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rock backfill in tunnels <br /> grout block openings <br /> Seal wall <br /> 60 " <br /> 48 inch to sides <br /> Concrete of tunnels <br /> PVC pipe block <br /> wall <br /> 12 <br /> Existing <br /> Concrete footing ground <br /> Plan View <br /> Side View <br /> Grout <br /> ® btwn_ No. 5 rebar in openings <br /> blocKs <br /> No. 5 <br /> No. 9 wire rebar <br /> tie No. 9 wire ties @ 24" <br /> 3 vert. and horiz. <br /> �748 inch PVC pipe <br /> No. 5 rebar C Key footing 12" min. into <br /> competent rock. Sae Bid if <br /> rock is > 3' blw_ grade <br /> 2, 4" <br /> Figure 2_ 60 Inch Double Wythe Block Wall <br />