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3. Based on these anticipated soil conditions and the relatively light structural loads associated with the proposed one-story structure, the buildings could most likely be supported on shallow foundations consisting of either grid footings or mat foundations. Therefore, our scope of services that follows was developed to provide shallow foundation recommendations. Geolo~ic H:J7;¡rds: We would discuss on a reconnaissance level, the potential geologic hazards at the site, including liquefaction, lateral spreading, differential seismic compaction, fault rupture, and ground shaking. Seismicity: We would discuss the regional seismicity including regional active faults, maximum estimated ground shaking, maximum past ground shaking, and future earthquake probabilities. We would provide a regional fault map showing the proximity of the site to major Bay Area faults within 100-km radius of the site. Settlements: Since the site is underlain by highly compressible Bay Mud, we would estimate the future site settlement, taking into account the weight of the existing fill and any additional fill proposed. This information will be required for development of the surface drainage and underground utility design. Foundations: Utilizing the data collected during our investigation, we would recommend suitable foundation types for the planned fire station. We would include alternatives for both shallow and deep foundation types. We would provide foundation design criteria including recommendations for minimum size, embedment depth, allowable vertical and lateral capacities, and expected total and differential settlements. Slabs-on-Grade: We would present slab-on-grade criteria, including recommendations for sub grade preparation and minimizing moisture rise through slabs-on-grade. Earthwork: We would present earthwork criteria, including recommendations for clearing and site preparation, sub grade preparation, compaction, materials for fill, reuse of on-site materials, temporary and permanent cut and fill slopes, utility trench backfill, surface drainage and landscaping considerations, as appropriate. Retainin~ Walls: We would present retaining wall design criteria, including recommended foundation type, lateral earth pressures, drainage, and backfill. Pavements: We would present flexible asphaltic concrete pavement sections for traffic indices ranging from 4.0 to 6.0. We would also present Portland Cement concrete pavement sections for the anticipated fire truck traffic. Pavement design would be based on results of R-value testing and the expected properties of import soils. Project Meetin~s: We would attend two project meetings at no more than four hours each, including travel from our office. 4. 5. 6. 7. 8. 9. 10. 11. Page 5 of 9