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Opening of Quotes - Laurel Woods Drainage Improvements Proj No. 121-007 - Selge Construction Co., Inc.
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Opening of Quotes - Laurel Woods Drainage Improvements Proj No. 121-007 - Selge Construction Co., Inc.
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7/13/2021 4:32:41 PM
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Board of Public Works
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Projects
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7/13/2021
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<br />FIELD EXPLORATION PROCEDURES <br />Standard Penetration Test Soil Borings <br />General <br />We wish to point out that the soils actually recovered from our borings for observation and <br />testing represent a very small percentage of the site soils. Our records depict subsurface <br />conditions only at specific locations and at the particular time when drilling. Soil conditions at <br />other locations may differ from conditions occurring at these boring locations. The passage of <br />time may result in a change in the subsurface soil and groundwater conditions at the boring <br />locations. The interface between differing subsurface materials on the logs and profiles <br />represent approximate boundaries. The transition between materials may be gradual. Also, <br />thin strata that occur between sample depths may be present, but remain undetected by <br />routine sampling procedures. <br />Drilling Procedures <br />Soil borings were performed at the approximate locations shown on the attached boring plan. <br />The soil borings were advanced by mechanically twisting a continuous steel‐flight, hollow‐stem <br />auger into the soil. The inside diameter (I.D.) of the hollow‐stem auger is typically 3‐¼ in. <br />(sometimes a 6‐in. I.D. auger is used, particularly when installing 4‐in. diameter monitoring <br />wells). <br />The auger is turned into the ground, which displaces the soil upwards as it advances. Once the <br />desired sample depth is achieved, the advancement of the hollow‐stem auger is stopped. The <br />hollow‐stem is then cleaned of any soil and the sampling tools are inserted, and the sampling is <br />performed. When drilling below the water table in pervious soils, a head of water is maintained <br />in the hollow‐stem, to prevent a "quick" condition at the auger tip. <br />Penetration Testing and Split‐Barrel Sampling <br />Standard Penetration Testing and split‐barrel sampling are normally conducted in the borings to <br />provide relative density information and soil samples for visual classification and laboratory <br />testing. The standard split‐barrel (commonly called split‐spoon) sampler is a 2‐in. O.D., <br />1.375‐in. I.D., typically 18 to 24 in. long and is connected to an AW or N size drilling rod. The <br />sampler is then driven into the soil with a force of a 140 lb. hammer free‐falling a distance of 30 <br />in. The number of hammer blows required to drive the sampler into the soil is recorded for <br />each 6‐in. interval. The sampler is typically driven a total of 18 in., and the last two 6‐in.
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