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Third Party Oversight 4 Water, Watte & Land, Inc. San Luis Mine January 10, 1993 2.0 REVIEW OF DESIGN AND GEOTECHNICAL ISSUES 1 Pertinent documents concerning the design and construction of the current facility and the planned expansion to the tailings impoundment system were reviewed prior to WW's initial site t visit. The focus of the review was on the key geotechnical issues associated with the Raise I Expansion, and how the expansion related to the intent of the original Phase I and Phase II designs. 2.1 DESIGN REVIEW Our evaluation of the design for the expansion reflected our review and understanding of ' documents concerning design, construction, and monitoring of the original (Phase I) embankment i and the Phase II Raise I Embankment, previous site exploration work and test ng, site and ' construction material conditions, and tailings disposal procedures at the time of our initial site visit. Information sources utilized in our initial evaluation are listed below. ' • Technical documents reviewed prior to the initial site visit: ' 0 112 Permit Application for the San Luis Project, (BMRI, 1989). 0 1 12 Permit Application Amendment for the San Luis Project, (SRK, 1989). o San Luis Project Permit Amendment Adequacy Responses, M-88-112, (SRK, 1990). I' o San Luis Project Tailings Impoundment Construction Report, (SRK, 1941). o San Luis Mine Phase II, Raise I Design Report, (SRK, 1993a). o Construction Status Report, San Luis Project Tailings Disposal Area, Phrase II, Raise I, (SRK, 1993c). ' • The initial site visit and meeting with DMG and BMRI staff on October .,8, 1993 and additional meetings and conversations with DMG staff. ' 1 • Geotechnical monitoring data collected prior to and after initiation of const•uction of the Raise I Embankment. t • Various correspondence, submittals, and revisions pertinent to the design and intent of the expansion reviewed prior to the site visit. ' • Review of laboratory and QA/OC test results conducted after initiation of construction and prior !to initiation ~ t third-party oversight work. w~ ~ Q r1~Q ~ -~Pf ~" re{r/-~i r~.x rr ~.x. ~ a~P!5~ r~Vrnw~°.. ? 2.2 DESIGN INTENT 1 Based on WWL's review of the documents listed above, our understanding of the design intent of the tailings disposal facility pertinent to Raise I Expansion is summarized it the following ' paragraphs. The tailings disposal facility is a valley impoundment with an embankment constructed across the valley and tailings contained in the lined portion of the valley above the embankment.