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03/02/t993 23: 08 5102540579 ""- Mr. Ted Cooper RM - Holz Inc. March 3, 1993 Page 2 weld joint for cracking or deformation. The welds were noted as satisfactory at the time of the inspection. The tank is approximately 5'-0"x8'-0"x6'-0" deep and has a flush full capacity of 240 cu. ft. ( approximately 1,700 gallons). There are two fill pipes discharging into the tank through holes cut in the top sheet. The discharge line (2") is welded Into the floor plate and has a ball valve for shutoff located at the edge of the tank. This ball valve has a keyed lock attached to it so that unauthorized discharge can not occur. There is a compressed air sparging line located in the tank for mixing and aeration. The line to the sparger enters the tank vertically from the top so that back siphoning will not occur. The age of the tank is unknown, TANK INTEGRITY The tank has been analyzed for stability under seismic zone 3 requirements of the 1988 UBC. The tank, and its supports, meet or exceed the loading requirements at this time. The tank is stable against horizontal seismic forces without anchoring to the slab. RECOMMENDATIONS The top plate is fabricated from mild steel, At some time in the future it may be prudent to replace the top with a stainless material to reduce the corrosion potential. No overflow control or drain has been provided. Consideration should be given to adding either an overflow capable of handling the maximum fill rate, or a level sensor arranged to shut off the feed. CLOSURE Because of the material being handled, the tank may require secondary containment under Section 66264.193 of Title 22. We have not reviewed this consideration other than to note that curbing around the tank pad, which could serve as secondary containment, Is badly cracked and is needing repair. The tank may be exempt under subsection (g) or other subsections of this Section. This should be reviewed by the engineer and the operator to assure continuing compliance with the provisions of Title 22. Our review of the tank has determined that as of March 3, 1993, this tank was in compliance with the intent of Section 66264.191 of Title 22.