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Installation Ovivew Fiberglas° underground ' tanks must be installed in accordance with the installa- tion instructions (O/C TANKS r publication number 3-PE-6304). This document should be part of your tank specifications. 4y" Some key installation steps y , are highlighted below. See the published installation instruc- tions for complete details. Double-wall tanks must be mechanically unloaded from the delivery truck using a backhoe or crane. A special air test procedure is required for double-wall tanks. A special air test fix- ture is shipped with the tank. Fiberglas tanks must be pres- surized and inspected for leaks using a soapy water solution. Leak testing prior to installa- tion helps insure that Fiberglas If the Hydrostatic Tank Moni- Properly installed, Fiberglas tanks were not damaged in toring system is activated by underground petroleum shipment. filling at the jobsite, the tank storage tanks can provide Installation for double-wall tanks cavity must be filled by pouring extended service in storing is similar to the procedure for the liquid into the cavity. Use petroleum products without single-wall tanks. O/C TANKS tap water or an acceptable corrosion-caused leaks and requires pea gravel backfill antifreeze mixture as the without maintenance. material; this gravel is a natu- monitoring fluid. rally rounded aggregate rang- O/C TANKS maintains a listing ing from 1/8" to 3/4" diameter. All tanks must be vented. of over 1,200 independent con- If pea gravel is not available, Fiberglas tanks are designed tractors who have been trained washed stone crushings (1/8" for operation at atmospheric to install Fiberglas tanks. On to 1/2" diameter) meeting pressure only, except for use request,we can provide names ASTM C-33 may be used as with vapor recovery systems, of trained contractors. an alternate. Other backfill provided the pressure or materials must not be used vacuum does not exceed without consulting O/C TANKS 1 psi maximum on the primary for written approval. tank. If the monitoring cavity between the inner and outer A minimum of 12" backfill tank is vented, it must be bedding is required between vented independently from the tank and the excavation the primary tank. bottom or concrete anchoring pad. Tanks must not be For additional details, request installed on timbers, beams Underground Tank Installations or cradles. (O/C TANKS publication number 3-PE-6304). 27