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amec <br />Earth & Environmental <br />G) Miscellaneous <br />Placement of less than 1 cubic yard of transit mixed concrete was placed on the transformer pad <br />for the future millwright shop. 3-concrete cylinders were cast for compressive strength testing. <br />Placement of approximately 34 cubic yards of transit mixed concrete was placed on the retaining <br />wall footing located in conveyor transfer station 4. <br />II) Underground Working <br />A) Drilling <br />No work performed during shift. <br />B) Mine Shaft/Stope Remediation <br />Underground working 2036, located within the planned LOB conveyor transfer station 5: Work <br />continues to expose the remainder of the shaft and stope as the cut advances down slope and up <br />slope from the existing underground working. Shaft and slope is backfillen as the cut advances. <br />Underground working 2030 (Raven upper tunnel), located within the LOB Delivery Road: As the <br />cut continues, AMEC recommends backfilling the shaft (for safety) with 24-inch minus rock. <br />Therefore, it is anticipated the shaft will be removed once the LOB Delivery road is nearing final <br />grade. <br />Near Station 34+00 (+/-), right of centerline on the LOB Delivery Road, a shaft was found at the <br />existing toe of the cut slope. This appears to be another underground working, which has not been <br />documented. Ames survey will locate the shaft. The shaft was backfilled with rock for safety and <br />is marked with lath and flagging. Based on information provided by Ames, the shaft is within a <br />cut area and may be removed once the road is completed. <br />Underground working 2039: Full-time observation during the week on the placement of three <br />layers of geogrid and select structural fill. Work conforms to the Remediation Plan prepared by <br />AMEC. To date: 3860 square feet of geogrid and 119 cubic yards of select structural fill have <br />been placed and tested for compaction. Test results by Nuclear Methods (ASTM D-2922 &3017) <br />exceed 97% of Proctor density, (ASTM D-698). Moisture contents have been near optimum. <br />C) Lateral/Slot Remediation <br />(i) No work performed during shift <br />III) Stormwater Management Structures <br />A) LOB Stormwater Culverts <br />No work performed during shift. <br />B) Roadside ditch <br />No work performed during shift. <br />Sheet 3 of 11 <br />LOB Weekly Report WE 04.18.09.13