All side sewers shall be laid on a grade one-quarter-inch per foot (two percent) for four-inch pipe and one-eighth-inch per foot (one percent) for six-inch pipe or greater.
(Ord. 198 § 6.01, 1975)
The requirements of TMC § 13.30.270 may be waived by the superintendent in his discretion, but in such cases the following requirements will be adhered to:
(1) 
Upon approval by the superintendent, a backwater valve shall be installed on all side sewers below grade as above prescribed unless the superintendent waives this requirement;
(2) 
The effective operation of any backwater valve shall be the responsibility of the owner of the side sewer;
(3) 
No installation of any side sewer below grade as prescribed in this section nor any installation of any backwater valve shall be approved by the superintendent until the application has been executed and a grade release in form prescribed by the superintendent agreeing to save the town harmless from all damage resulting therefrom.
(Ord. 198 § 6.04, 1975; Ord. 628 § 1(JJ), 2011)
Side sewers shall be laid out not less than 30 inches from any foundation wall, outer lines of any footings, pilings or buildings supports.
(Ord. 198 § 6.05, 1975)
Except as provided in this chapter, minimum cover for side sewers shall be three feet in outside parking strip, two feet in inside parking strip, three feet in a public alley at the property, three feet where side sewer crosses under a ditch, and 36 inches on private property.
(Ord. 198 § 6.06, 1975)
(1) 
If a building sewer is to serve more than one property, by joint agreement of the owners, an approved document insuring that all properties involved shall have perpetual use of the side sewer, and having provisions for maintenance and for access for repair purposes shall be signed by the record owners.
(2) 
This document shall be notarized and recorded with the county auditor and shall be referred to as an "easement."
(Ord. 198 § 6.08, 1975)
Except as provided in this chapter, all side sewers servicing a single house may be of four-inch pipe or larger. All side sewers servicing multiple dwellings, commercial establishments, schools, or any building other than single-family residences shall be of six-inch pipe or larger.
(Ord. 198 § 6.10, 1975)
(1) 
Any connections to a septic tank, cesspool, or privy vault, will be removed and direct connection made to the house or building drain; provided, however, that connection may be made through existing septic tanks or cesspools, but in such event cast iron pipe shall be used through such cesspool or septic tank.
(2) 
In all cases, such cesspool or septic tank shall be properly disinfected and filled with suitable material.
(Ord. 198 § 6.11, 1975)
The side sewer contractor or other persons doing the work shall prevent any damage to the sewer main, tee or stub out, and shall so conduct his trenching operations as to prevent the possibility of damage occurring. Undercutting of sewer main and wye is prohibited.
(Ord. 198 § 6.14, 1975)
In the event there is no suitable tee or stub-out, a tap to the main may be made only by the town of Twisp. The tap shall be made in the manner solely determined by the superintendent. All costs associated with completing such tap to a main shall be paid by the person requesting such tap within 20 days of mailing or providing a statement to the person, contractor or agent of the person that requested such tap.
(Ord. 198 § 6.15, 1975; Ord. 747 § 1(D), 2019)
The bottom of the trench must be smooth and free of large rocks which may injure the side sewer pipe. Where unsuitable bedding is found, as determined by the superintendent, the side sewer contractor or other persons doing the work shall overexcavate and prepare a bedding as follows:
(1) 
Hard foundation: Overexcavate a minimum of three inches and install a bedding of properly graded sand.
(Ord. 198 § 6.16, 1975)
The side sewer contractor or other persons doing the work shall carefully remove the plug from the tee or stub out and shall prevent the entrance of all foreign material into the pipe. The type of joint to be used for connecting the side sewer pipe to the tee or stub out shall be that for which the wye was designed. Rubber or plastic joint adapters shall be used as required to connect pipes and wyes of different materials or joint designs. Selected bedding material as outlined in TMC § 13.30.345 shall be hand-tamped in a moist condition under and around the wye and connection to the wye made so as to prevent any pressure on the wye. Care shall be taken to prevent the dislodging of this hand-tamped material during the balance of the backfill and water settling operation. All sewers shall be laid true to grade with the bells upgrade. Pipe shall be firmly bedded for the full length of the barrel in the prepared trench bottom. Pipe shall be carefully centered prior to the joining. Joints shall be installed in strict compliance with the manufacturer's recommendations. Spigot ends shall be thoroughly cleaned before applying gasket cement and rubber gaskets. The interior surface of the bell previously laid shall be thoroughly cleansed and coated with gasket cement or lubricant as recommended by the manufacturer. After the section being laid has been carefully aligned, the joint shall be completed.
(Ord. 198 § 6.18, 1975)
(1) 
The first joint inside the property line and the first joint outside the building foundation wall shall each be a tee with the branch installed upward.
(2) 
The tee connection shall be of the same size as the service run. A vertical riser shall be installed in the tee after testing the side sewer as outlined in Article VIII of this chapter. This riser shall be brought to within 12 inches of the finish grade and capped with an approved plug. The plug shall be machined to fit the standard joint of the pipe being used, with the standard gasket. If the inspection riser is under a paved driveway, then it shall be brought to a point just beneath the surface and the plug enclosed in a suitable cleanout casting and cover.
(Ord. 198 § 6.19, 1975)
The connection to the sewer pipe at the building shall be a suitable rubber gasket sleeve or adaptor, or other type of connection specifically approved by the superintendent.
(Ord. 198 § 6.20, 1975)
Backfill of the trench shall be done in a manner which will prevent damage to the pipe. All backfill between the sewer main and private property line, where applicable, shall be water settled or mechanically tamped in a manner approved by the superintendent.
(Ord. 198 § 6.21, 1975)
Parallel water and sewer lines, wherever possible, shall be laid at least 10 feet apart horizontally. Wherever it is necessary for sewer and water lines to cross each other, the crossing shall be made at an angle of approximately 90 degrees, and the sewer shall be located three or more feet below the water line if possible.
(Ord. 198 § 6.22, 1975)
Where physical conditions render compliance with the foregoing provisions of this article impracticable, the superintendent may issue a special permit for installation of a side sewer requiring compliance with said provisions insofar as is reasonably possible, but such permit shall be issued only upon condition that the permittee execute and deliver to the town of Twisp an instrument, in form furnished by the superintendent, agreeing to save harmless and indemnify the town of Twisp from any damage or injury resulting from such substandard installation.
(Ord. 198 § 6.23, 1975; Ord. 628 § 1(KK), 2011)
All 90-degree turns shall consist of a long sweep 90-degree turn or two 45-degree turns with a short coupler between to allow for augur passage for cleaning.
(Ord. 198 § 6.25, 1975)
(1) 
Whenever a request for change of use classification for any single-family dwelling served by a four-inch side sewer shall be made, which request for change of use classification would require a side sewer size six inches or larger, as required by TMC § 13.30.315, the applicant/owner of the property shall, at the expense of the applicant/owner, install such larger size side sewer, as required by TMC § 13.30.315, and connect the same to the town sewer collection system, in accordance with the provisions and inspection requirements of the town.
(2) 
Waiver of installation of such larger side sewer pipe may be obtained only upon application made to and approved by the town council, and as a condition for granting approval of such waiver request, the town council shall require that the applicant/owner agree to assume and pay any and/or all damages to persons and/or property which may be sustained and/or incurred by the town, or any other person whomsoever. Further, the town council shall require as a condition for granting of such waiver a hold harmless agreement executed by the applicant/owner with surety thereon satisfactory to the town and approved by the town attorney.
(Ord. 198 § 6.26, 1975; Ord. 293 §§ 1, 2, 1984)