NCG080984_2021 DMR_20210331

Duke University
Duke University Medical Center
Durham, North Carolina
27710
Occupational and Environmental Safety Office
Environmental Programs
March 30, 2021
NC DEQ DEMLR
Industrial Stormwater Program
3800 Barrett Drive
Raleigh NC 27609
Re: Duke University Transportation Maintenance Garage
Stormwater Tier 1 Response to Oil and Grease Sampling Value at SDO1
Stormwater Tier 2 Response to Total Suspended Solids Sampling Value at SDO2
Permit NCG 080000
Certificate of Coverage NCG 08984
Dear Reporting Section:
DUMC- 3914
Telephone [phone]
Fax [phone]
On 01/25/2021, the first 2021 semi-annual stormwater analytical sampling event was conducted at the
Duke University Transportation Maintenance Garage, in accordance with the facility's obligation for the
above referenced permit and certificate of coverage.
Analytical results were received on 02/08/2021 with all results below their respective semi-annual
benchmark values except for one Oil and Grease value (35 mg/L) for Stormwater Discharge Outfall 1
(SDO1) and one Total Suspended Solids value (110 mg/L) from Stormwater Discharge Outfall 2 (SDO2).
In response to these results, we conducted a facility stormwater management inspection on 2/19/2021 in
accordance with the requirements listed in NCG 080000.
Additional site -wide Tier 1 response actions taken are as follows:
1) A universal absorbent boom was installed at SDO1 and SDO2.
2) The site was swept free of sediment and debris.
3) Dry cleanup of oil spills was completed by applying a peat based oil absorbent, sweeping it up and
disposing of it appropriately.
4) Pressure washing of the fuel pump area was completed on 03/11/2021. All wastewater was contained
and collected before it was disposed of through the on -site oil water separator that discharges to the
public sanitary sewer system.
5) An informal third party inspection of the diesel fuel pumps and above ground storage tank was
conducted on 03/18/2021.
In addition, Tier 2 response actions taken at SDO2 are as follows:
1) Precipitation was monitored from 02/09/2021 to 03/08/2021 for a qualifying monthly sampling event.
No flow occurred. The SDO2 February — March Monthly Discharge Monitoring Report is included in
Attachment 1.'
2) A monthly sampling event was conducted at SDO2 on 03/16/2021.

Occupational and Environmental Safety Office
Environmental Programs
Page 2
3) Between 04/09/2021 and 05/08/2021 precipitation will continue to be monitored for the next monthly
sampling event at SDO2.
The dates of the above response actions are included in Attachment 2? We have also made note of the
actions start date, completion date, inspection date (with attending personnel), and date and value of the
benchmark exceedances within the SPPP.
Please feel free to contact me with any questions.
Thank you,
WJ0 '5��
Wesley Bigler, MEERM, CHMM
Duke UniversitylDuke University Health System
Safety & Health Specialist III
Occupational & Environmental Safety Office
Environmental Programs Division
0-[phone]IC-[phone]
t See Attachment 1 SDO2 February - March Monthly Stormwater Discharge Monitoring Report
2 See Attachment 2 Tier 1 and 2 Response Compliance Timeline

Occupational and Environmental Safety Office
Environmental Programs
Attachment 1
Page 3

NCDEQ Division of Energy, Mineral and Land Resources
5tormwater Discharge Monitoring Report (DMR) Form for NCG080000
Transit and Transportation
Click here for instructions
Complete, sign, scan and submit the DM via the 5tormwater NPDES Permit Data Monitoring Report (DMR) Upload form within
30 days of receiving sampling results. Mail the original, signed hard copy of the DMR to the appropriate DEMLR Regional Office.
Certificate of Coverage No. NCGO8 984
Person Collecting Samples: Charlotte Dawn
Facility Name: Duke University - Transportation Maintenance Garage
Laboratory Name: N/A
Facility County: Durham
Laboratory Cert. No.: N/A
Discharge during this period: ❑ Yes 0 No (if no, skip to signature and dote)
Has your facility implemented mandatoryTier response actions this sample period for any benchmark exceedances? ❑J Yes ❑ No
If so, which Tier (I, Il, or Ill)? Tier 11 at SD02'
opy of this DMR has been uploaded electronically via htt s: edocs.de .nc. ov Farms SW-DMR ElYes ❑ No
Fcte Uploaded:
Part A: Vehicle & Equipment Maintenance Areas - Benchmarks in (Red)
Parameter
Code
Parameter
Outfall
outfall
Outfall
Outfall
Outfall
N/A
Receiving Stream Class
N/A
Date Sample Collected MM/DD/YYYY
46529
24-Hour Rainfall in inches
C0530
TSS in mg/L (100 or 50`)
00552
Non -Polar Oil & Grease in mg/L (15)
00400
pH in standard units (6.0 - 9.0)
NCOIL
Estimated New Motor/Hydraulic Oil
Usage in gallmonth
Part B: Oil/Water Separators and Secondary Containments Areas at Bulk Stations & Terminals -Benchmarks in -t
Parameter
Code
Parameter
Outfall
Outfall
Outfall
Outfall
Outfall
N/A
Receiving Stream Class
N/A
Date Sample Collected MM/DD/YYYY
46529
24-Hour Rainfall in inches
C0530
TSS in mg/L (100 or 50')
00552
Non -Polar Oil & Grease in mg/L (15)
00400
pH in standard units (6.0 - 9.0)
■ Outfalls to Outstanding Resource Waters (ORW), High Quality Waters (HQW), Trout Waters (Tr) and Primary Nursery Areas (PNA)
have a benchmark T55 limit of 50 mg/L. All other water classifications have a benchmark of i.of) rn�;/r
Notes (optional): 'Tier II is being implemented at SD02 for TSS & Tier I is being implemented at S D 0 1 for Oil & Grease.
"I certify by my signature below, 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."
p"an-x�yw.a sii.g.{vn0.aoa�cu �"�a.�n unirmh>�h
March 17, 2021
Signature of Permittee or Delegated Authorized Individual Date
Email Address [e-mail] Phone Number 919-684-2794

Occupational and Environmental Safety Office
Environmental Programs
Attachment 2
Page 4

Duke University Transportation Maintenance Garage Stormwater Analytical Exceedence Response
Parameter Exceedance/ Location
TSS SD02
O&G SDO1
Date Sampled
1/25/2021
1/25/2021
Date Results Received
2/8/2021
2/8/2021
TIER 1 - If: The first valid sampling results are above
a benchmark value, or outside of the benchmark
range, for any parameter at any outfall;
1) Conduct a stormwater management inspection of the
2/19/2021
2/19/2021
facility within two weeks of receiving sampling results.
2) Identify and evaluate possible causes of the
2/19/2021
2/19/2021
benchmark value exceedance.
3) Identify potential, and select the specific feasible:
source controls, operational controls, or physical
2/19/2021
2/19/2021
improvements to reduce concentrations of the
parameters of concern, and/or to bring concentrations
4) Implement the selected feasible actions within two
2/24/2021 Boom installation;
2/24/2021 Boom installation;
months of the inspection.
3/11/2021 Pressure washing;
3/11/2021 Pressure washing;
Ongoing dry cleanup
Ongoing dry cleanup
5) Record each instance of a Tier One response in the
SPPP. Include the date and value of the benchmark
exceedance, the inspection date, the personnel
Ongoing
Ongoing
conducting the inspection, the selected actions, and the
date the selected actions were implemented.
TIER 2 - If: The first valid sampling results from two
consecutive monitoring periods (omitting periods
with no discharge) are above the benchmark values,
or outside of the benchmark range, for any specific
parameter at a specific discharge outfall:
1 Repeat all the required actions outlined above in Tier
See above
N/A
2) Immediately institute monthly monitoring and reporting
for all parameters. The permittee shall conduct monthly
monitoring at every outfall where a sampling result
2/9/2021 - 3/9/2021 No flow;
N/A
exceeded the benchmark value for two consecutive
3/16/2021 Sampled at SDO2
samples. Monthly (analytical and qualitative) monitoring
shall continue until three consecutive sample results are
3) If no discharge occurs during the sampling period, the
permittee is required to submit a monthly monitoring
Feb - Mar DMR due 4/8/2021
N/A
report indicating "No Flow" to comply with reporting
requirements.
4 Maintain a record of the Tier Two response in the
Ongoing
N/A
5) Continue Tier Two response obligations throughout
Ongoing
N/A
the permit renewal process.