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FEB. -02' 98(MON) 11 :50 ISE LABS TEL:20923948R1 P. 00, <br /> Engineers, Inc. <br /> 610 16th Street.Suite 217,Oakland,U 94612 <br /> (415)879-9436 <br /> FAX(415)679.2607 <br /> :uly 7 , 1992 <br /> i <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 =auks 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 MODIFICATTONS <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 21500 1/4" STEEL YES <br /> 4 MAIN HOLDING 4 , 500 1/4" STEEL YES <br /> 5 AUX. HOLDING 4 , 500 1/411 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 LBC. . 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 /> Long I . Tcenq, S .E . <br /> LT/kt t4PyF� <br /> Enclosures : Structural Assessment Report, dated 6/1/92; <br /> Modification Plans, Sheets A-1 , S-1 to S-2; and <br /> structural Calculations <br />