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Home My WebLink AboutNC0050105_Influent Flow_20060411ROBERT W. SAUNDERS, COMMISSIONER VANCE B. NEAL, COMMISSIONER WILSON A. LACY, COMMISSIONER TERRI UNION, COMMISSIONER STEVEN K. BLANCHARD, GENERAL MANAGER PUBLIC WORKS COMMISSION OF THE CITY OF FAYETTEVILLE ELECTRIC & WATER UTILITIES April 11, 2006 Don Register Division of Water Quality, NCDENR 225 Green Street, Suite 714 Fayetteville, NC 28301-5043 Subject: Influent Flow Bypass Rockfish Creek WRF, PWC Permit No. NC0050105 Dear Mr. Register, 955 OLD WILMINGTON RD P.O. BOX 1089 FAYETTEVILLE, NORTH CAROLINA 28302-1089 TELEPHONE (AREA CODE 910) 483-1401 FAX (AREA CODE 910) 483-1429 This letter is a follow up to the conversations I have had with you concerning an accidental bypass of influent flow at the Rockfish Creek WRF during the night of April 8, 2006 and possibly into the morning hours of April 9, 2006. Operation personnel noticed the event on the morning of April 9t. I was not informed of the incident until my arrival at Rockfish Monday morning, April 10th at 8:00 am. Due to the ongoing construction project we are splitting influent flow mixed with RAS between both the "old" influent pump station and the "new" pump station. At the time of the bypass we were attempting to supply one basin (Basin # 5) by the old pump station and three basins (Basins 1,2,3) by the new pump station. It was our goal to supply Basin # 5 with approximately 3 mgd of flow. The screw pump that was supplying Basin # 5 will pull approximately 10 mgd if that much water is available to it. At the time of the bypass Basin # 5 was receiving between 6-8 mgd of flow. The amount of flow in itself didn't cause the bypass. The bypass was a result of restricting flow due to a gate in the influent channel of Basin # 5 being partially closed. This gate is just downstream of the parshall flume feeding Basin # 5. Due to this restriction the flow backed up in the channel until it began to over flow a temporary bulkhead installed by Seaside Utilities (Contractor). This problem was corrected by raising the gate just downstream of the parshall flume and also by throttling the flow available to the screw pump by lowering the channel gate that feeds flow to the screw pump. The flow that went over the temporary bulkhead was contained in an excavated area located between Aeration Basin # 3 and the "old" influent pump station. The flow consisted of a mix of RAS and influent. Two 2" submersible pumps were used to pump the contained water back into our system and lime was applied onto the areas in which the water had come into contact with. It is estimated that the volume of water bypassed was 15,000 gallons. The operation of two influent pumping stations has created a lot of challenges and the PWC regrets that this incident occurred. We feel the actions taken will prevent this type of event from happening again and hope the remedial action taken concerning the bypassed water is sufficient. cc: Mick Noland Dickie Vinent Sincerely, Public Yorks Commission Chuck Baxley, Supervisor Rockfish Creek WRF North Carolina's 4f Lar estMetro • AN EQUAL EMPLOYMENT OPPORTUNITY / AFFIRMATIVE ACTION EMPLOYER • search Page 1 of 2 Bypass/Upset Details 24 Hours Delete 24 Hour Details 5 lay Details 10 Day Details Questions Agencies Permit : NC0050105 Facility Name : Rockfish Creek WWTP Owner : PWC/Fayetteville City : Fayetteville 104/09/2006 *Bypass/Upset Start Date/Time: )02:35 am Incident Number : 200601111 County : Cumberland Region : Fayetteville *Est. Volume in gallons: J15000 Report Received: J04/10/2006 Report Entered: 104/11/2006 *Did Bypass/Upset reach Surface Water? Yes No _. Unknown Est. Volume: j *Fish Killed? Yes No 0 Unknown Est. Fish Killed? Other WaterBody: 5 Day Details *Bypass/Upset Start Date/Time: Duration: j *End Date/Time: *Est. Volume in gallons: j Report Received: Report Entered: 1 *Did Bypass/Upset reach Surface Water? Yes No Unknown Est. Volume: I *Fish Killed? Yes No Unknown Est. Fish Killed? Other WaterBody: ,j Regional Contact : ---Select Value --- County : ---Select *Location of of Units being Bypassed? Return activated sludge mixed with influent wastewater Req Comments: Date/Time (mm/dd/yyyy hh:mm am): City : Fayetteville Specific Cause (check all that Apply) Li Severe Natural Condition ❑ Vandalism ❑ Pump Station Equipment Failure ❑ Power outage . n Other (Please explain in Part II) ❑ For DWQ Use Only: http ://b ims. enr. state.nc.us : 7001/createBypas s. do 4/11/2006 search , Page 2 of 2 I? Construction ❑ Maintenance ❑ Upsets Finish Cancel http://bims.enr.state.nc.us:7001/createBypass.do 4/11/2006 DWQ / FRO FYI and Pass Along [ ] TO: [ ] Ken Averitte Staff Report Recommendations [ ] [Belinda Henson r/ Complaint Investigation [ ] [ ] Mike Lawyer _ Spill / ER Follow-up [ ] [ ] Dale Lopez _ / Please Complete by [ ] [Mark Brantley ✓ Please Investigate by [ ] [[bon Register t.- Last Person, Please File [ ] [ ] Chad Turlington — Return to [ ] [ ] Hughie White [ ] Trent Allen Return to Belinda S. Henson [?-1---