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Phelan Development Holly Master Plan - Buildings H & 1 <br /> 15188.000.006 Geotechnical Exploration <br /> 5.8 SITE DRAINAGE <br /> 5.8.1 Surface Drainage <br /> The project civil engineer is responsible for designing surface drainage improvements. With <br /> regard to geotechnical engineering issues, we recommend that finish grades be sloped away from <br /> buildings and pavements to the maximum extent practical to reduce the potentially damaging <br /> effects of expansive soil. As a minimum, we recommend the following. <br /> 1. Discharge roof downspouts into closed conduits and direct away from foundations to <br /> appropriate drainage devices. <br /> 2. Do not allow water to pond near foundations, pavements, or exterior flatwork. <br /> 6.0 FOUNDATION RECOMMENDATIONS <br /> Building H may be supported upon conventional footings with slab-on-grade for native soil existing <br /> on site, prepared in accordance with recommendations in Section 3.2. Building I may be <br /> supported on conventional footings with slab-on-grade construction. Due to the extent of <br /> non-engineered fill located below Building 1, it may be cost effective to perform alternative ground <br /> improvement methods in lieu of removing the existing fill prior to foundation construction. We <br /> developed structural improvement recommendations using data obtained from our field <br /> exploration, laboratory test results, and engineering analysis. <br /> 6.1 GROUND IMPROVEMENT <br /> As an alternative to complete removal of undocumented fill in the vicinity of Building I, ground <br /> improvement, such as soil replacement columns, may be utilized to improve the bearing a <br /> capacity of the soil. Based on anticipated loads and correspondence with a representative of <br /> Geopier, ground improvement could be performed to meet the structural requirements with <br /> respect to bearing capacity and differential settlement without removing and replacing the existing <br /> fill. <br /> 6.2 CONVENTIONAL FOOTINGS WITH SLAB-ON-GRADE <br /> The proposed structures can be supported on continuous or isolated spread footings bearing in <br /> competent native soil or compacted fill. <br /> 6.2.1 Footing Dimensions and Allowable Bearing Capacity <br /> Provide minimum footing dimensions as follows in the Table 6.2.1-1 below. <br /> TABLE 6.2.1-1: Minimum Footing Dimensions <br /> FOOTING TYPE *MINIMUM DEPTH MINIMUM WIDTH <br /> (INCHES) (INCHES) <br /> Continuous 24 18 <br /> Isolated 24 24 <br /> below lowest adjacent pad grade <br /> ENGEOPage 116 December 13, 2021 <br /> Expect Excellence- <br />