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JAAHS H. RAY <br /> CIVIL ENGINEER <br /> 2441 Hidden Valley Drive <br /> Santa Rosa. CA 995404 <br /> 7474804115 <br /> NOVEMBER 169 2001 <br /> REVISED: AUGUST 1, 2004 <br /> Tanknology Inc <br /> 8501 N. MoPac Expressway, Suite 400 <br /> Austin, TX 78759 <br /> A.TT : Bract Hoffman <br /> RE : STATE PRVESSIONAI, F,NGINKER 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 SPILT. CONTAINERS, UNDER-DISPENSER <br /> CONTAINMENT AND SUBMERGED TURBINE E PUMP SUMPS WITH <br /> COMPUTERIZED VPLT <br /> I have reviewed and evaluated the following materials for the periodic testing of Spill <br /> Containem/Containment. <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 1. 1344 Tw*aolowywNDE Computeriaed 'VPLT Tosting System, 'Volumewc <br /> Tank Tightness Test Method (Underfill). Evaluator. Ken Wilcox Associates, date <br /> of evaluation 02/15/93 <br /> 5 . Tanknology summary 'V'PLT TESTING SYSTEM Rev. 8/01 /01 <br /> 6. Study by Brad Hoffman, Tan4mology, 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 UnderwDispenser Containment sumps, and 10 minutes <br /> for Spill Containers. <br /> 6a VPLT sysumi sufl.ware is capable ofoperwing with variom ftusholds and test <br /> periods in order to detennine 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 /> he extended and the threshold may be modified as required by customer and/or <br /> PACE 1 of 3 <br />