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FROM <br /> Water Boards: LG i 13 (TUE)JUN 2 2009 1�1/ST. 18: 16/No. 6801210790 P 9 <br /> . <br /> Page-2 of 2 <br /> Depth to groundwater in tank excavation backfill must be determined. <br /> When the interior hydrostaticpressure of the component*being tested is less than the exterior <br /> hydrostatic pressure, the use of other test method(s)such as water ingress measurements must be <br /> incorporated. <br /> At the discretion of the regulatory agency,water ingress measuring devices may be used to supplement <br /> test method in high groundwater conditions.** <br /> When the regulatory agency allows tesing to be performed withgroundwater above thebottom of tanks <br /> containing water based or water soluble products,.the Product must be removedfromthe tank prior to <br /> testing. <br /> Comments *This method can be used to test single-walled components by sampling in backfill or to test the primary <br /> containment inside of secondary containment by sampling in the interstitial space_. <br /> Samples are either analyzed on-site with a mobile laboratory or collected on-site and transported to the <br /> MDLeak laboratory for analysis. <br /> Evaluator indicates that the.detectable leak rate can be adjusted by controlling test variables such as <br /> chemical marker concentration and test duration.*** <br /> Calibration of analytical instrumentation is verified daily per EPA published document SW-846,as <br /> referenced in the laboratoryguidance document. <br /> **Manufacturer's water ingress measurement methods have not been evaluated and <br /> therefore cannot be used in California.If the hydrostatic pressure of the component being <br /> tested is less than the exterior hydrostatic pressure,the tankmust be pressurized to a level <br /> above the exterior hydrostatic pressure. <br /> ***This method cannot be used In California for Ieakrates other tharr,0.005 gph because the <br /> third-party evaluation included only 0.005.:gph,leaks. <br /> Leak Detection Technologies,LLC Evaluator:.. Ken Wilcox Associates <br /> 1400 East Paseo Pavon Tel:(816):443-2494 <br /> Tucson,AZ 85718 Date of Evaludti0ni 1/7/2008 <br /> Phone;(520)207.4878 <br /> E-mail: info@LeakDetect.net <br /> URL:www.leakdetect.net <br /> Home(Vendors;A-F I Vendors:G-M I Vendors:N-S I Vendors:T•Z I Method Index <br /> Appearance on this list is not to be construed as an endorsement by any regulatory agency nor is it any guarantee ofthe performance of the <br /> method or equipment <br /> Equipment Should be installed and operated in accordance with all applicable laws and regulations. <br /> For full details,please refer to our expanded"DISCLAIMER"page. <br /> http://www.waterboards.c:a.gov/ust/leak-preventiot)Ag113Nendos Files/leak detection te... 3/1.7/2008 <br />