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PART I Page 3 of l3 C. FOOTNOTES (continued) b/ TDS shall be sampled on a monthly basis until six samples have boen analyzed. A report of 'No Discharge" shall not be counted as one of the six samples. Thereafter, monitoring shall continue on a quarterly basis. Following submittal of the initial six sets of monthly data, the Division shall deG:rmine whether the permittee is required to submit a report addressing salt removal in accordance with Regulations For Implementation of the Colorado River Salinity Standards Through the NPDES Permit Program, 3.10.0. If the salinity report is required, the Division shall so advise the permittee by letter and the report shall be submitted within 180 days. i/ 'ibis parameter is subject to 'Noncompliance Notification' requirements of Part II.A.3.(b)(v) of this permit. j/ Procedure for determining settleable solids is contained in 40 CFR 434.64. The method detection limit for measuring settleable solids under this part shall be 0.4 ml/1. - k/ Should a precipitation event occur which is greater than the 10-year, 24-hour event, the permittee shall submit rain gauge or other appropriate documentation in order for an exemption to be claimed. In lieu of such documentation, limitations contained in Part I.A.I.(b), shall apply. Documentation shall be reported as an attachment to the Discharge Monitoring Report for the appropriate period. I/ When the most sensitive analytical method which complies with Part I.F.2. of th.e permit has a detection limit greater than or equal to the permit limit, the permittee shall report 'less than the detectable limit," as appropriate. Such reports shall not be considered as violations of the permit limit. The present lowest method detection limits for specific parameters (which have limitations which are, in some cases, less than or equal to the detection limit) are as follows: Total Residual Chlorine 0.05 mg/1 Total Recoverable Cadmium 0.0003 mg/I Total Recoverable Copper 0.005 mg/1 Total Recoverable Lead 0.005 mg/I Total Mercury 0.00025 mg/I Total Recoverable Nickel 0.05 mg/I Total Recoverable Silver 0.0002 mg/I Total Recoverable Zinc 0.05 mg/I Benzene 0.001 mg/I m/ Fecal coliform bacteria average concentrations shall be determined by the geometric mean of all samples collected during a thiRy (30) consecutive day period. The 7 day average shall be determined by the geometric mean of all samples taken during a seven (7) day period. n/ There shall be no acute toxicity in the efFluent from this discharge point. The ae:ute toxicity limitation is exceeded if 1) a statistically significant difference in mortality (at the 9590 confidence level) is observed for either species between the control and any dilution less that or equal to the identified IWC or 2) a species mortality N any dilution of effluent (including 10090 effluent) exceeds 5090.