Abstract: A subsurface discrete interval system for water and soil vapor, providing verifiable interval isolation, media evaluation and monitoring, field modifiability, extraction, and injection capabilities. The system comprises an outer structure (01) and inner core (02), each comprised of one or more seal sections (03) and one or more port sections (04). A user of the system can monitor, sample, and evaluate the characteristics of the media of interest at verifiable isolated discrete intervals. A user of the system can extract or inject fluid, vapor, or multiphase substances in the media of interest. During installation or anytime afterwards the user can modify or remove the system to meet the dynamic conditions and needs frequently encountered during subsurface investigation and/or remediation.