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*Its of Third -Party Evaluation Ulquid-Phase OutAX-Tank Product: Detectors This • 1 documentsperformanceoftheliquid-phase product detector described i r The evaluationwas conducted •. the • i Ii 1 eror consultant to the manufacturer according to the U.S. EPA!s 'Revised Standard Test Procedure for Evaluating Leak Detection Methods:r IOut-of-Tank • r i Tank owners using this leak detection system should keep this form on file to prove compliance with the federalregulations. i owners shouldcheckstateand local agenciesto verify that r • r satisfies their requirements. Method Description • •• • ..• �. - � rr r i1 r � r � Vendor 3029 E. Washington Street (street address) c Yj�r state) Detector output type: ❑ Quantitative ® Qualitative Detector Operating Principle: ® Electrical Conductivity ❑ Thermal Conductivity ❑ interface Probe ❑ Product Soluble ❑ Other Detector sampling frequency: ❑ intermittent (D Continuous Evaluation Results The detector described above was tested for its ability to detect layer of hydrocarbon liquid floating on water. The following parameters were determined. Accuracy- How closely the product thickness, as measured by the detector, agrees with the actual thickness. Bias- Whether the method consistently over-estimates or under -estimates product thickness. Not applicable to qualitative detectors. Detection Time- Amount of time the detector must be exposed to product before it responds. Fall Time- Amount of time that passes before the detector returns to its baseline reading after the product is removed. Radian Corporation. Development of Procedures to Assess the Performance of External Leak Detection Devices: Liquid -Phase ASTM -Formatted Methods. Draft Report, EPA Contract No. 68-03.3409. Work Assignment 22. June 29. 1990. Liquid -Phase Product Detector - Results Form Page 1 of 2