SGDM Site Information Form (site log) International GNSS Service See Instructions at: https://files.igs.org/pub/station/general/sitelog_instr.txt 0. Form Prepared by (full name) : Ryan Turner Date Prepared : 2024-10-03 Report Type : UPDATE If Update: Previous Site Log : sgdm_20240409.log Modified/Added Sections : 1. Site Identification of the GNSS Monument Site Name : San Gabriel Dam Four Character ID : SGDM Monument Inscription : IERS DOMES Number : 49911M003 CDP Number : Monument Description : Wyatt/Agnew drilled-braced Height of the Monument : Monument Foundation : Foundation Depth : Marker Description : drilled hole in top of center support bolt on : scign d3 antenna adaptor Date Installed : 1999-11-02T00:00Z Geologic Characteristic : Bedrock Type : Bedrock Condition : Fracture Spacing : Fault zones nearby : Distance/activity : Additional Information : A secondary measurement, the adaptor/divot : distance, taken from the bottom of the lower : adaptor plate to the center of a divot drill- : mark on the north-facing tripod leg, is .1016m. 2. Site Location Information City or Town : Azusa State or Province : California Country : USA Tectonic Plate : Pacific Approximate Position (ITRF) X coordinate (m) : -2467931.8933 Y coordinate (m) : -4668655.8241 Z coordinate (m) : 3565569.8063 Latitude (N is +) : +341220.26 Longitude (E is +) : -1175142.13 Elevation (m,ellips.) : 420.7174 Additional Information : Los Angeles County. Reference frame used is : ITRF2000. Coordinate system used is WGS84. 3. GNSS Receiver Information 3.1 Receiver Type : ASHTECH Z-XII3 Satellite System : GPS Serial Number : LP03005 Firmware Version : CC00 Elevation Cutoff Setting : 10 deg Date Installed : 1999-11-02T00:00Z Date Removed : 2001-01-26T00:00Z Temperature Stabiliz. : Additional Information : 3.2 Receiver Type : ASHTECH Z-XII3 Satellite System : GPS Serial Number : LP03005 Firmware Version : CC00 Elevation Cutoff Setting : 10 deg Date Installed : 2001-01-26T00:00Z Date Removed : 2001-05-18T00:00Z Temperature Stabiliz. : Additional Information : Configuration Change: Sampling interval : decreased to 60 seconds...no telemetry to site. 3.3 Receiver Type : ASHTECH Z-XII3 Satellite System : GPS Serial Number : LP03005 Firmware Version : CC00 Elevation Cutoff Setting : 10 deg Date Installed : 2001-05-18T00:00Z Date Removed : 2003-07-31T18:21Z Temperature Stabiliz. : Additional Information : Configuration Change: Sampling interval : increased to 30 seconds...but still no telemetry : to site. 3.4 Receiver Type : ASHTECH UZ-12 Satellite System : GPS Serial Number : UC1200303009 Firmware Version : CN00 Elevation Cutoff Setting : 10 deg Date Installed : 2003-07-31T18:21Z Date Removed : 2007-11-06T00:00Z Temperature Stabiliz. : Additional Information : 3.5 Receiver Type : ASHTECH UZ-12 Satellite System : GPS Serial Number : ZR520022310 Firmware Version : CJ00 Elevation Cutoff Setting : 0 deg Date Installed : 2007-11-06T00:00Z Date Removed : 2008-01-07T17:25Z Temperature Stabiliz. : Additional Information : 3.6 Receiver Type : ASHTECH UZ-12 Satellite System : GPS Serial Number : UC1200303010 Firmware Version : CN00 Elevation Cutoff Setting : 0 deg Date Installed : 2008-01-07T17:25Z Date Removed : 2009-10-22T19:07Z Temperature Stabiliz. : Additional Information : 3.7 Receiver Type : TRIMBLE NETRS Satellite System : GPS Serial Number : 4927175310 Firmware Version : 1.2-5 22OCT2007 Elevation Cutoff Setting : 0 deg Date Installed : 2009-10-22T19:26Z Date Removed : 2016-05-25T18:50Z Temperature Stabiliz. : Additional Information : 3.8 Receiver Type : TRIMBLE NETRS Satellite System : GPS Serial Number : 4927175310 Firmware Version : 1.3-2 30OCT2016 Elevation Cutoff Setting : 0 deg Date Installed : 2016-05-25T19:00Z Date Removed : 2022-03-25T19:12Z Temperature Stabiliz. : Additional Information : 3.9 Receiver Type : SEPT POLARX5 Satellite System : GPS+GLO+GAL+SBAS Serial Number : 3052299 Firmware Version : 5.4.0 Elevation Cutoff Setting : 0 deg Date Installed : 2022-03-25T20:12Z Date Removed : (CCYY-MM-DDThh:mmZ) Temperature Stabiliz. : Additional Information : 3.x Receiver Type : (A20, from rcvr_ant.tab; see instructions) Satellite System : (GPS+GLO+GAL+BDS+QZSS+SBAS) Serial Number : (A20, but note the first A5 is used in SINEX) Firmware Version : (A11) Elevation Cutoff Setting : (deg) Date Installed : (CCYY-MM-DDThh:mmZ) Date Removed : (CCYY-MM-DDThh:mmZ) Temperature Stabiliz. : (none or tolerance in degrees C) Additional Information : (multiple lines) 4. GNSS Antenna Information 4.1 Antenna Type : ASH701945B_M SCIT Serial Number : CR519991822 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 0.0083 Marker->ARP North Ecc(m) : 0 Marker->ARP East Ecc(m) : 0 Alignment from True N : Antenna Radome Type : SCIT Radome Serial Number : 0052 Antenna Cable Type : Antenna Cable Length : Date Installed : 1999-11-02T00:00Z Date Removed : 2022-03-25T19:12Z Additional Information : Antenna height was corrected from 0.083 on : 07/22/2003. Antenna epoch overlaps with CACT. : This is the correct S/N for the antenna removed : on 2022-03-25. 4.2 Antenna Type : TWIVC6050 SCIT Serial Number : VC6150L1910310011 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 0.0083 Marker->ARP North Ecc(m) : 0 Marker->ARP East Ecc(m) : 0 Alignment from True N : Antenna Radome Type : SCIT Radome Serial Number : 4035 Antenna Cable Type : Antenna Cable Length : Date Installed : 2022-03-25T20:12Z Date Removed : (CCYY-MM-DDThh:mmZ) Additional Information : 4.x Antenna Type : (A20, from rcvr_ant.tab; see instructions) Serial Number : (A*, but note the first A5 is used in SINEX) Antenna Reference Point : (BPA/BCR/XXX from "antenna.gra"; see instr.) Marker->ARP Up Ecc. (m) : (F8.4) Marker->ARP North Ecc(m) : (F8.4) Marker->ARP East Ecc(m) : (F8.4) Alignment from True N : (deg; + is clockwise/east) Antenna Radome Type : (A4 from rcvr_ant.tab; see instructions) Radome Serial Number : Antenna Cable Type : (vendor & type number) Antenna Cable Length : (m) Date Installed : (CCYY-MM-DDThh:mmZ) Date Removed : (CCYY-MM-DDThh:mmZ) Additional Information : (multiple lines) 5. Surveyed Local Ties 5.x Tied Marker Name : Tied Marker Usage : (SLR/VLBI/LOCAL CONTROL/FOOTPRINT/etc) Tied Marker CDP Number : (A4) Tied Marker DOMES Number : (A9) Differential Components from GNSS Marker to the tied monument (ITRS) dx (m) : (m) dy (m) : (m) dz (m) : (m) Accuracy (mm) : (mm) Survey method : (GPS CAMPAIGN/TRILATERATION/TRIANGULATION/etc) Date Measured : (CCYY-MM-DDThh:mmZ) Additional Information : (multiple lines) 6. Frequency Standard 6.x Standard Type : (INTERNAL or EXTERNAL H-MASER/CESIUM/etc) Input Frequency : (if external) Effective Dates : (CCYY-MM-DD/CCYY-MM-DD) Notes : (multiple lines) 7. Collocation Information 7.x Instrumentation Type : (GPS/GLONASS/DORIS/PRARE/SLR/VLBI/TIME/etc) Status : (PERMANENT/MOBILE) Effective Dates : (CCYY-MM-DD/CCYY-MM-DD) Notes : (multiple lines) 8. Meteorological Instrumentation 8.1.x Humidity Sensor Model : Manufacturer : Serial Number : Data Sampling Interval : (sec) Accuracy (% rel h) : (% rel h) Aspiration : (UNASPIRATED/NATURAL/FAN/etc) Height Diff to Ant : (m) Calibration date : (CCYY-MM-DD) Effective Dates : (CCYY-MM-DD/CCYY-MM-DD) Notes : (multiple lines) 8.2.x Pressure Sensor Model : Manufacturer : Serial Number : Data Sampling Interval : (sec) Accuracy : (hPa) Height Diff to Ant : (m) Calibration date : (CCYY-MM-DD) Effective Dates : (CCYY-MM-DD/CCYY-MM-DD) Notes : (multiple lines) 8.3.x Temp. Sensor Model : Manufacturer : Serial Number : Data Sampling Interval : (sec) Accuracy : (deg C) Aspiration : (UNASPIRATED/NATURAL/FAN/etc) Height Diff to Ant : (m) Calibration date : (CCYY-MM-DD) Effective Dates : (CCYY-MM-DD/CCYY-MM-DD) Notes : (multiple lines) 8.4.x Water Vapor Radiometer : Manufacturer : Serial Number : Distance to Antenna : (m) Height Diff to Ant : (m) Calibration date : (CCYY-MM-DD) Effective Dates : (CCYY-MM-DD/CCYY-MM-DD) Notes : (multiple lines) 8.5.x Other Instrumentation : (multiple lines) 9. Local Ongoing Conditions Possibly Affecting Computed Position 9.1.x Radio Interferences : (TV/CELL PHONE ANTENNA/RADAR/etc) Observed Degradations : (SN RATIO/DATA GAPS/etc) Effective Dates : (CCYY-MM-DD/CCYY-MM-DD) Additional Information : (multiple lines) 9.2.x Multipath Sources : (METAL ROOF/DOME/VLBI ANTENNA/etc) Effective Dates : (CCYY-MM-DD/CCYY-MM-DD) Additional Information : (multiple lines) 9.3.x Signal Obstructions : (TREES/BUILDINGS/etc) Effective Dates : (CCYY-MM-DD/CCYY-MM-DD) Additional Information : (multiple lines) 10. Local Episodic Effects Possibly Affecting Data Quality 10.x Date : (CCYY-MM-DD/CCYY-MM-DD) Event : (TREE CLEARING/CONSTRUCTION/etc) 11. On-Site, Point of Contact Agency Information Agency : USGS Southern California Geodetic Network Preferred Abbreviation : SCGN Mailing Address : 525 South Wilson Avenue. Pasadena, CA 91106 Primary Contact Contact Name : USGS SCGN Operators Telephone (primary) : 650-329-4677 Telephone (secondary) : Fax : E-mail : scgn-operators@usgs.gov Secondary Contact Contact Name : Telephone (primary) : Telephone (secondary) : Fax : E-mail : Additional Information : (multiple lines) 12. Responsible Agency (if different from 11.) Agency : Preferred Abbreviation : Mailing Address : Primary Contact Contact Name : Telephone (primary) : Telephone (secondary) : Fax : E-mail : Secondary Contact Contact Name : Telephone (primary) : Telephone (secondary) : Fax : E-mail : Additional Information : (multiple lines) 13. More Information Primary Data Center : UNAVCO Secondary Data Center : URL for More Information : https://www.unavco.org Hardcopy on File Site Map : (Y or URL) Site Diagram : (Y or URL) Horizon Mask : (Y or URL) Monument Description : (Y or URL) Site Pictures : (Y or URL) Additional Information : Antenna Graphics with Dimensions https://files.igs.org/pub/station/general/antenna.gra