2004-10-18_REVISION - M1980244 (25)

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October 2004 -9- 043-2170 • approximately ] 0 feet below the fmished surface Bade. The surface of the CSB was compacted using the shovel from a CAT 3306 excavator. A 3-foot minimum CP was cast into the shaft and allowed to cure for a minimum of 7 days. A minimum 7-foot thick layer of CR was then placed onto the CP. SF was then placed to the final Bade, as needed. in some cases, the excavation did not require placement of CSB prior to placement of the CP and CR. For open workings where the depth to competent bedrock was Beater than 7 feet to the final SLF subgade surface, the excavations were backfilled with CSB to 3 feet below the soil bedrock interface. The surface of the CSB was compacted using the shovel from a CAT 3306 excavator. A 3-foot minimum CP was cast into the shaft and allowed to cure for a minimum of 7 days. A minimum 7-foot thick layer of CR was then placed onto the CP. After the CR was allowed to cure, SF was then placed to the final grade, as needed. In some cases, the excavation did not require placement of CSB prior to placement of the CP and CR. • For collapsed workings extending deeper than 25 feet and where the depth to competent bedrock was less than 7 feet to the final SLF subgade surface, the collapsed materials were excavated to a depth of 25 feet below fmished grade. The excavations were either backfilled with CSB to approximately 10 feet below the finished grade or shaped for the CP at a workable depth below 10 feet. The surface of the CSB or existing material was compacted using the shovel from a CAT 3306 excavator. A 3-foot minimum CP was cast into the shaft and allowed to cure for a minimum of 7 days. A minimum 7-foot thick layer of CR was then placed onto the CP. After the CR was allowed to cure, SF was then placed to the final grade, as • needed. in some cases, the excavation did not require placement of CSB prior to placement of the CP and CR. For collapsed workings extending deeper than 25 feet and where the depth to competent bedrock was greater than 7 feet to the final SLF subgade surface, the collapsed materials were excavated to a depth of 25 feet below finished grade. The excavations were either backfilled with CSB to approximately 3 feet below the soiUbedrock interface or shaped for placement of the CP. The surface of the CSB was compacted using the shovel from a CAT 3306 excavator. A 3-foot minimum CP was cast into the shaft and allowed to cure for a minimum of 7 days. A minimum 7-foot thick layer of CR was then placed onto the CP. After the CR was allowed to cure, SF was then placed to the final Bade, as needed. • Shallow surface pits that were less than 25 feet deep below the final SLF subgade surface were excavated to bedrock or pit termination. The pits were then backfilled with compacted SSF and SF to the final subgade elevation. In some cases, shallow surface pits were completely removed during slope re- contouring and required no further remediation. • Golder Associates