SR0081813 - Laserfiche WebLink

Home Browse Search

7.4. VENTING INTERSTITIAL SPACES NOTICE All wet monitoring systems must be vented for proper opera- tion. Failure to do this could result in damage to the tank and/or surrounding property. 7.4.1. When the tank's interstitial space is filled with a monitoring fluid, the space must be vented. It is sufficient to drill a 1/a -inch -diameter [6 -mm -diameter] hole in the side or cap of the reservoir standpipe as supplied by the installer. If the groundwater level could be high enough to enter a drilled vent hole, install a vent line from the standpipe and position it above the high-water level. 7.4.2. When the interstitial space is dry, it is not necessary to vent the space to atmosphere. 7.5. INSTALLING CONTAINMENT SUMPS 7.5.1. Containment sumps come in a variety of models and sizes 7.5.2. Instructions forthe different models are found in supplemental materials. See the Introduction for information on where to obtain supplemental instructions. 7.5.3. The containment sump provides an enclosure fora submersible pump and a termination point for secondary piping systems. • It provides containment of product from the pump and/or piping connections. • It is designed to be monitored continuously using electronic sensors. 7.5.4. Before installing containment sumps: • consult all codes and regulations of appropriate governmental agencies to ensure proper monitoring compliance • sssure that all containment sumps will be isolated from traffic loads • perform a visual inspection of the sump for potential shipping damage • contact the manufacturing facility that shipped the tank if damage is detected • check to make sure the sump is the correct length for intended burial depth. • obtain the specific containment sump supplement for the application installation. See Introduction for list of supplements. 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. A CAUTION Always wear eye protection and gloves when handling, grinding, cutting and attaching the containment sump unit. Failure to do so could result in minor or moderate injury. NOTICE Do not drop the containment sump assembly components or allow the sump body to roll. Since high winds could damage the sump components, protect and secure all pieces if windy condi- tions arise. Failure to follow this notice could result in damage to surrounding property. NOTICE Make sure that no heavy objects are allowed to distort the containment sump top after final assembly. This includes the street box and concrete pad. No weight should be transferred to the tank. Failure to follow this notice could result in property damage. 7.5.6. To complete the containment sump installation: • Backfill to the top of the containment sump system. • Backfill around the outside edge of the containment sump, making sure that no backfill is on top of the containment sump. See Figure 7.1, Backfill A. • Isolate the containment sump from all traffic loads. • Install a concrete form/barrier (for example, the concrete pad/street- box frame) to allow a minimum 3 -inch [7.5 cm] clearance between any load-bearing item and the containment sump top. • Typically, a sheet of plywood (or other material) is used as a barrier and is set on the backfill to ensure that there is at least a 3 -inch [7.5 cm] clearance above the containment sump top. See Figure 7-1, Barrier B. • Choose a street -box size that allows enough clearance around the containment sump top opening for proper operation of the cover. • Set the street box, and check for clearance to allow access and space to remove the watertight cover. See Figure 7.1, Street Box C. • Continue with backfill, as required, to subgrade. See Figure 7-1, Backfill A. • Maintain good drainage of water away from the access opening of the containment sump top when installing the surface pad. See Figure 7-1, Surface Pad D. 25