Chaco Canyon (1991-1996)
 
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View of Pueblo Bonito, the largest of the "Great Houses" of Chaco as seen from the sandstone cliffs of the canyon. Photo: Guillermo Aldana.

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A detailed view of the ruins of Pueblo Bonito, one of the major Anasazi settlements in Chaco Canyon. Photo: Guillermo Aldana.

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A large kiva in the ruins of Casa Rinconada in Chaco Canyon. Photo: Guillermo Aldana.

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An autonomous, low-maintenance environmental monitoring station, designed by GCI staff, in an excavated kiva at Chetro Ketl, Chaco Canyon. Photo: Angelyn Bass.

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Po-Ming Lin of the GCI using a dielectric probe to test the moisture content in the soil at Pueblo Bonito. Photo: Guillermo Aldana.

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Installation of a horizontal geodrain above one of the unexcavated rooms at Pueblo Bonito. The purpose of the geodrain is to prevent infiltration of moisture from rain and snow. Photo: Neville Agnew.

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The geomembrane and geodrain at a test site in Pueblo Bonito is being covered over after installation. Photo: Guillermo Aldana.

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A winter view of the area of Pueblo Bonito where NPS-GCI tests were conducted. Photo: Po-ming Lin.

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Michael Taylor of the United States National Park Service (NPS) and Neville Agnew of the GCI examine a monitoring panel at Pueblo Bonito for indications of moisture infiltration. Photo: Martha Demas.

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Neville Agnew of the GCI and Michael Taylor of the NPS install temporary impermeable geomembranes to protect the tops of walls from water penetration and to eliminate the need for snow removal. Photo: Martha Demas.

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Central backfilled area of ruins at Chetro Ketl. Using the lessons learned from the backfilling and testing programs, the team implemented a backfilling procedure for partial reburial of Chetro Ketl ruins. Photo: Angelyn Bass.