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Installing the Septic System | Blossom Valley Accessory Dwelling Unit

Blossom Valley ADU Septic System

It’s Bill Freeman with Freeman’s construction. I’m here on a job in El Cajon and we are installing the septic system. This system is a little bit different than the conventional system, because our leach field is actually at an elevation that is higher than the building pad here. There’s a lot of these lots where we put these ADUs, we have to be creative in the way we get our septic systems done. So this particular system, as you can see, there’s two tanks right here.

Conventional Septic System vs. Pump Tank

The first tank that you’re seeing is the normal septic tank that we install, where there’s a two-compartment tank, and then everything goes into that tank. Then the effluent that would normally run out into the leach lines will come out the end of thetank and dump into leach lines. However, now what we have is a pump tank. This catches the effluent, and then there’s a pump that goes in that tank. Then as you can see this trench going up the hill, we’ll take a line going up there and it’ll run up to what’s called a surge tank that’s up above where the leach lines are going in. It then:

  1. Gravity-feeds out that tank up by each lines.
  2. Flows into each lines.
  3. Performs exactly same way it would if you were just flowing right out of the septic tank.

So just another way that we’re able to put these systems in and be able to make them work on a piece of property that typically would not be able to have this additional dwelling unit built.

El Cajon ADU Project Update

They’ll finish putting the lines in today and get everything back filled before the rain. We can’t have it rain, because what happens is that the trenches will get silted in and then they literally get sealed off so they won’t allow the effluent to percolate down into the ground.

Trenches for the Pump Tank

I’ve moved up here to the top, I wanted to let you see what we put in these trenches. It’s a little hard to see, because there’s a shadow, but these are called an infiltrator. What they are is a dome shape liner that drops in here instead of the pipe and rock that’s been used for a lot of years. We’ve been using these for several years. They make for a much cleaner and a lot more leaching area for the fluid coming out. You can see the lines here and then back over there, and that end is where that surge tank will go and the effluent will then go into that. They’ll be a tight-line, which is a non-perforated line that comes down and ties into this end right here. Then between, they’ll be a line that connects the two together as it drops down the hill.

Have a great day!

Custom Home Building Cost Guide

This “Custom Home Building Cost Guide” will break down every step of the custom home building process. Also included:

  • Budget
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  • Permits & Fees
  • Site Costs
  • Build Costs

Freeman’s Construction Inc. has been building custom homes, accessory dwelling units, and completing whole house remodeling projects in San Diego County for over 39 years. To schedule a project consultation please call us today at 760-788-6846 or fill out a request form here.

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Ramona, CA |Poway, CA | Escondido, CA | Julian, CA | San Marcos, CA |San Diego, CA | Rancho Santa Fe, CA | Lakeside, CA| Rancho Bernardo, CA | Scripps Ranch | Carmel Mountain Ranch | 4 S Ranch | Carlsbad, CA

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