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§ 8.S0 ] ] ] ] Any soil treatment area shall be set back the following distances if located in an area wt~ah has been designated as follows by any local, state or federal regulation. in Feet l{ecreatic' ml development lakes 75* Oeneral development lakes and streams 50 '- Wild river Scenic river 100 Oritica/ river 100 Designated tributaries of wi[d, scenic and recreational Hvers *Required for new developments and, where applicable, for ex/sting developments. Soil treatment' areas shM] not be placed in flood plains delineated by local or~nsnces adopted in compliance with the Statev~de Standards And Criteria for Afanagement of Flood Plain ~reas of 1Vf~nnesota (Chapter 619.0), or in areas for wtJch regional flood information is available from the DepartInant of l~tesources except %]mit in areas where ten year flood ~nformation is available from and/or approved by the DIq}l, soil treatment systems may be installed in accordance vzith the provisions of Chapter 7080.0210. Soil treatment areas of individual sewage treatment systems that are designed to treat an estimated daily sewage flow greater than 3,000 gallons per day must be separated from other s{rn{]arly sized systern~ by at least 800 feet. I)eMgn and construction. 1. The bottom of trenches smd beds shall be at least 4 feet above the water table or bedrock The trenches shall be not less than 18 inches, nor more than 36 inches wide. Any trench wider than 86 inches shall be considered a bed. i~o bed may be wider than £$ feet and parai]el beds must not be located closer than 10 feet apart. Trenches and beds shall be not more than 100 feet in length. The bottom of the trench of bed excavation shall be level. The bottom and sides of the soil treatment system to the top of the drainfie]d rock shall be excavated in such a maazner as to leave the soil in a natural, unsmeared, and uncompacted ] Printed 12/28/90 Page 251