|
PARTI
<br />Page No. 8
<br />PetmitNo.: CO-0034142
<br />MONTTORING REQUIREMENTS
<br />Frequency and Sample Tvce (Continued)
<br />Self-monitoring sampling by the pemtittee for compliance with the monitoring requirements specified above shall be performed at
<br />the following locations: Outfalls 004, 007, 009, 011, 012, 013, 014, 015, 016, 017, 018, 019, 020, and 021, the dischazges from
<br />swface runoff, before entering either the Wi]]iams Fork and/or the Yampa Rivers. Outfalls 003, 022, and 024 are the dischazges
<br />from swface runoff, mine spoil springs water, and seepage from the mine dewatering system, before entering either the Williams
<br />Fork and/or the Yampa Rivers. Outfall 024 is discharge from domestic wastewater, swface nmoff,-mine spoil springs water, and
<br />seepage from the mine dewatering system, before entering either the WtTliams Fork River. ,
<br />If the permittee, using the approved analytical methods, monitors any parameter more frequently than required by this permit, then
<br />- the results of such monitoring shall be included in the calculafion and reporting of the values required in the Discharge Monitoring
<br />ReportForm (DIvIRs), or other forms as required by the Division. Such increased frequency shall also be indicated:
<br />e) Oi] and Grease Monitorin¢
<br />
<br />For every outfall with oil and grease monitoring, in the event an oil sheen or floating oil is observed, a grab. sample shall be
<br />collected, analyzed, and reported on the appropriate DMR, In addition, corrective action shall be taken immediately to
<br />mitigate the_discharge of oil and grease. A description of the corrective action taken should be included with the DMR.
<br />2. Sa]inityParameters
<br />c>
<br />Analysis for salinity shall be required in al] industrial permits that dischazge in the Colorado River Basin. In order to obtain an
<br />indication of the quantity of Salinity being discharged from the site, which is measured as -total dissolved solids ('I'DS), or by
<br />electrical conductivity (where satisfactory correlation with TDS has been established), the permittee shall monitor the wastewater
<br />effluent at the following frequencies:
<br />Outfall Frequency Samnle Tytx
<br />003-004, 007, 009, and 011-024 Quarterly Grab
<br />Self-monitoring sarttlrles taken incompliance with the monitoring requires specified above shall be taken at.those:locations listed in
<br />PartlB.l. - -
<br />C. DEFINITIONS OF TERMS
<br />1. "Composite" sample is a minimum of four grab samples collected at equally spaced two hour intervals and proportioned according
<br />to flow.
<br />2. "Continuous" measwement, is a measwement obtained from an automatic recording device which continually measwes provides
<br />measwements.
<br />3. "Chronic lethality" occws when a statistically significant difference, ai the 95% confidence level, ocews in the chronic test between
<br />the mortality of the test species in 100% effluent (the chronic 7WC = 28,3%) and the control.
<br />4. "Daily Maximum ]imitation" means the limitation for this parameter shall be applied as an instantaneous maximum (or, for pH o:
<br />DO, instantaneous minimum) valve. The instantaneous value is defined as the analytical result bf any individual sample. DMR',
<br />shall include the maximum (and/or minimum) of all instantaneous values within the calendar month. Any instantaneous value
<br />beyond the noted daily maximum limitation for the indicated parameter shall be considered a violation of this permit
<br />5. "Fecal coliform bacteria" thirty (30) day and seven (7) day averages shall be deterrnined as explained in 11. and 12. below
<br />respectively, except that the geometric mean shall be used instead of the arithmetic mean. -
<br />The geometric mean may be calculated using two different methods. For the methods shown, a, b, c, d, etc. aze individual sarrtpl
<br />results, and n is the total number of samples.
<br />ub]
<br />Method 1: Geometric Mean = {a'b•c'd•...) "*" -means multiply
<br />Method 2: Geometric Mean = antilog ([log(a)+log(b)+log(c)+log(d)+...]/n )
<br />Graphical meilrods, even though they may also employ the use of logarithms, may introduce significant error and may not be used
<br />
|