NCS000064 DMR May 2017

Certified Mail 7015 1660 00010635 4469
Return to PEM Carter
PEMC17:10
April 24, 2017
NCDEQ
Division of Water Quality
Surface Water Protection Section
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
ATTN: Central Files
Celanese
The chemistry inside innovation
RECEIVED
I AY G 12017
DENR-LAND QUALITY
STORMWATER PERMITTING
Celanese Corporation
2525 Blacksburg Road
Grover, NC 28073-9641
www.celanese.com
Reference: Semi -Annual Monitoring Results — CNA Holdings, Inc- Shelby Plant -
Stormwater Permit No. NCS 000064
To Whom It May Concern:
In accordance with the facility's Stormwater NPDES Permit, semi-annual monitoring must be conducted in
accordance with permit no. NCS000064. The following represent the semi-annual monitoring results from the
sampling period of April 1—June 30, 2017. Duplicate copies of the signed DMR report are attached.
The monitoring results have been compared to the benchmark values of Table 3, which are not permit limits but
are guidelines for us to use in evaluating the sources of any benchmark exceedance and for the evaluation of the
effectiveness of our BMPs. One parameter of the North Outfall (TSS) appears to have had a significant amount
of suspended red clay which can elevate the TSS. A rain event delivered 1 inch within a short period of time
which created a "sheeting" action and would have scoured the parking lot, removing residual oil/grease resulting
in an increase in COD and BOD5.
Outfall
TSS: 100 mg/I
BOD5: 30 mg/I
COD: 120 mg/I
pH: 6-9
North Outfall
138.8
28
100
6.8
South Outfall
21.2
9.5
BRL
6.7
East Outfall
99.2
40
120
7.4
CNA Holding LLC — Shelby Plant is committed to ensuring compliance with all County, State, and Federal
regulations. Should there be a need for further discussion pertaining to the information above, feel free to call
me at 704/480-5726 or via email at pem.carterCa)celanese.com.
ySincerely,
PEM Carter
EHS Lead/Environmental Engineer
Attachments: Stormwater Discharge Outfall (SDO) Monitoring Report (2 copies)

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