NCG020931_Whitley Borrow Pit NOI Application_20180524

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Division of Energy, Mineral and Land Resources /
Land Quality Section — Stormwater Permitting Program
National Pollutant Discharge Elimination System
NCG020000
NOTICE OF INTENT — General Permit Application
FO
Date Received
Year
Month
Day
Certificate of Coverage
N
Check # Amount
Permit Assigned to
R AGENCY LY
RLCEIVEC
MAY 2 12018
National Pollutant Discharge Elimination System application for coverage under General
NCG020000: STORMWA &R ERAIT
TING
STORMWATER AND/OR WASTEWATER DISCHARGES associated with activities classified as:
SIC (Standard Industrial Classification) Code -14XX Mineral Mining Industry (except as specified below) and
like activities
The following activities are included:
• Active or inactive mining operations (including borrow pits—except for NCDOT borrow pits) that discharge
stormwater contaminated with or that has come in contact with, any overburden, raw material, intermediate
products, finished products, byproducts or waste products located on the site of such operations;
• Stormwater from vehicle maintenance activities (VMA) at mining operations;
• Overflow from facilities that recycle process wastewater; and/or
• Mine dewatering (wastewater)
The following activities are specifically excluded from coverage under this General Permit:
• Stormwater discharges associated with peat mining, coal mining, and metal mining;
• Stormwater discharges from mining operations which are intermixed on site with stormwater from concrete
operations;
• Stormwater discharges associated with oil and gas extraction operations; and
• Stormwater discharges associated with tourist gem mines
• NCDOT borrow pits (covered under individual permit NCS000150)
The following discharges are covered by NPDES general permit NCG520000 instead of NCG020000:
Point source discharges of stormwater and wastewater from in -stream sand mining operations (sand dredging
or dipping operations) are covered instead by NPDES General Permit NCG520000, administered by the Division
of Water Resources NPDES Wastewater Permitting Program. Please contact DWR for more information.
Please print or type all entries in this application form.
1) Mailing address of owner/operator (official address to which all permit correspondence will be mailed►:
Legal Owner Name Jimmy Ray Whitley
(Attach the most recent Annual Report to the NC Secretary of State showing the current legal name of the corporation or entity.
Alternatively this permit can be given to an individual or government authority. This name must be the same name as appears on the
Division of Energy, Mineral, and Land Resources' Mining Permit.)
Signee's Name (as signed for in question 41. at end) Jimmy Ray Whitley
Street Address 4187 US Hwy 70 E.
City Smithfield State NC ZIP Code 27577
Telephone No. 919-524-2222 E-mail iymco .earthlink.net
Alternate Contact Name" Jimmy Ray Whitley Jr. E-mail (if different)
Alternate Contact Telephone (if different)
*Alternate contact should be affiliated with the Owner/Operator. Consultant information can be provided
in question 5.
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2) Location of facility producing discharge:
Facility Name
Whitley Borrow Pit
Facility Street Address Brogden Rd. (No street address)
Facility City
Smithfield State NC ZIP Code 27577
Facility County
Johnston
Facility Contact
Jimmy Ray Whitley
Telephone No.
919-524-2222 Fax: none
Contact E-mail
4ymcoO)earthlink.net
3) Physical Location Information:
Please provide a narrative description of how to get to the facility (use street names, state road numbers, and
distance and direction from a roadway intersection).
The site is accessed from an existing dirt/gravel road off Brogden Rd (SR1007). The access road is from the
south side of Brogden Rd, at the intersection of Brogden Rd. and Pollard Rd.
4) Facility Location Coordinates:
Latitude 35.43873 N Longitude -78.28113 W (degrees / minutes /
seconds or decimal degrees)
5) Consultant Information (if applicable):
Consultant: T. Patrick Shillinaton. P.E.
Consulting Firm: Engineering & Environmental Science Co.
Mailing Address: 3008 Anderson Dr. Suite 102
City: Raleigh
State: NC Zip Code: 27609
Phone: [phone] Fax: [phone]
E-mail: e2s ,bellsouth.net
Permits:
6) This NPDES Permit Application applies to which of the following:
(Optional)
Staple Business Card Here
X New or Proposed Facility Date operation is to begin: Summer 2018
❑ Existing Date began mining:
7) Standard Industrial Classification:
Provide the 4 digit Standard Industrial Classification Code (SIC Code) that describes the primary industrial
activity at this facility SIC Code: 1 4 4 2
8) Provide a description of the types of minerals mined at this facility: Sand and fill/borrow soil
9) Is this a PROCESSING -ONLY facility for materials mined elsewhere? X No ❑ Yes
10) Is this an inactive mine site?
X No
❑ Yes If yes, have you certified to the Stormwater Permitting Program that all portions of the site where
clearing, grading, and/or excavation activities have occurred have been stabilized?
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❑ No ❑ Yes (If yes, the site may be eligible for "Dormant Status" and reduced BMP
inspections. See the General Permit.)
11) Does this facility already have a valid Mining Permit from DEMLR's Land Quality Section?
X No If no, please indicate the status of the Mining Permit application: Mining permit application has
been submitted and is being reviewed by NCDEQ.
❑ Yes If yes, please provide the Mining Permit number: Also provide a copy of
the DEMLR Mining Permit with this NPDES application.
12) Does this facility have any other NPDES permits?
X No
❑ Yes If yes, list the permit numbers for all current NPDES permits for this facility:
13) Are you applying for a discharge permit in the same location as a previously permitted mine?
X No
❑ Yes If yes, specify permit number and mine name if known:
14) Does this facility have any Non -Discharge permits from DWR (e.g., recycle permits)?
X No
❑ Yes If yes, list the permit numbers for all current Non -Discharge permits for this facility:
15) Does total area of this mine site include ready -mixed concrete plant and/or asphalt plant areas?
X No
❑ Yes If yes, do they have separate NPDES stormwater permits? ❑ No ❑ Yes (provide permit
number(s) )
If not owned by the same company, who is the owner?
Development Activities and Buffers:
16) Will this mining operation precede development activities at this site?
X No
❑ Yes
17) Is this mine located within one of the 20 Coastal Counties, and will it add more than 10,000 ftZ of
impervious surface?
❑ Yes (to both)
❑ No, this mine site IS in one of the 20 Coastal Counties but will NOT add 10,000 ftz of impervious surface.
X No, this mine site is NOT in any of the 20 Coastal Counties.
If this site is in one of the 20 Coastal Counties, you may be required to apply for an additional State
Stormwater Permit. Check with your local Regional Office (see contact information and checklist below).
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18) Is this mine located the Neuse, Tar -Pamlico, or Catawba River Basins, or the Randleman or Jordan
Water supply Watersheds?
site
❑ No
X Yes If yes, what size stream buffers are included on site? 65 ft. You must show buffers on
plans. Also include information and plans showing diffuse flow through buffers as required.
Discharge Points, Receiving Waters & Wetlands:
19) Receiving waters:
What is the name of the body or bodies of water (creek, stream, river, lake, etc.) that the facility stormwater
and/or wastewater discharges will end up in? Unnamed tributary to Polecat Branch
To find the waterbody, please see the "MAPS" tab on httn://portal.ncdenr.org/Weblwci for a map of NC
Surface Waterbody Classifications.
Receiving water classifications) for the waters: C:NSW
If the site will discharge to a separate storm sewer system, name the operator of the separate storm sewer
system (e.g. City of Raleigh municipal storm sewer). N/A
Discharge of wastewater to receiving waters classified as WS -11 through WS -V, or SA, must be
approved by the Division of Water Resources (DWR) or Division of Marine Fisheries
(DMF). DEMLR cannot grant coverage under NCG020000 without that approval. Also be advised that
no new discharges of wastewater are permitted in receiving waters classified as WS -1 or
freshwater ORW. Wastewater discharges to saltwater ORW will not be approved under General Permit
NCG02 but may be eligible for an individual permit.
20) Will this mine site discharge wastewater or stormwater to waters classified as High Quality Waters
(HQW), Primary Nursery Areas (PNA), Trout (Tr) waters, or a class with a symbol like "+" or "@" that
denotes a special management strategy is in place?
X No
❑ Yes, PNA*
❑ Yes, HQW* ❑ Yes, includes "+" or
❑ Yes, Trout jr)
21) Will this mine site discharge wastewater or stormwater to waters classified as Shellfish (SA) waters?
X No
❑ Yes, SA*
*For questions 19-20, be advised that the NCG02 General Permit limits the discharge volume of total combined
wastewaters to 50 percent of the receiving water in -stream flow under 7Q10 conditions in HQW waters (PNA and
SA waters are considered HQW by definition). You maybe required to contact USGS to obtain a 7Q10 flow.
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22) Will this mine site discharge wastewater or stormwater to impaired waters, or to waters with an
approved "Total Maximum Daily Load" (TMDL)?
To find impaired waters, please see the "Impaired Waters" map on the "MAPS" tab on
http://i)ortal.ncden r.orq/web/wq.
To find approved TMDLs in North Carolina, please see DWR's Water Planning Section website:
hftp://portal.ncdenr.org/web/Wti/ps/mtu/tmdl/tmdls.
X No
❑ Yes, these waters are impaired for (list pollutants):
❑ Yes, these waters have a TMDL for (list pollutants):
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23) List discharge points (outfalls) that convey discharge from the mine site (both on-site and off-site) and
location coordinates. Attach additional sheets if necessary, or note that this information is specified
on the site plan. Include proposed maximum daily flow rate for each wastewater outfall.
You must show all discharge points clearly on the submitted site plan. Be advised
that NCDEQ may require you to apply for an individual permit, based on proposed
discharge rates and receiving stream conditions (low flows, impairments, etc.)
Stormwater
Stormwater Outfall No. 1
Latitude (degrees/minutes/seconds or decimal degrees): 35.439249 N
Longitude (degrees/minutes/seconds or decimal degrees): -78.280432 W
Stormwater Outfall No. 2
Latitude (degrees/minutes/seconds or decimal degrees): 35.438947 N
Longitude (degrees/minutes/seconds or decimal degrees): -78.282336 W
Stormwater Outfall No.
Latitude (degrees/minutes/seconds or decimal degrees):
N
Longitude (degrees/minutes/seconds or decimal degrees):
W
Stormwater Outfall No.
Latitude (degrees/minutes/seconds or decimal degrees):
N
Longitude (degrees/minutes/seconds or decimal degrees):
W
Stormwater Outfall No.
Latitude (degrees/minutes/seconds or decimal degrees):
N
Longitude (degrees/minutes/seconds or decimal degrees):
W
Stormwater Outfall No.
Latitude (degrees/minutes/seconds or decimal degrees):
N
Longitude (degrees/minutes/seconds or decimal degrees):
W
Mine Dewatering
Mine Dewatering (Wastewater) Outfall No.
Proposed maximum flow rate:
Latitude (degrees/minutes/seconds or decimal degrees): N
Longitude (degrees/minutes/seconds or decimal degrees): W
Mine Dewatering (Wastewater) Outfall No.
Proposed maximum flow rate:
Latitude (degrees/minutes/seconds or decimal degrees): N
Longitude (degrees/minutes/seconds or decimal degrees): W
Process Wastewater
Process Wastewater Outfall No. Wastewater Description:
Proposed maximum flow rate:
Latitude (degrees/minutes/seconds or decimal degrees): N
Longitude (degrees/minutes/seconds or decimal degrees): W
Process Wastewater Outfall No. Wastewater Description:
Proposed maximum flow rate:.
Latitude (degrees/minutes/seconds or decimal degrees): N
Longitude (degrees/minutes/seconds or decimal degrees): W
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24) Help us understand what will happen to the dewatering water at this mine site:
X N/A — this mine is not dewatering at all and will not dewater in the future.
a) Will this mine be dewatering and discharging to waters of the state? (Answer only if dewatering)
❑ No
Yes If yes, where to? El Surface Waters and/or Wetlands (on-site or off-site)
❑ Other (on-site or off-site) Describe:
b) Will this mine be dewatering but not discharging to waters of the state? (Answer only if dewatering)
❑ No
❑ Yes If yes, explain how you are dewatering, and where that water will be directed:
25) Are there wetlands or surface waters within 400' of the mine pit perimeter?
❑ No
X Yes If yes, what distance are they from the mine pit perimeter? 80 feet.
26) Will mining operations require dewatering near wetlands or other waterbodies, and will dewatering
potentially impact any wetlands or other waterbodies?
X No, dewatering will not occur near (within 400') of wetlands or other waterbodies (e.g., streams, lake, etc.)
❑ Yes, dewatering will be near wetlands or other waterbodies
Wetlands must be CLEARLY DELINEATED on the site plan. Mine dewatering activities that
have the potential to drain wetlands or otherwise impact surface water or groundwater MUST develop and
implement a Pumping Operation and Monitoring (POM) Plan that has been approved by the
Department.
For sites that may drain wetlands — approval of a POM Plan may be required prior to coverage under
this permit. The POM Plan should be submitted to the appropriate Regional Office and in all cases must be
approved prior to operation.
The plan shall include, but is not limited to: (1) Groundwater monitoring strategies to demonstrate the effect of
pumping and to establish any pumping regime necessary to reduce impacts, and (2) Detailed plans to maintain
surrounding hydrology and respective monitoring to demonstrate compliance. See checklist at the end of the
application. Contact the Regional Office for questions specific to your mine.
27) Have you been required to obtain 404/401 Certification permits?
X No
❑ Yes If yes, please briefly describe below (include information such a required mitigation, BMPs,
setbacks, and/or O&M plans for on or off-site wetlands or other pertinent information). Attach other sheets as
necessary:
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28) Have you been required to obtain a wetland delineation certified by the US Army Corps of Engineers?
X No ❑ Yes If yes, please attach to application submission.
Stormwater BMPs and Vehicle Maintenance:
29) Does this facility employ best management practices for stormwater control?
❑ No X Yes If yes, please briefly describe: Sediment basins with skimmers/outlet pipes will
be employed as erosion control/stormwater BMPs
30) Does this facility have a Stormwater Pollution Prevention Plan?
X No ❑ Yes If yes, when was it implemented?
31) Are vehicle maintenance activities (VMA) occurring or planned at this mine site?
X No ❑Yes, If yes, will VMA area runoff discharge into the wastewater treatment system(s)?
❑ No, VMA runoff will discharge separately through a stormwater outfall
❑ Yes, VMA runoff will drain back to the mine pit or other wastewater system
Wastewater Treatment Facilities:
32) Will mine dewatering occur? (Yes, we are asking about dewatering again.)
❑ No
❑ Yes If yes, will the mine discharge this water?
33) Will this facility wash mined materials?
❑ No
❑ Yes If yes, will the mine discharge this water?
34) Will discharges of process wastewater treatment systems occur (including possible recycle system
overflows)?
❑ No
❑ Yes If yes, describe what kind of systems:
35) Will this facility employ chemical additives to flocculate suspended solids?
❑ No
❑ Yes If yes, provide the name, manufacturer, and the quantity of average daily usage of the chemical
additive (if known):
Note: Please see our website for a list of evaluated polyacrylamide (PAMS) products for use in North
Carolina: http://portal.ncdenr.orq/web/Ir/construction-stormwater
36) Will any of the wastewater treatment facilities at this mine overflow only during rainfall events that
exceed the 10 -yr, 24 -hr rainfall event?
❑ Yes If yes, which treatment systems are those?
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❑ No, all wastewater treatment facilities will discharge more frequently (i.e., during smaller rain events)
37) Are wastewater treatment facilities (including recycle systems) planned in the 100 -year flood plain?
❑ No
❑ Yes
38) A Wastewater treatment alternatives review is required by 15A NCAC 2H.0105 (c)(2)
for any new or expanding water pollution control facility discharges in North Carolina. You may
attach additional sheets. List the types of wastewater this mine site will discharge:
❑ Mine Dewatering
❑ Process Wastewater (such as washing or recycle system overflows, other mining activity wastewater)
a) What wastewaters were considered for this alternatives review? ❑ Dewatering ❑ Process WW
b) Connection to a Municipal or Regional Sewer Collection System:
i) Are there existing sewer lines within a one -mile radius? ..................................... ❑ Yes ❑ No
(1) If Yes, will the wastewater treatment plant (WWTP) accept the wastewater? .... ❑ Yes ❑ No
(a) If No, please attach a letter documenting that the WWTP will not accept the wastewater.
(b) If Yes, is it feasible to connect to the WWTP? Why or why not?*
c) Closed-loop Recycle System (meets design requirements of 15A NCAC 2T.1000):
i) Are you already proposing a closed-loop recycle system (CLRS)? ......................... ❑ Yes ❑ No
(1) If Yes, for what type of wastewater at this mine site? ❑ Dewatering ❑ Process WW
(2) If No, is this option technologically feasible (possible)? Why or why not?*
(3) If No, is it otherwise feasible to build a CLRS at this site? Why or why not?*
(4) What is the feasibility of building a CLRS compared to direct surface water discharge?*,
d) Surface or Subsurface Disposal System (e.g., spray irrigation):
i) Is a surface or subsurface disposal technologically feasible (possible)? ..................... ❑ Yes ❑ No
Why or Why not?*
ii) Is a surface or subsurface disposal system otherwise feasible to implement?*............ ❑ Yes ❑ No
Why or Why not?*
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iii) What is the feasibility of employing a subsurface or surface discharge as compared to a direct
discharge to surface waters?*
e) Direct Discharge to Surface Waters: Is discharge to surface waters the most environmentally sound
alternative of all reasonably cost-effective options for the wastewaters being considered?*
❑ Yes ❑ No
f) If this review included all wastewater discharge types, would excluding some types (e.g. mine
dewatering) make any of the above non -discharge options feasible for some of the wastewaters?
❑ Yes ❑ No
* Feasibility should take into account initial and recurring costs. You may be asked to provide
further information to support your answers to these questions after the initial review.
Other:
39) Hazardous Waste:
a) Is this facility a Hazardous Waste Treatment, Storage, or Disposal Facility?
X No ❑ Yes
b) Is this facility a Small Quantity Generator (less than 1000 kg. of hazardous waste generated per month) of
hazardous waste?
X No ❑ Yes
c) Is this facility a Large Quantity Generator (1000 kg. or more of hazardous waste generated per month) of
hazardous waste?
X No ❑ Yes
d) If you answered yes to questions b. or c., please provide the following information:
Type(s) of waste:
How is material stored:
Where is material stored:
How many disposal shipments per year:
Name of transport / disposal vendor: _
Vendor address:
40) Is your facility providing appropriate secondary containment for bulk storage of liquid materials? (See
permit text for secondary containment requirements.)
X No
❑ Yes
41) Does your site have an active landfill within the mining permit boundary?
X No
❑ Yes If yes, specify type: ❑ LCID (Land Clearing and Inert Debris) ❑ Other:
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Final Checklist:
'-f This application will be returned as incomplete unless all of the following items have been included and
1 - initialed for. Please show that the following required information has been included by initialing in each
space below.
Fee of $100 made payable to NCDEQ.
Completed application and all supporting documents.
Copy of the valid approved mining permit (MP) for the facility or indication of MP application status.-6vi,%41cJ r-4c,Jmei
Copy of a county map or other general location map that shows the mining site and nearest major roads.
Copy of USGS topographic map showing the mining site and surrounding areas, or other map that clearly
shows site location in relation to nearby streams, wetlands, and other waters, etc.
.4%!-2 copies of large-scale (minimum 24" x 36") site plan with topographical lines with
all outfalls, applicable buffers and wetlands clearly delineated, receiving waters, and
100 -year flood plain line if applicable.
A% 6 A copy of your US Army Corps -approved wetland delineation if you marked "yes" to question 27 above.
P,Q A line drawing of the water flow through the facility or block flow diagram. A pictorial description of the
nature of any sources of water and any collection and treatment measures.
4L If mine site is in one of the 20 Coastal Counties:
• Applicant has checked with the appropriate regional office to verify the need for a Coastal State
Stormwater permit. Indicate the Regional Office Contact:
• Applicant has included a detailed list of impervious surface areas and percentages, sub -drainage
areas, and total drainage area.
If the mine is dewatering and near wetlands, or may otherwise impact surface waters or groundwater,
include the following and contact your local regional office about a Pumping Operation and
Monitoring (POM) Plan. An approved POM plan may be required 13dorto NCG02 issuance.
2 copies of detailed Full Size Plans (at least 24" x 36") delineating areas on the
plans and fisting acreage (including: wetlands, ditches, well -placements, pits,
borrow areas, overburden storage, stormwater controls/BMPs, vehicle
maintenance areas, settling basins, product process (such as screening,
stockpiles, waste piles), total drainage area, impervious surface percentages (if
state SW programs apply), applicable buffers, and access and/or haul roads).
Pump dewatering size and information on its specifications.
Well information (design, depths, maintenance).
Physical monitoring for the wetlands areas.
Settling pond sizing information, if applicable.
Level spreader design, if applicable.
Details about dewatering method.
Cone of influence calculations.
Description of measures to prevent erosion and flooding.
Description and information about 401/404 permits that have been obtained.
Copy of US Army Corps of Engineers wetland delineations or approved wetland delineation (if
applicable).
I have contacted my local regional office about a POM Plan.
Regional Office Contact: Date contacted:
-OR.
I will not impact any nearby wetlands, surface waters, or groundwaters by dewatering.
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Certification: North Carolina General Statute 143-215.6 b (i) provides that:
Any person who knowingly makes any false statement, representation, or certification in any application, record, report, plan, or other
document filed or required to be maintained under this Article or a rule implementing this Article; or who knowingly makes a false
statement of a material fact in a rulemaking proceeding or contested case under this Article; or who falsifies, tampers with, or knowingly
renders inaccurate any recording or monitoring device or method required to be operated or maintained under this Article or rules of the
[Environmental Management] Commission implementing this Article shall be guilty of a Class 2 misdemeanor which may include a fine not to
exceed ten thousand dollars ($10,000).
41) Signatory Requirements (per 40 CFR 122.22)
All applications, reports, or information submitted to the Director shall be signed and certified.
a. All notices of intent to be covered under this General Permit shall be signed as follows:
(1) For a corporation: by a responsible corporate officer. For the purpose of this permit, a responsible corporate officer means: (a) a president,
secretary, treasurer or vice president of the corporation in charge of a principal business function, or any other person who performs similar
policy or decision making functions for the corporation, or (b) the manager of one or more manufacturing production or operating facilities
employing more than 250 persons or having gross annual sales or expenditures exceeding 25 million (in second quarter 1980 dollars), if
authority to sign documents has been assigned or delegated to the manager in accordance with corporate procedures.
(2) For a partnership or sole proprietorship: by a general partner or the proprietor, respectively; or
(3) For a municipality, state, federal, or other public agency: by either a principal executive officer or ranking elected official.
I hereby request coverage under the referenced General Permit. I understand that coverage under this permit will
constitute the permit requirements for the discharge(s) and is enforceable in the same manner as an individual
permit.
I agree to abide by the following as a part of coverage under this General Permit:
1. 1 agree to abide by the approved Mining Permit for this mining activity. (A copy of the valid
mining permit must be attached to this request.)
2. 1 agree to not discharge any sanitary wastewater from this mining activity except under the
provisions of another NPDES permit specifically issued therefore.
3. 1 agree that bulk storage of petroleum products and other chemicals shall have adequate
protection so as to contain all spills on the site.
4. 1 agree that solid wastes will be disposed of in accordance with N.C. statutes and rules
governing solid waste disposal.
5. 1 agree that maintenance activities for vehicles and heavy equipment will be performed so as to
not result in contamination of the surface or ground waters.
I agree to abide by the provisions as listed above and recognize that the provisions are to be considered as
enforceable requirements of the General Permit.
I certify that I am familiar with the information contained in this application and that to the best of my knowledge
and belief such information is true, complete, and accurate.
Printed Name of Person Signing:
Title:
(Sig ture of App cant ( ate Signed)
Notice of Intent must be accompanied by a check or money order for $100.00 made payable to NCDEQ.
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2 ENGINEERING &MNTAL
SCIENCE COMPANY
3008 ANDERSON DR., SUITE 102
RALEIGH, NORTH CAROLINA 27609
[phone]
D rrE:
Vicinity Map
Whitley ,Borrow Pit 4/25/18
Brogden Rd. FIGURE NO
Johnston County, NC I

CIS
ENGINEERING & ENVIRONMENTAL SCIENCE COMPANY
3008 ANDERSON DRIVE, SUITE 102
RALEIGH, NG 27609
May 10, 2018 [phone]
Mr. Jimmy Ray Whitley
4187 US Hwy 70 E.
Smithfield, NC 27577
RE: Stormwater Evaluation
Whitley Borrow Pit
Brogden Road
Johnston County
Dear Mr. Whitley:
Engineering & Environmental Science Company (E2S) has completed an evaluation of
this facility for coverage under General Permit NCG020000. This permit pertains to
stormwater discharges associated with mining activities. Following is a brief discussion
of this evaluation.
The proposed Whitley Borrow is located approximately 5 miles southeast of downtown
Smithfield, NC. The site is accessed from an existing gravel road off of Brogden Road
(See Figure 1). A total of 59.8 acres is proposed within the mining permit boundary, with
16.5 acres to be affected/disturbed. An applications for a Mining Permit is being
submitted concurrently with the General Permit NCG020000.
The proposed mining operation will use front end loaders and backhoes to excavate for
fill dirt and sand. The maximum expected depth of excavation is approximately 20 ft.,
and the average depth of excavation will be approximately 10 ft.
The mine will have two (2) points of discharge. The provided Stormwater Plan (Sheet 1)
shows the locations of these discharge points and their watersheds. The discharge will be
stormwater runoff from the mine excavation area. Discharge will be minimal as mining
progresses and the basin sizes increase. Discharges will be from a 4" PVC pipe and 2.5"
skimmer system. Secondary spillways are provided for each basin to pass larger storm
events. The basins can pass the 10 -year rain event with 1 ft. of freeboard. The stormwater
routing calculations are provide in Attachment B. The receiving water is an unnamed
tributary to Polecat Branch which has a stream classifications of C;NSW.
We appreciate serving you on this project. Please contact us if you have any questions.
Sincerely,
Patrick Shillington, P. .
President
D
Attachment A: Figures
Attachment B: Calculations

r Ob
Attachment A: Figures
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2 ENGINEERING &MNTAL
SCIENCE COMPANY
3008 ANDERSON DR., SUITE 102
RALEIGH, NORTH CAROLINA 27609
[phone]
IME:
USGS Topography Map
Whitley Borrow Pit 05/10/18
Brogden Rd. FIGURE NO
Scale: 1" = 5000' Johnston County, NC 1
62s

Attachment B: Calculations
EIS

i�
Watershed
oSubcat Reach on [Link"
Basin 1 (existing)

Existing Basin 1 Type 11 24 -hr 10 yr Rainfall=5.51 "
Prepared by {enter your company name here} Printed 5/18/2018
HydroCAD®10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page 2
Summary for Subcatchment 1S: Watershed 1
[49] Hint: Tc<2dt may require smaller dt
Runoff = 26.21 cfs @ 11.96 hrs, Volume= 1.222 af, Depth= 3.06"
Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24 -hr 10 yr Rainfall=5.51"
Area (ac) CN Description
4.800 77 Fallow, bare soil, HSG A
4.800 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry, 5 minutes

> > > � -L " j
O O O O CO (fl (O CD OD OD M M -4 -4 -4 V I 0 0 0 0 t (n ui U1 A A A A W W W W N N N N�� j -� p�
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060Cn0tn0(n6616666066666066Cn666616Cn6U166C) 660Cn666 in666616 - O- �
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000000000000000000mmmm0mCA00m0m0000CA0mmm V W AODCil Cn0000 u> > C
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0000000000000a00000000000000000000000000000N00000�� O O�
00000000000000000000000000000000000000oNCaAb)�i.No000N O N�
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Existing Basin 1 Type 11 24 -hr 10 yr Rainfall=5.51 "
Prepared by {enter your company name here) Printed 5/18/2018
HydroCAD® 10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page 4
Summary for Pond 1 P: Basin 1 (existing)
Inflow Area = 4.800 ac, 0.00% Impervious, Inflow Depth = 3.06" for 10 yr event
Inflow = 26.21 cfs @ 11.96 hrs, Volume= 1.222 of
Outflow = 16.77 cfs @ 12.04 hrs, Volume= 1.222 af, Atten= 36%, Lag= 5.0 min
Primary = 16.77 cfs @ 12.04 hrs, Volume= 1.222 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 118.53'@ 12.04 hrs Surf.Area= 8,936 sf Storage= 19,789 cf
Plug -Flow detention time= 713.1 min calculated for 1.222 of (100% of inflow)
Center -of -Mass det. time= 714.3 min ( 1,535.6 - 821.3 )
Volume Invert Avail.Storage Storage Description
#1 116.00' 28,608 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq -ft) (cubic -feet) (cubic -feet)
116.00 6,400 0 0
118.00 8,580 14,980 14,980
119.50 9,590 13,628 28,608
Device Routing Invert Outlet Devices
#1 Primary 115.00' 4.0" Round Culvert
L= 50.0' CPP, projecting, no headwall, Ke= 0.900
Inlet/ Outlet Invert= 115.00'/ 114.50' S=0.0100? Cc= 0.900
n= 0.010 PVC, smooth interior, Flow Area= 0.09 sf
#2 Device 1 115.00' 0.072 cfs 2.5" skimmer
#3 Primary 118.00' Asymmetrical Weir, C= 3.27
Offset (feet) 0.00 4.50 16.50 21.00
Height (feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=16.20 cfs @ 12.04 hrs HW=118.52' (Free Discharge)
Culvert (Passes 0.07 cfs of 0.55 cfs potential flow)
2=2.5" skimmer (Constant Controls 0.07 cfs)
3=Asymmetrical Weir (Weir Controls 16.13 cfs @ 2.06 fps)

Existing Basin 1 Type// 24 -hr 10 yr Rainfall=5.51 "
Prepared by {enter your company name here} Printed 5/18/2018
HydroCAD®10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page 5
Hydrograph for Pond 1 P: Basin 1 (existing)
Time
Inflow
Storage
Elevation
Primary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
116.00
0.00
2.50
0.00
0
116.00
0.00
5.00
0.00
0
116.00
0.00
7.50
0.00
0
116.00
0.00
10.00
0.22
459
116.06
0.07
12.50
2.18
16,438
118.16
2.69
15.00
0.67
15,546
118.06
0.70
17.50
0.43
15,370
118.04
0.44
20.00
0.30
15,275
118.03
0.31
22.50
0.27
15,246
118.03
0.27
25.00
0.00
14,863
117.98
0.07
27.50
0.00
14,215
117.90
0.07
30.00
0.00
13,567
117.81
0.07
32.50
0.00
12,919
117.72
0.07
35.00
0.00
12,271
117.64
0.07
37.50
0.00
11,623
117.55
0.07
40.00
0.00
10,975
117.47
0.07
42.50
0.00
10,327
117.38
0.07
45.00
0.00
9,679
117.29
0.07
47.50
0.00
9,031
117.21
0.07
50.00
0.00
8,383
117.12
0.07
52.50
0.00
7,735
117.03
0.07
55.00
0.00
7,087
116.95
0.07
57.50
0.00
6,439
116.86
0.07
60.00
0.00
5,791
116.77
0.07
62.50
0.00
5,143
116.69
0.07
65.00
0.00
4,495
116.60
0.07
67.50
0.00
3,847
116.51
0.07
70.00
0.00
3,199
116.43
0.07
72.50
0.00
2,551
116.34
0.07
75.00
0.00
1,903
116.25
0.07
77.50
0.00
1,255
116.17
0.07
80.00
0.00
607
116.08
0.07
82.50
0.00
82
116.01
0.02
85.00
0.00
7
116.00
0.00
87.50
0.00
1
116.00
0.00
90.00
0.00
0
116.00
0.00
92.50
0.00
0
116.00
0.00
95.00
0.00
0
116.00
0.00
97.50
0.00
0
116.00
0.00
100.00
0.00
0
116.00
0.00
102.50
0.00
0
116.00
0.00
105.00
0.00
0
116.00
0.00
107.50
0.00
0
116.00
0.00
110.00
0.00
0
116.00
0.00
112.50
0.00
0
116.00
0.00
115.00
0.00
0
116.00
0.00
117.50
0.00
0
116.00
0.00
120.00
0.00
0
116.00
0.00

Existing Basin 1 Type 11 24 -hr 25 yr Rainfall=6.72"
Prepared by {enter your company name here} Printed 5/18/2018
HydroCAD®10.00-20 s/n 07329 02017 HydroCAD Software Solutions LLC Page 6
Summary for Subcatchment 1S: Watershed 1
[49] Hint: Tc<2dt may require smaller dt
Runoff = 34.93 cfs @ 11.96 hrs, Volume= 1.646 af, Depth= 4.12"
Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24 -hr 25 yr Rainfall=6.72"
Area (ac) CN Description
4.800 77 Fallow, bare soil, HSG A
4.800 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry, 5 minutes

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Existing Basin 1 Type 11 24 -hr 25 yr Rainfall=6.72"
Prepared by {enter your company name here} Printed 5/18/2018
HydroCAD®10.00-20 s/n 07329 02017 HydroCAD Software Solutions LLC Page 8
Summary for Pond 1 P: Basin 1 (existing)
Inflow Area = 4.800 ac, 0.00% Impervious, Inflow Depth = 4.12" for 25 yr event
Inflow = 34.93 cfs @ 11.96 hrs, Volume= 1.646 of
Outflow = 30.31 cfs @ 12.00 hrs, Volume= 1.646 af, Atten= 13%, Lag= 2.9 min
Primary = 30.31 cfs @ 12.00 hrs, Volume= 1.646 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 118.76'@ 12.00 hrs Surf.Area= 9,095 sf Storage= 21,925 cf
Plug -Flow detention time= 534.8 min calculated for 1.645 of (100% of inflow)
Center -of -Mass det. time= 536.1 min ( 1,348.9 - 812.8 )
Volume Invert Avail.Storage Storage Description
#1 116.00' 28,608 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq -ft) (cubic -feet) (cubic -feet)
116.00 6,400 0 0
118.00 8,580 14,980 14,980
119.50 9,590 13,628 28,608
Device Routing Invert Outlet Devices
#1 Primary 115.00' 4.0" Round Culvert
L= 50.0' CPP, projecting, no headwall, Ke= 0.900
Inlet/ Outlet Invert= 115.00'/ 114.50' S=0.0100? Cc= 0.900
n=0.010 PVC, smooth interior, Flow Area= 0.09 sf
#2 Device 1 115.00' 0.072 cfs 2.5" skimmer
#3 Primary 118.00' Asymmetrical Weir, C= 3.27
Offset (feet) 0.00 4.50 16.50 21.00
Height (feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=29.96 cfs @ 12.00 hrs HW=118.76' (Free Discharge)
Culvert (Passes 0.07 cfs of 0.57 cfs potential flow)
2=2.5" skimmer (Constant Controls 0.07 cfs)
3=Asymmetrical Weir (Weir Controls 29.89 cfs @ 2.38 fps)

Existing Basin 1 Type 11 24 -hr 25 yr Rainfall=6.72"
Prepared by {enter your company name here} Printed 5/18/2018
HydroCAD® 10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Pape 9
Hydrograph for Pond 1P: Basin 1 (existing)
Time
Inflow
Storage
Elevation
Primary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
116.00
0.00
2.50
0.00
0
116.00
0.00
5.00
0.00
0
116.00
0.00
7.50
0.05
67
116.01
0.02
10.00
0.39
1,187
116.16
0.07
12.50
2.83
16,691
118.19
3.41
15.00
0.86
15,652
118.07
0.89
17.50
0.55
15,456
118.05
0.57
20.00
0.38
15,334
118.04
0.39
22.50
0.34
15,299
118.04
0.34
25.00
0.00
14,878
117.99
0.07
27.50
0.00
14,230
117.90
0.07
30.00
0.00
13,582
117.81
0.07
32.50
0.00
12,934
117.73
0.07
35.00
0.00
12,286
117.64
0.07
37.50
0.00
11,638
117.55
0.07
40.00
0.00
10,990
117.47
0.07
42.50
0.00
10,342
117.38
0.07
45.00
0.00
9,694
117.29
0.07
47.50
0.00
9,046
117.21
0.07
50.00
0.00
8,398
117.12
0.07
52.50
0.00
7,750
117.03
0.07
55.00
0.00
7,102
116.95
0.07
57.50
0.00
6,454
116.86
0.07
60.00
0.00
5,806
116.78
0.07
62.50
0.00
5,158
116.69
0.07
65.00
0.00
4,510
116.60
0.07
67.50
0.00
3,862
116.52
0.07
70.00
0.00
3,214
116.43
0.07
72.50
0.00
2,566
116.34
0.07
75.00
0.00
1,918
116.26
0.07
77.50
0.00
1,270
116.17
0.07
80.00
0.00
622
116.08
0.07
82.50
0.00'
87
116.01
0.02
85.00
0.00
7
116.00
0.00
87.50
0.00
1
116.00
0.00
90.00
0.00
0
116.00
0.00
92.50
0.00
0
116.00
0.00
95.00
0.00
0
116.00
0.00
97.50
0.00
0
116.00
0.00
100.00
0.00
0
116.00
0.00
102.50
0.00
0
116.00
0.00
105.00
0.00
0
116.00
0.00
107.50
0.00
0
116.00
0.00
110.00
0.00
0
116.00
0.00
112.50
0.00
0
116.00
0.00
115.00
0.00
0
116.00
0.00
117.50
0.00
0
116.00
0.00
120.00
0.00
0
116.00
0.00

2S
Watershed 2 2 P
Basin #2 (Proposed)
Subcat Reach on Link

Proposed Basin #2 Type 11 24 -hr 10 yr Rainfall=5.51 "
Prepared by {enter your company name here) Printed 5/18/2018
HydroCAD®10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page 2
Summary for Subcatchment 2S: Watershed 2
Runoff = 26.33 cfs @ 12.11 hrs, Volume= 1.939 af, Depth= 1.69"
Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24 -hr 10 yr Rainfall=5.51"
Area (ac) CN Description
7.140
77 Fallow, bare soil, HSG A
6.670
43 Woods/grass comb., Fair, HSG A
13.810
61 Weighted Average
13.810
100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
7.1
100
0.0380
0.23
Sheet Flow,
Grass: Short n=0.150 P2=3.64"
3.0
657
0.0500
3.60
Shallow Concentrated Flow,
Unpaved Kv= 16.1 fps
7.2
990
0.0200
2.28
Shallow Concentrated Flow,
Unpaved Kv= 16.1 fps
17.3 1,747 Total

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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 -I Cn N O N O O O O O
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Proposed Basin #2 Type 11 24-hr 10 yr Rainfall=5.51 "
Prepared by {enter your company name here) Printed 5/18/2018
HydroCADO 10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page 4
Summary for Pond 2P: Basin #2 (Proposed)
Inflow Area = 13.810 ac, 0.00% Impervious, Inflow Depth = 1.69" for 10 yr event
Inflow = 26.33 cfs @ 12.11 hrs, Volume= 1.939 of
Outflow = 23.38 cfs @ 12.18 hrs, Volume= 1.939 af, Atten= 11 %, Lag= 4.3 min
Primary = 23.38 cfs @ 12.18 hrs, Volume= 1.939 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 113.52'@ 12.18 hrs Surf.Area= 7,258 sf Storage= 16,700 cf
Plug-Flow detention time= 351.1 min calculated for 1.938 of (100% of inflow)
Center-of-Mass det. time= 352.2 min ( 1,225.1 - 872.8 )
Volume Invert Avail.Storage Storage Description
#1 111.00' 20,210 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
111.00 5,967 0 0
112.00 6,480 6,224 6,224
113.00 6,993 6,737 12,960
114.00 7,506 7,250 20,210
Device Routing Invert Outlet Devices
#1 Primary 110.00' 4.0" Round Culvert
L= 50.0' CPP, projecting, no headwall, Ke= 0.900
Inlet/ Outlet Invert= 110.00'/ 109.50' S= 0.0100'f Cc= 0.900
n= 0.010 PVC, smooth interior, Flow Area= 0.09 sf
#2 Device 1 110.00' 0.072 cfs 2.5" skimmer
#3 Primary 113.00' Asymmetrical Weir, C= 3.27
Offset (feet) 0.00 4.50 22.50 27.00
Height (feet) 1.50 0.00 0.00 1.50
f.rimary OutFlow Max=22.87 cfs @ 12.18 hrs HW=113.51' (Free Discharge)
Culvert (Passes 0.07 cfs of 0.55 cfs potential flow)
2=2.5" skimmer (Constant Controls 0.07 cfs)
3=Asymmetrical Weir (Weir Controls 22.80 cfs @ 2.13 fps)

- I.
Proposed Basin #2 Type /l 24 -hr 10 yr Rainfall=5.51"
Prepared by {enter your company name here} Printed 5/18/2018
HydroCAD®10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page 5
Hydrograph for Pond 2P: Basin #2 (Proposed)
Time
Inflow
Storage
Elevation
Primary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
111.00
0.00
2.50
0.00
0
111.00
0.00
5.00
0.00
0
111.00
0.00
7.50
0.00
0
111.00
0.00
10.00
0.00
0
111.00
0.00
12.50
6.72
14,761
113.25
7.61
15.00
1.40
13,533
113.08
1.42
17.50
0.92
13,383
113.06
0.93
20.00
0.65
13,283
113.04
0.66
22.50
0.57
13,252
113.04
0.58
25.00
0.00
12,883
112.99
0.07
27.50
0.00
12,235
112.89
0.07
30.00
0.00
11,587
112.80
0.07
32.50
0.00
10,939
112.70
0.07
35.00
0.00
10,291
112.60
0.07
37.50
0.00
9,643
112.51
0.07
40.00
0.00
8,995
112.41
0.07
42.50
0.00
8,347
112.32
0.07
45.00
0.00
7,699
112.22
0.07
47.50
0.00
7,051
112.12
0.07
50.00
0.00
6,403
112.03
0.07
52.50
0.00
5,755
111.92
0.07
55.00
0.00
5,107
111.82
0.07
57.50
0.00
4,459
111.72
0.07
60.00
0.00
3,811
111.61
0.07
62.50
0.00
3,163
111.51
0.07
65.00
0.00
2,515
111.40
0.07
67.50
0.00
1,867
111.30
0.07
70.00
0.00
1,219
111.20
0.07
72.50
0.00
571.
111.09
0.07
75.00
0.00
56
111.01
0.02
77.50
0.00
3
111.00
0.00
80.00
0.00
0
111.00
0.00
82.50
0.00
0
111.00
0.00
85.00
0.00
0
111.00
0.00
87.50
0.00
0
111.00
0.00
90.00
0.00
0
111.00
0.00
92.50
0.00
0
111.00
0.00
95.00
0.00
0
111.00
0.00
97.50
0.00
0
111.00
0.00
100.00
0.00
0
111.00
0.00
102.50
0.00
0
111.00
0.00
105.00
0.00
0
111.00
0.00
107.50
0.00
0
111.00
0.00
110.00
0.00
0
111.00
0.00
112.50
0.00
0
111.00
0.00
115.00
0.00
0
111.00
0.00
117.50
0.00
0
111.00
0.00
120.00
0.00
0
111.00
0.00

Proposed Basin #2 Type 11 24 -hr 25 yr Rainfall=6.72"
Prepared by (enter your company name here) Printed 5/18/2018
HydroCAD® 10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page 6
Summary for Subcatchment 2S: Watershed 2
Runoff = 40.39 cfs @ 12.11 hrs, Volume= 2.879 af, Depth= 2.50"
Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24 -hr 25 yr Rainfall=6.72"
Area (ac) CN Description
7.140
77 Fallow, bare soil, HSG A
6.670
43 Woods/grass comb., Fair,
HSG A
13.810
61 Weighted Average
13.810
100.00% Pervious Area
Tc Length
Slope Velocity Capacity
Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
7.1 100
0.0380 0.23
Sheet Flow,
Grass: Short n=0.150 P2=3.64"
3.0 657
0.0500 3.60
Shallow Concentrated Flow,
Unpaved Kv= 16.1 fps
7.2 990
0.0200 2.28
Shallow Concentrated Flow,
Unpaved Kv= 16.1 fps
17.3 1,747 Total

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Proposed Basin #2 Type l/ 24 -hr 25 yr Rainfall=6.72"
Prepared by {enter your company name here} Printed 5/18/2018
HydroCAD®10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page 8
Summary for Pond 2P: Basin #2 (Proposed)
Inflow Area = 13.810 ac, 0.00% Impervious, Inflow Depth = 2.50" for 25 yr event
Inflow = 40.39 cfs @ 12.11 hrs, Volume= 2.879 of
Outflow = 39.55 cfs @ 12.13 hrs, Volume= 2.879 af, Atten= 2%, Lag= 1.6 min
Primary = 39.55 cfs @ 12.13 hrs, Volume= 2.879 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 113.72'@ 12.13 hrs Surf.Area= 7,363 sf Storage= 18,185 cf
Plug -Flow detention time= 238.3 min calculated for 2.878 of (100% of inflow)
Center -of -Mass det. time= 239.5 min ( 1,100.1 - 860.6 )
Volume Invert Avail.Storage Storage Description
#1 111.00' 20,210 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq -ft) (cubic -feet) (cubic -feet)
111.00 5,967 0 0
112.00 6,480 6,224 6,224
113.00 6,993 6,737 12,960
114.00 7,506 7,250 20,210
Device Routing Invert Outlet Devices
#1 Primary 110.00' 4.0" Round Culvert
L= 50.0' CPP, projecting, no headwall, Ke= 0.900
Inlet/ Outlet Invert= 110.00'/ 109.50' S=0.0100'/' Cc= 0.900
n=0.010 PVC, smooth interior, Flow Area= 0.09 sf
#2 Device 1 110.00' 0.072 cfs 2.5" skimmer
#3 Primary 113.00' Asymmetrical Weir, C= 3.27
Offset (feet) 0.00 4.50 22.50 27.00
Height (feet) 1.50 0.00 0.00 1.50
Primary OutFlow Max=38.96 cfs @ 12.13 hrs HW=113.71' (Free Discharge)
Culvert (Passes 0.07 cfs of 0.57 cfs potential flow)
2=2.5" skimmer (Constant Controls 0.07 cfs)
3=Asymmetrical Weir (Weir Controls 38.89 cfs @ 2.44 fps)

1 4p 0 +
Proposed Basin #2 Type 11 24 -hr 25 yr Rainfall=6.72"
Prepared by {enter your company name here} Printed 5/18/2018
HydroCAD®10.00-20 s/n 07329 © 2017 HydroCAD Software Solutions LLC Page 9
Hydrograph for Pond 2P: Basin #2 (Proposed)
Time
Inflow
Storage
Elevation
Primary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
111.00
0.00
2.50
0.00
0
111.00
0.00
5.00
0.00
0
111.00
0.00
7.50
0.00
0
111.00
0.00
10.00
0.00
0
111.00
0.00
12.50
9.70
15,235
113.31
10.86
15.00
1.94
13,686
113.10
1.96
17.50
1.26
13,491
113.07
1.27
20.00
0.88
13,372
113.06
0.90
22.50
0.78
13,329
113.05
0.78
25.00
0.00
12,894
112.99
0.07
27.50
0.00
12,246
112.89
0.07
30.00
0.00
11,598
112.80
0.07
32.50
0.00
10,950
112.70
0.07
35.00
0.00
10,302
112.61
0.07
37.50
0.00
9,654
112.51
0.07
40.00
0.00
9,006
112.41
0.07
42.50
0.00
8,358
112.32
0.07
45.00
0.00
7,710
112.22
0.07
47.50
0.00
7,062
112.12
0.07
50.00
0.00
6,414
112.03
0.07
52.50
0.00
5,766
111.93
0.07
55.00
0.00
5,118
111.82
0.07
57.50
0.00
4,470
111.72
0.07
60.00
0.00
3,822
111.61
0.07
62.50
0.00
3,174
111.51
0.07
65.00
0.00
2,526
111.41
0.07
67.50
0.00
1,878
111.30
0.07
70.00
0.00
1,230
111.20
0.07
72.50
0.00
582
111.09
0.07
75.00
0.00
59
111.01
0.02
77.50
0.00
3
111.00
0.00
80.00
0.00
0
111.00
0.00
82.50
0.00
0
111.00
0.00
85.00
0.00
0
111.00
0.00
87.50
0.00
0
111.00
0.00
90.00
0.00
0
111.00
0.00
92.50
0.00
0
111.00
0.00
95.00
0.00
0
111.00
0.00
97.50
0.00
0
111.00
0.00
100.00
0.00
0
111.00
0.00
102.50
0.00
0
111.00
0.00
105.00
0.00
0
111.00
0.00
107.50
0.00
0
111.00
0.00
110.00
0.00
0
111.00
0.00
112.50
0.00
0
111.00
0.00
115.00
0.00
0
111.00
0.00
117.50
0.00
0
111.00
0.00
120.00
0.00
0
111.00
0.00