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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />November 13,2006 <br />Project 06-507A <br />2007 Street Reconstruction <br />Irving A venue Area Improvements <br />Elk River, Minnesota <br /> <br />Water Level Observations: <br />Observations of the subsurface water conditions were made during drilling operations. <br />- - - -- -- -- - - -- . - - -- _. - <br />-. - -.. -. - - - -. - - - --. - -. + + _. - - - -. - - - -. - -. - - - - - - - -- <br />Groundwater was not encountered in any of the borings during drilling. Although the water <br />levels were observed over a short period of time, we feel they are an accurate <br />representation of the water levels on this site at the time of our exploration because of their <br />high permeability. It should be noted that fluctuations in the level of the groundwater can <br />occur due to variations in rainfall, temperature, spring thaw and other factors not evident at <br />the time of our investigation. <br /> <br />Mottled soils were not observed. Mottled soils are a historical indication of a temporarily <br />or seasonally saturated soil condition. Grey soils were also not observed. Grey soils are an <br />indication of a permanently saturated soil condition. <br /> <br />c. Engineering Review <br /> <br />Discussion: <br />Based on our fmdings, this site appears to be well suited for the proposed street <br />reconstruction. The existing soils on this site are suitable for support of the utility pipes <br />and structures. The sand soils encountered on this site consisting of clean, poorly graded <br />sand (8P), poorly graded sands with silt (SP-8M) and silty sand (SM) are excellent for <br />bituminous pavement support. We do not foresee any unusual soil conditions during <br />construction. The subgrade soils are loose and should be compacted and tested to verify <br />compaction to 100% of standard proctor maximum density prior to placing the aggregateubase. <br /> <br />Page 4 <br />