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SEC Engineers, Inc. <br /> 610 16th Street,Suite 217,Oakland, CA 94612 <br /> (415)839.9438 <br /> FAX(415)839-2607 <br /> July 7 , 1992 <br /> Indy Electronics <br /> 400 Industrial Park Drive <br /> Manteca, CA 95336 <br /> Attn: Mr. William Price, Safety/Environmental Specialist <br /> Re: Tank Certification / Structural <br /> Gentlemen: <br /> This is to certify that the tanks as listed below, and their <br /> supports ( after modifications) have sufficient strengths for the <br /> current use for wastewater storage and treatment. <br /> NO. TANK VOLUME WALL AND BOTTOM MODIFICATIONS <br /> (GAL) THICKNESS MADE <br /> 1 THICKENER 3, 000 1/4" STEEL YES <br /> 2 CLARIFIER 5 ,000 1/4" STEEL YES <br /> 3 FLOCCULATOR 2 ,500 1/4" STEEL YES <br /> 4 MAIN HOLDING 4, 500 1/4" STEEL YES <br /> 5 AUX. HOLDING 4, 500 1/4" STEEL YES <br /> 6 INTERCEPTOR ACID 540 1/2" POLYETHYLENE NO <br /> The above conclusion is made based on our structural assessments <br /> report, dated 6/1/92 . The report has recommended that all tank <br /> supports , except Tank NO. 6 , be restrengthened to resist the <br /> seismic loads as required in 1991 UBC. It is also based on our <br /> final inspection after the construction for the modifications <br /> completed on 6/23/92 . <br /> If you have any questions regarding the above, please feel free <br /> to call us. <br /> Sincerely, <br /> J <br /> Long I . Tzeng, S.E . <br /> LT/kt <br /> Enclosures : Structural Assessment Report, dated 6/1/92; <br /> Modification Plans , Sheets A-1 , S-1 to S-8; and <br /> Structural Calculations <br />