362 RADIOLOGICAL CLEANUP OF ENEWETAK ATOLL c. Preserve the capability to execute the sheet pile containment Option All sheet pile and other necessary supplies and equipment needeq to execute that option would be obtained and shippedto the atoll on the next barge. d. Provide a desilting capability for removing suspendedparticles from water. e. Complete the project, including backfilling and backfill profile samples, not later than 30 May 1979. During the meeting, DOE representatives, in concert with Field Commandrepresentatives, provided radiological guidance as follows: a. Debris will be recovered throughout the crypt. b. An attempt will be made to excavate transuranic concentrations exceeding 400 pCi/g at any depth encountered. Water-saturateg samples will be filtered and field scanned. c. Sediments will be sampled at predesignated grid nodes and analyzeq using field techniques to document activity at the final eXCavated depth. Each grid will be 5 meters on a side (25 square meters). d. After backfilling has been accomplished, profile samples will be collected at the sampling nodesto a depth of 180 centimeters. The core profile samples collected will be homogenized and aliquoted, yielding one concentration value representing that grid to ensurethat values do not exceed 400 pCi/g. e. Recovered contaminated soil piles and debris will be samples and monitored to obtain an estimated inventory of radioactive material recovered. CRYPT SURVEYS: NOVEMBER 1978 Based cn instructions from the 8 November 1978 conference,a 5-by-5- metergrid was established by DOE-ERSP and wassurveyed and staked by a USAEsurveyor. This grid, shown in Figure 7-28, was used for all subsequent surveys and operations in the Aomon Crypt. The surface of the Aomon Crypt was surveyed by DOE-ERSP using the IMP on 25metergrid. No surface readings above 40 pCi/g were found.46 A magnetic survey4? of the Aomon Crypt was carried out by U.S. Oceanography of Honolulu, Hawaii, during the period 17-20 November 1978. A proton procession magnetometer with a dual sensing element ona 30-meter cable was used to determine the location and amountofferric material buried in the crypt area. Positioning was accomplished using the 5-by-5-meter grid system established by the USAEsurveyor. To obtain an average reading for the total field intensity of the area, approximately 20 readings were made outside the grid area, in locations ba _ ~ ere