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TANK INSTALLATION /ADDING TANKS AT EXISTING LOCATIONS <br /> Figure lla 11.4.8. After the final measurement has been <br /> Fourth Vertical Diameter Measurement recorded,complete the Vertical Diameter <br /> Measurement section of the Tank Installation <br /> Checklist.Verify the values in Table 11-1 have <br /> Fill Pipe �to5ubgrade <br /> not been exceeded. <br /> 11.4.9. If the final deflection measurement exceeds <br /> the values in Table 11-1 you should stop the <br /> installation prior pouring the concrete ad <br /> / p 9 P <br /> and immediately contact CSI Tank Technical <br /> Support for directions. <br /> Avoid surface loads that may result in a collapse of the <br /> excavation or disturb any existing tanks. <br /> 12.1. Additional tanks maybe installed at existing <br /> Measure from the bottom of the tank locations using one of the following methods: <br /> to the top of the fill pipe. 12.2. Preferred Method <br /> 11.4.6. Take the Fifth Vertical Diameter Measurement 12.2.1. Install a new tank in a separate hole at least <br /> and record the value on the Tank Installation 36'from the original excavation. <br /> Checklist(see Figure 11-8). 12.2.2. Follow procedures outlined in this Installation <br /> Figure 11-8 Manual. <br /> 12.2.3. Maintain a minimum 36"at grade of native soil <br /> Fifth Vertical Diameter Measurement between existing and new installation <br /> Fill Pipe (see Figure 12-1). <br /> Fitting Figure 12-1 <br /> 2 36"� <br /> 5 min. <br /> Nail <br /> j/ Existing New <br /> \\/ Tank <br /> 12.3. Alternate Method For Dry Hole <br /> Excavation <br /> This measurement istaken by: 12.3.1. Lower ballast in existing tanks to less than <br /> 1. Driving a nail into the 1"point at a right angle 25%capacity. <br /> to the gauge stick. 12.3.2. Remove the surface slab. <br /> 2. Lower the gauge stick down the fill pipe far 12.3.3. Enlargetheexcavationforthenewtanks, <br /> enough to extend builtelow the <br /> cam of the fitting. leavinas much backfill as possible around <br /> 3. Lift the gauge stick until the nail catches on the 9 <br /> lip of the fitting. the existing tanks(see Figure 12-2). <br /> 4. Read the measurement at the top of the fill pipe. <br /> 5. Subtract l"to allow for the point where the nail Figure 12-2 <br /> is in the gauge stick. <br /> 11.4.7. The inner diameter measurement is calculated <br /> by subtracting the"Fourth Vertical Diameter Exlstmg existing <br /> Measurement"and"Fifth Vertical Diameter Tank Tank Newrank <br /> Measurement" <br /> 21 <br />