Underground Tank Installation - Ballasting

In the past twelve months there have been a number of underground tanks that have required retesting and in some cases repairs when they came out of the hole after overnight rain. In all cases the installers had only partially ballasted the tanks or had not ballasted the tanks at all. It is imperative that underground tanks are progressively ballasted while the hole is being backfilled and remain ballasted until the final surface finish above them is completed and cured. Refer to our FRP Installation Manual for the correct installation proceedures.