Digital data for construction material sources reported by the Arizona Department of Transportation in 1977 for Maricopa County, Arizona

The data set marpits1 is an ArcInfo coverage of point features
representing pit locations and attribution data captured from
an atlas of map sheets and pit data sheets titled "A Materials
Inventory of Maricopa County [Arizona]" by the Arizona Highway
Department (AHD), now named the Arizona Department of
Transportation (ADOT), hereafter referred to as the 'Source'.
Pit locations were represented by point symbols in the Source
map sheets. Points were digitized from the Source map sheets.
Selected attribute data were collected from the Source pit data
and map sheets. In the Source introduction it states:
> "The pit location maps show the location of all
> pits bearing Materials Services serial numbers.
> Other sources are not shown. The plotted locations
> are as close as possible to the true location
> as the scale of the map will allow."
The point attribute data, captured from the Source pit
data sheets are
> "designed to show test results (sieve analysis,
> plasticity index, and abrasion) for the usable
> material within each ADOT pit."