Agmt 2013 RMC Water and Environment

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Task 3–Flow Monitoring Flow monitoring is necessary to quantify dry and wet weather flows in the system and to calibrate the sewer system hydraulic model.A flow monitoring plan and site reconnaissance was conducted under a previous contract. This task involves the following activities: After the City's approval of the final flow-monitoring plan and traffic control plans, RMC(or their sub consultant)will install, calibrate and maintain the flow meters for up to 2 months during the rainy season and remove the flow meters at the end of this monitoring period. In addition, 3 recording rain gauges will also be installed to capture rainfall data during the flow monitoring period. RMC will review flow monitoring site reports to confirm final flow meter locations and will review the flow monitoring data every two to three weeks during the flow monitoring periods to check data quality and consistency. RMC will provide final electronic data files(15-minute data) at the conclusion of the monitoring. Task 3 Deliverables: • Flow monitoring data for each site including depth, velocity,flow rate, and rainfall in MS Excel format Task 3 Assumptions: • 21 area-velocity flow meters and 3 rain gauges will be installed for a period of up to two months during the 2012/13 wet weather season. • Flow meters will be installed during late January or early February 2013. • City will provide any required encroachment permit(s)for work in City streets. Task 3 Schedule: • Flow monitoring data shall be submitted by June 30, 2013. Task 4–Hydraulic Model Development Under this task, RMC will develop and calibrate a hydraulic model of the collection system. RMC will use its own software licenses for the modeling work; however, all model files developed and generated as part of the project will be provided to the City at project conclusion. RMC will use InfoWorks CS, a fully dynamic hydraulic modeling program from Innovyze,for this work. Subtask 4.1 Develop Model Network This subtask includes the following activities: • Develop and Validate Model Network. Using data from the City's GIS and asset inventory database, RMC will develop a hydraulic model of the sewer system. Available sewer record drawings and data from the City's previous Hydra model(as documented in the Appendix to the City's 1993 Master Plan report)and H2OMap SWMM model of the Transit Oriented Development (TOD)area(if available from the City)will be used to supplement the data in GIS and existing databases. The modeled sewer network will include, at a minimum, all sewers 10 inches and larger(i.e., the"trunk network") and critical smaller diameter pipes, including those that serve areas of significant size, are known or suspected by City staff to have capacity problems, or serve areas of potential future growth or redevelopment. Less critical smaller-diameter pipelines will not be included in the initial model but could be added in the future as needed. The model will also include any pump stations located within the trunk network. Following the construction of the model database, a QA/QC process called "model validation,"will be used to verify the data before Consulting Services Agreement between City of San Leandro and RMC Water and Environment—Exhibit A Page 3 of 9