1989.03.06 ORD 1989-256 - Laserfiche WebLink

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sound and durable material not subject to corrosion or decay or to loss of strength under continuously wet conditions. (2) Perforations shall be cleanly bored , sized and spaced as shown in Table 1 . Distribution pipes shall be laid level or on a uniform slope of not more than four (4 ) inches per one hundred ( 100) feet away from the distribution device' 1 . Filter material shall be covered with three (3) to four (4) inches of uncompacted hay or straw, or other approved permeable material ' m. Trenches shall be backfilled and crowned above finished grade to allow for settling . The top six (6) inches of backfill shall be of the same texture and density as the soil adjacent to the trenches' n . Themmioimum -depthof sxzil cover over the distribution pipes shall be eight (8) inches. The maximum depth of cover shall be twenty-four (24) inches. `—i o. The owner or his agent shall establish grass cover over the soil treatment area as soon as possible after installation to protect the system. Where seeding cannot be accomplished prior to September 1 , the soil treatment area shall be protected by a uniform cover of hay or straw. (4) Dual fields. a' Dual field systems may be installed in soils having percolation rates slower than five ( 5) minutes per inch. b. Dual field systems shall be sized , designed and constructed as set forth in this Ordinance for standard systems except as follows: ( 1 ) The soil treatment area shall be divided into two (2) or more equal parts. (2) Alternating soil treatment areas shall each be connected to a valve box outlet. c ' Any portion of a divided system shall be used for no more than one ( 1 ) year unless inspection of effluent levels indicates that a longer duration is acceptable. 26