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�} <br /> � � Mr. Charles Thompson <br /> ` Project BL-04-05907 <br /> � October 27,2004 <br /> . Page 10 <br /> , <br /> � <br /> � <br /> C.8. Site Grading and Drainage <br /> r We recommend the site be graded to provide a positive run-off away from the proposed building. We <br /> � recommend landscaped areas be sloped a minimum of 6 inches within 10 feet of the building and slabs be <br /> ■ sloped a minimum of 2 inches. In addition, we recommend gutters and downspouts with long splash <br /> blocks or extensions. <br /> � <br /> ■ C.9. Utilities <br /> � C.9.a. Materials. Glacial till or alluvial soils are anticipated at assumed utility elevations and are <br /> � generally suitable for pipe support. The exceptions(as discussed above)occur at the east side of the site, <br /> at Borings ST-4, ST-10, ST-11 and ST-12. We do not recommend that utilities enter the site from that <br /> � area. <br /> � <br /> ■ Due to the possibility of perched groundwater and rather soft clays being encountered, imported granular <br /> bedding with a maximum particle size of 3/4 inch and sump pumps may be necessary, if areas of <br /> � localized perched groundwater are encountered, to facilitate the installation of utilities. <br /> � C.9.b. Backfilling and Compaction. We recommend trench backfill above the bedding be compacted <br /> � to a minimum of 90 percent in landscaped areas and 95 percent beneath proposed slabs and pavements. <br /> ■ Within the upper 3 feet of pavement areas, it should be compacted to 100 percent,however. <br /> � C.10. Pavements <br /> � <br /> . C.lO.a. Subgrade Preparation. The subgrade preparation should consist of removal of all surficial <br /> vegetation and topsoil. As discussed earlier,the east portion of this site has soil conditions consisting of <br /> � previously-placed fill soils over substantial depths of organic soils. Organic soils tend to consolidate and <br /> � potentially decompose over time which can lead to subsidence of the ground surface. Based on the soil <br /> borings in this area, it appears that the deeper deposit of organic soils have experienced some <br /> � consolidation; however,they typically are still in a very loose or very soft condition. The overlying fill <br /> � soils would appear to be somewhat stable and would likely provide�a near-surface stable subgrade for the <br /> pavements. However,the owner must be aware that if pavements and drives are constructed on the <br /> � existing soil conditions, areas of long-term sagging and potential pavement break-up and distress could <br /> , occur. The costs associated with a very deep soil correction would typically not be considered prudent <br /> for support of pavement areas. <br /> � <br /> � ' <br /> � <br />