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1.3.5.2.SPACING IN STABLE IN-SITU (NATIVE) 1.3.5.2.3.If two or more tanks are installed in the same hole and SOIL CONDITIONS deadmen are used,the space between the tanks must be equal to or 1.3.5.2.1.The minimum spacing between the sidewall or endcap greaterthan two times the width of the deadman or deadmen required of the tank and the side of the excavation must be 18 inches[46 cm]. between the tanks.See Figure 1-2. The space between tanks using our deadmen is typically 36 inches See Figure 13. [91 cm]for 10-foot-and 12-foot-diameter tanks,and 24 inches[60 cm] NOTE:All measurements from the tank sidewalls are to be taken for tanks smaller than 10 feet in diameter. from the outside diameter of the tank ribs. 1.3.5.3.SPACING IN UNSTABLE IN-SITU(NATIVE) 1.3.5.2.2.If two or more tanks are installed in the same hole,allow SOIL CONDITIONS for at least 18 inches[46 cm]between the tanks.In Canada,the National 1.3.5.3.1.We recommend that the tank owner seek the advice of Fire Code of Canada requires 24 inches[60 cm]between a fuel tank and a local foundation professional engineer if the in-situ soil is soft or another tank or structure.See Figure 1-3. inherently unstable(for example,peat,quick-sand,muck,landfill,soft Figure 1-3 or highly expansive clay,underground stream,etc.),as further described in point 1.3.5.3.2. III I 1.3.5.3.2.The excavation mustallow a minimum space equal to 112 the diameter of the tank between Ell the excavation wall and both the side and the endcap of the tank to enhance lateral resistance(see Figure 1-3), IIIII if one of the following criteria is met: • the soil is cohesive soil that is less than 750 lbs./sq.ft. IIIII [35.9 kPa]as calculated from an unconfined compression =18" 18" 18" test OR IIIII[60 [60 [60 • the soil has an ultimate bearing capacity of less than IIIII cm] cm] cm] 3,500 lbs./sq.ft.[167.6 kPa] 1.3.5.3.3.Stabilizing materials,such as a reinforced concrete IIIII slab,may be required under the tank as a foundation in addition 18"[60 cm] to the required 12-inch[30-cm]bedding in an excavation where 18"[60 cm IIIII ] the bottom is unstable. IIIII=IIIII-IIIII-IIIII=IIIII-IIIII=IIIII-IIIII-IIIII=IIIII-IIIII-11 IIIII- Stable Soil =IIIII=IIIII=IIIII-IIIII=IIIII-IIIII 1.3.5.3.4.The spacing between adjacent tanks is to be at least IIIII-III III-IIIII-IIIII-IIIII—IIIII-IIIII-IIIII-IIIII=IIIII-IIIII-11 18 inches[46 cm].In Canada,the National Fire Code of Canada requires 24 inches[60 cm]between a fuel tank and another M 111 tank or structure.See Figure 1-3. I 1.3.5.3.5.If deadmen are used,follow the spacing requirements between the tanks given in points 1.3.5.2.2 IIIII and 1.3.5.2.3. IIIII 1.3.6.ADDING TANKS AT EXISTING LOCATIONS IIIII 1.3.6.1.GENERAL V2Tank 18" 1.3.6.1.1.Additional tanks may be installed at existing locations IIIII Diameter [60 if proper foundation support exists. IIIII 1.3.6.1.2.Backfill support around the existing tanks must not be disturbed. IIIII 1.3.6.1.3.It is the responsibility of the tank owner to choose IIIII /zTank �/z Tank the method of installation. Diameter Diameter 1.3.6.1.4.We recommend that one of the following methods II III be used. IIIII-IIIII-IIIII=IIIII-IIIII-IIIII-IIIII-IIIII-IIIII-IIIII-IIIII=11 IIIII- Unstable Soil wilig 11111M IN11111 111111MI111111 111111 111111M 111111= II-IIIII 08