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The strata changes were inferred from the changes in the samples and auger cuttings. The depths <br />shown as changes between strata are only approximate. The changes are likely transitions, <br />variations can occur beyond the location of the borings. <br />The bituminous cores were obtained on September 22, 2021 with a 4-inch diameter diamind core <br />barrel using wet coring techniques. <br />3.0 RESULTS <br />3.1 Soil Conditions <br />The subsurface soils encountered at this site generally consist of three main stratigraphic units: (1) <br />pavements (2) fill and buried topsoil (3) native alluvial deposits. <br />Each of the 31 soil borings and cores were taken within an existing bituminous surfaced roadway. <br />The pavement sections consisted of varying thicknesses of bituminous and possible aggregate <br />base. The observed pavement section thicknesses are summarized in Table 1 below. <br />Table 1. Summary of Existing Roadway Section <br />Boring <br />Number <br />Station <br />Approximate <br />Bituminous <br />Thickness <br />(inches)t <br />Approximate <br />Aggregate Base <br />Thickness <br />(inches)t <br />Subgrade Soil <br />Type <br />167th Lane NW <br />SB-01 <br />4+00 <br />5 <br />5 <br />SM <br />SB-02 <br />7+50 <br />31/2 <br />3 <br />SP-SM <br />SB-03 <br />10+00 <br />3 <br />3 <br />SP <br />SB-04 <br />12+50 <br />31/4 <br />3 <br />SP <br />SB-05 <br />15+40 <br />4 <br />31/2 <br />SP <br />SB-06 <br />19+00 <br />41/2 <br />3 <br />SP-SM <br />SB-07 <br />21+50 <br />4 <br />4 <br />SP <br />SB-08 <br />24+00 <br />31/2 <br />4 <br />SP <br />SB-09 <br />25+50 <br />3 <br />4 <br />SP <br />SB-10 <br />28+00 <br />4 <br />4 <br />SP <br />SB-11 <br />30+50 <br />3 <br />31/2 <br />SP-SM <br />SB-12 <br />33+00 <br />31/4 <br />31/2 <br />SP-SM <br />SB-13 <br />35+50 <br />7 <br />61/2 <br />SP <br />SB-14 <br />38+00 <br />3 <br />3 <br />SP-SM <br />SB-15 <br />39+67 <br />41/2 <br />3 <br />SP-SM <br />168th Lane NW <br />SB-16 <br />6+50 <br />4 <br />3 <br />SP-SM <br />SB-17 <br />9+00 <br />41/2 <br />21/2 <br />SP <br />SB-18 <br />11+50 <br />2 <br />3 <br />SP-SM <br />SB-19 <br />14+00 <br />31/4 <br />31/2 <br />SP <br />SB-20 <br />16+50 <br />4 1/4 <br />3 <br />SP <br />3 <br />