CA-69 was laid out on the master grid system established for the site (see TT-I, 1991, pg 173). A base line was shot with the transit which was situated at (53 W, 0 N). On this baseline, the two points (53 W, 32 N) and (53 W, 26 N) were established. Via triangulation the point (45 W, 26 N) was established. From that CA-67 was laid out and then the two Eastern coordinates of CA 69 were laid out from CA-67's Western line, and the Northern coordinates were established via triangulation.
The coordinates of the four corners of CA 69 upon commencing excavation were as follows:
NW corner: 32N/ 49W
NE corner: 32N/ 47W
SE corner: 27N/ 47W
SW corner: 27N/ 49W
A datum point with an absolute elevation of 28.63m was established on a tree located immediately to the east of trench.
Opening drawing of CA 69.
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