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Septic Construction

Septic System Construction Or Repair Estimate 466-9607
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In order to determine the size of  the septic tank and type of leaching system needed
Health Department officials will require that a soil percolation test or "perk" test be performed for the installation of new residential and commercial septic systems.
The results of this test will determine the size and type of system needed for your location  In some cases an Engineered System will be required.
Drain field and tank size are based on the number of bedrooms in the proposed home and must take into account soil conditions setback requirements from property lines wells rivers streams wetlands water supply lines or other encumbrances.
Commercial septic systems are sized based on specific criteria such as the type of establishment and the amount of water discharged into the system on a daily basis.  The Environmental Health Department has calculation requirements for commercial septic systems.
In the most common design of a drain field perforated pipes are buried in gravel-filled trenches to form the drain field. Infiltrator Chambers are now commonly used in place of rock filled trenches.
In some cases rock filled dry wells or sumps are placed at the end of the leach line.
This method is used in cases where the soil encountered in the leach line is not suitable for long term absorption.
Leach lines are placed  on flat ground or across the slope line of sloped property. While some experts describe the bottom of these trenches as "level" in practice they are dug to slope slightly perhaps 1/32" per foot or less.  A typical trench is 18 to 30 inches in depth, 24" wide not to exceed 42" in depth. Trenches that will exceed the maximum 42" depth will require a Lift Pump in order to meet the depth standard. This standard is applied to new residential and commercial septic system installation's, and commercial system repairs.
The trenches are dug 10 feet apart which will allow space for a set of replacement trenches to be placed between the original ones when the first set fail. This is only allowed when the designated replacement area has been fully utilized.
The total depth of the leach line is based on a starting elevation. The elevation is the depth of the waste line as it exits the dwelling based on the dirt grade and the distance from the dwelling to the area where the tank will be placed.
In San Joaquin County if trenches are going to exceed 42" in depth a lift pump will be required in order
to maintain a preferred shallow depth. This will add additional cost to the installation of the septic system
Be sure your  building contractor is aware of this and keeps the waste line as shallow as possible.
It's Easy to Ruin or Shorten the Life of a Drain field.
Failure to pump out the septic tank regularly (solids and grease are discharged into the absorption lines clogging the soil) 
Drive over the drain field or build a parking lot over it.  This will compact soil and break pipes.
Plant large trees over the septic absorption field so roots can enter pipes or even break them.
Direct run off from the roof or downspout's.  Not maintaining positive drainage away from the leach field area  Rain water collecting above the tank lids.
Dumping illegal chemicals and oils or pesticides paint and caustic drain cleaners in your septic tank.
For more information on what not to put in you septic tank visit our Septic pumping information page.
For more information regarding the size and type of leaching system that is required for your project you can also contact San Joaquin County Environmental Health Department @ (209) 468-3420 Or Visit Their Website
Typical Infiltrator Leach Line Chamber System
"Modern" Parrish Septic System Circa 1940's

Call Us Today At ♦ (209) 466-9607



P O BOX 8580
Phone: (209) 466-9607‚Äč
D.A. Parrish & Sons Inc. is licensed by the State of California in the classification of General Engineering & Sanitation System Contractor
License # 100511

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