Schaaf & Wheeler CSA 20231106 - Laserfiche WebLink

Home

Consulting Services Agreement between City of San Leandro and 6 November 2023 Schaaf and Wheeler for TCD Design Exhibit A – Page 16 of 27 EXHIBIT A SCOPE OF SERVICES This contract provides for the design and preparation of construction bid documents for the installation of trash capture devices (TCD) recommended in the Full Trash Capture Feasibility Study dated June 2023. Six TCD sites are identified in this study and it is anticipated that all sites will be designed and bid at the same time. The requirements and conditions vary for each of the proposed TCD locations: two are in Caltrans right of way (ROW), four are on Alameda County Flood Control District (ACFCD) pipes or ROW, and two are on the East Bay Regional Park District (EBRPD) property. One is located near a pump station, and three are likely to be tidally influenced. At three locations, there may be the opportunity to install an outfall device. Phase 1 - Preliminary Design Task 1.1 Project Management and Meetings This task includes project management and meetings with City staff as needed to accomplish the preliminary design. Consultant to allow for a minimum of two (2) on-site progress and coordination meetings. Task 1.2 Data Collection and Research This task includes items related to collecting the necessary background data needed to start design work on the project, including the following: • Onsite field assessments and reviews of existing stormwater drainage and utility conditions at each proposed location. Review available construction drawings and other available information. • Investigation of existing site conditions, including existing utilities research and geotechnical desktop analysis and pre-field activities. Includes one day of field visits by the project engineer, geotechnical engineer, and the environmental permitting consultant. • Recommend brand and model for each TCD location that meets the 1-year event down to 5 mm particles permit requirement. Task 1.3 Hydraulic Evaluation and Analysis This task will review and analyze hydraulic impacts of the proposed trash capture devices on existing hydrology, including the following: • Determine 1-year, 1-hour and peak (15- and 100-year) flow rates using hydraulic models. Either existing models will be obtained from the ACFCD and modified to determine the 1-year flow rate, or Consultant will develop hydrologic models in HEC-HMS. • Determine localized hydraulic impacts based on the selected trash capture device. This scope does not include a model of the entire storm drain system but includes impacts for the area directly upstream of the device only. If a device requires a weir in the system for diversion, the weir height will be calculated to capture the 1-year 1-hour event considering device head loss. • Review of available ACFCD pump station hydraulic design criteria, existing equipment, and operating conditions. DocuSign Envelope ID: B1AAF39E-9A9A-4491-B2A9-FBDFD1CF7A5E