Sheetflow Erosion & Sediment Control Heavy Civil Construction

June 24, 2020

Silt Fence and Trackout Fail Part 2

This is a follow up to Silt Fence and Trackout Fail post from April 6, 2020. Same old !@#$, different month.

Photo: David Jenkins
Photo: David Jenkins

June 18, 2020

Rock Construction Entrance

Photo: David Jenkins
Photo: David Jenkins

Rock construction entrance to the Groco stockpile. It is properly installed over geotextile fabric and is 100 feet long. Even so, there is obviously material on the tires the full length, onto a gravel section then onto concrete road surface, then another 250 feet. Nothing got onto the public road and all was swept up.

Still, the best way to deal with trackout is to find ways to keep tires clean. If the delivery trucks had stayed on the rock to dump, and if the loader had moved the compost from where the truck dumped, there would be no trackout.

May 28, 2020

Prevented Trackout

Photo: David Jenkins

Grizzlies were placed from the road back into the site where gravel borrow fill and rip rap were needed. The delivery trucks were singles, no trailers, and backed up to the steel plate near the excavator and dumped. The excavator moved the material into the proper piles. The truck tires came in clean from the paved road, stayed clean on the grizzlies and left clean. No need for a tire wash, just some thought and planning.

May 27, 2020

Preventable Trackout

Photo: David Jenkins

Asphalt was removed to work on the new building foundation. Driveway asphalt was left in place, which is good. Gravel base course was delivered to be placed under the concrete slab. Instead of backing all of the way into the site, over wet dirt, they could have stayed on the asphalt driveway to unload and used site equipment to move the gravel. It is possible that the gravel came in trucks with trailers in which case backing all of the way in was probably necessary to avoid blocking traffic on a fairly busy street. With some added cost, single dump trucks could be used as described above and prevented the track out. While this is not a lot of dirt on the road, it does add up and is a magnet for inspectors and regulators to visit the site. The contractor could also have dumped gravel next to the asphalt, then graded it back into the site to provide a construction access into the site. In this way, the delivery truck, even with trailer, could have stayed on gravel rather than driving on dirt.

February 26, 2020

Construction Entrance Fail

Construction Entrance Fail Photo: IG:freudianswppps

Another construction entrance fail. Vehicles drive through the Soaker tire wash, over some rock, then over dirt and sand, defeating the purpose of the tire wash. This exit from the tire wash needs to be rock or asphalt to the street. Disclaimer: I do not promote any products or suppliers.

February 25, 2020

Construction Erosion Inspection-Turbid Discharge

6000 NTUs Photo: David Jenkins

A little bit of sediment track out each day builds up. The contractor was vacuum sweeping this area on a regular basis but the first rain shows how effective that was. I measured this discharge at 6000 nephelometric turbidity units (NTUs) using an old Hach 2100P turbidimeter. This meter only reads up to 1000 NTUs, so I had to dilute the sample 3 times to determine the actual reading.

February 21, 2020

Sediment Track out-I’ve had Enough

Another day, another random drive by construction erosion inspection. This is an ongoing issue and remains unresolved.  I issued a Non-Conformance Report stating that the construction entrance/exit will remain closed permanently unless a solution is found and implemented.

February 20, 2020

Just a Little Trackout

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 1, 2019

Yet Another Truck On Asphalt

Filed under: Video — Tags: , , , , , — Sheetflow @ 3:09 am

Prevention is the cheapest way to keep tires clean.

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