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California Department of Fish and Game Natural Diversity Database Full Condensed Report for Selected Elements-Multiple Records per Page Athene cunicularia burrowing owl Element Code:ABNSB10010 Status NDDB Element Ranks Other Lists Federal: None Global:G4 CDFG Status: SC State: None State:S2 Habitat Associations General: OPEN,DRY ANNUAL OR PERENIAL GRASSLANDS,DESERTS&SCRUBLANDS CHARACTERIZED BY LOW-GROWING VEGETATION. Micro:SUBTERRANEAN NESTER,DEPENDENT UPON BURROWING MAMMALS,MOST NOTABLY,THE CALIFORNIA GROUND SQUIRREL. Occurrence No.226 Map Index: 30891 EO Index: 4059 Dates Last Seen Occ Rank: Good Element: 1994-06-13 Origin: Natural/Native occurrence Site: 1994-06-13 Presence: Presumed Extant Trend: Unknown Record Last Updated: 1998-12-30 Quad Summary:Byron Hot Springs(3712176/463C),Clifton Court Forebay(3712175/463D) County Summary:Contra Costa LaULong: 37.83026°/-121.62792° Township: 01S UTM: Zone-10 N4187869 E620744 Range: 03E Radius: 1/5 mile Mapping PrecisionNON-SPECIFIC Section: 22 Qtr:SE Elevation: 100 ft Symbol Type:POINT Meridian: M Location:BYRON AIRPORT,1 MILE SOUTH OF BYRON HOT SPRINGS Location Detail:OWLS WERE PASSIVELY RELOCATED IN 1993 FROM AIRPORT EXPANSION CONSTRUCTION AREAS. Ecological:HABITAT CONSISTS OF ANNUAL GRASSLAND AND ALKALI WETLANDS IN THE VICINITY OF THE AIRPORT. Threat: THREATENED BY AIRPORT EXPANSION CONSTRUCTION. General: NO OWLS CAPTURED DURING AN EVENING OF TRAPPING IN 1993.12 ADULTS AND 9 JUVENILES WERE OBSERVED IN 1994.4 JUVENILE OWLS WERE BANDED FROM A COLONY OF 6 BREEDING PAIRS;THESE YOUNG WERE FROM PAIRS NESTING OUTSIDE THE RELOCATION AREA. Owner/Manager:CCA COUNTY Occurrence No.296 Map Index: 40040 EO Index: 35042 Dates Last Seen Occ Rank: Good Element: 1989-09-02 Origin: Natural/Native occurrence Site: 1989-09-02 Presence: Presumed Extant Trend: Unknown Record Last Updated: 1998-10-29 Quad Summary:Clifton Court Forebay(3712175/463D) County Summary:San Joaquin LaULong: 37.80819°/-121.55033° Township: 01S UTM: Zone-10 N4185523 E627611 Range: 04E Radius: 80 meters Mapping PrecisionSPECIFIC Section: 32 Qtr:XX Elevation: 5 ft Symbol Type:POINT Meridian: M Location:JUST WEST OF KELSO ROAD,0.9 MILE NORTH OF BYRON BETHANY ROAD INTERSECTION WITH KELSO RD,SE OF CLIFTON COURT FOREBAY. Location Detail:SITE IS LOCATED 50 YARDS WEST OF KELSO ROAD,IN AN OPEN,UNFARMED FIELD. Ecological:HABITAT CONSISTS OF AN OLD,UNFARMED FIELD WITH MOSTLY RUDERAL,WEEDY VEGETATION. General: 1 JUVENILE OBSERVED AT A BURROW SITE. Owner/Manager:PVT Occurrence No.317 Map Index: 40990 EO Index: 40990 Dates Last Seen Occ Rank: Poor Element: 1999-04-02 Origin: Natural/Native occurrence Site: 1999-04-02 Presence: Presumed Extant Trend: Unknown Record Last Updated: 1999-04-29 Quad Summary:Clifton Court Forebay(3712175/463D) County Summary:Alameda LaULong: 37.80942°/-121.56047° Township: 01S UTM: Zone-10 N4185646 E626716 Range: 04E Radius: 80 meters Mapping PrecisionSPECIFIC Section: 32 Qtr:XX Elevation: 15 ft Symbol Type:POINT Meridian: M Location:JOHN E.SKINNER FISH SALVAGE FACILITY,BYRON. Location Detail:BURROW IS LOCATED ON THE SOUTH SIDE OF THE MAIN ROAD USED TO ENTER THE FACILITY,ABOUT 10M THE CHAIN LINK FENCE ENTRANCE TO A MAIN PART OF THE FACILITY. Ecological:BURROW IS LOCATED ON A ROCKY ROADSIDE EMBANKMENT.TALL GRASSES GROW ABOUT 4-5M BEHIND THE BURROW. Threat: POSSIBLE THREAT FROM FUTURE WORK PROJECTS IN THE AREA. General: 2 ADULTS OBSERVED ON 2 APR 1999;UTILIZING A FORMER GROUND SQUIRREL BURROW. Owner/Manager:DWR Commercial Version--Dated May 01,2010--Biogeographic Data Branch Page 13 Report Printed on Thursday,July 01,2010 Information Expires 11/01/2010