Each homeowner provides on-site wastewater treatment contained within their property boundary. The water supply is provided by private individual wells throughout the Development.
The Lake Tishomingo Property Owners Association have proposed that a central collection and wastewater treatment facility be evaluated. The central system should provide collection and treatment for the existing permanent and part time residents along with expansion capabilities for future development for existing lots presently vacant.
ESTIMATED BREAKDOWN OF LOT OWNERSHIP NO. OF LOTS VACANCY ========================== =========== ========= 46 - 4 lot or more Owners = 218 lots 80 vacant 74 - 3 lot Owners = 222 lots 50 vacant 142 - 2 lot Owners = 284 lots 100 vacant 186 - 1 lot Owners = 186 lots 170 vacant ========== ========== TOTAL = 910 lots 400 vacant
Therefore, the approximately 400 vacant lots have the potential of regrouping as building sites containing two or three lots each. The regrouping of vacant lots could provide approximately 174 new building sites. The wastewater collection and treatment facility should be constructed in phases to accommodate the maximum potential.
In addition to the future building sites, there are approximately 50 homes along Tishomingo Road and Hillsboro House Springs Road that could ultimately be served by this development. The growth potential along these routes could also double to be an equivalent of 100 homes.
The ultimate design flow should be estimated for 500 homes as outlined:
Permanent Residents = 142 homes Part-time Residents = 84 Vacant lot potential = 174 Off-site connections = 100 === TOTAL DESIGN CAPACITY = 500 homes
The existing individual homes are served by on-site aeration or septic tanks followed by a soil absorption system. The recommended collection improvements consist of an effluent pressure collection system. A force main is proposed around the perimeter of the lake to discharge at the proposed treatment facility at the lake discharge. Existing on-site systems would be easily converted to continue treatment by the aerator or septic tank with a pump being added to discharge into the common force main. Therefore, all existing soil absorption fields could be eliminated with all effluent being discharged to a central treatment facility for ultimate treatment and discharge.
The recommended treatment facility consists of a recirculating sand filter complete with dosing chambers, sand filter beds and chlorination facilities. The components of the facility can be constructed in phases to serve approximately 125 homes per phase. This would allow for treatment of existing homes that are likely to connect and provide for expansion as the area develops. Construction of filter beds and dosing chambers could be in four (4) phases. The wastewater treatment facility to serve 500 homes as estimated would consist of four (4) filter beds complete with a dosing chamber.
ESTIMATED ESTIMATED COST WITH CONTINGENCIES COLLECTION SYSTEM 24,000 lin. ft. 4" PVC Pipe @ $ 9.00 per ft. = 216,000 230,000 8,000 lin. ft. 2" PVC Pipe @ $ 6.00 per ft. = 48,000 55,000 Subtotal Collection System = 264,000 TREATMENT FACILITY (FOR FIRST 125 HOMES) Dosing Chamber complete with pumps = 30,000 Sand Filter (Approx. 100 ft. square) = 40,000 Chlorination facility = 10,000 Piping and fencing = 20,000 Subtotal Treatment Facility = 100,000 105,000 UPGRADE TREATMENT FACILITY (FOR NEXT 125 HOMES) Sand Filter (Approx. 100 ft. square) = 40,000 50,000 Aerial Mapping and Topographic map = 10,000 10,000 Design Engineering and plan preparation = 35,000 35,000 Project Contingencies (Approx. 8%) = 36,000 TOTAL PROJECT = 485,000 485,000
Submit Engineering Report: December 1997 Receive DNR Approval of Report: March 1998 Submit Improvement Plans to DNR: December 1998 Receive DNR Approval of Plans: March 1999 Construct 4" Pipeline and Treatment Plant: December 1999 Construct 2" Pipeline: December 2000 Upgrade Treatment Plant: December 2002
The attached flow chart outlines the sequence of construction and borrowed funds. The flow chart also outlines anticipated revenue that could be received from connection tap fees and monthly user fees. It is estimated that connections to the sewage system would be at a rate of 50 homes per year. The recommended financing plan allows for the assessment to be collected for only a five year period. The repayment of borrowed funds should be retired within an eight (8) year period as connection and user fees are used to retire the debt.
The flow chart allows for the 4" pipeline and sewage treatment plant to be constructed and placed in service by December of 1999. Connection tap fees and user fees could then generate revenue starting with the year 2000. The completion of the 2" pipeline can be during the year 2000 since many of the potential connections will be along the 4" pipeline. The sewage treatment facility should not require an upgrade until the year 2002 or more than 125 connections are made. If individual homeowners connect to the facility at a greater than 50 per year, the debt retirement and need to upgrade the sewage treatment plant could be accelerated.
The proposed connection tap fee is recommended to be $950.00 with $700.00 to be used for debt retirement
of the capital improvements. The monthly sewer usage charge is recommended at $25.00 with $12.50 used
for debt retirement.
In response to your phone call on October 23, I am sending you copies of our guides on sewer system financing and organization. Also, included are pamphlets about alternative collection and treatment systems, and articles and booklets about self-help, and selection of engineers.
In order for a community to receive government sponsored funding assistance for a communitybased wastewater system, they must be organized as a municipal entity. This can be accomplished by forming a sewer district, amending a water district's decree of incorporation to include sewers, or by forming a Neighborhood Improvement District of the county. The guides give the details of forming these entities.
The three major sources of funding for public wastewater projects are the Missouri Department of Natural Resources, The Missouri Department of Economic Development, and the U. S. Department of Agriculture Rural Development. The enclosed article "Environmental Project Financing" gives details of these programs.
Please review this information. If you have any questions, or if you would like for us to attend a community meeting, give me a call at (800) 361-4827 or (573) 526-6849.
TECHNICAL ASSISTANCE PROGRAM
Cynthia M. Smith
Management Analysis Specialist
Technical Assistance Program
Dept of Natural Resources
Division of Environmental Quality
PO Box 176
Jefferson City MO 65102-0176