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28. Roof rafter to 2-ty ridgel,eam <br />Sewer pipe shall bn no deeper than lfi - <br />beinw finish grade, A depth gre.ater <br />than 18" will require an approved <br />lift station.. Maximum depth of leach <br />fine is 42". Maximum soil cover over <br />chanter type systems is 24". <br />— <br />SAN