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r <br />1 <br />' San Luis Project - Plwe 11 Roue 1 I?zpansion Conawction Stator Report <br />' additional information to address these questions. This document has been prepared in response <br />to that request. <br /> <br />3.0 CONSTRUCTION PROGRESS <br />3.1 Earthwork <br />The earthwork contractor, Southway Construction, mobilized to the site on July 22, 1993. <br />' Initial construction began with clearing, grubbing and topsoil removal from the impoundment <br />expansion area and regrading of the interior slopes of the south dike adjacent to the south edge <br />' of the permit boundary. Construction of the north dike, located between the milllcrushing <br />facilities and the tailings disposal area, has been completed to the ultimate crest elevation of <br />8620 ft. These dikes are depicted on Figure 1 which presents the facility layout. <br />On August 23, 1993 BMRI received written approval for construction of the first 10 ft of <br />' embankment fill. Fill placement commenced on September 3, 1993. Initial construction <br />involving the first 10 ft of fill was completed on September 11, 1993. On September 7, 1993 <br />' settlement mazkers were installed in the raise fill and daily readings were initiated. During this <br />period and a three week waiting period required by the Division, settlement mazkers installed <br />' beneath the crest of the embankment raise following placement of the initial lift of fill, 3 ft+/-, <br />have shown a maximum settlement of 0.5 ft which occurred during construction and no <br />significant differential settlement. Placement of fill in the embankment raise resumed on <br />October 4, 1993, but was terminated on October 8 after completion of one three foot lift of fill <br />and partial placement of a second three foot lift. Settlement marker locations and plots of the <br />settlements recorded are included in Appendix A. No signs of excessive settlement of the <br />tailings along the upstream tce of the raise, such as heaving or cracking, has been observed. <br />' The settlement markers have been and will continue to be surveyed daily during conswction. <br />The daily surveys will continue after construction until there is no movement (within <br />instrumentation limitation) for three consecutive days and will be monitored weekly thereafter <br />until no movement has been recorded for four consecutive weeks. <br />Five standpipe piezometers were installed beneath the crest of the main embankment starting <br />September 23, 1993 and completed on September 29, 1993. These piezometers were installed <br />' October, 1993 4 SRK Project No. 14725 <br />