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.�SCRDE GEOTECHNICRL TEL�206-820-6953 Rug OS•94 <br />��qD� GEOTECHNICN.L INC. <br />August S, 1994 <br />1`:40 No.004 F.13 <br />7ob No. 9407-04G <br />�Xposed soils along the northern area b�oW �° house. A1oeB th� foundation petimeter and <br />across the backya*d� the P�asp� �o�d ��ched in a minimum of one (1) foot and sealed wiU� <br />a bentoniu mixcure• Tho liner should n�a C0o p� pile�fo ndation footingsO rOthe 4°�k <br />the infiluadon of any waur. Any p� <br />should be catefully sealed i" a��Y �10� m��. We recommend that we obaen'e <br />pi�cema�t of the liner and appro�� Y�r liner material• <br />A�llecWr dcain should bo Pla� ac t1�e lower cdg� of the liner to collxt �unoff and carry it <br />to � saitable oudet. <br />A french dnin should be constructed approximauly ta► (lU) feet south of the line'; vench xal. <br />The [rench drain should be ��nsuuct�d witl► a minimum 196 gtadient. ��a t0 ��� <br />pmper subsurface disinaB� in the trench� care must be � with gcading op�radons to ensure <br />a uniform s1oPe of d►e tre"ch aubgrada The d�a►na6° �ch should conform w t1w aPPr°��� <br />dima►sions shown in Appa►dix D. <br />In order W provide efficient dcaine�8e� w� �Ommend th°t the dra'n�6° �nch bacldill materiel <br />be Clean pea Btavel or material which ca►forms to the follawing gradation: <br />C�ev IZG <br />3 inch <br />114 inch <br />N200 <br />. � � r. �• <br />1 <br />25 to 100 <br />0 to 1 112 <br />The drain lines should be a minimum eightxn (18) inches in depth beloW Su�� °levation. '17u <br />10 <br />