RES 99074 - Laserfiche WebLink

Changes or alterations have been required in, or incorporated into, the project which mitigate or avoid the significant effects on the environment. Facts in Support of Finding The City of Pleasanton has adopted the following measures which will reduce potential public health and safety impacts to a less-than-significant level: Mitigation Measure 4.9-2: Landfill Hazards. A Health Risk Assessment (HRA) shall be prepared for the City by a qualified health risk professional for use of Lot 14 as a City park. The HRA shall evaluate the existing data on air, soil, and water quality fi-om the site to determine if additional sampling and testing is required. The HRA shall be prepared in conformance with U.S. Environmental Protection Agency (EPA) and CalEPA guidelines. If the HRA indicates that park use of the site is appropriate, the Parks and Recreation Department shall prepare a worker Health and Safety Plan for development, operation, and maintenance of the proposed park. If the HRA concludes the site has unacceptable health risks, then either (1) a remedialion plan shall be prepared for approval by U.S. EPA and CalEPA, and the specified remediation measures shall be implemented; or (2) the Plan shall be modified to accommodate another use. SIGNIFICANT EFFECT Impact 4.9-3 Release of Landfill Gas. The generation of methane gas within the old landfill site on Lot 14 presents the potential for exposure of the public using the proposed park and adjacent residents to the risk of fire, explosion or the release of methane gas in the event of the rupture of components of the existing collection system. This would be considered a potentially significant impact. Changes or alterations have been required in, or incorporated into, the project which mitigate or avoid the significant effects on the environment. Facts in Support of Finding The City of Pleasanton has adopted the following measures which will reduce potential public health and safety impacts to a less-than-significant level: Mitigation Measure 4.9-3: Release of Landfill Gas. The City shall attempt to obtain as-built drawings of all components of the methane gas collection system on Lot 14. These records shall be maintained at the Building Inspection Department to ensure that any excavations made during park construction or operation do not rupture components of thc system. Thc Depa~ci~cnt shall establish a protocol for all excavation activities (including drilling) that require the evaluation of the gas collection system drawings prior to the commencement of activities. All aboveFound components of the methane gas collection system shall bc protected with lockcd fences or other secure enclosures to prevent public contact with thesc facilities for as long as they arc needed. Vineyard Avenue Corridor Specific Plan Draft EIR -27- Findings