5.1. SR 01-17-2006 - Laserfiche WebLink

Home Browse Search

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ~ River SITE FEASIBILITY STUDY GREAT RIVER REGIONAL LIBRARY SYSTEM CITY OF ELK RIVER GEOLOGICAL AND SOILS SURVEY GEOLOGICAL EVALUATION Preliminary geotechnical evaluations for the proposed sites have not been conducted at this time. Before construction, detailed reports will be necessary to provide subsurface soil and groundwater data for the proposed separate sites. Some background information was located and some assumptions have had to be made regarding soil and subsurface conditions. o Site Option A: No explorations were available. The existing library was constructed without major structural implications. Subsurface conditions could likely include old or abandoned foundations or other disturbed conditions. o Soils: Assume that the general soil consisted of fill and/or topsoil overlying sand. Fill due to previous construction is expected to be encountered in the disturbed areas of the site. The topsoil layer for lawns probably is generally 1 to 2 feet thick maximum. o Groundwater: No groundwater or other testing borings were available at this time. Seasonal and annual fluctuations should be anticipated and sand may collect water and cause water to perch. Water seepage from these sand layers may be encountered but is not likely to be a major problem. o Site Option B: A subsurface exploration and geotechnical engineering analysis for the additions to the Elk River City Hall and the Public Safety Building at Orono Parkway was prepared in November of 2001 by STS Consultants. It includes soil borings and an evaluation of conditions encountered at that time. o Reports: The STS Consultants report for borings for the addition located at the northwest corner of the City Hall is useful to project but not define foundation types allowable soil bearing pressures, lateral earth pressures on underground walls, pavement design, and other geotechnical related design and construction considerations. The area explored lies between Orono Lake, which is actually the widening of the Elk River, and the Mississippi River. The area is relatively level, and the report identifies only about 2 Y2 feet maximum difference in elevation for all of the borings. o Soils: One significant boring was #4 within the vacated Orono Road. The vacated roadway must be considered as a significant disturbance from surrounding conditions. Additional borings #2 and #5 indicated 5.5 to 4.5 feet of sand fill. There is likely to be more fill at other locations but it was noted in the report that these fill materials are similar to native sands. The major naturally occurring soil type at this site "commenced at depths of .4 to 5.5 feet below present ground surface, and extended beyond the termination depths of the borings." For density, the "upper portion of the sand tended to be loose, and the lower portion was generally medium dense." KKE ARCHITECTS: 0606.1159.01 SITE FEASIBILITY STUDY REPORT - 26-