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PART I <br />Page x <br />Permit No. CO-0042161 <br />• <br />C. DEFINITIONS OF TERMS <br />5. "Dissolved Aluminum' monitoring shall be required only if a chemical containing aluminum is used at the facility and <br />may be in the effluent stream. <br />6. "Fecal coliform bacterii thirty (30) day and seven (7) day averages shall be determined as explained in 11. and 12. <br />below, respectively, except that the geometric mean sball be used instead of the arithmetic mean. <br />T'he geometric mesa may be calculated using two different methods. For the methods shouv, a, b, c, d, etc. are <br />individual sample results, and o is the total number of samples. <br />era <br />Method I: Geometric Mean = (a•b"c"'d-...) "'' -means multiply <br />Method 2: Geometric Mean = antilog ([log(a)+log(b)+log(c)+log(d)+...]/o) <br />Graphical methods, even though they may also employ the use of logarithms, rosy introduce significant ertor and may <br />not be used. <br />In calculating the geometric mesa, for those individual sample results that are reported by the analytical laboratory to be <br />"less rhea" a numeric value, the numeric value shall be used is the calculations unless the result is "less rhea 2.2'. If <br />the result is 'less than 2.2', use a value of I in the calculations. If all individual analytical results for the month are <br />reported to be lest than oumuic values, they report "less than" the largest of those numeric values on the monthly <br />DMR. Otherwise, report the calculated value. <br />• For any individual analytical result of "too numerous to count' ('I'NTC), that analysis shall be considered to be invalid <br />and wother sample shall be promptly collected for malysis. <br />If soother sample carrot be wllxted within the same sampling period for which the invalid sample was collected <br />(during the same month if monhly sampling is required, during the same week if weekly sampling is required, etcJ, <br />then the following procedures apply: <br />i) A minimum of two samples shall be collected for coliform analysis within the next sampling period. <br />ii) If the samolin¢ frequency is monthly or less frequent: For the period with the invalid sample results, leave the <br />spaces on the corresponding DMR for reporting wliform results empty end attach to the DMR a letter noting that a <br />result of TNTC was obtained for that period, and explain why another sample for that period had not been collected. <br />If the semolina frequency is more frequent than monthly: Eliminate the result of TNTC from any further <br />calatlations, and use all the other results obtained within that month for reporting Purposes. Attach a letter noting <br />that a result of TNTC was obtained, sad list all individual malytical results and cortrsponding sampling dates for <br />that month. <br />7. 'Grab' sample, is a single 'dip and take' sample so as to be representative of the parameter being monitored. <br />8. 'In-situ' ~~.~ment is defined as a single reading, observation or measurement taken in the field at the point of <br />discharge. <br />9. "Instantaneous" measurement is a single reading, observation, or measurement performed on site using existing <br />• monitoring facilities. <br />l0. "Quarterly measurement frequency' means samples may be collected at any time during the calendar quarter if a <br />continual discharge occurs. If the discharge is intermittent, then samples shall be collected during the period that <br />discharge Occurs. <br />INDBP a/9/93 <br />