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• to soils which have accumulated arsenic through foliar spray compounds. The arsenates are fixed <br />by soils in a relatively insoluble state and are not lost by leaching. The critical water-soluble arsenic <br />concentration in soils is 2 ppm (USDA, 1957). <br />Parameter Selection -Phase II <br />Overburden parameters for the second phase sampling were selected after reviewing the Phase <br />I data. Constituents which approached or exceeded marginally suitable to unsuitable guideline <br />levels during Phase I sampling were included on the Phase II analyses list. Those constituents <br />which were below detection limits were naturally omitted from the Phase II analyses list. <br />Phase I overburden sampling and analyses results for the New Horizon 2 study area were <br />presented to the Division on June 22, 1987 (meeting, G. Wendt and S. Renner). A letter of <br />agreement for the Phase II monitoring plan was subsequently submitted to the Division on July 6, <br />1987 (letter, G. Wendt to P. O'Connor) and approved by the Division on August 4, 1987 (letter P. <br />O'Connor to J. Lunan). <br />• Laboratory parameters included paste pH, ammonium nitrogen, sodium adsorption ratio, and Acid <br />base potential. Phase II SAR analyses were confined to Sites 881 E and 882E since elevated SAR <br />values were identified only at Site 872E during Phase I drilling. <br />Analytical Procedures - Phase I and Phase II <br />At the lab (InterMountain Lab, Farmington, New Mexico), chip samples and cores were air dried, <br />split, and composited according to lithologic and stratigraphic sequence, crushed to pass a 10 <br />mesh sieve, and bagged for storage. Prior to splitting and crushing intact cores, foreign material <br />attached to the outside of the core was removed. Overburden chip samples from Phase I Site <br />871 E were collected from 2-foot vertical increments. Adjacent 2-foot chip samples of similar strata <br />were composited into 4- and 6-foot vertical increments prior to laboratory analysis. Phase II <br />overburden chip samples were composited by similar strata while geologic descriptions were <br />prepared during field sampling. All samples from the three Phase I cores and three Phase II <br />combinationcore/bore holes were chemically and physically analyzed at InterMountain Laboratory <br />• REVISED August 2006 2.04.6-24 <br />