05-22-1978 Planning Packet - Laserfiche WebLink

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#367 Mike Gaffron, Septic System Inspector May 16, 1978 SUBJECT: Septic Systems - Soil Testing, Stielow Subdivision A review of the soil testing information submitted by Hickock annssoclatS for the Stielow Subdivision leads me to the following conclusions: Lot 1 - Percolation rate 11 mln./inch; 5 at site; water table at 2-4 feet; mottled ‘■elow 3 f«t. «^ter table is too high for a standard system. Slopes ^ site arc too steep for a mound system. ^ ^ lot are: 1) a mound system in the secondary dralnfield area, 2) holding tanks; or 3) declare the lot as unbuildablc. Lot 2 - Percolation rate 24 min./lnch; 23 mln./inch at ^te waS table at 3-7 feet. Primary site is near or within existing dralnfield. Slopes of 0-67.. Due to high water table, TmounS system or shallow trenches would be necessary. Tot 3 - Percolation rate 83 rain./inch; 83 mln./inch at secondary ^te? wat« table at 3-7 feet; slopes of 6-12X. High indicates standard trenches will not be acceptable (so .1 mottling indicates stan ^ a high seasonal water table). sLpes «e too ^teep for a mound system, and P«= slow for shallow trenches. 1 believe it may be a mound to the southeast of proposed drainfields wh«e the p is more level. Additional testing would be necessary. Lot 4 - Percolation rate 100 min./inch; 33 min./inch at site. The lot is presently being retested to find a more suitable site. Lot 5 - Percolation rate 27 min./inch; 53 min./lnch at secondary wUer table at 8 ft. Soil mottling below 6 ft., slopes 4_L2H, a standard system could be installed on this o . Lot 6 - Percolation rate 67 min./inch; 30 mln./inch at secondary ^te Water table at 3.5 - 8 ft. Mottling at 3.5 ft. A mound sj“;m would be necessary on this lot due to high water table and slow perc rate.