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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 />interval blow counts are added together and commonly referred to as the "N" value, blow <br />count or penetration resistance. Representative samples are placed in airtight glass jars and <br />returned to our laboratory for further observation and testing. Descriptions of the spilt‐barrel <br />samples and the penetration resistances are shown on the boring logs. <br />Shelby Tube Sampling Procedure <br />In the Shelby tube sampling procedure, a thin‐walled steel seamless tube with a sharp cutting <br />edge is pushed hydraulically into the soil and a relatively undisturbed sample is obtained. This <br />procedure is generally employed in cohesive soils. The tubes are carefully handled in the field <br />to avoid excessive disturbance and are returned to the laboratory for extrusion and further <br />analysis and testing. <br />Calibrated Pocket Penetrometer Testing <br />The strength of cohesive soils does not correlate as well as granular materials with the Standard <br />Penetration Testing described above. Typically, we test split‐barrel samples of cohesive soils <br />with a calibrated pocket penetrometer in the field. This test involves pushing a spring‐loaded <br />piston, 0.25‐in. in diameter, into the sample and measuring the spring deflection, which has <br />been correlated to shear strength. This test is used as a rough approximation method only. <br />More refined results require undisturbed Shelby tube sampling and laboratory unconfined <br />compressive strength testing. <br />Water Level Readings <br />When the drilling crew notices groundwater or significant variations in soil moisture, they are <br />recorded on the boring logs. Generally, the level of water at the time of drilling is measured <br />and recorded. The readings may indicate the approximate level of the hydrostatic water table <br />at the time of our drilling activities. <br />Where low permeability soils are encountered, the water seeps into the borings at a slow rate, <br />and it is generally not possible to establish accurate groundwater level readings in an open <br />borehole during the drilling operations. If water‐drilling methods are used, a local groundwater <br />"mound" could be created, taking several days to dissipate. Also, the groundwater level <br />typically fluctuates on a long‐term or seasonal basis, due to variations in precipitation, surface <br />run‐off, evaporation, etc. When these long‐term readings are required, piezometers or <br />monitoring wells are necessary to maintain an open hole.
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