GA onsite - ATU and drip irrigation

What do aerobic treatment units do?

Treat wastewater by mechanically bringing it into direct contact with air

Where does pretreatment occur for an ATU?

a single compartment septic tank

What must an ATU possess to notify the owner of failure?

an audible/visible alarm on separate circuits

How far away must you be able to hear and see the alarm for an ATU?

50 feet

ATUs must have what with information about the unit?

2 data plates

Where should the data plates on an ATU be located?

• front of the electrical control box

• tank, aeration equipment assembly, or riser that is often accessed for maintenance

What information should be on the ATU’s data plates?

• manufacturer name/address

• model number

• serial number

• daily hydraulic capacity

• system classification

Instructions for unit service of an ATU must be located where?

near the failure signal

The owner of an ATU system must have an initial service policy of how long?

3 years/6 inspections

After the initial service policy, what must the owner of the ATU system do?

obtain an extended service policy or insure that equivalent maintenance and repair service is provided for the life of the system

Drip emitter systems are preceded by what?

an ATU

The dosing chamber for a drip emitter system must have what?

an audible/visible alarm

Drip emitter systems must be equipped to detect what?

• 10% change in flow rate

• force main break

• emitter clogging

• field line leaks

• flush valve failure

When are drain backs required for a drip emitter system?

when slopes exceed 5%

How far apart are emitter lines, typically?

1-2 feet

On slopes exceeding 20%, how far apart are the emitter lines?

3 feet

The filtration system a drip emitter system must be what?

self-cleaning with a backwash line to the treatment unit

Individual emitter lines may have a variance of what?

6 inches

Where should emitter lines be installed?

• root zone

• 8-12 inches from ground surface

How often should the distribution lines be automatically flushed?

bi-monthly

What is the minimum distance between the drip irrigation system and the water table/impervious layer?

12 inches

For a drip irrigation system, what is the maximum grease content allowed in the waste stream?

25 mg/L