OHA Drinking Water Services
OHA Drinking Water Services
Contact Report Details
PWS ID: OR41 00041
PWS Name: AMITY, CITY OF
 
Who Was Contacted and Phone: Matt Johnson (971) 237-0971
Contact Date: 12/29/2010
Contacted By: SALIS, KARI (DWP)
Contact Method/Location: Office
 
Assistance Type: OTHER REGULATORY - REGULATORY ASSISTANCE
Reasons: Operations
SWTR
 
Details: SUMMARY: backwash water flowing into clearwell DETAILS: Matt called to inform us that he just discovered a problem at his plant. He heard water trickling into the clearwell when he knew the plant to be off. After investigating, he found that the overflow line from the clearwell went into a manhole. There is a flap valve on the end, but it was broken open. A line from a ditch and backwash pond also flow into this manhole. The manhole was filled with water, submerging the overflow line from the clearwell. Elevations are such that the backwash water can flow into the clearwell by gravity when the manhole is full. Matt estimated the flow to be less than 10 gpm. He believes that the plant was designed this way, but he was not aware of the clearwell overflow line, so has not been inspecting the flap valve or water level in the manhole. He believes this may have been happening frequently in the rainy season. He was going to install a compression-plug in the overflow line today, and plan to make a physical separation once they can get to the pipe (it is about 8ft below grade). For now, he is pumping out the manhole and will make sure it does not submerge the OF line. His chlorine residual leaving the clearwell is 1 ppm, which is normal, but he will check residuals downstream and also take at least one extra coliform sample. Chris H and I agreed that no boil advisory or public notice is necessary, since nothing has been detected in testing over time, and we do not know how long this has been happening. ACTION NEEDED: physical separation of lines once able.

More information for this water system: SDWIS ID 4688
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