CHWK Site Information Form
     International GPS Service


0.   Form

     Prepared by (full name)  : Michael Schmidt
     Date Prepared            : 17-NOV-1998
     Report Type              : NEW
     Prepared Using           :


1.   Site Identification of the GPS Monument

     Site Name                : Chilliwack
     Four Character ID        : CHWK
     Monument Inscription     : 987020

     IERS DOMES Number        : 40142M001
     CDP Number               :
     Date Installed           : 17-NOV-1998
     Geologic Characteristic  : crushed gravel on bedrock (see below)
       Bedrock Type           : covered by gravel - see below
       Bedrock Condition      : see below
       Fracture Spacing       : see below
       Notes                  : see below
     Additional Information   : This station is part of the Western Canada
                              : Deformation Array (WCDA) as well as the
Canadian
                              : Active Control System (CACS). The following
                              : information is current as of 17-NOV-98:
                              :
************************************************
                              : The GPS reference mark consists of a
stainless
                              : steel plate with a forced centred bolt. The
                              : stainless steel plate is the top surface of
a
                              : stainless steel pedestal mounted on top of a
                              : concrete water reservoir. The pedestal is
                              : 1.2 metres high, 15.2 cm in diameter.
                              : The antenna is fastened to the pedestal
using a
                              : tamper resistant mechanism which permits
                              : orientation of the antenna.
                              : The antenna and choke ring assembly are
protected
                              : by an acrylic dome.
                              : The water reservoir is constructed on top of
a
                              : compacted layer of gravel, situated on top
of
                              : bedrock and compacted till.
                              : The stainless steel GPS pedestal is attached
to the
                              : concrete using stainless steel threaded rod
and
                              : epoxy based grout. The pedestal is mounted
over
                              : one of four support columns within the
reservoir.
                              : Please see contact information below for
                              : more information regarding the GPS antenna
                              : pedestal, tamper resistant mecahnism, etc..

2.   Site Location Information

     City or Town             : Chilliwack
     State or Province        : B.C.
     Country                  : Canada
     Tectonic Plate           : North America
     Approximate Position
       X coordinate (m)       : -2215259.850
       Y coordinate (m)       : -3543997.170
       Z coordinate (m)       : 4802099.000
       Latitude (deg)         : +49.1566
       Longitude (deg)        : +237.9916
       Elevation (m)          : +170
     Additional Information   :


3.   GPS Receiver Information

3.1  Receiver Type            : ROGUE SNR-8000
     Serial Number            : 297
     Firmware Version         : 3.2 link 1995/03/09
     Date Installed           : 17-NOV-1998 23:00 UT
     Date Removed             :
     Additional Information   : Currently Installed

4.   GPS Antenna Information

4.1  Antenna Type             : DORNE MARGOLIN T
     Serial Number            : 94368
     Antenna Height (m)       : 0.000
     Antenna Reference Point  : ARP
     Degree Offset from North : 0
     Antenna Radome Type      : acrylic (UNAVCO type)
     Date Installed           : 17-NOV-1998 23:00 UT
     Date Removed             :
     Additional Information   : ref. Antenna Diagram 'A' below
                              : Antenna p/n 7490582-2
                              : Currently Installed


5.   Local Site Ties
        NONE


6.   Frequency Standard

6.1  Standard Type            : clock steering
       Frequency              :
       Effective Dates        : 17-NOV-1998 23:00 UT
       Notes                  : Currently Installed


7.   Collocation Information  NONE


8.   Meteorological Instrumentation  NONE


9.   On-Site, Point of Contact Agency Information

     Agency                   : Geological Survey of Canada
     Mailing Address          : P.O. Box 6000
                              : 9860 West Saanich Rd.
                              : Sidney, B.C.
                              : Canada V8L 4B2
     Primary Contact
       Contact Name           : Michael Schmidt
       Telephone (primary)    : 250-363-6760
       Telephone (secondary)  : 250-363-6500
       Fax                    : 250-363-6565
       E-mail                 : schmidt@pgc.nrcan.gc.ca
     Secondary Contact
       Contact Name           : Herb Dragert
       Telephone (primary)    : 250-363-6447
       Telephone (secondary)  : 250-363-6500
       Fax                    : 250-363-6565
       E-mail                 : dragert@pgc.nrcan.gc.ca
     Additional Information   :


10.  Responsible Agency (see No. 9.)


11.  More Information

     URL for More Information : www.pgc.nrcan.gc.ca/geodyn.htm
     Hardcopy on File
       Site Map               : (Y)
       Site Diagram           : (Y)
       Horizon Mask           : (Y)
       Monument Description   : (Y)
       Site Pictures          : (Y)
     Additional Information   : Hardcopy Information available from www site
or
                              : site contact
     Antenna Graphics with Dimensions:


Antenna Diagram A
*****************

           TURBOROGUE: DORNE MARGOLIN T (Allen Osborne Design)
                                  (not to scale)

                              .  .  .
                         .                .
                     .                        .
                  .                              .
               .                                    .
             .                                        .
           .                                            .
         .                                                .
       .                                                    .<-- ACRYLIC
DOME
      .                                                      .
     .                                                        .
     .                                                        .
     .                                                        .
     .                                                        .
     .                                                        .
     .                         -----                          .
     .                                                        .
     .                     /     +     \                      . <-- 0.128 L2
     .                    |      +      |                     . <-- 0.110 L1
     .    +-----------------------------------------------+   . <-- 0.102
TCR
     .    |                                               |   .
     .    |                                               |   .
     .    |                                               |   .
     .    |                                               |   .
     . +-+------------------------------------------------+-+ .  <-- 0.038
     . +-------------------+-------------+------------------+ .  <-- 0.035
BCR
     .          | |        |             |        | |         .
STAINLESS STEEL | |        |             |        | |
 SECURITY BOLT  | |        +------X------+   <----|-|-------------  0.000
ARP
                | |        *             *        | |
              ============ *             * ============
                           *             *              STAINLESS STEEL
              ============ *             * ============  SECURITY RING
                           *             *
                           *             * STAINLESS
                           *             * STEEL
                           *             * PEDESTAL


                     X ...  Antenna Reference Point (ARP)
                            AND
                            Monument Reference Point

   L1 : L1 Phase Center                   L2 : L2 Phase Center
   TCR: Top of Chokering                  BCR: Bottom of Chokering