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i'aLe -1 - the presence of the most preme,ble portions of this soil nearer the surface, means that a shallow trench systcm till probabl• 'unction better thai. 'he •tarklard system on this ,oil. Lerdal soils, colored light red on the soils overlay, commonly have a seasonal watertable at a depth of 3 to 5 feet. In addition, percolati-il rates on these soils are often in excess of 60 minutes per inch. For this reason an innovative mound system will function more effectively than eit►:era standar.. system or a shallow- subsurface system. Erin soils indicated by the mc-iit>ri reed color on the soils overlay have a high clay content in the subsoil. This often results in percolation rates in excess of 60 minutes per inch. For this reason it is recommended that an innovative motmd system be installed on thew soil,. These systems cannot be installed on slopes greater than 6 percent. This may represent a srious problem for the site plan as presently drafted. At times it is suggested that the watertable in areas of proposed waste treatment systems be lowered through use of agricultural drainage the to, provide the proper separation distance F't't1IL-en Seepage trenches and a water - table. U• of agricultural drainage tile for this purpose is relatively difficult for several reasonsi 0 the tile installed must be properly placed to ir:- sure that the watertable is sufficiently lowered n.jt to interfer with the systen.; ii) the the lines must `)e properly maintained by some party, tl i., includes the policing of the tile !lass to insure that they are not die turbed in anti• mariner by the homeowners or utility companies. UP P the presence o these tile lines offer a convenient outlet for anyone in the future who has problems with their %rite treatment system. An :"litional word of caution on using this t%Tw of arranyerient, is that little re,�e.tr_: has been conducte3 on the functioning of these systems and there is some question as to hog, well the-- will operate. The area indicated as Borrow pit presents another problem for the location of an on -site waste treatment systcr. : here systems, ar, .le> iLrtc-,l on tom• basis of natural soil characteristic,. This means trait the -tie -systems not be constructed on filled areas. There are pr imar i l v No. rva sons for this. First, it is difficult to determine the ;►cTneahilit, the filled area. khich makes sizing the system very difficult. SCCOTld, If "It' : ili (`;'.:c- the distribution iines of the s%•steel! will no lon:per be on :r:adc which will result in unequal distribution of the effluent, localized over-loadini, of the ti1',tem anti t'�-entua! failure of the ��'=tr'"': '.ri:'J:: i.i:A of <ufflc,;cw -C., . glellt :lied ska-f lclll" o` t :c c'.l! itlnit. For areas that have been graded it may he possible to have a suit absorn- t ion �vstem installer! if the minimur+ rc,• .E'tiiiU41! dis...rlce C,.ui i*C r,U111tained between the sec page tren: hes :and the watert thl�; anJ i `,* the permeabi l its• t.percolation rate) is rapid enough. The .'I.t t 't for the s%•stop. is greatly increased fax;ever, since tllr' UA C wCtr,C..Ole Ex)r t 1011- Alt t1 ak>l i have usu a I 1 v hcr:n rtiwved h .- -he t; r:au i.ng .. t he arpa rat ion d i s t:lrlc v lla. 1x-t i 1