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TruchekO Hydrostatic Monitoring System-_, Tank-tightness testing How Truchek works Truchek provides two simple test options based on The i nterstice is factory-f i I led with a bri ne sol ution: industry-accepted test criteria: This creates a small hydrostatic pressure on both tank walls Verif ied by U L as meeti ng E PA a nd N FPA 329 The brine solution level is monitored within a criteria reservoir on top of the tank Verified by the National Work Group on Any change in level —either up or down — is Leak Detection Evaluations (NWGLDE) as monitored and alarmed compliant with acceptable test protocols 10-hour test procedure (with tank not in use) Calibrated Truchek meets the strict NFPA 329 criteria and is Dipstick or Puler capable of detecting liquid loss in the tank: For detailed Truchek testing instructions, At a rate of 0.05 U.S. gallons per hour refer to Truchek' With a 99% probability of detection (PD) Testing Instructions With a 1% probability of false alarm (PFA) and Data Log. 4-hour test procedure Monitoring Fluid (with product dispensing) in Standpipe (during test only) Truchek exceeds EPA's tank-tightness test criteria and is capable of detecting liquid loss in the tank: At a rate of 0.05 U.S. gallons per hour With a 95% probability of detection (PD) With a 5% probability of false alarm (PFA) Res@rvolr Ras@rvoir Reservoir Lovel Down Level Dawn Lewl Up Leak in Outer Wall PRIMARY-TANK LEAK SECOND46PY-TANK LEAK SECONDARY-TANK LEAK IN WET HOLE OR DRY HOLE IN DRY HOLE IN WET HOLE Forover45years,Xerxes has designed and man uFactured f berglass underground storage tanks Forfuel, water and wastewater Xerxes'most recent expansion is its HydroChainTm stormwater product line—highly engineered products with site-specif c designs for stormwater management solutions.Xerxes is a key brand of Mattr,a global materials technology company serving critical infrastructure markets. FTRU042S I xerxes.com I fuelsales@mattr.com XERXES @2025 Mattr Corp.All rights reserved.