ORD 1503 - Laserfiche WebLink

f. The applicant's geotechnical engineer shall conduct a detailed technical analysis in order to evaluate the effectiveness of various foundation designs. g. The expansive and/or corrosivity nature of the soil shall be determined prior to grading by laboratory testing. h. After rough grading has been completed the soil on each lot shall be evaluated by the soil engineer for expansion potential with the aid of additional laboratory testing. The results of this evaluation (i.e. uplift pressures) shall be incorporated into the final foundation design for each lot. 18. Seismic Activity a. In conjunction with any tentative map application, all active faults which could impact the site through strong ground shaking shall be tabulated. The maximum credible earthquake magnitudes shall be listed as well as the peak horizontal ground accelerations which can be expec~t~d to impact structures. The peak and repeatable horizontal ground accelerations which can be expected to impact the site should be evaluated to determine requirements for building design based on minimum Uniform Building Code Requirements. b. All potentially active faults shall be identified on the site and included with any tentative map application. Geologic investigations, including trenching, shall be conducted by the certified engineering geologist to confirm the absence of boundaries before permitting construction of structures for human occupancy within zone boundaries. The certified engineering geologist shall recommend necessary setbacks. c. Roads, bridges, and utility lines which cross an active fault trace shall be designed and constructed in a manner that recognizes potential surface displacement during. a Magnitude 6.3 event. Water, gas, and electric lines shall be equipped with flexible connections and automatic shut-off devices which operate if service is interrupted. d. No structure for human occupancy shall be located on or within the 50 foot building setback to a fault or fault splay. e. A design level analysis of potential liquefaction under assumed high ground water conditions and seismic load generated by a Magnitude 6.3 event shall be conducted. Appropriate mitigation measures, if applicable, shall be developed. 19. Erosion a. "State of the practice" construction methods for hillside developments shall be followed during grading operations to control wind and water erosion.