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additives may be added to the cement grout, with an average of not more <br /> than 10 percent additives when four percent accelerators are used. In the <br /> cementing of the upper 100 feet of the final casing only, four percent <br /> bentonite may be added. In the lower 100 feet of the final casing, <br /> cementing must be attempted with no additives . Should this prove to be <br /> impractical , a mixture up to 12 percent bentonite maybe used if approved <br /> by the SJRWMD in advance . Use of greater than five percent bentonite <br /> must be pre-approved by the SJRWMD . <br /> 3 . 1 .3 The CONTRACTOR shall utilize a standard mud balance to measure and <br /> verify cement grout density as requested by the ENGINEER. <br /> 3 .2 Additives : <br /> 3 . 2 . 1 The use of special cements or other admixtures (ASTM C494) to reduce <br /> permeability, increase fluidity and/or control set time and the composition <br /> of the resultant cement grout must be pre-approved by the ENGINEER <br /> and the SJRWMD. <br /> 3 . 2 . 2 Consistency and method of mixing shall be reviewed by the ENGINEER <br /> prior to grouting. <br /> 3 .2 . 3 Furnish all bentonite required for cementing in the proportions specified <br /> in the Proposal and as directed by the ENGINEER. <br /> 3 .2 .4 Fumish other cementing additives formulated specifically for well <br /> cementing as required by the ENGINEER. <br /> 3 . 2 . 5 A high shear mixer shall be used for additives and totally hydrated to <br /> smooth slurry before cement is added. For each grout batch, about 5 to <br /> 10 percent of the mixing water shall precede the other components. <br /> 3 .3 Placing : <br /> 3 . 3 . 1 Prior to any cementing, the CONTRACTOR shall use the caliper log to <br /> calculate cement requirements . <br /> 3 . 3 .2 The CONTRACTOR shall submit a cementing plan for approval to the <br /> ENGINEER, 24 hours prior to the first stage of cementing. The <br /> cementing plan shall detail estimated cement quantities for length of <br /> casing to be grouted, the nature of the mix cement slurry including weight <br /> per unit volume (density), proposed cementing schedule, expected <br /> GROUT <br /> 02090 - 3 <br /> C:\DOCUME— I \mikeh\LOCALS- 1\Temp\Temporary Directory 16 for IRC wells Div Imp\OS-IRC_Grout.doc <br /> 10/17/07 <br />