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Tank Sump Manual enviro,n-� 7. BASE/RISER CONNECTIONS 8.1 Polyethylene Riser Fabrication Using a saber saw,the riser can be cut to the desired height by cutting For both deep and extended burial tank in the valley of two ribs. All cuts should be even,and if necessary,all sumps which have separate base andedges cleaned with a razor knife or a plastic de-burring tool. Make sure riser sections, it is necessary to follow there is enough riser left to extend into the skirt of the street manhole the assembly instructions for proper so that the bottom of the street manhole skirt does not interfere with installation of each combination of joint. the top sump base. 8.2 Fiberglass Riser Fabrication Measure down from the top of the riser to the desired height and place 7.1 Polyethylene Riser a mark on the riser. Using a flexible tape,draw a line connecting the Begin assembly by placing the sump riser section on top of the sump marks.With a saber saw,cut along the perimeter of the riser.Be sure base flange. From inside the sump, position one compression ring to de-burr all the edges after cutting. section on the riser flange and another underneath the base flange. IMPORTANT:Leave a minimum of 3"of sump riser to allow for proper clearance of the sump cover. Secure the two ring sections by loosely installing the fasteners into the bolt holes. Continue this same procedure until all segments of the compression ring have been installed and secured. Tighten all RISER/COVER SEAL fasteners to 60 inch pounds using a torque wrench. 9 IMPORTANT: Always store riser sections with the flange After the riser has been cut to the side up to prevent damage to the gasket during site appropriate burial height, the cover storage. Sump base flange and gasket must be clean seal should be installed to the top of s : and free of debris prior to assembly. the riser. A tube of adhesive is y rte.. provided to bond the cover seal to { the top of the riser. Apply the 7.2 Fiberglass Riser adhesive entirely around the seal Prior to installing a fiberglass riser to a fiberglass base, it is area of the riser, both inside and out. necessary to rough sand the entire outside diameter of the riser Then smooth out the adhesive so (the portion which will sit inside the collar of the base) as well that it evenly covers the entire area. Allow to set for ten minutes. Next,install the cover seal over the as the entire inside diameter of the base collar,with a heavy grit sandpaper. This removes any oxidation, grease or grime, riser edge and position it evenly into the riser edge. Once creating suitable bonding surface for the resin kit.Once this has installed, inspect around the entire diameter for evenness. been completed, carefully insert the riser into the base collar making sure it is evenly positioned. 10. PIPE ENTRY LOCATIONS 4 7.2.1 Preparing the adhesive For standard pipe burial applications, - the piping should enter at the lowest Refer to the fiberglass adhesive mixing instructions in section the adhesive possible entry point in the sump. For 6.2.3 for proper preparation of the adhesive.After determining the correct pipe entry has been properly mixed, prepare to apply the adhesive to the location for tank sumps, refer to the overlap joint from outside the sump. GeoFlex®piping manual. Refer to the � flexible entry boot manual for the 7.2.2 Applying the adhesive proper installation of all pipe entries. Using a plastic knife, liberally apply the adhesive into the overlap groove. Continue to apply adhesive evenly around the entire perimeter of the joint. Make sure the entire overlap joint vTANK SUMP BACKFILL MATERIALS is filled completely to avoid any potential leak areas.Scrape the 11 top of the joint clean using the plastic knife. Adhesive should fully cure at ambient temperature of 70°F- 100°F in 24 hours. IMPORTANT: Prior to backfilling around the tank sump, make sure the sump cover has been installed to prevent any deformation of the riser during backfilling. S. RISER HEIGHT FABRICATION Approved backfill materials for tank sumps shall meet t e The riser sections of tank sumps have following specifications: structural ribs which are two inches on center. 11.1 Pea Gravel Rounded pea gravel is permitted with a minimum diameter of 1/8" and a maximum diameter of 3/4". 8