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Tank Installation (Backfill to Subgrade) M= e • Take the Fifth Vertical Diameter Measurement and record the value on the Tank Installation Checklist Do not ballast tank until backfill is even with tank (see Figure 1-9). top or tank damage can occur. Figure 1-9 • After backfill is even with tank top,fill all tank Fifth Vertical Diameter Measurement compartments with ballast to minimize chance of tank buoyancy. Ful Pipe • Additional information on alternate installation F't"'9 techniques is available(see Supplemental Documents, : 2" Section R). 15 BACKFILL TO SUBGRADE • When the tank has been lowered into the excavation and all testing, backfilling, venting and piping has been completed; add the remaining backfill material to subgrade. • Approved pea gravel or crushed stone must be used to backfill the tank a minimum of 75% up the side wall of the tank(s). • If alternative smaller or finer backfill material is used to subgrade, geotextile fabric is required (see Supplemental Documents, Section R). This measurement is taken by: • Once the tank has been backfilled to subgrade, before 1. Driving a nail into the 1"point at a right angle placement of concrete pad, take the fourth vertical to the gauge stick. diameter measurement. 2. Lower the gauge stick down the fill pipe far • Take the Fourth Deflection Measurement and record enough to extend below the bottom of the fitting. �v the value on the Tank Installation Checklist 3. Lift the gauge stick until the nail catches on the (see Figure 1-8). lip of the fitting. Figure 1-8 4. Read the measurement at the top of the fill pipe. Fourth Vertical Diameter Measurement 5. Subtract 1"to allow for the point where the nail is in the gauge stick. Backfill Fill Pipe to SubpreCe • The inner diameter deflection is calculated using the "Fourth Vertical Diameter Measurement"and "Fifth Vertical Diameter Measurement". �i�i • After the final measurement has been recorded, '; :,:::<:•:: :::::ii��i complete the Vertical Diameter Measurement section of the Tank Installation Checklist.Verify the values in �i Table 1-1 have not been exceeded. • If the final deflection measurement exceeds the values in Table I-1 you should stop the installation, prior to pouring the concrete pad, and immediately contact CSI Tank Technical Support for directions. \/ \� Measure from the bottom of the tank to the top of the fill pipe. 21