An internal sample label (fig. 10) is filled out and placed in the sample container. This label is printed or photocopied on plastic or 100-percent rag, acid-neutralized paper using formalin- and alcohol-resistant inks. All spaces for information on the label are filled in using a pencil or rapidograph containing water-, formalin-, and alcohol-resistant ink. The site names and site identification numbers entered on the labels correspond to official USGS station names and station identification numbers assigned to the basic fixed sites, typically a site name and number for an existing gaging station. The date of collection is entered in two-digit format as month, day, and year. The proportion of the sample retained for processing (subsample) and the names of the people responsible for collecting the sample are entered in the proper place on the label. The appropriate information regarding sample type and mesh size is circled and the sample-identification code entered.
