NCG030124_Monitoring Report_21122020

December 15, 2020
NCDENR
Division of Energy, Mineral, and Land Resources
Land Quality Section
450 West Hanes Mill Rd., Suite 300
Winston-Salem, NC 27105
Attention: Sue White
Subject: Permit No. NCG030124
Stormwater Report — Outfall 003 Monthly Tier II
Dear Sue:
Wieland
Wieland Copper Products, LLC
3990 US 311 Hwy N
Pine Hall, NC 27042
Phone: [phone]
Fax: [phone]
[e-mail]
www.wielandcopper.com
Enclosed are the sampling results for the month of November 2020 for Outfall 003.
WCP is has been compliant for two consecutive months.
If you have any questions please feel free to call me at [phone].
S(7irZonmental
kIe
&Facilities Supervisor
Cc: Central Files
NC Department cf
Environmental Quality
Received
DEC 2 1 2020
Winston-Solem
Regional Office

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Quufit;-
Sturmwater Discharge Outiall (SD®)
Qualitative Monitoring Deport
Forgttidance on filling out this jornr, please visit littps://deq.ne.gov/about/divisiotis/encriry-mineral-land-resources/
npdcs-stormwatcr-gps
Permit No.: N/C/ ! I / ! / / ! or Certificate of Coverabe No.: N/C/G/0 /3 /0 / 1 !2 /4 !
Facility Name: W:eland Copper Products _ _
County: Stokes
Inspector: Clifford Cain
Date of Inspection: 11 /11 /2020
Time of Inspection: 1215
Total Event Precipitation (inches): 5.65
Phone No.
All permits require qualitative monitoring to be performed during a "measurable storm event."
A "measurable storm event" is a storm event that results in an actual discharge from the permitted site
outfali. The previous measurable storm event must have been at least 72 hours prior. The 72-hour storm
interval does not apply if the permittee is able to document that a shorter interval is representative for
i
local storm events during the sampling period, and the permittee obtains approval from the local DEMLR
Regional Office.
By this signature, I certify that this report is accurate and complete to the best of my knowledge:
(Sigilffure of Permittee or Designee)
1. Outfall Description:
Gutfall No. 003
Receiving Stream:
Structure (pipe, ditch, etc.): Ditch
Describe the industrial activities that occur within the outfall drainage area: Copper piping & fittings
_ maduction_& I adin.g deck _-._._-_--_--_--
Pagc I of 2
SNVU-242, Last modified 06/01/201 R

20 Color Describe the color of the discbarge using basic colors (red, brown, blue, mac.) and tint
(Iight 'll% dark) as descr4ftrs.. Red & Light - - -- _
S. Odor. Descnbe any distinct odors that die disclgge may have (i.e., smells of onl, weak
chimine odor, etc.): , igne
4. C9 : Choose the nwnber which best describes the clarity of the discharge, where 1 is clear
and 5 is vay cloady:
l a 3 CD 5
I Roatins Solids,. Choose the number which best desribes the amount of floating solids imm the
Mmwater dwhaRe, where l is no solids and 5 is the surfue covered with floating solids:
3 4 5
(L Suspended : Choose the number which best dacribes the amount of suspended solids in
to stannwata disc , whem b is no solids and 5 is waimely muddy:
9. is there evidence of erosion or de sidon at the outfalli 0 Yes 0 No.
A Mer Obvgeu Indicators of Sgormwaw Y ona
Note-, Low clarity, solids, and/or the presence of foam, oil sheen, or erosion/deposition may he
dlentive of pollutant exposure. These conditions warrant farther Investigation.
PW 2 of 2
F-24Z 3 OM]IM23

Stormwater Discharge Calculations
WIEEAND COPPER PRODUCTS, LLC
2020 Calendar Year
Rationale for Discharge Calculadons
The rational formula is used for the basis of the calculations. The rational formula has been
developed to calculate the rate of run-off from a rain event of a given intensity over a given area.
The formula is written:
Q=CIA
where: Q is the rate of run-off flow in cubic feet per second (CFS)
- I is the rain intensity in inches per hour
A is the land area contributing run-off to the discharge point
and: C is a run-off coefficient which ranges from 0 for a completely pervious surface
to 1.0 for a completely impervious surface.
The rational formula results from the fact that, for a completely impervious surface, a rainfall of
one inch over a period of one hour on an area of one acre will result in a run-off discharge of one
CFS. The run-off coefficient C can be thought of as a correction factor based on the percentage
of the total rainfall which will run off from a given area due to how pervious or impervious the
surface of that area is. Since the discharge permit for this facility requires an estimate of the total
discharge from the storm event during which samples are collected, we will use a modified form
of the rational formula to calculate the total discharge as follows:
Qt = CRA (0.027)
where: Qt is the total discharge in Million Gallons
C is the run-off coefficient as defined above
It is the total amount of rainfall in inches
A is the surface area contributing flow to the sample location in acres
and: The constant 0.027 in the modified equation corrects the units to Million Gallons
(MG) based on the fact that 1 acre -inch = 0.027 MG
For drainage areas which are comprised of a combination of pervious and impervious areas, the
formula can be written as follows:
Qt = [C e A, + C2A21 (R) (0.027)
where: C 1= C factor for pervious areas
Ai = pervious area contributing to the outfall in acres
C2 = C factor for impervious areas
A2 = impervious area contributing to the outfall in acres

Discha a Calculations
`ne total rainfall for the November 11, 2020 storm during which samples were collected at this
facility was 5.65 inches. We will use generally accepted conservative estimates of the nm-off
coefficient of C=1.71 for impervious areas, and C= 0.50 for pervious areas.
The drainage areas contributing to each of the five outfalls as follows:
Outfall
Total Area (acres)
Pervious Area (acres)
@ C=0.50
Impervious Area
(acres) @ C=0.90
003
5.26
2.63 (50%)
2.63 (50°/®)
Total Discharge at Stormwater Discharge ®utfa11003
Qt = [(0.50)(8.05) + (0.90)(3.45)] (5.65) (0.027)
Qt =1.09 MG
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