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`~ Access Tubes <br />Tamped Soil <br />Bemonite <br />Plug <br />Depth Sifted Backfill <br />As Requiretl <br />200 Mesh Silica <br />Flour Slurry <br />6ontonite <br />Pluq <br />Figure 9. <br />Protecting the Access Tubes After installation, the access tubes from the Sampler are termi- <br />natedwith a 6-inch length of neoprene tubing (MRT003)above the <br />Sampler installation. Or, if conditions require, place the neoprene- <br />terminated access tubes in a trench, terminating above the soil <br />surface at a remote location. We recommend that the access tubes <br />be protected inside a conduit tube running from the top of the Sam- <br />pler to the termination at the surface. At the surface level, take <br />care that the access tubes are safe from damage by mechanical <br />equipment or animals. Do not cover the surface area directly above <br />the Sampler in any manner that would interfere with the normal <br />percolation of soil water down to the depth of the Sampler, other- <br />wise the obstruction could have an adverse affect on your soil wa- <br />ter sample. <br />Collecting A Sample in the To collect a sample, the discharge access tube is closed using a <br />Sampler clamping ring, and the vacuum port of the hand pump is connected <br />to the Pressure-Vacuum access tube. The pump is then used to <br />create a vacuum of about 60 cb inside the Sampler, which is indi- <br />cated on the gauge connected to the pump (see Fig. 10). <br />Figure 10. <br />SOILMOISTURE EQUIPMENT CORP. 13 ^® <br />P.O. Box 30025. Sonto Borboro. (olifornio 93105 USA / \ <br />Phone: (8051 964-3525 • Fox: (805) 683-2189 soiiMOisTURe <br />e-moil: solesQsoilmoisWre.com ~ Web: http: //wwwsoilmoisture.com <br />