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Phase IV Weekly Summary No. 44 Page 3 003-2203 <br />known underground workings UG-257, UG-258, UG-270, UG-289, UG-498, UG-499, UG-500, and <br />UG-504. <br />Ames began blast drilling of underground workings within Phase Nc at UG-234a. Ames blasted <br />underground workings at UG-234a delineated by confirmation drilling on December 18a' at 16:30. <br />Ames continued placement of SF in Phase IVc at the saddle berm. Ames placed SF borrowed from <br />slope recontouring in Phase Nc near UG-234a. SF materials were placed in horizontal lifts typically <br />not exceeding 2 feet in loose thickness. A Caterpillaz CS563C roller provided compactive effort, while a <br />Caterpillaz water wagon provided moisture conditioning when needed or required. SF was also used to <br />backfill shallow workings UG-501 and UG-520. <br />(See Attachment A for approximate construction locations for all Phase IV azeas.) <br />Field Monitoring and Testing Activities <br />Golder observed construction activities associated with Phase IV earthworks. All construction <br />materials and soil materials were verified as suitable, and construction methods were in accordance <br />with project specifications. Removal of oversized and deleterious material from all fill azeas was <br />observed. Golder conducted temperature measurements of fill material prior to placement. No fill <br />was placed until fill temperatures met the requirements of the specifications. <br />Golder observed clearing and grubbing within the Phase N area. All available topsoil was removed <br />and deleterious material hauled to Upper Arequa Gulch. <br />Golder observed removal of old HWY 67 pavement. Pavement was hauled to Upper Arequa Gulch. <br />Golder observed construction of the 84-inch culvert at the south end of the Permanent Diversion <br />Channel. Golder observed that the material placed (CSP and Pipe Bedding Fill) met the <br />requirements of the specifications. <br />Golder observed placement of SF, SSF, and CSB. These materials were placed in accordance with <br />the drawings and specifications into excavated or open underground workings. Golder obtained <br />samples of SF, SSF, and CSB for laboratory testing. Materials supplied met specifications. <br />Golder observed and documented excavation and remediation activities associated with the Phase IV <br />underground working construction. Full time monitoring was given to excavation of underground <br />workings. <br />Golder observed and documented confirmation drilling activities associated with the Phase IV <br />construction. Full time monitoring was given to confirmation drilling of underground workings <br />including logging holes, mazking drill locations, surveying holes, and documenting underground <br />workings encountered. <br />rn~,~ rv. a ~~-,~,~ ~~ Golder Associates Inc. <br />