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4 . 10 A grease receptor shall be required whenever any commercial <br /> food establishment is connected to the plant or any activity <br /> which produces a grease content over and above the normal <br /> grease content found in domestic sewage . Grease receptors <br /> shall be required as an addition to a sewage disposal plant <br /> if it is determined from the analysis of the sewage influent <br /> or effluent that, elevated grease levels prevail . <br /> 4. 11 A grease receptor must be installed in front of the wet well <br /> (head works) to effectively screen out floating and <br /> suspended grease produced by commercial food operations . <br /> The grease receptor must be of sufficient size to retain the <br /> grease laden sewage for a period suitable to remove the <br /> grease. <br /> 4 . 12 An open polishing pond shall be installed between the plant <br /> and the subsurface disposal field. This pond must be <br /> segmented by a series of redwood baffles and a weir must be <br /> installed so as to screen out the suspended flocculent <br /> material remaining prior to flowing into the subsurface <br /> disposal field . <br /> 4 . 13 Monthly monitoring by a certified sewage plant operator is <br /> required. Analyses required may include Biochemical Oxygen <br /> Demands , Dissolved Oxygen and settleable solids of plant <br /> influents and effluents and at such other points on stream <br /> as may be necessary. * Average daily flows and peak flows <br /> after plant is in operation are to be determined by a <br /> reliable method . Copies of these analyses and operational <br /> records shall be furnished to the Director of Environmental <br /> Health and the Central Valley Regional Water Quality Control <br /> Board. <br /> 4 . 14 An auxiliary electrical power supply shall be. available for <br /> the contint—d operation of the package sewage treatment <br /> plant. Portable power supply may be used if made available <br /> within a reasonable period of time in the event of a <br /> failure. <br /> 4 . 15 All plumbing fixtures must be of a low flow , energy <br /> efficient and water-saver type for commercial facilities . <br /> 5 . INDIVIDUAL HOUSEHOLD AEROBIC SEWAGE TREATMENT PLANTS <br /> 5 . 1 . Individual household aerobic sewage treatment systems must <br /> be engineer designed for determination of length of leach <br /> lines or number of pits . Design must be based on <br /> percolation rates for various types of soils and number of <br /> bedrooms to be served . <br /> Analyses shall be -lone utilizing the methods specified in <br /> the most recent edition of "Standard Methods For Examination <br /> of Water and Wastewater" USPHS. <br /> 9 <br />