13 ATTACHMENT 03 - Laserfiche WebLink

Pleasanton Gateway— Environmental Checklist Discussion a,e,f) The project's drainage systems will be reviewed by the City Engineer to ensure that the velocity of the runoff is slowed. The landscape areas facing the perimeter areas of the site and adjoining the main access driveways are required, by a project condition of approval, to be designed and graded to function as bio- retention swales. The paved areas of the site will be designed and graded to drain to the bio- retention swales and then piped to the detention ponds on the City's park land for further treatment before being discharged to the Arroyo de la Laguna. The bio- swales will be augmented with "filterra" control systems in compliance with the RWQCB /NPDES standards. The ponds were designed, sized, and constructed to handle the stormwater runoff from the entire Bernal Avenue Specific Plan area including the development of this site. The applicant is required to submit to the City an analysis of the Weir structure before issuance of the first building /onsite permit for the project, The project will be required through the building permit and construction process to incorporate best management practices for discharges resulting from this development. The proposed project shall be subject to the most recent requirements of the San Francisco I3ay Area Regional Water Quality Control Board (RWQCB) and to the requirements of the Alameda County NPDES Permit. Therefore, this would be a less - than - significant- impact. b) The project will not use ground water for this project. All existing wells have been abandoned pursuant to the Alameda County Department of Environmental Health. The development of this project does not anticipate a loss of groundwater recharge potential. Therefore, this would be considered no- impact. c -d) The proposed development will not alter the alignment or stability existing drainage pattern of the Arroyo de la Laguna from its existing condition. As previously reviewed and approved by the Bernal Property Specific Plan, Final EIR and PUD development Plan, all stormwater will be pretreated and discharged to the City's stormwater detention ponds before discharge into the Arroyo. Therefore, this would be considered no- impact. g, h, i) The site's elevation and topography is well -above the 100 -year flood elevation ensuring that people and structures will not be exposed to a significant risk of loss, injury or death involving flooding. Therefore, this would be considered no- impact. j) The City of Pleasanton is not at risk from seiche or tsunami. There are no identified mudflows or potential mudflows on the site. The site will support the proposed development with the proper engineering practices used in the design and construction of building sites and infrastructure. Therefore, this would be considered no- impact. Page 38 of 52 Pleasanton Gateway Initial Study August 2, 2010