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� ' �� �,/ �- , <br /> :.�. <br /> � � ^`�d1✓'1.iati�� ,�'•��`��y <br /> '��T`1 ; "�+kv''� f �.. «�t' <br /> i' �y> ia ry +p.� ,&�' Ff 7� n.� 4 ' <br /> � ;N �'f* „ 1 �- .. �1 x �R� yi�. 4 • " . <br /> t Z <br /> � �Y���' <br /> � � '�i�, '� �= <br /> � a � , trost ���� r '� <br /> ... �. y p . �y r ' �,';j: t `s�'�� � � F <br /> EROM�:� t Mi�h�r+�1�,ry'��;�,�a <br /> � t �� <br /> t�.f f i r. 1 c� a'�a.� ,��,iY M.e9:T:� 'kZ ����� ti-0 <br /> j �R <br /> D�i4►'!R:�. Jar�uaty 3, :::1984� ' ,,, <br /> 4 <br /> t i �l' <br /> � � � �r�;;� �� <br /> Stls.7���2i��_ Rev i aw ta��Se pt i+� Sys�tr�,;P � <br /> ��; � �, - ana New �e�ci�,�� ���n " ' <br /> k �{ :N <br /> r�� : a <br /> 1.� .� �f . . � ��y h ' J� � �� �- <br /> ryM. „�ny# �,�� -_. �. .. .;. - ,:,� Y'�'3�,,P ♦ i',�'s ��.� �h �� .��.!.'iF .. <br /> � .}. � MJ'+;� <br /> ��'����.x�.. M� <br /> y < : p p 9 � ,; � � ,� � , : <br /> drainfielc� to setve the S rin Hill ConferenCe Centec, and �risb �a�ak� <br /> 2 h�v�r� revte�red the lans subm�ttt�t� �� �`b <br /> the following comments: �, `�� �: <br /> �, <br /> 1. Site �valuation <br /> As related byJim Husnik of HGAand referred to byBill Kw�snyof GME i <br /> consultants 3n 4heir report, testfng was performed by GM� on <br /> various sites within the Sprin� Hill property and found steep <br /> slopes and slowly permeable soils to be a limiti�g factor for use as � <br /> drainfield. The final two site locations tested include a field + <br /> north of the main conference center and west of the main access � <br /> road, end the old gravel pit area southwpst of the conference � <br /> center. The proposed system c�esign uses the gravel pit location, � <br /> in which 2 soil borings Lo a depth of 8 ' and 4 percolation teats. ( <br /> were performed by GME. � <br /> : <br /> The percolation rates reported by GME for this site �veraged 3.3 � <br /> rnpi , requiring a trench bottom design rate of A.83 square feet p�r <br /> gallon per dr�y. The soil borings repoxted no mottling present and � <br /> no w�ter table encountered to � depth of 8' . This site Mould � <br /> appaar to meet code requi rements for percolation rate a�nd minimum <br /> depth to water �able or seasonal satur�ted zone. <br /> However, the propos�l calls for major grading of the drainfield <br /> aite to d uniform grad�ent of '�, '�elore trench construction. <br /> eas�d on the top�graphic survey provided, this will me�n re�noval <br /> of up to 8 vE:tical feet of m�terial in certain areas and placen��nt <br /> of up to 6' of materi�l in other are�s. Because of the granular , <br /> predominately non-plastic soils reportad on this site, this <br /> wholesale regrading should not pose a n�a�jor problem. However , <br /> this does credte a situ,Ation whete soil permeability aill be <br /> dffected to a degree. The possibility of plastic soils bei�g <br /> moved eround the site does exist. If grass or other vegetaiive <br /> covcr is allowed to m�t under fill areas, this could create a <br /> barrier to percolation. Hence, the City will require that <br /> additional percolation test.s be performed after the site isgraded � <br /> and prior to construction of the drainfield trenches. Also, all <br /> vegett+tive material must be removed prior to filling , to elimint�te <br /> matting . <br /> Should the resulting percolation rates indic�+te poorer <br /> permeability than the original design was b�sed upon, the system - <br /> must be resized accordingly. <br />