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WASTE DISCHARGE REQUIRdTS • SIMPSON PAPER COMPANY, POiJ MILL is SAN JOAQUIN COUNTY 5. When effluent limitations and guidelines are promulguted under Section 301 and 304 of the Federal Water Pollution Control Act, as amended, for existing sources to be achieved by the application of best available technology economically achievable, and if such limitations and guidelines are more stringent than any limitation contained in this order, the Re- gional Board shall revise or modify this order accordingly after due notice to the discharger. 6. This Order expires on 30 September 1980 and the Simpson Paper Company must file a Report of Waste Discharge in accordance with Title 23, California Administrative Code, not later than 180 days in advance of such date as application for issuance of new waste discharge requirements. 7. In the event of any change in control or ownership of land or waste dis- charge facilities presently owned or controlled by the discharger, the discharger shall notify the succeeding owner or operator of the existence of this Order by letter, a copy of which shall be forwarded to this office. 8. The daily discharge rate is obtained from the following calculation for any calendar day: Daily Discharge rate = 8.34 1N Qi Ci N 1 in which N is the number of samples analyzed in any calendar day. Qi and Ci are the flow rate (MGD) and the constituent concentration (mg/1) respectively, which are associated with each of the N grab samples which may be taken in any calendar day'. If a composite sample is taken Ci is the concentration measured in the composite sample, and Qi is the average flow rate occurring during the period over which samples are composited. The 30-day average discharge rate shall be the arithmetic average of all the values of daily discharge rate calculated during any 30 consecutive calendar day period. If a discharge occurs on only 7 days or less during a 30 consecutive calendar day period, compliance with the 30-day average discharge rate limitation shall not be determined. The annual average discharge rate shall be running average calculated by totaling the daily discharge rates for the preceeding 12 month period and dividing by the number of operating days during that period. The daily maximum concentration shall be determined from the analytical results of any sample, whether discrete or composite. I, JAMES A. ROBERTSON, Executive Officer, do hereby certify the foregoing is a full, true, and correct copy of an order adopted by the California Regional Water Quality Control Board, Central Valley Region, on LFN/ap 11/15/77 JAMES A. ROBERTSON, Executive Officer - 5 -