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These sites were chosen on the basis of their accessibility , soil characteristics , ground-water levels , and proximity to cleanup locales . The Reference section lists sources of information on basin hydrologic conditions , stream flow characteristics , ground-water resources , recorded water rights and their actual uses , water quality information and related long-range , multi-objective water resource opportunities . Three letters of reference attesting to the applicant 's personal qualities and characteristics , ability to complete a post baccalaureate program of studies and career potential and dedication to the field of Gerontology . The following list of characteristics , qualities , experiences , capabilities , interests , etc ., describe the ideal Board member . To evaluate the operation of the VSA and the validity and interpretation of the workability parameter it provides To modify the device and procedure as needed , based on the results of the evaluation To use the VSA on a range of concrete paving mixtures to determine which factors have a significant influence on workability of paving concrete PCCP team researchers evaluated the prototype VSA and tested it for operational characteristics , ruggedness , and ease-of-use . Due to their nonlinear current-voltage characteristics , resonant-tunneling devices are inherently bistable : they are capable of retaining the output states after the input signals change their values .