Abstract: Systems and methods for safe collection and transportation of fluid samples for analysis are described. A system embodiment includes, but is not limited to, a housing defining an interior region to introduce a fluid sample to a sample vessel; a support platform to hold the sample vessel and laterally position the sample vessel to a plurality of locations within the interior region; an uncapper configured to automatically remove a cap of the sample vessel from a base of the sample vessel prior to introduction of the fluid sample to the base and to automatically replace the cap to the vessel base subsequent to introduction of the fluid sample to the base; and a fluid sample probe configured to fluidically couple with a fluid sample source and to dispense fluid from the fluid sample source into the vessel base.

Abstract: A reagent delivery method includes positioning reagent delivery tubes in contact with soil. The tubes can include a wall that is permeable to a soil-modifying reagent. The method further includes supplying the reagent in the tubes, diffusing the reagent through the permeable wall and into the soil, and chemically modifying a selected component of the soil using the reagent. The tubes can be in subsurface contact with soil, including groundwater, and can be placed with directional drilling equipment independent of groundwater well casings. The soil-modifying reagent includes a variety of gases, liquids, colloids, and adsorbents that may be reactive or non-reactive with soil components. The method may be used inter alia to form reactive barriers, control pests, and enhance soil nutrients for microbes and plants.