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Old 04-25-2017, 03:04 PM
HSEGirl HSEGirl is offline
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Question Shop Floor Sump Pits

Hello all,

I work in a manufacturing facility where the building is not owned by us. We recently had a random city inspection, where the city came over to inspect the integrity of our sump pits located in the shop floor.

We were using the pits to store hazardous waste water after our shop floor has been washed. Until we can isolate or improve our galvanization process, We know the zinc content in the waste water is too high to release to the sanitary or storm sewer systems.

Cracks were noticed in the sump pits upon inspection but no order was given to install sump liners or repair the cracks. We were given advice to install an "interceptor" in the overflow compartment so that any oils etc. sitting on the top of the waste would not accidently flow into the sewer systems which are connected way down the line to the sumps. This we did.

When we advised the building owner of the cracks, they insisted on filling all of the sump pits with water. Other than a static leak test, does anyone know or understand what their intention would be to leave the pits filled with water indefinitely? I understand filling them to watch or wait for leakage or evaporation, but do not understand why they would fill them, leave them that way, and refill after leakage or evaporation is noticed. Is there a reason for this other than perhaps they do not want us to use them at all? Doe filling them not make them inoperable for their intended purpose? Please help!

Last edited by HSEGirl; 04-25-2017 at 03:05 PM. Reason: spelling error
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Old 04-25-2017, 03:51 PM
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weldor2005 weldor2005 is offline
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If there isn't adequate air flow, filling them could prevent toxic or other gases that come in from ground building up.

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Old 04-25-2017, 07:23 PM
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digger doug digger doug is offline
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It's Canada...they don't have any OSHA...eh ?

Sounds like they want a "Grease trap" on the drain outlet.

Even though the problem is the zinc content, not grease/oil,
and they want it downstream of the sump, meaning they don't want
it stored there.

The zinc content problem would have to be solved even further downstream,
sounds like plumbing changes would be needed.
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Old 04-25-2017, 09:31 PM
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Ironman Ironman is offline
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In the Mines acts and Workers Comp regs there is a lot of stuff about pits. They really dislike them as so many people have died in pits from CO poisoning.
They require a forced ventilation system and a CO monitor before allowing any workers into them.
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Old 04-26-2017, 06:12 AM
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digger doug digger doug is offline
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Quote:
Originally Posted by Ironman View Post
In the Mines acts and Workers Comp regs there is a lot of stuff about pits. They really dislike them as so many people have died in pits from CO poisoning.
They require a forced ventilation system and a CO monitor before allowing any workers into them.
But it sounds as this case involves leaking zinc contaminated water, not fumes
and confined space rules (of which OSHA has very tough rules here in the states)
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Old 04-26-2017, 03:23 PM
kbs2244 kbs2244 is offline
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This a guess, but they may wanting the water to act as a "cap" to cover the heavier waste.
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Old 04-27-2017, 09:34 AM
HSEGirl HSEGirl is offline
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If the holding water is in there, we cannot use them at all as there is no room left inside to put our waste water from the floor washing machine. Maybe this is their intention, maybe they do not want us to use them as I can see no other practical reason. We did install grease traps on the outlet but this was not an issue for us to begin with. They are also not aware of the lab results which told us the zinc in the wastewater cannot be released into the sanitary sewer. Knowing this, we just hold the waste in the sump and then have them vacuumed out for proper waste disposal. We will now have to buy an above ground storage tank or similar for this purpose.
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Old 04-27-2017, 11:09 AM
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The water based parts washers (the machines) are adding heaters to boil off the water at night/weekends so the disposal is much less material, just the sludge.

Your holding tank you need to purchase might be able to incorporate
such a heater.
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