SWA000198_EZ and OM_20230705

SUPPLEMENT-EZ COVER PAGE
I FORMS LOADE,
PROJECT INFORMATION
1 1 Project Name Rehoboth Flex Space
2 Project Area ac 3.55
3 Coastal Wetland Area ac None
4 Surface Water Area(ac) None
5 Is this project High or Low Density? H!q h
6 Does this project use an off-site SCM? No
COMPLIANCE WITH 02H.1003(4)
L87Width of vegetated setbacks provided Ifeetl N/A
Will the vegetated setback remain vegetated? N/A
If BUA is proposed in the setback,does it meet NCAC 02H.1003 4 o-d? N/A
Is streambank stabilization proposed on this project? No
NUMBER AND TYPE OF SCMs:
11 Infiltration System _
12 Bioretention Cell
13 Wet Pond
14 Stormwater Wetland
15 Permeable Pavement
16 Sand Filter 1
17 Rainwater Harvesti RWH
18 Green Roof
19 Level Spreader-Filter Strip LS-FS
20 Disconnected Impervious Surface DIS
21 Treatment Swale
22 Dry Pond
23 IStormFilter
24 Silva Cell
25 Bayfilter
26 Filterra
FORMS LOADED
DESIGNER CERTIFICATION
27 Name and Title: Richard L.Modlin
28 O anization: Richard L.Modlin PE
29 Street address: 7215 Terrace Drive
30 Ci ,State,Zip: Charlotte,NC 28211
31 Phone numbe s: 980.322.4191
32 Email: [e-mail]
Certification Statement:
I certify,under penalty of law that this Supplement-EZ form and all supporting information were prepared under my direction or supervision;that the
information provided in the form is,to the best of my knowledge and belief,true,accurate,and complete;and that the engineering plans,
specifications,operation and maintenance agreements and other supporting information are consistent with the information provided here.
DesisAner ���
CAR
ti
Q g :ure of Dqligner
Q SEAL
14937
,�AygR L. VN( �o
"Seal hqe Date

DRAINAGE AREAS
t .Is this a high density project? Yes
2 If so,number of drainage areas/SCMs i
3 Does this project have low density areas? No
4 If so,number of low density drainage areas 0
Is all/part of this project subject to previous rule
5 versions? No
CLICK TO LOAD FORM

Waxhaw,NC UNION County
Richard L.Modlin,Richard L.Modlin,PE
Rehobeth Flex Space
0 � ram-ai
Waxhaw, NC UNION County
NCE)ENK
Richard L.Modlin,Richard L.Modlin,PE
Application
Type of application: New Permit
Only complete application packages will be accepted and reviewed.A complete package includes all of the items in the
checklist below.Add any comments,and indicate the page or plan sheet number where the following information can be found.
Please indicate that you have provided the following required information by initialing in the space provided next to each item.
Part I:Submittal Checklist
Item Notes/Comments Initials
1 Original and one copy of this application form(all worksheets)and the permit X RM
application fee.For applications submitted to the DEMLR regular permitting
program,the fee is$505 payable to NCDENR.For Express Review,click on
the link below for information and fee schedule.Contact the appropriate
regional office Express Review Coordinator to schedule the required pre-
annlirAtinn msetina
Click here for Er;. smitting info
2 A USGS map identifying the site location.If the receiving stream is reported Included in calculations RM
as class SA or the receiving stream drains to and is within 1/2 mile of SA
waters,then include the 1/2 mile radius on the map.
3 A copy of the most current property deed. Copies attached RM
4 Two copies of additional calculations(as needed).Sealed,signed and dated. X RM
5 Two sets of sealed,signed,&dated full-sized plans of the entire site at a X RM
readable scale,including:
a.Project name,engineer and firm,revision number and dates. X RM
b.Location map with street names and SR numbers,legend,north arrow, X RM
scale.
c.Dimensioned property/project boundary with bearings&distances. X RM
d.The boundaries of all surface waters,regulatory flood zones,and X RM
protected riparian buffers or a note on the plans that none exist.
e.The boundaries of all vegetated or protected riparian buffers. NA RM
f.Site layout showing all built-upon areas,drainage features,stormwater X RM
collection systems(inlets,outlets,swales,pipe elevations,slopes and
diameters),and SCMs at ultimate build-out.
g.Existing contours,proposed contours,spot elevations,and finished floor X RM
elevations.
h.Existing drainage(including off-site),drainage easements,pipe sizes, X RM
runoff calculations.
i.Drainage area boundaries(included in the main set of plans,not as a X RM
separate document).
j.Existing and proposed maintenance access routes,utility easements, X RM
drainage easements,public rights-of-way etc.
k.A construction sequence that shows how the SCMs will be protected X RM
from sediment until the entire drainage area is stabilized.
6 Two sets of sealed,signed,&dated full-sized plan details of each SCM(or X RM
typical if appropriate)in both plan view and cross-section at a scale of V_
30'or larger,including:
a.Dimensions,side slopes,length to width ratios and elevations with a X RM
benchmark for clean-out if appropriate.
b.All applicable conveyance devices,including: bypass structure, X RM
pretreatment area,flow distribution device,underdrains,outlet device,
outlet dissipater and level spreader.
c.A table of elevations,incremental volumes and accumulated volumes(if X RM
applicable).
d.Specifications for applicable materials,such as planting media, X RM
aggregate,sod,underdrains,outlet devices,etc.
STORM-EZ 12/27/2022
Version 1.4 Application Page 1 of 13

Waxhaw,NC UNION County
Richard L.Modlin,Richard L.Modlin,PE
7 Two sealed,signed,&dated planting plans for each SCM(or typical)at a RM
scale of 1"=20'or larger,as applicable,including:
a.The locations of each species and a planting detail. RM
b.A table summarizing the size,spacing and total quantity of each plant RM
species that should be used.
c.The source nursery for the plants. RM
d.A one-time fertilizer specification to establish plants if necessary. RM
S A soils report based on field evaluation indicating the SHWT elevations included in drainage RM
within the footprints of the proposed SCM(s).Provide a map of the boring calculations
locations with the existing elevations and boring logs.For infiltration SCMs,
the report shall include the soil type,infiltration rate and method for
determining the infiltration rate.Soils information shall be signed and sealed
9 A copy of the signed and notarized operation and maintenance(O&M) x RM
agreement.
10 A copy of the proposed deed restrictions protecting the SCMs and limiting WA RM
the built-upon area so that it does not exceed the capacity of the SCM(s)or
the high density threshold(as applicable).
NCDENR Deed Restriction Forms
11 For corporations and limited liability corporations(LLC):Documentation from Attached page from NC RM
the NC Secretary of State or other official documentation,which supports the Department of Secretary of
titles and positions held by the persons listed in the Contact Information State website,along with
section.The corporation or LLC must be listed as an active corporation in Articles of Incorporation
good standing with the NC Secretary of State,otherwise the application will
hp.rPturnPH
NC Dept of the Secretary of S+a'-
12 A copy of the lease agreement or pending sales agreement if applicable. N/A RLM
STORM-EZ 12/27/2022
Version 1.4 Application Page 2 of 13

Waxhaw,NC UNION County
Richard L.Modlin,Richard L.Modlin,PE
Part II:General Project and Applicant Information
Project Name: Rehobeth Flex Space Date: 12-Dec-22
Project Street Address: 208 Rehobeth Rd Lat: -80-45-01
City: Waxhaw I Zip: 28173 Long: 34-55-21
Directions to Project: from the intersection of S.Main St(NC 75)and Rehobeth Rd,head County: UNION
(from nearest intersection) southwest on Rehobeth Rd approximately 500 ft. NON-COASTAL
Project Applicant: Rehobeth Business Park LLC, Michael E.Anspach-Manager
(identify the corporation,organization,property owner,designated
government official,etc.which owns the nroiecf.)
Owner/Signing Offical's Name: Michael E.Ans ach
Title: Manager
Address: 1206 Wa newood Drive
City: Waxhaw
State: NC
Zip: 28173
Phone: O 843-588-5107 M 704-575-6910
Fax:
Email: michaelo3dountopartners.com
Status of applicant: Owner
River Basin: Catawba
Receiving Stream(s): Rone Branch
Stream Class(es): C
Surface Water Area(ac): NA Coastal wetland area(ac): NA
Total property area(ac): 3.55 Total project area(ac): 3.55
Goals/characteristics: YES Volume Matching(LID) MNO
Drains to an offsite stormwater system
NO Low Density Within 575'of Saltwater ORW
YES High Density Within 5 miles of a public airport
Briefly summarize how the stormwater runoff will be treated:
Runoff from the impervious building and parking areas will be directed to surface collection systems and directed to a
sand filter basin that will be sized to meet the water quality volume requirement,and will attenuate the developed peak
Part III:Permit Information
Status of construction:I Not Started
Other permits needed: YES Sedimentation&erosion control MNO
404 Permit if401 Certification
NO CAMA Major Permit Isolated Wetlands Permit
NO Threatened&Endangered Species NPDES Industrial Stormwater Permit
If an application for this project has been previously returned,provide the original project number and previous name of the project:
NA
Provide the permit type,number and issue date for any permits that have already been obtained for this project:
N/A
If claiming vested rights,then identify(and attach)the supporting documents and approval dates:
Approval of a site-specific development plan or PUD Approval date:
Valid building permit Issue date:
Other Date:
Not Started _
Point of Contact:r_ Phone number:
STORM-EZ 1 212 3/2 0 2 2
Version 1.4 Application Page 3 of 13

Waxhaw,NO UNION County
Richard L.Modlin,Richard L.Modlin,PE
Part IV:Additional Contact Information
(Optional) Additional Contact Rehobeth Business Park LLC
Person/Orginization:
Signing Official&Title: Michael E.Anspach,Manager
Street address: 1306 Waynewood Drive
City,State,Zip: Waxhaw,NO 28173
Phone number(s): O 843-588-5107 M 704-575-6910
Email: michael•d dountooartners.com
(Note:Person/Organization noted above may be contacted for additional project information if
applicant cannot be reached.)
Part V.Consultant Information
Complete this section if you wish to designate authority to another individual or firm so that they may provide information on your
behalf for this project(such as addressing requests for additional information).
Consultant: Richard L.Modlin
Firm: Richard L.Modlin,PE
Street address: 7215 Terrace Drive
City,State,Zip: Charlotte,NO 28211
Phone number(s):[980-322.4191
Emaild nchardmochn(iatt.net
Part VI:Property Owner/Applicant Certification
I,(the Owner&Applicant listed above), Michael E.Anspach,Manager ,certify that the information included
on this permit applicant form is,to the best of my knowledge,correct and that the project will be constructed in conformance with the
approved plans,that the required deed restrictusion and protective covenants will be recorded,and that the proposed project complies
with the requirements of the applicable state sto water rules and requirements.
Signature:
�f Date: I✓
1, _ /IC i =� �] iz S�� a Notary Public for the State of `l(�'`��1 ✓rJ f r\C.�
County of do hearby certify that
personally appeared before me this ja day of t]r`r ,i b. • _ `2is 2Z ,
and acknowledge the due execution of the application for a stor water permit.
Witness my hand and official seal,
TRAVIS HAUSER
Notary Public-North Carolina
Union County
My Commission Expires Jun 6,2024
My commission expires 1t//,, � 7
Seal
STORM-EZ 12/13/2022
Version 1.4 Application Page 4 of 12

Rehobeth Flex Space
Waxhaw,NC UNION County
Catawba River Basin MCDENR
RAINFALL&CALCULATION DATA
Project County: UNION
Project City: Waxhaw
Rainfall Source: Charlotte
Storm Event Depth
(inches)
First Flush/WQV 1.00
P9q' 1.40
Loaded Rainfall: User Defined P95 1.86
Des' n Storm: P90 1-yr,24-hr 2.95
Calculation Method Discrete SCS Method, 2- r,24-hr 3.56
Pre-Post 10-yr,24-hr 5.21
(Minimum Design Storm=P90 for non-SA, 1-yr,24-hr for SA) 25-yr,24-hr 6.24
50-yr,24-hr 7.09
NOTE. Please use the Storm-EZ calculation sheets to document the stormwater design 100- r,24-hr 7.97
and create the O&M Agreement. Highlighted Storm is Design Storm
PROJECT INFORMATION
Total Property Area 3.00 acres Total Impervious Area j 2.43 i acres
Total Coastal Wetlands Area 0.00 acres Project%impervious area 81%
Total Surface Water Area 1 0.00 acres �^
Complete the breakdown of impervious area for the project ALL AREAS ARE IN SQUARE FEET
Basin Information Entire Site
Receiving Stream name Rone Branch Use Worksheet Data? Yes
Stream Class C Data in italics is derived from application
Stream Index Number 11-138-4 forms and land use data worksheets and
Total Drainage Area 130,502 cannot be changed by user.
On-Site Drainage Area(so 130,502
Offsite Drainage Area(sf) 0
Proposed Impervious Areas 105,840
%Impervious Area total 81%
Impervious Surface Area Entire Site
On-Site Buildin s/Lots s 45.000
On-Site Streets s
On-Site Parki s 36,579
On-Site Sidewalks fs 21,425
Other On-Site s 2,836
Future s
Off-site (sf)
Existin BUA (sf)
Total 105,840
STORM-EZ 12/23/2022
Version 1.4 Project Data Page 6 of 13

Rehobeth Flex Space 424
Waxhaw,NC UNION County
Catawba River Basin NCDE K
Drainage Area,4' 1 I of �ri��i�
PRE-DEVELOPMENT LAND USE CALCULATIONS
Pre-Development Land Use: Area
HSG Land-use CN a acres %
B Impervious 98 9,222 0.21 7.0716
B Woods 55 60.473 HE 46.34%
B Pasture or Open Space 61 60,807 1.40 46.599/6
Subtotal:l 130,502 3.00
Note:Enter BOA Draining to
Permeable Pavement Below
User Defined Drainage Areas: Comp. Area
HSG Description CN Area(sf.) ac. Inv
B D.00 0.00%
Subtotal: 130,502 3.OD 7.07%
Existing Permeable Pavement linfiltration):
Soil Gravel Total Orifice Orifice
HSG PavemerH Area Additional BUA InfiRratio Vold Space Gravel Dia. Height BUA% Has Synthetic D.S.
n Rate Depth L(ner9 BMP
SCM# Description (91) (so (imhr) (%) I (in) I (in) (in)
100
Existing Green Roofs:
DSD PAW D, Area DS SCM# Notes
SCM# Description (in) ;%) tin) (sf) (acres)
150 1 AD 0.00
Land Use Summary: Area sf.
From Land Use Tables: 130,502 3.00 acres
Permeable Pavement+Additional BUA: 0 0.00 acres
Green Rants: 0 0.00 acres
Preserved Surface Waters&Nan-Coastal Wetlands: 0.00 acres
Preserved Coastal Wetlands: 0.00 acres
Total Site Area: 130,02 3.00 acres
Pre-Development SCMs: Drainage Area
WQVolume Imp. Open
Provided s Downstream
SCM# SCM Type HSG 9222 1212BO SCM
200
Design Storm Runoff Fate Summary:
Rainfall Volume= 4.19 acre-inches = 15,225 cf
Runoff Reduction Components:
Natural Infiltration&ET= -3.94 acr&4nches = -14,317 cf
Disconnected Impervious Surfaces= 0.00 acre-inches = 0 of
SCM Infiltration= 0.00 acre-inches = 0 cf
Permeable Pavement Infiltration= 0.00 acre-inches = 0 cf
Green Roof ET= 0.00 acre-lnches = o of
Post Filtration Discharge= 0.00 acre-lnohes =_ 0 of _
Total Runoff Reduction= .3.94 acre4nches = -14,317 cf
SCM Treatment:
Treated SCM Outflow= 0.00 acre-lnches = 0 cf
Untreated Surface Runoff= 0.25 acre-inches = 908 cf !
The Pre-Development project area contains 9222 sf of built upon area,resulting in an overall density of 7.07%.
STORM-EZ 12t23=22
Version 1.4 Pre-Development Page 6 of 13

Rehobeth Flex Space ®�A
Waxhaw,NC UNION County L.l
Catawba River Basin NCDENR
Drainage Area# 1 Of 1
POST-DEVELOPMENT LAND USE CALCULATIONS
Permeable Pavement: _
Inffit on Total Has Orifice Orifice Down-
Pavement Area Additional BUA Void Space Gravel Infiltration Detentlon
HSG Pvmt Type Rate Depth Synthetic Dia. Height stream Check Check
SCMB (sf) (acres) j (so (acres) (k Ahr) M (In) Liner? (in) fin) SCM
Soo a 0.00 0.00 No
Green Roofs:
DSD PAW 0, Area Retrofit? Downstream Comments
SCM# (in) (%) (in) (sfi (acres) SCMtl
r 600 1,10 j I I 1 0.00 No
ResiderWal Lot CN Calculator(Excluding R/W end dedicated agens ces):
Lot Area a of Lots Max Imp I Lot %hnp Woods 1 Lot Open Space l Lot Avg Lot sae
(af.) iac.I (s9 (s� (sQ
0.00
RemaininG Land Use: Area
HSG Land-Use CN acres %
B 1.panrieUs 98.0 105,840 2.43 81,10%
B Open Space(Managed Open Spate) _61.0 24,662 0.57 18.90%
Permeable Pavement+BUA: NIA 0 0.00 0.00%
Green Roofs: NIA 0 0.00 0.00%
Sub-Total: 130 502 3.00 100.0%
Land M(cluded or Pardah Ekcluded from Volume Calculations: ef. ac
Surface Waters&Non-Coastal Wetlands: 0 0.00
Coastal Wetlands: 0 0.00
Total Site Area: 130,502 3.00
Design Storm Run aie Summary:
Rainfall Volume= 4.19 acre-inches = 15,225 cr
Runoff Reduction Components:
Natural Infiltration&ET= -1.32 acre-inches = -4,798 cr
Disconnected Impervious Surfaces= 0..00 acre-incnes = o cr
SCM Infiltration= -0.14 acre-inches = -497 of
Permeable Pavement Infiltration= 0.00 acre-inches = 0 cf
Green Roof ET= 0.00 acre-inches = 0 cr
Post Filtration Discharge= .0.41 ecre-inches = -1,490 cf
Total unoff Reduction= -1.07 acre-inches = -fi,
STORM-F2 12r23f2022
Version 1.4 Post Development Page 7 of 13

Rehobeth Flex Space ® �
Waxhaw,NC UNION County
•�' Catawba River Basin HCDEHR
Drainage Area# 1 of 1
POST-DEVELOPMENT LAND USE CALCULATIONS
SCM Treatment:
Treated SCMOuMow= -2.33 acre-inches = -8,441 Cf
Untreated Surface Runoff= 0.00 acre-inchas 0 Cf
Pre-Development Runoff= 0.25 aor 4-hes = 908 d �
Werence= -0.25 acre-inches 9-08 cf
The Post-Development project area contains 105840 at of built upon area,resulting in an overall density of 81.17,
STORWEZ 12232022
Version 1.4 Pnst Develapment Page 8 of 13

Rehoboth Flex Space Wl"XiW
Warthaw,NC UNION County
Catawba River Basin NCE04R
Drainage Area# 1 of 1
PROPOSED SIPS a STRUCTURAL RUNOFF VOLUME CONTROLS
Enter only runoff volume below that will be infiltrated or drawn down over 2 to 6 days. Additional volume provided In devices should not be entered in this worksheet.
Drawdown time requirement applies to all storm events.
Off6ite Impervious
L Area Treated
STORMWATER CONTROL MEASURFS
Conbibuflq Am Dralnage Total Post
Ira ervlous Pervious %of Total %of Total Storage 'Doom- Area Udlow inflow hdOtrationa Filtration Treated %of SCM
scm W1 1 411 Impervious Pervious Volume stream SCM Volume Volume ET MOM OUWow Volume
# Name I Location _ T eMOevlee NSG 105,MO 1 24,662 Area Area ("I M (of) cell (cf) (otl let) Utilized
700 �, Open Sand Fimr a 105,840 24,682 100% r00% 22841 10428 10428 497 1490 8441 43%
105840dimp-muserea entered 24662sfopenapacoantered 100%00e/ }alai
wmparadb 105840droterfntoervlous. wmparoedlo 2166a drove/ imps Boos P.M.
pen specs. am..
Design Storm RunadFFate Summary:
Rainfall Volume= ale aere-inehes= 15,225 d
Runoff Reduction Components:
Natural Infiltration&ET= -1.32 acre-MMee - -4,796 d
Disconnected Impervious Area= 0.00 time-inches = 0 d
SCM Infilbetlon= 414 acre-rnches = -497 d
Permeable Pavement Infiltration= 0.00 a-4-hea- 0 It
Green Roof ET= 0.00 sere-inehee = 0 d
Post Filtration Dlsch�rrle= -0.41 acre-indrea= -1,490 __ d
Total Runoff Reduction= d.87 acre4nches -6,784 d
SCM Treatment
Treated SCM Outflow= -2.33 auednehes = -8,441 cf
Untreated Surface Runoff= 0.00 acm4nche6 U d
Pre-Development Runoff= 0.25 s ,rohea = 908 c' J
Difference= -0.25 ecre-fnchrm= -908 cf
-BASIC TREATMENT MEP`
The Post-0avdopment gryect area contains ios&4a d or bulk upon area,resuldng In an overall densityof a1.1%.
warnings:
Nora:Large smmge devt a such ee—tfdry de-11.n ponds,consbudad—&Ma,of inNtrati-basins mey require pond muting calculations.The routing calculations should be provided In addition to ti4s spreadsheet
STORM-EZ Stpmlwatar Controls 1212 3 20 2 2
Ud,1.4 Page 9 of 13

Reh Flex Space
fo Waxhawaw,NC NC UNION County
k�L - Catawba River Basin MC VENR
Drainage Area# t of t
FATE OF RAINFALL T
Select Storm: IP90
BASIC TREATMENT SCALE
Compliance Storm=P90 Storm-Rainfall Depth=1.4 inches
{
Basic Treatment Threshold
VOLUME MATCHING SCALE
80 Storm-Rainfall Depth=1.4 inches
Volume Matching Threshold
FATE OF RAINFALL GRAPHS
Pre Development Fates Post Development Fates
10096 — — 10096 —
I
90% 90% -
eow aow —
I
70% law
00% a sow
50% � 5096
xaosc � cross
30%
20w 20%
0% 0%
Infilt,.Wnand ET-V1aUd Treated0umowfram8MPs-0ct Umreated5urface Runoff-90ad Infilostiosand ET-5295d Treeted0udl.WfM,BMh-W1d UMre MSarf—Runoff-0d
aI�Rli eetlmmtl En-rNl)d •Grem MM[wpotrempintlm-.d •Mnaetlonmtl 1,4791d •GremeoUF lYepevelapeedon-od
YOismnnedM MpeMma Nflltreflm-Od •Permeable Parenrn[Inerraeon-.tl Yercan dMperylouslnflltntion-0d Pemeable Paemm[bdlltrrti.n-Od
InNtraUon hyeMPa-pel Yplrtr •Mlltradonby--497d Yadcr
�talVatlon Gutlbw-ed Pmt Fltraemn0u[flw-149Pd
The'Fate of Raider charts display the hydrologic processes to v N h remfal volumes ere subjected based on the combinadons of land use,col type,and stumwater controls erdered by the user.The charts ere designed to display the stmmwater
plan In a toss Won llustrates changes to the hydrologic cycle which result from urbanbatcn and venous storrmveter management strategies.
STORK EZ 17/232022
Version 1 A Relnfel Fat.Graph Page 10 of 13

r
Rehobeth Flex Space ���
c Waxhaw,NC UNION County
Catawba River Basin CN QENR
Drainage Area# 1 of 1
ADDITIONAL CALCULATIONS
TIME OF CONCENTRATION CALCULATIONS:
Pre-Develofinent
Length(ft) Slope(ftfft) Surface Cover Tt(hrs)
Sheet Flow: as 0.00985 Grass 0.27
Sheet Flow:
Shallow Flow: 230 0.03217 Unpaved 0.02
Shallow Flow:
ow rea
Length(ft) Slope(ft/ft) n-value W) Wetted Perimeter (ft) Tt(hrs)
Channel Flow:
Channel Flow:
Pre-development Tc= 17.37 min (Minimum 5 minutes)
Post Develorment
Length(ft) I Slope(fdft) Surface Cover T,(hrs)
Sheet Flow:
Sheet Flow:
Shallow Flow:
Shallow Flow:
Length(ft) Slope(ft/ft) n-value (ft') Wetted Perimeter (ft) Tt(hrs)
Channel Flow:
Channel Flow:
Post-)evelopment T.= 5.00 min (Minimum 5 minutes)
ADJUSTED CURVE NUMBER CALCULATIONS:
Analysis Area=3 Acres(0.005 sq.miles)
Pre-Development_
P90 P95 1-Yr 2-Yr 10-Yr 25-Yr 50- r 100- r
Rainfall(in = 1.00 1.40 1.86 1 2.95 1 3.56 1 5.21 1 6.24 1 7.08 1 7.97
Q*,;,,= 1 0.06 1 0.08 0.14 1 0.43 0.68 1 1.55 1 2.20 1 2.78 1 3.42
CNe 1 78 1 72 67 64 63 62 61 61 61
Post Development
F.F. I P90 P95 1-Yr 2-Yr 10-Yr 25-Yr 50-Yr 100-Yr
Rainfall{in J. 1.00 1.40 1.86 2.95 3.56 5.21 6.24 7.09 7.97
Q*, = 0.00 0.00 0.00 0.06 0.61 2.11 3.07 3.87 4.71
CNedj= 67 1 59 52 49 61 69 71 72 72
PEAK FLOW CALCULATIONS:
Analysis Area=3 Acres(0.005 sq.miles)
f.€. ?a0 Vag 1-YT 2-Yr 19-Yr 2b-Yf SO-Yr 1100-Yr
Pre-Development
Q*(in) 0.06 0.08 0.14 0.43 0.68 1.55 2.20 2.78 3.42
qr(csmAn) 239.02 239.02 1 239.02 364.19 475.28 475.28 475.28 576.35 1 576.35
0(cfs) 1 0.06 0.09 1 0.15 0.74 1.51 3.44 4.89 7.50 1 9.22
Post Development
Q*(in) 0.00 0.00 0.00 0.06 0.61 2.11 3.07 3.87 4.71
qr(osmfin) 385.00 385.00 385.00 385.00 809.52 1165.98 1166.98 1165.98 1165.98
Q(cfs) 0.00 D.00 0.00 0.12 2.30 11.52 16.77 21.14 25.71
i -100.0% -100.0% -100.0% 1 -83.8% 52.1% 234.8% 1 242.9% 1 181.9% 178.8%
**Note: To decrease Post-development peak flows-increase storage volume being drawdown or infiltrated or lengthen post-
development time of concentration. See LID HELP for more information.
STORM-EZ 12/23/2022
Version 1.4 Peak Flow Calcs Page 11 of 13

Operation & Maintenance Agreement
Rehobeth Flex Space
Waxhaw,NC UNION County
Prepared By: Richard L.Modlin,Richard L.Modlin,PE
Cover Page
Maintenance records shall be kept on the following BMP(s). This maintenance record shall be kept in a log in a known set location.
Any deficient BMP elements noted in the inspection will be corrected,repaired,or replaced immediately. These deficiencies can
affect the integrity of structures,safety of the public,and the pollutant removal efficiency of the BMP(s).
The BMP(s)on this project include(check all that apply&corresponding O&M tables will be added automatically):
Bioretention Cell Quantity: Location(s):
Dry Detention Basin Quantity: Location(s):
Grassed Swale Quantity: Location(s):
Green Roof Quantity: Location(s):
Infiltration Basin Quantity: Location(s):
Infiltration Trench Quantity: Location(s):
Level SpreaderNFS Quantity: Location(s):
Permeable Pavement Quantity: Location(s):
Proprietary System Quantity: Location(s):
Rainwater Harvesting Quantity: Location(s):
Sand Filter Quantity: 1 Location(s):
Stormwater Wetland Quantity: Location(s):
Wet Detention Basin Quantity: Location(s):
Disconnected Impervious Area Present: No Location(s):
Soil Amendments Present: No Location(s):
I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed for
each BMP above,and attached O&M tables. I agree to notify NCDENR of any problems with the system or prior to any changes to
the system or responsible party.
"Responsible Party: Michael E.Anspach
Title&Organization: Manager,Rehobeth Business Park LLC
Street address: 1306 Waynewood Drive
City,state,zip: Waxhaw,NC 28173
Phone number(s): O 843-588-5107 M 704-575-6910
Email: [e-mail]
Signature: Date:
I, C r cz. @e— a Notary Public for the State of
County of U r-] U.1 do hearby certify that �{r C/t rfe 4d i,,,n ri A r7 5t7cr C
personally appeared before me this /- day of ���3�f���}t'� ZV and
acknowledge the due execution of the Operations and Maintenance Agreement,
Witness my hand and official seal,
=Plic
R
Caro]2024
y Jun 6
Sea! My commission expires r (�
STORM-EZ
12/13/2022
Version 1.4 O&M Manual Page 11 of 12

Sand Filter Maintenance Requirements
Important maintenance procedures:
- The drainage area will be carefully managed to reduce the sediment load to the sand filter.
- The sedimentation chamber or forebay will be cleaned out whenever sediment depth exceeds six inches.
- Once a year, sand media will be skimmed.
- The sand filter media will be replaced whenever it fails to function properly after maintenance.
The sand filter shall be inspected quarterly and within 24 hours after every storm event greater than 1.0 inches (or 1.5
inches if in a Coastal County). Records of operation and maintenance will be kept in a known set location and will be available
upon request.
Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately.
BMP element: Potential problem: How to remediate the problem:
Entire BMP Trash/debris is present. Remove the trash/debris.
Adjacent pavement(if Sediment is present on the Sweep or vacuum the sediment as soon as possible.
applicable) pavement surface.
Perimeter of sand filter Areas of bare soil and/or Regrade the soil if necessary to remove the gully, and then plant a
erosive gullies have formed. ground cover and water until it is established. Provide lime and a one-
time fertilizer application.
Vegetation is too short or too Maintain vegetation at an appropriate height.
long.
Flow diversion structure The structure is clogged. Unclog the conveyance and dispose of any sediment offsite.
The structure is damaged. Make any necessary repairs or replace if damage is too large for
repair.
The inlet device The pipe is clogged. Unclog the pipe. Dispose of the sediment off-site.
The pipe is cracked or Replace the pipe.
otherwise damaged.
Erosion is occurring in the Regrade the swale if necessary to smooth it over and provide erosion
swale. control devices such as reinforced turf matting or riprap to avoid future
problems with erosion.
Stone verge is clogged or Remove sediment and replace with clean stone.
covered in sediment(if
applicable).
Forebay or pretreatment Sediment has accumulated to Search for the source of the sediment and remedy the problem if
area a depth of greater than six possible. Remove the sediment and stabilize or dispose of it in a
inches. location where it will not cause impacts to streams or the BMP.
Erosion has occurred. Provide additional erosion protection such as reinforced turf matting or
riprap if needed to prevent future erosion problems.
Weeds are present. Remove the weeds, preferably by hand. If a pesticide is used,wipe itf
on the plants rather than spraying.
Filter bed and underdrain Water is ponding on the Check to see if the collector system is clogged and flush if necessary.
collection system surface for more than 24 If water still ponds, remove the top few inches of filter bed media and
hours after a storm. replace. If water still ponds, then consult an expert.
The outlet device Clogging has occurred. Clean out the outlet device. Dispose of the sediment off-site.
The outlet device is damaged Repair or replace the outlet device.
The receiving water Erosion or other signs of Contact the local NC Department of Environment and Natural
damage have occurred at the Resources Regional Office.
outlet.
STORM-EZ 12/23/2022
Version 1.4 O&M Manual Page 13 of 13