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Sunday, 25 Jun 2017

Soil Gas Sampling Implants

Geoprobe® implants are stainless steel screens that can be inserted down the bore of a rod and anchored at depth. Geoprobe® implants are unique in their ability to be "Post Run"... they are not carried in the rod during driving, but rather inserted down the bore when the appropriate depth has been reached. Once the implant is slid down the bore, it is simply rotated to attach it to the anchor point used during driving. As rods are removed from the hole, the implant and associated tubing remain firmly anchored at the bottom.

Geoprobe® implants are constructed of double woven stainless steel wire screen. All end fittings are stainless steel as well. Implants are available in 6-in. (152 mm) lengths with the AT86 series, 21-in. (533 mm) lengths with the AT87 series, or 12-in. (356 mm) lengths with the latest AT96 series. The user can also connect multiple 21-in. (533 mm) lengths together using the AT89 series implants. Geoprobe® implants have a pore diameter of 0,0057 inch (0.145 mm).

Geoprobe® Permanent Implants Advantages...
  • Placed through bore after rods have been driven to depth.
  • Variety of implant lengths to suit the application.
  • Designed to fit a wide array of tubing materials and sizes.
  • Can be set at any depth attainable by soil probe (100+ ft. [30 m]).
  • Screens made entirely of stainless steel.

Prepacked Sparge Points

Geoprobe® Prepacked Sparge Points are an alternative to using implants for air sparging. The sparge points are installed through 2.25 in. probe rod using flexible tubing instead of PVC riser. Each Prepacked Sparge Point includes a compression fitting for connecting 0.625 in. OD tubing. These discrete interval sparge points have been used at many facilities for sparging groundwater to achieve remediation goals for volatile contaminants.

Now, with the increase in vapor intrusion investigations, you can also use them for soil gas monitoring applications. They are less expensive to use than typical implants, are available with 0.75 in. PVC and 0.5 in PVC. The stainless screen is 50 mesh (0.011- in. openings), and the slot size is 0.010 in. (commonly referred to as ten-slot).

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