Once the concrete and plastic parts have been installed properly backfill the system with washed concrete sand ASTM C-33 or state approved septic fill. Place backfill material between the fins along the filter fabric wrap and in front of the fins. Backfill in 12" lifts using a modified hand tamper (available from Cur-Tech) or equal form of compaction. Compact material as tight as possible. Be careful not to tear or pull away filter fabric. Repeat the process until the backfill is equal to the top of the plastic on the plastic parts.
Cover the entire Cur-Tech system with filter fabric. Backfill with clean soil at a minimum of 6" of cover. The distribution application used is to be determined by that systems specific designer.
After the chambers have been installed level and in proper alignment, make sure the side bottom areas are level with the bottom of the concrete chambers. Place the 4' long pre-assembled CTL plastic fin segments on top of the concrete chambers. Connect Two 4' segments together by using the provided back pieces, top straps and base pieces to create 8' lengths.
Pick up each 8' segment and place is alongside the concrete structure with the fabric covered side facing away from the structure. Align the plastic with the concrete chamber side so the ends line up and all the side openings are covered. If any gaps are present between the plastic and concrete parts. Carefully tap back piece tops, base pieces and on CTL 48 middle connector to close any gaps that might occur.
Repeat these procedures until both sides of the concrete chambers are tightly fitted with the plastic structures to the designed lengths. These steps are illustrated on the directions provided with the system at delivery.
After the work area has been prepared for installation according to approved plans, excavate trench 88" wide. When the trench has been excavated to the plans specified length and the bottom has been leveled, start installing the Cur-Tech concrete chambers.
Each chamber has knockouts on the ends and sides. Break out all the knockouts on the 8' long sides of the chambers. Break out any chamber end knockouts that are to be set against another chamber end. Leave the knockouts intact on the first wall of the first chamber and the end wall of the entire row. This will leave the end walls free from soil migration into the chambers. Cover the seam between the concrete chambers with a 8-10 inch wide piece of filter fabric.
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Cur-Tech recommends that the design engineer for each job specify the proper H-20 loading subsurface preparation. Cur-Tech also requires in an H-20 application that after the fabric is placed on top of the system as described in the installation instructions, the area on top of the plastic fins be filled level with the top of the concrete chambers with the same approved material used for the systems installation. Cur-Tech also requires that the area on top of the entire structure should be filled with a minimum of 10" of compacted gravel or 3/4" process material. Click here for the drawing details.
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