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Pimlico Drive Turno:d and Pipeline Prgject Enviro nnu~ntn! Ckecklist Ll'S5 tI1811 1'otentiall~~ Significant Significant with Mitigation Less than Significant Fn jSSUeS h i il i Im act Inrnrpor:rteJ ^ Inipac[ X Impact at s t or so t c) Be located on a geologic un unstable, or that would become unstable as a result of the project, and potentially result in on- or off- site landslide, lateral spreading, subsidence, liquefaction or collapse? d) Be located on expansive soil, as defined in ^ ^ ^ ^ Table 18-1-B of the Uniform Building Code (1994), creating substantial risks to life or property'? e) Have soils incapable of adequately supporting ^ ^ ^ ^X the use of septic tanks or alternative waste water disposal systems where sewers are not available for the disposal of waste water? Discussion a-i, ii) Less than Significant. The proposed project is near but not crossed by active faults. The closest active faults are the Calaveras fault (maximum magnitude 6.8) 6.5 miles north of the project area, the Hayward fault (maximum magnitude 7.1) about 18 miles north west of the project area, and the Grenville fault (maximum magnihlde 6.9) about 19 miles north of the project area. The potential for damage to the project pipelines, underground vaults and fluoridation building by fault offset is remote (DCM Engineering 2005). The project would be subject to potential damage from earthquake ground shaking at the Calaveras fault with a maximum magnitude of 6.8 at a maximum intensity of IX to X of the Modified Mercalli Scale. The California Uniform Building Code (California UBC) is based on the Uniforn~ Building Code (UBC) and has been modified for California conditions with numerous more detailed and/or stringent regulations. Specific seismic safety requirements are set forth in Chapter 23 of the UBC The State earthquake protection law requires that buildings be designed to resist stresses produced by lateral forces caused by earthquakes. The City of Pleasanton implements the requirements of the California UBC through its building permit process. The project has been designed in accordance with foundation and seismic provisions of the 1997 Uniform Building Code as discussed in the project Geotechnical Engineering Investigation Report (DCM Engineering 2005) and the project will he constructed to comply with the applicable codes and standards, to meet or exceed the current seismic Zone 8 requirements. The project also will obtain a building permit from the City of Pleasanton. Effects from ground shaking could be significant but with application of California UBC and project-specific geotechnical report recommendations the risk will be reduced as much as for any pipeline in a seismically active area. Therefore, this would be less than significant. City of Pleasanton 28 Winzler & Kelly Draft Initial Study/Proposed Negative Declaration August 2006 04263501