20070001 Ver 1_Stormwater Plans_20061228 (134)

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 low 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.
2. 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.
3. 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.
Print Name: Ross W. Lampe
Title: Current Owner - Lot 31 in Carriage Hills Subdivision
Address: 235 Market Street, Smithfield, NC 27577
Phone: 9192a! ?95 n
Signature: \?/G• rJ?sy???_
Date: Z_ d
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
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.
a Notary Public for the State of
County of do hereby certify that Xyzo u/ .. a7 personally appeared before me this V day of 2? v , and acknowledge the due
execution of the forgoing Grass Swale maintenance requirements. Witness my hand and official seal,
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LEVEL SPREADER OPERATION AND MAINTENANCE AGREEMENT
The level spreader is defined as an elongated, level threshold, designed to diffuse stormwater runoff.
Maintenance activities shall be performed as follows:
1. After construction and until vegetation has been established, level spreader(s) shall be inspected
after every rainfall. Thereafter, level spreader(s) shall be inspected at least every month and
more frequently during the fall season and after heavy rainfall events:
a. Accumulated sediment, leaves, and trash shall be removed, and repairs made if required;
b. Inspect level spreader(s) for evidence of scour, undercutting, settlement of the structure,
and concentrated flows downhill from the level spreader(s);
c. A level elevation shall be maintained across the entire flow-spreading structure at all
times. Repair or replace the level spreader if it is damaged;
d. Mow vegetative cover to a height of six (6) inches and prune plants if they cover over
half of the level spreader surface;
e. Repair eroded areas and replace/replant dead or damage vegetation.
2. 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.
3. Inspect and repair the collection system (e.g., catch basins, pipes, swales, rip rap) four (4) 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.
Print Name: Ross W. Lampe
Title: Current Owner - Lot 31 in Carriage Hills Subdivision
Address: 235 Market Street Smithfield NC 27577
Phone: 919:;9 , x1-Er- i)
Signature: ( c ?
Date: ?'-- d 6
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
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.
a Notary Public for the State of
County of 4?;e,--"- , do hereby certify that n;"
personally appeared before me this Z f day of ????• 2U Co , and acknowledge the due
execution of the forgoing Level Spreader maintenance requirements. Witness my hand and official seal,
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My commission expires
DWQ Project No.
DIVISION OF WATER QUALITY - GRASSED SWALE WORKSHEET
1. PROJECT INFORMATION (please complete the following information):
Project Name : A v rrFA V4 p /q iuc s - L. -r 21 /,v GfR.d'-e,AGF HrtLS S/6
Contact Person: 94,5:s L 4m,6E Phone Number: (9 9) 5'34 - /'I ys-
SwalelD: n???le p-?p?sr/ -, t?1. 31
Grass Swale Length
Tributary Drainage Area
Impervious Area
Max. Velocity from 2 Yr. Storm
Max. Velocity from 10 Yr. Storm
Min. side slopes
Steepest Effective Slope
Cover Crop
©- zs ac.
o- d+7s ac.
L IS- fps
0 YO fps
i ratio
d-o1 ft/ft
T,tr.L ?CYE J-- A WAMWbA
(at least 100 ft. per tributary acre)
(on-site and off-site drainage to the swale)
(on-site and off-site drainage to the swale)
(2 fps max.)
(3:1 min.)
(check dams may be used)
II. REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a
requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes
a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed
drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for
additional information and will substantially delay final review and approval of the project.
ADDlicants Initials
Vegetation Plan provided on plans
The underlying soils are permeable and non-compacted Tip. Z e..4.3' 11h,
aAIX Swale carries only stormwater flow svrls pC° ><•is Mo
G&V_ Water table depth is greater than 1 foot. -ryp. > j. ° f, Lo _-l E somas ,ev CO.-,firs®. rig=p
L Plan details for the swale provided.
o Plan details for the inlets and outlets are provided.
S' Check dams provided.
The operation and maintenance agreement includes annual erosion and vegetation repair, and at least twice
annual mowing.
The operation and maintenance agreement signed and notarized by the responsible party is provided.
DWQ Project No.
DIVISION OF WATER QUALITY - LEVEL SPREADER WORKSHEET
1. PROJECT INFORMATION (please complete the following information):
Project Name : BurFrA Vg414"C9 L- La•r 31 /tit LAAA1-44,9 liizts SID
Contact Person: tress LgmPJ5 Phone Number: ( yl y) 934 -io195'
Level Spreader ID:. Dn/r "v-el Spica lcr P?opcs?rl cwt 31
Level Spreader Length 7-s- ft. (perpendicular to flow)
Drainage Area D-25- ac. (on-site and off-site drainage to the level spreader)
Impervious Area 0-n-7s ac. (on-site and off-site drainage to the level spreader)
Maximum Filter Strip/Buffer Slope 89d M•'x % (6% for forested, leaf littler cover, 8% for thick ground cover)*
grass " Ex+sfi• A?rlk.- dl ."se ze-0,7. 6y GISC?.,??Yrs nn? d",ehloblr ?'af??
Max. Discharge from a 10 Year Storm o- 94 cfs
Max. Discharge to Level Spreader 0? 94 cis
Filter Strip/Buffer Vegetation ThirkGYO-•-./ 'C., V-"-
(thick ground cover or grass, canopied forest with'leaf litter
groundcover)
Pre-treatment or Bypass Method t4h
II. REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a
requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes
a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed
drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for
additional information and will substantially delay final review and approval of the project.
ADDlicants Initials
a! r Level spreader is at least 13 ft. per cfs for thick ground cover or grass or 100 ft per cfs in canopied forest with leaf
litter.
NSA Pre-Form Scour Holes are on flat slopes only
Sic IVvt'E &lo? No structures are located in protected buffers*
If bypass method specked in the Draft Level Spreader Design Option Document:
J?Vee Bypass method is specified (if applicable) and plan details and calculations are provided
Ay--e, Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the bypass
discharge.
No structures are located in protected buffers.
btu Plan details for the bypass and outlets are provided.
The operation and maintenance agreement includes annual erosion and vegetation repair.
The operation and maintenance agreement signed and notarized by the responsible party is provided.
* Level spreaders in series can be used on slopes of up to 15°x6 in forested areas with leaf littler cover or on slopes of up to 25% in areas
with thick ground cover or grass if designed according to the Draft Level Spreader Design Option Document. This potentially requires a
minor variance in protected buffer areas. In any event the second level spreader cannot be located in Zone 1 of a protected buffer area.
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