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Installation Instructions for Snap Seal Inclinometer Casing <br /> 6.4 Grouting <br /> Properly mixed grout must be thin enough to pump, but thick enough to set in a reasonable amount of <br /> time. Ensure that the grout is free of lumps. If the mixture is too watery, it will shrink excessively, leaving <br /> the upper portion of the borehole un-grouted. Also, avoid the use of grouts that cure at high temperature <br /> since these may damage the casing. <br /> Begin to tremie in grout as directed by the engineer. Grouting, via a high shear filtered grouting machine <br /> is recommended to avoid problems with lumps obstructing the tube. <br /> Observe the water meniscus in the casing as an indication of casing collapse, or grout ingress (i.e. if the <br /> water in the casing rises, grout ingress can be assumed). Ensure that differential pressures are kept to a <br /> minimum, as the casing will collapse at 240 PSI differential. <br /> Deeper boreholes will require a stage grouting procedure, with appropriate stages dependant on <br /> borehole water level, grout density, grout pump type, etc. <br /> Note <br /> Proper grouting of inclinometer casing is crucial to a successful inclinometer installation. The on- <br /> site engineer is required to have experience and can work with the drill crew on the proper <br /> mixture for the grout. Grout consistency is very important to ensure proper curing and to avoid <br /> separation of the solids and water. Grout must also have the proper viscosity which will enable it <br /> to be pumped easily. <br /> In summary, grouting needs to be performed by experienced personnel, site conditions vary to the extent <br /> that each inclinometer installation is unique. Good judgment by on-site personnel and previous <br /> experience is the key to a successful installation. <br /> 11 <br />