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TRUCHEK Tank-Tightness Testing Procedure 1. Pre-Test Notes: level may cause excessive pressure and damage the tank. 1.1. Do not conduct this TRUCHEK tank-tightness test until after the 2.4. If the connection is visible,check to see there are no monitor- tank is installed and has backfill placed to at least the top of the tank ing-fluid leaks at the standpipe/reservoir connection. 1.2. If the tank contains water or product,do not start the test until 2.5. Using a dipstick or ruler marked with 1/8-inch increments,raise at least 24 hours after product has been delivered to the tank in the monitoring-fluid level into the standpipe approximately 6 to order to equalize the temperature in the tank.Note:The test 12 inches.Do not overfill the standpipe. can also be conducted when the tank is empty. Caution:The tank may be damaged by excessive hydrostatic 1.3. If monitoring wells are in place,ascertain water-table levels prior pressure.To increase the accuracy of the tank-tightness test, to and after the tank-tightness test to assure there is no extreme use water-finding paste to pinpoint the calibrated-dipstick water-table fluctuation during the test.Note:Extreme water- measurements. table fluctuations during the test period may affect the 2.6. If performing the 95%-5%test and dispensing product during results of the tank-tightness test. the test,record the meter reading(s)for the dispenser(s)con- 1.4. The test is considered invalid and should be repeated when test- netted to the tank being tested. ing a 4-foot-,6-foot-or 8-foot-diameter tank if: 2.7. Check the monitoring-fluid level and record it on line la or line • the groundwater level is above the bottom of the tank but 1 b on the Data Log form on the other side of these instructions. below the top of the tank AND if the groundwater level The more accurate the measurement,the more accurate the increases by more than 3 inches during the 4-hour test or tank-tightness test will be. more than 7 inches during the 10-hour test;OR 2.8. If performing the 95%-5%test,wait 4 hours(6 hours for • the groundwater level is above the top of the tank AND the 10-foot-diameter tanks).Then check the monitoring-fluid level water level rises 2 inches during the 4-hour test or more again and record it on line 2a.Note:See the maximum allow- than 5 inches during the 10-hour test. able dispensing volume for product in the test boxes on 1.5.The test is considered invalid and should be repeated when test- Data Log form. ing a 10-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 record it on line 2b.Note:No dispensing of product is increases by more than 4 inches during the 6-hour test or allowed during this extended test. more than 7 inches during the 10-hour test;OR 2.10.Subtract line 2a from line la,or line 2b from 1b.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 2.11.Multiply the figure on line 3 by the calibration factor on line 4 5 inches during the 10-hour test. and enter the result on line 5. 2. Test Instructions: 2.12.Divide the line 5 figure by the number of hours in the test(as 2.1. If it was not previously installed,install a 4-inch NPT threaded noted in line 6). standpipe to the factory-supplied reservoir.Check to see that the 2.13.Enter the result of dividing line 5 by line 6 on line 7.If the fig- threaded connection is tight.Confirm that the standpipe remains ure is 0.05 gallon/hour or less,the tank has passed the test. vented to the atmosphere at all times.(At the owner's discretion, 2.14.Record reading(s)of dispenser(s)after conducting the tank- the standpipe can remain as part of the tank apparatus so the tightness test.Compare these to the readings taken prior to the electronic reservoir-monitoring probe can be checked and future test to verify that you have not exceeded the maximum product- tank-tightness tests can be performed.However,the standpipe is dispensing rate for the specific tank as noted on the TRUCHEK not used in continuous monitoring of the tank,is not part of the Data Log form. monitoring system and is not provided by Xerxes.) 2.15.If the tank test fails,repeat the test to confirm that you made 2.2. Remove the electronic reservoir-monitoring probe through the no errors in the testing procedures.Note:See Points 1.4.and standpipe.Check to see that the probe functions correctly and 1.5.in this procedure for explanation for invalid tests.If the carefully put it in a safe place. test fails again,immediately contact technical support at 2.3. Prepare a monitoring-fluid solution of 30%calcium-chloride Xerxes'corporate office for further instructions. mix.Eight to 10 gallons of monitoring fluid should be all that is 2.16.Afier the test is completed: necessary to top off the reservoir and to raise the fluid level. remove the additional monitoring fluid with a pump and Pour the monitoring fluid through the standpipe in 1-gallon adjust the level of the monitoring fluid in the reservoir to the increments.(If calcium-chloride flakes are available,mix at 5.22 level stated in Monitoring Section of the current Xerxes pounds of flakes to 1 gallon of water.) Installation Manual and Operating Guidelines for Single- Caution:Raising the monitoring-fluid level into the stand- Wall and Double-Wall Fiberglass UndergroundStorage Tanks; pipe is temporary and performed only to determine tank and tightness.In normal use,the monitoring fluid will not rise carefully replace the electronic probe system and check the to the level of the standpipe,which serves only as an access positions of the high-fluid-level and low-fluid-level sensors. to the reservoir.Leaving the monitoring fluid at a raised 2.17.Maintain the Data Log form as a permanent record and submit it to any jurisdiction that requires it. 7901 Xerxes Avenue South, Minneapolis, MN 55431-1288 ■ (952)887-1890 ■ FAX(952)887-1882 ■ www.xerxescorp.com