California state study finds 39,000 abandoned mines throughout the state. These mines, dating back to the 19th century, are safety hazards and can contaminate air and water.
"The danger of abandoned mines is becoming more evident as the population grows in high-density abandoned mine areas such as the Sierra Nevada foothills...Hazards can include old explosives, drums of chemicals, poisonous gases and runoff contaminated with chemicals such as mercury, arsenic, asbestos and chromium. "
Thanks to Abhijeet Chavan
FULL STORY: Legacy of Gold Rush: Many more dangerous shafts than thought

Planetizen Federal Action Tracker
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Urban Design for Planners 1: Software Tools
This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.
Planning for Universal Design
Learn the tools for implementing Universal Design in planning regulations.
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City of Camden Redevelopment Agency
City of Astoria
Transportation Research & Education Center (TREC) at Portland State University
Jefferson Parish Government
Camden Redevelopment Agency
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