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C. F00'INOTES PART I Page 3 of 19 7. A "24 hour composite" sample is a combination of at least eight (8) sample aliquots of at least 100 milliliters, collected at equally spaced intervals during the operating hours of a facility over a twenty-four (24} hour period. For volatile pollutants, aliquots must be combined Sa the laboratory immediately before analysis. The composite suet be floe proportional; either the time interval between each aliquot or the volume of each aliquot must be proportional to either the wastewater or effluent flow at the time of sampling or the total wastewater or effluent flow since the collection of the previous aliquot. Aliquots may be collected manually or automatically. f/ - In the event an oil sheen, or floating oil is observed, a grab sample shall be collected, analyzed, and reported on the appropriate DMR. In addition, corrective action shall be taken immediately to mitigate the discharge of oil and grease. A description of the corrective action taken should be included with the DMR. ~/ - Where based on a minimum of 5 samples, the permittee demonstrates, to the satisfaction of the Water Quality Control Division, that the level of total disaolve3 solids (TDS) is Lhe effluent can be calculaced based upon the level of electrical conductivity, the permittee may measure and report TDS in terms of electrical conductivity. h/ - TDS aha12 be sampled on a monthly basis until aiz samples have been analyzed. A report of "No Discharge" shall not be counted as one of the s1z samples. Thereafter, monitoring shall continue on a quarterly basis. Following submittal of the Saitisl siz seta of monthly data, the Division shall determine 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 eo advise the permittee by letter and the report shall be submitted within 180 days. i/ - This parameter is subject to "Noncompliance Notification" requiremeata of Part II.A.3.(b)(v) of this permit. ~/ - 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 ezemption to be claimed. In lieu of such documentation, limitations contained in Part I.A.1.(b), shall apply. Documentation shall be reported as an attachment to the Discharge Hoaitoring Report for the appropriate period. Code:: i - 16 Date: 1-84, revised 10-88, revised 12-88