<p>From his office on the 25th floor of a downtown Sacramento high-rise, new state environmental chief Terry Tamminen is constantly reminded of all the prime urban development sites in California sitting idle due to toxic contamination.</p>
<p>Squarely in his field of vision is the former Union Pacific railyard, a heavily contaminated, 240-acre stretch of desolation the city of Sacramento hopes to see reborn as a new residential and commercial neighborhood.</p>