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111 . <br /> 2. Disposal Field: In_ addition to the general limitations upon <br /> location of any portion of a septic tank disposal system, no <br /> portion of a r13ovoszl field shall be located in a filled ground area, <br /> r,Y- t:ithin 50 feet of any creek, drainage ditch bank or any cut <br /> slope bank below the elevation of the disposal field. Leaching <br /> lines may not be laid in existing or proposed paved surface areas <br /> or areas subject to vehicular traffic. • <br /> The disposal field shall consist of leaching lines.laid in gravel <br /> lined trenches. Leaching line tile shall be of clay, not less than <br /> 4 inches in diameter, not more than l2 inches long and shall be <br /> laid with Ye." to j2" openings at joints. Perforated, bituminous, <br /> plastic or other types of leaching line may be used when approved by . . <br /> the Health Officer. Leaching lines shall be laid no closer than <br /> 8 feet on centers. <br /> The total lineal length of trench shall be determined from subsurface <br /> soil analysis based upon observations of test borings and percolation <br /> tests. Boring requirements and percolation test procedure shall be <br /> / • as- -described in Sections 6 and 7. Previous soil mantle shall extend • <br /> ( • for a depth of at least 3 focb below the proposed trench bottom. <br /> The water table shall not lie within three feet of the trench <br /> bottom. • Required depth of trench shall. be 6 feet. The Health <br /> Officer may permit modification of this depth. <br /> Trench width shall be not less than twelve inches .and not more than <br /> eighteen inches except that all of the trench in any one private <br /> sewage disposal system shall be of the same width. The trench bottom . <br /> shall be carefully excavated to level grade. Trench walls or those . <br /> portions of trench walls which have been sealed by the excavating . <br /> equip;=nt shall be scarified to the- satisfaction of. the Health. <br /> • <br /> Officer prior to placing of gravel. The excavated trench shall be <br /> filled with 3/4" to lh ' gravel from the bottom to the level of the <br /> base of the tile which shall be laid to grade. Gravel shall be added <br /> • <br /> to a depth of 4 inches above the tile, covered with building paper • <br /> to prevent clogging with earth and the remainder- of the trench <br /> backfilled. There shall be at least twelve inches of backfill below <br /> finished grade of adjoining ground surface. <br /> Cud <br />