2013-03-14_REVISION - M1988112 - Laserfiche WebLink

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3.1.1 Compilation, Review and Assessment of Available Project Data Relevant San Luis Project information and records on the Tailing Facility pertaining to dam safety will be compiled and reviewed. The types of supporting technical information that will be reviewed may include, but are not limited to the following: • design and construction records (original and any modifications), including design reports, as -built construction records, and construction photographs, if available; • geotechnical and geological data (subsurface investigation reports, boring logs, laboratory data, geologic maps, site seismicity studies, etc.); • survey information, if available (e.g., dam crest surveys, impoundment -area surveys, drain outlet and storm -water outlet structure elevations, etc.); • instrumentation and monitoring data (piezometric data, drain outflow measurements, etc.); • previous engineering analyses and studies (slope stability and seismic deformation analysis, hydrologic studies and flood routings, etc.); and, • monitoring reports and related correspondence pertaining to tailing facility operations that could pertain to dam safety. The dam safety engineer will evaluate existing instrumentation and monitoring data and the project design and construction records to assess the adequacy of available information for making an initial dam safety assessment. Any missing data, analysis, or other information that is necessary for dam safety evaluation will be identified. If adequate piezometric data are available from the existing dam instrumentation, those data will be summarized and graphed. Historic data will be examined to determine whether or not there are any evident trends with time in pore pressures within the dam, its seepage collection under - drain system, or groundwater levels in the dam foundation below the liner. The typical magnitude, range of fluctuation, and any evident trending changes in flow rates from the under - drain collection system will be documented. A Project Data Report will be prepared that will concisely document relevant available project information. This report will include a description of the existing dam and associated facilities, the existing instrumentation and monitoring program, and the basis of engineering design of the embankment, impoundment, under -drain seepage collection, and flood diversion systems. This document is intended to become a permanent part of BMRI's project files, and should provide a useful reference tool that will facilitate subsequent dam safety inspections. The Project Data Report should be updated as additional data or updated engineering analyses become available over the life of the facility, or if modifications or dam safety improvements are made to the Tailing Facility. 3.1.2 Initial Site Inspection The dam safety engineer will conduct an initial site inspection of the dam and appurtenant structures including the dam embankment, impoundment and pool area, downstream drain outlet and collection facilities, and flood diversion facilities. Observed conditions will be documented by photographs and using an appropriate tailing facility inspection form (attached as Appendix A to this document). San Luis Project Tailing Dam Safety Inspection and Reporting Program Page 2 of 10