Sheetflow Construction Erosion and Sediment Control

November 12, 2019

Hydroseeding on Blanket Instead of Under Not the Best

Filed under: Video — Tags: , , , , , , , , — Sheetflow @ 7:18 am

This is not the best way to get grass growing. The seed sits on the blanket which is a quarter to half inch above the soil. Since the seed needs to be in contact with the soil to have the best chance of growing, this will reduce the quantity of grass that grows. In a ditch, the more grass the better. The best way is to hydroseed first and then install the blanket.

November 5, 2019

Inspecting Sand Bag Check Dams

How to inspect sand bag check dams.

October 22, 2019

You Don’t Always Need to use Silt Fence

October 21, 2019

“Means and Methods” vs. Best Management Practices

Demolition of landside crane rail on a shipping container terminal.

In my experience, managing contractor “means and methods” is more important than using the “right” best management practices. When turbidity is the standard for measuring water quality compliance, as in Washington state, site cleanliness is the key to prevention and compliance.

This contract requires that catch basin inserts be installed in all catch basins within the project boundaries. However, inserts are not at all effective in reducing turbidity in runoff. While removing the crane rail on this container terminal project, the contractor could clean up as the work progresses, place all material removed from the trench onto plastic for later removal, load into a Bobcat bucket, and pick up small debris with a shop vac. I can require these things in the contract that the contractor bids. It may cost extra; the extra cost may be worth it if it reduces my risk. If I tell the contractor after the contract is awarded, I will pay more.

I can also make suggestions during the work, pointing out that keeping things really clean will keep them in compliance with their NPDES permit. If framed in a way that shows benefit to the contractor, meaning reducing risk and cost, they will probably follow the suggestion.

October 12, 2019

Sand Bag Berm to Divert Clean Water View 3

October 8, 2019

Sand Bag Berm to Divert Clean Water View 1

October 6, 2019

Construction Entrance Fail

This is a 30 + acre site with one access point, this one. If this was my project, I would have specified a tire wash with an asphalt exit to the street. The tire wash would have been long enough for two tire rotations, have high pressure, low volume nozzles located such that all tire surfaces were sprayed. This system would also have an on-board, treatment polymer injection system to keep the tire wash water relatively clean. I would have specified that the water be tested for turbidity daily, measured at 50 NTUs or less. Since the water is classified as “process water”, I would have required it to be tested for metals and other contaminants, then hauled to an appropriate disposal facility.
Photo: David Jenkins

October 2, 2019

Secondary Containment Fail

Filed under: Photo — Tags: , , , , — Sheetflow @ 5:29 pm
Photo: David Jenkins

September 24, 2019

That’s Some Fancy Rock Construction Entrance

I saw this on the way to work and thought it was amusing on the surface. Really, though, I think they needed the elevation to access the upper part of the site.

September 3, 2019

Temporary Irrigation for Erosion Control Grass Growth Success

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