cam . { than i i o \ These data indicate that extended regions generally exceeding - 40 pCi/g probably are present on 11 islands,although the shape of the regions is uncertain because in many instances the distance between two samples hav- ing more than 40 pCi/g was either relatively large or it included a sample givin much less than 40 pCi/g. Another uncertainity resulted from the AEC survey employing more than one sample configuration. For example, the following concentrations are reported (Reference 2, Vol. II, Fig. B.15.1.i) for the top . 15 em of the profile #101 from Lujor (Pearl): 420 pCi/g at 0-2 cm, 115 pCi/g at 2-5 em, 5 pCi/g at 5-10 cm, and 2.7 pCi/g at 10-15 cm, while the "surface sample” #101 (covering the entire 0-15 cm) is given (Reference 2, Vol II, Fig. B.15.2g) ass ‘pCi/g- datory cleanup" The location thus could be listed as either “man- mease-by-case cleanup." . Ta ae Tee ee ee, ro ate “ue Ta: . “st yeu watea SO wal. aus we 77 GER OE ™ 5. ‘Although the paucity of data and the problems of comparing surface sample data with profile sample data prevent one from knowing with certainity the areas or volumes qualifying for Cleanup, the AEC Survey is considered suffi- cient to permit classifying the northern islands into two kinds of regions-one which probably has soil containing Pu at concentrations greater than 40pCi/ (high concentration) and the other as unlikely to have significant amounts of Pu at concentrations greater than 40 pCi/g (low concentration). The high ‘concentration regions are described inEnclosure 3. The low concentration regions include all of Biken (Leroy), the two groups of islands (1) Kidrinen (Lucy), Taiwel (Percy), Bokenelab (Mary) and Elle (Nancy) and (2) Bijire (Tilda) Lojwa (Ursula), Alembel (Vera) and Billae (Wilma), and the areas outside the high concentration regions for the other northern islands. i; tebeees ae .G2 05 FITS 6. During Cleanup, the high-concentration regions listed in Enclosure 3 will be reinvestigated 3n more detail than was done during the AEC Survey; e.g. whereas the AEC Survey averaged only about 1 sample per acre for <all northern islands, Cleanup will achieve at least 10 Samples per acre. The low concentration regions, although having Pu concentrationrangesgreater than ole are typical for the southern islands, do not include samples with Pu concentration in excess of 40 pCi/g. Thus, these areas might be considered as already complying with the AEC Task Group recommendations and not requiring any 76*+ soil Cleanup; however, they will be programmed for reinvestigation at about the same sample frequency as obtained by the AEC Surveyfor the purpose of confirming the apparent findings of no significant Pu contamination. If contrary data.are obtained; i.e. if Pu concentration is found to exceed 40 pci/s at any spot ina low-concentration region, then that area will be thoroughly investigated. - mo eo ee ; peor CM Lito ‘ a 4 7 | , — _ dedae f AMT ae Ne met y TH woteet AP . i Ty ~ Say - ae - ta Eee wevito.s) eke nee as oak oe eaomey gd taeha Cee leentiuns ba aurviscn 2 Z * x yo . Dae" vefA ORR . . wee ls PGA gellee TMB Get ~ te ts , we tee _ eee BIE nol Ms otsnéntige at bodtcay - enw t woh - Ne wa ut ;SMBS - : STI. ae on* arde as meric: hi “ Ny 7 o etnnyie ee, eg te OG OER we n R SOP SR Te ee et eeI wo - , . “ . . ” vo « - .! le art OF. : . . ei. o oe Spa ghot . . ' . . toa eT en ~ Nee PT t tte Ne