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(4) When sewage tank effluent is delivered to the drop box by a <br />pr�ap, the pump discharge shall be directed against a wall <br />or side of the box on which there is no outlet. <br />(5) The drop box shall have a removable cover either flush or <br />above finished grade or covered by no more than six inches <br />of soil. <br />III. DRAIN FIELD - Final treatment and disposal of all sewage tank <br />effluent shall be by means of soil treatment. <br />1. SIZING <br />Indicated average percolation rate is 32.7 minutes per inch for <br />the primary site and 20.0 minutes per inch for the alternate site. <br />The proposed flow rate into the system is based on the require- <br />ments for a four-bedroom house. <br />A. Total drainfield absorption area is 1200 square feet. <br />B. Drainfield trench bottom width is 3'. <br />C. TOTAL lineal feet of drain tile is 400. <br />D. This requires 5 laterals of 80 feet in length. <br />(See Figure 1 for typical placement.) <br />E. Minimum spacing of laterals is 7.5 feet from center <br />to center. <br />2. LOCATION <br />A. On slopes in excess of 12 percent the soil profile shall be <br />carefully evaluated in the loca*ion of the proposed soil <br />treatment area and downslope to identify the presence of <br />layers that mai► cause sidehill seepage. In no case shall a <br />trench be located within 15 feet of such a layer surfacing <br />on the downslope. <br />B. Bed construction shall be limited to areas having natural <br />slopes of less than six percent. <br />C. Any soil treatment area other than seepaqe pits shall be set <br />bacx the following distances from the features given below: <br />Feature <br />Set back distance <br />in feet <br />Water supply well less than 50 feet deep <br />and not encountering at least 10 feet of <br />impervious material 100 <br />- 7 - <br />