HYDRO25505

• Permit No: C1981019
• IBM Index Class Name: Hydrology
• Doc Date: 2/2/2005
• Doc Name: Issued Permit ‎(CO-0045161)‎
• From: WQCD
• To: Colowyo Coal Company L.P.
• Permit Index Doc Type: NPDES
• Media Type: D
• Archive: No

r
rC. DEFINITIONS OF TERMS (continued)
PART[
Page No. 6
Permit No.: CO-0045161
13. "Seven (7) day average" means, with the exception of fecal coliform bacteria, the arithmetic mean of all samples collected in a seven
(7) consecutive day period. For fecal coliform bacteria, it is the geometric mean of all samples taken in a seven (7) consecutive day
penod. Such seven (7 day averages shall be calculated for all calendaz weeks, which aze defined as beginnmg on Sunday and
endm on Saturday. Tf}the calendaz week overlaps two months (i.e. the Sunday is in one month and the Saturday m the following
monthg}, the seven (7) day average calculated for that calendar week shall be associated with the month that contains the Satwday.
Samples may not be used for more than one (1) reporting period. (Not applicable to fecal coliform determinations.)
14. "Thirty (30) day average" means, exceppt for fecal coliform bacteria, the arithmetic mean of all samples collected during a ~h~r~. (30)
consecutive-day period. For fecal coliform bacteria, it is the geometric mean of all samples collected m a thirty (30) day penod. The
permittee shall report the appropriate mean of all self-monitoring sample data collected druing the calendar month on the Discharge
Monitoring Reports. Samples shall not be used for more than one (1) reporting period.
15. "Total Metals" means the concentration of metals determined on an unfiltered sample following vigorous digestion (Section 4.1.3),
or the sum of the concentrations of metals in both the dissolved and suspended fractions, as descnbed m "Manual of Methods for
Chemical Analysis of Water and Wastes," U.S. Environmental Protection Agency, March 1979, or its equivalent.
16. "Total Recoverable Metals" means that portion of a water and suspended sediment sample measwed by the total recoverable
analytical procedwe described in "Methods far Chemical Analysis of Water and Wastes, " U.S. Environmental Protection Agency,
Mazch 1979 or its equivalent.
17. "Twenty four (24 hour composite" sample is a combination of at least eight (8) le aliquots of at least 100 milliliters, collected
at equally spaced intervals during the operatmg hows of a facility over atwenty-fow (24) how period. For volatile pollutants,
aliquots must be combined in the laboratory mimedia[ely before analysis. The composite must be flow proportional; either the time
interval between each aliquot or the volume of each aliquot must be proportional [o either the wastewater or effluent flow at the time
of sampling or the total wastewater or effluent flow since the collection of the previous aliquot. Aliquots maybe collected manually
or automatically.
18. "Twice Monthly" monitoring frequency means that two samples shall be collected each calendar month on separate weeks with at
least one full week between the two sample dates. Also, there shall be at least one full week between the second sample of a month
and the first sample of the following month.
19. "Visual" observation is observing the dichazge to check for the presence of a visible sheen or floating oil.
20. "Water Quality Control Division" or "Division" means the state Water Quality Control Division as established in 25-8-101 et al.)
Additional relevant definitions are found in the Colorado Water Quality Control Act, CRS §§ 25-8-101 et sue, the Colorado
Discharge Permit System Regulations, Regulation 61 (5 CCR 1002-61 and other applicable regu ations.
D. SPECIAL REQUIREMENTS
1. Materials Containment Plan
Pursuant to Sections 61.8(3)(e) and (r) of the Colorado Discharge Permit System Regulations, the pemtittee is required to submit a
Materials Containment Plan. ~-SSuch a plan was previously submitted to the Division. An update of the plan shall be submitted to the
Division within ninety (90) days after the effective date of this permit and must be ' lemen[ed. The update of the plan shall include
changes in the information and procedwes for the prevention and containrrient of spills of materials used, processed or stored at the
facihtiy~vhich 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 necessanly be limited to:
a. An updated history of the spills, which have occuned in the three (3) years preceding the effective date of [his pernut. The
history shall include a discussion on the cause of the spills and a the preventative measwes designed to eliminate them from
reoccumng;
b. An update of the reporting system which will be used to notify, at a mininnnn, responsible facility management, the Division, the
Environmental Protection Agency, downstream water users within 5 miles downstream of the 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;
d. A cunent list which includes the volumes or quantities of all materials used, processed, or stored at the facility which represent a
potential spill threat to surface waters. The location of stored material shall be indicated on the facility plot submitted for item c;
e. An implementation schedule for additional facilities which might be required in item c, but which aze not yet operational;
f. A current list of available outside contractors, agencies, or other sowces which could be utilized in the event of a spill in order to
clean up its effects. If the facility is capable of handling spills in-house, this shall be documented in the plan;
g. Provision for yearly review and updating of the contingency plan, plus resubmission of the plan to the Division if conditions
and/or procedwes at the facility change the original plan.
The foregoing provisions shall in no way render inapplicable those requirements imposed by the Federal Water Pollution Control
Act, 33 U.S.C. § ]321, regulations promulgated thereunder, the Colorado Water Quality Control Act, and regulations promulgated
thereunder. It is recommended that a professional engineer registered in the State of Colorado prepare this plan.
ReviuO 1lLt2005