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Qealogkal Tech&a kc Page 6 Site Conceptual Model Report(2006 Revision) Valentine(Castle Motors) Project No 723 2 June 16,2006 ' • SB-2 Boring SB-2 soils were logged as ranging from clays to sandy loams The soils were dry to the total depth of 36 feet, and varied from grey to brown or mottled in color ' Sand cobbles to t/2" were noted at 20 feet that were suspected as fill material • SB-3 & SB-4 WJH logged borings SB-3 & SB-4 as containing soils similar to SB-1 & ' SB-2 above • MW-1 (SB-5) In boring MW-1 (SB-5), WJM described the soils as interbedded silts, clays and sands Soil colors ranged from brown to tan, with grey and molted soils also present The 20 foot sandy clay loam was described as ranging from grey to black in ' color Sandy/gravelly units were noted at 25 — 30 feet bgs, and soils below this level were predominantly clayey • MW-2 WJH logged boring MW-2 as predominantly clayey with sand layers noted at 15 ' and possibly 53 feet bgs The soil ranged in color from brown, reddish brown to grey hues The clays were described as friable or crumbly in strength and slightly plastic in ' toughness • MW-3 WJH logged boring MW-3 as similar to MW-2 but with more clayey sand units noted at 40 and 50 feet bgs • MW-4 WJH logged boring MW4 as predominantly clayey with sand layers noted at 25 feet bgs The soils ranged in color from brown to grey hues and iron staining was noted in the 25 foot sample • MW-5 WJH logged boring MW-5 as predominantly clayey with sand layers noted at 15 — 20 feet bgs The soil ranged in color from brown to grey hues with white inclusions noted at 45 feet The clays were described as plastic in this boring ' • MW-6 WJH logged boring MW-6 as sandy at 25 feet bgs The soils below this depth were predominantly clayey ranged in color from black,brown or grey hues • SB-B In boring SB-B, WJH described the soils as predominantly clayey with a coarse ' sand layer noted at 20 feet bgs Soil colors ranged as above with white inclusions noted at 35 feet and below They also ranged from dry to moist with clays ranging from moist and firm to plastic GTI logged the remainder of the borings- ' • SB-101/MW-101 The borehole exhibits a primarily clayey geology The clay is typically tan to brown and shows the presence of small amounts of fine-grained sand The clay ranges from plastic and soft to hard depending on moisture content A sand and gravel ' layer is present at approximately 20 feet bgs A heaving, fine to medium grained sand was encountered just below 70 feet and extending to 77 feet Another sand interval was noted at 97 — 99 feet bgs Samples from 100 to 111 feet were characterized as clays • MW-201 The borehole was free drilled to 110 feet due to its proximity to SB-101/MW- 101 The lithologic units documented between 108 — 117 feet bgs were typically brown silts and clays The clays ranged from plastic and soft to hard depending on moisture content 1t is suspected that sands are present in the 117 — 127 feet bgs interval based on the sand-mud plug found on the sampler tip during sampling attempts in this interval The remainder of the borehole was free drilled from 128 feet bgs to 155 feet bgs (27 feet) 1