Contact Report Details | Data Online | Oregon Drinking Water Services

More information for this water system: SDWIS ID 4303
System Info :: Report for Lenders :: Alerts :: Violations :: Compliance & Enforcement :: Contacts & Advisories :: Site Visits :: Public Notice
Coliform Summary :: Coliform Results :: Coliform Schedules :: LT2 :: GW/GWUDI Source Details :: Plan Review :: Annual Fee
Chemical Summary :: Chemical Results :: Chemical Schedules :: Chemical Schedule Summary :: Arsenic RAA :: Cyanotoxins :: PFAS
Lead & Copper :: DBP Sample Sites :: FANLs :: MRDL :: GWR 4-Log :: Turbidity :: SWTR :: LRAA :: DW Source Protection

OHA Drinking Water Services Contact Report Details
PWS ID:	OR41 00799
PWS Name:	SEASIDE WATER DEPARTMENT

Who Was Contacted and Phone:	Ben Davis (503) 738-5112
Contact Date:	11/25/2009
Contacted By:	HOFELD, EVAN (REGION 1)
Contact Method/Location:	Office

Assistance Type:	OTHER REGULATORY - REGULATORY ASSISTANCE
Reasons:	SWTR None

Details:	SUMMARY: CT and regulatory assistance DETAILS: Ben had thought that they did not meet CT on 11/19 and 11/23, however, they had been using contact time estimates from the manufacturer and derived from a 2008 water system survey. The survey estimated a clearwell baffling factor of 50% due to the configuration and a contact time of 48 minutes at 2,800 gpm. The survey also indicated that a tracer study was required. Tracer studies conducted after the survey at 2,400 gpm and 2,800 gpm demonstrated contact times of 115 and 94 minutes, respectively. Factoring these contact times into the CT calculation revealed that CT was met on 11/19 and 11/23. ACTION NEEDED: System to begin using contact time derived from the tracer studies. No treatment techniques were violated.