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<br />f <br />COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br />Rationale - Page 5. Permit No. CO-0039560 <br />DISCUSSION: (CONTINUED) <br />E. Change in 30 Day Average Limitation <br />The definition of the 30 day average limitation has changed. In the past <br />it was necessary to have 3 samples in a 30 day period in order to <br />demonstrate compliance or noncompliance with a 30 day average limitation. <br />The new definition, which satisfies 40 CFR 122.2 and Section 10.1.0 of 5 <br />CCR 1002-3, represents an arithmetic mean of all samples collected in a <br />30 day period. The arithmetic mean is calculated as the sum of all <br />samples measured during the month divided by the number of samples <br />measured during the month. The significance of this is that if only one <br />sample is collected during a month the results must satisfy the 30 day <br />average limitation or the permit is violated. If the initial result is <br />high, the permittee is encouraged to perform additional sampling in an <br />effort to lower the arithmetic mean, but the monthly average reported <br />must be based on all sampling results, and must utilize all additional <br />data regardless of the result. <br />F. Additional Monitoring <br />During the application process, the permittee did not have any discharge <br />to sample for the testing requirements. Therefore, the permittee will be <br />required to perform additional monitorng during the next instance of <br />discharge, in order to determine the existence of any pollutants not <br />previously covered. See Part I.B.3 of the permit. <br />G. Compliance Dates <br />The following are specific compliance items which require permittee <br />action: <br />Office Code Event Permit Citation Due Date <br />90508 Materials Containment Plan <br />Update <br />90608 One Time Analysis <br />Part I.E 90 days after <br />effective date <br />of permit <br />Part I. B.3 First discharge <br />Kathryn Dolan <br />December 29. 1987 <br />