In the early days of soil sampling, excavation was the most commonly used way to access soil samples. With the addition of geoprobe technology, this is no longer possible and soil samples can be taken easily and with little disruption to the environment. In fact, geoprobe sampling is improving as the very first geoprobe units were large and bulky, thus unable to maneuver in small or tight areas. Now with Geoprobe Direct Push Technology, soil probes can be done nearly anywhere. This has made the process of probing for environmental contaminants easier and more cost effective.
Geoprobe definition: A special machine used to make soil borings and to create temporary groundwater monitoring wells.
These days, geoprobe units can be attached to trucks, four wheel drive vehicles and even ATV’s to allow contractors easy access to most any area without significant disturbance to the surroundings. Environmental NJ Pros uses geoprobing when there are questions about oil discharge, but it isn’t economically feasible to excavate the surrounding area.
The most common method for obtaining a soil sample is through the use of a core soil sampler. These samplers have a coring barrel that is pushed into the ground through the use of a DPT hammer. The resulting core samples can then be visually examined and they can also be cut for laboratory analysis. The core soil samplers work best in cohesive soils, though it is possible to sample even coarse or medium grain sandy material.
In some situations it is necessary to sample below the level of the groundwater table. In these instances, a closed point system is utilized.
These closed point systems are solid, piston sealed devices and can collect samples at greater depths. It should be noted though that while a closed point system is capable of sampling deeper than 20 feet into the soil, this can be very time consuming. In such cases a dual tube soil sampling system is often used to collect continuous soil core samples.
An even more effective solution when the desired depth of the soil sample is known is the core piston rod soil sampling system. This soil sampler remains closed until the proper depth is achieved, at which point the operator simply releases a stop pin and the sample is collected. This has numerous benefits, including reduced sample compression, ease of use, durability, and ease of maintenance.
In situations where the material being sampled is loose, such as sandy or gravelly materials, an MC stop pin coupler can be used to retrieve suitable samples. This is only necessary in situations where sample recovery is made difficult by loose or porous soil substrate.
Environmental NJ Pros is committed to helping the NJ environment through the use of advanced technologies whenever possible. Geoprobe drilling is one such technology that may not be suitable in most cases, but is available when other soil sampling methods are untenable. Contact us today for any environmental service task. Our 30 years of experience ensures you will be pleased with our results.