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F-L Brenneman Secondary Bulkhead <br /> Construction Certification Report <br /> Page 4 <br /> Initially 8 holes were drilled into confirmed rock . The <br /> approximate locations were; <br /> 1) left rib center at bulkhead center, 2) left rib-sill <br /> intersection at bulkhead center, 3) left rib-back <br /> intersection at bulkhead center, 4) back center at bulkhead <br /> center , 5) right rib-back intersection at bulkhead center, <br /> 6) right rib center at bulkhead center, 7) right rib-sill <br /> intersection at bulkhead center and 8 ) back center between <br /> bulkhead center and bulkhead face. <br /> All holes initially refused grout at 160-200 psi except the <br /> back holes #3, #4 and #8 . These holes were pumped with grout <br /> until it was evident that the grout was going out the back of <br /> the bulkhead . They were then let set overnight and redrilled <br /> into rock. They were again pumped with grout until grout was <br /> seeping from the front of the bulkhead . They were let set <br /> over the weekend and then redrilled into solid rock. This <br /> time each hole would not take grout and each hole was <br /> pressured to 200 psi . An additional hole #9 , was drilled to <br /> the back center between the bulkhead center and back bulkhead <br /> face as an additional check on complete perimeter coverage. <br /> This hole did not take any grout and was pressured to 200 psi . <br /> The bulkhead has been grouted around its perimeter to 200 psi <br /> and all indications are that the low pressure grouting was <br /> successful and complete. <br /> The F-L Brenneman Secondary Bulkhead construction meets or exceeds <br /> all design specifications and conforms to all design assumptions as <br /> reported above. In addition, the commitment to place limestone at <br /> the water side of the bulkhead has been completed . This was <br /> accomplished by placing 7500 lbs of crushed limestone against the <br /> water side of the bulkhead. <br /> The approximate center of the water-side of the bulkhead is at <br /> coordinates 17, 730. 34 N, 19, 178 . 36 E at an elevation of 11, 591. 90 <br /> feet. These coordinates are based on a coordinate system with USLM <br /> Moultrie being at coordinates 11, 964 . 00 N, 20,000. 00 E at an <br /> elevation of 12, 728. 73 feet. <br /> Larry Roger Perino, P.E . <br /> Colorado Registration #24138 <br /> cc: Patricia Nelson - CDH /A"c" . 18 . 19� L4. <br />