Sheetflow Construction Erosion and Sediment Control

October 30, 2019

Open Catch Basin Fixed Again

Filed under: Photo — Tags: , , , , , — Sheetflow @ 4:59 am
Back where we started, 30 mil PVC blocking the catch basin. Photo: David Jenkins

As of two days ago, there is new 30 mil PVC under the catch basin grate and turbid water is not draining into the catch basin. The contractor told their staff not to puncture the PVC. No word on whether they are thinking more proactively about this. The best measure is to keep the stockpile covered and the area cleaned up. We shall see what’s next.

October 29, 2019

Open Catch Basin Open Again

Filed under: Photo — Tags: , , , , , , — Sheetflow @ 4:55 am
Why, this was flooded yesterday, what happened? Photo: David Jenkins

The saga continues… the next inspection looked like the first inspection. 500 + NTU water draining into the catch basin. What happened?

30 mil PVC punctured to let water drain. Photo: David Jenkins

As suspected, someone didn’t like the flooding, so they punctured the 30 mil PVC. I am wondering why the contractor erosion control lead is not finding this.

October 28, 2019

Open Catch Basin Fixed?

Filed under: Photo — Tags: , , , , , , — Sheetflow @ 4:55 am
Catch Basin Blocked with 30 mil PVC Photo: David Jenkins

I inspected the open catch basin the next day, and this is what the contractor had done to keep turbid water out. I have nothing against doing this, but, since this does keep water out, flooding ensues. Flooding is okay if the catch basin is in a low spot and no one needs to work in the area.

I told the contractor that they might want to look at the storm system and see if there is a point where they can install a concrete plug temporarily and use the system for conveying the turbid water to their treatment system.

October 27, 2019

Open Catch Basin

Filed under: Photo — Tags: , , , , — Sheetflow @ 6:56 pm

I found this open catch basin during a construction erosion inspection. The turbidity of the water draining into it from the stockpile measured at over 600 NTUs. Note that there is an insert in the catch basin; these do nothing to reduce turbidity. I notified the contractor who should have found this in their daily inspections, which I pointed out to them.

July 26, 2019

Down the Drain it Goes

Photo: David Jenkins

Then the sediment washing off of the uncovered stockpile drains into a catch basin which drains into a small salmon stream.

July 23, 2019

Lobster Protection in Portland, Maine

In Washington, it’s salmon protection.

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