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F)l <br /> monitoring requirements will be directed by the specifications. <br /> Comments pertaininq to the Kleinfelder Fill Slopes Engineering Analysis <br /> (Attachment B) <br /> 10.Two cross sections analyzed for slope stability, but it is not clear what <br /> the lateral extents of the proposed fill placement will be for the final <br /> site grading. <br /> o Do the two cross sections adequately evaluate the entire extents <br /> and aspects of the final fill placement sections, or will additional <br /> analysis be needed? <br /> Response: <br /> The geotechnica/report describes the objectives of the study as <br /> characterizing existing fill slopes and materials; evaluating the <br /> engineering properties of the fill slope materials; developing the stability <br /> model for the final slope configuration; and developing criteria for fill <br /> slope design. Because the fill materials at the site are all derived from <br /> the same sedimentary overburden rock, the referenced sections should <br /> be representative of all existing fill slope geometries and material <br /> properties and the developed slope design criteria should be appropriate <br /> for all existing fill slopes at the site. <br /> 11. Per Section 6.5, "Critical failure" defined as more than half of the slope <br /> height fails. <br /> o Is this definition for the fill section or entire slope height? <br /> Response: <br /> The geotechnica/report states that slope failure was considered critical <br /> when at least half of the slope height failed. This height includes the <br /> overall fill slope height of 150 feet, but must include more than one bench <br /> height of 50 feet. <br /> 12. Per Section 6.4, the stability analysis does not include pore water <br /> pressures (ie, saturated conditions). <br /> o How are the seep areas and perched water areas identified <br /> in the quarry addressed? w. <br /> Response: <br /> The geotechnical report, under Section 6.5.2, evaluates the stability of ~ <br /> the fill slopes during an extreme rainfall event that assumes the base of <br /> the fill would become saturated during the 100-year rainstorm event. <br /> 10 <br /> hdrinc.com <br /> 1670 Broadway, Suite 3400, Denver,CO 80202-4824 <br /> (303)764-1520 <br />