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• although five units, 2 x 2 meters in size, were recormended. This <br />flexibility, therefore, would enable the field director to emplace <br />2 x 2 meters, 1 x 1 meter, 2 x 1 meters, or whatever other configura- <br />tion of test pit in those locales seemed appropriate. <br />Despite the reduction of the area of concern at SKP139 from the expan- <br />sive 550 meters x 450 meters to the more manageable proportions of <br />60 meters x 90 meters, the problan still n~mainad of deciding where to <br />locate the test pits so that the most infoanation wuld be gained. <br />Given this dileirtna, it seemed most appropriate and practical to utilize <br />the two backhce trenches (B.T. 1 and B.T. 4) which were dug in the area <br />and had exposed a number of features. Thus, four test pits or excavation <br />units (EU's) were established straddling the test trench and including <br />within their confines any feature identified by the testing operations. <br />Because the test trench was incoxporated within the boundaries of each <br />EU, the area of actual excavation varied from unit to unit according to <br />• the width of the trench. These EU's were numbered sequentially EU1-EU4; <br />a fifth 2 x 2 meter unit was reserved at the outset so that it mold be <br />placed judiciously dependent upon the results of the excavations of the <br />other four units. Eventually, two additional 1 x 2 meter units (ECTS and <br />EU6) were excavated. A1ans 3 and 4 shwa the general locations of all <br />six excavation units and Appendix: Figures 10 to 18 illustrate the <br />appearance of these units prior to excavation. <br />Before work caRnenceci in the excavation units, two stratigraphic profiles <br />were dug along the backhoe trenches so that the depths and c~sitions <br />of all natural layers mold be ascertained. Both profiles are approxi- <br />mately 1 meter in width and dug fran the present ground surface (PGS) to <br />the bottan of the test trench. Stratigraphic profile 1 was located along <br />the west wall of backhce trench 4, 21.5 m frrm the south end of the trench. <br />Stratigraphic profile 2 was placed along the south wall of backhoe trench 1, <br />13 m west of the juncture between backhoe trench 1 and backhoe trench 4. <br />These profiles determined the existence of at least three natural strata, <br />• the top layer distinguished into two subunits. Descriptions of ead-i layer <br />and subunit are provided in Table 5; Figures 3, 4, and 5 illustrate the <br />23 <br />