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<br /> Step 1—Determine Need for Buoyancy Control AVTable 1:Maximum Allowable Subsurface
<br /> Required information:the maximum height of water outsi the tank and above the tank bottom AND Water Elevation
<br /> the depth of soil cover above the tank top.Tank buoys control may be required if the water level
<br /> outside the-tanlchas the-potentiarto-rise 30 inche 0 mm)or more above th bot om ofth k,
<br /> AND less than 12 inches(300 mm)of soil c is to be placed as backfill over the tank top°Otherwise, verllcel fytstance soMe
<br /> 9owabie taterE�'ev>aeon Outside at Tank•'
<br /> no buoyancy control is required.,
<br /> Tank.R4odei A=From1opofTank, B Tankallselb
<br /> Allowable Subsurface Water Elevation IM-Series' 13"(330 mm) 43"(1,075 mm)
<br /> Groundwater elevation,groundwater table,and water table are terms for the subsurface condition
<br /> where water is held in the subsurface soil pores or rock.The seasonal high groundwater elevation TW-Series= 11"(280.mm) 39"(975 mm)
<br /> represents the highest point the water table has the potential to reach at any time of the year,and
<br /> is not necessarily the level at which groundwater may be observed seeping from the soil at the time 1.IM-Series tanks include the IM-540,IM-1060
<br /> of tank installation.In general,a qualified soil evaluator or engineer can estimate the seasonal high and IM-1530.
<br /> groundwater elevation from careful examination of the soil profile. • 2.TW-Series tanks include the TW-1250 and TW-1500.
<br /> Under certain conditions,a perched water table may be present in the subsurface.A perched water
<br /> table occurs where there is an impermeable or low-permeability soil that causes water to be present
<br /> in the soil pores above the main water table.A perched water table elevation may exceed the seasonal Figure 1:Water Elevation
<br /> high elevation of the main water table.The vertical position of the tank must account for both the
<br /> seasonal high groundwater table and any existing or future perched water table condition.Verify that
<br /> the subsurface water level will not exceed the height of the outlet pipe saddle of the tank,as 18"(450 mm)Or Less.Soil Backfill Above Tank Top
<br /> show in Tables 1 and 2,and Figure 1.
<br /> Table 2 Instructions Top of Tank
<br /> 1. In the left-hand column of Table 2,locate the row corresponding to the height of the water elevation �i n`N A(Table 1)
<br /> outside the tank and above the tank bottom(Parameter I)for the site conditions.See Figure 2. ——t !"I =`
<br /> 2.Follow that row to the right until reaching the column corresponding to the depth of soil cover proposed Seasonal HighWig I
<br /> above the tank top(Parameter II).See Figure 2. Groundwater'(600 Higher l B(Table
<br /> Thano 2T"(600 mm) 1)
<br /> 3. If the tank model is described in that cell,then buoyancy control is required as described for the tank Above Tank Bottom
<br /> (proceed to Step 2).If the tank model is not listed in that cell,then no buoyancy control is required. ItKM
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<br /> 4.The tank shall not be installed where the water level outside the tank exceeds the height of the outlet Maximum Allowable Tank Base
<br /> pipe saddle.Follow guidelines in Tables 1 and 2. Water Position
<br /> Table 2:Infiltrator tank models' and conditions requiring buoyancy control • Corresponds e nt rtrtlet
<br /> 3 ; T Y PipeSaddle Invert
<br /> Parameter II Soil cover depth above tank top'
<br /> Parameter i ,
<br /> Water height above,tankbottom
<br /> Figure 2: Buoyancy Control Parameters
<br /> .
<br /> 6 in(150 mm)to Above 12 in
<br /> 12 in(300 mm) (300mm) Parameter II
<br /> Depth Of Soil Cover
<br /> t �i(kbove outlet pipe saddle 3` Do not install Do not install Above Top Of Tank
<br /> (900 mm)to outlet pipe saddle 0:, ,, All models None
<br /> All models except IM-
<br /> 3 30"(750 mm)to 36"(900 mm)' None
<br /> 540 and IM-1060 # Arlin
<br /> tit
<br /> 4 L,eliathen30". mm) "Ve, .`' None None Parameter rtt
<br /> Water Height
<br /> Above Tan Bottom:
<br /> NOTES:
<br /> sandS�=- ..d
<br /> 1.Infiltrator tank models include:IM-540,IM-1060,TW-1250,TW-1500 and IM-1530.
<br /> 2.Water height corresponds to seasonal high groundwater elevation or perched water elevation measured from bottom-of-tank elevation.
<br /> 3.Minimum 6 inches soil cover backfill required above all Infiltrator tanks.
<br /> 4.The tank shall not be installed where the water level outside the tank exceeds the height of the outlet pipe saddle.Follow Table 1 guidelines.
<br /> Design Example
<br /> A contractor plans to install an IM-1060 tank where the water level outside the tank Table 2:Infiltrator tank models and conditions requiring
<br /> has the potential to rise to 37 inches(940 mm)above the tank bottom(Parameter I), buoyancy control
<br /> and the design plan calls for 8 inches(200 mm)of soil cover above the top of the tank
<br /> Parameter ll:Soil cover depth above tank top(Parameter II)° In Step 1,Table 2,a 37-inch(940-mm)exterior water height corresponds -
<br /> to row 2(36 inches[900 mm]to outlet pipe saddle)under Parameter 1. The 8-inch w t,�ghtay.tankuatmm e
<br /> (200-mm)soil cover corresponds to column A(6 inches[150 mm]to 12 inches[300 mm]) " sa ' +sttt Above 12)n'
<br /> (300 mm)
<br /> under Parameter II in Table 2. At the intersection of Parameter I,row 2 and Parameter
<br /> II,column A,Cell 2A indicates"All models",meaning all tank models,including the 1 Abov autietpipoead , „ ¢ g Do not install
<br /> IM=1060,require buoyancy control under these conditions Referring to Step 2,Table 3, %'
<br /> under the IM-1060 heading,Case 1-would apply for 37 inches(940 mm)of water above z' " tom'
<br /> 2�. Alt models, None the bottom of tank and 8 inches(200 mm)of soil cover. Available options are as follows .
<br /> o -
<br /> (see specific strapping and construction information under Step 3):
<br /> 30In(750 mm)to All models except
<br /> •If concrete block is specified to anchor the IM-1060,the total combined minimum 38 in(900 mm) IM-540 and IM-1060 Nona
<br /> weight of blocks placed on each side of the tank shall be 2,700 pounds(1,225 kg). —"
<br /> The size and shape can be determined by locally available materials.Connect using 4 Leas than 30 in(750 mm) None None
<br /> two straps.
<br /> •For concrete-filled half pipe and concrete traffic barrier,the minimum length on each
<br /> side of the tank would be 4.2 feet(1.3 m),while at least 4.5 feet(1.4 m)of concrete
<br /> parking bumper would be required. These controls would be connected with two
<br /> straps,ensuring that the control extends a minimum of 6 inches(150 mm)beyond the
<br /> strap positions(see Figure 3).
<br /> •If helical anchors were selected,a minimum of two 6-inch(150 mm)diameter anchors
<br /> per side of tank(4 total)would be installed using two straps.
<br /> •
<br /> Contact Infiltrator Systems'Technical Services Department for assistance at 1-800-221-4436.
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