Laserfiche WebLink
August 28, 1991 BALBI&CHANG ASSOCIATES <br /> File No. 1525-69 <br /> I. Surface Drainage <br /> Final elevations at the site should be planned so that drainage is directed away from all <br /> foundations, and final building pad elevation should be at least one foot above 100-year flood <br /> plane. Paved areas should be sloped and drainage gradients maintained to carry all surface <br /> water off the site. Continuous roof gutters are recommended for all proposed structures. All <br /> down-spouts should be connected to non-perforated drain pipes or other appropriate drainage <br /> structures that can carry collected rain water away from the building foundations. Ponding <br /> of water or concentrated seepage should not be permitted under the building or adjacent to <br /> the foundations system and paved areas. <br /> J. Seismic Consideration <br /> I <br /> Based on the review of available geologic literatures, there is no active fault trace traverse <br /> the project site and the site is not within an Alquist-Priolo Special Study Zone. The <br /> probability of fault related seismic hazards such as fault creep, surface rupture, or differential <br /> displacement due to faulting is considered to be low. However, central California is a region <br /> of high seismic activities with numerous active faults. The primary seismic hazard of this <br /> site is strong ground shaking during earthquakes generated by active faults in central <br /> tin California. <br /> It is our opinion that the proposed structures could be subjected to strong ground shaking <br /> during its useful life. The effects of ground shaking ori-the proposed structures may be <br /> mitigated by design and construction detailing in accordance with applicable seismic <br /> provisions of seismic zone "3" and site coefficient of "S," as specified in the 1988 edition of <br /> Uniform Building Code. <br /> K. Plan Review and Construction Observation f <br /> Continued coordination between the design engineer and our firm is recommended to assure C <br /> that the design is compatible with the soils conditions defined by this investigation. All final <br /> designs of foundation system, retaining walls, and grading plans should be reviewed and/or <br /> approved by our firm or a qualified geotechnical engineer prior to construction. <br /> } <br /> Page 15 of 17 <br /> I <br /> L <br />