Agmt 2013 RMC Water and Environment

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beginning any model runs. This process includes checking network connectivity and data completeness and reasonableness for apparent discrepancies(e.g., negative pipe slopes, outlet pipe invert elevations higher than inlet invert elevations etc.). Missing or suspect data will be resolved to the extent possible through review of available record drawings or field verification. The source of all new or updated data in the model will be documented directly in the model database using InfoWorks"flags"and notes. • Delineate Subbasins and Populate Model. RMC will review and refine(further subdivide)the previous model subcatchment(subbasin) boundaries and assign the model loads and flow factors developed as part of Subtask 4.2 to the subcatchments. Subtask 4.2 Develop Model Loads and Preliminary Flow Factors This subtask includes the following activities: • Estimates of Existing Wastewater Flows. RMC will review existing parcel, customer billing and water use data, land use type, number and type of dwelling units, etc. that are collected under Task 2 to determine the best approach for using this data to estimate existing base wastewater flows. The exact methodology to be used to develop model loadings will depend on the format and completeness of available parcel-based data; however, it is anticipated that EBMUD water use records will be the primary source of data for developing model loads. If sufficient data is not available to generate loadings on a parcel basis, then 2010 census data at the block level may be used for this purpose. Commercial, industrial, and/or institutional users which may contribute significantly greater unit flows than average shall be identified and investigated individually through discussions with City staff. • Estimates of Future Wastewater Flows. RMC will review the City's General Plan,TOD Strategy gY and 2010 downtown/BART TOD infrastructure study, and other relevant planning documents, and Y p g will coordinate with the City Planning Department staff to discuss specific planning issues and potential growth or redevelopment areas in the City. Using this information, estimates of future wastewater flows based on the type,density, and location of projected future development and redevelopment areas will be developed for a 30-year planning horizon as specified by the City. To the extent that the information is available,these estimates will be compiled at the parcel level to maximize the accuracy of the data. The projected timing of any growth/redevelopment will also be discussed to provide input on potential phasing of collection system improvement projects identified as part of the Master Plan. • Preliminary Design Flow Criteria. RMC will develop the design criteria to be used to estimate wastewater flows, including unit base wastewater flow factors for residential and non-residential land uses; diurnal base wastewater flow patterns; and infiltration/inflow parameters. These criteria will be developed based on the flow monitoring data from Task 3 plus RMC's experience with similar Bay Area systems. These criteria will be verified/refined through the model calibration process under Subtask 4.3. Subtask 4.3 Calibrate Model • Calibrate Model. RMC will run the model under existing conditions and compare the computed dry weather and wet weather flow hydrographs to observed flow monitoring data and pump station and treatment plant SCADA data. Modeling parameters such as unit flow rates, diurnal curves, and Ill factors will be adjusted as needed to achieve a reasonable match for modeled to metered flows. Consulting Services Agreement between City of San Leandro and RMC Water and Environment—Exhibit A Page 4 of 9