1.12 Other Continental United States Sites Monthly fallout collectors are maintained at other sites within the continental United States, Exposed surfaces of the collectors are 0.82 ft© except at Lemont, Illinois (0.75 ft@) and Richmond, California (91 ft). Table 2 up=dates data for monthly collections appearing in HASL-2, "Environmental Contamination from Weapon Tests". The $r99/sr90 ratios have been extrapolated to the midpoint of the collection period. Explanation of Error Terms in Table @ {1} The error term in the column "me Sr70fee is the standard error of sountinge (2) The "average mc Sr3C/mi=" column is computed from either the standard error of duplicate analyses or the standard error of counting, whichever is greater. This coiumn appears only when duplicate collections are made at a site. (3) The larger errer term (or always the counting error where only one analysis has been nade) is then used to compute the cumulative error.