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JAMES K RAY <br /> CIVIL ENGINEER <br /> 2041 Hidden Valley Drive <br /> Santa Rosa. CA 995404 <br /> 7074804115 <br /> NOVEMBER 169 2001 <br /> REVISED: AUGUST 1, 2005 <br /> Tanknology Inc <br /> 8501 N. MoPac Expressway, Suite 400 <br /> Austin, TX 75759 <br /> ATT : Brad Roffman <br /> RE : STATE PRVESSIONAI, FNGTNEER APPROVAL <br /> CHAPTER 6.7 H&SC, SECTION 2635(b) <br /> CCR Title 23, Division 23, Chapter 16, Section 2635 (b) <br /> PERIODIC TESTING OF SPILL CONTAINERS, UNDER-DISPENSER <br /> coNT.A.INmENT AND SUBMERGED TURBINE PUMP SUMPS WITH <br /> COMPUTERIZED VPLT <br /> 7 have reviewed and evaluated the following materials for the periodic testing of Spi11 <br /> Containems/Cnntainment. <br /> 1 . CCR Title 23 , Division 3 , Chapter 16, Underground Tank Regulations. <br /> 2. Chapter 6.7 H & S Code, Underground Storage of Hazardous Substances . <br /> 3 . Evaluation of the VPLT Underflll Tank Tightness Testing System prepared for <br /> NDE Environmental Corporation by Ken Wilcox Associates, Inc., Blue Springs, <br /> Mo, dated March 30, 1993 . <br /> 4. LG 11344 Ta�wvlogy-S'�DE Computcriaed. VPLT Tcsting Syswm ` olunieuic, <br /> Tank Tightness Test Method (Underfill). Evaluator: Ken Wilcox Associates, date <br /> of evaluation 02/ 15/03 <br /> 5 . Tanknology summary Mf TESTING S'Y'STEM Rev.8/01 /01 <br /> f. Study by Brad Hoffinan, Tanknology, comparing VPLT test times for <br /> underground storage tanks and various sumps based on volume, time and surface <br /> area. parameters. The minimum test times are 30 minutes for STP sumps and large <br /> fill sump, 15 minutes for Under-Dispenser Containment sumps, and 10 minutes <br /> for Spill Containers. <br /> 6a VPLT system software is capable of operating with various thresholds and test <br /> periods in order to determine the pass/fail rate. The minimum standard test period <br /> is 10 minutes and the maximum volume change is 0 .05gph. The test period may <br /> be extended and the threshold may be modified as required by customer and/or <br /> PAGE 1 of 3 <br />