More Backfilling and Compacting …

The open trenches are getting old.  Really old.

With the probability of rain tomorrow (Sunday) at 90%, we had Manny and Izzie focused on backfilling and compacting as much of the open trenches at the site as possible.

Finding a Large Inner Tube

We decided to cover the two concrete vaults for the inlet and outlet for our underground cistern with dirt.  However, in order to prevent the soil covering the concrete vaults from contaminating the water flowing into and out of the underground cistern, we needed a large, pliable gasket.  The perfect material?  A large inner tube.

Great idea.  Just try to find a large inner tube.

After looking on Craigs List and googling the San Jose area, and then making numerous phone calls, we found a shop with some inner tubes.  While we were prepared to buy a new inner tube, Gilroy Tire & Brake said they had a large tube that was being thrown out today.

Perfect. 

Bryan got in the truck and headed for Gilroy to pick up the inner tube.

Protecting the Geothermal Ground Loop

We have 48 loops in our 25 concrete piers.  Each of the loops are connected at the surface, and each of the 4 sets of 6 piers have supply and return lines that go into the West Mechanical room.  Several of the loops are close to the surface and will be within an inch of the bottom of the concrete walkways around the house.  The ground loops need to be protect. 

Ken Martin, from Silicon Valley Mechanical, prescribed how to protect the HDPE tubing and joints that are close to the surface.  We used the dense, closed cell packaging materials from our Fleetwood windows and sliding doors to protect the HDPE and attached the foam with nylon ties.

Example of HDPE connections at the top of a concrete pier.  If these connections are close to the bottom surface of the concrete walkway that will be poured then the HDPE must be protected with closed cell foam.

Example of HDPE connections at the top of a concrete pier. If these connections are close to the bottom surface of the concrete walkway that will be poured then the HDPE must be protected with closed cell foam.

Finding a used inner tube at Gilroy Tire & Brake (in Gilroy, CA).  Just what we need ...

Finding a used inner tube at Gilroy Tire & Brake (in Gilroy, CA). Just what we need ...

Underground concrete vault where the water collects before entering the underground cistern.

Underground concrete vault where the water collects before entering the underground cistern.

Outlet box, which needs to be covered and sealed.

Outlet box, which needs to be covered and sealed.

Cover on concrete vault ...

Cover on concrete vault ...

Nicely fitted inner tube to seal the underground concrete box and prevent soil from contaminating the overflow water leaving our underground cistern when it is full.

Nicely fitted inner tube to seal the underground concrete box and prevent soil from contaminating the overflow water leaving our underground cistern when it is full.

A couple inches of sand from GraniteRock ...

A couple inches of sand from GraniteRock ...

Backfilled with 8 inches of soil and then compacted.  Done!

Backfilled with 8 inches of soil and then compacted. Done!

HDPE covered with closed cell foam that is zip tied to the pipe.

HDPE covered with closed cell foam that is zip tied to the pipe.

Tube over the inlet concrete box ...

Tube over the inlet concrete box ...

Covered with sand from GraniteRock.

Covered with sand from GraniteRock.

And compacted.  Done.

And compacted. Done.

East side of house all backfilled and compacted.

East side of house all backfilled and compacted.

North side compacted and backfilled (just a bit left to complete).

North side compacted and backfilled (just a bit left to complete).

We need a second suction line from the pool that will allow us to move waste heat from the house into the swimming pool.  This second suction must be completed before this trench can be backfilled and compacted.

We need a second suction line from the pool that will allow us to move waste heat from the house into the swimming pool. This second suction must be completed before this trench can be backfilled and compacted.

West side of house backfilled and compacted.  This will make it much easier to install the three windows and the Eichler siding.

West side of house backfilled and compacted. This will make it much easier to install the three windows and the Eichler siding.

Leave a Reply

Your email address will not be published. Required fields are marked *