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WARNING: All internal piping must be at least 4" (6" for 12' diame- ter tanks) from the tank bottom. Refer to Figure 91 and Table 91 to determine the correct dimen- sions to size internal pumps and piping. When the tank's interstitial space is filled with a liquid, the space must be vented. It is sufficient to drill a 1/4" - diameter hole in the side or cap of the monitor system riser pipe. When the ground- water level will be high enough to enter a drilled vent hole, install a separate vent line from the riser pipe to above grade level. When the interstitial space is dry, it is not necessary to vent the space to atmosphere. It is the installer's responsibility to select a thread sealant that is compatible with the product being stored. Some sealants cannot be used with some products. If necessary, remove, clean and redope all plugs. B8 E H --7777m--A 6 0 -G DIMENSION LINE DETAIL DIMENSION LINE DETAIL SINGLE WALL 6DOUBLE HALL II DOUBLE MALL I SCALE. 1/16 SCALE, 7/16 "B" .C. ,A, "F" ,D, SINGLE WALL DOUBLE WALL 11 DOUBLE WALL I RIBBED OUTER WALL SMOOTH OUTER WALL NOTE, I - ALL FITTING DIMEN51ON5 ARE MEASURED FROM THE TOP OF A SERVICE FITTING TO THE INSIDE BOTTOM OF THE TANK AND INCLUDE GAUGE PLATE CLEARANCE. 2 - INTERIOR DIAMETERS DO NOT INCLUDE GAUGE PLATE CLEARANCE. FIGURE 91 TABLE 9-1 All piping must conform to all applicable codes and standards. See INTRODUCTION. WARNING: When pressure testing the piping, the tank must be isolated from the piping system. The test pressures for piping may cause the tank to explode and cause death, severe personal injury or property damage. CAUTION: When extending monitoring or vapor recovery piping to the surface, be sure that the at -grade fittings are different from any fill fittings and will not accept standard fill hoses. If the tank has a sump or a bottom fitting, take extra care that the tank does not rest on it prior to installation. During installation, provide a clear area in the bedding material, so that the tank rests on the bedding and the sump or bottom fitting is clear. After setting the tank, fill and tamp the resulting void by hand before continuing the backfilling. When the tank has been set, tested and backfilled, and all piping and venting has been completed, the balance of the backfill material may be added. When the tank has been backfilled to subgrade, take the final diameter reading (Deflection reading "B" on the checklist). The same material as specified in Section 3 must be used to completely fill excavation. The backfill must be free of debris. Any blocks or bricks used as support material during piping must be removed prior to completion of backfilling. Safety measures, such as placing barricades until installation is complete, should be used around the excavation site. Be sure that the installation meets all of the requirements of minimum cover as specified in Section 4. Be sure that the checklist is properly completed. DIPSTICK PREPARATION Drive a small -headed, non -sparking (e.g. brass) nail into a wooden dipstick at the 1" mark. FIRST DIAMETER READING 1. Place the dipstick into a service fitting. 2. Measure and record the distance from the tank bottom to the top of the fitting. 3. Pull the dipstick up until the nail catches on the inside top of the tank. 4. Measure the distance from the tank top (inside) to the top of the fitting. Subtract 1" from this measurement and record the distance. 5. Subtract the second distance from the first and record this value as reading `A" on the Installation Checklist. SECOND DIAMETER READING 1. Place the dipstick into a service fitting with a riser installed to subgrade. 2. Measure and record the distance from the tank bottom to the top of the standpipe. 3. Pull the dipstick up until the nail catches on the inside top of the tank. 4. Measure the distance from the tank top (inside) to the top of the standpipe. Subtract 1" from this measurement and record the distance. 5. Subtract the second distance from the first and record this value as reading "B" on the Installation Checklist. INTERIOR DIMENSIONS (IN) TANK DIA. A.. 8., "C„ „D„ "E,. ,.F., "G„ "H,. "I" 4' 49.50 54.50 48.00 51.50 56.625 48.00 6' 73.00 78.00 71.36 72.75 77.75 70.625 75.125 80.25 71.36 8' 93.00 98.00 91.188 92.75 97.75 90.625 95.375 100.50 91.188 10' 121.00 126.00 119.16 120.75 125.75 118.50 123.50 128.625 119.16 12' 138.25 143.25136.625 All piping must conform to all applicable codes and standards. See INTRODUCTION. WARNING: When pressure testing the piping, the tank must be isolated from the piping system. The test pressures for piping may cause the tank to explode and cause death, severe personal injury or property damage. CAUTION: When extending monitoring or vapor recovery piping to the surface, be sure that the at -grade fittings are different from any fill fittings and will not accept standard fill hoses. If the tank has a sump or a bottom fitting, take extra care that the tank does not rest on it prior to installation. During installation, provide a clear area in the bedding material, so that the tank rests on the bedding and the sump or bottom fitting is clear. After setting the tank, fill and tamp the resulting void by hand before continuing the backfilling. When the tank has been set, tested and backfilled, and all piping and venting has been completed, the balance of the backfill material may be added. When the tank has been backfilled to subgrade, take the final diameter reading (Deflection reading "B" on the checklist). The same material as specified in Section 3 must be used to completely fill excavation. The backfill must be free of debris. Any blocks or bricks used as support material during piping must be removed prior to completion of backfilling. Safety measures, such as placing barricades until installation is complete, should be used around the excavation site. Be sure that the installation meets all of the requirements of minimum cover as specified in Section 4. Be sure that the checklist is properly completed. DIPSTICK PREPARATION Drive a small -headed, non -sparking (e.g. brass) nail into a wooden dipstick at the 1" mark. FIRST DIAMETER READING 1. Place the dipstick into a service fitting. 2. Measure and record the distance from the tank bottom to the top of the fitting. 3. Pull the dipstick up until the nail catches on the inside top of the tank. 4. Measure the distance from the tank top (inside) to the top of the fitting. Subtract 1" from this measurement and record the distance. 5. Subtract the second distance from the first and record this value as reading `A" on the Installation Checklist. SECOND DIAMETER READING 1. Place the dipstick into a service fitting with a riser installed to subgrade. 2. Measure and record the distance from the tank bottom to the top of the standpipe. 3. Pull the dipstick up until the nail catches on the inside top of the tank. 4. Measure the distance from the tank top (inside) to the top of the standpipe. Subtract 1" from this measurement and record the distance. 5. Subtract the second distance from the first and record this value as reading "B" on the Installation Checklist.