Waste Characterization and Underground Source of Drinking Water (USDW) Monitoring for Class I Injection Wells


Class I Injection wells are used for the disposal of injectable waste material into an isolated subsurface formation that is typically several thousand feet below ground surface. This disposal method can be very beneficial for large facilities or industries that produce significant quantities of liquid waste that cannot be discharged under a NPDES permit or where transport to another disposal facility is cost prohibitive. However, deep well disposal is highly permitted and requires a great deal monitoring of not only the material being injected but the groundwater throughout the facility. Monitoring groundwater can provide an indication that the injection wells are operating properly and to confirm that waste has not migrated beyond the isolated formation.


Cox-Colvin was asked by the client to develop a waste characterization plan and USDW groundwater monitoring plan that would be submitted as part of the Class I permit application. These plans outlined the sampling protocols, laboratory methods, and statistic evaluation approach that will act as the foundation for monitoring throughout the life of the Class I injection wells. Cox-Colvin was also asked to conduct the monitoring activities, data review, and reporting requirements outlined in the Class I permit. Cox-Colvin’s assistance provides the client with expertise, reliability, and a reduced workload for facility personnel.