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t � <br /> Page 5 - #4220 92-4026 <br /> or masonry block construction with steel trussed roof for the larger public works building. Based on this <br /> type of construction, we anticipate column loads of less than 100 kips, and structural wall loadings <br /> varying betweea 2 and 6 kips per linear foot. <br /> Our design recommendations are based on providing a minimum factor of safety of at least three against <br /> a general shear failure, and limiting total and differential settlement to 1" and 1/2", respectively. <br /> 3.2 Discussion <br /> Groundwater levels as high as 1019' were recorded at some of the boring locations. As a result, a review <br /> should be made of a potential 100-year storm high groundwater level in order to maintain an acceptable <br /> clearance between the finished floor elevation and the highest potential groundwater. Based on the <br /> cunent groundwater conditions, we estimate an average elevation of approximately 1018'. <br /> Relatively soft and wet soil conditions near the surface will require excavatioas to depths of 4' to 5' in <br /> the council chamber, city office and police station azea and on the order of 2'.to 4' at the public works <br />` facility. Because of the relatively high water table, it will be necessary to perform some of the excavation <br /> below the water table. Because of the sensitive nature of the soils to be left in-place, it will be necessary <br /> to perform the excavation with a backhoe or dragline type of equipment. <br /> Relatively clean sand will be requirerl as a fill material near the groundwater. Reuse of the excavated <br /> material will most likely not be feasible since it is anticipate� that it will be in a very moist to wet <br />_ condition. Significant aeration and drying would be required in order to make this a suitable structural <br />- borrow material. � . � <br /> a � <br /> � twsn c�t� test�nq� <br /> CQfOCf?�Y_iC�ll <br />