06 - Laserfiche WebLink

each workshop as necessary.The data request and review will provide Carollo with key information regarding the chlorine to nitrogen ratio leaving Zone 7's water treatment plants and entering the City's system. Task 2.0-Deliverables 1. Kickoff Meeting agenda and minutes. 2. Meeting agendas and meeting notes from the coordination meetings with Zone 7. Task 2.0-Assumptions 1. Three(3)meetings will be conducted at the City's or Zone 7's office during the course of the Project under this task. 2. Development of the meeting agendas will likely be an intra-agency collaboration with input from Carollo. 3. Zone 7 will provide the water quality data requested by Carollo within two weeks. Task 3.0- Nitrification Evaluation and Report In addition to the testing required by the California State Water Resources Control Board,the City has historically tested for nitrification once a week at six locations(referred to as special samples).The City's lab also has an informal practice to perform nitrification tests at a sample location when that routine sample shows abnormally low chlorine residuals.Historical testing has not regularly included monochloramine,total ammonia,or free ammonia.As of October 2018,the City has implemented a new nitrification sampling plan to support these project efforts and this information has been provided to Carollo. Task 3.1-Distribution System Water Quality Data Review Carollo will review and evaluate the distribution system water quality data provided by the City.The City will also provide maps showing key items such as pressure zones, booster stations,storage reservoirs,existing sample sites,existing flushing sites,and customer complaints. The evaluation will include the following: • Review of historical and current distribution system monitoring plans and water quality data.Carollo will review the data and identify data gaps relating to monitoring parameters and sample locations. Expected parameters for analysis at each site include pH,temperature, monochloramine,total chlorine,free ammonia,and nitrite.The sample locations and frequency will be determined as part of this task.Sample frequency will not be more frequently than weekly. • 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. Based on the data collected in Task 3.1, Carollo will highlight problem areas for nitrification and provide recommendations for a nitrification response.It should be noted that without developing a hydraulic model of the City's distribution system, it is difficult to determine methods to reduce water age in the distribution system. 3