NCG140335_Renewal Letter with COC_20110801

A'
NCDENR
North Carolina Department of Environment and Natural Resources
Beverly Eaves Perdue
Governor
Concrete Supply Co
PO Box 5247
Charlotte, NC 28299
Dear Permittee:
Division of Water Quality
Coleen H. Sullins
Director
August 1, 2011
Dee Freeman
Secretary
Subject: NPDES Stormwater Permit Coverage Renewal
Concrete Supply Co -Mooresville
COC Number NCG140335
Iredell County
In response to your renewal application for continued coverage under stormwater General Permit NCG140000
the Division of Water Quality (DWQ) is forwarding herewith the reissued General Permit. This permit is reissued
pursuant to the requirements of North Carolina General Statute 143-215.1 and the Memorandum of Agreement
between the state of North Carolina and the U.S. Environmental Protection Agency, dated October 15, 2007 (or
as subsequently amended).
The following information is included with your permit package:
• A new Certificate of Coverage
• A copy of General Permit NCG140000
• A copy of the Technical Bulletin for the General Permit
• Two copies of the Discharge Monitoring Report (DMR) Form for Stormwater
• Two copies of the DMR Form for Wastewater
• Two copies of the Qualitative Monitoring Report Form
The General Permit authorizes discharges of stormwater and/or wastewater, and it specifies your obligations with
respect to discharge controls, management, monitoring, and record keeping. Please review the new permit to
familiarize yourself with all the changes in the reissued permit. If your Certificate of Coverage (COC) restricts
authorization to discharge stormwater only (or other limited terms), you must contact the Stormwater Permitting
Unit if you would like to request a modification to your COC.
The first sample period of your permit begins July 1, 2011. However, because of the delayed mail -out of permit
packages, your facility is expected to attempt to sample during the first sampling period, and must comply with
sampling requirements beginning during the second sampling period. Your facility must sample a representative
storm event between January 1 and July 30, 2012 (for stormwater sampling), and/or sample wastewater between
October 1, 2011 and December 31, 2011 (or, if applicable, report "No Flow", as outlined in Part V, Section E).
Additionally, your facility has 6 months from the time of receipt of the permit to update SPPP to current standards.
The more significant changes in the General Permit since your last Certificate of Coverage include the following
(please note the names and numbers of sections have been changed from the previous permit revision):
Part II:
• Authorization to Construct (ATC) language was added to the permit and adapted to fit NCG140000.
Part III:
• The Stormwater Pollution Prevention Plan (SPPP) section has been updated to the most current
language of our permits. Some additional conditions specific to this industry have been added to the
SPPP language.
Part IV:
• Sections A & B: Revised provisions require stormwater discharges be sampled twice per year (instead of
annually), and sampling results shall be compared to new benchmark values. (The previous cut-off
concentrations have been removed).
• Sections A & B: Revised provisions require the permittee to execute Tier One, Two & Three response
actions: Tier One requirements for a first benchmark exceedence, and/or Tier Two response for a second

consecutive benchmark exceedence, if applicable. Tier Two requires that the permittee institute monthly
monitoring (reported to the appropriate Regional Offices) instead of twice -per -year monitoring. Monthly
monitoring shall be done until three consecutive monitoring events show no benchmark exceedences.
• Sections A & B: This permit now contains a provision that four exceedences of any benchmark will trigger
increased DWQ involvement in the permittee's stormwater management and control actions (Tier Three).
DWQ may direct the permittee to apply for an individual permit, institute specific monitoring, or may direct
the implementation or installation of specific stormwater control measures.
• Sections A & B: Failure to perform analytical stormwater monitoring requires that the permittee begin a
monthly sampling scheme for both industrial stormwater discharges and/or stormwater discharges from
VMA areas (where applicable). After 6 months of monthly sampling, the permittee may return to semi-
annual sampling, unless otherwise specified by DWQ.
• Sections A & B: A lower TSS benchmark of 50 mg/I for HQW, ORW, PNA and Tr Waters was added to
this permit for these more sensitive waters.
• Section B: The monitoring parameter Oil & Grease has been replaced by the parameter Total Petroleum
Hydrocarbons.
• Sections A, B & C: Inability to sample due to adverse weather must be reported in the SPPP.
• Sections A, B & C: The terminology "Representative Storm Event" has been replaced by "Measurable
Storm Event" in response to comments from industry groups. A measurable storm event is a storm event
that results in an actual discharge from the permitted site outfall. The previous measurable storm event
must have been at least 72 hours prior, unless the permittee is able to document that a shorter interval is
representative for local storm events during the sampling period, and obtains written approval from the
local DWQ Regional Office.
• Section C: Qualitative monitoring must now be conducted semi-annually and is tied to the same
measurable storm event as the analytical monitoring.
• Section C: If the permittee fails to respond effectively to problems identified by qualitative monitoring, the
permittee may be required by DWQ to perform corrective action.
• Section D: This section has now been consolidated to one section with one set of combined tables for all
types of authorized wastewater discharges.
• Section D: The wastewater analytical monitoring schedule has been set to quarterly.
• Section D: TSS limits have been revised for PNA, Trout and HQW waters per rule requirements in 15A
NCAC 02B.0224.
• Section D: 7Q10 -based flow limits have been set for PNA waters per regulations in 15A NCAC 02B.
• Section D: TPH monitoring requirements have been added to wastewater monitoring when stormwater
runoff from VMA areas commingles with wastewater.
• Section D: This wording in the permit has been removed: "For facilities which route stormwater and all
process wastewater to a recycle system, no analytical monitoring of process wastewater discharges is
required if that recycle system discharges as a result of a 10 -year 24-hour (or larger) precipitation event."
Part V:
• Section A: For existing facilities previously permitted and applying for renewal under this General Permit:
New elements of the Stormwater Pollution Prevention Plan for this permit renewal shall be developed and
implemented within 6 months of the effective date of the initial Certificate of Coverage issued pursuant to
this General Permit and updated thereafter on an annual basis.
Your coverage under the General Permit is transferable only through the specific action of DWQ. This permit does
not affect the legal requirements to obtain other permits which may be required by DENR, nor does it relieve the
permittee from responsibility for compliance with any other applicable federal, state, or local law, rule, standard,
ordinance, order, judgment, or decree. If you have any questions regarding this permit package please contact
these members of the Stormwater Permitting Unit: Jennifer Jones [phone], Ken Pickle [phone], or
Bethany Georgoulias [phone].
Sincerely,
for Coleen H. Sullins
cc: DWQ Central Files
Stormwater Permitting Unit Files
Mooresville Regional Office

STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE No. NCG140335
STORMWATER AND/OR PROCESS WASTEWATER
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,
Concrete Supply Co
is hereby authorized to discharge stormwater and/or wastewater from a facility located at and/or
operate an approved wastewater treatment system located at:
Concrete Supply Co -Mooresville
123 Haney Way
Mooresville
Iredell County
to receiving waters designated as Reeds Creek, a class WS-IV,B waterbody in the Catawba River
Basin in accordance with the effluent limitations, monitoring requirements, and other conditions set forth
in Parts I, II, III, IV, V, and VI of General Permit No. NCG140000 as attached.
This certificate of coverage shall become effective August 1, 2011.
This Certificate of Coverage shall remain in effect for the duration of the General Permit.
Signed this 1St day of August, 2011.
for Coleen H. Sullins, Director
Division of Water Quality
By Authority of the Environmental Management Commission