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File No. 20-3821-O1.G01 h� KLEI N FELDER January 6, 1995 consistency from medium dense to dense and partially-cemented sand and hard to partially- cemented sandy silts and clays. Groundwater was not encountered in any of the three borings drilled in the general vicinity of the building pad; however, in the deep boring drilled for the storm pond basin, groundwater was encountered at approximately 291/2 feet below existing ground surface. Groundwater conditions may vary at the site in the future due to variations in rainfall, groundwater withdrawal, construction activities, or other factors not apparent at the time our borings were i drilled. The above is a general summary of the soil and groundwater conditions encountered in the exploratory borings drilled. More detailed descriptions of the soils encountered in the borings are noted on the Logs of Borings. All soils have been classified according the Unified Soil Classification System which is described on Plate A-2 of the appendix. VII. LABORATORY TESTING Laboratory tests were performed on selected samples obtained from the exploratory borings in order to evaluate the moisture and gradation characteristics of the soils encountered. We attempted to perform strength tests on the samples, but the samples were too disturbed for that type of testing. The tests performed consisted of Moisture Content and percent passing No. 200 Sieve. In addition, one bulk sample was obtained for R-Value testing for pavement section design calculations. The test results, with the exception of the R-Value, are noted on the Logs of Borings at the corresponding sample locations. The R-Value test results are summarized on j Plate A-7. I VIII. CONCLUSIONS AND RECOMMENDATIONS ( 1. Foundations 1 We recommend that the structures be supported on spread or continuous foundations bearing on the existing soils or on Engineered Fill. We recommend that foundations extend a minimum depth of 12 inches below the lowest adjacent finished soil subgrade, interior or exterior, whichever controls. We anticipate that loose soils may be exposed at the bottom of portions of the foundation excavations. In order to provide more uniform foundation support, we recommend that the upper 12 to 18 inches of soil at the site be compacted prior to excavating foundations. If any extremely loose or soft soil pockets are encountered, they should be overexcavated and recompacted as described in the "Site Preparation and Grading" section of this report. With the above provisions, the recommended maximum allowable soil bearing pressure for the structures bearing on the existing soils is 2,000 pounds per square foot (psf) for dead plus live loads. If a higher bearing value is desired, foundations can be underlain by a minimum of 2 feet of compacted Engineered Fill beneath the bottom of the foundations. Engineered Fill should extend at least 2 feet laterally beyond the foundations to help provide more-uniform Copyright 1995 Klcin(elder, Inc. Page 3 or