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<br /> 1
<br /> ;�, Jann b Renee Olsten
<br /> �,; ; I�ay 18, 1983 ;
<br /> Page 2 k
<br /> � �
<br /> �, : �
<br /> �' PERCOLATION TESTS �
<br /> �'�: ' �
<br /> ' Th� pc�rcalotldn t.aot, data 14 yivari un Liia at,t,a�fia�J bhaaCe. whlcf� ar'e COpies Of the �
<br /> actual field test sheets. A sheet describing the general test procedures followed t
<br /> t � is also included. t
<br /> , �,
<br /> � The percolation rates are somewhat faster than normally expected for a sandy clay y
<br /> � E.
<br /> (clayloam ) type soil , especially when considering the wet, spring time conditions
<br /> ` found at the site.
<br /> ;
<br /> ' � SEWAGE TREATMENT SYSTEM
<br /> ,
<br /> : It is our understanding that it is planned to construct a three bedroom house with
<br /> " � a total floor area approuching 3200 sq. ft. It is planned to place the first floor
<br /> a• " at about elevation 984' , indicating the ground floor slab will be placed at about
<br /> � � 977' or slightl; thereunder.
<br /> i'tt;i
<br /> s;:. ; Existing conditions are not suitab�e for constructing a normal drain field treatment
<br /> ��� system; however, a workable system can be const��ucted, as described below.
<br /> 'i��
<br /> �:�; � The percolation test results show a range of about 40-160 min/in. We suggest that
<br /> �� the size of the treatment area be based on a percolation rate of about 80 min/in.
<br /> �`��� We suggest that the �erforated, lateral lines be placed near• the surface and that
<br /> �`�"' the trench area ba long and narrow. For a type I , three bedroom home, the estimated
<br /> �, daily sewage flow is about 450 gal/day, We suggest that the trench bottom area be
<br /> t'" based on 2.45 sq. ft./c,al/day� for a total trench bottom area of 1100 sq. ft.
<br /> We suggest that two long trenches be constructed. The trenches should be 2' wide
<br /> z`;.:' and excavated to 24" below the existing surface. About 6" of relatively clean sand
<br /> ;`� with less than 10� material finer than the �200 sieve should be placed in the bottom
<br /> and tapered up the sides. About 12" of clean gravel , corisisting of 3/4" to 2�"
<br /> 4�+ diameter material , should be provided for below the perforated tile lines and should
<br /> r extend a minimum of 2" over the lines. By placing the 6" of sand,y soil and 12" of
<br /> '� gravel , the total trench 'aottom area can be reduced by about 30�� to 770 sq. ft. � re-
<br /> ;; sulti.�g in two lony trenches of about 190' in lenyth. This will require atout 45
<br /> �. .
<br /> cubic yards c�f clean gravel and abour, 20 cubic yards of sand.
<br /> �;� ' �,�
<br /> A drop box sliould be located at the center of the first trench with 95' long lines�- ••� �
<br /> �i e�ctending in both directions. Th� uNper lir�e car� be placed at about elevati9�'� 875' .;
<br /> �� The lower line should be placed about 10' or more from the upper line and col�ected
<br /> �� with drop boxes located at each enri of the upper line. About 4" of hay or str�w
<br /> .=�g should be placed �ver the gravel un�i should be co��ered with red rosen paper. About
<br /> ° � 4"-6" of silty sand (sandy loam) t,�p� soi�l shculd be placed over the rosen paper
<br /> �� followed with about 4" of topsoil dr�,siny and a thick grass cover. The final grade
<br /> ';'� in the drainfield area will bF about 8" hi9her than the present yrade,
<br /> ��
<br /> ;� Ideally� the sewa��� treatinent syst��n �huuld be constructed in the late summer or
<br /> j fall at wh�ch time the water content of th� sandy c:lay soil is normally at the lower
<br /> end of the rnoist�rre cycle. This would tend tu minimize smearing and tightening of
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