year  month  day  site           side  lat_WGS84  lon_WGS84    
2002  8      7    WESTON         DC    36.510347  -121.945786  
2002  8      7    WESTON         UC    36.512613  -121.948765  
2002  9      4    WESTON         DC    36.510347  -121.945786  
2002  9      4    WESTON         UC    36.512613  -121.948765