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amec? <br />Earth & Environmental <br />inch CPe pipe The work was performed per CEntry specifications. Compaction of the Hilfiker <br />Wall Backfill was tested using a nuclear density gauge in accordance with nuclear methods <br />ASTM D-2922 & 3017. Compaction test results met or exceeded the minimum requirement of <br />95% of Modified Proctor (ASTM D-1557). Moisture contents were near optimum. Work was <br />delayed on Thursday and Friday due to rain. <br />E) Miscellaneous <br />No work performed during the week. <br />II) Underground Working <br />A) Drilling <br />No work performed during the week. <br />B) Mine Shaft/Stope Remediation <br />Underground workings 2036 and 2040 located at Transfer Station #5 were excavated and <br />backfilled with Coarse Shaft Backfill using one CAT 320 excavator. <br />The initial lift was compacted using the back of the excavator bucket. The final lift was <br />compacted using a CAT vibratory smooth drum roller a minimum of four passes over the entire <br />surface to 3-feet below finished grade. Two layers of Geogrid were placed spanning 5-feet each <br />side of the opening. A minimum 6-inch layer of Select Structural Fill separates the two layers of <br />Geogrid as per the Remediation Plan dated 7 April 2009. AMEC observed the remediation process <br />on a full time basis. <br />Nuclear density tests (ASTM D-2922 &3017) were performed on the Select Structural Fill layers. <br />Test results were greater than 95% of Standard Proctor (ASTM D-698). Moisture contents were <br />near optimum. <br />Underground working 2016 (connected to the Tornado Shaft) located within the shoulder of LOB <br />Delivery Road was exposed due to site grading and rain. The area was already flagged off and will <br />be remediated when the weather improves. Underground working 2030 (Raven Shaft) which was <br />previously flagged with lath and safety ribbon, showed no further subsidence from the rain. <br />C) Lateral/Slot Remediation <br />No work performed during shift. <br />III) Storm Water Management Structures <br />A) Best Management Practices (BMP) <br />Silt fencing has been put in place and Best Management Practices are being observed throughout <br />the LOB project. <br />B) Roadside ditch <br />A Komatsu 800 excavator has excavated the roadside ditch between stations 17+00 (+/-) to 23+00 <br />(+/-). Excavated material was stockpiled on the roadway for future haul to the designated area. <br />C) LOB Stormwater Culverts <br />Sheet 3 of 9 <br />LOB Weekly Report WE 05.23.09.D