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0615 Ringer Subdivision <br />.image 6 <br />1.ot 6, Block 2 <br />Peres PA61 thru PA66. Borings BA61 thru BA63. Slope:; are nearly <br />level. Mottling occurred below 1.5', with actual water <br />encountered below 5.7'. (Note tj;at soil avpea=s saturated <br />below 2.5') Perc rates were aCLeptabl,:, although t of 6 taken <br />at depth very very slow. Both primary and secondary sites should <br />use mound systems. <br />Lot 1, Block 3 <br />Peres PC11 thru PC14. Boring DC11 and DC12. This lot contains <br />an existing house, garage and barn. The existing septic system <br />is unknown and was not located during my routine insp:^ction in <br />July 1981, although no evidence of failure was noted. A future <br />drainfield site has been tested to the south of the house. Average <br />percolation rate is 2.1. minutes per inch; soil borings indicate <br />coils suited for a shallow trench or mound system, with mottling <br />b-aginning at a depth of 5'. This is the highest elevated point <br />in the entire subdivision and appears to be the only lot possibly <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-rcriote possibility that it <br />isn't. <br />Lot 2, Block 3 <br />Peres PC21 thru PC24. Borings BC21 and DC22. This lot contains <br />an existing house and small shed. The existing septic system is <br />unYno:m and was not located during my inspection last July. '.o <br />evidence of system failure is not:^d. While the existing system <br />undoubtedly consists of trenches, soils data proviked for a future <br />drainfield site indicates mottling at a 3.5' depth. This indicates <br />that tho rcplacemcnt system, should it ever be necc3sary, would <br />probably have to b^ a mound. Percolation rats aLeraccd 56 mpi. <br />It would elto be advisable to locate the system to enE;ure <br />it is within tho new lot boundaries. <br />B. Dinaunnion of Mound Systcmi <br />Since the proposed Ringer subdivision appears to need mound systems <br />throughout, it might be worthwhile to review the conditions which <br />favor u,.e of mound aystcrns over conventional trench systc.-nn. <br />A, you are aware, a biomat forms at the rock -nail interface in a <br />standard trench system. This biomat acts as a "valve" to slow <br />the downward percolation of septic tnnk efflucrit to a rato ♦:fiche <br />the flow is unsaturated, i.e. .tir in the coil pores is in contact <br />with the percolating effluent. Under thoso enocntial conditions, <br />adec late sewage treatment will occur. 1io%,evcr, in ninny soils, <br />eitL!r a seasonal saturated condition or extremely find, impermeable <br />roil tc:cture (or both) tends to eliminato the air/effluent contact <br />and al.no severely limit3 the soils capacity to absorb large amounts <br />of effluent. 'Io ensure that a standard trench Gy3tem is not <br />