4020 COLBY AVE Geotech Report 2018-01-02 MF Import

AfcDonald's Corporation E-3G76 December 21, 1987 Page 7 percent of maximum density except for the top twelve (12) inches which should be compacted to 95 percent of maximum density. On-site soils at the time of our exploration were near the optimum moisture content and may be used as structural fill provided the grading operations are conducted in dry weather. However, the on- site soils have a significant amount of fines. Thus, compaction and grading will be difficult if the soil moistur.e increases above the optimum moisture content. Therefore, unless the moisture content can be reduced, it may be necessary to use imported granular soil as structural fill. The moisture content can be reduced by aeration in dry weather, or by using lime or cement stabilization. Ideally, structural fill which is to be placed in wet weather should consist of a yranular material with a maximum size of three inche� and no more than 5 percent fines passing the No. 200 sieve. During dry weather, any compactible non-organic soil can be used as structural fill. FIELD EXPIARATION AND LABORATORY TESTING Our field exploration was performed on November 25, 1987 . Subsur- face conditions at the site were explored by drilling five borings to a maximum depth of nineteen (19) feet below the existing grade. The borings were drilled by Associated Dril.ling using a truck-mounted drill rig. Continuous flight, hollow stem augers were used to advance and suppurt the boreholes during sampling. The locations of the borings were approximately determined by taping from existing site features. Elevations were approximately deter- mined by hand level fr.om the southeast corner of the property. The locations and elevations of the borings should be considered accurate oi:ly to the degree iMplied by the method used. These locations are shown on the Boring Location Plan, P1ate 2 . The field exploration was continuously monitored by an engineering qeologist from our firm who classified the soils encountered and maintained a log of each boring, obtained representative sai�ples, and observed pertinent site features. All samples were visually classified in accordance with the Unified Soil Classification System which is presented on Plate 3 , Legend. Logs of the borings are presented on Plates 4 through 8. The final logs represent our interpretations of the field logs and the results of the laboratory examination and tests of field samples. The stratification lines on the logs represent the approximate boundary between soil types. In actuality, the transition may be gradual . Earth Consultants, Inc.