TRITIUM ANALYSES - Background Samples Collected in 1961-62. UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY Water Resources Division Washington 25, D.C. In reply refer to: October 14, 1964 Code: 4056 0001 GROUND WATER BRANCH MEMORANDUM NO. 65.7 To: District Chiefs and Staff Officials, GWB From: Chief, Ground Water Branch Subject: TRITIUM ANALYSES - Background Samples Collected in 1961-62. In the fall of 1961, District Chiefs were requested to collect and store three well-water samples for information on back-ground tritium levels. In the spring of 1962, subsequent to intensive nuclear testing, it was requested that the shallowest well be resampled. The Tritium Laboratory of the Quality of Water Branch is prepared to analyze part of this national sampling and you are requested to send the suite of four samples as soon as possible. The samples should be carefully packed and shipped to the following address by Railway Express, using the standard GBL with charges to Account No. 5-450004: U.S. Geological Survey Tritium Laboratory Room 102, Old Post Office Building 12th and Pennsylvania Ave. Washington, D.C. If the samples are no longer available for any reason, please inform us. (s) O. M. Hackett WRD Distribution: A, B, S3, FOL3, SL