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PART I
<br /> Page 8 of 26
<br /> Permit No.:CO0000003
<br /> 4. "Continuous"measurement,is a measurement obtained from an automatic recording device which continually measures the
<br /> effluent for the parameter in question,or that provides measurements at specified intervals.
<br /> 5. "Daily Maximum limitation" for all parameters(except temperature,pH and dissolved oxygen)means the limitation for this
<br /> parameter shall be applied as an average of all samples collected in one calendar day. For these parameters the DMR shall
<br /> include the highest of the daily averages. For pH and dissolved oxygen,this means an instantaneous maximum(and/or
<br /> instantaneous minimum)value. The instantaneous value is defined as the analytical result of any individual sample. For pH
<br /> and dissolved oxygen, DMRs shall include the maximum(and/or minimum)of all instantaneous values within the calendar
<br /> month. Any value beyond the noted daily maximum limitation for the indicated parameter shall be considered a violation of
<br /> this permit. For temperature,see Daily Maximum Temperature.
<br /> 6. "Daily Maximum Temperature(DM)"is defined in the Basic Standards and Methodologies for Surface Water 1002-31, as
<br /> the highest two-hour average water temperature recorded during a given 24-hour period. This will be determined using a
<br /> rolling 2-hour maximum temperature. If data is collected every 15 minutes,a 2 hour maximum can be determined on every
<br /> data point after the initial 2 hours of collection. Note that the time periods that overlap days(Wednesday night to Thursday
<br /> morning)do not matter as the reported value on the DMR is the greatest of all the 2-hour averages.
<br /> For example data points collected at:
<br /> 08:15,08:30,08:45,09:00,09:15,09:30,09:45, 10:00,would be averaged for a single 2 hour average data point
<br /> 08:30,08:45,09:00,09:15,09:30,09:45, 10:00, 10:15,would be averaged for a single 2 hour average data point
<br /> 08:45,09:00,09:15,09:30,09:45, 10:00, 10:15, 10:30,would be averaged for a single 2 hour average data point
<br /> This would continue throughout the course of a calendar day. The highest of these 2 hour averages over a month would be
<br /> reported on the DMR as the daily maximum temperature. At the end/beginning of a month,the collected data should be used
<br /> for the month that contains the greatest number of minutes in the 2-hour maximum. Data from 11 pm to 12:59 am,would
<br /> fall in the previous month. Data collected from 11:01 pm to 1:00 am would fall in the new month.
<br /> 7. "Dissolved(D)metals fraction" is defined in the Basic Standards and Methodologies for Surface Water 1002-31,as that
<br /> portion of a water and suspended sediment sample which passed through a 0.40 or 0.45 UM(micron)membrane filter.
<br /> Determinations of"dissolved"constituents are made using the filtrate. This may include some very small(colloidal)
<br /> suspended particles which passed through the membrane filter as well as the amount of substance present in true chemical
<br /> solution.
<br /> 8. "Geometric mean"for E. coli bacteria concentrations,the thirty(30)day and seven(7)day averages shall be determined as
<br /> the geometric mean of all samples collected in a thirty(30)day period and the geometric mean of all samples taken in a seven
<br /> (7)consecutive day period respectively. The geometric mean may be calculated using two different methods. For the
<br /> methods shown,a,b,c,d,etc.are individual sample results,and n is the total number of samples.
<br /> Method 1:
<br /> (1/n)
<br /> Geometric Mean=(a*b*c*d*...) "*" -means multiply
<br /> Method 2:
<br /> Geometric Mean=antilog( [log(a)+log(b)+log(c)+log(d)+...)/n)
<br /> Graphical methods,even though they may also employ the use of logarithms, may introduce significant error and may not be
<br /> used.
<br /> In calculating the geometric mean,for those individual sample results that are reported by the analytical laboratory to be"less
<br /> than" a numeric value,a value of 1 should be used in the calculations. If all individual analytical results for the month are
<br /> reported to be less than numeric values,then report"less than"the largest of those numeric values on the monthly DMR.
<br /> Otherwise,report the calculated value.
<br /> For any individual analytical result of"too numerous to count" (TNTC),that analysis shall be considered to be invalid and
<br /> another sample shall be promptly collected for analysis. If another sample cannot be collected within the same sampling
<br /> period for which the invalid sample was collected(during the same month if monthly sampling is required,during the same
<br /> week if weekly sampling is required,etc.),then the following procedures apply:
<br /> i. A minimum of two samples shall be collected for coliform analysis within the next sampling period.
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