The slope distance and the zenith angle between points A and B where the observed with a total station instrument as $9585\mathrm{.}26$ feet and $814220$ respectively. The H$.$I. and the rod reading $$r$$ were equal. If the elevation of A is $1238\mathrm{.}42$ ft$.,$ compute the elevation of B$.$ Consider the effect of the curvature and refraction correction. Hint: Hcr$=0\mathrm{.}0206$ m$2$ where M is in thousands of feet.