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B-L Brenneman Secondary Bulkhead <br /> Construction Certification Report <br /> Page 2 <br /> The rock contact perimeter area irregularity required to <br /> develop the design compressive strength of the concrete when <br /> subject to the maximum design thrust was determined <br /> empirically to be 4% to 10% of the area. The irregularity <br /> size required was 0 . 15 inch. These irregularities of the rock <br /> surface within the bulkhead were required by design to prevent <br /> the bulkhead from moving downstream upon application of the <br /> maximum design head. SGC committed to a minimum perimeter <br /> area irregularity of 101% . <br /> Quantification of perimeter area irregularity was accomplished <br /> by measuring x-sections within the bulkhead length and using <br /> the generated x-sections to quantify intrusive area verses <br /> total area between sections. This method provided an estimate <br /> of rock perimeter area i rregu lar i ty of 51% which exceeds the <br /> design and committed minimums specified. Pre-pour approval <br /> was required (and received) that this design assumption was <br /> met. <br /> The bulkhead dimensions and rebar placement met or exceeded <br /> all design specifications and assumptions. <br /> Specifically, these are: <br /> 1) a depth of 3 feet (distance between forms) . <br /> 2) an air side rebar placement of #101 at 12" x 12". <br /> 3) an air side rebar cover of 3 1/2" . <br /> 4) a water side rebar placement of #6 at 12" x 12". <br /> 5) a water side rebar cover of 3" . <br /> 6) a dimension of 9 feet for reinforced bending length (ie <br /> rib to rib dimension) . <br /> 7) a rebar-rib clearance of less than 6" . <br /> 8) a minimum rebar lap distance for splices or continuous <br /> bars. <br /> 9) a minimum perimeter area irregularity of 101% . <br /> d) Pumping of concrete and filling of forms as well as seven and <br /> twenty-eight day compression tests for concrete strength. <br /> The same concrete mix and additives were used for the B-L <br /> Brenneman Secondary bulkhead as was successfully used for the <br /> F-L Brenneman Secondary and Primary bulkheads except for the <br /> addition of additional mix water to increase slump. This <br /> change was necessary to increase the pumpability of the mix <br /> for transport by slickline the approximate 840 feet from the <br /> staging area to the bulkhead site. <br />