NCG030657 DMR SW (letter)

RECEIVED
MATLAB, INC.—PLANT#14
ASHEBORO,NORTH CAROLINA DEC 1 3 1 U 16
CENTRAL FILES
TIER I PERMIT COMPLIANCE INSPECTION DWR SECTION
As required by General Stormwater Permit No. +�+ 0f06 , a compliance evaluation
was conducted on 12/7/16 in response to stormwater analytical parameter exceedence.
Present during the inspection were:
Paul Spangenberg Consultant(Environmental Compliance Manager)
Press Brower VP of Engineering
Audi Tucker Plant Manager
1) Areas where industrial activities are exposed to stormwater.
a) Used equipment. No evidence was found that an impact to stormwater has
occurred in this area.
b) Solid Waste Dumpster Area: No evidence was seen of any impacts to
stormwater in this area.
c) Compressor Area: Some minor staining was present. A separator is being ,
implemented for the condensation.
d) Equipment storage area. The area has erosion control in place however
the movement of equipment has made the erosion control in effective.
e) Loading Dock Area: The area was clean with no staining. No evidence
was seen of any impacts to stormwater in this area.
Summary: With the exception of some oil leakage from the yard crane,the
following were not found during the inspection:
a) leaks or spills from equipment, drums, barrels, or containers
b) off site tracking of industrial materials
c) tracking or blowing of raw, fmal, or waste materials
d) evidence or, or the potential for,pollutants entering the drainage system.
2) Analytical monitoring results from sampling conducted on November 14, 2016
indicated the following exceedance.
Date Parameter Bench Mark Outfall #1 Outfall#2 Outfall#3
11/14/16 Zinc 0.067 mg/L No Flow 0.32 1.8
11/14/16 TSS 100 mg/L No Flow 520 0
It suspected that the rain fall was acidic causing the elevated level zinc and copper
levels. A possible likely source may be runoff from the corrugated galvanized
steel manufacturing building, galvanized roof drains, or the galvanized fencing.

No other sources were suspected to elevate the zinc to exceed the range was found
during the inspection.
3) There are no structural BMP's present at the facility. No retention ponds or
collection basins are present. The facility captures compressor condensate and
discharges it back to the city.None structural BMP's include the minimization of
outdoor storage,the frequent disposal of accumulated wastes, and the elimination
of any oily wastes. These non-structural BMP's appear to be adequate.
4) The stormwater discharge outfall was inspected. No evidence was seen of any
non-stormwater impacts at the outfall.
RECOMMENDATIONS
1) Continue to BMP's in accordance with the permit.
2) Regrade the yard and install erosion control (rock) in the yard receding outfall#2
3) No evidence was found that the current SWPPP has any deficiencies. No changes
to the SWPPP are recommended at this time. All current initiatives appear
adequate to meet the goals of the SWPPP. Note that the SWPPP was
implemented on 5/8/2016,prior to the date that the inspection was conducted.
CERTIFICATION
This inspection did not reveal any violations of the permit. No areas of non-compliance
with the SWPPP were noted.
Certified by:
Name: /aai,c_Paleeeie Date: 44'6
Title: Ear�or reetai4A/ree/4(are/,