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Section No. 6 <br /> • Revision No 1 <br /> Date January 13, 1992 <br /> Page 53 of 55 <br /> Correlations between blows per foot penetration (n-value) and the <br /> consistency and unconfined compressive strength in clays, and the compactness <br /> in sands will be made with caution using the appropriate reference curves. <br /> Depth, rod diameter, material penetrated, and proximity to groundwater will <br /> also be recorded in the field record and considered in the data analysis <br /> 6 10 2 Cone Penetrometer Testing <br /> Cone penetrometer exploration will be used to characterize the <br /> stratigraphy of a site, especially in geologic environments devoid of hard <br /> obstacles such as boulders, stone fragments or gravel beds <br /> Cone penetrometer exploration consists of the advancement of a probe <br /> into the ground while measurements of the probe tip resistance and sleeve <br /> resistance are recorded The ratio of the two forces provides valuable <br /> insight into the properties of the materials being penetrated <br /> Cone penetrometer tests will be performed in general conformance with <br /> ASTM Standard D 3441-75T Cone penetrometer tests will be performed in the <br /> general vicinity of boreholes which have been carefully logged by a <br /> geologist The interpretation of the CPT data will be calibrated to site <br /> specific conditions <br /> Cone penetrometer tips may be equipped with instrumentation which <br /> measures the specific conductance of the water surrounding the tip When <br /> equipped with this instrumentation, cone penetrometers can be used to <br /> additionally assess the groundwater quality impact of waste management units <br /> which store or handle inorganic liquids of high ionic strength <br /> • <br /> 6-53 <br />