28 Nov 77 1977 October 4-5 Cleanup, Chairman's Report - Conference on Runit FCZ SUBJECT: e. Using backhoes, FRST, and other resources as available, perform soil profiling surveys in the central area (between FIG/QUINCE and Cactus crater areas) where no profile data is currently available. Ten to 15 profiles should be sufficient. Location and spacing of the sampling sites must be coordinated between JTG and ERSP and must lie on the 50 meter grid lines or agreed subdivisions thereof. Sampling locations selected must directly contribute to data required for cleanup survey and for certification. This effort should be initially limited to those areas selected for stockpiling contaminated debris and contaminated soil. (See h and i below for sampling techniques and analyses.) £. Using backhoes, FRST, and other resources as available, perform soil profiling surveys in the FIG/QUINCE and Cactus crater areas. Sample locations and spacing must be coordinated between JTG and ERSP and must lie on the 50 meter grid lines or agreed subdivisions thereof. Sampling locations, insofar as possible, must be directly contributory to data needed for cleanup survey and for certification. This effort is intended to determine the physical limits of the subsurface contamination pockets indicated by soil sample data at sample points AEC 104, 111, 112; USAF-EPA 16, 12-1; and USAF-RHL 8, 15, 32, 10, 31, 27 and 9. If possible, this profiling effort should await completion of the in-situ survey of d above, but this is not a necessity. Profiling can be done before or concurrent with the in-situ effort. It is envisioned that this profiling effort will use iterative "one-half distance" techniques to establish the size of the subsurface pockets showing contamination levels in excess of 400 pCi/g PU 239/240. (Use of the "one-half distance” technique should not imply that the contamination can be characterized by a mathamatically continuous function. Random discontinuities must be expected. See Encl 1.) g. AS resources permit, continue soil profiling in other areas in northern half of Runit. Sample locations and spacing should be directly contributory to data needed for cleanup survey and for certification as well as characterization. Additional samples should be taken in each of the three’ areas, FIG/QUINCE, Cactus crater, and the central area. The objective is to further the assurance of presence or absence of subterranian contamination. If pockets of contamination are found they should be defined as in f above. h. Soil profiling operations will be subject to continuing coordination between JTG and ERSP to ensure maximum usability of data obtained. In general, a profile site depth of 120 cm will be sufficient. However, condi- tions may dictate greater depth, particularly near Ground Zero locations eyaS, Ot vows ° ser - - - . 7 PESTS vik ‘ We AS PCA wmweoMernar tip imame eet MN ep v. oo wAguet wh a an . Poa yg tee mye vets,