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Temporary Flow Monitoring Study(Santa Ana) December 2, 2024 Page 3 weeks ("monitoring period"). This initial monitoring period can be extended based on mutual consent and written agreement of additional work and price for Such additional work. 2) Data Collection and Equipment Maintenance. Field crews will return to each of the locations to perform site maintenance and site confirmations as necessary. ADS is an ISO 9001 certified company and has proprietary internal quality procedures for all fieldwork. This includes cleaning depth and velocity sensors, confirmations as needed,and checking an installation to make sure that the ring is secure in the pipe. The ADS data analyst will also review any remotely collected data on a regular basis throughout the monitoring period. 3) Demobilization. Field crews will continue data collections and confirmations (as necessary) until the end of the monitoring period. Once authorized,crews will immediately begin removing the flow monitors. Phase III—Data Editing and Reporting 1) Data Analysis. Upon completion of the monitoring period, a trained ADS Data Analyst will analyze and finalize the data and make it available within 10 working days of removal of all flow monitors. The data analyst will directly calculate flow using the continuity equation from recorded depth and average velocity data. Flow quantities as determined by the continuity equation will be plotted. The analyst will also utilize scatter plots (depths vs. velocity readings)both to verify monitor accuracy. 2) Data Delivery and Final Report. ADS will prepare a Final Report in .PDF format of the flow data in tabular, hydrograph, and scattergraph format. Flow data is electronic format will also be provided. NOTE:ADS's Flow monitors are capable of providing very accurate and precise(repeatable)flow data. However, under some complex hydraulic conditions such as frequent backwater,surcharging,the presence of sediment,slow, shallow or rapidly changing flows,pump station influence,and disturbances in the flow path leading to and from the associated manhole in which the flow monitor is placed,the accuracy of the data is diminished.It is important that the Client understands that ADS's temp flow monitoring equipment is some of the best available in capturing flow data in most hydraulic situations,but that accuracy may be compromised in locations where the above listed hydraulic conditions can sometimes be persistent. City Responsibilities: 1) Access to the site of work with sufficient area for placement of personnel and equipment, including all right-of-way and ramps,if required. 2) Assumes no permits will be required and City staff will assist with traffic controls.If required, City to pay direct for any permit related fees and contract directly with traffic control services at sites that require more than our standard low volume ADS traffic control(2-person crew,vehicle mounted light board, 18 cones,3 signs). 3) Assumes any required permit related advanced notifications of residents/businesses will be handled by client or City. 4) If sewer/storm line is dirty and full of debris,ensure that selected sites have been jet cleaned to minimize hydraulic deficiencies or select an alternate location. 5) Provide any known information concerning 1-12S gas presence,bypasses,overflows,base flows, critical surcharge areas,and maintenance habits. C ENVIRONMENTAL SERVICES`