2006 Water Comprehensive Plan - City of Bellevue

SUMMARY OF MONITORING REQUIREMENTSTable 10-8 summarizes water quality monitoring requirements applicable to Bellevue. The tableincludes parameters to be monitored, sampling location and frequency.LeadCopperAsbestosTable 10-8Summary of Distribution System Monitoring RequirementsParameterRegulatoryRequirementLocationFrequencyVaries. During 2005, tworounds of LCR monitoringwere conducted at the tap. Ifeligible for reducedLead and Copper Rule Customer taps monitoring, this will occuronce per year until system iseligible for a furthermonitoring reduction of oncePhase II RuleOne site indistribution systemTotal Coliform Total Coliform Rule Throughoutdistribution systemevery three years.Once every nine years. Nextmonitoring occurs in 2010.84 samples per monthChlorine Residual SWTR Throughoutdistribution systemTTHM 1Stage 2 DBPHAA5 1Throughoutdistribution system84 samples per monthIDSE plan in 2006IDSE report in 2008Quarterly monitoring forMCL compliance beginningin 2012.1 The Stage 1 D/DBP Rule replaced the TTHM Rule in 2002, but as a consecutive system, Bellevue was not required tocomply. Bellevue is required to comply with requirements of the Stage 2 DBP Rule.RECOMMENDATIONSWith regard to proposed regulations, Bellevue will be most impacted by the Stage 2 DBP Rule.Bellevue has begun planning their IDSE approach, ensuring adequate time to develop and submittheir IDSE sampling plan by the deadline established by the final rule. Additionally, Bellevueshould continue voluntary monitoring for DBPs in their system to ease preparations forcompliance with the MCLs included in the Stage 2 DBP Rule.Bellevue should continue to closely follow developments associated with revisions to the TotalColiform Rule and with development of the potential Distribution System Rule.During the next six years, it is likely that Cascade will begin supplying Bellevue with water fromthe Green River. This supply source will be an unfiltered, ozonated drinking water supply,10-17