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r <br />~ ~ the horizontal inlet line and the area of the bottom of the pit, excluding any <br />impermeable stratum penetrated. Dry wells so sized may only be permitted in soils <br />d with a percolation rate faster than sixty (60) minutes per inch. Drywells shall be <br />~ separated by a distance equal to the depth of the excavation or ten (10) feet, <br />whichever is greater. <br />® E. Crravelless Soil Absorption System: <br />i <br />~ All gravelless soil absorption systems shall be approved by the Colorado Department <br />- of Heahh. Where permitted by the local boazd of health these systems shall be limited <br />to only those absorption area reductions given through the local health department's <br />certification. The absorption area of a chamber type absorption system shall be <br />~ equivalent to the footprint of the interior of the chamber (Interior base areas). <br />D 6.(~ Seriai distribution System <br />A serial distribution system may be used in all situations where a soil absorption system is <br />permitted and shall be used where the ground slope does not allow for suitable installation of <br />. a single level absorption field, unless a distribution box or dosing chamber is used. The <br />horizontal distance from the side of the absorption system to the surface of the ground shall <br />be adequate to prevent Lateral flow and surfacing of effluent above ground. When a serial <br />d distrbution system is used, the following design and construction procedures shall be <br />,,,~ followed. <br />~ A. The bottom of each absorption 5eld and it's distribution line shall be level. <br />~ _~ B. There shall be a minimum of twelve (12) inches of ground cover over the gravel fill. <br />~ C. An absorption field shall follow approximately the ground surface contours so <br />! - vaziation in absorption field depth will be minimized. <br />- d D. There shall be a minimum of six (6) feet (horizontal measurement) of undisturbed <br />~ earth between adjacent absorption field trenches and between the septic tank or other <br />treatment unit and the nearest absorption field. <br />~! <br />~,~ E. Adjacent absorption fields shall be cormected with a relief line or a drop box <br />~ arrangement such that each trench fills with effiuent to the top of the gravel before <br />flowing to succeeding trenches. <br /> <br />',t <br /> <br />-9 <br />'~1 <br />;, <br />.~- - <br />~ <br /> 43 <br /> <br /> <br />