02-27-2002 Council Agenda - Laserfiche WebLink

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Mr. Sam Roberto Project BBXX- 01 -119A May 24, 2001 Page 2 B. Results B.1. Log of Boring Sheets Logs of our borings follow Figure 1 in the Appendix. The logs classify and describe the materials encountered by the borings, and present the results of penetration resistance tests and groundwater measurements. Geologic origins assigned to the strata shown on the logs were determined from a review of material classifications, penetration resistance tests and geologic publications pertinent to the site and general area. B.2. Materials Summary The borings encountered approximately 6 feet of existing fill below the surface. The existing fill consisted of silty sand, which was dark brown or grayish brown, and was moist. The existing fill was initially underlain with swamp- deposited peat, which was dark brown to black, was moist, fibrous, and extended to a depth of approximately 10 feet. The existing fill and peat were underlain with alluvial soils consisting of poorly graded sand with silt, and with glacial soils consisting of sandy lean clay. The alluvial soils were gray and waterbearing; the glacial soils were brown and gray, were wet, and contained trace amounts of gravel. B.3. Penetration Resistance Data Penetration resistance values recorded in the existing fill ranged from 4 to 9 BPF, indicating that it was variably, and locally rather poorly, compacted. Penetration resistances in the swamp - deposited peat ranged from 5 to 10 BPF, indicating it was loose. Penetration resistances of 2 and 3 BPF were recorded in the alluvial soils, indicating they were very loose, and penetration resistances of 7 to 11 were recorded in the glacial soils, indicating they were of medium to rather stiff consistency.