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3 In a coarse-textured or rocky soil, it may be difficult to make a suitable slurry from the existing soil.A slurry can be made using silica flour,which is then used to establish good contact between the ceramic cup and the soil. For a 2-inch diameter hole, 1 lb. of silica flour is needed,while a 4-inch diameter hole will require 4 lbs. of silica. Mix the silica with water to produce a slurry with a consistency of cement mortar. Core the hole to the desired depth, and pour in about 1/4 of the silica slurry. Insert the Soil Water Sampler and pour in the re- mainder of the slurry so that the slurry completely covers the ce- ramic cup. Backfill the hole with sifted soil (free of pebbles and rocks), tamping continuously with a metal rod to prevent surface water from channeling down between the soil and the body tube of the Sampler(see Figure 8). Ax rubes T Soil OeSifted As Backfill 200 Mesh SIN. Figure 8. Flour Slurry To ensure that disturbed soil resulting from the installation of the Sampler does not affect the movement of water to the Sampler, Bentonite clay plugs can be installed. Core the hole a few inches deeper than the desired depth, and pour in several inches of wet Bentonite clay(see Fig. 9).This will isolate the Sampler from the soil below. Pour in V4 of the slurry,either of soil or of Silica, and insert the Soil Water Sampler. Pour the remainder of the slurry around the cup of the Soil Water Sampler.Backfill with native soil to a level just above the Sail Water Sampler and again add suffi- cient Bentonite as a plug to further isolate the Soil Water Sampler and guard against possible channeling of water down the hole. Backfill the remainder of the hole slowly, tamping continuously with a metal rod using native soil,free of pebbles and rocks. SOILMOISTURE EQUIPMENT CORP. 12 P.O.Box 30025,Santo Barbaro,California 93105 USA Phone:(805)964-3525•Fox:(805)683-2189 SOILMOISTURE e-mail:soles®soilmoisture.com •Web:http://www.soilmoisture.com