Terraphase Engineering CSA Amnd 1 20231117

Home

Consulting Services Agreement between City of San Leandro and Last revised 8/4/2023 Terraphase Engineering Inc. for Pedestrian Bridge Removal Permitting Support Exhibit A – Page 1 of 3 EXHIBIT A SCOPE OF SERVICES The proposed Project is the removal of large fallen Eucalyptus trees and a destroyed/collapsed approximately 100-foot span pedestrian bridge that connects Haas Avenue to Cary Drive. The Project site is located where Haas Avenue dead ends at San Leandro Creek. McGuire and Hester Project Description: Installation of upstream and downstream cofferdams, with a bypass system in place to bypass existing water flows. After the bypass is in place, best management practices (BMPs), will be installed along with a fabric covering under the bridge to catch debris. At the end of Cary Drive, an excavator will be mobilized. The fallen trees will be pulled out of the creek, cut, loaded, and off hauled from the Cary Drive side. The Haas Avenue side with have the small limbs and brush removed, as well as the damaged portion of the guardrail. After removal of the trees, a portion of the Cary Drive chain link fence will be removed to provide access into the creek area to track the excavator down. From a position in the creek level with the damaged bridge, the excavator will selectively demolish and haul out the bridge in pieces up to Cary Drive. The tree and bridge removal work has an expected work duration of 8 days. Both the tree and bridge sections will be placed on the asphalt pavement portion of Cary Drive and demolished into smaller sections, loaded into trucks, and hauled away. After removal of the tree and bridge, the creek will be picked clean of any fallen debris, site BMPs will be removed, and the area will be appropriately re-vegetated. The Project will temporarily impact San Leandro Creek and impacts to waters of the State will occur within 50’ upstream and downstream of the footprint of the fallen tree and bridge. The Project will not have permanent impacts to waters of the State. Temporary construction impacts associated with the use of heavy construction equipment (e.g., excavator) will occur between the edges of the creek banks between Haas Avenue and Cary Drive and associated with the installation and removal of proposed temporary upstream and downstream cofferdams and water diversion system. The tree removal and removal of the destroyed bridge will impact the creek and associated riparian habitat at and within 50 feet upstream and downstream the fallen tree and bridge. We understand the City has discussed the proposed Project with Mr. Brian Wines at the San Francisco Regional Water Quality Control Board (RWQCB) and that he has confirmed that the following series of environmental permits and associated biological evaluations (listed below) will be required to support implementation of the Project. He has also indicated the following: “If the access roads cannot avoid impacting shrubs and trees, then we would ask for mitigation for impacted shrubs and trees. We would require that shrubs and trees removed for equipment access be replaced at a 3:1 ratio. Shrubs must be monitored for at least five years after planting and trees must be monitored for at least 10 years after planting. We would require a monitoring and maintenance plan (MMP) with performance criteria for the replacement of shrubs and trees. If the performance criteria are not attained, then monitoring and maintenance would continue until the criteria are attained. The MMP should also address replacement of any grasses and forbs impacted by equipment access.” This scope of work will support the acquisition of required permits for the proposed Project (described above) from the U.S. Army Corps of Engineers (USACE), Regional Water Quality Control Board (RWQCB), California Department of Fish and Wildlife (CDFW), and to support compliance with the California DocuSign Envelope ID: 45519D52-DFE2-45A6-B4FF-CBB06B787077DocuSign Envelope ID: 2B3F7F3C-6A3F-47A3-9F66-804614F6D7BA