PROGRAMS AND PLANS--Instructions for use of sediment samplers for the collection of samples to be analyzed for organic substances November 8, 1971 QUALITY OF WATER BRANCH TECHNICAL MEMORANDUM NO. 72.04 Subject: PROGRAMS AND PLANS--Instructions for use of sediment samplers for the collection of samples to be analyzed for organic substances Suspended sediments and bed material in streams, and bottom deposits in lakes and estuaries, often constitute sinks for toxic constituents that are sorbed on sediments. Quality of Water Branch Memoranda 71.05 and 71.09 have presented discussion and guidelines for sampling and analysis of water- quality constituents associated with these solid materials. In order to prevent contamination of such samples, however, much care must be taken before and during the collection procedure. River sampling for organics in bed material generally has been limited to those sites which can be waded, where samples of bed material could be collected using laboratory cleaned wide-mouth glass bottles. Capability for sampling both suspended sediment and bed material in deeper water is needed, however. In order to meet this need, the Branch staff has prepared the attached instructions for the use of standard sediment samplers in obtaining samples to be analyzed for organic substances. W.H. Durum Attachments 2 WRD Distribution: A,B.S,FO,PO