(a) Sanitary Sewerage and Water Lines. Field tests shall be conducted before the systems are placed in service, if deemed necessary by the City Engineer. The tests shall be performed as specified herein, in the presence of a representative of the Director of Public Service. Preliminary tests and repair or correction of all faulty work shall be completed before calling the representative to observe the test for acceptance.
Disposal of testing media must be done with full consideration to flooding or damage to the piping, other installation, adjoining property and the safety of personnel.
(1) Testing equipment. All necessary apparatus and equipment required for testing, including pumps, barrels, gauges, mirrors, temporary lines and fittings, shall be furnished by the persons constructing the sanitary sewers, water mains and/or appurtenances thereto.
(2) Water lines. The piping shall be tested hydrostatically and permissible leakage shall be as specified in the AWWA Standard which is evaluated for a pressure basis of 150 psi.
Permissible leakage shall not be more than seventy-five U.S. gallons per twenty-four hours per mile of pipe per inch of nominal diameter of pipe.
The City water piping shall be thoroughly sterilized with chlorine and flushed before it is placed in operation. The chlorinating materials shall be introduced to the City water piping under the direction of the Director of Public Service. Following a contact with clean water until the residual chlorine content is not greater than two-tenths ppm. Tests for efficacy of sterilization shall be made by the developer and repeated sterilization shall be performed by those installing the work as required.
(3) Sanitary sewerage. All sewers shall be constructed and so jointed that infiltration of water into, or leakage of sewage therefrom, shall not be greater than hereinafter specified when subjected to the following leakage test:
After sewers, or sections thereof, have been constructed and the backfilling has been sufficiently completed to prevent flotation of the pipe, and at times and locations selected by the Director of Public Service, sections of the sewer shall be isolated and the test shall be made by plugging the downgrade end of the section to be tested and a temporarily installed curve or other fitting, shall be used at the other end so that the station to be tested can be filled with water with four feet of head at the upper end for a period of one hour. The four feet of head shall be measured above the crown of the pipe, and in cases where the ground water table is higher than the sewer, the four feet of head shall be measured above the water table.
These isolated sections of sewer shall be from manhole to manhole in order to test only the sewer pipe, and the maximum rate of exfiltration shall be 400 gallons per inch of diameter of pipe per twenty-four hours per mile of pipe.
Manholes shall be plugged and tested separately. The maximum ground water infiltration for a manhole four feet in diameter shall be 0.291 gallons per vertical foot per hour.
Before the leakage test, the sewer shall be subject to a test for grade, line and cleanliness. The test shall consist of a visual inspection of the sewer. Mirrors will be used to cast a beam of light into the sewer at each manhole and the inspection will be made by sighting through the sewer from manhole to manhole.
All obstructions found in the sewer shall be removed and irregularities in line and grade shall be straightened.
(b) Concrete Pavement. Compression test cylinders shall be made by the inspector each day. If further tests are deemed necessary by the City Engineer, he shall so direct that these be made in addition to the compression tests. If the cylinders do not show the required compressive strength is attained, borings of the pavement shall be required, and if these show the pavement to have less than the required compressive strength, the pavement shall be removed and replaced.
(Ord. 69-35. Passed 10-27-69.)
(Ord. 69-35. Passed 10-27-69.)