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<br />A,1J.Jti1N l"aur;m~ - Tay/(),. RQ/dmc~ <br />c:NcA r,wall,iItltHt <br />S4tt~"'hr 10, 19'., <br />Bfi No. 115"'..,.J198 <br />Pa8e ND.1 <br /> <br />'3 <br /> <br />is B' from the surface. A cushion of 7' - 8' r sand between the foundation and clay is ordinarily <br /> <br />sufficient to prevent it from affecting the stru <br /> <br /> <br />A sinkhole is often accompanied by 8 no of depression in the groundwater. One indication <br /> <br />of successful sinkhole repair is the elimination '0 this cone of depression. We placed three monitoring <br /> <br />weUs~ two near the house and one near the g rage and found no cone of deprcs.'Jion. This wouJd <br /> <br />indicate: that the sinkhole Is no tonser active. <br /> <br /> <br />We believe th~ repairs of August. 1991, to be supplemented. The grouting seems to have <br />worked but the structural repairs, though stan d, are too llmited. The pin piles on some walls are <br /> <br />~ much as 15' apart. the north wall has only 0 e pin pile. Our customary recommendations specify <br />a maximum dIstance between pin pilea of'6', AI hough Parts of each wall are supported by piles. the <br /> <br />remaining portion of wall without pin piles i less rlgJdly supporteu creating an opportunity (or <br /> <br />differential movement. <br /> <br />Iks.t.mtuendatlont <br />J . . Incorporate the. existing pi1e~ into a <br />t Fill the wall. solid with grout. <br /> <br /> <br />oreed. grade beam. . <br /> <br />These reconunendations will strengthe the footings and walls and supplement the existing <br /> <br />pile supported foundation. They do not. howeve address the interior slab. The only way to properly <br />repair the floor slab is to remove it, inspect the !Oil and replace it if neceswy. and pour a new <br />