PERMFILE72825

• Permit No: C1994082
• IBM Index Class Name: Permit File
• Doc Date: 12/18/2006
• Doc Name: NPDES Permit
• Section_Exhibit Name: Tab 15 Appendix 15-1
• Media Type: D
• Archive: No

PARTI
Page No. 25
• Permit No.: CO-0000221
consecutive day period. Such seven (7) day averages shall be calculated for all calendar weeks, which are defined as
beginning on Sunday and ending on Saturday. If the calendar week overlaps two months (i.e. the Sunday is in one month and
the Saturday in the following month), the seven (7) day average calculated for that calendar week shall be associated with the
month [hat contains the Saturday. Samples may no[ be used for more, than one (1) reporting period. (Not applicable to fecal
coliform determinations.)
13. "Thirty (30) day average" means, except for fecal coliform bacteria, the arithmetic mean of all samples collected during a
thirty (30) consecutive-day period. For fecal coliform bacteria, i[ is the geometric mean of all samples collected in a thirty
(30) day period. The permittee shall report the appropriate mean of all self-monitoring sample data collected during the
calendar month on [he Discharge Monitoring Reports. Samples shall not be used for more than one (1) reporting period.
14. "Total Metals" means the concentration of metals determined on an unfiltered sample following vigorous digestion (Section
4.1.3), or the sum of [he concentrations of metals in both [he dissolved and suspended fractions, as described in "Manual of
tflethodsfor Chemical Analysis of Water and Wastes," U.S. Environmental Protection Agency, March 1979, or its equivalent.
15. "Total Recoverable Metals" means that portion of a water and suspended sediment sample measured by the total recoverable
analytical procedure described in "Methods for Chemical Analysis oJWater and Wastes, " U.S. Environmental Protection
Agency, March 1979 or its equivalent.
16. "Twenty four (24) hour composite" sample is a combination of at leas[ eight (8) sample aliquots of at least 100 milliliters,
collected at equally spaced intervals during the operating hours of a facility over a twenty-four (24) hour period. For volatile
pollutants, aliquots must be combined in the laboratory immediately before analysis. The composite must be flow
proportional; either [he time interval between each aliquot or the volume of each aliquot must be proportional [o either the
wastewater or effluent flow a[ the time of sampling or the total wastewater or effluent flow since the collection of the previous
• aliquot. Aliquots may be collected manually or automatically.
17. "Twice Monthly" monitoring frequency means that two samples shall be collected each calendar month on separate weeks
with a[ least one full week between the two sample dates. Also, there shall be a[ least one full week between the second
sample of a month and the first sample of the following month.
18. "Visual" observation is observing the discharge to check for the presence of a visible sheen or floating oil.
t9. "Water Quality Control Division" or "Division" means the state Water Quality Control Division as established in 2~-8-101 et
al.)
Additional relevant definitions are found in the Colorado Water Quality Control Act, CRS §§ 25-8-101 et seq., the Colorado
Discharge Permit System Regulations, Regulation 61 (5 CCR 1002-61) and other applicable regulations.
D. SPECIAL REQUIREMENTS
1. Materials Containment Plan
Pursuant [o Sections 61.8(3)(g) and (r) of the Colorado Discharge Permit System Regulations, the petmittee is required to
submit a Materials Containment Plan. Such a plan was previously submitted to the Division. An update of the plan shall be
submitted [o the Division within ninety (90) days after the effective date of this perrrtit and must be implemented. The update
of the plan shall include changes in the information and procedures for the prevention and containment of spills of materials
used, processed or stored ai the facility which if spilled would have a reasonable probability of having a visible or otherwise
detrimental impact on waters of the State ~?~. The updated plan shall include, but not necessarily be limited to:
a. An updated history of the spills which have occurred in the three (3) years preceding the effective date of [his permit.
The history shall include a discussion on the cause of the spills and a the preventative measures designed to eliminate
them from reoccurring;
b. An update of [he reporting system which will be used m notify, at a minimum, responsible facility management, the
Division, the Enviromnental Protection Agency, downstream water users within 5 miles downstream of [he facility, and
local health officials;
c. A description of any changes in the preventative facilities (including overall facility plot) which prevent, contain, or treat
spills and unplanned discharges;