Northgate Holding’s provides on-site laboratory testing services to ensure all solidification and stabilization goals are met.  On-site testing is utilized to finalize solidification mix designs and mix ratios for individual waste streams, bulking agents, and pozzolanic materials.  Once mix designs are determined, on-site testing is performed at regular intervals to confirm solidification and stabilization goals are being met and allow for on-site adjustments to mix ratios as needed.  Patent pending (Application No. 63/891,583) Modified Liquid Release Testing and Post Compression Pocket Penetrometer Direct Read Testing are performed to simulate landfill burial pressures up to 100 PSI. Mix designs can be adjusted to meet every landfill’s liquid release goals at varying burial pressures. Pocket penetrometer readings can be obtained from the liquid release procedure pressurized cylinder to determine compressive strength of the solidified material under simulated landfill pressures.

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Testing services typically performed on the solidified and stabilized waste on-site include:

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• Paint Filter Liquids Test (EPA 9095B).

• Modified Liquids Release Test (Patent Pending).

• Post Compression Pocket Penetrometer Direct Read Test (Patent Pending)

 

Northgate Holdings has modified the EPA Liquids Release Test Procedure to allow for the precise measurement of the volume of liquid released by adding a discharge port and measuring device to the pressure application device.  This allows for the on-site determination of the percentage of liquid release from solidified waste at varying simulated pressure conditions.  

 

Standard laboratory testing for compressive strength (ASTM D2166-Unconfined Compressive Strength of Cohesive Soil and ASTM D2580-Unconsolidated-Undrained Triaxial Compressive Test on Cohesive Soil) are designed for use on cohesive soils (clay type materials).  Because the solidified and stabilized waste to be tested is not a cohesive soil, these standard laboratory tests can not be affectively performed on most solidified and stabilized waste material.  To determine the compressive strength of the solidified and stabilized waste under simulated landfill conditions, a Pocket Penetrometer is utilized in conjunction with the Liquids Release Test Procedure.  Following completion of the Liquids Release Test, the pressure application device is dismantled and a Pocket Penetrometer is utilized to test the compressive strength of the waste sample contained in the pressure application device.