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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 codes and regulations of governmental agencies.See the 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 not fall within the"shadow": • move the tank away from the existing building 1.3.2.1.We recommend that the tank owner seek the 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 structure(s). 1.3.3.DEPTH OF EXCAVATION NOTICE 1.3.3.1.Typically,the depth of the excavation is determined by: Improper placement of 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 any time 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 be taken 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 Figure 1-1 other stabilizing materials used). 1.3.3.5.If either an anchor slab or other stabilizing material is used, Footing allow additional depth in the excavation to accommodate their construction. f 1.3.3.6.Typically,no additional depth of bedding is required for the use of a deadman anchoring system. IIIII-IIII IIIII=IIIII 1.3.4.DEPTH OF COVER IIII=IIIII IIIII- IIII A CAUTION Shadow of —IIIII=IIII IIIII=IIIII In both traffic and nontraffic installations,no truck or equipment 45°Angle IIIII—IIIII IIIII—IIIII loads are allowed over the tank until the backfill is at least at — IIIII—IIII IIIII—IIIII the depth of cover specified in Table 1-1 or Table 1-2,whichever IIIII—III IIII—IIIII is applicable.Failure to follow this caution could result in minor _ or moderate injury,and/or damage to the tank. =IIIII IIIII 1.3.4.1.We recommend that every site be thoroughly evaluated IIIII— =IIIII for the potential of a rise in the local water table or of trapped water (a wet-hole condition).Sufficient overburden and/or 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 w 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 important to 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 that would fall into the ground from a 45-degree angle drawn downward from the corner(s) 1.3.4.4.Additional depths of cover may be necessary due to safety of the footing of the foundation that is closest to the tank requirements or operational requirements by governmental agencies. 06