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NONE& 0 <br /> • Take the Fifth Vertical Diameter Measurement and <br /> record the value on the Tank Installation Checklist <br /> Do not ballast tank until backfill1s even with tank (see Figure 1-9). <br /> top or tank damage can occur. <br /> Figure I-9 <br /> • After backfill is even with tank top, fill all tank FftiVerficall D110meftr Measumniq0t, <br /> compartments with ballast to minimize chance of tank <br /> buoyancy. Fill Pipe <br /> • Additional information on alternate installation Fitting <br /> techniques is available(see Supplemental Documents, 2a <br /> Section R). 15 <br /> Nail <br /> 1" <br /> BACKFILL TO SUBGRADE <br /> • When the tank has been lowered into the excavation <br /> and all testing, backfilling,venting and piping has <br /> been completed; add the remaining backfill material to <br /> subgrade. X� <br /> • If alternative smaller or finer backfill material is used <br /> above the tank top, geotextile fabric is required <br /> (see Supplemental Documents, Section R). <br /> • Once the tank has been backfilled to subgrade, before <br /> placement of concrete pad,take the fourth vertical <br /> diameter measurement. This measurement is taken by: <br /> • Take the Fourth Deflection Measurement and record 1. Driving a nail into the 1"point at a right angle <br /> the value on the Tank Installation Checklist to the gauge stick. <br /> (see Figure 1-8). 2. Lower the gauge stick down the fill pipe far <br /> Figure 1-8 enough to extend below the bottom of the fitting. <br /> Foes, Ale I DI ` Ma rent 3. Lift the gauge stick until the nail catches on the <br /> lip of the fitting. <br /> Backfill <br /> Fill Pipe to Su rade 4. Read the measurement at the top of the fill pipe. <br /> 5. Subtract 1"to allow for the point where the nail <br /> is in the gauge stick. <br /> ��%�� • The inner diameter deflection is calculated using the <br /> "Fourth Vertical Diameter Measurement"and <br /> \j\ <br /> "Fifth Vertical Diameter Measurement". <br /> ii <br /> i���i� • After the final measurement has been recorded, <br /> complete the Vertical Diameter Measurement section <br /> ���\� of the Tank Installation Checklist.Verify the values in <br /> i��� Table 1-1 have not been exceeded. <br /> �i��i • If the final deflection measurement exceeds the <br /> ������� .���������%�� values in Table 1-1 you should stop the installation, <br /> prior to pouring the concrete pad, and immediately <br /> Measure from the bottom of the tank contact CSI Tank Technical Support for directions. <br /> to the top of the fill pipe. <br /> 21 <br />