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-5- <br />1 <br />In the 'two monitoring wells and in both shallow boreholes field permea- <br />bility tests, using the falling head method, were performed. The results of two <br />tests perjformed in the shallow borings (lA and 16) indicated very low <br />permeability of the top strata, on the order of 1.0 to 1.2 x 10-6 cm/sec. These <br />values, which are typical of permeability of a silty clay, should be very <br />representative of the permeability of the soils which immediately underlie the <br />waste rock pile. <br />Two tlests performed at the top of bedrock in the monitoring wells (Borings <br />_ 2 and 3) 'indicated slightly higher permeability on the order of 2.1 to 3.9 x <br />10-6 cm/sec. Permeability test results and calculations are included in the <br />] ppendix. <br />Laboratory permeability tests were also performed on "undisturbed" samples <br />of colluvial soils. The results of these tests, as presented in the Appendix, <br />1 indicate permeabilities in the range of 9 x 10-B to 5 x 10-/ cm/sec. -These <br />1 values are very consistent with the permeabilities measured in field <br />,permeability tests. <br />Results of the hydrologic investigation indicate that the subsurface soils <br />composed principally of impermeable clays, and that there are no water <br />ring strata in the colluvial soils. <br />ceoNwrto consutnrw, wc. <br />