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! <br />#615 Ringer Subdivision <br />Page 6 <br />Lot 6, Block 2 <br />Peres PA61 thru PA66. Borings BA61 thru BA63. Slopes are nearly <br />level. Mottling occurred below 1.5', with actual water <br />encountered below 5.7'. (Note that soil appears <br />below 2.5') Perc rates were acceptable, although l ot b taxen <br />at depth very very slow. Both primary and secondary sites shouia <br />use mound systems. <br />Lot 1. Block 3 <br />Peres PCll thru PC14. Boring BCll and BC12. This lot contains <br />an existing house, garage and barn. The existing septic system <br />is unknown and was not located during my routine <br />percolation rate is 21 minutes per inch; soil indicate <br />soils suited for a shall « trench or mound system, with mottling <br />beginning at a depth of ‘ . This is the highest <br />in the entire subdivision and appears to be the only lot poss y <br />suited for a shallow trench system. An attempt should be made <br />to locate the existing system to ensure it is within the lot <br />boundaries, although there is only a remote possibility that it <br />isn't. <br />Lot 2, Block 3 <br />Peres PC21 thru PC24. Borings BC21 and BC22. This lot contains <br />an existing house and small shed. The existing septic system is <br />unknown ar.d was not located during my inspection last July. No <br />evidence of system failure is noted. While the existing system <br />that the replacement system, should it ever be necessary, wuld <br />probably have to be a mound. Percolation rates averaged 56 mpi. <br />It would aldo be advisable to locate the existing system to ensure <br />it is within the new lot boundaries. <br />B. Discussion of Mound Systems <br />Since the proposed Ringer subdivision appears to need mound systems <br />throughout, it might be worthwhile to review the conditions which <br />favor use of mound systems over conventional trench systems. <br />As you are aware, a biomat forms at the rock—soil interface in a <br />standard trench system. This biomat acts as a "valve" to slow <br />the downward percolation of septic tank effluent to a rate where <br />the flow is unsaturated, i.e. air in the soil pores is in contact <br />with the percolating effluent. Under these essential conditions, <br />adeguate sewage treatment will occur. However, in many soils, <br />either a seasonal saturated condition or^ extremely fine, impermeable <br />soil texture (or both) tends to eliminate the air/effluent contact <br />and also severely limits the soils capacity to absorb large amounts <br />of effluent. To ensure that a standard trench system is not