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Engineers, Inc. 610 16th street, Salta 217 <br /> Oakland, CA 94612 <br /> Tel: (510) 839-9438 <br /> March 29, 1993 Fax:(510) 839-2607 <br /> Indy Electronics <br /> 400 Industrial Park Drive <br /> Manteca, CA 95336 <br /> Attn: Mr. Edward Walker <br /> Facilities Manager <br /> Re: Tank Certification / Structural <br /> MQUAD Waste Treatment System <br /> SEC 93204 <br /> Gentlemen: <br /> This is to certify that the tanks as listed below, and their <br /> supports (after modifications) have sufficient strengths and are <br /> acceptable for the current use of wastewater storage and treatment <br /> in the facility. <br /> NO. TANK VOLUME WALL AND BOTTOM MODIFICATIONS <br /> (S. G. ) THICKNESS, Inches MADE <br /> 1 PH # 1 1, 100 gal 0. 2" - 0. 25" See <br /> (1. 1) Crosslinked Polyolefin Note 1 <br /> 2 PH # 2 1, 100 gal 0. 2" - 0. 25" See <br /> (1. 1) Crosslinked Polyolefin Note 1 <br /> 3 PH # 3 1, 100 gal 0. 2" - 0. 25" See <br /> (1. 1) Crosslinked Polyolefin Note 1 <br /> 4 BACKWASH 1, 100 gal 0. 2" - 0. 25" See <br /> (1. 1) Crosslinked Polyolefin Note 1 <br /> 5 H2SO4 500 gal 0. 2" Crosslinked See <br /> (1. 3) Polyolefin Note 2 <br /> 6 NAOH 500 gal 0. 2" Crosslinked See <br /> (1. 54) Polyolefin Note 2 <br /> 7 EQUALIZATION 51X 101X 101H 1/4" Steel See <br /> (1. 1) Note 2 <br /> 8 COLLECTION 41X 6' X 51H 3/16" Steel See <br /> (1. 1) Note 2 <br /> Notes: 1 . Support Frames are restrengthened and Tanks are <br /> restrained. <br /> 2 . Tanks are restrained. <br /> 1 <br />