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Phase IV Weekly Summary No. 38 Page 2 track hoe or a Caterpillar 992 loader loaded severa1777 haul trucks. The material was then hauled to the Arequa Gulch fill area. SF materials were placed in horizontal lifts typically not exceeding 2 feet . in loose thickness. A Caterpillaz CS563C roller provided compactive effort, while a Caterpillaz water wagon provided moisture conditioning when needed or required. SF material would also be placed in the uncontrolled area to the north of the fill when needed. Ames ]oaded out selected riprap material from blasted rock shot azeas neaz UG-445 and UG-446 (D10 hill) by use of a Cat 375 track-hoe or a Cat 992 loader and several Cat 777 haul trucks. The material was then hauled to the Ames crusher area in Upper Arequa Gulch for further processing. Ames continued excavation and removal of the old Highway 67 asphalt and guazdrail located in the southern portion of Phase IVa. A Cat 375 loaded several Cat 777 haul trucks, which then hauled the waste to the "Sky Dump". Ames resumed clearing and grubbing within the Phase IVa footprint neaz the eastern portion of the Southern Access Road. Ames hauled the topsoil to stockpile and the slash to the "Sky Dump". Ames did not perform confirmation drilling or underground remediation within the Phase IVa azea during this reporting period. Phase IVb Ames performed excavation remediation activities for known underground workings UG-211(a,b), 212(a,b), 213, 216, 217, 218a, 252, and 519. If the workings were verified as shallow, a Cat D7 dozer and a Cat 563 roller would backfill the excavations and compact the shaft back to grade with SF. Otherwise, the shaft was left open for "Deep Shaft" remediation to be performed later. Ames performed cleazing and grubbing of topsoil and removed trees. A Cat D7 and a Cat 330 track- hoe removed trees and stripped topsoil from the southwestem azea of Phase IVb. Topsoil and slash were piled Locally for relocation at a later date. Ames conduced confirmation dril]ing on known underground workings UG-202, 203, 216, and the Ophir Tunnel. Ames began to excavate azound the retaining wall at the Cazlton Mill. Ames used Caterpillaz 330 and 375 excavators to remove material from around the retaining wall in preparation for demolition. Phase Nc Ames performed excavation remediation activities for known underground workings UG-234(c, e- k), 235, 239, 516, 517, and 518. If the workings were verified as shallow, a Cat D7 dozer and a Cat 563 roller would backfill the excavations and compact the material back to grade with SF. Otherwise, the shaft was left open for "Deep Shaft" remediation to be performed later. Ames performed clearing and grubbing of topsoil and removed trees. A Cat D7 and a Cat 330 track- hoe removed trees and stripped topsoil from the southwestem azea of Phase IVc, neaz the existing topsoil pile, west of the Phase IVc limits. Topsoil and slash were piled locally for relocation at a P~,.~~~~,~8o~a~-od:,.m~ Golder Associates Inc.