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' ow4'8 ecaI rah4ks Ha Page 7 Site Conceptual Model Report Project No 724 2 May 2,2006 ' ❑ The sands ranged from very fine to medium in grain size and brown to grey or black in color CaCO3 nodules and black organic detritus or magnetite were occasionally present ' ❑ Fine grain units- silts and clays were found at depths of approximately 0 — 5, 30—40, 55 — 65 and 70—75 feet bgs ❑ The silts and clays ranged from brown, grey, and green to blue-grey in color with ' some CaCO3 nodules and black organic detritus or magnetite Wells MW-109/209 ' Intermediate and deep well pair MW-109/209 was installed approximately 75 feet east of the site This is a down gradient position and the subsurface in this location is characterized as follows ❑ The subsurface contained alternating layers of sands, silts and clays ❑ Sand intervals occur at 0 — 10, 20 - 25, 50, 60 and 70 feet bgs ❑ The sands ranged from very fine to coarse in grain size and light brown to blue-grey or grey in color CaCO3 nodules and black organic detntus or magnetite were occasionally present ❑ Fine grain units- silts and clays were found at depths of approximately 15, 25 - 45, 55, ' 60—65 and 75 feet bgs ❑ The silts and clays ranged from light brown, light grey to blue/green-grey in color with some CaCO3 nodules and black organic detritus or magnetite At 35 feet bgs a M prominent t/a" thick white clay layer was present between grey clays above and brown silty clays below ' Wells MW-1101210 Intermediate and deep well pair MW-110/210 was installed approximately 40 feet southeast of the site This is a down gradient position and the subsurface in this location ' is characterized as follows ❑ The subsurface contained alternating layers of sands, silts and clays ❑ Shallow samples contained both live roots and root tubes ' ❑ Sand intervals occur at 0—5, 20, 35, 45, 70—75 feet bgs ❑ The sands ranged from very fine to coarse in grain size and brown to grey in color CaCO3 nodules, iron oxide staining and black organic detritus or magnetite were ' occasionally present ❑ Fine grain units- silts and clays were found at depths of approximately 10 - 15, 25 - 35, 40, 50—70 feet bgs ' ❑ The silts and clays ranged from light brown, light grey to blue/green-grey or grey in color with some CaCO3 nodules and black organic detritus or magnetite CPT testing completed in January 2006 • CPT-1 The CPT log shows predominantly fine grained units extending to the total rdepth of 55 6 feet bgs The log shows shallow clays or silty clays to 9 feet bgs, then silty sand to sandy silt layers to 12 feet bgs This is underlain by alternating silt cli!yey or undifferentiated stiff fine gLained units (hereafter referred to as fine grained