TWIW 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) : Susan Jeffries Date Prepared : 2022-11-10 Report Type : UPDATE If Update: Previous Site Log : twiw_20200716.log Modified/Added Sections : (n.n,n.n,...) 1. Site Identification of the GNSS Monument Site Name : Windy West Four Character ID : TWIW Monument Inscription : IERS DOMES Number : (A9) CDP Number : (A4) Monument Description : SHALLOW FOUNDATION TOWER Height of the Monument : (m) Monument Foundation : (STEEL RODS, CONCRETE BLOCK, ROOF, etc) Foundation Depth : (m) Marker Description : NONE Date Installed : 2004-10-11 Geologic Characteristic : (BEDROCK/CLAY/CONGLOMERATE/GRAVEL/SAND/etc) Bedrock Type : (IGNEOUS/METAMORPHIC/SEDIMENTARY) Bedrock Condition : (FRESH/JOINTED/WEATHERED) Fracture Spacing : (1-10 cm/11-50 cm/51-200 cm/over 200 cm) Fault zones nearby : (YES/NO/Name of the zone) Distance/activity : (multiple lines) Additional Information : Site is located on deformation reflector tower : on the NE flank of Mt. St. Helens. Tower is : tripod shaped that stands approximately 3 m : tall. Legs are cemented into unconsolidated ash : and debris. 2. Site Location Information City or Town : Castle Rock State or Province : Washington Country : USA Tectonic Plate : North America Approximate Position (ITRF) X coordinate (m) : -2353892.9012 Y coordinate (m) : -3743895.7335 Z coordinate (m) : 4582832.8977 Latitude (N is +) : +461246.49 Longitude (E is +) : -1220931.44 Elevation (m,ellips.) : 1630.5 Additional Information : 3. GNSS Receiver Information 3.1 Receiver Type : TRIMBLE 5700 Satellite System : GPS Serial Number : 0220320153 Firmware Version : 2.01 Elevation Cutoff Setting : 0 deg Date Installed : 2004-10-11T00:00Z Date Removed : 2009-05-29T00:00Z Temperature Stabiliz. : none Additional Information : (multiple lines) 3.2 Receiver Type : TRIMBLE NETRS Satellite System : GPS Serial Number : 4808145646 Firmware Version : 1.2-5 Elevation Cutoff Setting : deg Date Installed : 2009-05-29T00:00Z Date Removed : 2010-06-03T00:00Z Temperature Stabiliz. : none Additional Information : (multiple lines) 3.3 Receiver Type : TRIMBLE NETRS Satellite System : GPS Serial Number : 4720132693 Firmware Version : 1.2-0 Elevation Cutoff Setting : deg Date Installed : 2010-06-03T00:00Z Date Removed : 2011-07-01T00:00Z Temperature Stabiliz. : none Additional Information : (multiple lines) 3.4 Receiver Type : JAVAD TRE_G3TH SIGMA Satellite System : GPS Serial Number : 00502 Firmware Version : 3.3.2 Jul,06,2011 Elevation Cutoff Setting : deg Date Installed : 2011-07-01T00:00Z Date Removed : 2012-08-10T21:36Z Temperature Stabiliz. : none Additional Information : (multiple lines) 3.5 Receiver Type : JAVAD TRE_G3TH SIGMA Satellite System : GPS Serial Number : 00502 Firmware Version : 3.4.5 Aug,07,2012 Elevation Cutoff Setting : 0 deg Date Installed : 2012-08-10T21:36Z Date Removed : 2016-03-30T23:50Z Temperature Stabiliz. : none Additional Information : (multiple lines) 3.6 Receiver Type : JAVAD TRE_G3TH SIGMA Satellite System : GPS+GLO+GAL Serial Number : 00502 Firmware Version : 3.6.3 Jul,01,2015 Elevation Cutoff Setting : 0 deg Date Installed : 2016-03-31T00:00Z Date Removed : 2016-07-20T23:00Z Temperature Stabiliz. : none Additional Information : (multiple lines) 3.7 Receiver Type : JAVAD TRE_G3TH SIGMA Satellite System : GPS+GLO+GAL Serial Number : 01330 Firmware Version : 3.6.6 Apr,27,2016 Elevation Cutoff Setting : 0 deg Date Installed : 2016-07-20T23:00Z Date Removed : 2019-04-23T23:59Z Temperature Stabiliz. : none Additional Information : (multiple lines) 3.8 Receiver Type : JAVAD TRE_G3TH SIGMA Satellite System : GPS+GLO+GAL Serial Number : 00456 Firmware Version : 3.6.13 Feb,12,2018 Elevation Cutoff Setting : 5 deg Date Installed : 2019-04-24T17:38Z Date Removed : 2020-07-15T17:00Z Temperature Stabiliz. : none Additional Information : (multiple lines) 3.9 Receiver Type : SEPT POLARX5 Satellite System : GPS+GLO Serial Number : 3052291 Firmware Version : 5.3.2 Elevation Cutoff Setting : 0 deg Date Installed : 2020-07-15T21:00Z Date Removed : 2021-07-28T18:27Z Temperature Stabiliz. : none Additional Information : (multiple lines) 3.10 Receiver Type : SEPT POLARX5 Satellite System : GPS+GLO Serial Number : 3052291 Firmware Version : 5.4.0 Elevation Cutoff Setting : 0 deg Date Installed : 2021-07-28T18:27Z Date Removed : 2022-11-09T21:18Z Temperature Stabiliz. : none Additional Information : (multiple lines) 3.11 Receiver Type : SEPT POLARX5 Satellite System : GPS+GLO Serial Number : 3052291 Firmware Version : 5.4.0-patch1 Elevation Cutoff Setting : 0 deg Date Installed : 2022-11-09T21:18Z Date Removed : (CCYY-MM-DDThh:mmZ) Temperature Stabiliz. : none Additional Information : (multiple lines) 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 : TRM41249.00 NONE Serial Number : 12337874 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 0.000 Marker->ARP North Ecc(m) : 0 Marker->ARP East Ecc(m) : 0 Alignment from True N : deg Antenna Radome Type : NONE Radome Serial Number : N/A Antenna Cable Type : (vendor & type number) Antenna Cable Length : (m) Date Installed : 2004-10-11T00:00Z Date Removed : 2010-07-13T00:00Z Additional Information : Mounted directly on cross bar 4.2 Antenna Type : TRM41249.00 UNKN Serial Number : 60111426 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 0.000 Marker->ARP North Ecc(m) : 0 Marker->ARP East Ecc(m) : 0 Alignment from True N : deg Antenna Radome Type : UNKN Radome Serial Number : N/A Antenna Cable Type : (vendor & type number) Antenna Cable Length : (m) Date Installed : 2010-07-13T00:00Z Date Removed : 2011-09-06T00:00Z Additional Information : Mounted directly on cross bar 4.3 Antenna Type : JAVRINGANT_DM SCIS Serial Number : 00506 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 0.000 Marker->ARP North Ecc(m) : 0 Marker->ARP East Ecc(m) : 0 Alignment from True N : (deg; + is clockwise/east) Antenna Radome Type : SCIS Radome Serial Number : N/A Antenna Cable Type : (vendor & type number) Antenna Cable Length : (m) Date Installed : 2011-09-06T00:00Z Date Removed : 2016-03-31T12:02Z Additional Information : Mounted directly on cross bar 4.4 Antenna Type : JAVRINGANT_DM SCIS Serial Number : 00506 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 0.000 Marker->ARP North Ecc(m) : 0 Marker->ARP East Ecc(m) : 0 Alignment from True N : (deg; + is clockwise/east) Antenna Radome Type : SCIS Radome Serial Number : 0494 Antenna Cable Type : (vendor & type number) Antenna Cable Length : (m) Date Installed : 2016-03-31T12:02Z Date Removed : (CCYY-MM-DDThh:mmZ) Additional Information : Mounted directly on cross bar. SCIS : replacement. SCIS replacement radome coated : with blue icephobic paint. 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 6.1 Standard Type : INTERNAL Input Frequency : Effective Dates : 2004-10-11/CCYY-MM-DD Notes : (multiple lines) 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 7.1 Instrumentation Type : NONE Status : (PERMANENT/MOBILE) Effective Dates : (CCYY-MM-DDThh:mmZ) Notes : (multiple lines) 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 : US Geological Survey Preferred Abbreviation : USGS Mailing Address : US Geological Survey : 1300 SE Cardinal Court, #100 : 5400 MacArthur Blvd. : Vancouver WA USA 98683 Primary Contact Contact Name : Michael Lisowski Telephone (primary) : 360-993-8933 Telephone (secondary) : Fax : 360-993-8980 E-mail : mlisowski@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 Boulder Facility Archive 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 : (multiple lines) Antenna Graphics with Dimensions JAVRINGANT_DM --------- / \ | | +-------------------------------------------------+ <-- 0.1015 TCR | | | | | | | | +-+-------------------------------------------------+-+ <-- 0.0379 +-------------------+-------------+-------------------+ <-- 0.0345 BCR | | | | +------x------+ <-- 0.0000 BPA=ARP <-- 0.3800 -->