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<br />• March 2000 -23- 993-2099.150 <br />3.0 SITE SUBSURFACE CONDITIONS <br />3.1 Previous Site Investigations <br />Several site investigations have been previously performed to characterize the subsurface <br />features near the former site of the Carlton Mill. However, these studies concentrated <br />primarily on characterizing the tailing material eventually excavated in 1994 and 1995 as part <br />of the Phase II site preparation activities. In January of 1997, Golder issued a report titled <br />"Cresson Project, Phase /I Heap Leach Pad Expansion Design" in which the design for <br />Phase II was documented. This report included site investigation data focused on the native <br />and fill materials in the vicinity of the former site of the Carlton Mill. It was submitted to <br />the OMLR with a March 20, 1997 letter by CCBcV titled "Cresson Project; Permit No. <br />M-80-244: Technical Revision For Expansion of Phase 77 of Cresson Project Ual[ey Leach <br />Facility", (CC&V, 1997b) and approved by the OMLR in 1997. In July of 1998, Golder <br />issued a report titled "Cresson Project, Valley Leach Facility, Phase III Design" in which the <br />design of the Phase III VLF was documented. This report was submitted by CCBcV to the <br />OMLR as part of Amendment No. 7 (CC&V, 1998). Information pertaining to the Phase IV <br />VLF are summarized in the following sections. <br />3.2 Golder Site Investigation <br />Golder personnel performed a site reconnaissance within the limits of Phase III and <br />Phase IV from February 25 through February 27, 1998 to evaluate the foundation <br />conditions within the footprint of these areas. The geotechnical investigation included a <br />site reconnaissance and test pit program. Test pits within the Phase III footprint were <br />presented in the Amendment No. 7 document (CCBzV 1998). Three test pits were <br />excavated in the Phase IV area by Conley Construction (Conley) using a Case 9040 <br />• traclchoe. Golder personnel supervised and logged each test hole and test pit, and collected <br />samples where appropriate, for subsequent laboratory testing. <br />I:\94\'_099\FINAL REPORT3099MAIN2.DOC Golder Associates <br />