NCG030486_DMR_20210316

Semi-annual Stormwater Discharge Monitoring Report
for North Carolina Division of Water Quality General Permit No. NCG030000
Date submitted ?. 1��
CERTIFICATE OF COVERAGE NO. NCG030486
FACILITY NAME A.O. Smith Water Systems
COUNTY Mecklenburg
PERSON COLLECTING SAMPLES Ryan Habersang, Arcadis
LABORATORY Pace Analytical Services Inc.
Lab Cert. # 40, 37712 & 12, 37706
Comments on sample collection or analysis:
Part A: Stormwater Benchmarks and Monitoring Results
SAMPLE COLLECTION YEAR 2021
SAMPLE PERIOD ❑x Jan -June ❑ July -Dec
or ❑ Monthly' (month)
DISCHARGING TO CLASS ❑ORW ❑HQW ❑Trout ❑PNA
RECEIVED ❑Zero -flow ❑Water Supply ESA
MAR 2 7 2021 x❑other Class C
CENTRAL FILES PLEASE REMEMBER TO SIGN ON PAGES 2 AND/OR 3
DWR SECTION
❑ No discharge this period?z
Outfall No.
Date Sample
Collected'
(mo/dd/yr)
24-hour rainfall
amount,
Inches3
Total Suspended Solids
pH,
Standard units
Copper
Lead
Zinc
Non -Polar O&G/Total
Total Petroleum
Hydrocarbons
Toxic
Organics'
Benchmarks ===>
-
-
100 mg/L or 50 mg/L4
6.0 — 9.0
0.007 mg/L
0.030 mg/L
0.067 mg/L
15 mg/L
1 mg/L
SDO-002
02/11/21
0.52
53.4 mg/L
7.9 (field)
0.011 mg/I
< 0.005 mg/L
0.111 mg/L
< 5.0 mg/L
N/A
SDO-003
02/11/21
0.52
25.2 mg/L
7.7 (field)
< 0.005 mg/L
< 0.005 mg/L
0.102 mg/L
< 5.0 mg/L
N/A
' Monthly sampling (instead of semi-annual) must begin with the second consecutive benchmark exceedance for the same parameter at the same outfall.
Z For sampling periods with no discharge at any single outfall, you must still submit this discharge monitoring report with a checkmark here.
3The total precipitation must be recorded using data from an on -site rain gauge. Unattended sites may be eligible for a waiver of the rain gauge requirement.
4 See General Permit, Table 3 identifying the especially sensitive receiving water classifications where the more protective benchmark applies.
' Total Toxic Organics sampling is applicable only for those facilities which perform metal finishing operations, manufacture semiconductors, manufacture
electronic crystals, or manufacture cathode ray tubes. For purposes of this permit the definition of Total Toxic Organics is that definition contained in the EPA
Effluent Guidelines for the facility subject to the requirement to sample (for metal finishing use the definition as found in 40 CFR 433.11; for semiconductor
manufacture use the definition as found in 40 CFR 469.12; for electronic crystal manufacture use the definition as found in 40 CFR 469.22; and for cathode ray
tube manufacture use the definition found in 40 CFR 469.31).
Permit Date:11/1/2012-10/31/2017 SWU-245, last revised 10/25/2012
Page 1 of 3

Facilities that incorporate a solvent management plan into the Stormwater Pollution Prevention Plan may so certify, and the requirement for TTO monitoring
may be waived. The solvent management plan shall include a list of the total toxic organic compounds used and the other elements listed in the General
Permit. For those facilities electing to employ the TTO monitoring waiver, the discharger shall sign the following certification statement:
"Based upon my inquiry of the person or persons directly responsible for managing compliance with the permit monitoring requirement for total toxic organics
(TTO), I certify that to the best of my knowledge and belief, no dumping of concentrated toxic organics into the stormwater or areas which are exposed to rainfall or
stormwater runoff has occurred since filing the last discharge monitoring report. I further certify that this facility is implementing all the provisions of the solvent
management plan included in the Stormwater Pollution Prevention Plan."
Name (Print name)
Title (Pri B
(Signature) \ (bate)
Note: Results must be reported in numerical format. Do not report Below Detection Limit, BDL, <PQL, Non -detect, ND, or other similar non -numerical
format. When results are below the applicable limits, they must be reported in the format. "<XXthey must be reported in the format. "<XX mg/L"/L", where XX is the numerical value of the detection
limit, reporting limit, etc. in mg/L.
Note: If you report a sample value in excess of the benchmark, you must implement Tier 1, Tier 2, or Tier 3 responses. See General Permit text.
Part B: Vehicle Maintenance Area Monitoring Results: only for facilities averaging > 55 gal of new oil per month.
❑ No discharge this period?2
outfall No.
Date Sample
Collected'
(mo/dd/yr)
24-hour rainfall
amount,
Inches;
Non -polar O&G/TPH by
EPA 2664 (SGT-HEM)
Total Suspended Solids
pH
Benchmarks ===>
15 mg/L
100 mg/L or 50 mg/L'
6.0 — 9.0 SU
N/A
N/A
N/A
N/A
N/A
N/A
Footnotes from Part A also apply to this Part B
' See General Permit text, Table 5, identifying the especially sensitive receiving water classifications where the more protective benchmark applies.
Permit Date: 11/1/2012-10/31/2017 SWU-245, last revised 10/25/2012
Page 2 of 3

Note: If you report a sample value in excess of the benchmark, you must implement Tier 1, Tier 2, or Tier 3 responses. See General Permit text.
FOR PART AAND PART B MONITORING RESULTS:
• A BENCHMARK EXCEEDANCE TRIGGERS TIER 1 REQUIREMENTS. SEE PERMIT PART 11 SECTION B.
• 2 EXCEEDANCES IN A ROW FOR THE SAME PARAMETER AT THE SAME OUTFALL TRIGGER TIER 2 REQUIREMENTS. SEE PERMIT PART II SECTION B.
• TIER 3: HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES FOR THE SAME PARAMETER AT ANY ONE OUTFALL? YES ❑ NO ❑
IF YES, HAVE YOU CONTACTED THE DWQ REGIONAL OFFICE? YES ❑ NO ❑
REGIONAL OFFICE CONTACT NAME:
Mail an original and one copy of this DMR, including all "No Discharge" reports, within 30 days of receipt of the lab results for at end of monitoring period
in the case of "No Discharge" reports) to:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"I certify, under penalty of law, that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to
assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or
those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I
am aware that there are significant penalties for submitting false information, including the possibility of fines and imprisonment for knowing violations."
(Signature of Permittee)
1
(Date)
SWU-245, last revised 10/25/2012
Page 3 of 3
Permit Date:11/1/2012-10/31/2017

CC�DENR
Stormwater Discharge Outfall (SDO)
Qualitative Monitoring Report
Forguidance on filling out this form, please visit: http://portal.ncdenr.org/web/Ir/nodes-stormwater/
Permit No.: N/C/G/0/3/0/0/0/0/ or Certificate of Coverage No.:
FacilityName: A.O. Smith Water Systems
County: Mecklenburg Phone No. 704-575-5602
Inspector: Rvar
Date of Inspection:
Time of Inspection:
Total Event Precipitation (inches): 0.52
t
Was this a "Representative Storm Event" or "Measureable Storm Event" as defined by the permit?
(See information below.) s
® Yes ❑ No
Please verify whether Qualitative Monitoring must be performed during a "representative storm event"
or "measureable storm event' (requirements vary, depending on the permit). ,
Qualitative monitoring requirements vary. Most permits require qualitative monitoring to be
performed during a "representative storm event" or during a "measureable storm event " However,
some permits do not have this requirement. Please refer to these definitions, if applicable.
I
A "representative. storm event" is a storm event that measures greater than 0.1 inches of rainfall
and that is preceded by at lest 72 hours (3 days) in which no storm event measuring greater than
0.1 inches has occurred. A sikle storm event may contain up to 10 consecutive hours of no
precipitation.
A "measurable storm event;' is a storm event that results in an actual discharge from the
permitted site outfall. 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 local storm events during the sampling period, and the permittee
obtains anoroval from the local DWO Regional Office.
By this signature, I certify that this report is accurate and complete to the best of my knowledge:
(Signature of Permittee or Designee)
Pagel of 2
SWU-242, Last modified 7/31/2013

1. Outfall Description:
Outfall No. 002 and 003 Structure (pipe, ditch, etc.) Catch Basins
Receiving Stream: City of Charlotte sewer
Describe the industrial activities that occur within the outfall drainage area: Industrial
area includes loading activities
2. Color: Describe the color of the discharge using basic colors (red, brown, blue, etc.) and tint
(light, medium, dark) as descriptors: 002 = light brown and 003 = light brown
3. Odor: Describe any distinct odors that the discharge may have (i.e., smells strongly of oil,
weak chlorine odor, etc.): 002 and 003 = no odors
4. Clarity: Choose the number which best describes the clarity of the discharge, where 1 is
clear and 5 is very cloudy: **
1 2 3 4 5
S. Floating Solids: Choose the number which best describes the amount of floating solids in
the stormwater discharge, where 1 is no solids and 5 is the surface covered with floating
solids:
1O 2 3 4 5
6. Suspended Solids: Choose the number which best describes the amount of suspended
solids in the stormwater discharge, where 1 is no solids and 5 is extremely muddy:
1 2 3 4 5
7. Is there any foam in the stormwater discharge? Yes No
8. Is there an oil sheen in the stormwater discharge? Yes No
9. Is there evidence of erosion or deposition at the outfall? Yes No
10. Other Obvious Indicators of Stormwater Pollution:
List and describe No filter was located at Outfall #003.
Note: Low clarity, high solids, and/or the presence of foam, oil sheen, or erosion/deposition
may be indicative of pollutant exposure. These conditions warrant further investigation.
Page 2 of 2
SWU-242, Last modified 7/31/2013