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JAMES H. RAY <br /> CIVIL ENGINEER. <br /> 2041 Ridder Valley Drive <br /> Santa Rosa. CA 995404 <br /> 7074804113 <br /> NOVEMBER 16, 2001 <br /> REVISED: AUGUST 1, 2005 <br /> Tanknology Inc <br /> 8501 N. MoPac Expressway, Suite 400 <br /> Ausl7in, T71; 78759 <br /> ATT: Brad Roffman <br /> RE : STATE p' VVISSIONAL F�NG NEER APPROV'A'L. <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 ST313MZRGED TURBINE PUMP SUMPS WITH <br /> COMPUTERIZED VPLT <br /> 1 have reviewed and evaluated the following materials for the periodic testing of Spill <br /> Containers/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, 1993 . <br /> 4. LG 113- 14 TankcxoleUm IDE Ceinputoriaed VPLT Testing Systcm, `VolumeUh, <br /> Tank Tightness Test Method (Underfiill). Evaluator: Ken Wilcox Associates, date <br /> of evaluation 02/15/93 <br /> 5 . Tanknology summary VPLT TESTING S'Y'STEM Rev. 8/01 /01 <br /> 6. Study by Brad HofiEman, 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, l5 minutes for Under-Dispenser Containment sumps, and 10 minutes <br /> for Spill Containers . <br /> 6a. VPLT sysleui suli,wam is capable ofoper4ting wi (h vanh) us lhrusholds 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 oliange is 0.05gph. The test period may <br /> be extended and the threshold may be modified as required by customer and/or <br /> PACE 1 of 3 <br />