NCG500604_Permit (Issuance)_20020201

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
Michael F. Easley, Governor
William G. Ross Jr., Secretary
Gregory J. Thorpe, Acting Director
February 1, 2002
Mr. Jim Merriam
BOC Group Inc.
100 Mountain Avenue
Murray Hill, NJ 07974
AVA
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
Subject: General Permit No. NCG500000
BOC Gases- Midland, NC
COC NCG500604
Cabarrus County
Dear Mr. Merriam:
In accordance with your application for a discharge permit received on September 19,
2001 we are forwarding herewith the subject certificate of coverage to discharge under the
subject state — NPDES general permit. This permit is issued pursuant to the requirements of
North Carolina General Statute 143-215 .1 and the Memorandum of Agreement between North
Carolina and the US Environmental Protection agency dated May 9, 1994 (or as subsequently
amended).
The additional requirements detailed in Todd Christenson's November 13, 2001 memo,
which is attached, must also be followed. If any parts, measurement frequencies or sampling
requirements contained in this permit are unacceptable to you, you have the right to request an
individual permit by submitting an individual permit application. Unless such demand is made,
this certificate of coverage shall be final and binding.
Please take notice that this certificate of coverage is not transferable except after notice to
the Division of Water Quality. The Division of Water Quality may require modification or
revocation and reissuance of the certificate of coverage.
This permit .does not affect the legal requirements to obtain other permits which may be
required by the Division of Water Quality or permits required by the Division of Land
Resources, Coastal Area Management Act or any other Federal or Local governmental permit
that may be required.
If you have any questions concerning this permit, please contact Aisha Lau at telephone
number [phone] ext. 578.
cc: Mooresville Regional Office
Central Files
Stormwater and General Permits Unit Files
1617 Mail Service Center, Raleigh, NC 27699-1617
An Equal Opportunity Affirmative Action Employer
Sincere]
virjytriCa
Gregory J. Thorpe, Ph.D.
Telephone [phone] FAX [phone]
50% recycled/ 10% post -consumer paper

DIVISION OF WATER QUALITY
November 13, 2001
MEMORANDUM
To: Aisha Lau — Stormwater Unit
Through: Matt Matthews
From: Todd Christenson
Subject: BOC Gases — Midland
Biocide/Chemical Treatment Use
NPDES No. NCG500604 (New applicant)
Cabarrus County
BOC Gases has requested that the biocide Spectrus OX1200 be approved for use at the above
facility. Data submitted by the facility and chemical supplier concerning dosage rates, degradation,
system volume, average daily discharge, toxicity of the active ingredient(s) and/or breakdown products,
and minimum stream flow have been reviewed and evaluated
Calculations summarized on the accompanying worksheets predict that the use of this product at the
stated dosage rates would result in a toxic impact to aquatic life in the receiving stream. However, a
treatment methodology has been proposed by the facility which would allow the use of this product.
Therefore, the use of this product is deemed acceptable for use at BOC Gases — Midland with the
following conditions:
• The effluent waters are to be detoxified with a reducing agent (e.g. Spectrus DT1404).
• The effluent is to be measured in the detention pool prior to discharge for Total Residual
Chlorine (TRC) by an approved.m.ethod. All active halogens will be detected as chlorine.
• Once the permit has been approved, :the facility will provide data from five consecutive tests for
total residual chlorine (1 test per day for 5 days) which demonstrate that TRC is being reduced to
non -detectable levels (i.e. 0.00) prior to discharge. This will indicate the absence of biocidal
activity in the effluent. This data should be faxed to Todd Christenson, Aquatic Toxicology Unit
at 919-733-9959 once the tests are completed.
If there are questions concerningiH'review please contact me at [phone].
Attachments
cc: Central files
Jim Merriam, BOC Gases

STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
GENERAL PERMIT NO. NCG500000
CERTIFICATE OF COVERAGE No. NCG500604
TO DISCHARGE NON -CONTACT COOLING WATER, COOLING TOWER AND BOILER BLOWDOWN,
CONDENSATE AND SIMILAR WASTEWATERS UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215.1, other lawful standards and
regulations promulgated and adopted by the North Carolina Environmental Management Commission, and the
Federal Water Pollution Control Act, as amended,
BOC Gases
is hereby authorized to discharge non -contact cooling water, condensate, and similar wastewaters from a facility
located at
BOC Gases - Midland
3537 Fieldstone Trace
Midland
Cabarrus County
to receiving waters designated as an unnamed tributary to Muddy Creek, a class C stream in the Yadkin River Basin
in accordance with the effluent limitations, monitoring requirements, and other conditions set forth in Parts I, II, III
and IV hereof.
This certificate of coverage shall become effective February 1, 2002.
This Certificate of Coverage shall remain in effect for the duration of the General Permit.
Signed this day February 1, 2002.
Gregory J. Thorpe, Actingirector
Division of Water Quality
By Authority of the Environmental Management Commission

NCG500604-BOC Gases , fVlidland (4

Markers
Name: NCG500604-BOC Gases - Midland
Short Name: 500604
Coordinates: 035° 13' 06.2" N, 080° 31' 14.2" W
Comment: County: Cabarrus, Map #:G16NE, Subbasin: 030712, Receiving Stream: UT Muddy
Creek, Class: C