2008-02-06_PERMIT FILE - M2007069 (2)

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DRAFT FOR REVIEW • Evaluate the stability ofi the canal embankments for proposed gravel pit excavation slope configurations. SCOPE OF SERVICES Our scope of services on this project will inGude field exploration, laboratory testing, engineering analyses, and a summary report. A detailed exp(anatian of our services is provided below: Field Exploration • Notify the Utility Notification Center of Colorado prior to drilling on the site. • Drill 8 borings at critical sections along the canal. The borings will be located at the approximate loca#ions shown on the Proposed Boring Location Plan attached to this propasal as Figure 1. Each boring will be advanced to a maximum depth of approximately 50 feet belaw the existing ground surface. • Lag and sample the soil{s) during drilling. Sampling will be performed at 5- to 10- foot intervals. Samples will be taken with a standard 2-inch O.D. split spoon sampler or modified California sampler. • Convert the borings into groundwater monitoring piezometers. The piezometers will be constructed of PVC sleeve, sealed at the ground surface to help prevent introduction of surface water, and sealed at the top using lockable "J" plugs. • Measure the groundwater depth at each boring location at the time of drilling. • Survey 4 sections roughly perpendicular to the canal alignment and bisecting our borings for use in generating subsurface/surface profiles for seepage and stability analyses. Surveying will be performed using basic rod-and-level and handheld GPS equipment for vertical and horizontal locations, respectively. Vertical measurements will be made relative to the ground surface at the baring locations, and will not reference any horizontal or vertical datum. Laboratory Testing • Perform laboratory testing of samples collected to better evaluate the engineering characteristacs of the soils. Laboratory testing will be limited to: o Classification {sieve analysis and plasticity index) testing. o In-situ moisture content and unit weight testing. Engineering properties for seepage and stability analyses will be estimated using empirical correlations to penetration tests performed during sampling and soil classifications obtained from our laboratory testing. Engineering Analyses • Review published geotechnica! and geological data pertinent to our evaluations. • Evaluate two to three critical sections for seepage based on the information gathered as part of this study and the proposed final grades after mining. 06501 PROP/C5PSP035 Page 2 of 5 January 30, 2008 Copyright 2008 Kleirtfelder KLEiNFELDER 4$15 List [Drive, Unit 115, Caloradn Springs, CO 80919 (719) 632-3593 (719) 632-2648 fax