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A3. Pre -Installation Testing (con't) Step #4 • Monitor the pressure readings for at least 30 minutes. • At the same time, cover tank outer surface with soap solution (see Visual Air/Soap Test on page 3). • Carefully inspect for leaks as indicated by bubbles. Inner Wall Test Step #5 • Close manifold valve to annular space. • Open air supply valve to vent primary tank. • Maintain 5 psi pressure on the annular space. Step #6 • Monitor air gauge on tank for another 30 minutes, but not more than 60 minutes. After successfully completing air test: • Release pressure. • Disconnect and remove air manifold fittings, hose and valve. Testing Double -Wall Tanks (Hydrostatically Monitored) with Annular Space Filled This tank has a hydrostatic monitoring system that includes a nontoxic colored monitoring fluid between the tank walls. This fluid is a brine solution (30% calcium chloride). In the unlikely event of a tank leak, this monitoring fluid will leave a colored trace on the tank. Reservoir Level Check: DO • Remove the 4" plug from the reservoir fitting. • Inspect for monitoring tracer fluid. • If reservoir is empty, immediately call Fluid Contain- ment Field Service. Phone number is listed on page 2. Outer Wall Test Step #1 • Closely inspect outer wall for any trace of colored moni- toring tracer fluid. Important: If a colored fluid is found during any test, dis- continue the installation and immediately contact Fluid Con- tainment Field Service. Phone number listed on page 2. Step #2 DO • Tighten all fitting plugs to the annular space and reser- voir to avoid spilling monitoring fluid_ • Inspect tank bottom by lifting tank. • After completing inspection of tank bottom, replace tank on bumper pads. 4 DO NOT • Rotate tank. • Stand under tank while tank is in the air. Injury or death could occur. Step #3 DO • Connect air compressor line to primary tank fitting. • Use a pressure relief valve. • Pressurize primary tank to 5 psi maximum. DO NOT • Attach air pressure line to any annular space fitting. • Lift tank with pressure on it. This could result in per- sonal injury. Step #4 • Apply a soapy water solution to all fittings and manways. • Check for leaks as indicated by bubbles. • If bubbles are present, tighten the plugs or bolts and retest. Inner Wall Test • Release pressure from primary tank. • Remove primary tank fitting plug. • Look inside for any accumulation of monitoring tracer fluid. Important: If a colored fluid is found during any test, discontinue the installation and immediately contact Fluid Containment Field Service. Phone number is listed on page 2. • Replace and tighten fitting plug. A4. Hole Size Important: If tanks are mechanically anchored, additional clearance is required between tanks. (See section A7) Stable Excavations • 4' through 10' diameter tanks require: 0 Minimum of 18" (24 preferred) between adjacent tanks. 0 Minimum of 18" (24" preferred) between tank sides and ends and the walls of the excavation. %11/x/// . • 4' through 10' diameter tanks require: 0 Minimum of 18" (24 preferred) between adjacent tanks. 0 Minimum of 18" (24" preferred) between tank sides and ends and the walls of the excavation.