Backflow Preventer Questions

Discussion in 'Irrigation' started by Darryl G, Nov 21, 2012.

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  1. cjohn2000

    cjohn2000 LawnSite Senior Member
    Posts: 553

    Midwest?:confused:
     
  2. cjohn2000

    cjohn2000 LawnSite Senior Member
    Posts: 553

    All I see is in ground dblchks, I think I remember my old boss saying that PVBs are not allowed.
     
  3. irritation

    irritation LawnSite Gold Member
    Posts: 3,188

    DCVA's are not allowed here for irrigation.
     
  4. cjohn2000

    cjohn2000 LawnSite Senior Member
    Posts: 553

    I live in the land where RPZ are allowed in a box set below grade as long as there is a drain to air. I remember the worst system I worked on was on an apartment complex and it ran off of hosebibs with an ASV for each hose bib and it was all 1/2" sch. 40
     
  5. cppendergrast

    cppendergrast LawnSite Member
    Posts: 107

    I have dealt with irrigation well systems that were located next to malfunctioning sewer pump stations and seen results of the legal aspects of serving people fecal matter. It doesn't matter if it is animal or human. It will make people sick. The best thing you could do is refer them to a qualified person to identify the source.

    In most places, a reduced pressure backflow assembly is not required on a well. An RP would be used to protect a city supply or a well from a potential high hazard source, ie. chemicals, etc. going backwards. It would appear that your source is already contaminated.

    The contamination could be coming from the well. Yes, the annular seal on the well may have failed and the animal feces may be going underground. There can be any number of possibilities but unless you are trained in this, I'd leave it alone.

    Again, let an accredited person or company find the source and recommend a fix. Any mis-diagnosis could lead to lawsuits. Google water well contamination and legal actions.
     
  6. irritation

    irritation LawnSite Gold Member
    Posts: 3,188

    RP's must be 12" above grade when installed outside. They must have a suitable drain for the relief valve if they are installed inside a building.
     
  7. cjohn2000

    cjohn2000 LawnSite Senior Member
    Posts: 553

    Not in my area
     
  8. Darryl G

    Darryl G LawnSite Fanatic
    Posts: 8,033

    Sorry...I'm in Connecticut USA. I've always had my location listed here...guess it must have gotten deleted when the mods edited my signature line or something. It does freeze here. I know very little about irrigation systems other than how to shear off the heads when mowing, lol. I do know a fair amount about wells and groundwater contamination though, which is why I was volunteered for this problem.

    So the bottom line is that a poorly designed or malfunctioning irrigation/water supply system very well could be causing backflow into the well...right?
     
  9. irritation

    irritation LawnSite Gold Member
    Posts: 3,188

    And it could be from the irrigation system. I have blown out and turned on systems that smell like fecal matter. It should be considered high hazard.
     
  10. Mike Leary

    Mike Leary LawnSite Fanatic
    Posts: 21,755

    Yes, and exactly why I installed DCVAs in every irrigation system fed by a well . It's not necessarily the design of the system, it's the possibility of fertilizers, pesticides, dog ****, etc., getting sucked back into the aquifer. :hammerhead:
     
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