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PART I <br /> Page 5b of 20 <br /> Permit No. : CO-0000396 <br /> i <br /> iA. TERMS AND OONDITIONS (Continued) <br /> 4c. Footnotes <br /> a/ This limitation shall be' determined by the arithmetic mean of a <br /> minimum of three samples collected in separate calendar weeks during <br /> a 30—day consecutive period with a minimum of 20 days occurring <br /> between the first and last sample days. <br /> b/ This limitation shall be determined by a single properly preserved <br /> sample as required under monitoring requirements—Sample Type. <br /> c/ Monitoring is required only during periods of discharge. If "No <br /> discharge" occurs, this shall be reported at the specified <br /> frequency. (See Part B) <br /> d/ Should a discharge occur due to snowmelt or a rainfall event, <br /> sampling of all parameters shall be done as a minimum at the <br /> beginning and at the end of the discharge. <br /> e/ See definitions, Part B. <br /> f/ When the measurement frequency indicated is quarterly, the samples <br /> shall be collected during March, June, September, and December if a <br /> • continual discharge occurs. If the discharge is intermittant, then <br /> samples shall be collected during the period that discharge occurs. <br /> Salinity shall be measured as Total Dissolved Solids (TDS) or <br /> electrical conductivity where a satisfactory correlation with TDS <br /> has been established to the satisfaction of the Water Quality <br /> Control Division, based on a minimum of five (5) samples. Samples <br /> shall be taken at the permitted discharge point. <br /> h/ Salinity shall be sampled on a monthly basis until six samples have <br /> been analyzed. Thereafter, monitoring shall continue on a quarterly_ <br /> basis. Following submittal of the first six months of data, the <br /> Division shall determine eligibility of a waiver of numeric <br /> limitations based on salt—loading. If a waiver is not granted, the <br /> permittee has an additional six months to submit a report addressing <br /> salt removal in accordance with Regulations 3.10.0-3.10.5 and <br /> Appendix A. <br /> i/ Procedure for determining settleable solids is contained in 40 CFR <br /> 434.64. The method detection limit for measuring settleable solids <br /> under. this part shall be 0.4 mg/l. <br /> Should a precipitation event occur which is greater than the <br /> 10-year, 24—hour event, the permittee shall submit rain gauge or <br /> other appropriate documentation in order for an exemption to be <br /> claimed. In lieu of such documentation, limitations contained in <br /> Part I,A..2 b. , shall apply. Documentation shall be reported as an <br /> attachment to the Discharge Monitoring Report (DMR) for the <br /> appropriate period. <br /> AMENDED <br />