20120669 Ver 2_More Info Received_20120829

704 -6 East Stanley Street
Four Oaks, NC 27524
919 963 -2608 (Office)
919 963 -3736 (Fax)
iI rdt 1 1 6:" 11 1 1 k ?� �-O' —
To: Lauren Witherspoon From: Brian Leonard
3800 Barrett Drive Stormwater Plan as Requested with Recent
Address: Raleigh, NC 27609 Desc: 401 Certification
Phone: Date: 8/16/12
North Building Expansion for Cloverleaf Cold
Re: Storage Facility in Benson, NC CC:
❑ Urgent 0 For Your Use ❑ Please Return ❑ Please Reply ❑ Please Recycle
• Comments:
Ms. Witherspoon,
In accordance with Condition #5 in the recent 401 Certification that was obtained for Cloverleaf Cold Storage, we
are hereby submitting to you two (2) full -size copies of our Stormwater Management Plan with detail sheets;
along with two (2) copies of our approval letter from Johnston County.
Please call if you have any questions. /;�k 17 f��y n
jjJJlf�U,
AUG 2 9 2012
- - -- Brian Leonard
t` •

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DEPARTMENT OF PUBLIC UTILITIES
POST OFFICE BOX 2263
SMITHFIELD, N.C. 27577
(919) 989 -5075
July 25, 2012
CCS Realty
Attn: William Roark Feiges
2800 Cloverleaf Court
Sioux City, ]A 51 l l 1
Re. North Building Expansion at Cloverleaf Cold Storage
444 Gilbert Road, Benson, NC
Stormwater Management Plan
Dear Mr. Feigis:
IQe1,r ;real r"O.
7%2411
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,,,,. ,
We have reviewed the Stormwater Management Plan submitted for [lie proposed North Building
Expansion at the Cloverleaf Cold Storage facility located at 444 Gilbert Road in Benson, North
Carolina. Based upon the information submitted, the Stormwater Management Plan has been
approved with the following stipulations:
1. This approval includes the "Future Phase of Gravcl Drive" as labeled on the revised site
plan sheet C -1.
2. 'ihe outlets for all existing and proposed gutter drains that discharge directly into the
pond shall be provided with a measure to achieve non - erosive flow.
3. Prior to issuance of the Certificate of Occupancy, a fee for 25% of the construction cost
of the improvements to the wet pond shall be paid to Johnston County Public Utilities.
An engineering estimate or documentation of actual construction costs for the pond must
be provided with the payment. Since the pond is an existing feature, the fee shall be
based only on the costs of improvements to the pond and outfall structure.
4. Please provide a notarized and recorded Inspection and Maintenance Agreement for the
wet pond. The Inspection and Maintenance Agreement must be recorded in the Johnston
County Register of Deeds Office for each BMP constructed. Inspection records shall he
provided to the Johnston County Public Utilities Department on a yearly basis.
5. Prior to the issuance of a Certificate of Occupancy, please provide a stormwater
certification stating that all stormwater facilities were constructed in accordance with the
approved stormwater management plan.
A copy of this letter will be forwarded to the Town of Benson Planning Office for their files. If
you have any questions or need additional information, please contact me at (919) 209 -8333 or by
email at Jamic .Gucrrero(ri;'ohnstorfnc.ctnn.
Sincerely,
41a�
Guerrero, PE, CPSWQ
Stormwater Administrator
cc: Braston Newton —Town of Benson Planning Director via entail
Brian Leonard, PE, PLS — BRL Engineering via email
Pnnlea ov recycled paper 4a

INFORMATION FOR STORMWATER MANAGEMENT
Due to Existing_ Impervious Are as on-site, different computational methods may be utilized in order to sm.tnict or "take
our existing impervious areas that were installed prior to current regulations, or otherwise considered " exempt".
Below, is a method used by the Project Engineer considered appropriate for computing New /Additional Impervious
Area percentage that is applicable to current stormwater regulations.
NET SITE AREA APPLICABLE FOR STORMWATEIt:
Total Usabie/Buiidable Site Area =18.96 AC (Outside of NCDOT RNV - See Site info Sheet G1)
Existing impervious "Exempt' - 954 AC (Installed prior to stomrrtlater regulations)
Net Site Area Applicable for Storrnwater _ 9.42 AC (Remaining "Pervious" In Existing COndttioro)
NEW /ADDITIONAL IMPERVIOUS AREA APPLICABLE FOR STORMWATER:
Existing impervious "Not Exempt" = 0.51 AC (installed after stormwater regulations)
Proposed New /Additional Impervious =1.81 AC (Proposed Added This Plan)
Proposed impervious Removed 4-10.62 AC (Proposed Removed This Plan)
Total impervious for Stormwater =1.70 AC (Percent = 1.7019.42 =18.0% Site Impervious)
ATTENUATION: The New /Additional Impervious Area Percentage is 18.0° %, computed above; which is greater than
the 15°% allowable by County & Town criteria; and therefore ATTENUATION IS REQUIRED. When attenuation is
required, County & Town regulations stipulate that a detention pond be installed on -site and designed to attenuate the
1 -year storm event, at a minimum. For this site, there already exists a wet retention pond. This pond has a large
storage volume and likely already attenuates the 1 -year event. The pond outlet structure already requires modification
for water quality requirements (see TSS below); and an analysis of the 1 -year event (after the proposed building
expansion and outlet modifications) reveals that the finallmodified pond outlet will even further attenuate the 1 -year
storm (above and beyond its current attenuation). Therefore, the attenuation goal for a 1 -year event wD easily be
achieved.
TSS (TOTAL SUSPENDED SOLIDS): The Town of Benson has recently become an EPA Phase 11 Starrnwstar
community and now requires that a minimum of 85% TSS removal be provided on sites that are not exempt from its
stormwater regulations. This site is not exempt from the regulations and must meet the Town's stormwater
requirements. Essentially for this site, the current wet retention pond must be shown to meet the TSS requirements.
The existing pond has a large amount of storage area and volume, making it conducive to meeting the requirements.
Further analysis of the pond and its existing riser outlet revealed that with some minor modifications to the outlet, the
TSS removal goal can be achieved. Additionally, the construction of a new forebay and minor excavation of the
existing pond bottom will also allow the new pond to be in compliance with current design criteria for watt ponds.
Therefore, these modifications to the pond can achieve the goal for TSS removal and meet current desgn criteria.
NITROGEN LOADING: The Town of Benson does not have nitrogen goal requirements, nor stipulate any nitrogen
removal, in its current stormwater regulations.
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NWAU. NtW 4- rvk; HF't IHRU
DESIGN /ATTENUATION RISER NTRA TOR's A FITTING STORM DRAINAGE STRUCTURE SUMMARY_ 1 ti
E� PER CONTRACiOR's APPROVED
SHOP WATER QUALITY VOLUME (CORE -DRILL INTO EXIST RISER
STORAGE ELEV W/WATERTIGHT CONNECTION) EXIST. TOP OF RISD4 ELEV
TOP OF FOREBAY ELEV. (W 7H GRATE m WRS)
(BELOW NORMAL POOL) /-- OUST. TOP OF DAM ELEV.
%
1V0/ltL POOL EXIST. DAM / \ /��
EXIST. COACRE 1E `� \\
S)RUCTTRE �xl USE NORTH GREEN
REINFORCEMENT
S OR
\ K \ \ EQUAL WITH FINAL SEEDING Q
INSTALL NEW 6" DUCTILE IRON OR ALUMINUM PIPE 1 D = �1.0'(MIN)� CONSTRUCT NEW FOREBAY DAM. THRU RISER FITTED MATH VALVE POND DRAIN, PER
SEE 0ON701JRS IN PLAN VIEW FOR LOCATION CONTRACTOR's APPROVED SHOP DRAWING
(CORE -DRILL INTO BOTTOM OF EXIST RISER
W/WATERTIGHT & RESTRAINED CONNECTION)
EXCAVATE TO NEW BOTTOM ELEV (EXTEND MANUAL VALVE CONTROL ABOVE RISER) C
FOR REVD SEDIMENT STORAGE 2' (MIN) 1. BECAUSE FIELD ADJUSTMENTS ARE SOMETIMES NECESSARY. "TOP ELEVS" GIVEN IN THIS CHART ARE RECOMMENDATIONS ONLY. THE TOP OF STRUCTURE SHALL BE VERIFIED BY THE PROJECT
SURVEYOR PRIOR TO STAKING OUT ACCORDING TO THE PROPOSED GRADES AND ANY MINOR FIELD ADJUSTMENTS MADE AS NECESSARY. Z
2. DO NOT MATCH CROWNS FOR DIFFERENT PIPE SIZES AT INLETS; PIPES ARE SET ON MINIMUM GRADES AND ARE NOT CONDUCIVE FOR MATCHING CROWNS. w
EXIST POND MOD19CATIONS - N DETAIL SECTION VFW
NO SCALE
POND DATA CHART N.� MANHOLE COVER 1W-
WET POND INFO DIMENSION ELEVATION 1. Modifications to existing pond shall take place AFTER upstream construction areas are FRAME & GRATE FOR FRAME & GRATE FOR DROP INLET REF: NCDOT STD. 840.54 Q
stabilized and the temporary sediment basin within the pond is cleaned of sediment and ready DROP INLET REF: NCDOT STD. 840.24 (IN GRASS OR
TOP OF DAM (EXIST) 15' -20' EXIST WIDTH 202.5 +/- to be removed (ref. Erosion Control Plan "Construction Sequence'). Use temporary seeding REF: NCDOT STD. 840.16 DITCH OR STD. 840.29 IN PAVEMENT)
SPILLWAY (EXIST) NONE N/A as required during grading operations. No final seeding is necessary on the ) ( n BRICK ADJUSTMENT
9 9 9 pe g • ry pond as the ��� ®ITCH /SWALE DETAIL AS REQ'D N Q O
TOP OF CONC. BOX RISER (EXIST) 41 X 3'W 200.85 existing pond dam and slopes are not to be disturbed. t ,, • 6"
CORED ORIFICE(S) (K► E=T rtrs> X (NOT FOR NUTR IENT REMOVAL CREDIT) 4" I REINF. CONC. SLAB a m m o
NEW 4" PVC PIPE & FITTING W /ORIFICE 4 ORIFICE DIA. 199.00 2. Repair any existing leaks or damaged areas on existing concrete riser structure to ensure a NO SCALE " 1/4'-,/ m N
*NEW
(SET FOR 6" DI rA PIPE )& FITTING W/VALVE 6" PIPE & VALVE DIA. 196.0 +/- final, watertight structure. REF. NCDOT STD "H" STD. CONCRETE APRON SM "H• MOR R r
(SET AT 00rMM OF Fart POND DRArN) STD 840.14/.15 REF: NCDOT REFS NCDOT NEW TOP OF FOREBAY DAM 5 WIDTH (MIN) 198.00 STD 840.19/.28 STD 840.31/.32
POND BOTTOM (EXIST) - - -- 196.0 +/- NOTES (TYPE »D ") } Z
POND BOTTOM (ww Fort wim sFDlimt s1oRAD0 - - -- 195.0 FW- }- m
OUTLET PIPE, INLET INVERT (EXIST) (IN RISER) 24" RCP 193.67 1. During site glrading, temporary diversion ditches and/or temporary seeding can be used OD D D Q m a f-.
OUTLET PIPE, OUTLET INVERT (EXIST) 24" RCP 193.55 in lieu of thee,, final ditch section to drain as necessary (ref Erosion Control Plan). Final
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seeding on ;grass swales shall be in accordance with the Final/Permanent Seeding y V
Specifications (ref. Sheet C-5). Use reinforcement matting with final seeding in O Q Q W O
accordance with this detail and /or the Erosion Control Plan. OPTIONAL. MORE SHALLOW Of 0 CK U a
STD. DROP INLET
STD. DEPTH: FOR D = 15 ": STD. H = 2'6" OR 2.5'
2. Construct ditch slopes as indicated by contours in plan view. STD. DEPTH: FOR D = 15 ": STD. H = 2'3" OR 2.25' STD. DEPTH: FOR D = 15 ": STD. H = 1'11" OR 1.92' FOR D = 18 ": STD. H = 2'9' OR 2.75'
FOR D = 18 ": STD. H - 2'6" OR 2.5' FOR D - 1W: STD. H - 2'2" OR 2.17' FOR D = 24 ": STD. H = 3'3" OR 3.25' ca ^•cal
FOR D = 2e: STD. H = 3'0* OR 3.0' FOR D = 24 ": STD. H = 2'8+ OR 2.67' FOR D = 30M: STD. H = 3'9" OR 3.75' v
CONSTRUCTION NOTES /SPECIFICATI-ONS �• GENERAL POND GRADING FOR D - 30 ": STD. H = 3'6 OR 3.5 FOR D - 30": STD. H = 3'2 OR 3.17 FOR D = 36": STD. H = 43" OR 4.25
FOR D = 36 ": STD. H = 0' OR 4.0' FOR D = 36 ": STD. H - 3'8" OR 3.67' d
1. The only fill material required for this existing pond modification is construction of an internal dam for a new forebay. The forebay dam will NOTES NO 'BLIND JUNCTIONS" ALLOWED (WITHOUT MANHOLE ACCESS) 0 4 o 40
be constructed with a top elevation just below the normal pool ele ction and shall be constructed with suitable day material STD. MANHOLE MAY BE USED IN LIEU OF JUNCTION BOX AS d 43 C4 N M
CONTRACTOR shall be responsible for all earth material moved and used for the pond. CONTRACTOR shall ensure that all material for ALLOWED BY ENGINEER. 4)
the pond (whether from on-site or hauled -in) is suitable for the intended use. CONTRACTOR shall provide for any proof - rolling and provide ' `' d CV v* eV
for independent compaction testing at various lifts and stages of pond Construction. CONTRACTOR shall provide to ENGINEER a certified STANDAFD AK=T DROP #W.EM �STAADAAD AKDOT ✓UAMC774IV BOX � co to
copy of compaction test results from the independent testing firm. NO SCALE •Cc
NO SCALE
• The independent testing firm should provide specifications for Soil types, plasticity index, etc. for soil materials used for the forebay dam ca � s c
construction. In the absence of any specifications from an independent testing firm, soil shall be a day soil with a plasticity index of 20 .0 cc O
(minimum). CONTRACTOR shall have the independent testing firm verify the specified conditions for soils used in the field and provide a O LU s-
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certifies copy of the results t0 ENGINEER. STORM DRAINAGE STANDARD STRUCTURE DEPTHS co 4 L+" O cm
• Pond Excavations MAY BE CLASSIFIED for rock, poor soils, or other unworkable characteristics according to the private contract NO SCALE
between OWNER and CONTRACTOR. ENGINEER has NOT classified any soils on this site nor specified separate or additional payment
for certain soils types or conditions NOT ALL STRUCTURES ARE DESIGNED NOR BUILT AT STANDARD DEPTH. THE TERM AThAk
"STANDARD DEPTH" IS A DEPTH FOR PROVIDING TYPICAL PIPE COVER FOR MOST
2. CONTRACTOR shall estimate all earthwork quantities based on the existing and proposed contours and /or pond section details and shall CIRCUMSTANCES. SEE PLANS OR STORM DRAINAGE STRUCTURE SUMMARY FOR RECOMMENDED
bid any lump sum work or provide overall pricing according to his own take -offs. See Grading Plan for overall grading scheme. DESIGN ELEVATIONS FOR TOP OF STRUCTURE AND INVERTS. FINAL FIELD ELEVATIONS MAY BE
ADJUSTED SLIGHTLY AS NEEDED TO MATCH FIELD CONDITIONS. a
3. CONTRACTOR is responsible for locating underground utilities and other facilities prior to construction, and the protection of utilities during •+ IN SPECIAL CIRCUMSTANCES. DUE TO FLAT TOPOGRAPHY OR OTHER EXISTING CONDITIONS.
construction. To the ENGINEER's knowledge, a detailed sub- surface investigation and/or geotechnical analysis has not been perfom>ed to SOME STRUCTURES MAY BE DESIGNED OR BUILT AT SLIGHTLY LESS THAN STANDARD DEPTHS.
confirm the existence or non - existence of rock, poor soils, underground utilities, hazardous materials, or other possible sub - surface
conditions.
4. Provide all temporary and/or permanent reinforcement matting forestablishment of final grass cover as indicated on the Stormwater Plan
and/or the Erosion Control Plan. All denuded areas left exposed (rthat are above the permanent, normal pawl elevation) shall be stabilized in Ott► IN/
accordance with the seeding schedule for erosion Control; or otherwise according to an approved seasonni mix; with a final straw mulct and `������ � ���i,�* •`
tack coat, Final recommended grass seeding shall be as indicates on the Plans or Details or otherwise as coordinated between OWNER _ ��`���,,. • • • II/���
and CONTRACTOR (and in accordance with the final seeding seteduls as specified).
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5. Any waste material remaining after finished grades have been established may be distributed in appropriate areas within the limits of y � • �?
disturbance. Excess material not utilized on -site shall be disposed) of by CONTRACTOR. Notify the appropriate permitting authority upon
PIPE OUT
PIPE1 -IN
PIPE2-IN
PIPE3-IN
PIPE LENGTH & SLOPE
SIZE/INV. ELEV
SIZE ANV. ELEV
SIZE ANV. ELEV
SIZE/INV. ELEV
STIR.
STREET
1
BETWEEN STRUCTURES Z
No.
STATION
DESCRIPTION
TOP ELEV
& STR. DEPTH
(UPSTREAM STR.)
(UPSTREAM STR.)
(UPSTREAM STR.)
ADDITIONAL INFO
( ro cainR OF smuG7t
SD -1
N/A
NCIwT DROP INLET
204.5 +/- IN DITCH
18" /202.00
00
N/A
N/A
N/A
NCDOT STD 840.14, .15. OR ALT. NCOOT STD.
N/A
025
840.45. •46-W /GRATE STD. 840.16; OR NCDOT
STD. 840.19 SAG GRATE STD. 840.24
Z
.28-W
l ° 102.0 LF s 0.4902%
SD -2
N/A
NCDOT DROP INLET
204.5 +/- IN DITCH
24" / 201.50
18" /201.5
N/A
N/A
NCDOT SID 840.14, .15. OR ALL NCDOT SM.
D'
(�-1)
840,45, ,46 -W /GRATE SID. 840.16; OR NCDOT
STD. 840.19 8-W SAG GRATE STD. 840.24
L - 126.0 LF a 0.4762%
SD -3
N/A
NCDOT DROP INLET
205.75 +/-
30" /200.90
»
24 / 200.9
N/A
N/A
NCDOT STD 840.14• .15, OR ALT. NCDOT STD.
FLUSH W /ASHALT
D�eBS•
(SD -2)
.840,45,
.46 -W /GRATE STD. 840.16; OR NCDOT
STD. 840.19 /FLAT GRATE STD. 840.29
SO -4
N/A
NCDOT DROP INLET
205.75+/-
36" /200.44
30 / 200.44
N/A
N/A
.28-W
NCDOT SID 840.14..15, OR ALT. NCDOT STD.
L - 102.0 LF s ■■ q.451OX
(REPLACES EXISTING INLET)
FLUSH W /ASPHALT
D-.L' JI•
(SD-3)
840.45, .46- W //GRATE STD. 840.16; OR NCDOT
STD. 840.19 /FLAT GRATE STD. 840.29
SO -5
N/A
NCDOT JUNCTION BOX
206.0+/-
36" /200.20
36" /200.20
N/A
N/A
.28-W
NCDOT STD 840.31, .32 -W/MH UD STD. 840.54;
L - 520 LF s = 0.4615X
W/MANHOLE UD
Z
D-dB'
(SO-4)
MANHOLE SID. 84A5r, .52 ALLOWED AS ALT.
UPON APPROVAL BY ENGINEER
SD -6
N/A
NCDOT JUNCTION BOX
207.0 +/:
36" / 198.40
36" / 198.4
N/A
N/A
NCDOT STD 840.31..32 -W/MH UD STD. 840.54;
L ■■ 352.0 LF s 0.5114X
W/MANHOLE UD
(SD -5)
MANHOLE SID. 840.51, .52 ALLOWED AS ALT.
UPON APPROVAL BY ENGINEER
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L - 60.0 LF a 0.6667X
OUTLET
N/A
FLARED END SECTION
N/A
36" / 19&0
N/A
N/A
N/A
PIPE LENGTH INCLUDES FLARED END SECTION
PIPE OUTLET AT STORMWATER PON
O
EXCAVATE TO NEW BOTTOM ELEV (EXTEND MANUAL VALVE CONTROL ABOVE RISER) C
FOR REVD SEDIMENT STORAGE 2' (MIN) 1. BECAUSE FIELD ADJUSTMENTS ARE SOMETIMES NECESSARY. "TOP ELEVS" GIVEN IN THIS CHART ARE RECOMMENDATIONS ONLY. THE TOP OF STRUCTURE SHALL BE VERIFIED BY THE PROJECT
SURVEYOR PRIOR TO STAKING OUT ACCORDING TO THE PROPOSED GRADES AND ANY MINOR FIELD ADJUSTMENTS MADE AS NECESSARY. Z
2. DO NOT MATCH CROWNS FOR DIFFERENT PIPE SIZES AT INLETS; PIPES ARE SET ON MINIMUM GRADES AND ARE NOT CONDUCIVE FOR MATCHING CROWNS. w
EXIST POND MOD19CATIONS - N DETAIL SECTION VFW
NO SCALE
POND DATA CHART N.� MANHOLE COVER 1W-
WET POND INFO DIMENSION ELEVATION 1. Modifications to existing pond shall take place AFTER upstream construction areas are FRAME & GRATE FOR FRAME & GRATE FOR DROP INLET REF: NCDOT STD. 840.54 Q
stabilized and the temporary sediment basin within the pond is cleaned of sediment and ready DROP INLET REF: NCDOT STD. 840.24 (IN GRASS OR
TOP OF DAM (EXIST) 15' -20' EXIST WIDTH 202.5 +/- to be removed (ref. Erosion Control Plan "Construction Sequence'). Use temporary seeding REF: NCDOT STD. 840.16 DITCH OR STD. 840.29 IN PAVEMENT)
SPILLWAY (EXIST) NONE N/A as required during grading operations. No final seeding is necessary on the ) ( n BRICK ADJUSTMENT
9 9 9 pe g • ry pond as the ��� ®ITCH /SWALE DETAIL AS REQ'D N Q O
TOP OF CONC. BOX RISER (EXIST) 41 X 3'W 200.85 existing pond dam and slopes are not to be disturbed. t ,, • 6"
CORED ORIFICE(S) (K► E=T rtrs> X (NOT FOR NUTR IENT REMOVAL CREDIT) 4" I REINF. CONC. SLAB a m m o
NEW 4" PVC PIPE & FITTING W /ORIFICE 4 ORIFICE DIA. 199.00 2. Repair any existing leaks or damaged areas on existing concrete riser structure to ensure a NO SCALE " 1/4'-,/ m N
*NEW
(SET FOR 6" DI rA PIPE )& FITTING W/VALVE 6" PIPE & VALVE DIA. 196.0 +/- final, watertight structure. REF. NCDOT STD "H" STD. CONCRETE APRON SM "H• MOR R r
(SET AT 00rMM OF Fart POND DRArN) STD 840.14/.15 REF: NCDOT REFS NCDOT NEW TOP OF FOREBAY DAM 5 WIDTH (MIN) 198.00 STD 840.19/.28 STD 840.31/.32
POND BOTTOM (EXIST) - - -- 196.0 +/- NOTES (TYPE »D ") } Z
POND BOTTOM (ww Fort wim sFDlimt s1oRAD0 - - -- 195.0 FW- }- m
OUTLET PIPE, INLET INVERT (EXIST) (IN RISER) 24" RCP 193.67 1. During site glrading, temporary diversion ditches and/or temporary seeding can be used OD D D Q m a f-.
OUTLET PIPE, OUTLET INVERT (EXIST) 24" RCP 193.55 in lieu of thee,, final ditch section to drain as necessary (ref Erosion Control Plan). Final
D Lil Z Y 1t!
seeding on ;grass swales shall be in accordance with the Final/Permanent Seeding y V
Specifications (ref. Sheet C-5). Use reinforcement matting with final seeding in O Q Q W O
accordance with this detail and /or the Erosion Control Plan. OPTIONAL. MORE SHALLOW Of 0 CK U a
STD. DROP INLET
STD. DEPTH: FOR D = 15 ": STD. H = 2'6" OR 2.5'
2. Construct ditch slopes as indicated by contours in plan view. STD. DEPTH: FOR D = 15 ": STD. H = 2'3" OR 2.25' STD. DEPTH: FOR D = 15 ": STD. H = 1'11" OR 1.92' FOR D = 18 ": STD. H = 2'9' OR 2.75'
FOR D = 18 ": STD. H - 2'6" OR 2.5' FOR D - 1W: STD. H - 2'2" OR 2.17' FOR D = 24 ": STD. H = 3'3" OR 3.25' ca ^•cal
FOR D = 2e: STD. H = 3'0* OR 3.0' FOR D = 24 ": STD. H = 2'8+ OR 2.67' FOR D = 30M: STD. H = 3'9" OR 3.75' v
CONSTRUCTION NOTES /SPECIFICATI-ONS �• GENERAL POND GRADING FOR D - 30 ": STD. H = 3'6 OR 3.5 FOR D - 30": STD. H = 3'2 OR 3.17 FOR D = 36": STD. H = 43" OR 4.25
FOR D = 36 ": STD. H = 0' OR 4.0' FOR D = 36 ": STD. H - 3'8" OR 3.67' d
1. The only fill material required for this existing pond modification is construction of an internal dam for a new forebay. The forebay dam will NOTES NO 'BLIND JUNCTIONS" ALLOWED (WITHOUT MANHOLE ACCESS) 0 4 o 40
be constructed with a top elevation just below the normal pool ele ction and shall be constructed with suitable day material STD. MANHOLE MAY BE USED IN LIEU OF JUNCTION BOX AS d 43 C4 N M
CONTRACTOR shall be responsible for all earth material moved and used for the pond. CONTRACTOR shall ensure that all material for ALLOWED BY ENGINEER. 4)
the pond (whether from on-site or hauled -in) is suitable for the intended use. CONTRACTOR shall provide for any proof - rolling and provide ' `' d CV v* eV
for independent compaction testing at various lifts and stages of pond Construction. CONTRACTOR shall provide to ENGINEER a certified STANDAFD AK=T DROP #W.EM �STAADAAD AKDOT ✓UAMC774IV BOX � co to
copy of compaction test results from the independent testing firm. NO SCALE •Cc
NO SCALE
• The independent testing firm should provide specifications for Soil types, plasticity index, etc. for soil materials used for the forebay dam ca � s c
construction. In the absence of any specifications from an independent testing firm, soil shall be a day soil with a plasticity index of 20 .0 cc O
(minimum). CONTRACTOR shall have the independent testing firm verify the specified conditions for soils used in the field and provide a O LU s-
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certifies copy of the results t0 ENGINEER. STORM DRAINAGE STANDARD STRUCTURE DEPTHS co 4 L+" O cm
• Pond Excavations MAY BE CLASSIFIED for rock, poor soils, or other unworkable characteristics according to the private contract NO SCALE
between OWNER and CONTRACTOR. ENGINEER has NOT classified any soils on this site nor specified separate or additional payment
for certain soils types or conditions NOT ALL STRUCTURES ARE DESIGNED NOR BUILT AT STANDARD DEPTH. THE TERM AThAk
"STANDARD DEPTH" IS A DEPTH FOR PROVIDING TYPICAL PIPE COVER FOR MOST
2. CONTRACTOR shall estimate all earthwork quantities based on the existing and proposed contours and /or pond section details and shall CIRCUMSTANCES. SEE PLANS OR STORM DRAINAGE STRUCTURE SUMMARY FOR RECOMMENDED
bid any lump sum work or provide overall pricing according to his own take -offs. See Grading Plan for overall grading scheme. DESIGN ELEVATIONS FOR TOP OF STRUCTURE AND INVERTS. FINAL FIELD ELEVATIONS MAY BE
ADJUSTED SLIGHTLY AS NEEDED TO MATCH FIELD CONDITIONS. a
3. CONTRACTOR is responsible for locating underground utilities and other facilities prior to construction, and the protection of utilities during •+ IN SPECIAL CIRCUMSTANCES. DUE TO FLAT TOPOGRAPHY OR OTHER EXISTING CONDITIONS.
construction. To the ENGINEER's knowledge, a detailed sub- surface investigation and/or geotechnical analysis has not been perfom>ed to SOME STRUCTURES MAY BE DESIGNED OR BUILT AT SLIGHTLY LESS THAN STANDARD DEPTHS.
confirm the existence or non - existence of rock, poor soils, underground utilities, hazardous materials, or other possible sub - surface
conditions.
4. Provide all temporary and/or permanent reinforcement matting forestablishment of final grass cover as indicated on the Stormwater Plan
and/or the Erosion Control Plan. All denuded areas left exposed (rthat are above the permanent, normal pawl elevation) shall be stabilized in Ott► IN/
accordance with the seeding schedule for erosion Control; or otherwise according to an approved seasonni mix; with a final straw mulct and `������ � ���i,�* •`
tack coat, Final recommended grass seeding shall be as indicates on the Plans or Details or otherwise as coordinated between OWNER _ ��`���,,. • • • II/���
and CONTRACTOR (and in accordance with the final seeding seteduls as specified).
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5. Any waste material remaining after finished grades have been established may be distributed in appropriate areas within the limits of y � • �?
disturbance. Excess material not utilized on -site shall be disposed) of by CONTRACTOR. Notify the appropriate permitting authority upon
8
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O
W
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O
5
W
EXCAVATE TO NEW BOTTOM ELEV (EXTEND MANUAL VALVE CONTROL ABOVE RISER) C
FOR REVD SEDIMENT STORAGE 2' (MIN) 1. BECAUSE FIELD ADJUSTMENTS ARE SOMETIMES NECESSARY. "TOP ELEVS" GIVEN IN THIS CHART ARE RECOMMENDATIONS ONLY. THE TOP OF STRUCTURE SHALL BE VERIFIED BY THE PROJECT
SURVEYOR PRIOR TO STAKING OUT ACCORDING TO THE PROPOSED GRADES AND ANY MINOR FIELD ADJUSTMENTS MADE AS NECESSARY. Z
2. DO NOT MATCH CROWNS FOR DIFFERENT PIPE SIZES AT INLETS; PIPES ARE SET ON MINIMUM GRADES AND ARE NOT CONDUCIVE FOR MATCHING CROWNS. w
EXIST POND MOD19CATIONS - N DETAIL SECTION VFW
NO SCALE
POND DATA CHART N.� MANHOLE COVER 1W-
WET POND INFO DIMENSION ELEVATION 1. Modifications to existing pond shall take place AFTER upstream construction areas are FRAME & GRATE FOR FRAME & GRATE FOR DROP INLET REF: NCDOT STD. 840.54 Q
stabilized and the temporary sediment basin within the pond is cleaned of sediment and ready DROP INLET REF: NCDOT STD. 840.24 (IN GRASS OR
TOP OF DAM (EXIST) 15' -20' EXIST WIDTH 202.5 +/- to be removed (ref. Erosion Control Plan "Construction Sequence'). Use temporary seeding REF: NCDOT STD. 840.16 DITCH OR STD. 840.29 IN PAVEMENT)
SPILLWAY (EXIST) NONE N/A as required during grading operations. No final seeding is necessary on the ) ( n BRICK ADJUSTMENT
9 9 9 pe g • ry pond as the ��� ®ITCH /SWALE DETAIL AS REQ'D N Q O
TOP OF CONC. BOX RISER (EXIST) 41 X 3'W 200.85 existing pond dam and slopes are not to be disturbed. t ,, • 6"
CORED ORIFICE(S) (K► E=T rtrs> X (NOT FOR NUTR IENT REMOVAL CREDIT) 4" I REINF. CONC. SLAB a m m o
NEW 4" PVC PIPE & FITTING W /ORIFICE 4 ORIFICE DIA. 199.00 2. Repair any existing leaks or damaged areas on existing concrete riser structure to ensure a NO SCALE " 1/4'-,/ m N
*NEW
(SET FOR 6" DI rA PIPE )& FITTING W/VALVE 6" PIPE & VALVE DIA. 196.0 +/- final, watertight structure. REF. NCDOT STD "H" STD. CONCRETE APRON SM "H• MOR R r
(SET AT 00rMM OF Fart POND DRArN) STD 840.14/.15 REF: NCDOT REFS NCDOT NEW TOP OF FOREBAY DAM 5 WIDTH (MIN) 198.00 STD 840.19/.28 STD 840.31/.32
POND BOTTOM (EXIST) - - -- 196.0 +/- NOTES (TYPE »D ") } Z
POND BOTTOM (ww Fort wim sFDlimt s1oRAD0 - - -- 195.0 FW- }- m
OUTLET PIPE, INLET INVERT (EXIST) (IN RISER) 24" RCP 193.67 1. During site glrading, temporary diversion ditches and/or temporary seeding can be used OD D D Q m a f-.
OUTLET PIPE, OUTLET INVERT (EXIST) 24" RCP 193.55 in lieu of thee,, final ditch section to drain as necessary (ref Erosion Control Plan). Final
D Lil Z Y 1t!
seeding on ;grass swales shall be in accordance with the Final/Permanent Seeding y V
Specifications (ref. Sheet C-5). Use reinforcement matting with final seeding in O Q Q W O
accordance with this detail and /or the Erosion Control Plan. OPTIONAL. MORE SHALLOW Of 0 CK U a
STD. DROP INLET
STD. DEPTH: FOR D = 15 ": STD. H = 2'6" OR 2.5'
2. Construct ditch slopes as indicated by contours in plan view. STD. DEPTH: FOR D = 15 ": STD. H = 2'3" OR 2.25' STD. DEPTH: FOR D = 15 ": STD. H = 1'11" OR 1.92' FOR D = 18 ": STD. H = 2'9' OR 2.75'
FOR D = 18 ": STD. H - 2'6" OR 2.5' FOR D - 1W: STD. H - 2'2" OR 2.17' FOR D = 24 ": STD. H = 3'3" OR 3.25' ca ^•cal
FOR D = 2e: STD. H = 3'0* OR 3.0' FOR D = 24 ": STD. H = 2'8+ OR 2.67' FOR D = 30M: STD. H = 3'9" OR 3.75' v
CONSTRUCTION NOTES /SPECIFICATI-ONS �• GENERAL POND GRADING FOR D - 30 ": STD. H = 3'6 OR 3.5 FOR D - 30": STD. H = 3'2 OR 3.17 FOR D = 36": STD. H = 43" OR 4.25
FOR D = 36 ": STD. H = 0' OR 4.0' FOR D = 36 ": STD. H - 3'8" OR 3.67' d
1. The only fill material required for this existing pond modification is construction of an internal dam for a new forebay. The forebay dam will NOTES NO 'BLIND JUNCTIONS" ALLOWED (WITHOUT MANHOLE ACCESS) 0 4 o 40
be constructed with a top elevation just below the normal pool ele ction and shall be constructed with suitable day material STD. MANHOLE MAY BE USED IN LIEU OF JUNCTION BOX AS d 43 C4 N M
CONTRACTOR shall be responsible for all earth material moved and used for the pond. CONTRACTOR shall ensure that all material for ALLOWED BY ENGINEER. 4)
the pond (whether from on-site or hauled -in) is suitable for the intended use. CONTRACTOR shall provide for any proof - rolling and provide ' `' d CV v* eV
for independent compaction testing at various lifts and stages of pond Construction. CONTRACTOR shall provide to ENGINEER a certified STANDAFD AK=T DROP #W.EM �STAADAAD AKDOT ✓UAMC774IV BOX � co to
copy of compaction test results from the independent testing firm. NO SCALE •Cc
NO SCALE
• The independent testing firm should provide specifications for Soil types, plasticity index, etc. for soil materials used for the forebay dam ca � s c
construction. In the absence of any specifications from an independent testing firm, soil shall be a day soil with a plasticity index of 20 .0 cc O
(minimum). CONTRACTOR shall have the independent testing firm verify the specified conditions for soils used in the field and provide a O LU s-
w
certifies copy of the results t0 ENGINEER. STORM DRAINAGE STANDARD STRUCTURE DEPTHS co 4 L+" O cm
• Pond Excavations MAY BE CLASSIFIED for rock, poor soils, or other unworkable characteristics according to the private contract NO SCALE
between OWNER and CONTRACTOR. ENGINEER has NOT classified any soils on this site nor specified separate or additional payment
for certain soils types or conditions NOT ALL STRUCTURES ARE DESIGNED NOR BUILT AT STANDARD DEPTH. THE TERM AThAk
"STANDARD DEPTH" IS A DEPTH FOR PROVIDING TYPICAL PIPE COVER FOR MOST
2. CONTRACTOR shall estimate all earthwork quantities based on the existing and proposed contours and /or pond section details and shall CIRCUMSTANCES. SEE PLANS OR STORM DRAINAGE STRUCTURE SUMMARY FOR RECOMMENDED
bid any lump sum work or provide overall pricing according to his own take -offs. See Grading Plan for overall grading scheme. DESIGN ELEVATIONS FOR TOP OF STRUCTURE AND INVERTS. FINAL FIELD ELEVATIONS MAY BE
ADJUSTED SLIGHTLY AS NEEDED TO MATCH FIELD CONDITIONS. a
3. CONTRACTOR is responsible for locating underground utilities and other facilities prior to construction, and the protection of utilities during •+ IN SPECIAL CIRCUMSTANCES. DUE TO FLAT TOPOGRAPHY OR OTHER EXISTING CONDITIONS.
construction. To the ENGINEER's knowledge, a detailed sub- surface investigation and/or geotechnical analysis has not been perfom>ed to SOME STRUCTURES MAY BE DESIGNED OR BUILT AT SLIGHTLY LESS THAN STANDARD DEPTHS.
confirm the existence or non - existence of rock, poor soils, underground utilities, hazardous materials, or other possible sub - surface
conditions.
4. Provide all temporary and/or permanent reinforcement matting forestablishment of final grass cover as indicated on the Stormwater Plan
and/or the Erosion Control Plan. All denuded areas left exposed (rthat are above the permanent, normal pawl elevation) shall be stabilized in Ott► IN/
accordance with the seeding schedule for erosion Control; or otherwise according to an approved seasonni mix; with a final straw mulct and `������ � ���i,�* •`
tack coat, Final recommended grass seeding shall be as indicates on the Plans or Details or otherwise as coordinated between OWNER _ ��`���,,. • • • II/���
and CONTRACTOR (and in accordance with the final seeding seteduls as specified).
O : QGr i
kn - F-=
5. Any waste material remaining after finished grades have been established may be distributed in appropriate areas within the limits of y � • �?
disturbance. Excess material not utilized on -site shall be disposed) of by CONTRACTOR. Notify the appropriate permitting authority upon