02-27-2002 Council Agenda - Laserfiche WebLink

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FEB 14 '02 05:31PM BRAUN INTERTEC P.7/24 Drywall Supply, Inc. BBXX- 02 -010A January 29, 2002 Page 3 Geologic origins are presented on Log of Boring sheets. The geologic origins assigned were based CM the compositions of the materials encountered, the penetration resistances recorded in those materials, and available knowledge of the depositional history of the arca, 23.2. Soil and Material Data 13 -2.a. Existing Pavement. Bituminous pavements encountered at Borings ST -1 though ST -4 was about 3 to 4 inches thick. The bituminous appeared to be underlain with about 4 to 12 inches of aggregate base. Boring ST -S was performed in the southern portion of the site where the surface was covered by aggregate base. At this location, the aggregate base was about 12 inches thick. 1.1.2.b. Existing Fill. Below the existing pavement, the borings encountered existing MI extending to depths ranging in depth from about 6 to 11 feet. The existing fill consisted of a mixture of silty and clayey sand but also included poorly graded sand, lean clay and silt. The existing fill was identified by its mixed soil composition and coloration, and the presence of organic materials buried below it. The fill material ranged in color from brown to dark brown and black, and was generally moist. B.2.c. Organic Deposits. Below the existing fill, the, borings encountered organic deposits consisting of Muck (PT), organic eta)? (UL) and organic silt (OL). Muck is tens used to describe highly decomposed organic soils (peat). At the locations explored, the depths ranged from about 1 I 'to 23 feet below the surface. The organic deposits were black, dark gray to olive -gray and wet. B.2.d. Lacustrine Soils. Below the organic materials, the borings encountered lacustrine (lake - deposited) soils consisting of lean clay (CL), silt (ML) fine- grained silty sand (SM), and poorly graded sand with silt (SP -SM). The lacustrine soils were gray, waterbearing, and were often interbedded with seams and layers of sand, silt and clay.