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Proposed <br />Slurry Wall <br />Station <br />Ground <br />Surface <br />Elevation <br />Estimated <br />Depth to <br />Top of <br />Weathered <br />Bedrock <br />Estimated <br />Elevation of <br />Top of <br />Weathered <br />Bedrock <br />Estimated <br />Depth to <br />Top of <br />Fresh <br />Bedrock <br />Estimated <br />Elevation of <br />Top of <br />Fresh <br />Bedrock <br />Estimated <br />Depth to <br />Bottom of <br />Slurry Wall <br />(Key) <br />Estimated <br />Elevation of <br />Bottom of <br />Slurry Wall <br />(Key) <br />(feet) <br />(feet) <br />(feet) <br />(feet) <br />(feet) <br />(feet) <br />(feet) <br />65 +00 <br />4655.4 <br />65.0 <br />4590.4 <br />68.0 <br />4587.4 <br />72.0 <br />4583.4 <br />66 +00 <br />4655.4 <br />60.2 <br />4595.2 <br />64.1 <br />4591.3 <br />68.1 <br />4587.3 <br />67 +00 <br />4655.7 <br />56.2 <br />4599.5 <br />60.8 <br />4594.9 <br />64.8 <br />4590.9 <br />68 +00 <br />4656.0 <br />52.2 <br />4603.8 <br />57.5 <br />4598.5 <br />61.5 <br />4594.5 <br />69 +00 <br />4656.3 <br />49.0 <br />4607.3 <br />55.0 <br />4601.3 <br />59.0 <br />4597.3 <br />Boring LH -17 @ Approximate Station 69 +80 <br />70 +00 <br />4655.0 <br />48.6 <br />4606.4 <br />53.4 <br />4601.6 <br />57.4 <br />4597.6 <br />71 +00 <br />4655.0 <br />49.4 <br />4605.6 <br />53.0 <br />4602.0 <br />57.0 <br />4598.0 <br />71+81 <br />4655.9 <br />51.1 <br />4604.8 <br />54.0 <br />4601.9 <br />58.0 <br />4597.9 <br />TABLE III <br />SUMMARY OF ESTIMATED BEDROCK DEPTHS FOR CONSTRUCTION <br />SOIL BENTONITE CUTOFF WALL FOR <br />GEISERT GRAVEL PIT <br />SLURRY WALL DESIGN <br />GREELEY, COLORADO <br />Notes: <br />1. Key -in depth assumes 4 ft key into competent bedrock. <br />2. Depths are estimated based on interpolation between borings. <br />3. Actual depths to be determined based on conditions encountered during excavation. <br />* Note; Actual Depth is approximately 4 to 8 feet less due to proposed work pad cut <br />LYMAN HENN, A DIVISION OF BRIERLEY ASSOCIATES, LLC <br />G: \PROJECTS \111025 Geisert Gravel Pit Slurry Wall\O \O1 \Tables \[Table Ill Bedrock Depths for construction.xls]BR Depth <br />Page 3 of 3 <br />7/27/2011 <br />