Table 1.

Summary of Historical Water-Quality Databases Used for Investigation in the Modesto and Albuquerque Study Areas

StudyArea	Source/Collecting Agency	Total Number of Wells	Range of Well Depth (mbls)	Range of Length of Screened Interval (m)	Range of Depth to Water (mbls)	Years of Data Collection	Typical Frequency of Data Collection	Types of Available Water-Quality Data	Availability of Pumping Data
Modesto, CA	City of Modesto	138	18-125	0.3–91.5	<3–20	1984–2008	Annual to quarterly	Major, minor, and trace elements; Nutrients Field measurements	Monthly for aggregated wells
Albuquerque, NM	Albuquerque Bernalillo County Water Utility Authority	95	152–544	43–309	3.4–234	1988–2005	Annual to biannual	Major, minor, and trace elements;Nutrients Field measurements	Monthly for individual wells