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(A) New sanitary sewerage facilities shall be designed in accordance with the Arizona Department of Environmental Quality (ADEQ) and the Arizona Department of Health Services Bulletin No. 11 (latest edition). Any deviations from the bulletin’s requirements shall have the written approval of the City of Show Low.

(B) New sanitary sewers shall be designed to carry the designated peak wet weather flow from the area that will be ultimately tributary to the respective reach of the sewer.

(C) No public gravity sewer lines shall be less than eight (8) inches in diameter. All gravity sewer line pipes shall be of bell and spigot and gasket joints.

(D) The longitudinal bending of sewer pipe is not allowed.

(E) Testing of gravity sewer lines and manholes may include multiple test methods to ensure a minimum of inflow and infiltration. Sewer lines shall be subject to but not limited to low pressure air testing, deflection testing, and closed circuit TV inspection. Manholes, at a minimum, shall be vacuum tested after the frame and cover are installed.

(F) Low-pressure sewers are discouraged and shall be only accepted under special circumstances. If accepted, civil engineer design shall be provided by the developer.

(G) Pump stations that are to be operated and maintained by the city shall include odor control, corrosion mitigation measures, and supervisory/control and data acquisition systems. Pump stations feeding force mains two (2) or more inches in diameter shall be solids-handling type. Grinder pumps may be used for smaller diameter force mains. All-weather access and fencing shall be provided.

(H) Sewer house service connection shall have adequate separation or protection from potable water house service connections. Sewer service lines shall be installed at points ten (10) feet from the lowest lot corner adjacent to the sewer main. Crossing of water and sewer service lines, especially a low pressure sewer with water service line, may require that the sewer service line be sleeved.

(I) The city will not issue any certificates of occupancy until the subdivision improvements are accepted for maintenance and operation by the city council.

(J) Drop manholes are discouraged; outside drops are prohibited.

(K) Sewer lines shall be stationed beginning at the downstream manhole. Plan views shall include stationing unique to the sewer line plus street station offsets. Profiles shall have the sewer line stationing only. Pipe lengths shall be listed on the profile. The lengths shall be the horizontal length from manhole perimeter to manhole perimeter. Pipe invert elevations shall be calculated and noted on the profile at the point where the pipe enters the manhole. Other profile data include manhole rim elevations, invert data (elevations, pipe diameter, compass orientation, slopes on pipe rims, etc.).

(L) Curvilinear Sewers (Refer to the Details in the City of Show Low Supplement to MAG Specifications).

(1) Curvilinear sewers will be considered only on a case-by-case basis. The sewer must maintain a constant horizontal curvature between manholes. Manholes must be spaced at five hundred (500) feet maximum, measured along the arc of the curve from manhole to manhole. The curve must be concentric with the centerline of the roadway. Curved sewer pipelines are allowed only in new subdivision roadways.

(2) The pipe material type shall be consistent between manholes. Vertical curves in the sewer pipe are not permitted. Only full manufactured lengths of pipe shall be used except for the last section laid in order to terminate at the correct location.

(3) The minimum radius of the curved sewer must be twice that of the manufacturer’s published minimum but at no time will it be less than three hundred (300) feet.

(4) Tracer wire shall be installed in the main line pipe trench at a depth of thirty (30) inches. Tracer wire shall be terminated in monument boxes located no more than three (3) feet from the manhole on each end of the curvature.

(5) Sewer lines must pass a mandrel test and pressure test per ASTM 1417.

(6) Service laterals shall be radial to the main. Tracer wire is required on the laterals. (Ord. No. 2008-12, §§ 1, 2, 9-16-08; Ord. No. 2019-02, § 1, 2-5-19. 1976 Code § 12-4(h))