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93/6:!.(!193 23:88 blUo4nbiy <br /> SLAKEY AND ASSOCIATES <br /> SA Environmental and Process Consultants <br /> Engineering Systems & Equipment <br /> P.O. BOX 944-375 VILLAGE SOUARE-ORINOA,CALIFORNIA 94M <br /> PHONE:(510)254-4164 •FAX:(510)2544679 <br /> March 3, 1993 <br /> Mr. Ted Cooper <br /> RM - Holz Inc. <br /> 1129 South Sacramento Street <br /> Lodi, CA 55241 <br /> Re: Tank P.E. 25 <br /> Tank Inspection Per Section <br /> 66264.191, Title 22 <br /> Dear Mr. Cooper: <br /> At your request we have made an inspection of the above referenced tank at <br /> your Lodi facility. <br /> TANK USE <br /> The tank is used for neutralization service on an intermittent basis. Waste liquor <br /> (NaOH) from the metal cleaning operation is transferred to this tank by pump and <br /> is neutralized by adjusting the pH. The liquor is then discharged by gravity to the <br /> local Industrial sewer. The tank is empty most of the time. <br /> TANK PHYSICAL CHARACTERISTICS <br /> The tank Is located on a concrete pad adjacent to the metal cleaning tanks. The <br /> tank is a rectangular, metal vessel with double wall construction and a flat, single <br /> thickness bottom. It is of all welded construction. The tank is fabricated from <br /> stainless steel plate ( except for the loose top which Is mild steel). The sides are <br /> 3" thick, with a 10 gauge inner wall surface and with a 16 or 18 gauge outer <br /> cladding. The wall framing appears to be mild steel and the walls may be <br /> Insulated ( the interior spaces were not available for inspection). The floor is a <br /> single 1/4" plate welded to the Interior walls. There are two 3x3xl/4 angle <br /> stiffeners welded to the walls at the third po!nts spanning the bottom. <br /> The tank sits approximately 9" above the concrete slab. It Is supported by 3"x3" <br /> structural steel tube legs located at each corner. These legs are actually <br /> extensions of the steel Framing for the tank. They rest on 6x6x1/4 mild steel base <br /> plates. The 3" angle bottom stiffeners are not sufficient to carry the full tank ( of <br /> water) without structural deformation of the floor plate. Our Inspection noted that <br /> the bottom plate had been over stressed and this condition has been corrected <br /> by the addition of a structural tubing leg at the center of each stiffener. These are <br /> 3x2x1/4 tubes set on 8x8x3/8 base plates. These additional bottom supports <br /> effectively reduce the stress on both the floor plate and the angles to acceptable <br /> loadings. A visual and dye penetrate check was made of the Interior floor to wall <br />