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STATE WATER RESOURCES CONTROL BOARD - 37 - <br /> ORDER <br /> 37 - <br /> ORDER WQ 2014-0153-DWQ <br /> GENERAL WASTE DISCHARGE REQUIREMENTS <br /> FOR SMALL DOMESTIC WASTEWATER TREATMENT SYSTEMS <br /> 5. Definitions <br /> a. Upset means an exceptional incident in which there is unintentional and temporary <br /> noncompliance with effluent limitations because of factors beyond the reasonable <br /> control of the Discharger. An upset does not include noncompliance to the extent <br /> caused by operational error, improperly designed treatment facilities, inadequate <br /> treatment facilities, lack of preventive maintenance, or careless or improper action. <br /> b. The monthly average flow rate is the total discharge by volume during a calendar <br /> month divided by the number of days in the month that the facility was <br /> discharging. This number shall be reported in gpd or million gallons per day. <br /> c. The monthly average concentration is the arithmetic mean of measurements <br /> recorded during a calendar month. If only one sample is collected in a calendar <br /> month, then that sample measurement is the monthly average concentration. <br /> d. The daily maximum concentration is the highest measurement recorded for any <br /> grab or composite sample collected during a day in a calendar month. <br /> e. The 7-day median total coliform organism value shall be calculated as the median <br /> concentration of the results for the last 7 calendar days. If only one sample is <br /> collected within a 7-day period, then that one sample becomes the 7-day median <br /> value. <br /> f. A grab sample is an individual sample collected in less than 15 minutes. <br /> g. Unless otherwise specified, a composite sample is a combination of individual <br /> samples collected over the specified sampling period. The method of compositing <br /> shall be reported with the results. <br /> h. A time-weighted sample is collected at equal time intervals, with a maximum <br /> interval of one hour. <br /> i. A flow-weighted sample is collected at varying time intervals (average interval one <br /> hour or less) so that each sample represents an equal portion of the cumulative <br /> flow. The duration of the sampling period shall be specified in the MRP. <br /> j. A day is the mean solar day of 24 hours beginning at mean midnight. All <br /> references to day in this General Order are calendar days. <br /> September 23, 2014 <br />