OHA Drinking Water Services
OHA Drinking Water Services
Contact Report Details

PWS ID: OR41 00461
PWS Name: RIVERGROVE WATER DISTRICT
 
Who Was Contacted and Phone: DJ Ezell (503) 635-6041
Contact Date: 10/18/2012
Contacted By: FARRELLY, PETER (DWP)
Contact Method/Location: Office
 
Assistance Type: WATER QUALITY ALERT RESPONSE
Reasons: Coliform
N/A
 
Details: SUMMARY: TC-positives in lower distribution system still DETAILS: September
Several clean Special sample results helped resolve Septembers TC+s. Triggered samples were absent. Rivergroves flushing treatment appeared to successfully remove the contamination.

October
However, now Octobers five or more TC+ results befuddles us all. Special samples were taken at all three reservoirs. Res. #3 feeds the lower system, while Res. #1 & #2 feed the upper distribution system. Res. #3 came up TC+ Friday, Oct. 19th.

This is all during the final months of transition before finally unifying the bifurcated distribution system. ACTION NEEDED: Tentative action plan:

* Flush lower system aggressively in TC+ areas (central area).
* Schedule Reservoir cleanings for November 8th.
* Chlorination of both upper and lower distribution systems occurs 15 December 2012.
(I suggested elevating chlorine to 2 or 3 ppm breifly at night in order to pseudo-shock the distribution systems, then flush water around 3 am to the lower, less perceptible chlorine level of 0.3 ppm.)
* Verify approach next week on the phone.

 
Associated Alerts: COLI11059 - 10/17/2012 - COLIFORM, TOTAL (TCR)

COLI11059 - 10/17/2012 - COLIFORM, TOTAL (TCR)



For further information on this public water system, click on the area of interest below:
System Info :: Report for Lenders :: Alerts :: Violations :: Compliance & Enforcement :: Contacts & Advisories :: Site Visits :: Public Notice
Coliform Summary :: Coliform Results :: Sampling Schedule for Coliform :: Groundwater/GWUDI Source Details :: Plan Review :: Annual Fee
Chemical Group Summary :: Latest Chemical Results :: Entry Point Detects :: Single Analyte Results 
Chemical Schedule Summary :: Chemical Schedule Details
Lead & Copper :: Corrosion Control (LCR) :: Nitrate :: Arsenic :: Radionuclides :: GWR 4-Log :: LT2 :: Cyanotoxins
DBPs :: TOC & Alkalinity :: DBP Sample Sites :: FANLs :: MRDL :: Turbidity :: SWTR :: RAA :: LRAA For SDWIS: 3348