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REQUIREMENTS PRIOR TO USE AND HOW TO OPERATE Attaching the Access Tubes Once the depth and location for the Pressure-Vacuum Soil Water Sampler have been established,you must determine the required length for the access tubes before they are cut and attached to the Soil Water Sampler. The access tubes are generally made of 1/4-inch O.D. polyethyl- ene, nylon,or teflon tubing. Each access tube is inserted into the loosened top portion of the tube connector located on the service- able end of the Soil Water Sampler.Tighten the fittings to finger tightness.We recommend using 2 different colors of tubing to dif- ferentiate between the two connectors in order to eliminate mis- takes in identifying the access tubes once the Sampler is placed in the soil. Soilmoisture offers both black and green polyethylene tubing,models 1903L and 1904L respectively. Pressure Testing Before We highly recommend pressure testing the complete Sampler as- Installation sembly prior to installation. Your prior testing will confirm the integrity of all joints and components. After allowing the ceramic portion of the Sampler to soak in water for approximately two hours,a sustained pressure of 20 psi can be applied to the submerged Sampler,associated tubing,and connec- tors. Continuous bubble formation indicates leakage and shows the exact location of any leak. Coring the Hole The Pressure-Vacuum Soil Water Sampler,Model 1920F1,may be installed at any depth up to a maximum of 50 feet. fit-,,.•_ , '� r t.; ... I , Figure 4a. Figure 4h In rock-free,uniform soils at shallow depths, use a 2-inch screw or bucket auger for coring the hole(Figure 4a).If the soil is rocky,a 4- inch auger should be used. The soil is then sifted (Figure 4b) through a 1/4-inch mesh screen to free it of pebbles and rocks./This SOIIMOISTURE EOUIPMENT CORP. 9 \® P.O.Box 30025, Santo Barbaro,Colifomio 93105 USA / \ Phone:(805)964-3525•Fox:(805)683-2189 s�� e-mail:soles®soilmolsture.com• Web:http://www.soilmoistufe.com