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<br />1. Effective Date of Limitations - shall be as soon as possible and <br />practicable, but no later t:Jtan July 1, 1977. <br /> <br />2. Analyses or wastewater discharges for BODS and suspended solids <br />shall be based on one of the following sampling methods: <br /> <br />a. Weekly Average: The arithmetic mean of two or more grab <br />samples collected during seven (7) consecutive days, taken <br />at least three days apart. <br /> <br />b. Monthly Averages: <br /> <br />(1) one 6-hour composite sample, or <br /> <br />(2) the arithmetic mean of three or more grab samples <br />collected during 30 consecutive days, taken at least 7 days <br />apart. <br /> <br />c. For sewage oxidation ponds and polishing ponds, the monthly <br />average sampling/analysis procedure, above, shall apply. <br /> <br />d. In addition to the above effluent limitations, the arithmetic mean <br />of values for effluent collected in a period of 30 consecutive days <br />shall not exceed 15 percent of the arithmetic mean of the values <br />for influent samples collected at approximately the same time <br />during the same per:iod (85% removal). For influent values, <br />the sampling/analysjs procedures listed in subparagraphs (a) <br />and (b), above, apply to all sewage plants regardless of type. <br /> <br />3. The geometric mean of the yalues for a minimum of two samples <br />collected during 7 consecutive days. <br /> <br />4. The geometric mean of the yalues for a minimum of three samples <br />collected during 30 consecutive days. <br /> <br />Collection System <br /> <br />The collection sewer system design should conform to the "Design <br />Criteria for Sewerage Works" published by the Colorado State Department of <br />Health. In this, minimum 8-inch lines are recommended with minimum allowable <br />grades of 0.4 feet of fall in 100 feet. An 8-inch sewer on minimum grades will <br />serve a population equivalent of about 1,200. <br /> <br />An average unit flow for towns similar to Starkville is about 80 gallons <br />per capita per day. Systems are normally designed for maximum instantaneous <br />flows of 5 times the average or 400 gpd. <br /> <br />- 7 - <br />