**********************************
     SITE INFORMATION FORM
**********************************


0. Form

        Prepared by (full name): Ken Hudnut / Yehuda Bock / Jeff Behr /
                                    Shelley Marquez
        Date                   : October 4, 1994
        Report type            : NEW
          (NEW or UPDATE) 

1. Site Identification of the GPS monument

        Site Name              : Holcomb Ridge (SCIGN/PGGA)
        4 char ID              : HOLC
        Monument Inscription   : None
                                 3/4" diameter, vertical stainless steel rod
                                 with brass adaptor limestone foundation, 4
                                 10-12 foot stainless steel rods - one
                                  vertical, three oblique, welded above surface
        IERS DOMES Number      : 40404M101
        CDP Number             : Not assigned
        Date                   : August 12, 1994
        Additional information : SCIGN - Southern California Integrated GPS
                                    Network
                                 PGGA - Permanent GPS Geodetic Array

2. Site Location
        City                   : SE of Pearblossom
        Country                : Los Angeles County, California USA
        Tectonic Plate         : Pacific-North America plate boundary
        Additional information : ITRF92 coordinates (m) --
                                 X -2459517.863
                                 Y -4655992.343 
                                 Z  3589168.783
                                 Epoch 1994.75

3. GPS Receiver

     a) Type                   : Ashtech ZX-II3 (Z12) Model 700570-6B
        Serial Number          : 03377 (Loaner # 1)
        Firmware Version       : NAV 1D00, CHN 1C01
        Date                   : August 12, 1994
        Note                   : First measurements

4. GPS Antenna

     a) Type                   : Ashtech L1/L2 P Model 700718-B (Large Ground
                                    Plane)
        Serial Number          : 10293
        Cable                  : 42 m (extra long)
        Vertical Antenna Height: 0.0876 m
        Antenna Reference Point: BPA (Bottom of Preamplifier)
        Date                   : August 12, 1994

5. Local Site Ties -- In progress
        
6. Frequency standard

        H-maser /   /   Cesium /   /    Quartz /   /     Internal / X /
        Other (specify)        :
        Date                   : August 12, 1994

7. Collocation -- None

8. On-site, Point of Contact Agency Information 

        Agency                 : U.S. Geological Survey
                                 Office of Earthquakes, Volcanoes and
                                    Engineering
        Contact                : Kenneth W. Hudnut
        Address                : U.S. Geological Survey
                                 525 South Wilson Ave.
                                 Pasadena, CA 91106
        Telephone              : (818) 583-7232
        E-mail                 : hudnut@seismo.gps.caltech.edu
        Fax                    : (818) 583-7827

9. Responsible Operations Agency 
   (if different from item 8)

        Agency                 : Scripps Institution of Oceanography
        Contact                : Yehuda Bock / Jeff Behr
        Address                : IGPP 0225, Scripps Institution of Oceanography
                                 9500 Gilman Drive, La Jolla, CA 92093-0225
        Telephone              : (619) 534-7692 (0229/5292)
        E-mail                 : bock@pgga.ucsd.edu, behr@pgga.ucsd.edu
        Fax                    : (619) 534-9873

10. Please insert here the character graphics corresponding to the 
antenna type. Check, complete or change if necessary the antenna 
dimensions.


               Ashtech: GEODETIC L1/L2 P Large Ground Plane

                           ^
                 +-------------------+
+-+--+-+-------+-----------+-----------+--------+-+--+-+    <--  0.064 TGP=L1=L2
+-+--+-+------------+-------------+-------------+-+--+-+    <--  0.??? BGP
                    |-------------|
                    |-------------|
                    |-------------|
                    |-------------|
                    +------x------+                       <--  0.000 ARP=BPA

                  <--    0.080    -->
<--                      0.3474                      -->


   ARP: Antenna Reference Point
   L1 : L1 Phase Center                   L2 : L2 Phase Center
   TGP: Top of Ground Plane               BGP: Bottom of Ground Plane
   TPA: Top of Preamplifier               BPA: Bottom of Preamplifier

11. Hard copy information

    The next items should be compiled and sent to the Central Bureau
(see original IGS Station Information Report, or contact the CB for
forms).

    Please mark 'X' if on file or date expected to be available.

        Site Map               :
        Site Diagram           :
        Horizon Mask           :
        Monument description   :
        Site pictures          :