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1 4logicalTech�ucslnc Page 7 Site Conceptual Model Report(2006 Revision) valentine(Castle Motors) Projt,ct No 723 2 June 16,2006 ' and the driller had difficulty in differentiating between drilling through sand versus clay/silts based on resistance through the 128 — 155 feet bgs interval Based on an ' examination of the recirculating drill mud, it is suspected that the interval contained alternating sand and slit/clay intervals as present in shallower depths « MW-7 (continuous coring) the subsurface contained alternating layers of sands, silts and ' clays Sand intervals occur at 0 — 20, 36 — 50, 63 — 78 and 87 — 91 feet bgs The sands ranged from very fine to very coarse grain size and brown, grey, and olive-grey in color CaCO3 inclusions, iron oxide staining and brown/black organic detritus were ' occasionally present Some sand layers contained pebbles up to 20 mm in length Fine grain units- silts and clays were found at depths of approximately 20 — 35, 50 — 63, 78 — 87 and at the boring terminus at 91 —95 feet bgs The silts and clays ranged from brown, ' red-brown to olive-grey in color with prominent CaCO3 inclusions at depths of 52 - 57 & 79 — 80 feet bgs • MW-8 the subsurface contained alternating layers of sands, silts and clays This boring was sampled at 5 foot intervals and exhibited less detail than MW-7 Sand intervals occur at 0 — 25, 35, 50, 70 - 85 feet bgs The sands ranged from very fine to very coarse gram size and brown, grey, and olive-grey in color CaCO3 inclusions, iron oxide staining and black organic detritus were occasionally present CaCO3 inclusions were prominent in the sands at 10 feet bgs Fine grain units- silts and clays were found at depths of approximately 30, 40 — 45, 55 - 65 and at the boring terminus at 90 --- 95 feet bgs The silts and clays ranged from brown to olive-grey in color with prominent CaCO3 inclusions at depths of 45 & 55 feet bgs ' • MW-9 as with the MW-7 and MW-8 locations the subsurface contained alternating layers of sands, silts and clays Sand intervals occur at 15, 25, 45, 60 — 85, and at the boring terminus at 95 feet bgs The sands ranged from very fine to very coarse grain size ' and brown, grey, and olive-grey in color CaCO3 inclusions, iron oxide staining and black organic detritus were occasionally present CaCO3 inclusions were prominent in the clayey sands at 15 feet bgs with a cemented t/2" caliche layer Fine grain units- silts and clays were found at depths of approximately 0— 10, 20, 30 —40, 50— 55, and 90 feet bgs The silts and clays ranged from brown to olive-grey in color with prominent CaCO3 inclusions at depths of 40 and 90 feet bgs ' • CPT-1 The CPT log shows heterogeneous soils extending to the total depth of 74 5 feet bgs The log shows shallow silty or clayey soils to 5 feet bgs These are underlain by alternating silty, clayey or undifferentiated,_stiff fine grained units (hereafter referred to as fine grained units extending to 24 feet bgs A thin, 0 5 foot thick sand to silty sand unit ' is present at 24 feet bgs that is underlain by more fine grained units Silty, clayey and fine grained units are present from 24 — 32 feet bgs A 3 foot thick silty sand to sandy silt unit ' is present at 32 feet bgs that is underlain by sandy silt, sand and gravelly sand units extending from 35 — 45 feet bgs The ten foot thick sandy units are underlain by silty, clayey and fine grained layers from 45 — 68 feet bgs These fine grained units are ' followed by four feet of sand to clayey sand units The remainder of the borehole consisted of silty sand to sand units from 72 to 74 5 feet • • CPT-2 The CPT log shows primarily fine grained units extending to the total depth of 68 ' feet bgs The log shows fine grained units to 25 feet bgs, with a one foot thick silt layer at