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INING & ENVIRONMENTAL SERVICES LLC <br />the concrete and the inception of the contact grouting, to allow the concrete to be <br />past the majority of its shrinkage curve before the grout injection. <br />The Steve adit bulkhead was pumped on December 19~h, 2007 and the Pierce <br />adit bulkhead was pumped on December 20, 2007. Contact grouting began at <br />the Steve adit on January 22, 2008, and at the Pierce adit on January 29 h, 2008. <br />3.4 Contact grouting <br />Grouting was performed in general accordance with the grouting plan (Tab 11) <br />and grouting specification (Tab 12). This grouting was performed using both <br />cement-flyash mixtures and with Nittetsu superfine grouts. Additional information <br />about the Nittetsu superfine grout is located at Tab 13. <br />• <br />Contact grouting is the grouting of the space left between the concrete bulkhead <br />and the adjacent rock surfaces after the concrete shrinkage period. <br />• Grouts were mixed using ahigh-shear "colloidal" mixer, and then transferred to a <br />paddle mix tank. The grouting system was a recirculating type, where the grout <br />is pumped from a constant displacement progressive cavity pump, through to a <br />Figure 8: Typical array of contact grouting pipes <br />