EQUIPMENT - Incorrectly calibrated Soiltest, Inc., tapes. UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY WATER RESOURCES DIVISION WASHINGTON, D.C. 20242 February 12, 1968 4037 0001 GROUND WATER BRANCH TECHNICAL MEMORANDUM NO. 68.4 To: Regional Hydrologists and District Chiefs, WRD From: Chief, Ground Water Branch, WRD Subject: EQUIPMENT - Incorrectly calibrated Soiltest, Inc., tapes. The attached memorandum from Mr. L. B. Laird, District Chief, WRD, Tacoma, Wash., to the Chief Hydrologist is self-explanatory. Please see that all tapes in your district manufactured by Soiltest, Inc., are checked for correctness of calibration. (s) C. L. McGuinness Enclosure WRD DISTRIBUTION: A, B, S, FO, PO