Loading...
HomeMy WebLinkAboutPTEV PUD L-1 Utilities PlanPort Townsend EcoVillage Revised Water and Wastewater Utilities Plan Date 6/15/09 NOTE: The PUD application presented in December of 2008 included several ideas that have subsequently been revised after negotiations with the City of Port Townsend: Exhibit #2 p. 5 showed water looping with 2 taps serving several cottage clusters. Since this will not been allowed, it has been changed and sewer line locations have also been revised. Exhibit #7 showed a septic system and a drain field that will now be abandoned and the cottage served will be connected to the city sewer line. Matrix table #1 in the PUD summary restricted cottage clusters to only 4-6 dwelling units and limited meter sizes to only ¾”. Although this will be true for the first cluster we plan to build this fall, we wish to have the flexibility to change the distribution plan and meter sizes over time as explained below. A. POTABLE WATER Background According to the October 2005 issue of American City and County, Americans use 100 gallons of water per ?per capita per day for household use. We humans will need to learn to use less new potable water as it becomes an increasingly scarce resource due to the increasing demand from population growth and the decreasing supply due to global climate changes. We average less than 27 gallons per person per day at the EcoVillage. Our utility plan is meant to help conserve water and keep our EcoVillage relatively affordable by having an efficient water distribution plan, limiting the number of fixtures permitted per resident, having laundry facilities in one location, avoiding lawns that require watering, sharing water taps, collecting rain water, and reusing water in a variety of ways. Water Distribution Plan Our PUD Site Plan limits the maximum number of dwelling units and the maximum footprint of buildings, but allows flexibility in terms of exact location and phasing of construction. We therefore do not know exactly how many dwelling units will be in each housing cluster. We plan to limit the number of plumbing fixtures allowed in the average cottage to up to 9 Fixture Units and the following number of fixtures as defined in the 2006 Uniform Plumbing Code (UPC): FIXTURES FIXTURE UNITS Kitchen sink 1.5 Bathroom group 5.0 for toilet, sink and tub/shower. Hose bib or Laundry sink 2.5 for hose bib or 1.5 for Laundry sink. Houses will be built over time, but not necessarily simultaneously with other houses in a cluster. With each building permit we will detail the water distribution plan for that dwelling and for that cluster with the number of fixture units to be served and the line distances required. The attached Water Utility Site Plan shows one potential way that the water system might meet our needs. We would like to retain the flexibility to present alternative distribution plans if better ones evolve from experience during the coming years and retain the option to upgrade any ¾” meters to 1” meters if it proves to be necessary. Potential Water Distribution System, existing water meters Meter #1 This existing ¾” meter on 35thMeter #2 This existing ¾” meter on 37 Street adequately serves the existing large house and the cottage in the woods, both on the south parcel. No changes are planned unless the future Clubhouse can be added, at which time details will be presented. thMeter #3 This existing ¾” meter on 35 Street adequately serves the existing cottage on the north parcel and will also serve 3 additional new cottages, a guest house and a new common laundry facility. We will show the detailed system when the permits are requested for these new structures. th Street is currently an unused agricultural tap, and will be converted to a residential tap with a 1¼” water line to serve the cluster of 4 dwelling units numbered 4, 5, 6 and 7/8 on the Site Plan. The construction for these cottages will begin this fall. When the first permits are requested we will present a more detailed water distribution line that shows the 300 foot run and how the 39 permitted water fixtures will be distributed. Potential Water Distribution System, future water meters (They are not numbered in the order they will be developed and we will present detailed plans with the permit requests.) Meters #4 This future ¾” meter on 35th Street could serve the first 4-6 cottages constructed along 35thMeter #5 This future ¾” meter on 35 Street, and could then be converted as needed to a 1” meter to serve the remaining 8-12 cottages. th Street would be used to serve the common Clubhouse as well as the 4 cottages to the west of the Clubhouse. Before it is installed, we will make a request to the City to have it designated for remote reading and placed on the water loop connecting the main lines on 35th and 37thMeter #6 This future ¾” meter on 37 Streets. th Street will provide water to the Learning Center and Farm Stand if they can not be served by a line running down from existing meter #2. Table showing potential system with meter #, potential dwelling units served, size of water line, length of the run and the number of fixtures allowed as per table 6-6, p. 109 of the 2006 UPC. Water meters ¾” Max# of DUs H2O line size Length of run Max fixture units #1 (existing) 2 (no change planned) #2 (existing) 4+Laundry 1¼” <200’ 39 #3 (existing Ag.) 4-5 1¼” <300’ 39 #4 (new) 4-12 1” <100’ 39 #5 (new) 4+Clubhouse 1¼” <400’ 34 #6 (new) Learning Center 1” <100’ 39 B. WASTEWATER General We will connect dwelling units to the city sewer and obtain permits for composting toilets as needed. The current sewer line in city tax lot #34 ends at the high point of the property and will not be extended to the west. An additional manhole will be installed in the line if found to be necessary by engineering. We will use a variety of composting toilets throughout the property. If a dwelling unit has a composting toilet, we would like to have it serve as the only toilet in the dwelling unit, without need for a flush toilet. We will develop some systems whereby grey water can be used to flush some of the flush toilets. Specific systems will be presented at the time of permit applications. We would like to retain the flexibility to present alternative distribution plans if better ones evolve experience during the coming years. In general, we will compost human waste when possible and financially feasible and limit the use of potable water for flushing toilets. Potential Wastewater Distribution Plan, existing lines Line #1 The existing large house #2 is already connected to the city sewer and this line may also be used for the Clughouse. Line #2 The existing cottage #3 on the north parcel is connected to the city sewer and this line might serve for dwelling unit #27 as well. Potential Wastewater Distribution Plan, future lines (Not numbered in any particular time sequence) Line #3 The cottage #1 in the woods will be connected to the city sewer line with a pump system. Line #4 The 4-5 dwelling (#s 4-8) units will be connected by gravity feed to the sewer line. Line #5 The cottages near 35thLine #6 Dwelling units #s 21-24 below the city sewer line will also have wastewater pumped to the sewer. Street (#s 9-20) and perhaps the Clubhouse will be connected via one, gravity feed line, with the best size and exact location still to be determined by detailed engineering. Line #7 Dwelling units #25 and #26, and the new common Laundry will be connected together as one new line.