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Cartleridge Trailhead Addendum minimal impact on the project site, including site topography and soil conditions. The proposed restroom building would have "vault toilets," avoiding the need for greater ground disturbance to connect to existing City wastewater infrastructure. The construction site would be reseeded with native grasses after the completion of the project, reducing the potential for long-term erosion. 5.7. GREENHOUSE GAS EMISSIONS Construction of the project would temporarily generate the emission of greenhouse gasses (GHGs). Construction activities would involve the use of heavy equipment and require workers to drive to and from the project area. However, construction activities would occur for a limited duration, and would be of limited scope, and would not generate significant GHG emissions. The project contractor would be required to implement basic construction management practices to control emissions and dust. The mission statement of the East Bay Regional Park District is to promote the use of outdoor recreation areas. The acquisition of the Castleridge Property helps to fulfill this mission, and assists in protecting this land from potential future urban development. To the extent that the project helps preserve the grassland and forest cover of the Castleridge Property, it would promote carbon sequestration. In addition, the proposed trail access promotes pedestrian-friendly use of the Castleridge Property (e.g. hiking), which would not contribute to cumulative GHG emissions. The trail access would also create more convenient access to Pleasanton Ridge from Pleasanton, therefore offering the potential for reduced vehicle miles traveled and associated GHG emissions. 5.8. HAZARDS AND HAZARDOUS MATERIALS During construction of the trailhead, potentially hazardous liquid materials such as oil, diesel fuel, gasoline, and hydraulic fluid could be used at the site. If spilled, these substances could pose a risk to the environment and to human health. In the event of a spill, the Livermore-Pleasanton Fire Department is responsible for responding to non-emergency hazardous materials reports. The use, handling, and storage of hazardous materials is highly regulated by both the Federal Occupational Safety and Health Administration (Fed/OSHA) and the California Occupational Safety and Health Administration (Cal/OSHA). However, the construction of the trailhead is not expected to result in the use of significantly hazardous materials. The use and operation of the trailhead is not associated with any hazards or hazardous material, and disposal of sewage from the restroom facility would be picked up and disposed of appropriately. 5.9. HYDROLOGY AND WATER QUALITY The proposed trailhead would not result in significant impacts to hydrology and water quality. No modifications are proposed that would degrade water quality, violate any water quality standards or waste discharge requirements, substantially deplete groundwater supplies, or substantially alter the existing drainage pattern of the site. The proposed modifications to accommodate up to 50 parallel parking spaces are minimal, as the parking spaces would be located along the already-paved Old Foothill Road. The proposed driveway approach and restroom facility have been designed to minimize grading of the existing site terrain. No swales, creek, or wetlands would be modified as part of the project and best management practices would be implemented during the construction period to protect stormwater quality. June 9,2016 12