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<br />I <br /> <br />I <br /> <br />I <br /> <br />City of Elk River <br />Project BN-04-06875 <br />December 8, 2004 <br />Page 3 <br /> <br />I <br /> <br />I <br /> <br />B.3.b. Existing Fill. All of the borings encolllltered existing fill below the pavement section. <br />The existing fill consisted of silty sand, and poorly graded sand with silt, that extended to depths <br />of about 4 to 5 feet. At Borings ST-3, ST-4, ST-6, ST-9, ST-ll and ST-ll, however, the existing <br />fill was not penetrated at the borings' 5 1/2-foot termination depths.. Also, at Borings ST -8 and <br />ST-9, the existing fill at about the 4 1/2- and 2 1/2-foot depths, respectively appeared slightly <br />organic. <br /> <br />I <br /> <br />I <br /> <br />B.3.c. Alluvial Soils. Where the fill was penetrated, the borings ultimately encountered and <br />terminated in alluvial soils consisting of poorly graded sand. <br /> <br />I <br /> <br />B.3.d. Penetration Resistances Penetratien resistances in the existing fill ranged from 2 to lO <br />blows per foot (BPF), indicating it was generally poorly compacted. Penetration resistances in <br />the alluvial poorly graded sand ranged from 2 t08 BPF, indicating it was very loose to loose. <br /> <br />I <br /> <br />I <br /> <br />B.4. Groundwater <br />Groundwater was observed in only four of the borings (ST-2, ST-6, ST-7 and ST-8) on the <br />western portion of the project while driiling. Groundwater was observed at depths of about 4 to <br />41/2 feet after the auger had been withdrawn from the holes in Borings ST-2, ST-6 through ST- <br />8. No water was observed to cave-in depths ranging from 3 1/2 to 4 feet in the remaining <br />borings. Based on these observations, it is our opinion that groundwater in the western portion <br />of the site is located in the range of elevations of about 884 to 888 (below the bottoms of many of <br />our other borings). Seasonal and annual fluctuations of the groundwater levels should be <br />anticipated. <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />C. Analysis and Recommendations <br /> <br />I <br /> <br />c.1. Proposed Construction <br />Mr. Anderson indicated the proposed construction will consist of removing the existing <br />pavement section and replacing it with a new section. The vertical and horizontal alignments <br />will remain approximately the same. However, it is our understanding that 5th Street may be <br />narrowed while Upland and Tipton Avenues may be widened. We also understand that cmb and <br />gutter as well as sidewalks may also be added. Mr. Anderson provided a traffic cOllllt indicating <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br />