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15'; <br /> MEMORANDUM <br /> TO: David Stancil , Planner II <br /> C;I:1;liir--- <br /> FROM: Paul Thames , County Engineer <br /> DATE: May 3 , 1993 <br /> SUBJECT: CP-3-92 , Amendment to Comprehensive Plan, Berini <br /> Property <br /> In reply to your request for comment regarding the above <br /> referenced subject, I wish to convey my reservations about <br /> the sewer system serving the existing mobile home park. I am <br /> and have been concerned about the adequacy of the portion of <br /> the sewer system serving the park and owned by the Berinis as <br /> I have previously expressed in my memorandum of 9/16/92 to <br /> Marvin Collins and Warren Faircloth. <br /> Residential sewer collection systems generally conform to <br /> design standards requiring the use of eight inch minimum <br /> diameter sewer mains and manholes located at distances of not <br /> greater than four hundred feet apart, at every change of <br /> horizontal and vertical alignment and at points where mains <br /> intersect. The purpose for these design standards is to <br /> insure minimal probability of stoppages in the mains and to <br /> allow ready access to the mains to locate and clear stoppages <br /> if and when they occur. The use of smaller main diameters, <br /> even when the mains will carry the full design flow, <br /> increases the probability of stoppages by enabling smaller <br /> diameter objects to cause stoppages. The use of pipe elbows <br /> and tees to replace manholes also provides increased <br /> opportunity for stoppages while making location and removal <br /> of stoppages more difficult. <br /> The sewer system serving the Berini property was designed in <br /> two discrete sections, each section with different design <br /> criteria and philosophy. The entire private portion of the <br /> sewer system, to be owned by the Berinis and contained solely <br /> within the Berini property, is composed of six inch diameter <br /> sewer main with no manholes utilized to accommodate changes <br /> in horizontal or vertical grade or to provide for the <br /> connection of sewer mains. The public portion of the sewer, <br /> connecting the private system and previously existing portion <br /> of Durham' s sewer system, is owned, operated and maintained <br /> by the City of Durham. The design for this portion of the <br />