AgdaPkt 2018-05-21 Joint SA PFA - Laserfiche WebLink

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353 Main Street Apartments Redwood City, California May 1, 2018 (Original Report Dated November L8,20L6) Preliminary geotechnical recommendations for site preparation and grading, foundations, slabs- on-grade and exterior flatwork, utility trench backfill, site drainage and finish improvements, and geotechnical observation and testing are presented to guide the development of project plans and specifications. lt is our intent that this report be used by the client to form the geotechnical basis of the design of the project as described herein, and in the preparation of plans and specifications. Detailed evaluation of the site geology and potential geologic hazards, and analyses of the soil for infiltration rates, mold or other microbial content, asbestos, radioisotopes, hydrocarbons, or other chemical properties are beyond the scope of this report. This report also does not address issues in the domain of contractors such as, but not limited to, site safety, loss of volume due to stripping of the site, shrinkage of soils during compaction, excavatability, shoring, temporary slope angles, and construction means and methods. Ancillary features such as temporary access roads, fences, light poles, and non-structural fills are not within our scope and are also not addressed. To verify that pertinent issues have been addressed and to aid in conformance with the intent of this report, it is requested that final grading and foundation plans be submitted to this office for review. ln the event that there are any changes in the nature, design, or locations of improvements, or if any assumptions used in the preparation of this report prove to be incorrect, the conclusions and recommendations contained herein should not be considered valid unless the changes are reviewed and the conclusions of this report are verified or modified in writing by the geotechnical engineer. The criteria presented in this report are considered preliminary until such time as they are verified or modified in writing by the geotechnical engineer in the field during construction. 2.O GEOLOGIC SETTING The site is mapped by Pampeyan (L993) as being underlain by artificial fill (Holocene) described as "poorly consolidated to well-consolidated gravel, sand, silt, and rock fragments in various combinations used in a variety of applications including highway, railroad, and road fill, earth-fill dams and embankments, and building-site grades". The artificial fill is underlain by Bay Mud (Holocene) described as "very poorly consolidated to well-consolidated, bluish-gray to black, organic clay and silt, with lenses of sand and shell and layers of peat". The USGS Working Group on California Earthquake Probabilities (WGCEP) (1995; cited in WGCEP 2008) originally classified seismic sources in California as either Type A, B, or C. The L997 Uniform Building Code and the 200L California Building Code (CBC) adopted these designations and 2301842-001 16L0-038.SER.REV2 7.B. - Page 60