2023-10-31_REVISION - M1973021 ‎(10)‎

• Permit No: M1973021
• IBM Index Class Name: Revision
• Doc Date: 10/31/2023
• Doc Name Note: Attachment B - Appendix C - CDPHE Permit and Stormwater Management Plan
• Doc Name: Request for Technical Revision
• From: Holcim - WCR, Inc.
• To: DRMS
• Type & Sequence: TR9
• Media Type: D
• Archive: No

pH, (Minimum-
Maximum) S.u. NA NA 6.5-9.0 2x/month Grab
00400
Total Suspended
Solids, mg/l 30 45 NA 2x/month Grab
00530
Oil and Grease Visual NA NA NA 2x/month Visual2
84066
Oil and Grease, mg/l NA NA 10 Contingent2 Grab
03582
Site Specific Limitations
Electrical
Conductivity (EC), dS/m Report NA NA Quarterly Grab
00094
Phosphorus, Total' mg/l Report NA NA Monthly Grab
00665
1: Flow - The chronic flow limit is equal to the flow rate provided in the permit application, and will be
stated on the certification. If power is not available, flow may be measured on an instantaneous basis.
2: Oil and Grease: - A visual observation of the discharge for each permitted outfall must be made
2x/month. In the event an oil sheen or floating oil is observed, a grab sample shall be collected,
analyzed, and reported on the DMR. In addition, corrective action shall be taken immediately to
mitigate the discharge of oil.
3: Total Phosphorus - Analysis for Total Phosphorus, as P, will be included in the permit certification
for all discharges to waters with a control regulation for P.
Stormwater Monitoring Requirements
Permit Limitations and/or Monitoring Requirements apply to outfall(s) 001A, 003A, 004A, and 006A as
outlined in the Permit in Part I.C.2 and Parts I.G through I.Q.
On the effective date of this certification, the Morrison Quarry is subject to the monitoring requirements
identified below at each discharge point of stormwater from the facility.
A. Visual monitoring, Part U.1
Per Part 1.1.1 of the permit, the permittee must collect a stormwater sample from each outfall (or a
substantially identical outfall pursuant to Part I.H.1 of the permit) and conduct a visual assessment
of each of these samples once each quarter for the entire permit term.
B. WQBEL/Water Quality Standards monitoring, Part 1.1.3 and 4
Discharges authorized under this permit must be controlled as necessary to meet applicable water
quality standards.
Stormwater Reporting Requirements
ICIS Description Due date Frequency
Code
The permittee shall submit an annual report to the
00308 division for the reporting period January 1 through February 28 Annual (10)
December 31.
Page 2 of 3
4300 Cherry Creek Drive S.,Denver,CO 80246-1530 P 303-692-2000 www.colorado.gov/cdphe/wgcd