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1.3.1.5.For additional requirements and specifications,consult all 1.3.2.6.The tank must not fall within the"shadow"of the 45-degree codesand regulations of governmental agencies.Seethe Introduction angle line drawn from the foundation's footing.See Figure 1-1.If the for additional information. tank would fall within this"shadow;'do one of the following to ensure 1.3.2.EXCAVATION AND TANK LOCATION that the tank does notfall within the"shadow": • move the tank awayfrom the existing building 1.3.2.I.Werecommend that the tank ownerseekthe advice • move the foundation of the building to be constructed away from the tank of a local foundation professional engineer to determine the proper • deepen the footing of the planned building's foundation placement of a tank excavation near any existing structu re(s). 1,3.3.DEPTH OF EXCAVATION NOTICE 1.3.3.1.Typically,the depth of the excavation is determined by: Improper placementof the excavation could result in damage . groundwater conditions to the tank and/or property damage. • traffic at the site 1.3.2.2.The tank owner and/or the owner's technical representative is • soft or uneven excavation base responsible for determining the proper placement of a tank excavation. • pipeline grade requirements and/or invert elevations 1.3.2.3.In general terms,the size of the excavation is determined by: • codes and regulations • the number of tanks to be installed 1.3.3.2.Groundwater must be considered if the level of water • the size of the tanks to be installed in the ground may rise above the bottom of the tank at anytime 1.3.2.4.The location of a tank can be affected by the location during the life of the tank. of nearby structures.When selecting a tank site,care must betaken 1.3.3.3.Traffic loads are considered to be loadings for highway to avoid undermining the foundations of existing structures or new vehicles up to H-20 or HS-20 as defined in the AASHTO Standard buildings to be constructed.See Figure 1.1. Specifications for Highway Bridges. • Ensure that downward forces from loads carried by the foundations 1.3.3.4.Excavations must allow for 12 inches[30 cm] and supports of nearby structures(constructed before or after tank of backfill between the bottom of the tank and the bottom installation)are not transmitted to the tanks. of the excavation or the top of the anchor slab(or any other stabilizing materials used). 1.3.3.5.If either an anchorslab or other stabilizing material is used, Footing allow additional depth in the excavation to accommodate their construction. 1.3.3.6.Typically,no additional depth of bedding is required for the use of a deadman anchoring system. IIIII IIII IIII=IIIII 1.3.4.DEPTH OF COVER IIII-IIII 1111111111A CAUTION Shadow of III = III—VIIIFFFI In both traffic and nontraffic installations,no truck or equipment 45°Angle VIII—VIII IIIII—VIII loads are allowed overthe tank until the backfill is at least at —VIII—IIII IIII=IIIII the depth of coverspecified in Table 1.1 or Table 1.2,whichever 11111 HIM_ —IIIII isapplicable.Failure to follow this caution could resultin minor _ or moderate injury,and/or damage to the tank. =IIIIIEd IIIII 1.3.4.1.We recommend that every site be thoroughly evaluated IIIII— =IIIII forthe potential of a rise in the local watertable or of trapped water = (a wet-hole condition).Sufficient overburden andlor an appropriate Tank anchoring system must be present to offset buoyancy of the tank in such conditions. NOTICE Failure to provide sufficient overburden and/or an appropriate anchoring system could cause tank failure,or could result in damage to the tank and/or surrounding property. 1.3.4.2.The tank owner or the owner's technical representative is responsible for determining sufficient overburden and/or appropriate 1.3.2.5.Typically,the way to check the placement of the tank anchoring system. in relationship to a nearby structure is to do the following: 1.3.4.3.The minimum depths of cover dimensions given here • determine the depth of burial needed forthe tank are importantto the successful installation of a tank.They may • locate the footing of the structure to be considered not be sufficient to counteract buoyancy in wet-hole conditions. • determine the line thatwould fall into the ground from a45-degree angle drawn downward from thecorner(s) 1.3.4.4.Additional depths of cover may be necessary due to safety of the footing of the foundation that is closestto the tank requirements or operational requirements by governmental agencies. 06 I: PLANNING FOR INSTALLATION