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i 1. EXCAVATION SIZE: s WARNING: DETERMINE THE LOCATION OF OVE-UMAD AND UNDERGROUWD UTILITIES BEFORE EXCAVATING. * THE EXCAVATION SHOULD PROVIDE ADEQUATE SPACE FOR THE TANKS, PIPING, AND ASSOCIATED EQUIPMENT, AND FOR THE PLACEMENT AND COMPACTION OF BACKFILL MATERIALS , PARTICULARLY UNDER THE CIRCUMFERENCE OF THE TANK SHELL AND FINDS . THE SLOPE OF EXCAVATION WALLS IS DETERMINED BY SOIL COADITIONS , DEPTH OF THE EXCAVATION AND , IF WORKERS ARE REQUIRED TO ENTER THE EXCAVATION, SAFETY CONSIDERATIONS . * SIZES STATED ARE MINIMUMS REQUIRED FOR PROPER TANK INSTALLATION . LOCAL , STATE , AND FEDERAL REGULATIONS MAY REQUIRE LARGER EXCAVATION . * EXCAVATION FOR UNDERGROUND TANKS SHOULD BE MADE WITH DUE CARE TO AVOID UNDERMINING FOUNDATIONS OF EXISTING STRUCTURES . DISTANCE BETWEEN TANKS AND STRUCTURES !MUST ASSURE THAT DOWNWARD FORCES FROM LOADS CARRIED BY THE FOUNDATIONS AND SUPPORTS C*� NOT BE TRANSMITTED TO THE TANKS . * HE EXC3rVAT IZN ' SIZE SHALL EXTEND A MINIMUM DISTANCE OF 12" r1R0E D �TIH -ERIMETER OF THE TANK. EXC.` yVA NS, WHERE 7,40 OR MORE TANKS WILL BE INSTALLED t?TQUIRE • 441 � OF 12" BETWEEN TANKS . EXCATI�N DEPTH SHALL BE SUFFICIENT FOR BEDDING AND COVER AS DET INQ D BY N . F. P .A. 30 AND 31 , LOCAL , STATE, AND FEDERAL CODES 'L L OWNER' $tENGINEER. * • FOR BAF DEPTHS *X EDING V -0 , CONSULT WITH A TRUSCO • /�i REPRESEN, VE PR IO _WINSTALLATION. * THE TOT DEPTH' OF THE K EXCAVATION IS DETERMINED BY THE TANK DIAX r t :. EDIDING TH CKNESS, HOLD DOWN PAD ( IF REQUIRED) , • DEPTH OE'4t AND SLOPE OF PIPING. MUCH OF THE TANK' S * SUPPORT -I�`. LVED FROM COMPACTED BACKFILL MATERIAL, WHICH ® PERMITS TH NWARD FORCES PRESENT TO BE DISSIPATED UNIFORMLY OVER A LARG EA. 2 . EXCAVATION PREPARATION: * THE EXCAVA ON SHALL BE FREE FROM ROCKS OR DEBRIS LARGER THAN THE APPROVED BEDDING OR BACKFILL MATERIALS . DAMAGE TO THE F . R. P . SECONDARY 'CONTAINMENT I'ROM MATERIALS SUCH AS ROCKS OR DEBRIS WILL VOID THE WARRANTY. 2 rev . 7/ 13/90