Documents

Every census must adapt to the decade in which it is administered. New technologies emerge and change the way the U.S. Census Bureau collects and processes data. More importantly, changing lifestyles and emerging sensitivities among the people of the United States necessitate modifications to the questions that are asked. One of the most important changes for Census 2000 was the revision of the questions on race and Hispanic origin to better reflect the country’s growing diversity.

COVER ONLY

*Note: Documents with sensitive species information may not be available for download.

This technical memorandum was prepared to summarize results of drilling, construction, and testing at hydrologic test well HRES-13. The well was installed to characterize hydrogeologic conditions and provide a monitoring location in the western part of the Apache Leap Tuff (ALT) aquifer. Monitoring data obtained from HRES-13 have been incorporated into the RCM hydrologic monitoring program.

Arizona hedgehog cactus survey was conducted along areas proposed for pre-feasibility activities.

A series of flotation tests had been conducted at DML on the three individual composites that comprise MC-1. The initial scope of that test work was to evaluate if:

Rio Tinto is evaluating the Resolution Copper deposit located in Arizona. The main interest for this project is copper, with a secondary value in molybdenum. The principle objectives of this project were to:

Using a database of 655 recordings from 58 earthquakes, empirical response spectral attenuation relations are derived for the average horizontal and vertical component for shallow earthquakes in active tectonic regions. A new feature in this model is the inclusion of a factor to distinguish between ground motions on the hanging wall and footwall of dipping faults.

The maximum background earthquake (MBE) is the largest earthquake not associated with significant primary surface rupture. The MBE is estimated for the Basin and Range province considering 22 earthquakes from the province and a simple physical model of a circular rupture in the seismogenic zone.

This paper describes the development and application of a new method for generation of realistic synthetic earthquake time histories compatible with multiple-damping design spectra. The effectiveness of this new method is demonstrated by applying it to adjust actual earthquake time histories to match the design spectra while minimizing perturbations on their characteristics. The paper also demonstrates that seismic responses of structures based on such spectrum-compatible realistic time histories are consistent with those obtained from analyses using an ensemble of time histories.

The Colorado Plateau is a major tectonic and physiographic province in the southwestern United States which has been relatively stable during the Phanerozoic, but has been epeirogenically uplifted about 2 km in the Cenozoic.