Current through Register Vol. XLI, No. 24, June 14, 2024
Section 47-60-9 - Tremie Pipes and Sealing Procedures9.1. Materials. -- The tremie pipe used for the placement of sealant materials shall be one of the following materials and shall exhibit pressure ratings adequate for the pumping pressures to be used: 9.1.b. Rubber-covered hose reinforced with braided fiber or steel,9.1.c. Thermoplastic pipe including but not limited to: 9.1.c.1. Polyvinyl chloride (PVC),9.1.c.2. Chlorinated polyvinyl chloride (CPVC),9.1.c.3. Polyethylene (PE),9.1.c.4. Polybutylene (PB), or9.1.c.5. Acrylonitrite butadiene styrene (ABS).9.2. Procedures. -- This subsection describes groundwater regulatory agency approved sealant placement methods when a tremie pipe is used. Note: These procedures apply to the use of grout or slurry sealant.
9.2.a. The sealant material shall be placed in such a manner as to not disturb the integrity of the filter pack and seal, and to not threaten the integrity of the riser.9.2.b. When a tremie pipe is used for placement of fluid sealants, the bottom end shall be kept submerged in the sealant material throughout the sealing process.9.2.c. The sealant material shall be brought up to the ground surface seal. Any settling of the sealant material shall be topped off.9.2.d. Tremie pipe - gravity. Sealing material may flow by gravity through a funnel or hopper connected to a tremie pipe. The tremie pipe shall be lowered to the bottom of the annular space or borehole to be sealed and the sealing material placed from the bottom up.9.2.e. Tremie pipe - pumped. Sealing material shall be placed by a pump through a tremie pipe into the annular space or borehole. Tremie pipes used for the placing of pumped slurry or grout should be fitted with a J-hook end or a closed end with side discharge. Note: The J-hook end or closed end with side discharge of the tremie pipe will direct the flow of the materials to the side or upward.