City of Dardenne Prairie, MO Private Sewage Disposal Code

101.1 Title. These regulations shall be known as the "Private Sewage Disposal Code of the City of Dardenne Prairie, Missouri," hereinafter referred to as "this code."

Section 103 Department Of Private Sewage Disposal Inspection.

103.2 Appointment. The code official shall be appointed as provided by ordinance.

Section 106 Permits.

106.2.1 Construction documents. An application for a permit shall be accompanied by construction documents, as required by the code official, drawn to scale, with sufficient clarity and detail dimensions showing the nature and character of the work to be performed. Specifications shall include pumps and controls, dose volume, elevation differences (vertical lift), pipe friction loss, pump performance curve, pump model and pump manufacturer. The code official is permitted to waive the requirements for filing construction documents where the work involved is of a minor nature. Where the quality of the materials is essential for conformity to this code, specific information shall be given to establish such quality, and this code shall not be cited, or the term "legal" or its equivalent used as a substitute for specific information.

106.2.3 Time limitation of application. An application for a permit for any proposed work shall be deemed to have been abandoned ninety (90) days after the date of filing, unless such application has been pursued in good faith or a permit has been issued; except that the code official shall have the authority to grant one (1) or more extensions of time for additional periods not exceeding ninety (90) days each. The extension shall be requested in writing and justifiable cause demonstrated.

106.2.4 Previous approvals. This code shall not require changes in the construction documents, construction or designated occupancy of a structure for which a lawful permit has been heretofore issued or otherwise lawfully authorized, and the construction of which has been pursued in good faith within ninety (90) days after the effective date of this code and has not been abandoned.

106.2.5 Soil data. Soil test reports shall be submitted indicating soil boring data related to the undisturbed and finished grade elevations, vertical elevation reference point and horizontal reference point. Surface elevations shall be given for all soil borings. Soil reports shall bear the signature of a soil tester.

106.3.4 Extensions. Any permittee holding an unexpired permit shall have the right to apply for an extension of the time within which the permittee will commence work under that permit when work cannot be commenced within the time required by this Section for good and satisfactory reasons. The code official shall extend the time for action by the permittee for a period not exceeding ninety (90) days if there is reasonable cause. No permit shall be extended more than once.

106.5.3 Expiration. All permits for work under the scope of this code shall comply with Section 105.5 Expiration of the Building Code of the City of Dardenne Prairie, Missouri.

106.4.2 Fee schedule. Fees related to administration of this code shall be as set forth elsewhere in this Chapter of the Municipal Code.

106.4.3 Fee refunds. The code official is authorized to establish a refund policy.

Section 107 Inspections And Testing.

107.90 Workmanship. All work shall be executed in a workmanlike and skilled manner so that, for example, floors are level, walls are plumb and square, windows and doors are plumb, square and easily operable, exterior building envelopes are weathertight and exclude the elements, building materials are undamaged, and surfaces are unmarred. All work performed shall be in compliance with this code, per industry standards, and in accordance with the manufacturer's installation instructions.

Section 108 Violations.

108.4 Violation penalties. Delete in its entirety.

108.5 Stop-work orders. Upon notice from the code official, work on any private sewage disposal system that is being performed contrary to the provisions of this code or in a dangerous or unsafe manner shall immediately cease. Such notice shall be in writing and shall be given to the owner of the property, to the owner's authorized agent or to the person performing the work. The notice shall state the conditions under which work is authorized to resume. Where an emergency exists, the code official shall not be required to give a written notice prior to stopping the work. Any person who shall continue any work on the system after having been served with a stop-work order, except such work as that person is directed to perform to remove a violation or unsafe condition, shall be subject to the violations and penalties set forth in Section 500.127 of the Municipal Code.

SECTION 109 MEANS OF APPEALS.

109.1 Application for appeal. For the purposes of this code, all appeals shall be in accordance with the procedure established for the Building Code of the City of Dardenne Prairie, Missouri.

109.2 Membership of board. Delete in its entirety.

109.2.1 Qualifications. Delete in its entirety.

109.2.2 Alternate members. Delete in its entirety.

109.2.3 Chairman. Delete in its entirety.

109.2.4 Disqualification of member. Delete in its entirety.

109.2.5 Secretary. Delete in its entirety.

109.2.6 Compensation of members. Delete in its entirety.

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109.3 Notice of meeting. Delete in its entirety.

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109.4 Open hearing. Delete in its entirety.

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109.4.1 Procedure. Delete in its entirety.

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109.5 Postponed hearing. Delete in its entirety.

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109.6 Board decision. Delete in its entirety.

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109.6.1 Resolution. Delete in its entirety.

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109.6.2 Administration. Delete in its entirety.

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109.7 Court review. Delete in its entirety.

Chapter 3 General Regulations.

Section 302 Specific Limitations.

302.6 Water softener and iron filter backwash. Water softener or iron filter discharge shall be diverted away from a septic system, provided a nuisance is not created.

Chapter 4 Site Evaluation And Requirements.

Section 403 Soil Borings And Evaluation.

403.1 Soil borings and profile descriptions. Soil borings shall be conducted on all sites, regardless of the type of private sewage system planned to serve the parcel. Borings shall extend at least three (3) feet (914 mm) below the bottom of the proposed system. Borings shall be of sufficient size and extent to determine the soil characteristics important to an on-site liquid waste disposal system. Borehole data shall be used to determine the suitability of soils at the site with respect to zones of seasonal or permanent soil saturation and the depth to bedrock.

The use of power augers for soil borings is prohibited. Soil borings shall be conducted and reported in accordance with Sections 403.1.1 through 403.1.5. Where it is not practical to have borings made with a backhoe, such borings shall be augered or dug by hand.

403.1.1 Number. There shall be not less than two (2) borings per soil absorption site. Where necessary, more soil borings shall be made for an accurate evaluation of a site. Borings shall be constructed to a depth of not less than three (3) feet (914 mm) below the proposed depth of the system.

Exception: Three (3) borings are required for repairs of existing private sewage disposal systems, along with one (1) backhoe excavation at a five-foot depth.

Section 403 Soil Borings And Evaluation.

404.1 General. The permeability of the soil in the proposed absorption system shall be determined by permeability evaluation.

404.2 Percolation tests and procedures. Delete in its entirety.

404.2.1 Percolation test hole. Delete in its entirety.

404.2.3 Test procedure, other soils. Delete in its entirety.

404.2.4 Mechanical test equipment. Delete in its entirety.

Section 406.

Table 406.1 Minimum Horizontal Separation Distances for Soil Absorption Systems

Element	Distance (feet)
Cistern	50
Habitable building, below-grade foundation	25
Habitable building, slab-on-grade	15
Lake, high-water mark	50
Lot line (for new construction)	30
Lot line (for repairs)	10
Reservoir	50
Roadway ditches	10
Spring	100
Streams or watercourse^a	50
Swimming pool	15
Uninhabited building	10
Water main	50
Water service	10
Water well	100

For SI: 1 foot = 304.8 mm.

NOTES:
a.	All natural watercourses depicted on the most current United States Geological Survey (U.S.G.S) 7.5 Minute Series (Topographic) Maps for St. Charles County, Missouri, shall be left in their natural state.

406.3 Percolation rate, trench or bed. Delete in its entirety.

406.4 Percolation rate, seepage pit. Delete in its entirety.

Chapter 5 Materials.

Section 501 General.

501.2 Minimum standards. Materials shall conform to the standards referenced in this code for the construction, installation, alteration or repair of private sewage disposal systems or parts thereof. All new construction requires N.S.F. Class 1 tanks, unless otherwise determined by the Code Official.

Exception: The extension, addition to or relocation of existing pipes with materials of like grade or quality in accordance with Sections 102.6 and 105.

Section 504 Tanks.

504.3 Steel tanks. Delete in its entirety.

504.5 Manholes. Manhole collars and extensions shall be of the same material as the tank. Manhole covers shall be of concrete or other approved material.

Chapter 6 Soil Absorption Systems.

Section 602 Sizing Soil Absorption Systems.

602.1 General. Effluent from septic tanks and other approved treatment tanks shall be disposed of by soil absorption or an approved manner. Sizing shall be in accordance with this Chapter for systems with a daily effluent application of three thousand (3,000) gallons (11,356 925 L) or less. Two (2) systems of equal size shall be required for systems receiving effluents exceeding three thousand (3,000) gallons (11,356 L) per day. Each system shall have a minimum capacity of seventy-five percent (75%) of the area required for a single system. An approved means of alternating waste application shall be provided. A dual system shall be considered as one (1) system.

Section 603 Residential Sizing.

603.1 General. All absorption fields shall be designed based on soil morphology revaluation reports prepared by a certified professional soil scientist or by a professional engineer licensed by the State of Missouri.

Delete Table 603.1.

Section 604 Other Building Sizing.

604.1 General. Calculations to determine the size of absorption field shall be based upon sewage flow rates in Table 2A and soil groups in Tables 13 and 14 in 19 CSR 20-3.060 as currently promulgated or as amended hereafter and as provided in that rule.

Delete Table 604.1(1).

Delete Table 604.1(2).

604.2 Drain Field Calculations, rounding. Calculation for the length of the drain field shall be rounded up to the next one hundred (100) lineal feet.

Chapter 7 Pressure Distribution Systems.

Section 706 Dosing.

706.1 General. The dosing frequency shall be not greater than four (4) times daily. A volume per dose shall be established by dividing the daily wastewater flow by the dosing frequency. The dosing volume shall be not less than ten (10) times the capacity of the distribution pipe volume. Table 706.1 provides the estimated volume for various pipe diameters.

Table 706.1 Estimated Volume for Various Diameter Pipes
Diameter (inches)	Volume (gallons per foot length)
1	0.041
1-1/4	0.064
1-1/2	0.092
2	0.164
3	0.368
4	0.655
5	1.47

For any septic system that requires dosing, the pump tank shall be a one-thousand-gallon, concrete, single-compartment tank equipped with effluent pump with float and high-water alarm. A timer shall dose over a twenty-four-hour period, instead of on demand.

Chapter 8 Tanks.

Section 802 Septic Tanks And Other Treatment Tanks.

802.1 General. Septic tanks shall be fabricated or constructed of monolithic concrete, fiberglass or an approved material. Tanks shall be watertight and fabricated to constitute an individual structure, and shall be designed and constructed to withstand anticipated loads. The design of prefabricated septic tanks shall be approved. Plans for site-constructed concrete tanks shall be approved prior to construction.

802.2 Design of septic tanks. Septic tanks shall conform to the design standards set out in 19 CSR 20-3.060(4), as currently promulgated or as amended hereafter.

802.7.1 Sizing of tank. The minimum liquid capacity for one- and two-family dwellings shall be in accordance with Table 802.7.1.

Table 802.7.1 Septic Tank Capacity for One- and Two-Family Dwellings.

Number of Bedrooms	Septic Tank (gallons)
1	1,000
2	1,000
3	1,000
4	1,250
5	1,500

For SI: 1 gallon = 3.785 L.

Exception:

Six (6) bedrooms or more requires one-thousand-gallon trash tank in front of Class 1.

802.7.2 Other buildings. For buildings, the liquid capacity shall be increased above the seven-hundred-fifty-gallon (2839 L) minimum as established in Table 802.7.1. In buildings with kitchen or laundry waste, the tank capacity shall be increased to receive the anticipated volume for a twenty-four-hour period from the kitchen or laundry or both. The liquid capacities established in Table 2A "Quantities of Domestic Sewage Flows" in Section B 19 CSR 20-3.060 do not include employees.

Exception: One- or two-family dwellings.

Table 802.7.2 Additional capacity for other buildings. Delete in its entirety.

802.8 Installation. Septic and other treatment tanks shall be located with a horizontal distance not less than as specified in Table 1 "Minimum Setback Distances" in 19 CSR 20-3.060(4), as currently promulgated or as amended hereafter, except that for new construction: (a) sewage tanks shall be one hundred (100) feet from any private water supply, and (b) both sewage tanks and absorption fields (disposal areas) shall be thirty (30) feet from any property line. Tanks installed in groundwater shall be securely anchored. A three-inch-thick (76 mm) compacted bedding shall be provided for all septic and other treatment tank installations. The bedding material shall be sand, gravel, granite, limerock or other non-corrosive materials of such size that the material passes through a five-tenths-inch (12.7 mm) screen.

Table 802.8 Minimum horizontal separation distances for treatment tanks. Delete in its entirety.

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802.11.1 Capacity sizing. The working capacity of the dosing or pumping chamber shall be sized to permit automatic discharge of the total daily sewage flow with discharge occurring not more than four (4) times per twenty-four (24) hours. Minimum capacity of a dosing chamber shall be one thousand (1,000) gallons (3790 L), and a space shall be provided between the bottom of the pump and floor of the dosing or pumping chamber. A dosing chamber shall have a one-day holding capacity located above the high-water alarm for one- and two-family dwellings based on one hundred twenty (120) gallons (455 L) per day per bedroom or, in the case of other buildings, in accordance with Section 802.7. For one- and two-family dwellings, pump chambers shall at a minimum be one-thousand-gallon, single-compartment, time-dosed tanks.

Where the total developed length of distribution piping exceeds one thousand (1,000) feet (305 m), the dosing or pumping chamber shall have two (2) siphons or pumps dosing alternately and serving one-half (1/2) of the soil absorption system.

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Table 802.11.1 Pump chamber sizes. Delete in its entirety.

Ch. 9.

Section 903.

Table 903.1(3) Design criteria for a three-bedroom home for a mound on a zero- to six-percent slope with loading rates of four hundred fifty (450) gallons per day for slowly permeable soil. Delete in its entirety.

Table 903.1(4) Design criteria for a four-bedroom home for a mound on a zero- to six-percent slope with loading rates of six hundred (600) gallons per day for slowly permeable soil. Delete in its entirety.

Table 903.1(5) Design criteria for a one-bedroom home for a mound on a zero- to twelve-percent slope with loading rates of one hundred fifty (150) gallons per day for shallow permeable soil over creviced bedrock. Delete in its entirety.

Table 903.1(6) Design criteria for a two-bedroom home for a mound on a zero- to twelve-percent slope with loading rates of three hundred (300) gallons per day for shallow permeable soil over creviced bedrock. Delete in its entirety.

Table 903.1(7) Design criteria for a three-bedroom home for a mound on a zero- to twelve-percent slope with loading rates of four hundred fifty (450) gallons per day for shallow permeable soil over creviced bedrock. Delete in its entirety.

Table 903.1(8) Design criteria for a four-bedroom home for a mound on a zero- to twelve-percent slope with loading rates of six hundred (600) gallons per day for shallow permeable soil over creviced bedrock. Delete in its entirety.

Table 903.1(9) Design criteria for a one-bedroom home for a mound on a zero- to twelve-percent slope with loading rates of one hundred fifty (150) gallons per day for permeable soil with a high-water table. Delete in its entirety.