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S. <br />on the boring logs. In addition, several 3-inch undisturbed • <br />Shelby tube samples were taken of representative fine- <br />grained soils where appropriate. These samples were pushed <br />~ into the soil to minimize sample disturbance. <br />A limited laboratory testing program was performed on <br />representative soil samples to verify the visual soil classi- <br />fication and aid in evaluation of soil properties. The tests <br />consisted of eleven mechanical grain-size analyses, natural <br />moisture contents, seven Atterberg limit determinations, and <br />several pocket penetrometer strength tests. The results of <br />the grain-size analyses are presented in the Appendix, while <br />the Atterberg limit, moisture content and pocket penetrometer <br />data are shown on the boring logs. Due to the heterogenous <br />nature of the soil deposits, their primarily granular nature, <br />and the intent of this study, triaxial strength tests were not <br />performed. Rather the strength parameters were estimated <br />from boring sample penetration resistance, soil composition, • <br />I. <br />and pocket penetration data. <br />3.0 SITE CONDITIONS <br />3.1 Surface Conditions <br />The details of the area surface conditions are <br />amply discussed in previous reports and is only discussed here <br />L as related to Streeter Canyon. As shown on Figure 1, Streeter <br />Canyon is an east-west V-shaped valley with valley walls ris- <br />1 ing some 400 to 500 feet at a slope of about 1.5:1 Co 3:1. <br />The valley floor widens to the west from less than 100 feet <br />to over 500 feet at its mouth while dropping aC a grade of <br />about 20:1. Several secondary north-south canyons drain into <br />Streeter as shown on Figure 1. Aluch of the topography within <br />the valley has been altered by recent grading for haul roads <br />and placement of waste dump material. ~ • <br />I_ <br />[~: <br />f'_ <br />