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Pimlico Drive Tarnont and Pipeline Prgject E~tviroiimentnl Checklist cyuipment and spoils adjacent to the open pipeline trench. Construction will follow Cal/OSHA Construction Safety Orders and regulations adopted by the City of Pleasanton pertaining to excavation safety. Shoring systems will be the responsibility of the contractor who will submit shoring system design to the City for approval prior to implementation. Excavations will also be monitored and documented. The turnout and fluoridation building occur on soils mapped as silts and lean clays with low shrink-swell potential and fat clays with high shrink-swell potential. Borings near the fluoridation building consisted of fat clays. Based upon conclusions in the geotechnical report prepared for the project (DCM Engineering 2005), the near-surface soils at the turnout and fluoridation building sites will shrink and swell with seasonal changes in soil moisture content. The expansive soils can adversely impact the foundations of the fluoridation building and turnout. The project design for the fluoridation building and h~rnout will follow standard recommendations in the geotechnical report (DCM Engineering 2005) to provide a low level of risk with regard to potential impacts of expansive soil. These will be accomplished through a combination of removal and replacement of expansive soils, moisture control and moisture conditioning and site drainage. 1'he methods identified in the geotechnical report will be incorporated into the final design and implemented during project construction and thereby reduce the impacts to less than significant. e) No Impact. The project will provide public infrastnichire for water service. There will not be septic systems or alternative waste water disposal systems within the project. 'T'herefore, this would be no impact. City of Pleasanton 30 Winder & Kelly Draft Initial Study/Proposed Negative Declaration August 2006 04263501