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7.4.VENTING INTERSTITIAL SPACES NOTICE NOTICE Make sure that no heavy objects are allowed to distort the AIwetmonitoringsystemsmustbeventedforproperopera- containment sump top after final assembly.This includes tion.Failure to do this could result in damage to the tank and/or the street box and concrete pad.No weight should be surrounding property. transferred to the tank.Failure to follow this notice could 7.4.1.When the tank's interstitial space is filled with a monitoring result in property damage. fluid,the space must be vented.It is sufficientto drill a 1/4-inch-dia meter 7.5.6.To complete the containmentsump installation: [6-mm-diameter]hole in the side orcap of the reservoir standpipe as • Backfill to the top of the containmentsump system. supplied by the installer.If the groundwater level could be high enough • Backfill around the outside edge of the containment sump, to entera drilled vent hole,install a vent line from the standpipe and making sure that no backfill is on top of the containment position it above the high-water level. sump.See Figure 7-1,Backfill A. • Isolate the containment sump from all traffic loads. 7.4.2.When the interstitial space is dry,it is not necessary to vent • Install a concrete form/barrier(for example,the concrete pad/street- the space to atmosphere. box frame)to allow a minimum 3-inch[7.5 cm] clearance between 7.5.INSTALLING CONTAINMENT SUMPS any load-bearing item and the containmentsump top. • Typically,a sheet of plywood(or other material)is used as a barrier 7.5.1.Containment sumps come in a variety of models and sizes. and is set on the backfill to ensure that there is at least a 3-inch 7.5.2. Instructions forthe different models are found in supplemental [7.5 cm]clearance above the containmentsump top.See Figure 7-1, materials.See the Introduction for information on where to obtain Barrier B. supplemental instructions. • Choose a street-box size that allows enough clearance around the containment sump top opening for proper operation 7.5.3.The contammentsump provides an enclosure fora submersible of the cover. pump and a termination point for secondary piping systems. • Set the street box,and check for clearance to allow access • It provides containment of product from the pump and/or piping and space to remove the watertight cover.See Figure 7-1, connections. Street Box C. • It is designed to be monitored continuously using electronic sensors. • Contin uewith backfill,asreq uired,tosubgrade.See Figure7-1, 7.5.4. Before installing containment sumps: Backfill A. • consult all codes and regulations of appropriate governmental • Maintain good drainage of water away from the access opening agencies to ensure proper monitoring compliance of the containment sump top when installing the surface pad. • sssure that all containment sumps will be isolated from See Figure 7-1,Surface Pad D. traffic loads • perform a visual inspection of the sump for potential shipping damage No Backfill on the Barrier B • contact the manufacturing facility that shipped the tank if damage is ContainmentSump detected • check to make sure the sump is the correct length for intended Surface burial depth. Pad D Street Box C Backfill A • obtain the specific containment sump supplement for the application installation.See Introduction for list of supplements. 1 7.5.5.Install the containment sump according to the supplemental instructions that apply.Go to zcl.com to find additional copies of the supplements. „ CAUTION ��i iii ilii iii Always wear eye protection and gloves when handling,grinding, i ��iii cutting and attaching the containment sump unit.Failure to do so TYPICAL ii ii could result in minor or moderate injury. i i INSTALLATION viii NOTICE (Watertight Cover Shown) i�iiiii� Do not drop the containment sump assembly components or ' iiiiii allow the sum body to roll.Since high damage ii,� i P Y 9 9 ilii ii sump components,protect and secure all pieces ifwindy condi- tions arise.Failure to follow this notice could result in damage to surrounding property. 7: PIPING,VENTING AND CONTAINMENT SUMPS 25