Installation Procedures - Native Soil

These installation instructions apply to sites with free-flowing native soils
(See Fralo Clay Soil Installation for sites with clay soils)

1. Site Preparation & Notes

Read "Key Roth Installation Facts" first (applies to Roth MultiTank or the Fralo Septic Tank)
Max burial depth is 36" below grade, unless deep burial instructions (steps 11 & 12) on "Key Installation Facts" are followed.
Absolutely no clay should be used for backfill.
Inspect tank for any damage during handling or transportation
Tank must be uniformly supported.
Failure to properly bed tank and compact fill will void the warranty.
Absolutely no water is required for backfill. The tank is designed to be backfilled without water. Filling the tank with water prior to backfilling is not necessary and may cause installation problems. A nominal amount of water (6-8") may be used to ballast tank during backfilling.

2. Excavation Size

Width and length of excavation shall be 18-24" greater than the tank on all sides and ends (FIG. 1).
Depth of the excavation shall be 6" greater than the tank (FIG. 1).
Do no over excavate or "belly-out" the excavation.

3. Bedding the Tank

Add pea stone, sand, gravel or other similar granular material to bed the tank and ensure uniform compaction and that bed is level (FIG. 1)
Native material may be used to bed the tank providing it is properly placed and compacted.

4. Tank Istallation

Prepare the tank for installation. Identify the inlet and outlet ends of the tank. Inlet and outlet may be located on the end or either side ports (per code requirements).
For standard installation, identify drill location A (40" Liquid Level). Drill the inlet and outlet holes using a 5-inch diameter hole saw. (FL & IL tanks are pre-drilled)
IMPORTANT NOTE: For AZ, IL, NE drill dimple B (42" Liquid Level). Florida & Indiana tanks are pre-drilled at the factory.
Install provided rubber gasket in inlet and outlet ports (FIG. 2)

Install the inlet and outlet tees, as required. (FIG. 3) Plumbing tees shall be located as close to the entrancepoint of the tank as possible (just inside the manway opening). Plumbing tees and gas-baffles are factory provided for Indiana tanks.
Install the the required Roth threaded Septic Access Riser System (STAR), provided separately. (FIG. 3) See reverse for directions for sealing the riser system.
Using the corner lifting holes, lower the tank into the excavation. Level the tank, and verify the outlet is lower than the inlet. Install remaining inlet and outlet plumbing. (FIG. 3)

Perform required water tightness, plumbing and/or tank inspection if applicable.

5. Backfill

Backfill in an alternating method around the tank using native material free of debris, sharp stones, and stones greater than 2" in diameter. Soil MUST flow freely into corrugations between tank ribs, including midpoint to belly of tank.
Compact backfill in 6 inch lifts always working on the sides first and then the bulkheads (ends of tank).
Use a hand tamper to achieve sidewall compression through compacted backfill. Mechanical compactors may be used if available on the site. Sidewall compression is essential to provide sidewall restraint after covering the tank. (FIG. 4)

When backfilling the top of the tank, backfill between risers first.
Complete backfilling and grade the area.
Failure to compact fill voids the tank warranty.

Tanks are designed for underground use only.

Installer shall comply with all federal, state, and local regulations.

Tanks are not rated for vehicular traffic. Avoid operation of vehicles heavier than 2500 pounds over the tank.

Internal water temperatures should not exceed 140°F.

Verify no underground utilities or pipes are located in the excavation vicinity.

Where saturated soils or seasonal high water tables are indicated between the bottom of the tank and the ground surface, see separate supplemental installation instructions for these site conditions.

Secure tank access by installing provided stainless steel fastener to the riser and cover.