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LI <br />November 20, 2001 <br />52914 <br />\Mr. Ron Kenyon <br />Delta Tech Smice, Inc. <br />Page 3 <br />Harding ESE conducted a visual integrity assessment of fourteen (14) TTU tanks. Nine of these tanks <br />have a total capacity of 6,500 gallons and five of the tanks have a capacity of 4,500 gallons. <br />A summary of the I`CU's inspected is detailed below: <br />Tank Number Serial Number In Service Date Size/Double Containment <br />DC I01 <br />NN 1092B/DC 101 C93-01036 <br />3/15192 <br />6500 / Yes <br />DC 103 <br />NUM1092/DCC9300569 <br />3/15/92 <br />6500 / Yes <br />DC 112 <br />B 1402921DC 1 12C 170892 B <br />6/1 -5/92 <br />65001 Yes <br />DC 131 <br />8992A/8991 C <br />9/01/99 <br />6500/ Yes <br />DC 132 <br />8992A/8992C <br />9/01/99 <br />6500 / Yes <br />DC 133 <br />8992A/8993C <br />9/0 U99 <br />6500/ Yes <br />DC 134 <br />8992A/8994C <br />9/0 U99 <br />6500/ Yes <br />DC 135 <br />8992A/8995C <br />9/01/99 <br />6500 / Yes <br />DC 136 <br />8992A/8996C <br />9/01/99 <br />6.500 / Yes <br />DC4503 <br />104EI2959B/05Ki2956A <br />12/95 <br />4500/ Yes <br />DC4504 <br />104E12955B/05K12952A <br />12195 <br />4500 / Yes <br />DC4505 <br />104E12954B/05K1195IA <br />12/95 <br />4500 / Yes <br />DC4506 <br />104E12953B/05K1295IA <br />12/95 <br />45001 Yes <br />DC4507 <br />104E12959B/05KI1953A <br />12/95 <br />4500/Yes <br />The TTU and components appear to have been designed and constructed in accordance with applicable <br />standards and are suitable for use with a wide variety of chemicals at low temperatures. All tanks and <br />piping in direct contact are either constructed of polyethylene, stainless steel, or carbon steel lined with <br />hypalon. <br />Secondary containment for the TTU's consists of a 10 -inch high perimeter berm around the TTU and a <br />continuous polyethylene liner. The liner appears to be thick enough to resist punctures under normal <br />use. The containment basin is constructed to allow for 110% of the capacity of the largest tank located <br />in it. Typical construction details of the tank are attached. <br />Based upon Harding ESE's review of the specifications provided by the Central California Container <br />klanufacturing Company regarding the polyethylene tank- and inspection of the DTX -25 TTU systems, <br />the foundation, structural support, seams and connections have sufficient structural strength for use as a <br />wastewater holding tank, is acceptable for transferring, storing, and treating of hazardous waste, and that <br />the tank is unlikely to collapse, rupture or fail. <br />Hardin- ESE <br />;-V <br />