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<br />3 <br /> <br />The strata changes were inferred from the changes in the samples and auger cuttings. The <br />depths shown as changes between strata are only approximate. The changes are likely <br />transitions, variations can occur beyond the location of the boring. <br /> <br /> <br />3.0 RESULTS <br /> <br />3.1 Soil Conditions <br /> <br />Soil borings SB-1 and SB-3 were completed within or near the gravel driveway. Soil boring <br />SB-1 encountered about 5 inches of aggregate that appeared to be a crushed limestone product. <br />The surficial soils at boring SB-3 consisted of silty sand and gravel that was dark brown to <br />black in coloration and did not appear to be an aggregate base material. The material may <br />have initially been placed as aggregate base but may degraded over time, possibly to traffic <br />and/or freeze-thaw cycles. For these reasons the surficial soils at SB-3 were identified as <br />Possible Aggregate Base. <br /> <br />Soil boring SB-2 was completed within the proposed stormwater management area and <br />encountered about 2 feet of sandy lean clay topsoil that was black in color and judged to be <br />slightly organic to organic. <br /> <br />Below the topsoil, aggregate base or Possible Aggregate Base, the soil borings encountered <br />native sandy lean clay glacial till that extended to the termination depths of the borings. The <br />glacial till soils were mostly brown in color. <br /> <br />N-Values within the sandy lean clay glacial till ranged from 5 to 13 bpf with most of the values <br />ranging from about 7 to 10 bpf. These values indicate the clayey glacial till had a rather soft <br />to stiff consistency but were mostly medium to rather stiff. <br /> <br />3.2 Groundwater <br /> <br />Groundwater was not encountered in the soil boring while drilling and sampling or after <br />removing the augers from the boreholes. Groundwater appears to be below the depths <br />explored by our borings. <br /> <br />Water levels were measured on the dates as noted on the boring logs and the period of water <br />level observations was relatively short. Given the cohesive nature of the soils encountered, it <br />is possible that insufficient time was available for groundwater to seep into the borings and <br />rise to its hydrostatic level. Seasonal and annual fluctuations in the groundwater levels should <br />be expected. Groundwater monitoring wells or piezometers in conjunction with deeper soil <br />boring(s) would be required to more accurately determine water levels. <br /> <br />3.3 Laboratory Testing <br /> <br />Laboratory moisture content and percent passing the #200 sieve (P-200) tests were performed <br />on selected samples recovered from the soil borings. Moisture contents within the clayey <br />subgrade soils ranged from about 20 to 26 ½ percent. These values indicate that the soils were <br />likely above their assumed optimum moisture content based on the standard Proctor test. <br />209