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1100318 R0T0 0811 JRW1 35 <br />of the station location relative to the Pikeview Quarry and plots of the data from this gage. A <br />comparison of Mountain Shadows Evergreen Rain gage data was made with data collected <br />from a rain gage installed at the site as part of this investigation at Pikeview Quarry. The site <br />gage was read at relatively regular intervals. <br />The comparison indicates that generally, the Mountain Shadows Evergreen Rain gage data has <br />recorded more frequent daily rainfall than the site gage. Comparison of the Mountain Shadows <br /> Evergreen Rain gage data and the groundwater levels is contained in Appendix 44. The <br />comparison indicates a rapid response of the Area H piezometers and P-1 to rainfall and decay <br />at variable rates of groundwater levels with time. Drilling at P-1 encountered voids consistent <br />with dissolution voids in the limestone; the intermittent measurement of water at this location is <br />consistent with the rise of water in the piezometer from rain events and relatively fast, though <br />not instantaneous, draining of water through the now interconnected voids and more permeable <br />underlying sandstone. <br />5.2.7 Surface Topography <br />A topographic survey of Pikeview Quarry was performed as part of Exponent’s investigation. <br />The survey included performing a photogrammetric survey of the quarry and measuring surface <br />elevations at various locations, including but not limited to, drilling locations. The survey data <br />accurately reflects the condition of the quarry at the time of Exponents investigation. Based on <br />review of conditions observed during Exponent’s inspection and documented in photographs <br />contained in Appendix 3, Appendix 6, and Appendix 8, the ground surface conditions in the <br />topographic survey accurately reflect the conditions of Area H and the quarry west wall on <br />December 2, 2008 with two exceptions. The exceptions are the access ramps on the easterly <br />side of Area H and the grading at the north and northeast end of the quarry. This grading was <br />performed, in part, to permit equipment access after December 2, 2008. The topographic <br />survey, spot elevations, and aerial photograph are contained in Appendix 46.