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:� XERXES" TrucheckO Tank-Tightness Testing Procedure 1.PRETEST NOTES 2.4. If the connection is visible,check to see there are no 1.1. Do not conduct this TRUCHEK tank-tightness test until after monitoring-fluid leaks at the stand pi pe/rese rvoi r connection. the tank is installed and has backfill placed to at least the top of 2.5. Using a dipstick or ruler marked with 1/8-inch increments, the tank. raise the monitoring-fluid level into the standpipe approximately 1.2. If the tank contains water or product,do not start the test 6 to 12 inches. Do not overfill the standpipe. until at least 24 hours after product has been delivered to the tank in order to equalize the temperature in the tank. NOTE:The CAUTION test can also be conducted when the tank is empty. The tank may be damaged by excessive hydrostatic pressure.To 1.3. If monitoring wells are in place,ascertain water-table levels increase the accuracy of the tank-tightness test,use water-finding prior to and after the tank-tightness test to assure there is no paste to pinpoint the calibrated-dipstick measurements. extreme water-table fluctuation during the test. NOTE: Extreme water-table fluctuations during the test period may affect the 2.6. If performing the 95%-5%test and dispensing product results of the tank-tightness test. during the test,record the meter reading(s)for the dispenser(s) 1.4.The test is considered invalid and should be repeated when connected to the tank being tested. testing a 4-foot-,6-foot-or 8-foot-diameter tank if: 2.7.Check the monitoring-fluid level and record it on line 1 a or -The groundwater level is above the bottom of the tank but line 1 b on the Data Log form on the other side of these below the top of the tank AND if the groundwater level increases instructions.The more accurate the measurement,the more by more than 3 inches during the 4-hour test or more than 7 accurate the tank-tightness test will be. inches during the 1 0-hour test; OR 2.8. If performing the 95%-5%test,wait 4 hours(6 hours for 10- -The groundwater level is above the top of the tank AND the foot-diameter tanks).Then check the monitoring-fluid level again water level rises 2 inches during the 4-hour test or more than 5 and record it on line 2a. NOTE: See the maximum allowable inches during the 1 0-hour test. dispensing volume for product in the test boxes on Data Log 1.5.The test is considered invalid and should be repeated when form. testing a 1 0-foot-diameter tank if: 2.9. If performing the 99%-1%test,wait 10 hours after the initial -The groundwater level is above the bottom of the tank but measurement.Then check the monitoring-fluid level again and below the top of the tank AND if the groundwater level increases record it on line 2b. NOTE: No dispensing of product is allowed by more than 4 inches during the 6-hour test or more than 7 during this extended test. inches during the 1 0-hour test; OR 2.10.Subtract line 2a from line 1 a,or line 2b from 1 b. Enter the -The groundwater level is above the top of the tank AND the figure on line 3. water level rises 3 inches during the 6-hour test or more than 5 2.11. Multiply the figure on line 3 by the calibration factor on line inches during the 1 0-hour test. 4 and enter the result on line 5. 2.12. Divide the line 5 figure by the number of hours in the test 2.TEST INSTRUCTIONS (as noted in line 6). 2.1. If it was not previously installed,install a 4-inch NPT 2.13. Enter the result of dividing line 5 by line 6 on line 7. If the threaded standpipe to the factory-supplied reservoir.Check to figure is 0.05 gallon/hour or less,the tank has passed the test. see that the threaded connection is tight.Confirm that the 2.14. Record reading(s)of dispenser(s)after conducting the standpipe remains vented to the atmosphere at all times.(At the tank-tightness test.Compare these to the readings taken prior owner's discretion,the standpipe can remain as part of the tank to the test to verify that you have not exceeded the maximum apparatus so the electronic reservoir-monitoring probe can be product-dispensing rate for the specific tank as noted on the checked and future tank-tightness tests can be performed. TRUCHEK Data Log form. However,the standpipe is not used in continuous monitoring of 2.15. If the tank test fails,repeat the test to confirm that you the tank,is not part of the monitoring system and is not provided made no errors in the testing procedures. NOTE:See Points by Xerxes.) 1.4.and 1.5.in this procedure for explanation for invalid tests. If 2.2. Remove the electronic reservoir-monitoring probe through the test fails again,immediately contact technical support at the standpipe.Check to see that the probe functions correctly Xerxes'corporate office for further instructions. and carefully put it in a safe place. 2.16.After the test is completed: 2.3. Prepare a monitoring-fluid solution of 30%calcium-chloride -Remove the additional monitoring fluid with a pump and adjust mix. Eight to 10 gallons of monitoring fluid should be all that is the level of the monitoring fluid in the reservoir to the level stated necessary to top off the reservoir and to raise the fluid level. in Monitoring Section of the current Xerxes Installation Manual Pour the monitoring fluid through the standpipe in 1-gallon and Operating Guidelines for Single-Wall and Double-Wall increments. (If calcium-chloride flakes are available,mix at 5.22 Fiberglass Underground Storage Tanks;and: pounds of flakes to 1 gallon of water.) -Carefully replace the electronic probe system and check the positions of the high-fluid-level and low-fluid-level sensors. CAUTION 2.17. Maintain the Data Log form as a permanent record and Raising the monitoring-fluid level into the standpipe is temporary submit it to any jurisdiction that requires it. and performed only to determine tank tightness. In normal use, the monitoring fluid will not rise to the level of the standpipe, which serves only as an access to the reservoir. Leaving the monitoring fluid at a raised level may cause excessive pressure and damage the tank. @ 2025 Mattr Corp. All rights reserved. xerxes.com XTIS-TRTT 0723