R2019-192 Resolution Approving an Agreement with CDM Smith for Professional Engineering Services for the Water Utility Long-Term Sustainability Plan, City Project 2018-34

Home Browse Search

Smith • Conducting hydraulic model simulations for average day flow, maximum day flows, peak hourly flows, and provide results with GIS maps with contours for the following(up to five model scenarios are included in the fee development): o Residual pressure o Available fire flows o Water age • Identify any deficiencies in the distribution system related to pressures,fire flows,water age at the different water demand scenarios based upon the established level of service. � Identify operational improvements for system optimization and energy efficiency, such as pump operation. • Simulate system improvements in the model to correct the deficiencies identified above. For this Task,CDM Smith assumes that the model is complete and calibrated and ready for use. In addition, it is assumed that water demands,and pump operational scenarios are included in the model. CDM Smith's efforts are limited to model simulations based on the established modeling scenarios.The hours noted in Exhibit A.1 for this Task reflect the assumed level of effort. If additional modeling effort is required, an amendment to this Contract will be required. Task 6-3: Distribution System Storage Analysis CDM Smith will evaluate the distribution system water storage needs based upon: • Emergency storage • Fire flow storage • Operational storage to address diurnal flow changes The storage evaluation will be included in Task 6-7 below. If additional storage is recommended, CDM Smith will provide information on the optimum location for the additional storage,volume, and type of storage(elevated,ground,etc.). Review the need for the proposed SWTP Reservoir. Based on the tank inspection reports and flow data provided by the Utility, CDM Smith can identify if potential water loss exists at the existing ground storage facilities. Task 6-4: Develop a Watermain Rehabilitation and Replacement Program In order to prioritize capital investment,CDM Smith will develop a watermain rehabilitation and replacement program as described below. • Utilize the existing GIS data with Utility piping and develop database with pipe information including diameter, length, age, material type, history of main breaks, soil conditions, and other critical condition information. • Use the hydraulic model to conduct a criticality analysis(critical customers served by pipe,flow, velocity, etc.) • Use the GIS database to conduct water main risk analysis/prioritization based on condition and criticality information to prioritize water main replacement and identify pipes needing rehab or replacement. • Develop a list of water mains to be rehabbed or replacement for 5, 10, 20, and 30 years. • Review rehabilitation and replacement technology. 7 � Page