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• -8- • <br />suitability of the on-site overburden soils for later use as backfill at the time of <br />stripping and stockpiling. <br />PERCOLATION TESTING <br />Percolation tests were conducted in the Phase 1 area to evaluate the feasibility of <br />an infiltration septic disposal system. One profile hole (Boring 13) and three <br />percolation holes were drilled at the approximate locations shown on Fig. I. The test <br />holes were drilled with 6 inch diameter auger and were soaked with water one day <br />prior to testing. The soils encountered in the percolation holes are similar to those <br />encountered in Boring 13, shown on Fig. 3, and consist of topsoil and about 3 feet of <br />silty sand overlying the dense gravel terrace deposit. The percolation test results are <br />presented in Table [I. Based on the subsurface conditions encountered and the <br />percolation test results, the tested area should be suitable for a conventional infiltration <br />septic disposal system. If the selected disposal azea changes location and depth, <br />additional percolation testing should be performed for septic disposal design. <br />LIMITATIONS <br />This study has been conducted in accordance with generally accepted <br />geotechnical engineering principles and practices in this area at this time. We make no <br />warranty either expressed or implied. The conclusions and recommendations submitted <br />in this report are based upon the data obtained from the geologic reconnaissance, <br />exploratory borings drilled at the locations indicated on Fig. 1, the proposed <br />development plan and our experience in the area. Our findings include interpolation <br />and extrapolation of the geologic profile information and the subsurface conditions <br />identified at the exploratory borings, and vaziations in the subsurface conditions may be <br />encountered during mining operations. If subsurface conditions appear different from <br />those described in this report, we should be notified so that re-evaluation of the <br />conclusions and recommendations may be made. <br />H-P GEOTECH <br />