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b)For a tank soil cover depth that is greater than 2.0 feet and up to 4.0 feet(600 to if needed.Long-term groundwater control measures such as underdrains and
<br /> 1,200 mm),suitable soil textures include: interceptor trenches may be sensible if the site is amenable to construction of a
<br /> control system and such systems are not prohibited by regulation or law,and the tank
<br /> ���°�<�^� location is not subject to flooding.Properly installed underdrains and groundwater
<br /> NEv
<br /> �u��uab�< 'i interceptor trenches may prevent the need for tank buoyancy controi measures.
<br /> eo Sui�aMe If santl z30•b I
<br /> arM dilatant
<br /> 20
<br /> I '� s°"a°'° � INSTALLING UNDER SHALLOW GROUNDWATER CONDITIONS
<br /> Arkansas onty:
<br /> Fo�sne:w�m 9,ea�e�ma�wr�a���e Buoyancy control measures may be required if the Infittrator tank is to be installed
<br /> �o J0 Gay soil,bacMill shall be septic gravel
<br /> o�s�m�ia�a„9�ia�s,o�e.saea,a���n with less than 12 inches(300 mm)of soil backfill cover,and where the water level
<br /> °° �°,-,�z�^�^e5 outside the tank has the potential to rise 30 inches(750 mm)or more above the
<br /> ,e,«�, �ti,,� so pe1CB�,51LT elevation of the tank bottom.Otherwise,no control measures are required(see
<br /> s���° Table 1).The need for buoyancy control measures must be determined based on
<br /> �„ snr�o cur
<br /> =�A backfill cover depth and height of water outside of tank above the tank bottom
<br /> s��r��
<br /> ��^� according to Table 1.Refer to InfiRrator IM-and TW-Series Tank Buoyancy Control
<br /> SAN CLA
<br /> � AM Guidance document for more information.
<br /> °^ s��_�oa., Table 1:Tank models'and conditions requiring buoyancy control�
<br /> �
<br /> nNo �o s��1 Soil cover depth above tank'
<br /> iw>-:sauo w+ iooisi�T Waterheightabove
<br /> �o ao �� �� zo ,o tank bottom 6 in(150 mm)to Above 12 in
<br /> Pd<<e��i.Fr,c 5 oa� s od 12 in(300 mm) (300 mm)
<br /> 3 Above outlet Do not install Do not install
<br /> pipe saddle
<br /> 3. Backfill should not have stones greater than 3 inches(75 mm)in diameter or
<br /> excessive clods that do not break apart during placement and compaction. 3s in(soo mm)to4 qli models None
<br /> Backfill must be capable of occupying the spaces between the tank ribs and outlet pipe saddle
<br /> beneath the haunches. 3o in(75o mm)to Ail models except None
<br /> Note:Rounded screened aggregate(e.g.,pea gravel)is not a suitable 36 in(90o mm) IM-540 and IM-1060
<br /> b2Ckfill. Less than 30 in None None
<br /> 4. Standard field soil classification methods shall be used to determine the soil (�5o mm)
<br /> t2XtUfel CIeSS. 1.IM-540,IM-1060.TW-1250,TW-1500,and IM-1530.
<br /> Note:Under most circumstances,the determination of soil dilatancy will 2.See Infiltrator IM-and TW-Series Tank Buoyancy Control Guidance for detailed information on
<br /> not be required.Dilatancy shall be determined in the field using a test that the use of controls.
<br /> does not require specialized equipment,pe�ASTM D2488,Section 14.3. 3.No controls are required for soil cover depths exceeding 12 in(300 mm).
<br /> COIII lete instructions can be found at www.infiltrators stems.com 4•The tank shall not be installed where the water level outside the tank exceeds the height of the
<br /> P Y outlet pipe saddle.Follow Table 4 guidelines.
<br /> 5. Place and compact soil by walking-in beneath the haunches of the tank.
<br /> 6. Place backfill around the four sidewalls in an afternating manner,so that the backfill INSTALLING RISERS
<br /> height along the four sidewalls is maintained within a 12-inch(300-mm)tolerance. 1.Compatible risers include 24-inch(600 mm)diameter products such as
<br /> 7. Do not backfill top of tank before sidewalls are completely backfilled. the Infiltrator TW-Riser,EZset by Infiltrator,PolyLok�,Inc.,and Tuf-TiteO
<br /> 8. Continue to place backfill along the sidewalls in 12-inch(300-mm)lifts.Place Corporation,in addition to 24-inch(600 mm)diameter corrugated HDPE and
<br /> backfill between the ribs on the sidewalls such that the space between the IPEX URra RibO PVC pipe.Follow Infiltrator's IM-and TW-Series Tank Riser
<br /> ribs is completely filled with soil. Connection Guidance.
<br /> 9. Compact backfill material either by walking-in,hand tamping or mechanical 2•In Oregon only,watertightness testing shall include filling with water at least 2
<br /> compaction(includes backhoe bucket).If inechanical compaction is inches above riser connection,with no more than 1 gallon leakage per 24 hours,
<br /> used,such as a walk-behind tamper or backhoe bucket,a single pass is Per OAR 340-073-0025(3).
<br /> recommended.Compact each lift prior to placement of next lift.Compact INSTALLING PUMPS AND RELATED EQUIPMENT
<br /> backfill from tank walls to excavation sidewalls. Pumps may be supported on a stable,level 16x16-inch(400x400-mm)platform
<br /> 10.Complete backfilling and grade the area. positioned on the bottom of the tank.One 16x16-inch block or two 8x16-inch(200
<br /> 11.A minimum 6-inch(150-mm)depth of suitable soil must be placed over the -mm x 400-mm)side-by-side blocks may be used.Limit block height to account for
<br /> top of the tank.The balance of backfill placed to finish grade above the tank pump height and liquid levels during pump cycles.Block(s)should be placed below
<br /> may be either suitable or unsuitable soil. an access opening and level upon the tank bottom.For two blocks,orient them
<br /> 12.Establish a strong stand of erosion-resistant vegetation. perpendicular to ribs on the tank bottom,if present,for stability.
<br /> Note:Grade to prevent the backfilled excavation from filling with surface Installation of products such as electrical conduit and wiring,pumps,water level
<br /> runoff.lf the water level in the backfilled excavation exceeds the height of control equipment,valves,siphon equipment,etc.shall be in accordance with the
<br /> the outlet pipe saddle,tank structural integrity may be compromised. product manufacturer's instructions and compliant with applicable state or local rules
<br /> and regulations.Appurtenances shall be fastened to the tank riser system and not the
<br /> MouNo sncKFi��Foa--, —MiNiMUM e•soi�coveR tank body or access opening rim.Where possible,appurtenances shall be installed
<br /> POSITNE DRPJNAGE ' to facilitate maintenance and repair access via the tank access openings.
<br /> ����\�����i��i�������� ��������?���`�����\�\�\���e��_ Note:Prefabricated pump vaults may be installed.
<br /> %i i�i ii r- , ���i.���` �%���;
<br /> �������� � ������
<br /> � a � GENERAL SPECIFICATIONS
<br /> ��! � 3"(/5 mm) •Failure to comply with installation instructions will void warranty.
<br /> PL4CE SOIL �
<br /> BETWEEN RIBS �������.�.� � . � ���� PMnRiIaE size •Prior to ground disturbance,check for subsurface obstructions and utilities in
<br /> ���i� , ���` PacEsoi�iN conformance with applicable requirements.
<br /> COMPACTED I II �
<br /> SUITABLE NATIVE � � � �.i'i% �2"(300 mm) •Operating water temperature shall be less than 100°F(40°C).
<br /> SOILBACKFILL �� �� � �� � �u� UFTSAND •In cold conditions,handle and backfill tank with care to revent im act dama e.
<br /> � �� ' VV�j COMPACT P P J
<br /> � i������`�������f,�y������������O�i�����y����� •Tanks are not fire resistant.Store away from ignition sources.
<br /> \,�i���/� ���/�����.� ���� {�/��,/.� —PLACEANDCOMPACT
<br /> SOILBENEATHHAUNCHES •Removal of structural bulkheads is prohibited;removal of locking clips on the IM-
<br /> ie°-as•�asasoomm� �----{ •un-iososnoWn ro<<ere�e��e Series tank mid-seam connection is also prohibited.
<br /> OR SIZEDAS NECESSARV •Onl suitable for otable a lications if the tank bears the NSF/ANSI 61
<br /> TO ENSURE PROPER BACKFILLING PROCEDURE y p PP
<br /> certification mark.Otherwise,tank is recommended for use in septic,rainwater/
<br /> SHORT AND LONG-TERM GROUNDWATER CONTROL stormwater storage,holding,and pump applications,or other non-potable uses.
<br /> It may be necessary to implement groundwater control measures during tank •Infiltrator tanks are designed for installation underground.
<br /> installation.Maintain dry conditions by expanding the excavation to create a short- •Contact Infiltrator Systems for above-ground use requirements.
<br /> term groundwater collection sump for temporary placement of a dewatering pump
<br /> ��.. :��
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