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ARROW TANK WORKS <br /> 1701 SOUTH BARNEY STREET <br /> Mailing Address: P.O. Box 563 <br /> ANDERSON, CALIFORNIA 96007 <br /> PHONE (916) 365-5434 <br /> INSTALLATION: <br /> We recommend that our underground tanks be installed with a minimum <br /> cover of two feel of compacted soil, or one foot of soil under a reinforced con- <br /> crete pad of not less than 4" thick. However, in areas where the installed tank <br /> will be subjected to vehicular traffic, they shall be protected by a minimum of <br /> 18" of compacted soil plus 6" of reinforced concrete, or 8'' of asphalt paving" <br /> extending at least one foot from the tank in all directions, or by a minimum of <br /> three feet of soil. The excavation shall be free of any liquid during the installa- <br /> tion procedure. <br /> The tanks shall be completely empty during installation to prevent any un- <br /> due stress within the tanks. If it is necessary to fill the tanks with product before <br /> backfilling, the product level must not exceed the compacted backfill level. <br /> The tank excavation shall be firm soil suitably graded level, and have 6" <br /> of clean sand or 6'' of pea gravel. The tanks shall be encompassed by clean <br /> sand or pea gravel. There shall be no stones or other matter allowed to come <br /> in contact with the tanks. <br /> If the installation site is such that the tanks require a concrete balast slab <br /> and hold down straps, refer to our hold down chart and NFPA pamphlet #30. <br /> Material used for backfill must be capable of being 95% compacted. The <br /> material shall be placed in 6'' layers and tamped down. Cradles or chocking <br /> blocks should not be used. They may cause tank failure due to stress <br /> concentrations. <br />