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12/06/06 WED 18:02 FAX 727 867 9455 WillinghamCompanies ~007 4'''' . i' I' ~ , . I., .. '. . '1 Zephyrhllls Pro....ionlll Center Site Pasco County, Florida GDE Job No. 05-432 Page 3 the N-value, Through this technique, the upper ten feet of the soil was sampled continuously. Detailed descriptions of the soils encountered during the SPT borings are presented in the Soil Profiles (Fig:3). Soil Sample Handling and Classification The soil samples obtained during the SPT borings were placed in sealed containers to retain moisture and returned to our laboratory, The samples were then reviewed by our project staff to confirm 1:;lassifications, visually estimate the relative percentages of the soil's constituents (sand, clay, etc,), and identify pertinent structural features. The stratification lines shown on the boring records represent our interpretation of approximate boundaries between soil types. The transition between strata may be !~radual. Our classifications are based on a visual estimation of the soil properties and our engineering experience with the soils found in this geologic area. Results Subsurface Conditions Soil Borings The borings generally encountered clean, silty, slightly clayey to clayey sands to an approximate depth of 25 feet below existing grade. Please note that the SPT -N values are presented adjacent to the soil profiles on Figure 3. The correlation of the SPT-N values with relative density, unconfined compressive strength and consistency are provided in the following table: CoarseoGrained Solis Fine Grained Solis Penetration Resistance N Penetration Unconftned (bIowsIft) Relative Density of Send Resistance N CcHr'PIlISSive Strength Consistancy of IblowsJftl of Clav Itonslfl21 Clav 0-4 Very Loose <2 <0.25 Very Soft 4-10 Loose 2-4 0.25-0,50 Soft 10-30 Medium-Dense 4-8 0.50-1,00 Medium 30-50 Dense 8-15 1,00-2.00 Stiff >50 Very Dense 15-30 2.00-4.00 Very Stiff >30 >4,00 Hard c Groundwater Groundwater was encountered at approximate depths of 9 to 10 feet below ground surface in the soil test borings that were performed iO August of 2005. Based on our petst site experience, the results of our investigation and review of the SCS soil survey, it is our llpinion that the seasonal high groundwater table will be encountered approximately 7 feet below e):isting ground surface across the site. Surveyed elevations were not available at the time of this repclrt. Significant fluctuations in the groundwater levels should be expectl:td due to seasonal variations in rainfall, runoff, and other site-specific factors. Laboratory Testing Our field representative sealed and returned the soil samples to the GDE commercial where a geotechnical engineer further examined them. We visually classified the soils according to the Unified Soil Classification System (ASTM D 2487). The resulting soli descriptions are shown on the attached drafted Soil Profiles (Figure 3),