Laserfiche WebLink
<br />4 <br /> <br />The P-200 content is a measure of the silt and clay sized particle of a sample. The P-200 <br />contents within the aggregate base or Possible Aggregate Base ranged from about 4 ½ to 26 ½ <br />percent. New MN/DOT Class 5 aggregate base has a P-200 content ranging from 3 to 10 <br />percent. The P-200 content of the Possible Aggregate base at boring SB-3 was significantly <br />greater than MN/DOT requirements and therefore does not meet MNDOT requirements. The <br />aggregate base at SB-1 had a P-200 content within the range for MN/DOT aggregate base. <br />Laboratory test results are summarized in Table 1 and are also shown on the boring logs <br />adjacent to the sample tested. <br /> <br />Table 1. Summary of Laboratory Tests <br />Boring Number Sample <br />Number <br />Depth <br />(feet) <br />Moisture <br />Content (%) * <br />P-200 Content <br />(%) * <br />SB-1 AU-1 Aggregate Base 16 4 ½ <br />SB-1 SS-2 2 ½ 26 ½ - <br />SB-2 SS-8 5 22 ½ 56 ½ <br />SB-3 AU-11 Aggregate Base 19 ½ 26 ½ <br />SB-3 SS-13 5 20 - <br />*Moisture content and P-200 contents were rounded to the nearest ½ percent. <br /> <br />3.4 OSHA Soil Classification <br /> <br />Below the topsoil or aggregate base, the soils encountered in the borings consisted of sandy <br />lean clay meeting the ASTM Classification of CL. These soils will generally be Type B soils <br />under Department of Labor Occupational Safety and Health Administration (OSHA) <br />guidelines. <br /> <br />An OSHA-approved qualified person should review the soil classification in the field. <br />Excavations must comply with the requirements of OSHA 29 CFR, Part 1926, Subpart P, <br />“Excavations and Trenches.” This document states excavation safety is the responsibility of <br />the contractor. The project specifications should reference these OSHA requirements. <br /> <br /> <br />4.0 DISCUSSION AND RECOMMENDATIONS <br /> <br />4.1 Proposed Construction <br /> <br />We understand the project will include reconstructing the existing gravel driveway as a <br />bituminous paved roadway and will also include constructing a stormwater management <br />pond. We assume that new underground utilities could also be installed as part of roadway <br />construction. <br /> <br />We were not provided any information regarding roadway grades and for the purposes of <br />this evaluation we do not anticipate any significant changes in the roadway alignment or <br />roadway grades however we assume the driveway will be widened to meet city standards. <br />Permanent grade changes, if any, are anticipated to be less than 3 feet. Underground utilities, <br />if any are anticipated to bear at depths ranging from about 5 to 10 feet below the ground <br />surface. <br /> <br />210