NCG030085_DMR_20200507

ENGINEERING, INC.
May 7, 2020
Mr. Sean Quarry
Daimler Trucks North America, LLC
1800 North Main Street
Mount Holly, NC 28120
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Subject: Monthly Stormwater Sampling— April 2020
NPDES General Permit No. NCG030000
Daimler Trucks of North America LLC - Mount Holly, North Carolina
Shield Project No. 1140109-06
Dear Mr. Quarry:
Shield Engineering, Inc. (Shield) successfully collected monthly stormwater samples for Stormwater Discharge
Outfalls (SDO) 4001 and #002 at the Mount Holly facility for the month of April 2020. During the April 23`d
sampling event, Shield's field measurements of pH were 6.5 and 7.7, respectively, at SDO 4001 and SDO 4002,
In addition to collection of samples, Shield performed Qualitative Monitoring at SDO #001 and 4002. During the
Qualitative Monitoring, some erosion was observed at SDO #001, caused by the overflow of stormwater alongside
the concrete pipe. This will be monitored by Shield during the next stormwater sampling. A partially completed
discharge monitoring report (DMR) is attached, as well as the analytical results and Qualitative Monitoring Report
forms. The person designated to act as the permittee by Daimler Trucks — Mount Holly facility should sign all
"Red" sections of the DMR. The signed DMR form should then be mailed to the regulatory agency Central Files.
Results from the April 23`d sampling event show an exceedance for Copper at SDO #002.
Daimler remains in Tier 3 at SDO #001 and SDO #002 for Zinc and Copper. Shield will continue to perform
monthly sampling per Tier 2 requirements until instructed to decrease sampling frequency by Daimler. Shield
greatly appreciates the opportunity to provide environmental services to Daimler Trucks, North America. If you
have any questions in reference to this document or require further information, please feel free to contact either
of the undersigned at [phone].
Respectfully,
SHI.EJ.D ENGINEERING, INC.
Magdaline Tzannis
Senior Project Manager
Melind M. reene, EIT
Senior Engineer
RobertL. Griffin, P.E.
President/CEO
ATTACHMENTS
Stormwater DMR, Qualitative Monitoring Report, Analytical Results
4301 Taggart Creek Road Telephone [phone]
Charlotte, NC 28208 www.shieldengineering.com Fax 704394,6968

DAIMLER
Sean Quarry
Sr. Environmental Engineer
Daimler Trucks
1800 North Main Street
Mount Holly, NC 28120
704.822.7034 Phone
May 14, 2020
Division of Water Quality
Attn: Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
To whom it may concern:
Please find the enclosed April Stormwater Discharge Outfall (SDO) #001 and #002 analytical
results for the Daimler Trucks NA, LLC - Mount Holly Truck Manufacturing Plant (TMP). The
stormwater samples were collected on April 23, 2020. Results from this sampling event show an
exceedance of the following parameter at or above the corresponding benchmark:
• SDO #002 (04-23-2020) - Copper - 0.012 mg/L (Benchmark 0.010 mg/L)
Daimler remains in Tier 3 at SDO #001 and SDO #002 for Zinc. Shield will continue to perform
monthly sampling per Tier 2 requirements until instructed to decrease sampling frequency by
Daimler.
Should you have any questions, please contact me at 704-822-7034 or
[e-mail].
Sincerely,
Daimler Trucks NA, LLC
-ed, "2�
Sean Quarry
Sr. Environmental Engineer
Enclosures — Shield Engineering, Inc. Cover Letter and DTNA signed DMR forms

Semi-annual Stormwater Discharge Monitoring Report
for North Carolina Division of Water Quality General Permit No. NCG030000
Date submitted 5/5/2020
CERTIFICATE OF COVERAGE NO. NCG
FACILITY NAME _Daimler Trucks — Mount Holly
PERSON COLLECTING SAMPLES MandyTzannis/Shield Engineering Inc.
LABORATORY: Pace Analytical Lab Cert. # 329
Comments on sample collection or analysis: Benchmark exceedance for
Copper at SDO #002 ,
MAY 2 9 2020
Part A: Stormwater Benchmarks and Monitoring Results CENTi,1AL I:lLr=S
D'VVR ,E_nTInki
SAMPLE COLLECTION YEAR 2020
SAMPLE PERIOD ❑ 1an-June ❑ July -Dec
or ® Monthly' April
DISCHARGING TO CLASS ❑ORW ❑HQW ❑Trout ❑PNA
❑Zero -flow [:]Watersupply ❑SA
®Other
PLEASE REMEMBER TO SIGN ON PAGES 2 AND/OR 3 4
❑No dischorae this Deriod?2
Outfall No.
Date Sample
Collected 1
(mo/dd/yr�
24-hour rainfall
amount,
Inches
Total Suspended Solids
pH,
Standard units
Copper
Lead
Zinc
Non -Polar O&G/
Total Petroleum
Hydrocarbons
Total Toxic
Organics
Benchmarks =__>
_
-
100 mg/L or 50 mg/L4
6.0 — 9.0
0.010 mg/L
0.075 mg/L
0.126 mg/L
15 mg/L
1 mg/L
SDO#001
4/23/2020
0.13
10
6.5
0.0048
0.00041
0.086
2.1
NA
SDO#002
4/23/2020
0.13
31
7.7
0.012
0.00084
0.080
<5.0
NA
1 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.
;The 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.
`See General Permit, Table 3 identifying the especially sensitive receiving water classifications where the more protective benchmark applies.
s 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 the all the provisions of the
solvent management plan included in the Stormwater Pollution Prevention Plan."
/!e k7u S44 Ye 7
Name (Print name)
P II
Title (Pr' itle)
(Signs a (Date)
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, "<XX mg/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?Z
Outfall No.
Date Sample
Collected'
(mo/dd/yr)
24-hour rainfall
amount,
Inches s
Non -polar O&G/TPH by
EPA 1664 (SGT-HEM)
Total Suspended Solids
pH
Benchmarks =__>
15 mg/L
100 mg/L or 50 mg/L*
6.0 — 9.0 SU
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 A AND PART B MONITORING RESULTS:
• A BENCHMARK EXCEEDANCE TRIGGERS TIER 1 REQUIREMENTS. SEE PERMIT PART II 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 ANYONE 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 lob results (or at end of monitoring period
in the case of "No Discharge" reports) ta:
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
am aware that there are significant penalties for submitting false information, including the possibility of fines and imprisonment for knowing violations."
(Signature of Permittee)
Permit Date: 11/1/2012-10/31/2017
(Date)
SWU-245, last revised 10/2S/2012
Page 3 of 3