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<br />City of Redwood City <br /> <br />Redwood Shores Lagoon/Belmont Slough Pump Station <br /> <br />investigation and our conclusions and geotechnical recommendations for design of the proposed <br />improvement. Our report will include a site plan, boring log, and laboratory test data in addition to the <br />following: <br />Site Conditions: We will review and summarize the surface, subsurface, and ground water conditions and <br />the engineering properties of the soils encountered during the site investigation. <br /> <br />Geologic Hazard Review: We will prepare a geologic hazards review for the site. We will discuss the <br />regional seismicity including regional active faults, maximum estimated ground shaking for seismic events. <br />We will provide a regional fault map showing the proximity of the site to major Bay Area faults within 100- <br />km of the site. We will provide a list of historic earthquake epicenters within 100-km of the site, including <br />the magnitude and acceleration. We will also present 2007 CBC Near-Source Site Seismic Coefficients for <br />structural design. Liquefaction potential, lateral spreading, differential seismic compaction, and ground <br />shaking will also be evaluated and addressed in the report. <br /> <br />Foundations: Utilizing the data collected during our investigation, we will recommend a suitable foundation <br />type for the proposed discharge chamber. We will also provide foundation design criteria including <br />recommendations for minimum size, embedment depth, allowable vertical and lateral capacities, and <br />expected total and differential settlements. <br /> <br />Slabs: We will present slab criteria, including recommendations for subgrade preparation, and reducing <br /> <br />moisture rise through slabs. <br /> <br />Earthwork: We will present earthwork criteria, including recommendations for clearing and site <br />preparation, subgrade preparation, compaction, materials for fill, utility trench backfill, surface drainage and <br />landscaping considerations, as necessary. <br /> <br />Retaining Walls: We will present retaining wall design criteria, including recommended foundation type, <br /> <br />lateral earth pressures, drainage, and backfill. <br /> <br />Soil Corrosivity Screening: We will submit two soil samples, collected from our borings to an analytical <br />laboratory to measure the pH levels, resistivity, chlorides, and sulfates. If the test results indicate a potential <br />for severe corrosion, we can contract with a Corrosion Engineer to perform additional evaluation and design, <br />if desired. <br /> <br />SCHEDULE <br /> <br />We are prepared to begin work upon receiving your written approval of this agreement. In anticipation of <br />your authorization, we have contacted our drilling contractor's regarding this project. We anticipate drilling <br />the boring on December 10, 2009, and having the report completed by December 31, 2009. <br /> <br />CTRC <br /> <br />Page 3 <br />172484 <br />