PERMFILE125881 - Laserfiche WebLink

Home Browse Search

Phase IV Weekly Summary No. 51 Page 3 Ames performed excavation remediation activities of known underground workings UG-508, UNK-08, and UNK-10. These workings were observed and verified to be a "Deep or Shallow Shaft" as defined in the drawings and will be remediated accordingly. • Ames continued placement of Coazse Shaft Backfill (CSB) into "Deep" underground working UNK-08. Ames resumed placement of Concrete Plug (CP) concrete into "Deep Shaft" UNK-08. Ames placed three feet of concrete in accordance with IFC Drawing 12, Detail 1. (See Attachment A for approximate construction locations for all Phase IV azeas.) Field Monitoring and Testing Activities Golder observed construction activities associated with Phase IV earthworks. All construction materials and soil materials placed were verified as suitable, and construction methods were in accordance with project specifications. Removal of oversized and deleterious material from all fill areas was observed. Golder conducted temperature measurements of fill material prior to placement. Golder observed recontouring of the Phase III ore slope. Ore was regraded to approximately 4H: ] V and at no time was allowed off of the existing liner system. Golder observed construction of the Primary Underdrain and Secondary Underdrain in Phase IVa and Phase fVb for trench dimensions (5' by 3' and 4' by 2'), slope (minimum 1%), geotextile (12 oz.), UF, geotextile overlap (2'), and SSF. Golder observed concrete placement at the 84-inch wingwall footing. Prior to concrete placement Golder observed form dimension and reinforcement spacing. Golder observed concrete testing performed by Ground Engineering for the proper slump (2"-5") and air entrainment (5%-8%}. Compressive strength samples were taken by Ground Engineering to determine the 28-day compressive strength of the concrete placed. Golder observed placement of Soil Liner Fill at the LOB extension for subgrade prepazation, materials placed, and moisture content. Golder observed placement of CSB, SSF, and CP. These materials were placed in accordance with the drawings and specifications into excavated or open underground workings. Golder previously obtained samples of SSF, CP, and CR for laboratory testing. Materials supplied met specifications. Ground Engineering conducted field testing and sampling of CP concrete as per specifications, and will supply 28-day strength results. Golder observed and documented excavation and remediation activities associated with the Phase IV underground working construction. Full time monitoring was given to excavation of underground workings. Golder observed placement of geogrid at UG-494. Geogrid was placed in accordance with the drawings and specifications over the designated azea. Phue IVa 51 April]-20 doc Golder Associates Inc.