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Ina oarse-textured or rocky soil, it may be difficult to make a <br />suita le slurry from the existing soil. A slurry can be made using <br />silica flour, which is then used to establish good contact between <br />the c ramie cup and the soil. Fora 2-inch diameter hole, 1 1b. of <br />silica flour is needed, while a 4-inch diameter hole will require 4 <br />]bs. o silica. Mix the silica with water to produce a slurry with a <br />consi tency of cement mortar. <br />Core he hole to the desired depth, and pour in about 1/4 of the <br />silica slurry. Insert the Soil Water Sampler and pour in the re- <br />main er of the slurry so that the slurry completely covers the ce- <br />ramic cup. Backfill the hole with sifted soil (free of pebbles and <br />rocks ,tamping continuously with a metal rod to prevent surface <br />water from channeling down between the soil and the body tube of <br />the S mpler (see Figure 8). <br />Access Tubes <br />Tampetl Soil <br />a~ <br />Depth Sifletl <br />As Requlrea Backfill <br />200 Mesh Silica <br />Flour Slurry <br />Figure 9 <br />To ens re that disturbed soil resulting from the installation oi'the <br />Sampl r does not affect the movement of water to the Sampler, <br />Bento ite clay plugs can be installed. Core the hole a few inches <br />deepe than the desired depth, and pour in several inches of wet <br />Bento ite clay'(see Fig. 9). This will isolate the Sampler From the <br />soil be ow. Pour in 1/4 of the slurry, either of soil or of Silica, and <br />insert the Soil Water Sampler. Pour the remainder of the slurry <br />aroun the cup of the Soi] Water Sampler Backfill with native soil <br />to a le el just above the Soil Water Sampler and again add suffi- <br />cient entonite as a plug to further isolate the Soil Water Sampler <br />and and against possible channeling of water down the hole. <br />Backfi 1 the remainder of the hole slowly, tamping continuously <br />with a metal rod using native soil, free of pebbles and rocks. <br />SOILMOISTURE EQUIPMENT CORP. ~ 12 ^" <br />P.O. Box 30025, Sonto Borboro. Co GFornio 93105 USA / \ <br />Phone: (8051 964-3525 ~ Fox: (BOS) 683-2189 SOILMOISTURE <br />e-moil: solesOsoilmoisture.mm ~ Web: http://wwwsoilmoi ture.com <br />