NCS000332_Monitoring Data_20190716

NPDES Storm Water Permit Coverage Renewal
Hexion Inc.
Permit Number NCS000332
Effective February 10, 2015
Summary of Analytical Monitoring Results
Outfall 001
Monitoring Period
Sample Date
Reason for Testing
Rainfall
(inches)
COD
(mg/L)
Ammonia
(mg/L)
Formaldehyde
(mg/L)
Period 2 (April 2015 -September 2015)
9/24/2015
Semiannual
3.25
73
0.43
0.786
Period 1 (October 2015 -March 2016)
3/28/2016
Semiannual
0.5
0.55
0.131
Period 2 (April 2016 -September 2016)
9/27/2016
Semiannual
0.3
0.34
0.234
-
11/29/2016
Tier Two
1.2
25
0.39
0.0431
Period 1 (October 2016 -March 2017)
3/30/2017
Semiannual
0.2
15u
0.32
ND
Period 1 (October 2017 -March 2018)
12/20/2017
Semiannual
0.25
169
0.26
0.307
-
4/23/2018
Tier Two
3.31
46
0.21
0.22
-
5/31/2018
Tier Two
0.11
25
0.79
0.212
-
6/25/2018
Tier Two
0.4
76
0.24
0.257
-
7/31/2018
Tier Two
2.73
30.8
0.14
ND
Period 2 (April 2018 -September 2018)
8/8/2018
Semiannual
2
0.2
0.59
Period 1 (October 2018 -March 2019)
3/21/2019
Semiannual
0.16
54.9
0.83
N/A
*N/A - the formaldehyde was tested outside of the EPA specified holding time; therefore, results are invalid. Hexion will retest formaldehyde May 20.

pH
7.29
7.42
8.18
7.97
7.4
8.1
Not measured
Not measured
7.18
6.5
7.1
7.17
19 and submit a subsequent DMR.