20210778 Ver 2_Stormwater Approval_20230619

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
DOUGLAS R. ANSEL
Interim Director
June 6', 2023
Phillip and Jamie Lanzi, Property Owners
3210 Gralyn Terrace
Wilmington, NC 28411
NORTH CAROLINA
Environmental Quality
Subject: Post -Construction Stormwater Management Permit No. SW8 230502
6600 Carmel Trail
High Density Project
New Hanover County
Dear Mr. and Ms. Lanzi:
The Division of Energy, Mineral and Land Resources received a complete Post -Construction Stormwater
Management Permit Application for the subject project on May 311, 2023. Staff review of the plans and
specifications has determined that the project, as proposed, complies with the Stormwater Regulations set forth in
Title 15A NCAC 2H.1000 amended on January 1, 2017 (2017 Rules). We are hereby forwarding Permit No.
SW8 230502 dated June 6', 2023, for the construction, operation and maintenance of the built -upon areas (BUA)
and stormwater control measures (SCMs) associated with the subject project.
This permit shall be effective from the date of issuance until June 6th, 2031 and does not supersede any other
agency permit that may be required. The project shall be subject to the conditions and limitations as specified
therein. Failure to comply with these requirements will result in future compliance problems. Please note that
this permit is not transferable except after notice to and approval by the Division.
If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to request
an adjudicatory hearing by filing a written petition with the Office of Administrative Hearings (OAH). The
written petition must conform to Chapter 150B of the North Carolina General Statutes and must be filed with the
OAH within thirty (30) days of receipt of this permit. You should contact the OAH with all questions regarding
the filing fee (if a filing fee is required) and/or the details of the filing process at 6714 Mail Service Center,
Raleigh, NC 27699-6714, or via telephone at 919-431-3000, or visit their website at www.NCOAH.com. Unless
such demands are made this permit shall be final and binding.
If you have any questions concerning this permit, please contact Kellie Beth Norris in the Wilmington Regional
Office, at [phone] or [e-mail].
Sincerely,
CRC
Douglas R. Ansel, Interim Director
Division of Energy, Mineral and Land Resources
Enclosures: Attachment A — Designer's Certification Form
Application Documents
DES/kbn: \\\Stormwater\Permits & Projects\2023\230502 HD\2023 06 permit 230502
cc: Howard Resnik, PE; CSD Engineering
New Hanover County Engineering
Division of Coastal Management
Wilmington Regional Office Stormwater File
D_E Q� North Carolina Department of Environmental Quality I Division of Energy, Mineral and Land Resources
./ Wilmington Regional Office 1127 Cardinal Drive Extension I Wilmington, North Carolina 28405
910.796.7215

Post -Construction Stormwater Management
Permit No. SW8 230502
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF ENERGY, MINERAL AND LAND RESOURCES
POST -CONSTRUCTION STORMWATER MANAGEMENT PERMIT
HIGH DENSITY DEVELOPMENT
In compliance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as
amended, and other applicable Laws, Rules, and Regulations promulgated and adopted by the North
Carolina Environmental Management Commission, including 15A NCAC 02H.1000 amended on
January 1, 2017 (2017 Rules) (the "stormwater rules"),
PERMISSION IS HEREBY GRANTED TO
Phillip & Jamie Lanzi
6600 Caramel Trail
6600 Caramel Trail, Wilmington, New Hanover County
FOR THE
construction, management, operation and maintenance of built -upon area (BUA) draining to one (1)
Contech Stormfilter and one (1) area of permeable pavement ("stormwater control measures" or
"SCMs") discharging to Class SA-ORW waters as outlined in the application, approved stormwater
management plans, supplement, calculations, operation and maintenance agreement, recorded
documents, specifications, and other supporting data (the "approved plans and specifications') as
attached and/or on file with and approved by the Division of Energy, Mineral and Land Resources (the
"Division" or "DEMLR"). The project shall be constructed, operated and maintained in accordance
with these approved plans and specifications. The approved plans and specifications are
incorporated by reference and are enforceable part of this permit.
This permit shall be effective from the date of issuance until June 61", 2031 and shall be subject to the
following specified conditions and limitations. The permit issued shall continue in force and effect until
the permittee files a request with the Division for a permit modification, transfer, renewal, or
rescission; however, these actions do not stay any condition. The issuance of this permit does not
prohibit the Director from reopening and modifying the permit, revoking and reissuing the permit, or
terminating the permit for cause as allowed by the laws, rules, and regulations contained in Title 15A
NCAC 2H.1000 and NCGS 143-215.1 et.al.
BUA REQUIREMENTS. The maximum amount of BUA allowed for the entire project is 5,215
square feet. The runoff from all BUA within the permitted high density drainage areas of this
project must be directed into the permitted SCMs. The BUA requirements and allocations for
this project are as follows:
a. SCM BUA LIMITS. The SCMs labeled DA 1 (Contech Stormfilter) and DA 2 (Infiltrating
Permeable Pavement) have been designed to handle the runoff from 5,215 and 1,068
square feet of BUA, respectively, within the delineated drainage areas. This permit does not
provide any allocation of BUA for future development within the delineated drainage area(s)
for the SCMs labeled DA 1 and DA 2.
HIGH DENSITY SA-ORW WATER BUA LIMITS (DA 1 and DA 2). The overall percent of
BUA permitted for the portion of project within 575 feet of SA-ORW waters must not
exceed 25%. Within 575 feet of SA-ORW waters, this permit approves a percent BUA of
23% and the construction of a total of 5,215 square feet of BUA. This permit does not
provide any allocation of BUA for future development within 575 feet of SA-ORW waters.
Page 1 of 5

Post -Construction Stormwater Management
Permit No. SW8 230502
c. CAMA AECs. Where a project or lot is located within CAMA's Area of Environmental
Concern (AEC), the Division of Coastal Management (DCM) may calculate a different
maximum BUA based on CAMA regulations. The more restrictive BUA limit will apply to the
project.
2. PERVIOUS AREA IMPROVEMENTS. At this time, none of the pervious area improvements
listed in G.S. 143-214.7(b2) or the Stormwater Design Manual have been proposed for this
project. Pervious area improvements will be allowed in this project if documentation is provided
demonstrating those improvements meet the requirements of the stormwater rule.
SCM REQUIREMENTS. The SCM requirements for this project are as follows:
a. SCM DESIGN. The SCMs are permitted based on the design criteria presented in the
sealed, signed and dated supplement and as shown in the approved plans and
specifications. These SCMs must be provided and maintained at the design condition.
b. SCM DESIGN FOR SA WATER. The Contech Stormfilter (SCM) provides runoff treatment
for the difference between the pre- and post -development runoff volumes for the one-year,
24-hour storm event and have demonstrated that it is not feasible to meet the minimum
design criteria for an infiltration system. The stormwater is filtered through a minimum of 18
inches of sand prior to discharge. The discharge is directed to a level spreader — filter strip
and the excess runoff is released at a non -erosive velocity at the edge of the vegetated
setback or to an existing stormwater drainage system.
c. SCM DESIGN FOR SA WATER. The infiltrating permeable pavement (SCM) provides runoff
treatment without discharging in excess of the pre -development conditions during the one-
year, 24-hour storm event. The excess runoff is released at a non -erosive velocity at the
edge of the vegetated setback or to an existing stormwater drainage system.
PERMEABLE PAVEMENT. The following considerations pertain to the proposed infiltrating
permeable pavement:
i. Except for the incidental, unavoidable runoff from the stable vegetated areas shown
on the approved plans, runoff from adjacent pervious areas shall be prevented from
reaching the permeable pavement.
ii. It is recommended that during the installation of the permeable pavement, care is
taken to avoid compaction of the underlying subgrade soils. To confirm compaction
has not occurred, it is recommended that a direct measurement of the soil's
infiltration rate be conducted after excavation and before the aggregate is placed.
If the infiltration rate has diminished, it is recommended to scarify, rip, or trench the
subgrade to restore the infiltration rate.
iii. After installation, the permeable pavement shall be protected from sediment
deposition until the site is completed and stabilized.
iv. Concentrations of oils, grease, heavy metals, and toxic chemicals shall not be
stored or handled where they may enter the permeable pavement.
V. At no time shall the approved permeable pavement be paved over or repaired with
any type of conventional paving material.
4. STORMWATER OUTLETS. The peak flow from the 10-year storm event shall not cause
erosion downslope of the discharge point.
5. VEGETATED SETBACKS. A 50-foot wide vegetative setback must be provided and maintained
in grass or other vegetation adjacent to all surface waters as shown on the approved plans. The
setback is measured horizontally from the normal pool elevation of impounded structures, from
the top of bank of each side of streams or rivers, and from the mean high waterline of tidal
waters, perpendicular to the shoreline.
BUA IN THE VEGETATED SETBACK. BUA may not be added to the vegetated setback
except as shown on the approved plans.
b. RELEASE OF STORMWATER NOT TREATED IN AN SCM. Stormwater that is not treated
in an SCM must be released at the edge of the vegetated setback and allowed to flow
through the setback as dispersed flow.
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Post -Construction Stormwater Management
Permit No. SW8 230502
RECORDED DOCUMENT REQUIREMENTS. The stormwater rules require the following
documents to be recorded with the Office of the Register of Deeds:
a. EASEMENTS. All SCMs, stormwater collection systems, vegetated conveyances, and
maintenance access located on property owned by other persons or entities must be located
in permanent recorded easements or drainage easements as shown on the approved plans.
b. OPERATION AND MAINTENANCE AGREEMENT. The operation and maintenance
agreement must be recorded with the Office of the Register of Deeds.
c. FINAL PLATS. If a final plat is recorded, it must reference the operation and maintenance
agreement and must also show all public rights -of -way, dedicated common areas, and/or
permanent drainage easements, in accordance with the approved plans.
d. DEED RESTRICTIONS AND PROTECTIVE COVENANTS. The permittee shall record deed
restrictions and protective covenants prior to the issuance of a certificate of occupancy to
ensure the permit conditions and the approved plans and specifications are maintained in
perpetuity.
7. CONSTRUCTION. During construction, erosion shall be kept to a minimum and any eroded
areas of the on -site stormwater system will be repaired immediately.
a. UNDERGROUND SCMs. It is recommended that during the installation of the underground
SCM, photos be taken documenting the construction and demonstrating that the constructed
SCM meets the approved design. It is further recommended that these photos be submitted
with the required Designer's Certification.
b. PROJECT CONSTRUCTION, OPERATION AND MAINTENANCE. During construction, all
operation and maintenance for the project shall follow the Erosion Control Plan requirements
until the Sediment -Erosion Control devices are converted to SCMs or no longer needed.
Once the device is converted to a SCM, the permittee shall provide and perform the
operation and maintenance as outlined in the applicable section below.
c. SCM RESTORATION. If one or more of the SCMs are used as an Erosion Control device
and/or removed or destroyed during construction, it must be restored to the approved design
condition prior to close-out of the erosion control plan and/or project completion and/or
transfer of the permit. Upon restoration, a new or updated certification will be required for the
SCM(s) and a copy must be submitted to the appropriate DEQ regional office.
8. MODIFICATIONS. No person or entity, including the permittee, shall alter any component
shown in the approved plans and specifications. Prior to the construction of any modification to
the approved plans, the permittee shall submit to the Director, and shall have received approval
for modified plans, specifications, and calculations including, but not limited to, those listed
below. For changes to the project or SCM that impact the certifications, a new or updated
certification(s), as applicable, will be required and a copy must be submitted to the appropriate
DEQ regional office upon completion of the modification.
a. Any modification to the approved plans and specifications, regardless of size including the
SCM(s), BUA, details, etc.
b. Redesign or addition to the approved amount of BUA or to the drainage area.
c. Further development, subdivision, acquisition, lease or sale of any, all or part of the project
and/or property area as reported in the approved plans and specifications.
d. Altering, modifying, removing, relocating, redirecting, regrading, or resizing of any
component of the approved SCM(s), stormwater collection system and/or vegetative
conveyance shown on the approved plan.
e. The construction of any allocated future BUA.
f. The construction of any infiltrating permeable pavement, #57 stone area, public trails, or
landscaping material to be considered a pervious surface that were not included in the
approved plans and specifications.
g. Other modifications as determined by the Director.
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Post -Construction Stormwater Management
Permit No. SW8 230502
9. DESIGNER'S CERTIFICATION. Upon completion of the project, the permittee shall determine if
the project is in compliance with the approved plans and take the necessary following actions:
a. If the permittee determines that the project is in compliance with the approved plans, then
within 45 days of completion, the permittee shall submit to the Division one hard copy and
one electronic copy of the following:
i. The completed and signed Designer's Certification provided in Attachment A
noting any deviations from the approved plans and specifications. Deviations
may require approval from the Division,
ii. A copy of the recorded operation and maintenance agreement;
iii. Unless already provided, a copy of the recorded deed restrictions and
protective covenants; and
iv. A copy of the recorded plat delineating the public rights -of -way, dedicated
common areas and/or permanent recorded easements, when applicable.
b. If the permittee determines that the project is not in compliance with the approved plans, the
permittee shall submit an application to modify the permit within 30 days of completion of the
project or provide a plan of action, with a timeline, to bring the site into compliance.
10. OPERATION AND MAINTENANCE. The permittee shall provide and perform the operation and
maintenance necessary, as listed in the signed operation and maintenance agreement, to
assure that all components of the permitted on -site stormwater system are maintained at the
approved design condition. The approved operation and maintenance agreement must be
followed in its entirety and maintenance must occur at the scheduled intervals.
a. CORRECTIVE ACTIONS REQUIRED. If the facilities fail to perform satisfactorily, the
permittee shall take immediate corrective actions. This includes actions required by the
Division and the stormwater rules such as the construction of additional or replacement on -
site stormwater systems. These additional or replacement measures shall receive a permit
from the Division prior to construction.
b. MAINTENANCE RECORDS. Records of maintenance activities must be kept and made
available upon request to authorized personnel of the Division. The records will indicate the
date, activity, name of person performing the work and what actions were taken.
11. PERMIT RENEWAL. A permit renewal request must be submitted at least 180 days prior to the
expiration date of this permit. The renewal request must include the appropriate application,
documentation and the processing fee as outlined in 15A NCAC 02H.1045(3).
12. CHANGES TO THE PROJECT NAME, PERMITTEE NAME OR CONTACT INFORMATION.
The permittee shall submit a completed Permit Information Update Application Form to the
Division- within 30 days to making any one of these changes.
13. TRANSFER. This permit is not transferable to any person or entity except after notice to and
approval by the Director. Neither the sale of the project and/or property, in whole or in part, nor
the conveyance of common area to a third party constitutes an approved transfer of the permit.
a. TRANSFER REQUEST. The transfer request must include the appropriate application,
documentation and the processing fee as outlined in 15A NCAC 02H.1045(2). This request
must be submitted within 90 days of the permit holder meeting one or more of the following:
i. A natural person who is deceased;
ii. A partnership, limited liability corporation, corporation, or any other business
association that has been dissolved;
iii. A person or entity who has been lawfully and finally divested of title to the property
on which the permitted activity is occurring or will occur through foreclosure,
bankruptcy, or other legal proceeding.
iv. A person or entity who has sold the property, in whole or in part, on which the
permitted activity is occurring or will occur;
V. The assignment of declarant rights to another individual or entity;
vi. The sale or conveyance of the common areas to a Homeowner's or Property
Owner's Association, subject to the requirements of NCGS 143-214.7(c2),
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Post -Construction Stormwater Management
Permit No. SW8 230502
b. TRANSFER INSPECTION. Prior to transfer of the permit, a file review and site inspection
will be conducted by Division personnel to ensure the permit conditions have been met and
that the project and the on -site stormwater system complies with the permit conditions.
Records of maintenance activities performed to date may be requested. Projects not in
compliance with the permit will not be transferred until all permit and/or general statute
conditions are met.
14. COMPLIANCE. The permittee is responsible for complying with the terms and conditions of this
permit and the approved plans and specifications until the Division approves the transfer
request.
a. REVIEWING AND MONITORING FOR COMPLIANCE. The permittee is responsible for
verifying that the proposed BUA within each drainage area and for the entire project does
not exceed the maximum amount allowed by this permit. The permittee shall review and
routinely monitor the project to ensure continued compliance with the conditions of the
permit, the approved plans and specifications.
b. APPROVED PLANS AND SPECIFICATIONS. A copy of this permit, approved plans,
application, supplement, operation and maintenance agreement, all applicable recorded
documents, and specifications shall be maintained on file by the permittee at all times.
c. MAINTENANCE ACCESS. SCMs, stormwater collection systems, and vegetated
conveyances must be accessible for inspection, operation, maintenance and repair as
shown on the approved plans.
d. DIVISION ACCESS. The permittee grants Division Staff permission to enter the property
during normal business hours to inspect all components of the permitted project.
e. ENFORCEMENT. Any individual or entity found to be in noncompliance with the provisions
of a stormwater management permit or the requirements of the stormwater rules is subject to
enforcement procedures as set forth in NCGS 143 Article 21.
f. ANNUAL CERTIFICATION. The permittee shall electronically submit to the Division an
annual certification completed by either the permittee or their designee confirming the
projects conformance with permit conditions.
g. OBTAINING COMPLIANCE. The Director may notify the permittee when the permitted site
does not meet one or more of the minimum requirements of the permit. Within the time
frame specified in the notice, the permittee shall submit a written time schedule to the
Director for modifying the site to meet minimum requirements. The permittee shall provide
copies of modified plans and certification in writing to the Director that the changes have
been made.
h. OTHER PERMITS. The issuance of this permit does not preclude the permittee from
obtaining and complying with any and all other permits or approvals that are required for this
development to take place, as required by any statutes, rules, regulations, or ordinances,
which are imposed by any other Local, State or Federal government agency having
jurisdiction. Any activities undertaken at this site that cause a water quality violation or
undertaken prior to receipt of the necessary permits or approvals to do so are considered
violations of NCGS 143-215.1, and subject to enforcement procedures pursuant to NCGS
143-215.6.
Permit issued this the 6th day of June 2023.
NORTH CAR.�� l0OLINA ENVIRONMENTAL MANAGEMENT COMMISSION
C45
Douglas R. Ansel, Interim Director
Division of Energy, Mineral and Land Resources
By Authority of the Environmental Management Commission
Permit Number SW8 230502
Page 5 of 5

Post -Construction Stormwater Management
Permit No. SW8 230502
Attachment A
Certification Forms
The following blank Designer Certification forms are included and specific for this project:
• As -Built Permittee Certification
• As -Built Designer's Certification General MDC
• As -Built Designer's Certification for Permeable Pavement Project
• As -Built Designer's Certification for Contech Stormfilter Project
• As -Built Designer's Certification for Level Spreader and Vegetated Filter Strip MDC
A separate certification is required for each SCM. These blank certification forms may be copied and
used, as needed, for each SCM and/or as a partial certification to address a section or phase of the
project.
Page 1 of 1

Post -Construction Stormwater Management
Permit No. SW8 230502
AS -BUILT PERMITTEE CERTIFICATION
I hereby state that I am the current permittee for the project named above, and I certify by my
signature below, that the project meets the below listed Final Submittal Requirements found in NCAC
02H.1042(4) and the terms, conditions and provisions listed in the permit documents, plans and
specifications on file with or provided to the Division.
Check here if this is a partial certification. Section/phase/SCM #?
Check here if this is part of a Fast Track As -built Package Submittal.
Printed N
County of
personally appeared before me this
Signature
a Notary Public in the State of
do hereby certify that
day of , 20
and acknowledge the due execution of this as -built certification.
Wtness my hand and official seal
My commission expires
(SEAL)
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A. DEED �STRI ?�O. $1 ILIA ItECOF;R$
;
1. The deed restrictions and protective covenants have been recorded
Y or N
and contain the necessary language to ensure that the project is
maintained consistent with the stormwater regulations and with the
permit conditions.
2. A copy of the recorded deed restrictions and protective covenants
Y or N
has been provided to the Division.
3. Records which track the BUA on each lot are being kept. (See Note
Y or N
1
-
1. The SCMs are accessible for inspection, maintenance and repair.
Y or N
2. The access is a minimum of 10 feet wide.
Y or N
3. The access extends to the nearest public right-of-way.
Y or N
C.'.EASEI $
1. The SCMs and the components of the runoff collection / conveyance
Y N
system are located in recorded drainage easements.
or
2. A copy of the recorded plat(s) is provided.
Y or N
h'Ttforrgider�) lsts that
Yor N
1. The specific location of the SCM on the lot.
Y or N
2. A typical detail for the SCM.
Y or N
3. A note that the SCM is required to meet stormwater regulations and
that the lot owner is subject to enforcement action as set forth in
Y N
NCGS 143 Article 21 if the SCM is removed, relocated or altered
or
without prior approval.
E,= QP T .NfA P<_ ., INTJ,=-,NA, 0 ..-AQ C X,. . '.... r
Y; or N
1. The O&M Agreement is referenced on the final recorded plat.
Y or N
2. The O&M Agreement is recorded with the Register of Deeds and
Y N
appears in the chain of title.
or
IUD i�[ ��is;are
t ' C'�f � t,jfI fb
Y�or NJ
*jr3;���
Page 1 of 9

Post -Construction Stormwater Management
Permit No. SW8 230502
Y!'
Note 1- Acceptable records include ARC approvals, as -built surveys, and county tax records.
Provide an explanation for every requirement that was not met, and for every "N/A" below. Attach
additional sheets as needed.
Page 2 of 9

Post -Construction Stormwater Management
Permit No. SW8 230502
AS -BUILT DESIGNER'S CERTIFICATION GENERAL MDC
I hereby state that I am a licensed professional and I certify by my signature and seal below, that I
have observed the construction of the project named above to the best of my abilities with all due care
and diligence, and that the project meets the below listed General MDC found in NCAC 02H.1050 in
accordance with the permit documents, plans and specifications on file with or provided to the
Division, except as noted on the "AS -BUILT" drawings, such that the intent of the stormwater rules
and statutes has been preserved.
Check here if this is a partial certification. Section/phase/SCM #?
Check here if this is a part of a Fast -Track As -Built Package Submittal per .1044(3).
Check here if the designer did not observe the construction, but is certifying the project.
Check here if pictures of the SCM are provided.
Printed
Name
NC Registration
Number
SEAL:
Consultant's Mailing Address:
City/State/ZIP
Phone Number
Consultant's Email address:
i0 Circle N if the as -built value differs from the Plan. If N is circled, provide an explanation on Page 2.
OO N/E = not evaluated (provide explanation on page 2) OO N/A = not applicable to this SCM or project.
t1t 4"x6 j "� V'k q�VG 1 �$��#£
x s
¢
x...
h .[Ft a:.-L-
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s.
.
: 1 x ^ 9R " kvi: ii. x 'Y.. a3'� ewk
:1R5�.x'1 Yxxt
x1
,�ev`Oj i , i'.
1. The SCM achieves runoff treatment.
Y or N
2. The SCM achieves runoff volume match.
Y or N
3. Runoff from offsite areas and/or existing BUA is
Y or N
bypassed.
4. Runoff from offsite areas and/or existing BUA is directed
Y or N
into the permitted SCM and is accounted for at the full
build -out potential.
5. The project controls runoff through an offsite permitted
Y or N
SCM that meets the requirements of the MDC.
6. The net area of new BUA increase for an existing project
Y or N
has been accounted for at the appropriate design storm
level.
7. The SCM(s) meets all the specific minimum design
Y or N
criteria.
B. NE00ATBD $ATBACK$'/,BUA
1. The width of the vegetated setback has been measured
Y or N
from the normal pool of impounded waters, the MHW
line of tidal waters, or the top of bank of each side of
rivers or streams.
2. The vegetated setback is maintained in grass or other
Y or N
vegetation.
3. BUA that meets the requirements of NCGS 143-214.7
Y or N
b2 2 is located in the setback.
Page 3 of 9

Post -Construction Stormwater Management
Permit No. SW8 230502
Y or N
4. BUA that does not meet the requirements of NCGS 143-
214.7 (b2)(2) is located within the setback and is limited
to:
a. Publicly funded linear projects (road, greenway
sidewalk)
b. Water -dependent structures
c. Minimal footprint uses (utility poles, signs, security
lighting and appurtenances)
5. Stormwater that is not treated in an SCM is released at
Y or N
the edge of the setback and allowed to flow through the
setback as dispersed flow.
Y
1. A variation (alternative) from the stormwater rule
provisions has been implemented.
Y or N
2. The variation provides equal or better stormwater control
and equal or better protection of surface waters.
Y or N
i'
.t
Irl S
4' . pusi k%.v'iuw.=.,77
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1. Vegetated side slopes are no steeper than 3H:1 V.
Y or N
2. Side slopes include retaining walls, gabion walls, or
Y or N
other surfaces that are steeper than 3H:1 V.
3. Vegetated side slopes are steeper than 3H:1 V (provide
Y or N
su ortin documents for soils and ve etation .
11- A O, � ° N PRO�E(5T,1 N r
1. The inlets do not cause erosion in the SCM.
Y or N
2. The outlet does not cause erosion downslope of the
Y or N
discharge point during the peak flow from the 10 year
storm.
a
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34L>dayA'12. IeH-1+.M-: ai
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ti $�
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ON
._ - _
1. The SCM is accessible for maintenance and repair.
Y or N
2. The access does not include lateral or incline slopes
Y or N
>3:1.
N,,.,
i
Provide an explanation for every MDC that was not met, and for every item marked "N/A" or "ME",
below. Attach additional pages as needed:
Page 4 of 9

Post -Construction Stormwater Management
Permit No. SW8 230502
AS -BUILT DESIGNER'S CERTIFICATION FOR PERMEABLE PAVEMENT PROJECT
I hereby state that I am a licensed professional and I certify by my signature and seal below, that I
have observed the construction of the project named above to the best of my abilities with all due care
and diligence, and that the project meets all of the MDC found in NCAC 02H.1055 in accordance with
the permit documents, plans and specifications on file with or provided to the Division, except as
noted on the "AS -BUILT" drawings, such that the intent of the stormwater rules and the general
statutes has been preserved.
Check here if this is a partial certification. Section/phase/SCM #?
Check here if this is a part of a Fast -Track As -Built Package Submittal per. 1044(4).
Check here if the Designer did not observe the construction, but is certifying the project.
EJ Check here if pictures of the SCM are provided.
Printed
Name
NC Registration Number Date
SEAL:
Consultant's Mailing Address:
City/State/ZIP
Phone Number
Consultant's Email address:
OO Circle N if the as -built value differs from the Plan. If N is circled, provide an explanation on Page 2.
OO N/E = not evaluated (provide explanation on page 2) OO N/A = not applicable to this project or SCM
This Certification must be completed in coniunction with the General MDC certification under NCAC 02H.1050
G8[t3Uhfft 8 Certtficattort (I)IID� 105);
OAs built
®N,/E
®NfA
", r " i
A:' DESI(`aN IDO
,` ;`
,DR%► . ..
1. Washed aggregate base material has been used.
Y or N
2. The provided amount of permeable pavement surface area
Y N
is consistent with the approved plans.
or
3. The amount of non -roof adjacent built -upon area is
consistent with the approved plans and is directed onto the
Y N
permeable pavement surface and does not exceed the
or
required 1:1 ratio Aa/A
4. The runoff from adjacent pervious areas is prevented from
reaching the permeable pavement except for incidental,
Y or N
unavoidable runoff from stable vegetated areas.
5. The permeable pavement infiltrates the design volume to the
Y N
bottom of the subgrade within 72 hours.
or
6. If the permeable pavement was installed as a detention
system, the drawdown assembly releases the stormwater
Y or N
stor/ed in�t�hne a re ate in 2-5 days.
S B. Oi
1. The hydraulic properties and characteristics of the in -situ
Y N
soils conform to the soils report.
or
2. For infiltrating permeable pavement, the lowest point of the
Y N
system is a minimum of 2 feet above the SHWT.
or
3. For infiltrating permeable pavement, if the lowest point of the
system is less than 2 feet above the SHWT, the soils have
Y or N
been modified to assure drawdown within 72 hours.
Page 5 of 9

Post -Construction Stormwater Management
Permit No. SW8 230502
r r ',
i�i/�S_jjtitn°
�N/;'
; �Nla
4� The in -situ soils have been removed and replaced with
Y N
infiltration media in accordance with the approved Ian.
or
5. Infiltration media has been placed on to of in -situ sails.
Y or N
-
1. At least one capped observation well has been provided at
Y N
the low point of each permeable pavement area?
or
2. The subgrade is terraced in accordance with the approved
plans and has at least one capped observation well within
Y or N
each terrace section.
3. For PICP and concrete grid pavers, an edge restraint has
been used around the perimeter of the permeable
Y or N
pavement .
4. The subgrade for infiltrating permeable pavement was
graded when it was d and there was no reci itation.
Y or N
1. The infiltration rate of the pavement surface is at least 50
inches per hour using a head less than or equal to four
Y or N
inches.
2. After installation, the permeable pavement was protected
Y N
from sediment deposition.
or
3. The site is complete and stabilized.
Y or N
Provide an explanation for every MDC that was not met, or for every item marked "N/E" or "N/A"
below. Attach additional pages as needed:
Page 6 of 9

Post -Construction Stormwater Management
Permit No. SW8 230502
AS -BUILT DESIGNER'S CERTIFICATION FOR CONTECH STORMFILTER PROJECT
I hereby state that I am a licensed professional and I certify by my signature and seal below, that I
have observed the construction of the project named above to the best of my abilities with all due care
and diligence, and that the project meets the requirements of NCAC 02H.1050(15), has been
approved by the Division under the New Stormwater Technology MDC, meets the recommended
MDC listed in Chapter D-1 of the Stormwater Design Manual, and has been constructed in
accordance with the permit documents, plans and specifications on file with and provided to the
Division, except as noted on the "AS -BUILT" drawings, such that the intent of the stormwater rules
and the general statutes has been preserved.
Check here if this is a partial certification. Section/phase/SCM #?
Check here if this is part of a Fast -Track As -Built Package Submittal per .1044(3).
Check here if the Designer did not observe the construction, but is certifying the project.
Check here if pictures of the SCM are provided.
Printed
Name Signature
NC Registration Number
SEAL:
Date
Consultant's Mailing Address:
City/State/ZIP
Phone Number
Consultant's Email address
OO Circle N if the as -built value differs from the Plan/permit. If N is circled, provide an explanation on page 2
OO N/E = not evaluated (provide explanation on page 2) OO N/A = not applicable to this project or SCM.
This Certification must be completed in coniunction with the General MDC certification under NCAC 02H.1050
io
RE'n x�,K n.,�.. W d P Tr .as. aF
.. r . �:.
t
t
1. Inlets are located per the approved plans.
Y or N
2. A minimum 4' diameter by 2' deep sump is provided.
Y or N
B. ,Volume,7.Elevgtio,,,s'/,�otlstcuctiorf ,
1. The provided width, length and height of the detention area,
including the piped storage, are consistent with the approved
Y or N
Ian.
2. The bottom elevation of the detention area is consistent with
Y N
the approved plans.
or
3. The bypass elevation is consistent with the approved plan.
Y or N
4. The overflow elevation is consistent with the approved plan.
Y or N
5. The volume of water stored in the detention area is at least
Y N
0.75 times the treatment volume.
or
C. StotmFi11terfe -ia d $ stgit, :•
1 The as -built system meets the manufacturers specifications.
Y or N
2. The number of cartridges provided is consistent with the
Y or N
approved plans.
3. The Perlite Media has been used.
Y or N
4. In Nutrient Sensitive Waters (NSW) and for nutrient removal
Y or N
credit, the Phos hosorb Media has been used.
5. The StormFilter Media has a flow rate of 1 GPM/ft of media
Y or N
surface.
Provide an explanation for every MDC that was not met, or for every deviation from the permitted condition
below:
Page 7 of 9

Post -Construction Stormwater Management
Permit No. SW8 230502
AS -BUILT DESIGNER'S CERTIFICATION LEVEL SPREADER AND
VEGETATED FILTER STRIPS MDC
I hereby state that I am a licensed professional and I certify by my signature and seal below, that I
have observed the construction of the project named above to the best of my abilities with all due care
and diligence, and that the project meets the below listed Level Spreader and Vegetated Filter Strip
MDC found in NCAC 02H.1059 in accordance with the permit documents, plans and specifications on
file with or provided to the Division, except as noted on the "AS -BUILT' drawings, such that the intent
of the stormwater rules and statutes has been preserved.
Check here if this is a partial certification. Section/phase/SCM #?
Check here if this is a part of a Fast -Track As -Built Package Submittal per .1044(3).
Check here if the designer did not observe the construction, but is certifying the project.
Check here if pictures of the SCM are provided.
Printed
Name
NC Registration
Number Date
SEAL:
Consultant's Mailing Address:
City/State/ZIP
Phone Number
Consultant's Email address:
OO Circle N if the as -built value differs from the Plan. If N is circled, provide an explanation on Page 2.
OO N/E = not evaluated (provide explanation on paqe 2) OO N/A = not applicable to this SCM or project.
Consultant's' Certification NCAC 02H:1,059
„ ..
OAs-built
ON/E,"
ON/A t
A. SIZING
1. The length of the Level Spreader is a minimum of 10 feet
Y or N
per 1 cfs.
2. The Level Spreader receives flow directly from the
Y or N
Drainage Area, and is sized based on the flowrate for a
design storm of 0.75 inches per hour.
3. The Level Spreader receives flow from an SCM and is
Y or N
sized based on the drawdown rate of the design volume.
4. The Level Spreader has a flow bypass system for larger
Y or N
storm events.
5. The Level Spreader is sized to handle the 10 year storm
Y or N
flow and does not provide a flow bypass system.
6. The minimum width of the Vegetated Filter Strip is 30
Y or N
feet measured perpendicular to the level lip.
7. A blind swale or other means of ponding water is
Y or N
provided u slo a of the Level Spreader.
8. The blind swale provides for uniform overtopping into the
Level Spreader.
B. LEVEL SPREADER SPECIFICATIONS
1. The lip of the Level Spreader is at a uniform elevation
Y or N
and has a construction tolerance of ±0.25 inches at any
point along its length.
2. The Level Spreader is constructed of concrete or other
Y or N
stable material.
Page 8 of 9

Pust'ConntmctionStormwaiorManagement
Permit No. SW8 230502
3. The shape of the Level Sp eader is straight or convex in
Y or N
plan view.
4. Downslope of the Level Spreader, there is a 1-3 inch
Y or N
drop followed by a Transition Zone at least 12 inches
wide that is protected from erosion by aggregate or high
performance turf reinforcement matting.
C. FILTER STRIP SPECIFICATIONS
1 . The filter strip does not contain any draws or channels.
Y or N
2. The filter strip has been graded with a uniform transvers
slope of eight percent or less.
Y or N
3. The pH, compaction and other attributes of the first 12"
of soil within the filter strip have been adjusted to
promote plant establishment and growth.
4. The filter strip and side slopes have been planted with
non -clumping deep-rooted grass sod.
5. During construction, the soil was stabilized with
temporary measures until the permanent vegetation took
root, or the runoff was directed elsewhere until the
vegetation established.
Provide an explanation for every MDC that was not met, and for every item marked "N/K or "N/E",
below. Attach additional pages aSneeded:
Page 9 of 9

LOCA TION MAP "SITE & BUILDING DATA:
HOUSE IMPERVIOUS BREAKDOWN: 4,416 SF T 14 LF OF TRENCHIDRAIN 18.48EP 71 jjTVgVj187
EP)
DRIVEWAY/SIDEWALK = 799 SF (18.50 EP) (� (18.34 EP)
`1iNo� TOTAL = 5,512 SF TG 18.4 °
5,215 / 22,758 = 0.229 OR 237/ (18.51 EP) - ° CN - -
a E= 17.0 ° TG= 18.49°27,
PERVIOUS BREAKDOWN: R 2 � E
(s)
° ° \ 18.9FS ��--�
`F yo Cw$*SaD
DRIVEWAY = 1, 068 SF - J82 D � U S. 12 oo q
°°, `� TOTAL = 1068 SF °
TO = 18.4 2 EXISIIN"IPE ENGINEERING
°S� o 18.9 FS ONITORING WELL 6" IE = 16.9
SITE FT
Qe T E GENERAL NOTES. BOX OTTOM = 14.9 LICENSE # C-2710
1. NEW HANOVER COUNTY PARCEL NUMBERS.: , n�BORING 1-1 ENGINEERING
-
PIN = R04419-001-027-000 GROUND ELEV. = 18.0 LAND PLANNING
NOT TO SCALE Z SHWT DEPTH = 28 INCHES COMMERCIAL RESIDENTIAL
2. TOTAL PROJECT AREA: 22, 758 SF (0.52 AC.) � IE = 14.0 I �
J. EXISTING ZONING DISTRICT- R-20 \ SHWT ELEV. = 15.7 19.0 FS IE = 12.0
_ - 4. SITE ADDRESS: 6600 CARMEL TRAIL. P.O. BOX 4041
FINISHED GROUND ` 19.1 FS \\\\\\\\\\\\\\ I WILMINGTON, NC 28406
5. ASBUILT, BOUNDARY AND TOPOGRAPHIC SURVEY WETLANDS LINE
EDGE RESTRAINT TO BE INSTALLED ALONG ALL EXTERNAL EDGES OF PERFORMED AND PROVIDED TO CSD ENGINEERING BY \\\� \11 \\\\I WETLANDS LINE 910 791-4441
PAVERS AT TRANSITION TO FINISHED GROUND. GEOINNOVATION, PC C-2881 191 FS N 48" STORAGE PIS LAFLAT V. 12.0
6. VERTICAL DATUM = 88 50 19.2 FS ��\\\\\\\\\\\\ / "
A i \\\\\\\\\\\\\\\
7. DEEDBOOK 6514 PG 1561 INSTALL 2 C
IE - 14.0�
a a a a a' a a a SEGMENTAL PERVIOUS PAVERS 8. STORMWATER DRAINS TO HOWE CREEK SA;ORW 6 " SDR-3� TTER :
I ems$
G a (18-87-23) IN THE WHITE OAK RIVER BASIN.
a, B 9. ENTIRE SITE IS LOCATED WITHIN 575 FT OF SA-ORW JB
pO pO pO pO pO pO pO MIN 9 INCHES WASHED GRATE TOP 19.2 FS 19.1 FS i " Q Q
WATERS. 2 FORCEMAIN E
O �D �0 �0 0� �0 �� � CSTONE (#57 OR EQUIVALENT) "TG _ 16.8 � \\\\ � O � � -0,
�
10. NO SURFACE WATERS ARE LOCATED ONSITE. A 50 12 IE = 12.0 qeS}°°° 5Z6�0 " IE = 14.0 I °0 -0
FT SETBACK FROM NHW LINE IS LOCATED WITHIN THE \ \ 6 SDR-35 GUTTER W q
-----�-�-� PROPERTY BOUNDARY AND SHOWN.
III -III -III -III -III -III -III PREPARED SUBGRADE IE = 15.0 P VERS
W2 � P ,
SE
W W o
PERVIOUS PAVER DETAIL 19.4 FS
NTS 19.4 FS Qe$,° I Ceps
23 LF 12" DW- PE�
\ I EXISTING PIPE
CONTECH STORMFILTER I�
�y.aa
6 FT 1 FT 1 FT RIM = 16.0 i a
F�-0-)IE IN = 11.5 E s
d = 1.5 TIMES THE MAXIMUM STONE DIAMETER BUT NN�pL \ s,at'"l°doi05 \
B 5. maxim NOT LESS THAN 6". IE OUT = 11.0 00
°/ �NE'X' , Ue\S%°'Qaap56°
A ti \ W z
FORCE MAIN LINE Q
18" OF SAND \\i�\\j\\j\\j\\j\\/�� \ 0 Q
\ e odolo96l / CL U
FILTER FABRIC UNDER GRAVEL\�\\��\\��\\�� N
°Ln
CONCRETE LIP AND FOOTER p z "
TOP OF LIP TO BE 3" ABOVE �, �
EXISTING GROUND °ip56° I 00 p
TOP ELEVATION OF STRIP ON SAME ELEVATION
AND DIRECTLY ABUTS LEVEL SPREADER \ \\ o o J �\ °�k.��0 Q W z Z
4" PIPE FROM STORMFILTER N \ _ o \ \ °p�" �P�' Q v Q
�cl�o
BLIND SWALE �, �, �, �, �, �, �, \ \ (\ Q� ° �° ad z 0 = o
0
oOLU
o Q L z
q/ A/ A/ A/
oO 66 LF 4 DW- PE ��\ \���\` N CAROB
4" CLEANOUI` \
O _ SEAL
00 4" IE = 1a7 \ y�� _ 025483
0 I 5-4-23 `
A/
8.0 FT 50.0 FT VEG. FILTER \ / SE ET 0
LEVEL SPREADER/VEG. FI L TER DETAIL AE FL E J
�w
NOT TO SCALE LEVEL SPREADER/VEG. FILTER AN
LO
(SEE DETAIL THIS SHEET) 0 UN
I
� I
` D N
MATCHLINE A -A
U) SOP
LEGEND i O "Z� SU CE WATER SETBACK
fr► _ 50 FT RFA
EXISTING BOUNDARY r i
ADJACENT PROPERTY LINES
- EXISTING/PROPOSED EASEMENT
CONTOURS��C1E
PROP STORM DRAIN i ���� �`( �� MATCHLINE A -A DA TE.• 4-28-23
HORZ. SCALE.- 1' = 10'
PERT. SCALE. • N/A
PROP PERVIOUS PAVERS
DRAWN BY- RL W
CHECKED BY- HSR
PROP PAVERS ° \ PROJECT NO.: 22-0622
10 5 0 10 20 30
NNw Sheet No. Of 2
/ SCALE IN FEET.- 1 "= 10'
LS
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8
C
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10.7
10.9
10.9
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FRAME AI`
CAST -IN TOP SLAB BY
INLET
TOP SLAB PLAN VIEW
CARTRIDGES AND FLOW KIT NOT SHOWN
CONTECH TO CAST -IN
FRAME AND COVER
FLOW
INLET 1 PIPE
6"0 PVC
(12"0 OPENING)
6" EXTENDED BASE
180'
�1�►�II]�I):]�jq
LADDER
i
OUTLET 1 FLOW -- -ll
-
IV_ _
6" EXTENDED BASE
OUTLET
UMP
ONSTRUCTION
L� LOW BYPASS
I, (SEE INSTALLATION
NOTE G)
D. V
SYSTEM ACTIVATION DISK INSTALLED HERE. SLIP PLUG
SEE INSTALLATION INSTRUCTIONS.
PLAN VIEW
TOP SLAB NOT SHOWN FOR CLARITY
*EOR TO CONFIRM ALL ELEVATIONS
*18" CARTRIDGE REQUIRES 2.3' OF HEAD FROM OUTLET
INVERT TO WQ WATER SURFACE ELEVATION IN
UPSTREAM DETENTION
rT-----------1--T\
I I
I I� III
I I I I II III
I I I I I III
- 11 I 1 F
-- ALL-�-J
LOW KIT
4'-10"0
ELEVATION VIEW
RIM ELEV. 16.00'
TOP OF SYSTEM
ELEV. 16.00,
OUTLET
STUB q
iD
INLET 1 INVERT
ELEV. 1 1.50'
OUTLET 1 INVERT
�6" EXTENDED OUTSIDE BOTTOM
BASE ELEV.10.35'
SEE OUTLET DETAIL
(THIS SHEET)
SEALED OUTLET
RISER
BALLASVANTI-FLOTATION NOTE
6" EXTENDED BASE WAS ADDED TO THE DESIGN BY CSD ENGINEERING. IF CONTECH CANNOT
FORM AN EXTENDED BASE, ADDITIONAL PROVISIONS SHALL BE MADE SUCH THAT THE TOTAL
WEIGHT OF THE STORMFILTER STRUCTURE IS NO LESS THAN 11,700 POUNDS
BAND, TYPICAL
SEE DETAIL SHEET P3
SITE DESIGN DATA
FILTER MEDIA TYPE PERLITE
OUTLET DETAIL
(ILLUSTRATION ONLY)
MATERIAL LIST (PROVIDED BY CONTECH)
RISER
ND COLLAR OR BOOT
?"0 STUB
8" 0 STUB
6" EXTENDED BASE
MOLDED -IN CUT LINE
(SEE INSTALLATION NOTE E)
ROUT (BY CONTECH)
COUNT
DESCRIPTION
INSTALLED BY
2
18" PERLITE CARTRIDGE
CONTECH
3
7.5 GPM RESTRICTOR DISK (PURPLE POLY DISK)
CONTECH
1
2" PVC SLIP PLUG
CONTECH
1
40A FLOWKIT
CONTECH
1
SF ACTIVATION DISK
CONTECH
1
18" SEALED OUTLET RISER
CONTECH
1
STEPS, P10CTS, LANE LADDER, OR EQUIV.
CONTECH
1
SEALANT FOR JOINTS
CONTRACTOR
1
36"0 x 4" FRAME AND COVER, EJ001580008A01 CAST -IN
CONTECH
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PERFORMANCE SPECIFICATION
U 2UJI
}
FILTER CARTRIDGES SHALL BE MEDIA -FILLED, PASSIVE, SIPHON ACTUATED, RADIAL FLOW, AND SELF CLEANING. RADIAL MEDIA DEPTH
SHALL BE 7-INCHES. FILTER MEDIA CONTACT TIME SHALL BE AT LEAST 38 SECONDS.
C:)J
SPECIFIC FLOW RATE SHALL BE 1 GPM/SF (MAXIMUM). SPECIFIC FLOW RATE IS THE MEASURE OF THE FLOW (GPM) DIVIDED BY THE MEDIA
J c
O
SURFACE CONTACT AREA (SF). MEDIA VOLUMETRIC FLOW RATE SHALL BE 6 GPM/CF OF MEDIA (MAXIMUM).
O
�
2
GENERAL NOTES
1. CONTECH TO PROVIDE ALL MATERIALS UNLESS NOTED OTHERWISE.
ry
2. FOR FABRICATION DRAWINGS WITH DETAILED STRUCTURE DIMENSIONS AND WEIGHT, PLEASE CONTACT YOUR CONTECH ENGINEERED
O
SOLUTIONS LLC REPRESENTATIVE. www.ContechES.com
I-
3. STORMFILTER WATER QUALITY STRUCTURE SHALL BE IN ACCORDANCE WITH ALL DESIGN DATA AND INFORMATION CONTAINED IN THIS
cf)
DRAWING. CONTRACTOR TO CONFIRM STRUCTURE MEETS REQUIREMENTS OF PROJECT.
U
4. STRUCTURE SHALL MEET AASHTO HS-20 LOAD RATING, ASSUMING EARTH COVER OF 0'- 5', AND GROUNDWATER ELEVATION AT, OR
BELOW, THE OUTLET PIPE INVERT ELEVATION. ENGINEER OF RECORD TO CONFIRM ACTUAL GROUNDWATER ELEVATION. CASTINGS
SHALL MEET AASHTO M306 LOAD RATING AND BE CAST WITH THE CONTECH LOGO.
Z
N
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5. STORMFILTER STRUCTURE SHALL BE PRECAST CONCRETE CONFORMING TO ASTM C-478 AND AASHTO LOAD FACTOR DESIGN METHOD.
O
INSTALLATION NOTES
±'aug
A. ANY SUB -BASE, BACKFILL DEPTH, AND/OR ANTI -FLOTATION PROVISIONS ARE SITE -SPECIFIC DESIGN CONSIDERATIONS AND SHALL BE
y
SPECIFIED BY ENGINEER OF RECORD.
93
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B. CONTRACTOR TO PROVIDE EQUIPMENT WITH SUFFICIENT LIFTING AND REACH CAPACITY TO LIFT AND SET THE STORMFILTER
STRUCTURE.
�J111I W
C. CONTRACTOR TO INSTALL JOINT SEALANT BETWEEN ALL STRUCTURE SECTIONS AND ASSEMBLE STRUCTURE.
A015�
D. CONTRACTOR TO PROVIDE, INSTALL, AND GROUT INLET PIPE(S). ALL PIPE CENTERLINES TO MATCH PIPE OPENING CENTERLINES.
E. CONTRACTOR TO PROVIDE AND INSTALL CONNECTOR TO THE OUTLET RISER STUB. STORMFILTER EQUIPPED WITH A DUAL DIAMETER
0 -
HDPE OUTLET STUB. IF OUTLET PIPE IS LARGER THAN 8 INCHES, CONTRACTOR TO REMOVE THE 8 INCH OUTLET STUB AT MOLDED IN
DATE:
SCALE
CUT LINE. COUPLING BY FERNCO OR EQUAL AND PROVIDED BY CONTRACTOR.
04/25/23
3/8"
= 1'-01,
F. CONTRACTOR TO TAKE APPROPRIATE MEASURES TO PROTECT CARTRIDGES FROM CONSTRUCTION -RELATED EROSION RUNOFF.
DESIGNED
DRAWN
G. CONTRACTOR TO INSTALL SUPPLIED PLUG IN CONSTRUCTION FLOW BYPASS WHEN SYSTEM IS BROUGHT ON LINE (PRESSURE FIT ONLY,
BY
BY
DO NOT GLUE)'
CHECKED:
APPROVED:
STRUCTURE WEIGHT
CONTECH
PROJECT No.:
SEQUENCE No.:
APPROXIMATE HEAVIEST PICK = 6000 LBS. OF 2 PIECES BARG
742863
10
BASE SECTION SHIPPED WITH CARTRIDGES INSTALLED PROPOSAL LAYOUT 1A
SHEET:
1
MAX FOOTPRINT = 04'-10" DRAWING 5761 / 452888
1 of
FINISHED GROUND
EDGE RESTRAINT TO BE INSTALLED ALONG ALL EXTERNAL EDGES OF
PAVERS AT TRANSITION TO FINISHED GROUND.
d d a ° SEGMENTAL PERVIOUS PAVERS
e d d ° d d ° Q d ° °
d ° d ° d° dd °d dd
d d °d d
MIN 9 INCHES WASHED
STONE (#57 OR EQUIVALENT)
-III I � IIIII � IIIII � II
III-III-III-1 I - III -III -III PREPARED SUBGRADE
PERVIOUS PA VER DETAIL
NTS
CONSTRUCTION SEQUENCE FOR PERVIOUS CONCRETE/PAVERS:
STEP 1 - ENSURE ACCEPTABLE CONDITIONS FOR CONSTRUCTION
STEP 2 - UNDERCUT AREAS AND REPLACE WITH SAND, INSTALL MONITORING WELL
STEP 3 - PLACE AND COMPACT AGGREGATE BASE
STEP 4 - INSTALL PAVER COURSE
STEP 5 - PROTECT THE PAVERS THROUGH PROJECT COMPLETION
* SEQUENCE ABOVE SHOULD BE UTILIZED AFTER OTHER SITE IMPROVEMENTS IN
AREA WHERE PERVIOUS CONCRETE/PAVERS WILL BE INSTALLED HAVE BEEN
COMPLETED AND WHEN HEAVY EQUIPMENT WILL NO LONGER BE MOVING ONTO THE
AREA WHERE THE PERVIOUS MATERIAL WILL BE INSTALLED.
** REFERENCE NCDENR STORMWATER BMP MANUAL PART C. SECTION C-5 FOR
EXPANDED PROCEDURES UNDER EACH STEP LISTED ABOVE.
6" SDR-35
INV = 9.0
2" SDR-21
INV = 9.0
CmSD
ENGINEERING
LICENSE # C-2710
ENGINEERING
LAND PLANNING
COMMERCIAL / RESIDENTIAL
P.O. 80X 4041
WILMINGTON, NC 28406
[phone]
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STUB
INFORMATION
PLAN VIEW
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SEAL
PIECE
STUB INVERT
SYSTEM
INVERT
6"0 STUB Al
12.00
12.00
3 FT x 5 FT PRECAST CONCRETE BOX
_
= 025483 =
6"0 STUB A3
14.00
12.00
%z 1'-7" 6
6"0 STUB 61
5- 31- 23
llllllllsllllll\\\\`\\``\\\
6"0 STUB B1
15.50
12.00
8" 0 STUB B3
14.00
12.00
6"0 STUB C1
14.00
12.00
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15'-9Yz'
6"0 STUB C1
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RISER INFORMATION
PIECE
RIM ELEV.
SYSTEM
INVERT
30" 0 RISER A2
18.00
12.00
30" 0 RISER B2
18.00
12.00
*EOR TO CONFIRM ALL ELEVATIONS
NOTES
• ALL RISER AND STUB DIMENSIONS ARE TO CENTERLINE.
• ALL ELEVATIONS, DIMENSIONS, AND LOCATIONS OF RISERS AND INLETS, SHALL BE VERIFIED
THE UNDERSIGNED HEREBY APPROVES THE ATTACHED
BY THE ENGINEER OF RECORD (EOR) PRIOR TO RELEASING FOR FABRICATION.
(P5) PAGES INCLUDING THE FOLLOWING:
ASSEMBLY
• ALL FITTINGS AND REINFORCEMENT COMPLY WITH ASTM A998.
• PIPE STORAGE = 1,558 CF
SCALE: 1" = 10'
• MAINLINE PIPE GAGE = 14
• ALL RISERS AND STUBS ARE 23/3" xy" CORRUGATION AND 16 GAGE UNLESS OTHERWISE
• WALL TYPE =SOLID
LOADING: H2O
NOTED.
• DIAMETER = 48"
PIPE INV. = 12'±
• RISERS TO BE FIELD TRIMMED TO GRADE AS REQUIRED, BY CONTRACTOR.
• FINISH = ALT2
• CORRUGATION = 2 2/3x1/2
• QUANTITY OF PIPE SHOWN DOES NOT PROVIDE EXTRA PIPE FOR CONNECTING THE SYSTEM TO
EXISTING PIPE OR DRAINAGE STRUCTURES. OUR SYSTEM AS DETAILED PROVIDES NOMINAL
INLET AND/OR OUTLET PIPE STUB FOR CONNECTION TO EXISTING DRAINAGE FACILITIES. IF
ADDITIONAL PIPE IS NEEDED IT IS THE RESPONSIBILITY OF THE CONTRACTOR.
CUSTOMER DATE
• ALL ACCESS CASTINGS ARE THE RESPONSIBILITY OF THE CONTRACTOR AND ARE NOT
SUPPLIED BY CONTECH.
me design ana information shown on this drawing is p,o,ided
n eng'Ineered sownons uc p•conreoh•I. Neuher m'Is
comecetothep,o;e"owner engineerandcon(re-hi,
tlrawing.norry thereof repreduedo,
OP21IONTECH
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48" O UNDERGROUND DETENTION SYSTEM - 742863-015
PROJECT No
742863
SEQ, No.'
015
DATE:
4/24/2023
DESIGNED
DRAWN:
.. th,puaed
modified in any mannerwimoutme priorwrinemm�sentor��40
`fir•
Comeoh. Failureto oomply'Is done oohs uses own nsKand
Contech expressly disclaims any liability or responsibility for
ENGINEERED SOLUTIONS LLC
CMP DETENTION SYSTEMS
6600 CARMEL TRAIL
BY
BY
ouch uae
If dlscre beN+ the Iled Information which
panaes s°pp upon
www.ContechES.com
CONTECH
W I L M I N G TO N N C
CHECKED:
APPROVED:
the tlrawing Is basetl and actual veld conditions are encountered
s -work progresses. these discrepanaes must be reposed
� Contech immediately for re-evaluation of the design. Contech
7037 Ridge Road, Hanover, MD 21076
PROPOSAL
,
SITE DESIGNATION: CMP
BY
SHEET NO..
cceptanoliabilityro,designsbaaedonmiaaingincompleteor
443-457-1500 410-740-8490 410-740-8492EAx
DRAWING
QE P5
AR
DATE
REVISION DESCRIPTION
BY
atelnfmmanonsuppfiled byothera
TRAFFIC RATED CAP FLUSH
WITH FINISHED SURFACE
d d
d O °
d ° d °
d O a d d °d d
d
°d
10
0
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0
0O O O OOOOOOOO
O O O O O
OIr
r�
x
2 FT BELOW BASE 4" PERFORATED PVC
BOTTOM O
O
MONI TORING WELL
NTS
GRATE TOP
ELEV. = 12.0
GROUND ELEV.
ELEV. = 11.5
6" SDR-35
6" SDR-35 INV=9.0
INV = 9.0
o
2 FT SUMP
FOR CLEANOUT
BOX /E= 70
0 O 0000 0000 00(
SECT/ON VIEW
FLOAT ELEV. = 9.0
2" SDR-21
INV = 9.0
1 FT MIN OFF BOTTOM
BOTTOM OF BOX = 6.5
000
ont
6" ABC STONE MIN
MIN (4) 4" HOLES CORED'
THROUGH BOTTOM OF BOX
PUMP MODEL: TSURUMI NK2-15
110 V, WITH TS-304 FLOAT
SEMI -VORTEX DEWATERING PUMP
PUMP STRUCTURE
NOT TO SCALE
10 5 0 10 20 30
SCALE IN FEET.• 1 "= 10'
N
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DA TE.• 4-28-23
HORZ. SCALE.- 1 " = 10'
VERT. SCALE.- N/A
DRAWN BY' RL W
CHECKED BY' HSR
PROJECT NO.: 22-0622
Sheet No. 2 Of 2