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Section 3 <br /> �] Results <br /> I : <br /> This section presents the results of the remedial investigation at the former Disco <br /> underground tank location including a summary of the local geology, hydrogeology, soil <br /> investigation results, groundwater investigation results, applicable regulations and <br /> guidelines, and groundwater use in the area. <br /> Local Geology <br /> Subsurface materials encountered at Plant 33 consist of alluvial soil deposits. The soil <br /> types. include sands, silty sands, fine sandy silts, and silty clays. Soil boring logs <br /> developed during the field investigation are contained in Appendix D. <br /> A generalized interpretation of the shallow stratigraphy is shown on Figure 3-1. The <br /> upper 90 feet,of soil beneath the former Disco tank location and surrounding Plant 33 <br /> ' property consist predominantly of cohesive fine silty. sands and sandy silts. No soil <br /> stratification or clay layers were observed, and the upper 90 feet of soil appear <br /> relatively homogeneous. <br /> Sieve and hydrometer analyses were conducted on selected soil samples, typical of the <br /> soil encountered throughout the upper 90 feet; the results of these analyses are <br /> presented in Table 3-1 and on Figure 3-2. The sieve and hydrometer analyses indicate <br /> the soil encountered in the upper 90 feet is composed of about 50 percent to 70 <br /> percent silt and clay and 30 percent to 50 percent fine sand. Blow counts recorded <br /> during drilling of the shallow borings (depth of 90 feet bgs or less) indicate that the soil <br /> consistency ranges from firm to very stiff but is predominantly stiff. <br /> I , <br /> I ' <br /> I <br /> 1 <br /> r.. <br /> { <br /> 8FO31604\RP1006.51 3-1 <br />