Recommended Practices When Choosing Multiple Backfill Materials
- Most installations use 100% Primary Backfill when installing tanks.
- Some projects may be eligible to use less than 100% Primary Backfill (as described in the Installation Manual and Operating Guidelines) with another material (“Secondary Backfill”).
- These installations are referred to as “Split Backfill” Installations. Refer to the “Do” and “Do Not” tables on the left side of this document before proceeding.
- In Split Backfill Installations, after Primary Backfill has been brought to 50% of the tank diameter, the diagram below illustrates how Secondary Backfill may be utilized:
