§ 57-17. House sewers and joints.

A. 

House sewers generally. House sewers shall not be less than four inches in diameter, and preferably five or six inches, to avoid stoppages. The grade shall be at least 1/4 inch per foot for four-inch sewers and shall not be less than 1/8 inch per foot for larger sizes. House sewers shall be laid with tight joints to a septic tank or to a city sewer in a straight line and on a uniform grade, except where accessible manholes are provided at changes of direction or grade.

(1) 

Pipe for such house sewers shall be of cast iron, with leaded joints, to a point at least eight feet beyond the foundation wall of any cellar or basement. Portions of house sewers within 75 feet of a well shall be of cast iron, with leaded joints, but no portions of such sewer, however constructed, shall be within 25 feet of a well. No sewer shall be located within 25 feet of a cellar drain or groundwater drain, unless the pipe is of cast iron with lead joints.

(2) 

The sewer pipe from a house to a main in the street shall of four-inch extra-heavy cast-iron pipe, five-inch asbestos cement or six-inch vitreous tile. The joints of cast iron shall be poured lead joints.

(3) 

The specifications for asbestos-cement pipe shall be as follows:

(a) 

For asbestos-cement pipe, all joints shall be made with an asbestos-cement coupling. The coupling shall contain a centering ring and two sealing rings. The couplings will be assembled on the pipe by means of a soap lubricant, as furnished by the manufacturer. Tie-in connections between asbestos-cement pipe and cast-iron pipe shall be made with hot poured lead. In making rigid connections to fittings or structures, asbestos-cement pipe lengths shall not exceed five feet.

(b) 

All five-inch asbestos-cement pipe shall be made and tested in the United States. Each standard length of pipe shall be flexurally tested by the manufacturer before shipment, with a clear span of nine feet between supports with the total load divided equally and applied at the third points of the nine-foot span for nine-hundred-pound total applied.

(c) 

All asbestos-cement pipe shall be high-pressure steam-cured. The maximum alkalinity of the pipe shall be 60 milligrams of K.O.H. per gram of sample of material, as tested in accordance with the Western Electric Method.

B. 

Water-supply pipes. Water-supply pipes may not be laid within 10 feet of any part of a sewage disposal system.

(1) 

Water-supply pipes and house-sewer pipes may be laid in the same trench only if the sewer pipe is made of four-inch cast iron with poured lead joints and only if the water pipes shall be laid on a bench 12 inches above the top of the sewer pipe and at least 18 inches to the side of the sewer pipe.

(2) 

Where laid in a trench 10 feet or more distant from the water pipe, the sewer pipe may be made and jointed as specified in § 57-17A.

C. 

Location of system. No septic tank, cesspool, tile field, seepage bed or privy vault shall, without the approval of the Health Officer, be constructed within 75 feet of a well or spring or within 50 feet of a human habitation other than the building served, nor shall the same be constructed within 50 feet of a tributary of a water-supply reservoir or any ground- or surface water drain tributary to such reservoir. No part of the system shall be located within 10 feet of a lot line or within 25 feet of any stream, pond, lake or tidal water without approval by the Health Officer. No system shall be laid out in areas where high groundwater, surface flooding or ledge rock will interfere with its effective operation. The bottom of any leaching area or cesspool shall be at least 18 inches above maximum groundwater level.