What is the recommended treatment method when encountering backfilled soil in a trench?

When encountering backfilled soil in a trench, the recommended treatment method is ground rod treatment. This method is particularly effective for treating areas where the soil has been disturbed or replaced, as is common with backfilled trenches.

Ground rod treatment involves inserting chemical treatments directly into the soil through rods, which helps to ensure that the termiticide reaches the required depth and treats the soil adequately around and beneath the backfill. This approach allows for the direct application of treatment in areas that might be otherwise difficult to reach or saturate effectively with liquid applications due to the compaction of backfilled soil.

Other methods, such as vertical drilling or horizontal treatment, can also be utilized in some scenarios, but they may not be as effective in ensuring thorough distribution of the chemical in backfilled areas. Using chemical foam could be beneficial in certain situations, usually around voids or inaccessible spaces, but it is not the primary or recommended method for treating backfilled soil in a trench. Thus, ground rod treatment stands out as the best practice in this context.