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0 D 4874 <br /> ' S. Sampling 10.1.2 Moisture Content—Adjust the moisture content to <br /> 8.1 Sampling must be performed so as to obtain a that defined in the disposal scenario by dewatering or adding <br /> representative sample of the material. reagent water to the material. Increase moisture content to <br /> ' 8.2 Where no specific sampling methods are available, that defined in the disposal scenario by addition of reagent <br /> sampling methods for materials of physical form similar to water.Note and record the volume of reagent water added. If <br /> the material shall be used. the concentration of any trace analyte of concern found in <br /> 8.3 A minimum sample of 5000 g, or three column the reagent water exceeds the reporting (quantitation) limit <br /> ' volumes, whichever is larger, shall be sent to the laboratory for the volume added,note this on the report form.Decrease <br /> for each column. moisture content by determining scenario temperature(nor- <br /> 8.4 Samples must be kept in closed containers appropriate mally Ices than 60'C) and drying the material at the <br /> to the sample type and otherwise protected if necessary prior temperature for a specified time interval. Determine actual <br /> to testing to prevent sample contamination or constituent moisture content of the waste as it is placed in the column <br /> change or loss. Where it is desired to test biologically or using Test Method D 2216 and an appropriate drying <br /> chemically active samples in their existing state, any sample temperature. Note and record the drying temperature used. <br /> ' storage required should be at 4'C(Practice D 3370)and the Record the moisture content. <br /> leaching should be started within 8 h of sample collection. 10.1.3 Density—Density is to be adjusted by vibration <br /> Where appropriate, the tester may modify a test portion (see Test Method D 4253)or compaction (see Test Method <br /> before leaching to simulate the results of biological or D 698) to the anticipated field density. Pack the waste <br /> ' chemical activity in the field. Record the storage conditions, material in the column so that uniform density is achieved. <br /> sampling procedures, handling practices, and any abnormal This can be checked by visual observation of the waste in the <br /> sampling conditions in the report transparent column. <br /> 10.1.4 Curing—Aging may be necessary for those mate. <br /> , 9. Preparation of Apparatus rials that undergo physical or chemical changes with time in <br /> 9.1 The assembled apparatus is shown in Fig 1. order to obtain a specimen (test portion) representative of <br /> 9.2 Column Preparation: the desired conditions. Curing may be accomplished in the <br /> 9.2.1 Before use, clean all parts of the test apparatus that field before testing in the column to produce a physical and <br /> ' will contact the waste material, leaching fluid, or product chemical state representative of the waste as it undergoes <br /> leachate. leaching in the field. Note and record field conditions of <br /> 9.2.1.1 Clean the entered disks by boiling them for 15 temperature, humidity, and atmospheric pressure. Record <br /> min in reagent water, followed by a backfiush with reagent the duration of the curing process and report with the test <br /> ' water. Then saturate the disks with concentrated sulfuric data. <br /> acid and soak until all residues are removed. Then vacuum 10.1.5 Particle Size—Ensure that the particle size distri- <br /> or pressure remove the excess acid with reagent water. Next, bution of the waste as placed in the column is representative <br /> pump or draw either acetone or methanol through the disks, of that expected in field placement. Interpretation of resu]U <br /> ' followed by either hexane or methylene chloride. Permit is based in part on a knowledge of the panicle size distribu- <br /> disks to air dry. tion and surface area of the material. Maximum particle <br /> 9.2.1.2 Clean the column apparatus by washing it with a diameter must not exceed rAo of the inside diameter of the <br /> nonionic surfactant soap and water. Rinse with tap water column Particle size reduction is not recommended. An <br /> ' and follow with a reagent water muse. Then rinse it with evaluation of the particle characteristics of size distribution <br /> either acetone or methanol, followed by a rinse with either and surface area may be useful. Test Methods D 422 and <br /> hexane or methylene chloride. Permit the apparatus to air C 819 should be used to evaluate these properties or the <br /> dry. waste. <br /> 9.3 Assemble the apparatus as depicted in Figs. I and 2. 10.2 Column Filling: <br /> Weigh the dried, clean empty column, including end caps 10.2.1 Fill the column by compacting or vibrating the <br /> and other fittings necessary to contain the waste,and record waste in five approximately equal layers. Approximate the <br /> ' the mass.This is the tare of the apparatus. Record the inside expected field density. Scarify the top surface of each layer <br /> diameter and height of that pan of the column to be filled before adding the next increment Do not scarify the top <br /> with waste (that is, the column cylinder). If, following layer after final compaction. Fill the column to its final <br /> column saturation, the tester wishes to check the degree of height, ensuring that the final height of the compacted <br /> saturation,it will first be necessary to determine the mass of material is equal to the height of the leaching column. <br /> water that can be contained in the porous flow distribution 10.2.2 After filling the column, determine the maser, <br /> disks,cod plates,and fittings. including the same fittings as in the determination of the <br /> tare. Record the total man. <br /> ' 10. Procedure 10.3 Leaching: <br /> 10.1 Preconditioning: 10.3.1 The leaching process is conducted in a continuous <br /> 10.1.1 Prepare a test portion of waste in a manner that up-Bow mode. <br /> simulates the state the waste is in or will be in as it undergoes 10.3.2 Saturarion—After assembling the column as <br /> ' leaching in the field. Preparation of the test portion may shown in Fig. 1, saturate the column with reagent water b <br /> include such factors as curing, and adjustment of moisture the method outlined in Test Method D 2434 for determining <br /> content and density. For such adjustment; the following permeability coefficients using a constant head permea- <br /> ' procedures can be used where appropriate. meter. in this case, the column assembly replaces the <br /> 4 <br /> 1 <br />