Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 11 - DESIGN AND CONSTRUCTION STANDARDS FOR SEWERAGE SYSTEMS, TREATMENT WORKS, DISPOSAL SYSTEMS OR OTHER FACILITIES CAPABLE OF CAUSING OR CONTRIBUTING TO POLLUTION AND MOBILE HOME PARK AND CAMPGROUND SEWERAGE AND PUBLIC WATER SUPPLY DISTRIBUTION SYSTEMS › Part B - MUNICIPAL AND DOMESTIC SEWERAGE SYSTEMS, TREATMENT WORKS, AND DISPOSAL SYSTEM › Section 11-9 - Design of Sewers

Current through July 13, 2024
(a) Separate
				  sewers. Separate sewers shall be provided for collection of stormwater and
				  wastewater. Roof, areaway, drive or foundation drains shall not be connected to
				  sanitary sewers.
(b) Pipe
				  materials.
(i) Wastewater characteristics.
				  Pipe materials shall resist acid and alkaline solutions, organic solvents, and
				  other wastewater constituents and environmental conditions
				  encountered.
(ii) Pipe loadings.
				  Pipe materials shall be chosen and the pipeline shall be designed to withstand
				  all trench and superimposed surface live loads with a minimum factor of safety.
				  Rigid pipes shall have a minimum factor of safety of 1.5, and flexible pipes
				  shall have a minimum factor of safety of 1.25.
(iii) Soil characteristics. Pipe materials
				  shall be chosen to resist corrosion due to aggressive soil characteristics by
				  the soil it contacts. Iron or steel pipe shall be protected from corrosion with
				  polyethylene encasement or cathodic protection.
(iv) Joints. Pipe joints shall be flexible,
				  durable and designed to minimize infiltration/exfiltration and exclude
				  roots.
(v) Performance tests.
				  Piping shall be subjected to leakage tests. Leakage tests shall be
				  infiltration, exfiltration, or air tests.
(A)
				  Infiltration. Maximum of 200 gallons per inch diameter per mile per day (1200
				  liters/cm/km/day) with a minimum of two feet (0.6 m) of head over the top of
				  the pipe.
(B) Exfiltration. Maximum
				  of 200 gallons per inch diameter per mile per day (1200 liters/cm/km/day) with
				  a minimum of two feet (0.6 m) of head over the top of the pipe.
(C) Air. Air tests shall conform to ASTM
				  C-828-80. (D) Deflection. Maximum five percent deflection after flexible pipe
				  is backfilled for thirty (30) days. A mandrel of 95 percent of pipe diameter
				  shall be used. No mechanical pulling of mandrel is permitted.
(vi) Approved pipe material
				  specifications. Type of commercial pipe approved for gravity sanitary systems
				  include:
(A) Extra strength and standard
				  strength vitrified clay pipe: ASTM C700-78a.
(B) PVC sewer pipe and fittings: ASTM
				  D3034-80, SDR35, ASTM F679-81, or ASTM F794-83.
(C) ABS composite sewer pipe: ASTM
				  D2680-80.
(D) Reinforced plastic
				  mortar pipe: ASTM D3262-81.
(E)
				  Asbestos cement nonpressure sewer pipe: ASTM C428-80.
(F) Reinforced concrete sewer pipe: ASTM
				  C76-82.
(G) Concrete Sewer Pipe:
				  ASTM C-14.
(H) Ductile iron sewer
				  pipe: ASTM A746-77.
Types of commercial pipe approved for pressure sanitary
					 sewer systems include:
(I)
				  PVC water pipe: ASTM D2241-80, or AWWA C900.
(J) Asbestos cement pressure pipe: AWWA
				  C400-80.
(K) Ductile iron pipe:
				  AWWA C151-81.
(L) Glass
				  Fiber-Reinforced Thermo-setting-Resin Pressure Pipe: AWWA C950-81.