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Harding Lawson AsaoalMes <br /> 0e tailed descriptions of the materials encountered in W-5, P-1 and P-2 <br /> are presented on Plates 2 and 3. This log includes the blow counts of the <br /> 5&1 samplers, converted to Standard Penetration blow counts (N-values ?. <br /> 4 f ' <br /> The samples were logged by our field engineer in accordant-° with the Unified <br /> 14` <br /> Soil Classification System shown on Plate 4. Samples were then delivered <br /> under chain of custody to Analytical Science Associates (ASA) in Emeryville, <br /> California, for chemical testing. <br /> 77 Upon completion of drilling and sampling, we installed 2-inch-diameter <br /> i Schedule 40 PLIC.well casing to 18 feet; the screened interval is between I <br /> 3 and 17.5 feet below ground surface. A well completion log for MW-5 <br /> (Plata 5) shows construction details. The top of !+!W-5 was placed slightly <br /> above the ground metal well <br /> surface and secured with a locking <br /> cover. The <br /> WL-11 was also equipped with a watertight cap to minimize intrusion of sur- ; <br /> face water. MW-5 was installed in accordance with the construction Stan- <br /> dards outlined in our letter of November 20, 1986, ,Application for Well i <br /> Permits," which was submitted to the SJLFD. These standards comply with <br /> i <br /> those set by the California Regional Water Quality Control Board. <br /> After the installation of hal-5, we drilled Probe P-1 to a depth of <br /> 5 feet and collected a sail sample using the same drilling operation and <br /> { <br /> *Standard penetration.N-values are.defined as the.nunber of blows of a <br /> 1q1-pound hammer falling 30 inches required to advance a standard sampler (2 <br /> ;-� i^.^��:- 0.D. and and 1.5 inches I.D.) the final 12 inches of an 18 inch, <br /> driver The standard hammer driving mechanism utilizes a cathead-drum and a <br /> rope and pulley system. <br /> 3 <br /> f ai <br /> F '.'x <br />