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NSTALLATION PROCEDURES FOR UNOEROROUNO STORAOE TANK <br /> OLASTEELL'^ BED AND BACKFILL : <br /> ALL EXCAVATED NATIVE SOIL MUST BE REPLACED WITH APPROVED BACKFILL . DO <br /> NOT BACKFILL IN LAYERS USING DIFPjRENT MATERIALS. <br /> APPROVED BACKPILL MATERIALS ARE: <br /> 1 . CLEAN WA7HE0 SAND <br /> 2 . ORAVEL <br /> A CLEAN. NATURALLY ROUNDED AGGREGATE WITH A MIX OF PARTICLE SIZES NOI <br /> LESS THAN 1 /4' NOR MORE THAN 3/4' IS REQUIRED. THIS MATERIAL IB <br /> COMMONLY CALLED PEA ORAVEL. <br /> 3. STONE OR GRAVEL CRVSMINOS <br /> WASHED STONE OR GRAVEL CRUSHING$ WITH ANOULAR PARTICLE SIZE NOT LE33 <br /> THAN I /S' NOR MORE THAN 1 /4' IS REQUIRED. <br /> TEST PROCEDURE FOR JACKETSO TANKS AT JOBSITE WHILE TANK .I $ <br /> EMPTY : <br /> 1 . IF OUTER TANK MAINTAINS AT LEAST 3. 3 IN. HO. OF VACUUM FOR ONE HOUR <br /> MOTH THE INNER - TANK AND OUTER TANK MAY SE CONSIDERED PROPERLY <br /> TESTED. <br /> 2 . INTERSITIAL SPACE TO SQ VACUUM TESTED ONLY. <br /> NOTE: MODERN WELDING COMPANY DOES NOT RECOMMEND HOLIDAY TESTING FOR. <br /> OLASTt=EL 11 TANKS. <br /> TANK HANDLINdt <br /> UNDEROROUND TANK(S) ARE SUPPLIED WITH EITHER ONE- OR TWO INSTALLED LIFTING <br /> LUGS. DEPENDENT ON TANK SIZE. REPER TO SPECIFIC TANK DRAWING TO DETERMINE <br /> THE EMPTY LIFTING WEIGHT OF THE. TANK. BEE .*FINISHING INSTRUCTIONS . - ITEM <br /> NUMBER 71 FOR APPLICATION OF LIFTING LUO COVERS TO 'GLAQTEEL' TANKS PRIOR. TC <br /> SACKFILLINO OR COVERING THE TANK. - - <br /> DO NOT DROPt0R ROLL TANK($) PROM TRUCK INTO EXCAVATED OPENING. <br /> LIFTINO PROCEDURES : ! <br /> 0' AAX I ALI^ ' <br /> SECONDARY TANK BO� AINIALIA <br /> bi --------------------------------------- <br /> I <br /> I'w*`PRIAARY TANK <br /> 1 I <br /> i I <br /> 1 1 <br /> I � ' <br /> THESE INSTALLATION INSTRUCTIONS TAKE PRECEDENCE OVER ACT 100 INSTRUCTIONS <br /> IN ANY AREA OF DIPFERBNCE. - <br /> PAGE 2 OF 2 <br />