NCS000304_Gerdau Monitoring Cover Letter and Report_20140411

Charlotte -Mecklenburg
STORM 700 North Tryon Street
WATER Charlotte, NC 28202
Fax: [phone]
Services
April 11 2014
Ron Holman, Health &Safety Manager
Gerdau Ameristeel-Charlotte Steel Mill
6601 Lakeview Road
Charlotte, NC 28269
Subject: Stormwater Monitoring
Gerdau Ameristeel-Charlotte Steel Mill
Dear Mr. Holman:
On February 19, 2014, Jeff Mitchell of Charlotte-Mecklenbtrrg Storm Water Services
(CMSWS) sampled stormwater runoff from the subject facility located at 6601 Lakeview
Road, Charlotte, North Carolina. The monitoring was conducted under authority granted
by Charlotte City Code Chapter 18, Section 18-82.
The monitoring was. also conducted as part of a cooperative working agreement between.
Mecklenburg County and the North Carolina Department of Environment and Natural
Resources (NCDENR) — Division of Energy, Mineral and Land Resources (DEMLR).
NCDENR — DEMLR has been copied on this report and made aware of monitoring
results regarding the facility's NPDES permit.
At the time the Stormwater sample was collected, approximately 0.61 inches of rain had
fallen. Rainfall data was reported by the United States Geologic Survey (USGS) real-
time station CRN02. CMSWS sampled stormwater runoff from outfall DSN003.
A summary table of results is attached to this report
. Monitoring results were compared
to NPDES permit benchmark values and to local and state stream standards (CMSWS
Action Levels and North Carolina Water Quality Standards). Since the stormwater
sample was not collected from the stream, the stream standards do not necessarily apply;
however, these standards can be used to indicate the potential of polluted runoff from the
facility to impact the receiving stream.
The results indicate an
elevated concentration of pH, copper and zinc compared to the
benchmark values contained in NPDES permit NCS000304. CMSWS recommends that
you consistently implement good housekeeping, pollution prevention, and preventative
maintenance measures in order to minimize contamination in your site's stormwater
runoff.
•
To report pollution or drainage problems call: 311
CHARLOTTEhttp://stormwater.charmeck.org

Mr. Holman
Page 2
April 11, 2014
Please contact me at [phone] if you have any questions or need additional
information. For questions specifically regarding your NPDES stormwater permit, please
contact Donna Hood with NCDENR — DEMLR at [phone].
Sincerely,
Jeff Mitchell
Environmental Specialist
Charlotte -Mecklenburg Storm Water Services
Attachment
cc; Craig Miller, City of Charlotte
Donna Hood, NCDENR — DEMLR
2

Charlotte -Mecklenburg
STORM
WATER
Services
700 North Tryon Street
Charlotte, NC 28202
Fax: [phone]
Summary of Storm Water Analytical Results
Facility: Gerdau
Sample Date: 2/19/2014
Rain Event Total: 0.62
Parameter
Outfall: DSNO03
NPDES
NCS000304
Benchmark Values
CMSWS Action
Level / 1 W ater
Quality Standard
(Insteam)
E: 515717.92
NAD83 Coordinates
N: 3911061.38
NA
NA
Zone: 17
Total Flow (MG)
0.18856
NA
NA
Temperature (°C)
8.8
NA
32
Dissolved Oxygen (mg/L)
*
NA
4.0
Conductivity (umbo/cm)
364
NA
550
Pg
9.2
6-9
6-9
Fecal Coliform (cfu/100 mL)
e100
NA
3000/200
E -Coli Bacteria (mpn/100 mL)
<100
NA
NA
Enterococcus Bacteria (mpn/100 mL)
<I00
NA
NA
Ammonia Nitrogen (mg/L)
<0.10
NA
1.0
Nitrate + Nitrite mg(L)
<0.05
NA
NA
Total Kjeldahl Nitrogen (mg/L)
0.41
NA
1.5
Total Phosphorus (mg/L)
0.056
NA
0.10
Suspended Solids (mg/L)
14
100
NA
USGS Suspended Sediment Test (mg/L)
12
NA
NA
Turbidity TU)
14
NA
50.0
r (I<P�)
C[Aluminum
10
7
7.0
µg/1.)
68
67
50.0
ium (µg/L)
17
1000
50.0
g/L)
5.0
30
25.0
ry (µg/L)
<0.2
NA
0.012
(µg/L)
240
750
NA
um (µg/L)
<L0
1000
2.0
( g/L)
2.7
260
88
Oil and Grease (mg/L)
<5.0
30
NA
BOD (mg/L)
2.7
30
6.0
COD (mg/L)
20
120
1 NA
Bold indicateslevel exceeds CMSWS Action
Level, NC Water Quality
Standard (Instream)
and/or NPDES
Permit Benchmark Value
mg/L = milligrams per liter pgj
= micrograms/liter
* = DO did not check
in within range
�� To report pollution or drainage problems, call: 311 O
"=' http://stormwater.charmeck.org y
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