Theme: 01. Remediation Technology Innovations

Topic Area: 01h. Horizontal Wells: Applications and Lessons Learned in Site Characterization and Remediation

Formatted Title:

Life Cycle Cost Benefits for Nested Horizontal Wells at Chlorinated and Petroleum Remediation Sites

Background/Objectives:

Nested horizontal wells (NHWs) with individual, isolated screened intervals have been installed for assessment, remediation and monitored for performance for most remedial technologies including air sparging (AS), biosparging (BS), soil vapor extraction (SVE), ozone sparging (ozone), advanced oxidation processes (AOPs), in situ chemical oxidation (ISCO) injection, bioaugmentation, vapor mitigation, and recirculation. In most cases, NHWs are installed in areas where typical vertical installation is extremely difficult: below buildings, roadways, or fueling components but they are also installed in open areas where vertical comparisons can be evaluated.

Approach/Activities:

The cost effectiveness of this type of installation can be misunderstood, especially as the capabilities have drastically improved with recent advancements in installation and well design. This presentation will illustrate the many cost features and customizations and compare the life cycle cost economics to traditional vertical layouts. Side by side these results will be shown to gauge the relative savings on numerous sites around the country from Colorado (AS/SVE), Florida (ISCO injection, BS and ozone), Texas (SVE), Arizona (ISCO injection), and California (vapor mitigation).

Results/Lessons Learned:

The comparative costs will be presented as a matrix, and we will provide an overview of the project site layouts and examine the capabilities of NHWs in the development of conceptual site models and remedial design.

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Wes Wiley