02-27-2002 Council Agenda - Laserfiche WebLink

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FEB 14 '02 05 :31PM BRAUN INTERTEC P.8 /24 Drywall Supply, Inc. 1313)0C-02-010A January 29, 2002 Page 4 13.3. Penetration Resistances During drilling, penetration resistance rests were perforated in the borings and the results are shown on the corresponding Log of Boring sheets in the column marked "Bl'F" (blows per foot). Table 1, below, provides the range of penetration resistances for each soil deposit and our interpretive cootntents. Table 1. Penetration Resistance Data Soil Origin Primary Soil Txpss Range of Penetration Resistances Comments Existing Fill Silty and clayey sand, and poorly graded sand 4 u more than 50 BPF poorly compacted Organic Deposits Pea and Muck 3 to 6 BPF highly compressible Soft Organic Deposits Organic Clay and Silt 2 to 3 BPF iacustrine Lean clay 2 to 4 BPF Soft to rather soft. .Lactlstrine Silt, silty sand and poorly graded sand with silt. 4 to 9 BPF Very loose to loose Note that several bonngs exhibited some rather high penetration resistance values in the existing fill in the upper 2 feet. These values appear to be due to, in the case of Boring ST-4, gravel and cobbles in the existing fill or could be attributed to partially frozen soils. B.4. Groundwater Data During drilling and after withdrawal of the auger, water was observed in the borings at depths ranging from about 9 to 18 feet. Where the borings remained open for several hours, water was recorded in Borings ST -2 and ST -3 at depths of 11 and 12 feet, respectively. Because the soils on this sire are rather impermeable and release water slowly, some time would be l;equircd for the water levels to stabilize in the boreholes. Based on our review of the preliminary soil and groundwater data, we recommend that preliminary plans assume the groundwater to be at about 9 or 10 feet below exiting site grades.