2012-03-07_PERMIT FILE - C2010088 ‎(21)‎

• Permit No: C2010088
• IBM Index Class Name: Permit File
• Doc Date: 3/7/2012
• Doc Name: Other Permits
• Section_Exhibit Name: Exhibit 13
• Media Type: D
• Archive: No

COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT
Water Quality Control Division
WQCD -P -B2
4300 Cherry Creek Drive South
Denver, Colorado 80246 -1530
RATIONALE
STORMWA TER DISCHARGES ASSOCIATED WITH
LIGHT INDUSTRIAL ACTIVITY
GENERAL PERMIT IN COLORADO
THIRD RENEWAL
COLORADO DISCHARGE PERMIT NUMBER COR- 010000
L INTRODUCTION
The permit is for the regulation of stormwater runofffii-om a wide variety of types of light industry. This Rationale will explain
the background of the Stormwater program, which industries are covered under this permit, how to applyfor coverage under this
permit, and what the permit requirements are.
A. Changes in this General Permit
1. Small Municipal Exemption: The previous Rationale included a discussion of the exemption from industrial stormwater
permitting for small municipalities. This exemption ended as of March 10, 2003. Municipalities under 100,000
population are now subject to the same Stormwater permitting requirements for their industrial facilities (e.g., gravel
pits, wastewater treatment plants, construction projects) as other facility owners and operators. See
h 11y:/ hr, vn. rdphcstute. <o.u.� /►vy /PumilsUnidSlf' -M,nri Inrl- O.4.nd %forfurtherinformation. No changes were made to l
the permit for this item.
2. Application Requirements: The permit application requirements have changed slightly to require an email address. if
available. See Part LA.2. b.
3. Temporary Covera—ge: Part LA.3.d of the permit dealt with temporarily covering a facility under the general permit
even if an individual permit is more appropriate. This section essentially duplicated the previous section, and so it has
been deleted.
4. Batch Plants: Information has been added to Part LA.7 of the permit, indicating that a batch plant that is dedicated to
a specific construction site may instead be covered under a CDPS Construction Stormwater general permit certification
issued to that site, provided that the site's SWMP includes adequate provisions fur the batch plant.
S. Stormwater Management Plan (SWMP)
a) Compliance Schedule: For newly certified facilities, if the SWMP prepared in conjunction with the permit
application requires a compliance schedule, it generally shall not exceed 60 days. See Part I.B.
b) Site Map: The requirements for the SWMP have been changed to add several items to the site map, such as areas
of industrial activities, potential pollutant sources, and sampling point. If a permittee's existing SWMP does not
already contain these items, the plan must be amended to comply with these changes, by September 1, 2006. See
Part LB.2.
c) SWMP Certification: The previous permit included a requirement that the copy of Stormwater Management Plan
that remains at the facility had to include the certification language and signature, as described in Part I.D.5.a.
This requirement has been deleted. The signatory requirements of Part LD.5.a only apply to the SWMP if it is to
be submitted to the Division or to EPA. See Part L C.2, b.
ISSUED MAY 31, 2006 EFFECTIVE JULY 1, 2006 EXPIRATION DATE JUNE 30, 2011