Preparation
The first thing completed on the underdrain when onsite
What is a complete inventory to ensure quantity and good quality?
The type of cement required for underdrain installation
What is Portland Type II?
The inspection required after bell/spigot assembly
What is O-ring inspection?
Sealant required for end cap assembly
What is Sikaflex 1a or 11FC?
Prior to testing the filter this is required
What is a full inspection for proper installation?
Evaluation of the filter basin elevation is checked to determine
What is to determine the high point of the filter floor?
The acceptable max time before grout pours
What is 24 hours?
The tolerance underdrain laterals must be installed
What is +/- 1/8"?
The % anchor rods are to be inspected around flume
What is 100%?
Air distribution testing is completed to
What is ensure evenness of performance?
The correct filter floor surface roughness
What is 1/8" broom finish?
The temperature range grout can be installed
What is 40 F - 100 F?
The inspection required with IMS cap
What is inspect for all screws?
The required anchor rod depth
What is 5"?
Full rate backwash testing is performed to
What is to ensure integrity of installation?
Filter floor or wall coatings at the underdrain
What is not allowed?
The type of sand mixed with cement
What is clean dry masonry sand?
The tolerance a filter must be installed (between laterals)
What is +/- 1/4"?
The dimension grout chamfers are to be installed on underdrain
What is 2"?
Required after testing but before media loading
What is drain the water and reinspect the filter installation?
Before installing underdrain the filter piping and flumes must be
What is inspected and cleaned?
The proper sand cement mix ratio
What is 2:1?
The elevation of fill grout or mono pours
What is to the top deck of the underdrain but not over the bell/spigot joint?
The anchor rod pull testing procedure
What is 3,200 lbs. of tension in 1,600 lb. increments?
Required after filter installation and testing
What is completed field service report (including pictures)?