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Materials Used in Tile Fields
All lines, other than the building sewer line, not extending over excavation must be a minimum of 1,500 pounds crush strength approved rigid piping and non-corrugated. Pipe used in the tile field must be four-inch diameter, rigid with smooth interior walls, and with leaching holes of a minimum of 5/8 inch diameter with three sets of three holes per lineal foot.
Stone must be clean gravel or limestone with a diameter of 3/4 inch to 1 1/2 inches (#4 or #57 are generally acceptable). Slag is not approved, and two inches of straw or hay, or untreated building paper or landscape fabric shall cover the top of the stone fill.
Leaching Tile, At-Grade and Evapotranspiration (E.T.) Tile Fields
1. Distribution (d-box) boxes and splitter boxes must be extended to final grade and level.
2. The D-boxes and splitter boxes must be on undisturbed earth or properly bedded in stone to avoid future settling and uneven distribution of flow.
3. Each trench must have a separate and individual header line from/to the d-box.
4. Inlet and outlet tiles at D-boxes and splitter boxes shall be properly sealed and watertight; equal distance above bottom to provide even distribution flow; and arranged so the Inlet is higher than the outlets.
5. Header lines from D-box must be solid, without holes, to leaching trenches.
6. Header lines can be installed on undistributed earth or be properly bedded.
7. Leaching lines shall not exceed 150 feet. Exception: an E.T. leaching line shall have a maximum length of 100 feet.
8. On level installations, the ends of the leaching lines must be either connected or capped (capped ends are required on installations of slopes).
9. The leaching line and bottom of the trench shall have a relatively level grade. The grade shall not exceed a fall of three-inches (3?) in 50 feet.
10. Leaching trenches must have a minimum width of 24-inches and be installed on 10-feet centers.
11. The final grade shall be such that surface drainage is prevented from draining onto the household sewage disposal site.
12. An At-Grade, E.T. leaching tile field or a curtain/perimeter drain shall not be installed within the drip-line of surrounding trees.
13. The center of the hole of the tile shall be placed down.
14. The fields should not be installed on slopes greater than 15 percent.
Leaching Tile Field Specifications
1. The trench depth shall be a minimum of 18-inches but no more than 30-inches.
2. There shall be a minimum of 12-inches of stone beneath the tile, extending at least two inches above the tile.
3. Leaching the field trenches shall be a minimum of 10-feet from all lot lines.
4. A “graveless tile field system” must be approved by the Health Department for use on an individual lot.
Evapotranspiration (E-T) Field Specifications
1. The evapotranspiration field trench depth shall be a minimum of 12 inches, however, if deeper than 12 inches, increase depth of stone beneath tile accordingly. Bottom of tile shall be not more than 6 to 8 inches below original grade.
2. There shall be a minimum of six to eight inches of stone beneath the tile, extending at least two inches above the tile.
3. Entire field shall be elevated and crowned with topsoil. Final grade shall be five to eight inches above original grade.
4. Field shall be a minimum of 100 feet from all lot lines and shall be located prior to installation during pre-installation site review between installer and Registered Sanitarian.