2012-05-31_PERMIT FILE - M2009093

• Permit No: M2009093
• IBM Index Class Name: PERMIT FILE
• Doc Date: 5/31/2012
• Doc Name: CERTIFICATION
• From: DRMS
• To: THEISIN MINERAL
• Email Name: MAC
• Media Type: D
• Archive: No

Parameter
Units
Benchmark Values
Rationale
Frequency
Frequcy
Sample
Type
Total Suspended Solids (TSS)
mg/L
100
EPA Benchmarks
Quarterly
Grab
Facility Located at:
County Rd 23 & County Rd 21, Larimer County, uninc, CO
80549
Latitude 40.948, Longitude - 105.166
Colorado Department
of Public Health
and Environment
CERTIFICATION TO DISCHARGE UNDER
CDPS GENERAL PERMIT COR340000
STORMWATER ASSOCIATED WITH SAND & GRAVEL MINING & PROCESSING
Certification Number: COR341623
This Certification to Discharge specifically authorizes:
Theisen Mineral
to discharge stormwater from the facility identified as
Red Mountain Open Spaces
to:
Sand Creek - South Platte River
All discharges must comply with the lawful requirements of federal agencies municipalities, counties,
drainage districts and other local agencies regarding any discharges to storm drain systems, conveyances,
or other water courses under their jurisdiction.
Monitoring Requirements
Subsector J2. Dimension and Crushed Stone and Nonmetallic Minerals (except fuels) (SIC 1411, 1422 -1429, 1481, 1499)
Additional Monitoring Requirements
On the effective date of this certification, the Red Mountain Open Spaces facility is subject to the monitoring requirements
discussed below at each discharge point of stormwater from the facility.
Monitoring frequency: The permittee must collect samples of stormwater discharge from the facility once per quarter unless
otherwise directed by the Division.
Measurable Storm Event: For this certification, monitoring is only required once per quarter, regardless of the number of
measureable storm events. However, if additional samples are collected during the quarter, these additional samples must also
be included in the DMR summary as described below.
• Rain event. Permittees must conduct monitoring, as specified in the Monitoring Requirements table above, on a storm
event that results in an actual discharge from the facility (measurable storm event), and that follows the preceding
measurable storm event by at least 72 hours (3 days).
• Snowmelt event. The permittee must conduct snowmelt monitoring at a time when a measurable discharge occurs from
the facility.
Storm Event Information
• Rain event. The permittee must document the information below for each monitored event.
i. The date, time of the start of the discharge, time of sampling, duration (in hours) of the rainfall event, and magnitude
(in inches) of the storm event sampled;