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M03106GE <br />• 2.3 Subsurface Conditions <br />The subsurface exploration consisted of observing, describing and <br />sampling the soil materials encountered in fourteen (14) auger <br />advanced test borings. The approximate locations of the test <br />borings are shown on Figure 2. The logs describing the soil <br />materials encountered in the test borings are presented in Appendix <br />A. <br />The soil materials encountered in the test borings consisted <br />generally of various mixtures of sandy and gravelly clay material <br />with varying amounts of cobbles and boulders to a depth of about <br />sixty (60) feet. The sandy and gravelly clay soils tested have a <br />low to moderate swell potential when wetted and may consolidate <br />under light to moderate loading conditions. <br />Formational material was encountered in test boring 3 only at a <br />depth of about fourteen (14) feet. The formatibnal material <br />encountered in test boring 3 was a silty clay shale. No format- <br />ional material was encountered in the remaining test borings to a <br />depth of about sixty (60) feet, the maximum depth explored. <br />No free subsurface water was encountered in the test borings at <br />'the time of our field study. <br />It is difficult to predict if unexpected subsurface conditions <br />will be encountered during construction. Since such conditions may <br />be found, we suggest that the owner and the contractor make provi- <br />sions in their budget and construction schedule to. accommodate <br />unexpected subsurface conditions. <br />3.0 ON-SITE DEVELOPMENT CONSIDERATIONS <br />We anticipate that the subsurface water elevation may fluctuate <br />with seasonal and other varying conditions. Deep excavations may <br />encounter soils that tend to cave or a possibility of .subsurface <br />water. If water is encountered, it may be necessary to dewater <br />construction excavations to provide more suitable working condi- <br />tions. Excavations should be well braced or sloped to prevent wall <br />collapse. Federal, state and local safety codes should be ob- <br />served. All construction excavations should conform to Occupation- <br />al Safety and Health Administration (OSHA) standards or safer. <br />4.0 DISCUSSION AND RECOMMENDATIONS <br />This section of the report presents the results of our findings <br />and geotechnical engineering suggestions and recommendations for <br />the design and construction of the embankment fill. <br /> <br />3 <br />Lambert anD ~,s•,oociate,s <br />CONSULTING GEOTECN NICAL ENGINEERS ANO <br />MATERIAL TESTING <br />