Ground water maps of the Hanford Site, June 1991

Ground Water Maps of the Hanford Site is a series of reports prepared semiannually to present water level measurements taken each June and December at the Hanford Site (Figure 1). Each report presents a compilation of the ground water level measurement data from the unconfined aquifer and selected confined aquifer wells collected during the subject month. The ground water data are also presented in graphic form in a series of ground water maps to illustrate the hydrologic conditions on the Hanford Site. The purpose of this document is to provide water level data to support many of the ground water monitoring programs on the Hanford Site. This report presents water level data measured in ground water monitoring wells on the Hanford Site during June 1991. The depth to the ground water was measured at the wellhead. The procedure for measuring the depth to water and recording the data is contained in environmental investigations instruction (EII) 10.2 of the Environmental Investigation and Site Characterization Manual, WHC-CM-7-7 (WHC 1988).