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i <br /> S E CC Engineers, Inc. <br /> 610 16th Street, Suite 217, Oakland, CA 94612 <br /> (415)839-9438 <br /> FAX(415)839-2607 <br /> June 1 , 1992 a <br /> Indy Electronics <br /> 400 Industrial Park Drive <br /> Manteca, CA 95336 <br /> Attn: Mr. William Price, Safety/Environmental Specialist <br /> Re : Tank Modifications for Certification <br /> Gentlemen: <br /> This is the structural assessments report of the existing steel <br /> and polyethylene tanks which are currently used for storage and <br /> treatment of industrial liquid waste by Indy Electronics at its <br /> Manteca Facility. This report does not include a compatibility <br /> assessment of wastes with tank materials , nor does an assessment <br /> of the secondary containment . <br /> The structural assessments are to examine the strengths of the <br /> tank walls, bottoms and stiffeners, and the adequacy of tank <br /> supports and anchorage , for a total of six existing tanks . <br /> According to the 03/26/92 conversation with you, these tanks were <br /> installed in 1989 . The assessments are based on the requirements <br /> of Section 2338 of 1991 UBC for seismic loading. <br /> According to the memo, dated 04/10/92 , the chemicals to be mixed <br /> with water for the treatment have the specific gravities of 1 . 52 <br /> and 1 . 84 . In the 04/13/92 phone discussion with you, we have <br /> agreed that an estimated average specific gravity of 1 . 3 may be <br /> used for structural analysis for the liquid stored in all tanks . <br /> A list of the tank volume, material and the findings of the <br /> structural analyses are summarized as follows : E <br /> NO. TANK IVOLUME1 MATERIAL IMODIFICATION REQUIRED <br /> _ <br /> (GAL) <br /> SUPPORTS ANCHORAGE t <br /> 1 THICKENER 3 , 000 STEEL YES YES <br /> I <br /> 2 CLARIFIER 5 , 000 STEEL YES YES ) <br /> * <br /> 3 FLOCCULATOR 2 , 500 STEEL YES YES <br /> 4 MAIN HOLDING 4 , 500 STEEL NO YES <br /> 5 AUX. HOLDING 4 , 500 STEEL NO YES <br /> 16INTERCEPTOR ACIDI 540IPOLYETHYLENEI NO I NO I� INTERCEPTOR ACIDI 540IPOLYETHYLENEI NO I NO <br /> * Modifications for connections only <br />