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• CONCL.LiSIONS AND RECOMMENDATIONS <br />GENERAL DISCUSSION <br />No geologic conditions were apparent during our reconnaissance which would <br />preclude the site development as planned, provided the recommendations contained herein are fully <br />complied with. Based on our investigation to date and the knowledge of the proposed construction, <br />the site condition which would have the greatest effect on the proposed sedimentation pond # 12 is <br />the presence of lower density, somewhat permeable soils encountered at a depth of 10 to 15 feet <br />below the present ground surface. <br />EXCAVATION <br />Site preparation in all areas to receive embankment fill should begin with the <br />removal of all topsoil, vegetation, and other deleterious materials. Prior to placing any fill, the <br />subgrade should be observed by representatives of Lincoln DeVore to determine if the existing <br />• vegetation has been adequately removed and that the subgrade is capable of supporting the proposed <br />fills. The subgrade should then be scarified to a depth of 10 inches, brought to near optimum <br />moisture conditions and compacted to at least 95% of its maximum standard Proctor dry density <br />[ASTM D-698]. The moisture content of this material should be within + or - 2% of optimum <br />moisture, as determined by ASTM D-698. <br />No major difficulties are anticipated in the course of excavating into the <br />surficial soils on the site. It is probable that safety provisions such as sloping or bracing the sides of <br />excavations over 4 feet deep will be necessary. Any such safety provisions shall conform to <br />reasonable industry safety practices and to applicable OSHA regulations. The OSHA Classification <br />for excavation purposes on this site is Soil Class B. This soil type should be reduced to a Soil Class <br />C if the excavation is left open more than 24 hours, if ground water or very wet soils are encountered <br />or if significant amounts of precipitation occur during the course of excavation, prior to the placement <br />of embankment fill. <br />In general, we recommend all embankment fill in the area of the embankment <br />be compacted to a minimum of 95% of its maximum standard Proctor dry density (ASTM D698). <br />6 <br />