Agenda - 03-20-2001-9c - Laserfiche WebLink

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z MEMORANDUM TO: Craig Benedict, Planning Director COPIES: Phil Post, PE FROM: Paul Thames, PE, County Engineer DATE: July 26, 2000 SUBJECT: Sewer service from the Efland sewer system for the Ashwick Subdivision in Efland As per the request of Phil Post, PE, president and owner of Philip Post & Associates and consulting engineer for the above referenced subdivision, I am providing the following information and input relative to sewer availability at the Ashwick subdivision site. The southern portion of site, as shown on the site and utility plans date M4/2000, is crossed by two branches of the sewer interceptor/outfall lines of the Efland sewer system. These lines may not be tapped for individual sewer services. However, new collector mains may be extended from existing manholes through the parcel to provide sewer service to individual lots. Furthermore, it may be passible in limited circumstances to connect individual service lines to existing manholes, although I discourage this practice and would allow this to occur only when other alternatives and connections are not practicable. The Post & Associates sewer utility site plan appears have followed the above criteria fairly closely. The site plan appears to show that sewer service will be provided via new gravity collector lines extended from existing manholes. The plan does not show any proposed sewer pumping/lift stations which, as you are aware, would be at least somewhat problematic. There is or may ultimately be a minor final sewer design issue as to how service is extended to lots 8, 9 and 21, as these lots do not appeaz to front on the proposed collector lines. However, please be advised. that, at this time and without sewer profile plans, I cannot verify or certify that the gravity sewer layout that is shown is actually a workable plan. In conclusion, I can state that: 1) the Efland sewer system can accommodate the sewer flow that can be projected from a 50 to 60 lot subdivision; 2) the proposed sewer layout appears to conform to standard and acceptable engineering practice far gravity sanitary sewer layout; 3) nothing shown on the plans, as far as sewer layout is concerned, appears to be unacceptable in terms of general County or Efland sewer policies and practices; and 4) subject to all final design and state permitting requirements and approvals related to layout, materials, construction and construction oversight practices, etc., and unless there is a significant flaw in the proposed collector layout, sewer service can be extended to the property as long as all County relative zoning, subdivision, land use, watershed, density, etc., ordinances and policies are satisfied.