1989.03.06 ORD 1989-256 - Laserfiche WebLink

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[ '- ! d . A rubber tired tractor may be used for plowing or . disking but in no case shall such equipment be used after the soil preparation is completed in soils having a Percolation Rate slower than fifteen ( 15) minutes per inch. A crawler or track type tractor shall be used for these conditions. e. Mounds shall not be located on slopes exceeding twelve ( 12) percent under any conditions. f . Mounds shall be installed only in areas where existing soil conditions provide a minimum twenty-four (24 ) inch depth to Water Table or Bedrock . g. The bottom area of the filter material shall be sized on the basis of 0.83 square feet per gallon of waste per day. h. In no case shall the width of the filter material in a single bed exceed ten (10) feet. i . Mound locations shall be subject to setback requirements listed in Table IV. Distances shall be measured from the toe of the slope. Installation of mound systems shall , in all cases, require installation of water use metering at the dwelling or facility being served . k . Mound construction shall proceed immediately after completion of soil surface preparation. (3) Mound construction . a. A minimum of twelve ( 12) inches of Sand (302.01-25) shall be placed over the prepared surface to the limits of the proposed filter material . A crawler type tractor and blade shall be used to move sand into place, maintaining a minimum of six (6) inches of sand beneath the equipment to minimize compaction of the soil surface. The sand layer shall be level when placement is completed . b ' Filter material to a minimum depth of nine (9) inches shall be placed over the sand layer, below the distribution pipe. c . Distribution of effluent over the filter material shall be either by four (4) inch distribution pipe with gravity flow from a distribution box or by perforated pipe under pressure from a manifold ' 31 2