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JAMES H. RAS' <br /> CIVIL ENGINEER <br /> 2041 Hidden Valley Drive <br /> Santa Rosa. CA 995404 <br /> 707-480-8115 <br /> NOVEMBER 16,2001 <br /> REVISED: AUGUST 1,2005 <br /> Tanknology Inc <br /> 8501 N.MOPac Expressway,Suite 400 <br /> Austen,TX 75759 <br /> ATT; Brad Hoffman <br /> RE! STATE PRFia:S'STONAL ENGINEER 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 /> CONTAINMENT AND SUBMERGED TURBINE PUMP,SUMPS WITH <br /> COMPUTERI.ZT+D VPLT <br /> T have reviewed and evaluated the following materials for the periodic testing of Spill <br /> Containem/C:nntainment_ <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 Underfill Tank Tightness Testing System prepared for <br /> NDE Environmental Corporation by Ken Wilcox Associates, Inc., Blue Springs, <br /> Mo,dated March 30, 1.993. <br /> 4. LO 113-14 TankaoloWy NDE Computerized'V'PLT Tcstuig Systvai, vohumeuic <br /> Tank Tightness Test Method(Underfill). Evaluator: Ken Wilcox Associates, date <br /> of evaluation 02/15/93 <br /> 5. Tanknology summary'V'PLT TESTING S'Y'STEM Rev.8/01/01 <br /> 6. Study by Brad Hoffman,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 /> F11 sump, 15 minutes for Under-Dispenser Containment sumps, and 10 minutes <br /> for Spill Containers. <br /> 6a VPLT system suflwum is capable of operating with various lhresholdi-and lest <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.O5gph. 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 />