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Laboratory moisture content within the underlying clayey subgrade soils ranged from about 181/2 <br />to 53 percent. These values indicate that the clayey soils were likely above their assumed optimum <br />moisture content based on the standard Proctor test. Clayey soils that will be excavated and reused <br />as fill or backfill will likely require some moisture conditioning to meet the recommended <br />compaction levels. <br />fable 3. Summary of Laboratory Analysis <br />Boring <br />Number <br />Sample <br />Depth <br />(feet) <br />Moisture <br />Content <br />(%) * <br />P-200 <br />N* <br />Organic <br />Content <br />(o/a) x <br />Vanadium Street between Green Valley Road and 1801h Lane <br />SB-1 <br />SS-68 <br />10 <br />181/2 <br />- <br />21/2 <br />SB-2 <br />SS-4 <br />71/2 <br />36 <br />- <br />61/2 <br />SB-2 <br />SS-6 <br />121/2 <br />53 <br />- <br />- <br />SB-3 <br />SS-9 <br />21/2 <br />281/2 <br />- <br />- <br />SB-5 <br />SS-60 <br />21/2 <br />28 <br />- <br />- <br />1781h Lane NW from about 300 feet west of Vanadium Street to Uranium Street <br />SB-4 SS-15 1 5 1 34 -1 - <br />Uranium Street from about 150 feet north of 1801h Lane NW to 1781h Lane NW <br />S13-8 <br />SS-57 <br />71/2 <br />53 <br />- <br />- <br />SB-9 <br />SS-39 <br />21/2 <br />271/2 <br />- <br />- <br />SB-10 <br />SS-34 <br />21/2 <br />32 <br />- <br />- <br />SB-12 <br />SS-24 <br />21/2 <br />24 <br />- <br />- <br />179th Lane NW <br />from Uranium Street to about 300 feet east <br />SB-11 <br />SS-29 <br />1 21/2 <br />311/2 <br />- <br />- <br />*Moisture contents and P-200 contents were rounded to the nearest 1/2 percent <br />3.4 OSHA Soil Classification <br />The soil encountered in the borings consisted of a variety of both sandy and clayey soil types. The <br />sandy soils included; poorly graded sand, poorly graded sand with silt, silty sand, clayey sand <br />and silty clayey sand corresponding to the ASTM classifications SP, SP-SM, SM, SC and SC-SM, <br />respectively, and will be Type C soils under Department of Labor Occupational Safety and Health <br />Administration (OSHA) guidelines. The clayey soils included; lean to fat clay, lean clay, sandy <br />lean clay, lean clay and silty clay correspond to the ASTM Classifications CL-CH and CL. These <br />soils will generally be Type B soils under Department of Labor Occupational Safety and Health <br />Administration (OSHA) guidelines. <br />An OSHA -approved qualified person should review the soil classification in the field. Excavations <br />must comply with the requirements of OSHA 29 CFR, Part 1926, Subpart P, "Excavations and <br />Trenches." This document states excavation safety is the responsibility of the contractor. The <br />project specifications should reference these OSHA requirements. <br />7 <br />