Remediation Field Services

At Legacy Remediation, we have extensive experience with all methods of in-situ remedial injections. Typically, costs follow a general hierarchy, with well injection being the most cost-effective, followed by Geoprobe direct push injection, CPT direct push injection, and Direct Sonic Injection (DSI) for in-situ remediation chemistries. We have hands-on field experience using a wide range of remediation products and chemistries, and we understand the unique handling, application, and safety requirements for each.

We are a highly detail-oriented team and recognize the importance of thorough pre-project planning. We take a proactive approach, understanding that careful preparation and overplanning are critical to minimizing unforeseen challenges and ensuring successful project execution.

Well Injection

Injection wells are typically used for in-situ remediation when the treatment interval is deeper, when the subsurface lithology is relatively homogeneous, or when four or more injection events are anticipated. The primary advantage of this method is that injection costs can be lower. However, a key limitation is that it can be more challenging to control the vertical distribution of the injected amendments.

Geoprobe Direct Push Injection

Geoprobe direct push injection has become one of the most widely used and cost-effective methods for in-situ remediation. With the use of our specialized top-down, bottom-up, and directional injection tools, this method provides excellent control over the vertical distribution and emplacement of remedial compounds.

CPT Injection

CPT injection is typically used for in-situ remediation when the target treatment interval cannot be effectively reached using Geoprobe rigs. We work with a teaming partner that operates CPT trucks equipped with DPT hammers. We have found that the combined static weight of CPT rigs and the mounted hammer allows for more reliable advancement through tighter zones and into greater depths, whereas larger-class Geoprobe rigs may experience tooling damage due to reliance on higher-impact hammer energy alone.

Direct Sonic Injection (DSI)

Direct Sonic Injection (DSI) is a newer injection method; however, with our advancements in methodology and tooling, it has become a highly effective approach for sites with challenging geology. This method allows for improved delivery in complex subsurface conditions where traditional injection techniques may be less effective.