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C1. Preparation • Most hydrostatically monitored tanks arrive at the jobsite with monitoring fluid already installed in annular space. This section deals only with tanks where the annulus must be liquid filled in the field. • If tank has reservoir installed, and arrives without moni- toring fluid pre-installed, the annular space can be filled with monitoring fluid after tanks have been placed in the excavation. DO • Fill annular space before filling the tank. • Remove primary tank fitting plug. • Inspect inner tank for leaks. DO NOT • Put any product in the inner tank without setting and backfilling to tank top. DO NOT ENTER TANK • Entry can result in: ASPHYXIATION EXPLOSION FIRE C2. Antifreeze Solutions Antifreeze solutions are needed if ambient or product de- livered temperature drops below freezing. Chemically Accepted Antifreeze Solutions • Propylene glycol (food grade) ❑ Always mix before pouring into tank cavity. • Calcium chloride (nontoxic brine). ❑ Is premixed and ready to use. Note: Before selecting antifreeze, always consult local environmental codes for possible restrictions. Freeze Protection % Glycol Mixture (with water) Brine 20OF 20% N/A O°F 30% N/A -20° F 40% N/A -40°F 50% Premixed* * As supplied by Fluid Containment C3. Jobsite Safety Precautions Always wear safety glasses and pro- AWARNING tective clothing when mixing or han- dling any antifreeze solution. 14 • If any of the following accidents occur, quickly take the steps listed. • Contact with eyes (may cause minor eye injuries). ❑ Promptly flush eyes with plenty of water for at least 15 minutes. ❑ Get medical attention. • Contact with skin (may cause minor skin irritations). ❑ Promptly flush skin with plenty of water. • Ingestion (may cause gastrointestinal irritation or ulceration). ❑ Induce vomiting (if swallowed). ❑ Immediately consult a physician. • Spillage (may cause surfaces on which people walk to remain wet longer). ❑ Flush area with plenty of water. C4. Filling the Annular Space If tank is shipped with annular space empty and has a reservoir, follow these instructions to fill the annular space. • Where safety conditions dictate: ❑ Backfill the tank first. ❑ Then fill the annular space. • Where jobsite conditions permit: ❑ Fill the annular space with liquid prior to backfilling. • For Type II tank models: ❑ Contractor may slope tank 2" to minimize trapped air (which may cause a false alarm at a later date) in the cavity. High End of Tank Fiberglass Reservoir optional r Slope Hydrostatic Monitor System Preparation For Filling (If reservoir is located near end of tank). • Set tank in excavation with fiberglass reservoir (see note 2 next page) placed at the high end of tank. • Remove 4" NPT fitting plug in top of reservoir (see note 2 next page) prior to filling the annular space. • Place a standpipe in reservoir (see note, next page) fitting. • Remove 4" NPT fitting plug in 4" monitoring fitting lo- cated on the other end of tank. • Place standpipe in 4" monitoring fitting. ❑ Standpipes (2" diameter or larger recommended) must be a minimum 4' higher than the tank top.