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®WARNING Overfill protection, such as automatic shut-off devices or vent -restriction devices, should not be installed if owner/operator will allow pump or pressure filling of the tank. Failure to follow this instruction could cause tank failure and result in death or serious injury. 11.4. VENTING INTERSTITIAL SPACE CAUTION All reservoirs must be vented for proper operation. 11.4.1. When the tank's interstitial space is filled with a monitoring fluid, the space must be vented. It is sufficient to drill a 1/4 -inch -diameter hole in the side or cap of the reservoir standpipe as supplied by the installer. If the groundwater level could be high enough to enter a drilled vent hole, install a vent line from the standpipe to above high-water level. 11.4.2. When the interstitial space is dry, it is not necessary to vent the space to atmosphere. 12.1. GENERAL 12.1.1. Xerxes recommends only gravity filling of tanks. 12.1.2. See SECTION 18, Operating Guidelines. 13.1. GENERAL 13.1.1. Continue to take safety measures (such as placing barri- cades) around the excavation site until installation is completed. 13.1.2. When the tank has been set, tested and backfilled, and all piping and venting has been completed, add the balance of the backfill material. 13.1.3. The backfill must be free of debris, ice or snow. Any blocks or bricks used as support material during piping must be removed prior to completion of backfilling. 13.1.4. The backfill material specified in SECTION 4 must be used to completely fill excavation. 13.1.5. Be sure that the installation meets all of the require- ments of minimum cover as specified in SECTION 5. 13.1.6. When the tank has been backfilled to subgrade (before placement of asphalt or concrete), take a measurement of the internal diameter of the tank. (See SECTION 14 of the Installation Manual for instructions on taking diameter measurements.) Record this measurement as Final Internal Diameter on the Tank Installation Checklist, SECTION 4. 13.1.7. Complete the Tank Installation Checklist. 19 11 14.1. GENERAL 14.1.1. Obtain the deflection measurement by taking a minimun of two measurements of the internal diameter of the tank. 14.1.2. Two methods of measuring the internal diameter of the tank are described here. Both methods use a dipstick. (Similar methods can be used, such as with a tape measure, etc.) 14.1.3. The deflection measurement can be obtained by using either method twice or by using each method once. Each will be described here as if that method were being used twice. 14.1.4. Take the initial internal -diameter measurement before backfilling the tank. (See Point 8.2.8.) In a wet -hole installation, take this measurement before the tank is placed in the excavation hole. (See Point 8.3.1.1.) 14.1.5. Take other diameter measurements during the backfilling process to determine whether vertical deflection continues to be within the limits specified by Xerxes. (See Point 6.4.6. and Point 9.1.1.) 14.1.6. Take the final internal -diameter measurement when the tank has been backfilled to subgrade. (See Point 13.1.6.) 14.1.7. For both methods, drive a small -headed, nonsparking nail (for example, brass) halfway into a wooden dipstick 1 inch above its base. 14.2. INTERNAL -DIAMETER MEASUREMENT WITHOUT A STANDPIPE 14.2.1. Place the dipstick into a service fitting. 14.2.2. Measure and record the distance from the tank bottom to the top of the fitting. 14.2.3. Pull the dipstick up until the exposed nail catches on the inside top of the tank. 14.2.4. Measure the distance from the tank top (inside) to the top of the fitting. Subtract 1 inch from this measurement and record the distance. 14.2.5. Subtract the second distance (inside tank top to top of fitting) from the first distance (tank bottom to top of fitting). Record this measurement as Initial Internal Diameter on the Tank Installation Checklist, SECTION 4. 14.2.6. For subsequent measurements of the internal diameter, repeat Points 14.2.1. through 14.2.5. When the measurement is the final diameter measurement, record this measurement as Final Internal Diameter on the Tank Installation Checklist, SECTION 4. 14.3. INTERNAL DIAMETER MEASUREMENT WITH A STANDPIPE 14.3.1. Place the dipstick into a service fitting with a standpipe. 14.3.2. Measure and record the distance from the tank bottom to the top of the standpipe.