Field Office Compliance - Assistance

Assistance ID - 62844
Osceola Water Works - 310338248
2320 WEST CLAY STREET Osceola, IA 50213
Clarke County

FO 5

Report
File Name File Type File Date Note
Comments
8/15/2013 From: Osceola Water Works [mailto:osceolawater2@windstream.net] Sent: Thursday, August 15, 2013 8:55 AM To: Gastineau, Janet [DNR] Subject: RE: question on need for permit Thanks. If we replace anything we will replace with like materials. JANET GASTINEAU
8/15/2013 From: Gastineau, Janet [DNR] Sent: Thursday, August 15, 2013 7:21 AM To: Osceola Water Works Subject: FW: question on need for permit I am not sure what a G value is, but it looks like it is going to be a bigger deal than originally thought. See the engineer’s response below. From: Veerabhadrappa, Taroon [DNR] Sent: Wednesday, August 14, 2013 5:08 PM To: Gastineau, Janet [DNR] Subject: RE: question on need for permit They cannot replace a flash mixer with 12’of pipe. They need have some type of mixer (even a static mixer) with the same G value. The mixer was originally designed to have a specific mixing energy. If they want to do something else, I would recommend they consult with their engineer. They need to get permit/approval if they put other type of mixer. JANET GASTINEAU
8/14/2013 From: Gastineau, Janet [DNR] Sent: Wednesday, August 14, 2013 4:26 PM To: Osceola Water Works Subject: FW: inquiry/observation Brandon, this is what I sent to Oskaloosa. The spreadsheet IRWA uses for water loss is also attached. I am working with engineering on the other question about the flash mixers. From: Gastineau, Janet [DNR] Sent: Tuesday, August 13, 2013 8:14 AM To: 'Chad Coon' Subject: RE: inquiry/observation I’m afraid it’s pretty general. Recommended Standards for Water Works says 8.10 CROSS-CONNECTIONS AND INTERCONNECTIONS 8.10.1 Cross-connections There shall be no connection between the distribution system and any pipes, pumps, hydrants, or tanks whereby unsafe water or other contaminating materials may be discharged or drawn into the system. Each water utility shall have a program conforming to state requirements to detect and eliminate cross connections. To prevent contamination of both the public supply and potable water vessels being filled, we recommend either an air gap or backflow prevention device where the hose connects to the hydrant and not leaving the hose connected when not in use. DNR regulation says 43.1(4) Cross-connection control. To prevent backflow or backsiphonage of contaminants into a public water supply, connection shall not be permitted between a public water supply and any other system which does not meet the monitoring and drinking water standards required by this chapter except as provided below in “a” or “b.” a. Piping and plumbing systems. Piping systems or plumbing equipment carrying nonpotable water, contaminated water, stagnant water, liquids, mixtures or waste mixtures shall not be connected to a public water supply unless properly equipped with an antisiphon device or backflow preventer acceptable to the department. b. Bulk water loading stations. Positive separation shall be provided through the use of an air gap separation or a backflow preventer, which is acceptable to the department, at all loading stations for bulk transport tanks. (1) Minimum air gap. The minimum required air gap shall be twice the diameter of the discharge pipe. (2) Backflow preventer criteria. An approved backflow preventer for this application shall be a reduced pressure backflow preventer or an antisiphon device which complies with the standards of the American Water Works Association and has been approved by the Foundation for Cross-Connection Control and Hydraulic Research, University of Southern California. When, in the opinion of the department, evidence clearly indicates the source of contamination within the system is the result of a cross-connection, the department may require a public water supply to conduct public notification, identify and eliminate the connection, and implement a systemwide cross-connection program. JANET GASTINEAU
8/14/2013 From: Gastineau, Janet [DNR] Sent: Wednesday, August 14, 2013 4:16 PM To: Veerabhadrappa, Taroon [DNR] Subject: question on need for permit Osceola has two treatment trains, more or less, each with a flash mixer where ferric is injected. One of them has not worked for a very long time and they would like to replace both sides with about a 12’ pipe and take out the flash mixers. Seems when the flash mixer quit working it would leave ferric in the pipe when the plant shut off and the pipe has become corroded. He feels like there is enough rapid mix in the pipe length even without it. Do they have to replace like with like in accordance with original design or is it OK to take out both flash mixers and replace with straight pipe without needing a construction permit? I wasn’t sure if this was a normal maintenance item since they were changing/removing a treatment unit. Thanks. JANET GASTINEAU
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