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10 0 <br />Harding ESE, Inc. <br />90 Digital Drive <br />Novatc, CA 949�9 <br />Harding ESE <br />A MACTEC CoNipAiv,, Horre page: Corn <br />November 20, 2001 <br />52914 <br />-Mr. Ron Kenyon <br />Delta Tech Service, Inc. <br />397 W. Channel Road <br />Benicia, California 94710 <br />RE: Certification of Portable Wastewater Tanks —TTU 9 DTX -25 <br />Delta Tech Service, Inc., <br />Harding ESE Project Number 52914 <br />Dear lir. Kenyon: <br />Pursuant to our Agreement for professional engineering services, Harding ESE, Inc. (Harding ESE) has <br />completed its assessment of the existing Transportable Treatment Units (TTL} for use in the treatment <br />on Non -Resource Conservation and Recovery Act (Non-RCR.A) hazardous wastes, Harding ESE <br />conducted the inspection of the -f7U's and components at the Delta Tech facility located in Benica <br />California on March 5, 2001. <br />REGUL4 TORYA U7710RITY <br />The engineering assessment certification was completed in accordance with 22 CCR 6626:5.191, which <br />states in part: <br />Tanks shalt have sufficient shell strength and, far closed tanks, pressure controls (e.g., vents) to <br />assure that they do not collapse or rupture. The Department will review the design of the tanks, <br />including the foundation, structural support, seams and pressure controls and seismic <br />considerations. The Department shall require that 47 minimum shell thickness be maintained at <br />all times to ensure sufficient shell strength. Factors to be considered in establishing minimum <br />thickness include the width, height and materials of construction of the tank and the specific <br />gravity of the waste, which will be placed in the tank In reviewing the design oj*the rank and <br />approving a minimum thickness, the Deparrment shall rely upon appropriate industrial design <br />standards and other available o1formation. <br />This assessment shall determine that the tank system is adequately designed and has sufficient <br />structural strength and compatibility with the waste(s) to be transferred, stored or treated, to <br />ensure that it will not collapse, rupture, or fail. At a minimum, this assessment shall consider <br />the following: <br />