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TECHNICAL MEMORANDUM <br /> Page 4 - <br /> June 3, 1992 <br /> ® SAC31583.AC2Z - <br /> made. The conclusions and recommendations contained in this technical memorandum were <br /> based on the applicable standards of the consulting profession at the time this memorandum <br /> was prepared. <br /> CH2M HILL is responsible for the conclusions, opinions, and results of.engineering analyses <br /> contained in this report as they pertain to the specific project and locations discussed herein. <br /> If conclusions or recommendations based on these data are made by others, such conclusions <br /> or recommendations are not the responsibility of CH2M HILL. <br /> Exploration and Testing <br /> "k Field Exploration <br /> The field exploration consisted of four soil borings drilled between April 29, 1992, and May <br /> 1, 1992- Figure 1 shows the approximate location of these four borings, designated as BH-1 <br /> through BH-4. Pitcher Drilling Company of Palo Alto, California, was subcontracted to drill <br /> the soil borings. CH2M HILL personnel specified the locations, depths of borings, and <br /> ® sampling intervals, and observed the drilling and sampling operations. <br /> The borings were 4-7/8-incl -°diameter and extended to depths ranging from 42.5 to 101.5 <br /> feet. The borings were advanced using mud rotary drilling methods with a truck-mounted <br /> Failing 750 drill rig. As each boring was completed, the hole was grouted to the surface <br /> using a neat cement grout. The borings were grouted from the bottom upward using a 2- <br /> inch drill pipe as a tremie. <br /> Relatively undisturbed samples were obtained using a 3-inch outside diameter Shelby tube <br /> sampler (ST samples) or Pitcher Barrel sampler (PB samples). The Pitcher Barrel sampler <br /> was used to obtain samples of very stiff clay where the Shelby tubes could not be pushed. <br /> This sampling was performed in general accordance with procedures for Thin-Walled Tube <br /> Sampling of Soils as described by the American.Society of Testing and Materials (ASTM), <br /> Standard D1587. Disturbed soil samples were obtained from the borings using a 2-inch <br /> outside diameter split-spoon sampler, driven as described for the Standard Penetration Test <br /> (SPT), ASTM Standard D1586. <br /> Soil recovered during the drilling program were visually classified by a CH2M HILL <br /> engineer in general accordance with ASTM D2487 and D2488. The soil names on the <br />