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Resolution No. 983 <br />Page 5 <br />• 9. Cont. <br />A. 5. Soils - The following soil classification series will <br />in many cases be considered unsuitable for the installation <br />of standard systems, but acceptable for a properly designed <br />fill trench system. <br />Erin - EnB, EnC <br />Hayden - HbB, HbC, HcB2, HcC2 <br />Heyder - HeB, HeC <br />Lester - LrB, LrC, LsB2, LsC2 <br />B. General Requirements <br />1. In no case shall excavation for the purpose of <br />constructing a fill trench system be made unless the <br />moisture content is lower than the plastic limit of <br />the soil. <br />2. In no case shall filter material be placed in <br />contact with original soil having a percolation rate <br />slower than 60 minutes per inch. <br />3. At least 6" but no more than 12" of fill material <br />• having a percolation rate of between 5 and 30 minutes <br />per inch (loamy sands and loams) after placement shall <br />be placed between the filter material and the original <br />soil along the excavation bottom and sidewalls. <br />4. The size of the soil treatment system shall be based <br />on the required treatment area for a soil having a <br />percolation rate of 60 minutes per inch. <br />5. All other requirements of standard drainfield trenches <br />as of Section 6 apply. <br />6. A pressure distribution system is strongly recommended <br />for use with fill trenches. <br />Passed by the City Council of the City of Orono on the —twenty—third day <br />of January 19 79 <br />f <br />William B. Van Nest, Mayor <br />ATTEST: <br />• <br />iC <br />Waiter R. B son, Clerk/Administrator <br />