Correction to Office of Surface Water Technical Memorandum No. 93.01 In Reply Refer To: November 30, 1992 Mail Stop 415 OFFICE OF SURFACE WATER TECHNICAL MEMORANDUM 93.04 Subject: Correction to Office of Surface Water Technical Memorandum No. 93.01 The subject technical memorandum was a summary of documentation describing instrumentation and field methods for collecting sediment data. An attachment to the subject memorandum commented on "Guidelines for the Collection, Treatment, and Analysis of Water Samples, U.S. Geological Survey, Western Region, Field Manual." It might be implied from these comments that the 1/8-inch nozzle is recommended for use with the DH-81 and D-77 sediment samplers. The Office of Surface Water strongly discourages the use of an 1/8-inch nozzle with these samplers because of its generally poor hydraulic performance and its tendency to clog. Ernest F. Hubbard Assistant Chief Office of Surface Water WRD DISTRIBUTION: A, B, FO, PO