AgdaPkt 2003-05-12 - Laserfiche WebLink

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7.A -g-3 DRAFT URBAN WATER MANAGEMENT PLAN SFPUC's corrosion control studies. The City conducted two six -month rounds of initial sampling at consumer taps for lead and copper. The lead action level was exceeded in both rounds. The reports are dated December 1992 and May 1993. The City provides public education materials within the annual water quality report that is distributed to its customers. The City has performed some water quality parameter monitoring in the past. The City has an approved sampling plan for lead, copper, and water quality parameter monitoring on file with the Department of Health Services dated November 3, 1998. During two six -month rounds, ending July 31, 1999, the City conducted monitoring in conjunction with the SFPUC and the other public water systems that serve water from the SFPUC supply. The City is required to conduct two six -month rounds of lead and copper monitoring at consumer taps, two six -month rounds of water quality parameter monitoring at taps in the distribution system, and bi- weekly water quality parameter monitoring at points of entry to the distribution system. The water quality samples are to be analyzed for pH and Langelier Index. - The SFPUC use the data generated to determine optimal corrosion control treatment appropriate for the SFPUC transmission system. Should any suburban agency continue to exceed the lead action level after the implementation of regional treatment, the individual agency will have to install optimal corrosion control treatment on its own. 4.4 Flushing and Cross Connections The City has a proactive program to flush the distribution pipelines to remove deposits, encrustations, sediments, and other materials. This prevents water quality problems related to taste, odor, and turbidity, among others. The program includes the flushing of dead ends and using unidirectional flushing to optimize results. The City maintains a database recording the schedule and length of time for each flushing. City personnel use maps from the "block book" and valve cards to locate valves and perform proper valve exercising. During times of water shortage, the City may suspend flushing activities to conserve scarce water resources. The City also has a cross connection control program contracted out to the San Mateo County Environmental Health Department. They use trained certified Staff to test 100% of the backflow prevention devices annually. 4.5 Capital Improvement Program fine of the City's guiding principles regarding water service is to repair /replace /upgrade the water distribution infrastructure on a 50 -year cycle to ensure the system's long term integrity. The City Council appropriates $2 million a year via its Capital Improvement Program to accomplish this objective as illustrated in Table 4.1. 33