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� r <br /> Project No 58080-06-OIC <br /> August 31, 1994 <br />' It should be recognized that the headspace surveys do not represent quantitative analyses, but <br /> are intended to qualitatively assess the potential for the presence of organic vapors in the pore <br />' space of the soil samples surveyed <br /> Soil and Geologic Conditions <br /> ' The soil conditions encountered in the exploratory borings generally consisted of fill soils <br /> overlying alluvial deposits of the Quaternary-aged Modesto Formation Descriptions of the <br /> ' soil and geologic units encountered are presented hereinafter An interpretive geologic cross <br /> ' section is presented as Figure 5 <br /> Fill soils were encountered to depths of between 7 and 10 5 feet bgs in borings GB-1, GB-3, <br /> ' GB-4 and GB-5 The fill soils are generally comprised of silty,fine to coarse grained sand and <br /> are similar in nature to the near surface alluvial deposits as encountered in boring GB-2 <br /> The alluvial deposits encountered underlying the fill soils generally consist of interbedded <br /> sand, silt and clay More specifically, an orangish brown silty fine- to medium-grained sand <br /> was encountered underlying the fill soils to depths on the order of 15 to 17 feet bgs <br /> Interbedded olive brown to greenish gray clayey sands and sandy clay, clay and silt was <br /> encountered underlying the orangish-brown silty sand layer These interbedded soil layers <br /> ' extend to depths on the order of 29 to 38 feet bgs A white to gray, fine- to medium-grained <br /> - 27 - <br />