In-Situ Remediation Technologies Overview

An Experienced Provider

Due to the recent invention of many in-situ treatment chemicals and bio-amendments, In-Situ Remediation methods have replaced Ex-Situ methods at many sites.  These methods include In-Situ Chemical Oxidation (ISCO), In-Situ Chemical Reduction (ISCR), In-Situ Bio-Remediation (ISBR), Surfactant Flushing, or a combination of multiple methods. Vista GeoScience conducted the first chemical injections in the Rocky Mountain region in the early 1990’s and has conducted in-situ projects from coast to coast ever since.  Most recently, Vista acquired the Clean-Inject® mixing and injection system which has improved slurry reagent injections in most types of lithology with precise high-pressure placement, greatly increasing the effectiveness of all in-situ treatments.  Working closely with our clients and vendors, we also provide expertise in characterizing the site specifically for in-situ remediation and design of the remediation program.

Vista does not sell or endorse any specific remediation product, but is experienced with the delivery and injection of all types of products and the different systems required to apply them including:  activated carbon, persulfates, permanganates, oxygen supplements, emulsified oils, lactates, nutrients, peroxides, iron (ZVI) slurries, and bacteria augmentation, just to name a few.

Custom Mixing, Pumping, and Delivery Systems

Vista found out early on in the injection business that a wide variety of product types and site conditions requires a wide variety of injection system designs.  Pump and mixing system design vary greatly depending on the
volume required, injection pressures, corrosivity or reactivity of the product, viscosity, etc..  Therefore, we offer many types of pumps with pressure ratings ranging from 150 to 2000psi, and flow rates from 2 to 50 gallons per minute.  Any number of portable mixing tanks can be arranged on support trucks and trailers, or setup on the site itself, depending on the access and logistical requirements at a given site.  Our systems are designed to be flexible and can accommodate the varied site conditions and access issues we may encounter.

Vista has re-designed injection tooling and application methods resulting in improved vertical and lateral distribution of the treatment compounds, resulting in better contact with the contaminants.  It’s a Contact Sport!  A wide variety of Direct-Push Technology (DPT) delivery systems are available to inject at depths up to 150’.  In tight soils or bedrock formations where hydraulic fracturing is required, we use DPT or open boreholes with Straddle-Packer Technologies and hold a license to provide these patented methods.  Our experienced staff can advise you on the advantages of Bottom-Up or Top-Down methods, helping to determine which will provide the best product contact and what parameters are critical to the success of the application.  In cases where re-injection is anticipated, we may also recommend installing permanent injection wells, discrete or nested, PVC or steel construction.

Real-Time Pressure and Flow monitoring instruments are included on all injection systems to monitor performance and subsurface behaviors of the injection.


NEW! Clean-Inject™ Remediation System

Self-Contained Slurry Mixing and High Pressure Injection System

Our new Clean-Inject® System provides a self-contained powerful mixing and injection system for many types of powdered reagents, such as activated carbons, oxidants, and other materials that require suspended slurry and precise injection methods in order to optimize their performance.  Super sacks of reagents can be used and are pumped directly into the mixing tank eliminating unnecessary exposure to personnel and the surrounding property.

When combined with our Surgical Injection Tooling, this cost saving system allows precise placement of most slurry material at narrow depth intervals.  High pressure and high flow rate pumps can overcome formations of all types from tight clays and claystone bedrocks to loose unconsolidated sands and gravels that are common problems for other types of pumping systems typically used for slurries.  The injection tooling and methods have also been optimized to reduce surfacing, keeping material in the contaminated and saturated formation where it is needed.

With top-down injection methods, the amount of material injected can be varied by as tight as one foot intervals from the top of the contaminated interval to the bottom utilizing expensive reagents more efficiently and ensuring their effectiveness.  Combined with better Remedial Design Characterization (RDC) and best the practices, treatment placement and coverage is now optimized. Contact us for further information on Clean-Inject System Specifications.

Why would I need Hydraulic Fracturing?

Hydraulic fracturing is a proven and patented technology where combinations of slurried proppants, chemical treatments, or bio-amended solutions are injected into tight soils and bedrock under high pressures for the purpose of creating fractures.  Creation of such fractures increases permeability, enhances the distribution and contact of remedial solutions, and is used extensively for In-Situ Chemical Oxidation (ISCO), Chemical Reduction (ISCR), and Bio-Remediation (ISBR), and SVE applications.  Once created, the fractures are held open with a variety of proppants such as sand or a more porous synthetic material which also act as a host for various bacteria.
Are you having trouble reaching your clean-up levels?  Are tight soils/bedrock causing poor air sparging (AS), or are soil vapor extraction (SVE) results prohibiting closure?  Is inadequate contact and retention time between remedial fluids and contaminants slowing the closure process at your sites?  Then hydraulic fracturing may be the technology for your site.

Vista GeoScience staff was the first in the Rocky Mountain area to provide hydraulic fracturing services in the 1990s, and currently holds the only license to hydraulically emplace fractures for remediation.  Vista has world-class expertise in emplacing fractures at sites in Japan, Australia, and across North America.  Vista is experienced at injecting a wide variety of products into these fractures, including permanganates, chemical oxygen enhancers, lactates, peroxides, ZVI-slurries, EVO-emulsions, and bacteria suspensions.

Customized Fracturing Equipment & Real-Time Monitoring Systems

Different geology, contaminants, and treatment solutions require a wide variety of fracturing and proppant injection system design.  Depending on these variables, Vista implements various fracture techniques, and utilizes progressive cavity pumps, piston pumps, diaphragm pumps, and mixing systems.

Vista offers real-time monitoring during the creation of each fracture.  Our system allows the engineer the ability to map and control propagation of the fracture while simultaneously plotting the fracture position with time.  This is especially critical when fractures are emplaced underneath residential/commercial sites and where determination of effective ROIs is necessary for full-scale remedial designs and regulatory concurrence.