AOMON CRYPT IMP MEASUREMENTS DOE/ERSP TECH NOTE NO. 17.0 DATED: 30 May 1979 AUTHOR: J. Jobst, EG&G On 24 May 1979 DOE was requested by JTG to obtain IMP measurements on 9 stake locations just south of the Aomon Crypt sheet pile enclosure. Previous measurements east of the enclosure indicated that the east approach was clean; hence, trucks were permitted to approach the enclosure from the east and dump Tilda sand into the evacuated enclosure. If similar results were obtained on the south side, JTG planned to open this as an additional truck route. The following data were obtained on 25 May 1979 by IMP I (detector 483). Stakes" 241 Am (pCi/g) TRU (pCi/g) 15,25-N-40 0.6 1.9 15-N-40,25 0.3 1.0 10-N-45.25 0.3 1.0 15.25-N-45 0.8 2.5 15-N-45.25 1.0 2.8 20-N-50 1.7 5.0 20-N-45. 25 3.2 9.5 20.25-N-45 25-N-40. 25 4.5 13.6 2.9 8.8 These data were accumulated at half-mast height (470 em) so a correction factor of 1.05 was included in the americium results noted above. Soil sample data close to the source of the fill material (Tilda lagoon beach) showed a TRU/Amratio of 3, which has been used to compute the last column. Since the TRU results are so low DOE indicated to J-3 (LTC Adeock) by radio, on 25 May, phatDOE had no objections to using a south approach to the Crypt which pass over the above stake ocations. B-17-1