Laserfiche WebLink
P <br />PART I <br />Page 4 of 19 <br />' C. FOOTNOTES (continued) <br />I/ When the most sensitive analytical method which complies with Part I.F.2. of the permit has a detection limit <br />greater than or equal to the permit limit, the permittee shall report "less than (the detectable limit),' as <br />appropriate. Such reports shall not be considered as violations of the permit limit. <br />The present lowest method detection limits for specific parameters (which have limitations which are, in some <br />cases, less than or equal to the detection limit) are as follows: <br />Total Residual Chlorine 0.05 mg/P <br />Cadmium• 0.0003 mg/[ <br />Copper+ 0.005 mg/P <br />Lead+ 0.005 mglP <br />Total Mercury 0.00025 mg/l <br />Nickel* 0.05 mglP <br />Silver+ 0.0002 mg/P <br />Zinc+ 0.05 mg/P <br />Benzene 0.005 mg/P <br />These limits apply to the total recoverable or the potentially dissolved fraction of metals. <br />m/ For fecal coliform bacteria concentrations, the thirty (30) day and seven ('7) day averages shall be determined as <br />explained in footnotes a/ and b/ above, respectively, except that the geometric mean shall be used instead of the <br />arithmetic mean. <br />The geometric mean may be calculated using two different methods. For the methods shown, a, b, c, d, etc. are <br />individual sample results, and n is the total number of samples. <br />Method I: <br />p rel <br />Geometric Mean = (a+b*c+d*...) "+" -means multiply <br />Method 2: <br />Geometric Mean = antilog ([log(a)+log(b)+log(c)+log(d)+...j/n) <br />Graphical methods, even though they may also employ the use of logarithms, may introduce significant error and <br />may not be used. <br />In calculating the geometric mean, for those individual sample results that are reported by the analytical laboratory <br />to be "less than" a numeric value, the numeric value shall be used in the calculations unless the result is "less than <br />2.2". If the result is "less than 2.2", use a value of l in the calculations. If all individual analytical results for the <br />month are reported to be less than numeric values, then report "less than" the largest of those numeric values on <br />the monthly DMR. Otherwise, report the calculated value. <br />Amendment No. 4lssued 05/11/93 Effutive 07/01/93 <br />