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Burien Landslide

This landslide consisted of a hill owned by 3 homeowners and was sliding into a 4th homeowner's property.  The drainage line for these homes emptied into a hill which was not stable enough to keep up with the water flow.  The hill was excavated back, we connected the drainage pipes to the existing storm system and then reinfored the hill.  After all site work was complete, the access driveway was replaced and all landscaping was replaced.

 

 
Project Photos

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Caption: This is the landslide before Cascade Utilities, Inc. was called to save the day!
 

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Caption: As you can see there is a large sink hole at the top and the hillside is sliding down to the neighbors property below.
 

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Caption: It was obvious from the start that this was something that had been going on for a long time and the homeowners had done as much as they could to defer the slide.
 

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Caption: We begin by excavating and removing the soil that had been on the move!
 

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Caption: As the soil is removed, it is placed into awaiting dump trucks to be hauled away to an off-site dump site.
 

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Caption: There is one excavator working the bottom of the slide and a 2nd that it working on stabilizing the ground above.
 

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Caption: The two excavators continue to remove the unstable soil and load into dump trucks.
 

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Caption: Excavation continues! It's necessary to remove all unstable soil before any drainage work is done. This is a huge portion of the work for these types of projects.
 

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Caption: Excavation continues until there is stable soil found.
 

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Caption: Once excavation is complete, we placed a filter fabric on the ground before the pipe is installed.
 

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Caption: After the filter fabric is secure, the drainage pipes are installed and connected to the existing drainage system.
 

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Caption: As you can see, we have excavated the soil in a stair like fashion. The pipes are being installed and connected. After one stair has all the pipe connected, it's covered in pea gravel.
 

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Caption: Here we are connecting the newly installed pipes into the existing storm system at the bottom of the hill.
 

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Caption: More pea gravel is placed on each stair and the pipes continue to be connected together.
 

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Caption: Compacting the material below.
 

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Caption: The pea gravel is carefuly spread over each stair and pipe that was installed. This helps the water drain right down into the pipes we just put in.
 

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Caption: We have several highly skilled laborers and foremen, many of which have been with this company for 10-20 years! If we can't get a machine in to do all the work, we have a laborer that can!
 

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Caption: The excavator keeps on compacting the earth below.
 

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Caption: We're getting closer and closer to the finished product!
 

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Caption: Just a second view to get a good idea of just how much soil was removed!
 

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Caption: The lower stair is complete and now both excavators work on comapcting the soil on the upper stair.
 

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Caption: After the pea gravel has been placed and compacted, a thick layer of topsoil is placed over the area and compacted as well.
 

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Caption: At this point we call in one of our subcontractors who is spraying the hill with grass seed which will help stabilize the hill in the future.
 

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Caption: See the concrete structures at the top of the hill? Those are going to collect water carry it to the storm system at the bottom.
 

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Caption: After the grass seed is on the hill a layer of straw is palced above it. This helps the grass grow and also assists in soil stabilization.
 

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Caption: A layer of topsoil is placed at the top of the hill the bring the backyard together with the new landscaping.
 

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Caption: The straw that is placed on this hill is held together in a filter fabric and staked to the hill to prevent it from sliding too!
 

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Caption: There are many variations on the way you can end a hillslide restoration like this. A nice rock retaining wall at the bottom will assist in stabilization of the hill as well as bring the entire project together.
 

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Caption: The straw is staked directly to the top of the hill as well as the bottom.
 

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Caption: One more section to go!
 

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Caption: Just about a finished project!
 

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Caption: You can barely see the tops of the concrete drainage structures, but they are certainly there and ready to get to work!
 

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Caption: After the hillside is complete, we now begin restoring the backyard of our homeowner.
 

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Caption: Everything is graded out and ready for new lawn to be placed.
 

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Caption: Final grade of backyard.
 

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Caption: New landscaping as well as a look at the top section of the hill which is just small concrete blocks. You can also use stamped concrete for more of a designer look.
 

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Caption: And our completed product! Even with some green grass starting to grow!
 

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Caption: The driveway is replaced since most driveways aren't cut out for heavy machinery and dump trucks to use it for any length of time.
 

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Caption: There view was widened after we left there too! And what a view it is!