2008-03-25_PERMIT FILE - M2008017 (2)

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2) Lower Soils: Below the upper soils, varying types of weathered and competent bedrock consisting of siltstone and claystone were present to the depths explored. Competent bedrock was present at depths ranging from forty-five feet (45') to greater than one hundred twenty feet (120') below existing surface. -- 3) Groundwater: Groundwater was encountered at depths ranging from eight feet (8') to forty feet (40'). Water levels in this area are subject to change due to seasonal variations and irrigation demands on and/or -- adjacent to the property. Table No. 2 summarizes the depth and elevation of the groundwater and competent bedrock. TAQI C t~lfl 7 _ CI IMMARV nG R(1QF nnTA RT BORE # EXISTING GROUND ELEVATION FT) DEPTH TO GROUND WATER (FT) ELEVATION TO GROUND WATER (FT DEPTH TO COMPETENT BEDROCK FT ELEV. TO COMPETENT BEDROCK FT) 1 4633.33 8.0 4625.3 45.5 4587.8 2 4631.63 9.0 4622.6 85.0 4546.6 3 4629.83 9.0 4620.8 86.0 4543.8 4 4630.52 11.0 4619.5 83.0 4547.5 5 4630.53 9.0 4621.5 82.0 4548.5 6 4634.50 15.0 4619.5 89.0 4545.5 7 4638.15 17.0 4621.1 77.0 4561.1 8 4637.61 13.0 4624.6 76.0 4561.6 9 4636.29 15.0 4621.3 89.0 4547.3 10 4632.63 8.5 4624.1 84.5 4548.1 11 4630.68 11.0 4619.7 86.0 4544.7 12 4632.48 17.0 4615.5 74.0 4558.5 13 4630.70 9.0 4621.7 85.0 4545.7 14 4658.46 40.0 4618.5 >120 >4538.5 15 4661.19 35.0 4626.2 115.0 4546.2 -~- RECOMMENDATIONS AND DISCUSSION Based upon the results of our investigation, we conclude that from a geotechnical standpoint, the site is suitable for the proposed construction with the following limitations listed below: --~ The slurry wall is proposed to be hammer driven with slurry injection. The slurry wall should be installed a minimum of five feet (5') into competent bedrock or until refusal occurs. Some leakage may still occur through the siltstone bedrock stratum. A Geotechnical Engineer's representative should be on site to verify competent bedrock is encountered.