A series of 736 points were created from USGS lat/long data and moved to correspond with the DNR Hydro polygon layer. Not all points were moved, but where applicable, the distance and bearing of the move was documented. Each point was given a value in the DNR_CD field to describe the accuracy of the match to the DNR Hydro GIS layer. By virtue of the point being within the boundaries of the appropriate hydro polygon, users can create a spatial join or other spatial overlay that will allow them to apply the attributes of the USGS "Water Quality Samples for Washington" data to their polygon hydro layer of choice.
There is one table (usgs_sample_data_20050606) that relates to the main GIS feature class attribute table (usgs_sample_loc_20050606) using SITE_NO as the relate/join field. Usgs_sample_data_20050606 contains all the water quality parameters and results, and has separate metadata that describes only the attributes of the table.
While Philip Bloch is the primary contact for this dataset, Chris Snyder (WADNR) is avalable to answer questions about technical methodology. His email is email@example.com.