HYDRO31380

• Permit No: M1974004
• IBM Index Class Name: Hydrology
• Doc Date: 10/31/1992
• Doc Name: CERTIFICATION CDPS GENERAL PERMIT STORMWATER DISCHARGES ASSOCIATED WITH SAND AND GRAVEL
• Media Type: D
• Archive: No

COLORADO DEPARTMENT OF HE1L77i, WQuality Contra! Division •
Rationale -Page 3. Petmit No. COG-SOOiWb
171. COVERAGE UNDER TH/S PERMIT
districts or arty entity Heated by or pursuam to State law. (Note: the Transportation Act user a different
clarshcation scheme for municipalities than is outlined in EPA's municipal atormwattr permit requiremems. Under
the Transportation Act, the deterotination of the size of a municipality include the total populari,~n of the
municipality. For example, a rnunty with a total population of om 100,000 is not eligible for nu Transportation
Act exemption, eHCn though the same musty may nor be required to obtain a municipal permit.)
Stormwater discharger associated with industrial activity (except for airports, steam electric power plants, or
uncontrolled sanitary landfrllsJ, that are owned or operated by o minor municipality are not required to apply for
or obtain a stormwater permit at this time. (Note: This exemption does not apply to other, pris+uety owned
industries within the same minor municipality.)
These facilities are not pnmanemfy exempted from the regulation, but are instead placed in Phase II of the
stormwtuer program. Phase II faclities, including minor municipalities, are currently under a moratorium, which
exempts them from permit requiremems under the stormwater program. It is expected that mr+rrzge will be
required at some future dare.
IV APPL/CA7TON AND CERTTFICA770N
A. Additional Aoalicotlan Reauinments
With the inclusion of atormwater provisions in this pmnit, the application requirements havr changed to some event
as well. /n addition to the application requiremems outlined in the previous permit, the following must also be
submined:
1. Description of stornrwater discharges, including drainage area
2. Description of present and proposed best managemem practicrs at site, including map.
3. Any existing water quality data on stormwater discharges.
4. For new facilities (beginning operations after October 1, 1992), and jar all other facilities applying aftn
July 1, 1993, aertifrcation as to the preparation of a SWMP. (See Section V.B.3.a ojthe Rationale for SWMP
mtifrcation requiremems for existing facilities applying on time. J
B. Permit Certifications
This permit is made up of several parts, some of which do not apply to all pnminees (i.e., while most faclitier wi/l
require covrrage under the stormwater section I. C, marry will Hat require coverage under the process water section
1.B). Therefore, the individual certification prepared for each applicam will indicate whether or not Part I.B of the
permit must be jolbwed by that applicant. In all cases (acept as noted in Section I/LC, above). Pan I.C must be
followed. (/n the absence of such indication from the Division, the pnmittee will be responsible for determining
and then complying with the applicable sections in Part LJ /n addition, all oermittees wall be required to comply
with Par! I, subparts A, D, E and F, and aB of Part ll of the permit.
V. TERMS AND COND/770NS OF PERMIT
A. Process Water Dsschages
Numeric Limitations: Numeric limits will be applied far some of the industrial categories covered by this
permit. These limits are from the EPA Federal Guidelines for the applicable poim source category, err follows:
a. Mineral mining and processing poim source category - 40 CFR 436 - subpart B (crushed stone), C
(construction sand and gravel), D (industrial sand), R (phosphate rock) -and all otha• industrial facilities
cosrred under SIC Code 14, except those spec~cally listed in paragraphs b and c be4~w, and concrete