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Task 3.2-Turnout and Well Water Quality Data Review Carollo will review and evaluate the turnout and well water quality data provided by the City.The evaluation will include the following: • Review of historical and current monitoring plans and water quality data.Carollo will review the data and identify data gaps relating to monitoring parameters and sample locations. • Carollo will develop a monitoring plan outlining water quality parameters for sampling,locations,and frequency. • Once the revised monitoring plan in implemented by the City,Carollo will evaluate water quality data collected and recommend adjustments to the monitoring plan as needed to collect the necessary data. • Carollo will evaluate chloramine decay at each turnout and well.This analysis consist of collecting samples at each location and monitoring chloramine decay for up to 7 days.Key parameters known to influence chloramine decay such as pH,TOC,chlorine to nitrogen ratio,chlorine and ammonia residuals,temperature,and bromide will be monitored.The data collected can be used as a baseline for estimating water age and the onset of nitrification in the distribution system.Carollo will provide a detailed sampling protocol to be used by the City.The City will conduct the sampling and provide the data to Carollo for analysis. Based on the data collected in Task 3.2,Carollo will provide recommendations for improvements to water quality(i.e.,optimal pH,chlorine to nitrogen ratio,and chloramine residuals)at the turnouts and wells for reducing nitrification in the distribution system. Task 3.3-Residual Control and Mixing System Evaluation—Foothill Tank For the Foothill Tank location, it is assumed that an integrated residual control and tank mixing system will be the primary improvement recommended to improve water quality leaving the tank.Carollo shall evaluate current technologies available for residual control and mixing suited to the geometry and inlet/outlet configuration of the Foothill Tank.It should be noted that without developing a hydraulic model of the City's distribution system, it is not possible to estimate the potential impacts to water quality beyond the limits of the tank in the distribution system. The evaluation shall review various technologies that automatically monitor and boost chloramine residuals to operator defined set points.The evaluation shall include a capital cycle cost and pros/cons comparison that includes ease of implementation(i.e., permitting,construction, etc.),ease of operation,and effectiveness/reliability based on actual installations. Anticipated meetings associated with this task include: • Site Visits to view installed and operating systems included in the evaluation.The City has already visited the UGSI Monoclor system in the City of San Jose,so a site visit for that system is not required. • Carollo will provide a list of five recommended facilities for the City to tour.It is also assumed that Carollo will not attend the site tours with the City. • Workshop—Review results of evaluation with city staff to obtain input/direction,prior to issuing recommendation for pilot test equipment. The City will provide the following information: • Preliminary proposal from UGSI for a Monoclor Residual Control System Pilot Test Trailer,sited at the Foothill Tank.This information shall be incorporated into the evaluation. 4