Agenda - Council - 12/14/2021 - Laserfiche WebLink

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3.3 Laboratory Testing Laboratory moisture content and precent passing the #200 sieve (P-200) content tests were performed on selected samples recovered from the soil borings. Table 3 below summarizes the results of the laboratory tests. Results of the laboratory tests are also shown on the boring log adjacent to the sample tested. Table 3. Summary of Laboratory Tests BoringNub Sample Depth Moisture Content P-200 Content Number Number (feet) N * N SB-1 SS-11 5 31/2 3 SB-2 SS-3 5 51/2 41/2 SB-4 SS-27 5 51/2 4 SB-5 SS-43 5 7 21/2 SB-6 SS-35 5 81/2 61/2 SB-8 SS-59 5 7 51/2 SB-9 SS-66 21/2 2 51/2 SB-9 SS-67 5 17 4 SB-10 SS-75 5 45 - SB-10 SS-76 71/2 48 - SB-12 SS-91 5 4 4 SB-12 SS-94 121/2 41 - SB-12 SS-95 15 251/2 - SB-12 SS-96 20 65 - *Moisture content values rounded to the nearest 1/2 percent. 3.4 OSHA Soil Classification The soils encountered in the borings consisted of predominantly of sandy soils composed of poorly graded sand, poorly graded sand with silt and silty sand corresponding to the ASTM classifications of SP, SP-SM and SM. These soils will generally be Type C soils under Department of Labor Occupational Safety and Health Administration(OSHA) guidelines. The borings also encountered clayey sand and silty clay that mostly had a soft consistency. For that reason, the clayey sand and silty clay will also generally be Type C soils under OASHA guidelines. An OSHA-approved qualified person should review the soil classification in the field. Excavations must comply with the requirements of OSHA 29 CFR, Part 1926, Subpart P, "Excavations and Trenches." This document states excavation safety is the responsibility of the contractor. The project specifications should reference these OSHA requirements. 5