust that this submittal includes all of the information
you will now need for approval; including a new design for the level spreader (according to the new
design standards published on NCDWQ's website). Our initial submittal did not require the new level
spreader standard; however, we believed we would likely be required to design it according to the
new standard and have now done so in this submittal.
As before, the "approach" to the Stormwater Management Plan is intended to capture runoff from
proposed impervious surfaces in Zone 2 of the buffer and direct it bads outside of both zones, making
it diffuse for full buffer treatment prior to entering the stream. Additionally, a grass swale has been
used as the conveyance device which will offer additional treatment prior to runoff entering the level
spreader. Please see the detailed informational notes on the Stormwater Management Plan and the
supporting design calculations.
p~-ooo- Y 2.

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Page 2 of 2
June 18, 2007
Ms. Amy Chapman
And finally, as before, the applicant has chosen to pay the required fee into the Ecosystem
Enhancement Program as his mitigation. The mitigation plan is described as follows:
1,950 ftz -Total Impact to Zone 2
x 1.5 -Multiplier for Zone 2 (15A NCAC 28.0242 (3)(b))
2,925 ftz -Total Adjusted Impact
x .96/ftz -Required Mitigation Fee Rate (15A NCAC 26.0242 (7)(a))
2.808.00 -TOTAL MITIGATION FEE
This mitigation plan is also summarized in the detailed notes on the Stormwater Management Plan.
On behalf of 1 ~ American Builders, I would appreciate your review of the attached information for the
BufFer Variance Request. Please contact me if you have any questions.
Sincerely,
~. - ~.
BRL ENGINEERING
Brian R. Leonard, PE, PLS
BRU1
Cc: Robert Shank
Linwood Byrd
Attachments: As Noted

.,
OFFICE USE ONLY: Date Received Request # __
State of North Carolina ~ ~ " O O ~ ( ~/
Department of Environment and Natural Resources
Division of Water Quality .~ ~ 3
Variance Request Form -for Minor Variances
Protection and Maintenance of Riparian Areas Rules
NOTE: This form maybe photocopied for use as an original.
Please identify which Riparian Area (Buffer) Protection Rule applies.
/ Neuse River Basin: Nutrient Sensitive Waters Management Strategy
Protection and Maintenance of Riparian Areas Rule (15A NCAC 02B
.0233)
^ Tar-Pamlico River Basin: Nutrient Sensitive Waters Management
Strategy Protection and Maintenance of Riparian Areas Rule (15A
NCAC 02B .0259)
^ Catawba River Basin: Protection and Maintenance of Existin Ri avian
Buffers (15A NCAC 02B .0243) ~ ~ ~ ~ Q V
007
Part 1: General Information DENR - WATER Quru.ITY
(Please include attachments if the room provided is insufficient.) ~ ^~ STOr~wAr~R sRa~cH
1. Applicant's name (the corporation, individual, etc. who owns the property): _ 1"American
Builders. i_LC
2. Print Owner/Signing Official (person legally responsible for the property and its compliance)
Name: Michael Dean Chadwic~: ~_ _ ~_
Title: __Mana~c er ! Agent.for_Applcant ______
Street address: _ 2514 Reliance Avenue-______ _
City, State, Zip: _ Apex. NC 27539__________~_i__~ ____v____ ___~_
Telephone: X919) 303-8525
Fax. [phone]...
3.
Contact person who can answer questions about the proposed project:
Name: Same as 2. Above
~.-- -
Telephone: ~------~-----_------------- ----------- ---
Fax: ~. _) ____--
Email:
- __-
4. Project Name (Subdivision, facility, or establishment name -consistent with project name on
plans, specifications, letters, operation and maintenance agreements, etc.):
Buffer Variance -_L.ot 31 n_Carra_ge Hills Subdivision_
Version 2: November 2002

r
5. Project Location:
Street address: Vacant Lot on Lantern Place ___
City, State, Zip: Raleigh, NC
County: Wake
Latitude/longitude: N 35 49 57.26 Latl_ W 73 42 8.10~Longl (See USGS Quad Mag) _
6. Directions to site from nearest major intersection (Also, attach an 8'/s x 11 copy of the USGS
topographic map indicating the location of the site):
_Traveling North on US 70 (Glenwood Av.? at the intersection with SR 3009 (Edwards Mill
__~o_ad}. just past Crabtree Mall, turn left onto SR 300 (Edwards._Mill Ro~_ Then aggrox.
1.6 mi. turn riq_ht onto Laurel Hills C~rive. Then approx. 0.15 mi. turn right onto Old Post Rd
Then turn at 21° right on Lanterr~ Place. Lot 31 is at end of culdesac.
7. Stream to be impacted by the proposed activity:
Stream name (for unnamed streams label as "UT" to the nearest named stream): "UT" to_
Crabtree Creek
---- - --_-----------------_ ---------------------------- ------------------
Stream classification [as identified within the Schedule of Classifications 15A NCAC 2B
.0315 (Neuse) or .0316 (Tar-Pamlico)]: _ Class C. NSW
8. Which of the following permits/approvals will be required or have been received already for
this project?
Required: Received: Date received
Permit Type:
CAMA Major
CAMA Minor
401 Certification/404 Permit
On-site Wastewater Permit
NPDES Permit (including stormwater)
Non-discharge Permit
Water Supply Watershed Variance
Others (specify) __ _~~~
Part 2: Proposed Activity
(Please include attachments if the room provided is insufficient.)
1. Description of proposed activity [Also, please attach a map of sufficient detail (such as a plat
map or site plan) to accurately delineate the boundaries of the land to be utilized in carrying
out the activity, the location and dimension of any disturbance in the riparian buffers
associated with the activity, and the extent of riparian buffers on the land. Include the area
of buffer impact in ftz.]: Proposed Residential Homesite (See Attacheri stormwater
Management Plan). Plan shows a maximum impact /worst-case scenario for building
footprints~im~ervious areas. and design_for s_tarmwater_devices.~__~^
TOTAL IM^PACT TO ZONE 2 OF BUFFER = 1950 Sq. Ft.
2. State reasons why this plan for the proposed activity cannot be practically accomplished,
reduced or reconfigured to better minimize or eliminate disturbance to the riparian buffers:
_ Uniess Encroachment to Zone 2 is allowed lot width on Lot 31 is not~ractical for tygical
___ home size after City setbacks are a~pcied. T_h_i_s_m_akes the lot virtuall~undevelo~~~able.
See Also Question # 4 Below.
Variance Request Form, page 2
Version 2: November 2000

3. Description of any best management practices to be used to control impacts associated with
the proposed activity (i.e., control of runoff from impervious surtaces to provide diffuse flow,
re-planting vegetation or enhancement of existing vegetation, etc.):
Grass Swale for initial treatment and to direct runoff back outside of Zone 2; then runoff
_~enters Level Spreader and is made diffuse prior to the entire_50' Buffer (outside of Zones
1 and 2). See Stormwater Management Plan and the detailed notes on the plan relating
_ to_th~ engineered designs. _ ~___ _ __~
4. Please provide an explanation of the following:
(1) The practical difficulties or hardships that would result from the strict application of this
Rule. As described in Question #2 above, the Lot would be virtually un-developable if
all built-u on areas were restricted beyond Zone 2 of the Buffer. This would drastical~
~de_value~ if not co~lete0y condemn, the property. _._,__ __
(2) How these difficulties or hardships result from conditions that are unique to the property
involved. _T_he Lot is dart of a subdivision that was developed and recorded prior to __
a adoption of theMeuse River_~i a~arian Buffer_Rules__Therefare,__._the_ lot was not laid. o~~_t_or
desi rc~~ed tc~ account for Riparian Buffers. ____~__________~_______. -____.___
(3) If economic hardship is the major consideration, then include a specific explanation of the
economic hardships and the proportion of the hardship to the entire value of the project.
The lots in the_neighborhood are selling for $80.000 each. This lot is potentially worthless
unless a variance. can be obtained to devela~. in Zone 2._ If Zone 2 is waivered the lot can
built upon and. marketed for sale; although the lot v±rould probably not bring the cam arable
_ nei hbarhood value dui tg the restricted buildable width that is rno_re narr~o~v_tha_n_ a __
standard lot___
Part 3: Deed Restrictions
By your signature in Part 5 of this application, you certify that all structural stormwater best
management practices required by this variance shall be located in recorded stormwater
easements, that the easements will run with the land, that the easements cannot be changed or
deleted without concurrence from the State, and that the easements will be recorded prior to the
sale of any lot.
Part 4: Agent Authorization
If you wish to designate submittal authority to another individual or firm so that they may provide
information on your behalf, please complete this section:
Designated agent (individual or firm): Brian R_Leonard, BRL Engineering
Mailing address: __`v_~704-B East Stanle .Street _
City, State, Zip: Four Oaks NC 27524
Telephone: ~_~~_. 919 963-2608 ____ _
Fax: __~ 919 963-3736 __ __
Email: .__~~_~,_brlengineerin ~earthlink.net_ _______ _____.______
Variance Request Fonn, page 3
Version 2: November 2000

r
Part 5: Applicant's Certification
I, Michael Dean Chadwick (print or type name of
person listed in Part I, Item 2), certify that the information included on this permit application form
is correct, that the pro'ect will be constructed in conformance with the approved plans and that
the deed restricti s in a cor nce wj#h Pa~3 of this form will be recorded with all required
permit conditi ~. ~ ~/
Signature: ~~~~'~- /~
Date: ------- `" ~-=-~ _-_-_--_-- --
Title: ~Manac~er (A~ent for ~iicant ~~
Variance Request Form, page 4
Version 2: November 2000

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Name: RALEIGH WEST Location: 035° 49' 48.6" N 078° 42' 11.94" W
Date: 12/27/2006
Scale: 1 inch equals 2000 feet ~ ``^~ ~^f°~~~ t'~^° ~ ~" r u 3s' 99' s2.~s"
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O`1-oo0l '~2.
GRASS SWALE OPERATION AND MAINTENANCE AGREEMENT
The grass swale is defined as an open runoff conveyance device, similar to a ditch, but with flat slopes and
side-slopes and soils that are suitable for infiltration. The device is designed for Iow velocities and may
utilize impedance devices to promote infiltration.
Maintenance activities shall be performed as follows:
1. After construction and until vegetation has been established, grass swale(s) shall be inspected
after every rainfall. Thereafter, grass swale(s) shall be inspected at least every month and more
frequently during the fall season and after heavy rainfall events:
a. At least once annually, remove excess sediment, especially from the upstream edge, to
maintain original contours and grading;
b. At least once annually, repair any erosion and regrade the swale(s) to ensure that the
runoff flows evenly in a thin sheet through the swale(s);
c. At least once annually, inspect vegetation and revegetate the swale(s) to maintain a dense
growth of vegetation;
d. Grassed swale(s) shall be mowed at least twice annually to a maximum height of six (6)
inches.
The Contractor should avoid the placement of any material on and prevent construction traffic
across the structure. If the measure is damaged by construction traffic, it shall be repaired
immediately.
Inspect and repair any stormwater conveyance. devices upstream and downstream four times a
year to maintain proper functioning.
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.
Applicant: IS` American Builders. LLC
Agent: Michael Dean Chadwick
Title: Man eag r /Agent for Applicant
named president. For single-lot development or sites, the legally responsible party shall be the person or
entity named above, but legal responsibility may be transferred with the land by a legally binding
agreement or transfer of rights.
I, ~Caarhex~ f~G C.. ~...u8~ , a Notary Public for the State of 1~Ior~h C.aro`irto... ,
County of _ y~~k¢,._ , do hereby certify that f Y1i t..~'1A e,~ p'~atr1, C.~'Y~.C~ ~.c~ ~ C~C.-
personally appeared before me this 13~ day of ~t,~X1e,, ,~~C'7 ,and acknowledge the due
execution of the forgoing Grass Swale maintenance requirements. Wi ess my,,h~,an~yd hand office s '1,
,.~~'< •.•''`~~•~'''• My commission expires ~
~ ~~o~:A~y Ka~her~ne. C, LuslC-
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Note: For multi-lot residential subdivisions, 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

LEVEL SPREADER SYSTEM OPERATION AND MAINTENANCE AGREEMENT (1/2007)
A level spreader system includes: a forebay, diverter box, level spreader, riparian buffer/vegetated filter strip,
and flow bypass channel. jNOTE: Forebay diverter box, and flow bypass not required on this project)
Name of Project: Buffer Variance for Lot 31 in Carriage Hills Subdivision
Address: Vacant Lot on Lantern Place, Raleigh NC
Maintenance activities shall be performed as follows:
MAINTENANCE ACTNITY FREQUENCY
Post-construction monitoring-inspect for vegetation, Check after every heavy rainfall for first 6 months
settlin ,erosion, or concentrated flow. followin construction.
Inspect Diverter Box and clean and/or make repairs. Once a month and after heavy rainfalls/storms.
Look for:
• Clogged inlet or outlet pipes.
• Trash/debris in the box.
Inspect Forebay + Level Spreader. Clean and/or Once a month and after heavy rainfalls/storms.
make repairs. Look for:
• Sediment in forebay and along level spreader
lip;
• Trash and/or leaf buildup.
• Scour, undercutting of level spreader.
• Settlement of level spreader structure (no
longer level; you see silt downhill below level
spreader).
• Fallen trees on level spreader.
• #57 stone washin downhill.
Inspect the Riparian Buffer and the Bypass Swale Once a month and after heavy rainfalls/storms.
and make repairs as needed'. Look for:
• Damaged turf reinforcement or riprap rolling
downhill
• Erosion within the buffer or swale.
• Concentrated flows downhill of level
s reader-look for ullies or sediment flows.
Mow grass to a 6" height. As needed during growing season.
Remove any weeds/shrubs growing on level spreader Once a year.
or in swale.
1 NOTE: Contact NC Division of Water Quality, 401/Wetlands Unit at 919-733-1786 BEFORE any work
in Protected Riparian Buffers.
Page 1 of 2

LEVEL
SPREADER NO. LOCATION ON SITE (DESCRIBE) HOW WILL IT BE ACCESSED?
1 Back of Proposed Lot Internal from the Proposed Lot
2
3
4
5
6
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.
Applicant: 1St American Builders, LLC
Agent: Michael Dean Chadwick
Title: Manager /Agent for Applicant
AddrE
Phon
Sign
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. For single-lot
development or sites, the legally responsible party shall be the person or entity named above, but legal
responsibility may be transferred with the land by a legally binding agreement or transfer of rights.
I, F~a~rir~e-- C . ~...v~,s~ , a Notary Public for the State of 1~or~ C~o~~ na.,
County of 1~~.~e. , do hereby certify that ~l;c~ac~ D~ C..-~uc~~ic.~-
personally appeared before me this t 3~` day of ~wr1~ , ~©p1 ,and acknowledge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal, l~ . ,.. J,
~ti~` BRINE C ~°~e.
~ n ~.. -._
t ~ pC18L1~ s
ti
l ~~~t~i rVt rtiJ~~i ~ ~i i. ~i'• ~ .
SEAL

My commission expires o2~
Page 2 of 2

O1- ODO ~ ~/'2
DRAINAGE CALCULATIONS
FOR
STORMWATER MANAGEMENT DEVICES (BMP's)
BUFFER VARIANCE FOR
LOT 31 IN CARRIAGE HILLS SUBDIVISION
in
CITY OF RALEIGH, NC
~ BRL ENGINEERING
7046 East Stanley Street
Four Oaks, NC 27524
° Office: [phone]
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Worksheet
Worksheet for Trapezoidal Channel
Project Description
Worksheet 02 Grass Swale p-F_V .E- GticclL QZ ~%~st S; ~« J~-%s Is G<w~!/ !~r rL D/~~'%c~/t to S~}%~ry
Flow Element Trapezoidal Cha ~ 1~k"^ ~'~P I
Method Manning's Forma
Solve For Channel Depth
Input Data
Mannings Coeffic 0.030 ~ G~dss ~C. ^ st-v-~ 1
Channel Slope 010000 ft/ft E- dcs%~-, Slopc = . S>- fo 1.07. - vyzd ~4x ~ ('C.^r~~~-/
Left Side Slope 3.00 H : V
Right Side Slope 3.00 H : V
Bottom Width 2.00 ft ~-- r-tr., pis%~~61~ dust
Discharge 1.03 cfs
Results
Depth 0.24 ft
Flow Area 0.6 ft2
Wetted Perim 3.50 ft
Top Width 3.42 ft
Critical Depth 0.18 ft
Critical Slope 0.025370 ft/ft
Velocity 1.60 ft/s
Velocity Head 0.04 ft
Specific Ener< 0.28 ft
Froude Numb 0.65
Flow Type 3ubcritical
~-- cZ.o /}Il...,,blc .: Gr.ss ak ~ ,vo L%~,1} Q~~,,.,.~d. Cock Q,o !;~F.os,e.,..,
Notes: 02 Grass NO Lining: Best Section (Slope; Base; & Sideslopes) By Trial & Error to Keep Q2 < 2 ft/sec
Project Engineer: Brian Rentz Leonard
c:\...\designklitches\106015-01-dRches.fm2 BRL Engineering FlowMaster v7.0 [7.0005]
04/05/07 05:48:28 PM ®Haestad Methods, Inc_ 37 Brookside Road Waterbury, CT 06708 USA [phone] Page 1 of 1

Worksheet
Worksheet for Trapezoidal Channel
Project Description
Worksheet 010 Grass Swalc keV
Flow Element Trapezoidal Cha
Method Manning's Form
Solve For Channel Depth
Input Data
ManningsCoeffic 0.030 ~ G~tss ~l.-,svv.,
Channel Slope 010000 ft/ft ~-- das%!-+ Si-pc = . S"). t• /•o~. , vJ~d Mt>r
Left Side Slope 3.00 H : V
Right Side Slope 3.00 H : V F! ~q L Q ESl6-N SF-G T )oti! SSG 8c/c w
Bottom Width 2.00 ft
Discharge 1.28 cfs
Results
Depth 0.27 ft
Flow Area 0.7 ft2
Wetted Perimi 3.69 ft
Top Width 3.60 ft
Critical Depth 0.21 ft
Critical Slope 0.024432 ft/ft
Velocity 1.71 ft/s E -- V« 4-S
Velocity Head 0.05 ft `~°"
All.w~blt
Specific Enerc 0.31 ft ~%~ ~"S'
Froude Numb 0.66
Flow Type 5ubcritical

Notes: 010 Grass NO Lining: Best Section (Slope; Base; ~ Sideslopes) By Trial ~ Error to Keep 010 < 4.5 ft/sec
FINAL SLOpE
___--
To p
Gol~STANT
StofE OEPTN
vStd Sprf l t/~-` D. S
a ., f. I ~,. _ ..~ ~..:~ i, j
Slept - I- EV G~f~o9
FINAL SEc7"/o-~
i ~.~~-~.
~' ~ ~ ~
~Z ,-t
Spcu~f"~: ,~C.~st~--~ Slo~c - !'t;.,.0~p/L+„
Project Engineer: Brian Rentz Leonard
c:\...klesignklitches\106015-01-ditches.fm2 BRL Engineering FlowMaster v7.0 [7.0005]
04/05/07 05:48:44 PM ®Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 USA [phone] Page 1 of 1

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