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Y <br /> , a ���`�,.��d. � d. h r � § r P � r s t s iA . � '�. � ::�, . .. <br /> Y f i 3 q� Z !�� ���, #r.h�, 'J �i �,. : .�..�� x+'�m�y�'' 'r}`� ��, i 'S� a .. 1, ��..:a ;n� ,��'�cse � a�a <br /> � �r'";ft ',s �N ,��; .�.,.�^ .sa� F � i a;�' ,t 'Y � .� Y`�� �x��� �µ��.� S L 4 'gi��+W:���'+� q�k'�tr ��'�x�-,,.�'zfF�;�c.�,5,�� 3 .,.���n, <br /> yp ��T ' 1'�•� �,���' 4 � 5�3.��. .:.� fi1�i'�4 �(i.�.�h +-d�� ��1.,3 y. _ �.�Y,A y`. �r ��'.. <br /> y r � ,� �.+ r �. t r�. �f"tYr �t t fi t� � � p i <br /> � ' d t �k� t F � i t �Sl 4 e f.q 7 r , ,* � -+�ti�.' 3 � 'A :1 <br /> -''�Y�+ k .w e 1� �'7 '�' � �.;,"' � .e.�g F �a5y �.�. 1 .. t y,��1: i ,�� �M } � ��:. <br /> :,}a �r a c+M�'� "�r �'r ti ��'� u7�? r1: �' r t g b ta�r�..��Ik 7 -i�s <br /> tf;^ t � a� t6'��c M?a. � ' ��t} �',�`}.W ^r�jx'3m ��� ; s��'�.sj�:�t�i ^�����'�rL�w'�����'.�£,���� �` F_: <br /> ��� � � �',� �'''� �_ �� r . �,�� '� ` <br /> .Fwt«�aa�!� ��`��� ' r�rRe''`' rrn.y a ' ' ,�: �` �, <br /> T y�y� ' <br /> �'y. , ,� �` .�+ M1� ���,i ^r: � 4� + $y <br /> �� v„� pi�M;aw,� W����� �� ,���Lt!,`* Z �af _�' R k! a �""� ,`c�a ��� �,. <br /> '0�4' +"�,'e �r -i'g' F,v g� ��.�t����" � � #� � . f_ Y ���.. <br /> �i��; ii' r ''� <br /> -f <br /> i 'I ' ` <br /> �` .. .i <br /> � 11,. <br /> . <br /> �;;�' , The total arca selected for the mound, including that under thc dik�,shall be roughened in on�3er , <br /> to thoroughly break up any existing sod laycrs and to provide a suitable transition zone betwecn <br /> the original soil and sand laycr of the mound. The uea shall be roughened only whon the <br /> moisture contcnt of the soil 8 inches below the surface is drier than the plastic limit. <br /> s <br /> Sutface preparation or roughening may be performed with a mald board plow, a disk plow, or <br /> ' a back hce using only the teeth. Mold board plow furrows shall be at least 8 inches deep,shall <br /> '�� be thrown up slope and shall run perpendicular to thc slope. T'hcre shall be no dcad furrow <br /> under thc mound. <br /> Disking may be used for surface preparation as a substitute for mold boazd plowing in soils <br /> having percolation rates faster than 15 minvtes per inch (sandy loam) in the top S—inch depth. <br /> .x <br /> Back hce teeth may be used to roughen the soil surface and brcak up the sod layer. Care must <br /> be taken so as not to compact or puddle deeper soil laycrs. In no case shall any surface soil be <br /> excavated and removed frcm the area. <br /> t3 <br /> Mound Construction shall proceed immediately after surface preparation is complcted. Every <br /> ,M1f. <br /> effort should be taken to prevcnt rain from falting on thc prepared soil surface. <br /> CONSTRL'CI'fON MATERIALS AND PROCEDURES; DISTRIBUTION OF EFFLUENT: <br /> A minimum of 12" of soil defined as sand shall be placed where the filter material is to be <br /> locatcd. �crawler tractor with a blade or buckct shall be uscd to move the sand into place. At <br /> least 6 inches of sand shall be kcpt under the tracks to minimize compacting of the plowed layer. <br /> The sand layer upon which the filter material is placcd sha{l be Icvel. <br /> Sand is defined a5 a soil texture composed by weight of a least <br /> ,ri 25 percent of very eoarse, and medium sand varying in sizc from 2.0 to 0.25 mm, Iess than 50 <br /> percent of fine or very fine sand ranging in size betwccn 0.25 and 0.05 mm, and no more that <br /> 10 percent of particles smaller that 0.05 mm. <br /> ;� A minimum depth of 9 inchcs of filtcr material (rock) shall be placed on thc sand laycr prior to <br /> :,�. <br /> installing the distribution pipe. <br /> Filter material is dcfinc�� as clean rock, crushed ignoous rock or similar insoluble, durable and <br /> '`� decay—resistant material free from dust, sand, silt or clay. The siu shal[ range from 3/4 inch <br /> << <br /> diameter to 2 12 inc}+ diamcter. <br /> 'r PAGE 3 <br /> ,, ;� <br /> a���;. <br /> ;,#,. <br /> '-�,.�� <br /> ��� <br /> .�;„�: <br /> '�'z'�;�t •F <br /> � �x� 'i <br /> ,�� �•.� �y <br /> 'x <br /> �-�N � <br /> ��� ,,�p y� . , <br /> �qry� ���t'�S'c� `;'4���������� .n �i t i o�C' ,�iii t �'� L is� �w �,. , y '*.t� �a R '�� .�` . <br /> � ffi':; � <br /> �.�a`tTk d kk3��+r��t a �, t ay,."r ,�m � �% '�`��'9A.� 3 9 �� 4��.�� �4:i " $y .S � y, �Fqkh�7�� *�il�' `k�, <br /> � ,�^a r :�4 x s'0+ 9 �3,�� v� ��i�> .�e r r';.4 r l 3�� �.. cuf4 �. y,��,�^�, �+^.�e,°�'T ia�L. I }., � 3 r.�I'v� � +5��f x.r. <br /> - '�+��� ,yd,7�t s � 9'p} ' w �" r V y °,}. � .e�,��`i. 1�; ' +. `r�f a�. '6.kyu <br /> �iy,*'"3� � �^�� 1�`:.� i i��"*� e N h_, 3" 't. . � �. . � _ I�,. t.d r t � � h_�� � :3'� �� ?�uY�y�� . �, q� �� t ��. 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