“18 -lé dq i2 10 8 6 4 ee‘ 2 Q 2 et| 4 6 | & 1 l2 14 i6 198 dE 20 ! 22 e4 26 28 30 | _— Nia —-Nie — NIG 5 APPROXIMATE HIGH TH i472 —— Nik = NO —~ OCEAN Ng — bee ~MN? 5 5 SANDHAR - BUILDUP SINCE 5 5 1972 | fhota Ny ee SIO) SALLY — AOMON Sc} o> SL? — Sa —— SIG ~~ S18 FIGURE 7-106. ISOPLETHS ON 99S; ACITIVTY IN pCi/g (AVERAGE IN TOP 40 CM) FOR ISLAND SALLY