STATE OF VIRGINIA
1                                                              CONTENTS



           BASE LINE DESIGNATION                      STATE                    COUNTY                    QUAD


           CORBIN CBL (1991 REMEASURED)               VIRGINIA                 CAROLINE                  N380772
           EPG BASE                                   VIRGINIA                 FAIRFAX                   N380772
           NORFOLK CBL (1993 VERIFIED)                VIRGINIA                 CITY OF NORFOLK           N360761
           VIRGINIA TECH                              VIRGINIA                 MONTGOMERY                N370802
 
1US DEPARTMENT OF COMMERCE - NOAA                  CALIBRATION BASE LINE DATA                        QUAD: N380772
 NOS - NATIONAL GEODETIC SURVEY                    BASE LINE DESIGNATION:  CORBIN CBL                VIRGINIA
 ROCKVILLE MD 20852                                PROJECT ACCESSION NUMBER:  15767                  CAROLINE COUNTY
                                                   NEAREST TOWN:  CORBIN

                                              LIST OF ADJUSTED DISTANCES  (JANUARY 16, 1992)

                                                                                      ADJ. DIST.(M)   ADJ. DIST.(M)      STD.
    FROM STATION                    ELEV.(M)  TO STATION                      ELEV.(M)   HORIZONTAL     MARK - MARK   ERROR(MM)

    CORBIN WEST BASE                  66.720 50 M                              66.909       50.0052        50.0056       0.0
    CORBIN WEST BASE                  66.720 300 M                             65.516      300.0004       300.0029       0.1
    CORBIN WEST BASE                  66.720 500 M                             64.054      499.9940       500.0011       0.1
    CORBIN WEST BASE                  66.720 1000 M                            64.943     1000.0203      1000.0219       0.1

    50 M                              66.909 300 M                             65.516      249.9952       249.9991       0.1
    50 M                              66.909 500 M                             64.054      449.9888       449.9979       0.1
    50 M                              66.909 1000 M                            64.943      950.0151       950.0172       0.1

    300 M                             65.516 500 M                             64.054      199.9936       199.9989       0.1
    300 M                             65.516 1000 M                            64.943      700.0198       700.0201       0.1

    500 M                             64.054 1000 M                            64.943      500.0262       500.0270       0.1

 DESCRIPTION OF CORBIN BASE LINE
 YEAR MEASURED:  1976 - 1982
 YEAR REMEASURED: 1991
 CHIEF OF PARTY:  VARIOUS

 THE BASE LINE IS LOCATED APPROXIMATELY 10 MILES NORTH OF BOWLING GREEN, NINE MILES SOUTH-SOUTHEAST OF FREDERICKSBURG AND 0.6 MILE
 EAST OF CORBIN, VIRGINIA.  THE BASE LINE IS SITUATED ON U.S. GOVERNMENT PROPERTY AT THE SITE OF THE FREDERICKSBURG GEOMAGNETIC
 CENTER AND THE OFFICE OF THE INSTRUMENT AND EQUIPMENT BRANCH OF THE NATIONAL GEODETIC SURVEY.

 TO REACH THE INSTRUMENT AND EQUIPMENT BRANCH OFFICE OF THE NATIONAL GEODETIC SURVEY FROM THE JUNCTION OF U.S. HIGHWAY 17 SOUTH
 BYPASS AND VIRGINIA STATE HIGHWAY 2 WHICH IS APPROXIMATELY 6.5 MILES SOUTH OF FREDERICKSBURG, GO SOUTH ON STATE HIGHWAY 2 FOR 2.35
 MILES TO A STORE ON THE LEFT AND A SIDE ROAD LEFT, JUST BEYOND THE STORE IN THE SMALL SETTLEMENT OF CORBIN.  TURN LEFT AND GO
 SOUTHEAST AND EAST ON STATE HIGHWAY 610 FOR 0.4 MILE TO WHERE THE HIGHWAY BEARS SHARP LEFT AND A SECONDARY ROAD (BURMA ROAD) GOES
 STRAIGHT AHEAD.  CONTINUE EAST ON BURMA ROAD (U.S. PROPERTY) FOR 0.3 MILE TO A CIRCLE DRIVEWAY ON THE LEFT.  TURN LEFT AND GO NORTH
 AND EAST ON THE DRIVEWAY FOR 0.1 MILE TO THE OFFICE OF THE INSTRUMENT AND EQUIPMENT BRANCH ON THE LEFT WHERE INFORMATION CONCERNING
 THE LOCATION OF THE BASE LINE CAN BE OBTAINED.

 THE HORIZONTAL LENGTH OF THE BASE LINE IS 1000 METERS.  IT IS MONUMENTED AT 0M, 50M, 300M, 500M, 925M, AND 1000M.  EACH MONUMENT IS
 OF POURED CONCRETE SET INTO A DEPTH OF FIVE FEET.  THE MONUMENTS PROTRUDE TWO INCHES ABOVE THE GROUND SURFACE AND TAPER FROM 18
 INCHES IN DIAMETER AT THE BOTTOM TO 10 INCHES SQUARE AT THE TOP.  THERE IS A BRONZE DISK SET IN THE TOP OF EACH CONCRETE MONUMENT
 AND THE EXACT POINT IS A 0.4 MILLIMETER DIAMETER DRILLED HOLE IN THE CENTER OF THE DISKS.

 EACH MONUMENT HAS OVER IT A PERMANENT FOUR LEGGED ANODIZED ALUMINUM INSTRUMENT STAND.  THE STANDS ARE FITTED WITH 12 INCH CIRCULAR
 TRIBRACHS WITH A 3/4 INCH DIAMETER HOLE IN THEIR CENTER.  THE TRIBRACHS ARE ADJUSTABLE FOR COLLIMATING PURPOSES. EACH POINT ON THE
 BASE LINE IS VISIBLE FROM ANY OTHER POINT ON THE BASE.  EACH POINT CAN BE DRIVEN TO IN ANY TWO-WHEEL DRIVE VEHICLE IN ANY WEATHER.

 CORBIN BASE LINE WAS ESTABLISHED PRIMARILY FOR USE BY THE NATIONAL GEODETIC SURVEY FOR THE CALIBRATION AND TESTING OF ELECTRONIC
 DISTANCE MEASURING INSTRUMENTS.  ARRANGEMENTS FOR USE OF THE BASE LINE CAN BE MADE BY CONTACTING:  WILLIAM V. MAST OR CHARLES C.
 GLOVER, INSTRUMENT AND EQUIPMENT BRANCH, NATIONAL GEODETIC SURVEY, NATIONAL OCEAN SURVEY, NOAA, P.O. BOX 1, CORBIN, VIRGINIA 22446.
 PHONE:  COMMERCIAL NO. (703) 373-7605 OR FTS NO. (925) 0243-0244.

1 US DEPARTMENT OF COMMERCE - NOAA                  CALIBRATION BASE LINE DATA                        QUAD:  N380772
  NOS - NATIONAL GEODETIC SURVEY                    BASE LINE DESIGNATION:  EPG BASE                  VIRGINIA
  ROCKVILLE MD 20852 - APRIL 29, 1987               PROJECT ACCESSION NUMBER:  G15767                 FAIRFAX COUNTY
                                                    NEAREST TOWN:  NEWINGTON

                                               LIST OF ADJUSTED DISTANCES  (MARCH 18, 1987)

                                                                                      ADJ. DIST.(M)   ADJ. DIST.(M)    STD.
    FROM STATION                    ELEV.(M)  TO STATION                      ELEV.(M)  HORIZONTAL     MARK - MARK   ERROR(MM)

    0                                 91.440 101                               91.531      101.2057       101.2057       0.3
    0                                 91.440 201                               91.288      201.4486       201.4487       0.3
    0                                 91.440 351                               91.036      351.4116       351.4119       0.3
    0                                 91.440 501                               91.259      501.3367       501.3368       0.3
    0                                 91.440 651                               91.225      651.3590       651.3591       0.3
    0                                 91.440 751                               91.098      751.5546       751.5546       0.4
    0                                 91.440 851                               90.917      851.3155       851.3156       0.4
    0                                 91.440 911                               90.942      911.3083       911.3084       0.4

    101                               91.531 201                               91.288      100.2429       100.2432       0.3
    101                               91.531 351                               91.036      250.2060       250.2065       0.3
    101                               91.531 501                               91.259      400.1311       400.1312       0.3
    101                               91.531 651                               91.225      550.1534       550.1535       0.3
    101                               91.531 751                               91.098      650.3489       650.3491       0.3
    101                               91.531 851                               90.917      750.1098       750.1101       0.3
    101                               91.531 911                               90.942      810.1026       810.1028       0.4

    201                               91.288 351                               91.036      149.9630       149.9632       0.3
    201                               91.288 501                               91.259      299.8881       299.8881       0.2
    201                               91.288 651                               91.225      449.9104       449.9104       0.2
    201                               91.288 751                               91.098      550.1060       550.1060       0.3
    201                               91.288 851                               90.917      649.8669       649.8670       0.3
    201                               91.288 911                               90.942      709.8597       709.8598       0.3

    351                               91.036 501                               91.259      149.9251       149.9253       0.2
    351                               91.036 651                               91.225      299.9474       299.9474       0.2
    351                               91.036 751                               91.098      400.1429       400.1429       0.3
    351                               91.036 851                               90.917      499.9038       499.9038       0.3
    351                               91.036 911                               90.942      559.8966       559.8966       0.3

    501                               91.259 651                               91.225      150.0223       150.0223       0.1
    501                               91.259 751                               91.098      250.2178       250.2179       0.2
    501                               91.259 851                               90.917      349.9787       349.9789       0.2
    501                               91.259 911                               90.942      409.9716       409.9717       0.3

    651                               91.225 751                               91.098      100.1955       100.1956       0.2
    651                               91.225 851                               90.917      199.9564       199.9567       0.2
    651                               91.225 911                               90.942      259.9493       259.9494       0.3

    751                               91.098 851                               90.917       99.7609        99.7611       0.3
    751                               91.098 911                               90.942      159.7537       159.7538       0.3

    851                               90.917 911                               90.942       59.9928        59.9928       0.3
 

 DESCRIPTION OF EPG BASE BASE LINE
 YEAR MEASURED:  1987
 CHIEF OF PARTY:  CCG

1THE BASE LINE IS LOCATED ABOUT 3.7 KM (2.3 MILES) SOUTHWEST OF FRANCONIA, 3.2 KM (2 MILES) SOUTHEAST OF WEST SPRINGFIELD, 1.6 KM (1
 MILE) NORTH-NORTHWEST OF NEWINGTON AND 0.5 KM (0.3 MILE) WEST OF U.S. INTERSTATE HIGHWAY 95.  IT IS ON THE GROUNDS OF THE FORT
 BELVOIR ENGINEER PROVING GROUNDS.

 TO REACH THE BASE LINE FROM THE MAIN GATE OF THE PROVING GROUNDS AT 7500 BACK LICK ROAD (VIRGINIA STATE ROAD 617), GO WEST ON
 MACADAM ROAD FOR 0.2 KM (0.1 MILE) TO A SIDE ROAD RIGHT, GO RIGHT AND NORTH ON MACADAM ROAD FOR 0.2 KM (0.1 MILE) TO A DIRT ROAD
 LEFT.  GO LEFT AND NORTH-NORTHWEST ON DIRT ROAD FOR 0.2 KM (0.1 MILE) TO EAST END OF BASE LINE AND THE 0 METER POINT.

 THE BASE LINE IS AN EAST-WEST LINE WITH 9 MONUMENTED POINTS LOCATED AT 0, 101, 201, 351, 501, 651, 751, 851, AND 911 METERS.  ALL
 MARKS ARE STANDARD U.S. ARMY CORPS OF ENGINEERS SURVEY DISKS SET IN THE TOP OF POURED CONCRETE MONUMENTS WHICH ARE 18 CM (7 INCHES)
 SQUARE AND ABOUT 2.5 CM (1 INCH) BELOW GROUND LEVEL.  THE DISKS ARE STAMPED BEGINNING WITH THE 0 METER MONUMENT B-1, B-2, B-3, B-4,
 B-5, B-6, B-7, B-8, B-9.

 FOR INFORMATION CONCERNING ACCESS TO AND USE OF THE BASE LINE, CONTACT MR. MARK H. THOMAS, FORT BELVOIR RD&E CENTER, STRBEJCT, FORT
 BELVOIR, VIRGINIA.  TELEPHONE:  AUTOVON 354-6784, COMMERCIAL (703) 664-6784.

1US DEPARTMENT OF COMMERCE - NOAA                  CALIBRATION BASE LINE DATA                        QUAD:  N360761
 NOS - NATIONAL GEODETIC SURVEY                    BASE LINE DESIGNATION:  NORFOLK CBL               VIRGINIA
 ROCKVILLE MD 20852 - MAY 3, 1993                  PROJECT ACCESSION NUMBER:  G15767                 CITY OF NORFOLK
                                                   NEAREST TOWN:  NORFOLK

                                              LIST OF ADJUSTED DISTANCES (SEPTEMBER 22, 1980)

                                                                                       ADJ. DIST.(M)  ADJ. DIST.(M)    STD.
      FROM STATION                  ELEV.(M)   TO STATION                     ELEV.(M)   HORIZONTAL     MARK - MARK   ERROR(MM)

          0                         4.37         150                          4.40         150.0323       150.0323       0.2
          0                         4.37         798                          4.23         797.7728       797.7728       0.4
          0                         4.37         1440                         3.89        1440.0915      1440.0915       0.5

          150                       4.40         798                          4.23         647.7405       647.7405       0.3
          150                       4.40         1440                         3.89        1290.0591      1290.0592       0.5

          798                       4.23         1440                         3.89         642.3187       642.3188       0.3


 DESCRIPTION OF NORFOLK BASE LINE
 YEAR MEASURED:  1980
 YEAR VERIFIED: 1993
 CHIEF OF PARTY: KM

 A TAPE CALIBRATION MONUMENT IS SET 100 FEET FROM THE 0-METER POINT. THE REDUCED MARK-TO-MARK DISTANCE IS 30.483 M (100.01 FT).

 THE BASE LINE IS LOCATED ON THE NORTHEAST SIDE OF NORFOLK.  THE BASE LINE RUNS ALONG AND IS APPROXIMATELY PARALLEL WITH THE MEDIAN
 STRIP THAT SEPARATES THE NORTH AND SOUTHBOUND LANES OF CHESAPEAKE BOULEVARD.

 THE BASE LINE IS A NORTH-SOUTH LINE WITH THE 0-METER POINT ON THE SOUTH END. IT CONSISTS OF THE 0, 150, 798, AND 1440 METER POINTS
 WITH A 100-FOOT TAPE CALIBRATION STATION LOCATED ON LINE AND NORTH OF THE 0-METER POINT.

 TO REACH THE 0-METER POINT FROM THE JUNCTION OF INTERSTATE HIGHWAY 64 (EXIT 278) AND STATE ROAD 194 (CHESAPEAKE BOULEVARD), LOCATED
 IN NORTHERN NORFOLK, GO NORTH ON CHESAPEAKE BOULEVARD FOR 1.3 KM (0.8 MI) TO THE INTERSECTION OF LITTLE CREEK ROAD.  CONTINUE NORTH
 ON CHESAPEAKE BOULEVARD FOR 0.18 KM (0.11 MI) TO THE 0-METER POINT ON THE LEFT IN THE GRASS MEDIAN STRIP.

 THE 0-METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISK STAMPED "0 M" SET IN THE TOP OF A 30 CM (12 IN) DIAMETER CONCRETE
 POST RECESSED 30 CM (12 IN) BELOW THE SURFACE OF THE GROUND SURROUNDED BY A MANHOLE AND COVERED BY A MANHOLE LID INSCRIBED, CITY
 WATER METER, THAT IS FLUSH WITH THE SURFACE OF THE GROUND. IT IS 175 M (574 FT) NORTH OF THE CENTERLINE OF LITTLE CREEK ROAD, 11.1 M
 (36.4 FT) EAST OF THE CENTERLINE OF THE SOUTHBOUND LANES OF CHESAPEAKE BOULEVARD, 9.1 M (29.9 FT) WEST OF THE CENTERLINE OF THE
 NORTHBOUND LANES OF CHESAPEAKE BOULEVARD, AND 0.4 M (1.3 FT) EAST OF A METAL WITNESS POST.

 THE 150-METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISK STAMPED "150 M" SET IN THE TOP OF A 28 CM (11 IN) DIAMETER CONCRETE
 POST FLUSH WITH THE SURFACE OF THE GROUND.  IT IS 24.4 M (80.1 FT) NORTH-NORTHEAST OF WOODEN UTILITY POLE NO. EP73, 18.7 M (61.4 FT)
 SOUTH OF THE CENTERLINE OF A MEDIAN CROSSOVER, 11.5 M (37.7 FT) EAST OF THE CENTERLINE OF THE SOUTHBOUND LANES OF CHESAPEAKE
 BOULEVARD, 8.7 M (28.5 FT) WEST OF THE CENTERLINE OF THE NORTHBOUND LANES OF CHESAPEAKE BOULEVARD, 0.4 M (1.3 FT) EAST OF A METAL
 WITNESS POST, AND 0.4 M (1.3 FT) WEST OF A METAL WITNESS POST.

 THE 798-METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISK STAMPED "798 M" SET IN THE TOP OF A 28 CM (11 IN) DIAMETER CONCRETE
 POST FLUSH WITH THE SURFACE OF THE GROUND.  IT IS 42.7 M (140.1 FT) SOUTH OF THE CENTERLINE OF SHEPPARD AVENUE, 12.6 M (41.3 FT)
 EAST OF THE CENTERLINE OF THE SOUTHBOUND LANES OF CHESAPEAKE BOULEVARD, 7.7 M (25.3 FT) WEST OF THE CENTERLINE OF THE NORTHBOUND
 LANES OF CHESAPEAKE BOULEVARD, 6.7 M (22.0 FT) EAST OF WOODEN UTILITY POLE NO. EE08, AND 0.3 M (1.0 FT) WEST OF A METAL WITNESS
 POST.

1THE 1440-METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISK STAMPED "1440 M" SET IN THE TOP OF A 28 CM (11 IN) DIAMETER
 CONCRETE POST FLUSH WITH THE SURFACE OF THE GROUND.  IT IS 52.4 M (171.9 FT) SOUTH OF THE CENTERLINE OF FISHERMANS ROAD, 14.2 M
 (46.6 FT) EAST OF THE CENTERLINE OF THE SOUTHBOUND LANES OF CHESAPEAKE BOULEVARD, 10.7 M (35.1 FT) NORTHEAST OF WOODEN UTILITY POLE
 NO. DJ41, 7.9 M (25.9 FT) WEST OF THE CENTERLINE OF THE NORTHBOUND LANES OF CHESAPEAKE BOULEVARD, AND 0.4 M (1.3 FT) NORTH OF A
 METAL WITNESS POST.

 THE 100-FOOT TAPE CALIBRATION STATION IS A STANDARD NGS CALIBRATION BASE LINE DISK STAMPED "100 FT" SET IN THE TOP OF A 28 CM (11
 IN) DIAMETER CONCRETE POST FLUSH WITH THE SURFACE OF THE GROUND.  IT IS 205.5 M (674.2 FT) NORTH OF THE CENTERLINE OF LITTLE CREEK
 ROAD, 11.1 M (36.4 FT) EAST OF THE CENTERLINE OF THE SOUTHBOUND LANES OF CHESAPEAKE BOULEVARD, 9.0 M (29.5 FT) WEST OF THE
 CENTERLINE OF THE NORTHBOUND LANES OF CHESAPEAKE BOULEVARD, 5.5 M (18.0 FT) EAST OF WOODEN UTILITY POLE NO. 61, AND 0.3 M (1.0 FT)
 EAST OF A METAL WITNESS POST.

 USER NOTES: CBL USERS SHOULD TAKE CARE IN PLUMBING OVER ALL POINTS.  ELEVATIONS ARE FOR CBL USE ONLY.  TRAFFIC IS HEAVY ON
 CHESAPEAKE BOULEVARD, SAFETY PRECAUTIONS ARE RECOMMENDED.

 THE BASE LINE WAS ESTABLISHED AND REMEASURED WITH ASSISTANCE FROM THE CITY OF NORFOLK, DEPARTMENT OF PUBLIC WORKS, DIVISION OF
 SURVEYS.  FOR MORE INFORMATION PLEASE CONTACT MR. JOHN SAUNDERS, CITY SURVEYOR, DIVISION OF SURVEYS, 7TH FLOOR CITY HALL BUILDING,
 NORFOLK, VIRGINIA 23501.  TELEPHONE 804-441-2130.

1 US DEPARTMENT OF COMMERCE - NOAA                  CALIBRATION BASE LINE DATA                        QUAD:  N370802
  NOS - NATIONAL GEODETIC SURVEY                    BASE LINE DESIGNATION:  VIRGINIA TECH CBL         VIRGINIA
  ROCKVILLE MD 20852 - OCTOBER 29, 1986             PROJECT ACCESSION NUMBER:  G15767                 MONTGOMERY COUNTY

                                               LIST OF ADJUSTED DISTANCES (APRIL 12, 1982)

                                                                                      ADJ. DIST.(M)   ADJ. DIST.(M)    STD.
    FROM STATION                    ELEV.(M) TO STATION                      ELEV.(M)  HORIZONTAL     MARK - MARK   ERROR(MM)

        0                           649.385    150                           647.452       150.0009       150.0133        .3
        0                           649.385    430                           643.902       429.9545       429.9894        .6
        0                           649.385    1000                          639.379       999.9378       999.9879        .7
        0                           649.385    1400                          641.796      1399.9679      1399.9885        .9

        150                         647.452    430                           643.902       279.9536       279.9761        .5
        150                         647.452    1000                          639.379       849.9370       849.9753        .6
        150                         647.452    1400                          641.796      1249.9670      1249.9798        .8

        430                         643.902    1000                          639.379       569.9833       570.0012        .6
        430                         643.902    1400                          641.796       970.0131       970.0154        .5

        1000                        639.379    1400                          641.796       400.0296       400.0369        .6

      DESCRIPTION OF VIRGINIA TECH BASE LINE
      YEAR MEASURED:  1981
      CHIEF OF PARTY:  WJR

       * * * VIRGINIA TECH BASE LINE WAS REPORTED DESTROYED * * *

      A NEW CBL WAS SET BUT WAS NOT MEASURED BECAUSE IT FAILED TO MEET NGS SPECIFICATIONS.  A NEW STATION 950 SET.

      THE BASE LINE IS LOCATED ABOUT 10.6 KM (6.6 MI) NORTH OF CHRISTIANSBURG AND ON THE SOUTH SIDE OF BLACKSBURG AT THE
      VIRGINIA TECH AIRPORT ALONG THE SOUTH WEST SIDE OF THE NORTHWEST-SOUTHEAST RUNWAY.

      TO REACH THE 0 METER POINT FROM THE VIRGINIA TECH AIRPORT CONTROL OFFICE, BEAR RIGHT AND FOLLOW TAXIWAY FOR 0.16 KM (0.1
      MI) TO MAIN RUNWAY, TURN RIGHT AND FOLLOW RIGHT SIDE OF RUNWAY FOR 0.32 KM (0.2 MI) TO THE 430 METER POINT 150 FEET
      SOUTHWEST OF EDGE OF RUNWAY, CONTINUE ALONG RUNWAY FOR 0.24 KM (0.15 MI) TO THE 150 METER POINT 150 FEET SOUTHWEST OF EDGE
      OF RUNWAY, CONTINUE ALONG RUNWAY FOR 0.16 KM (0.1 MI) TO THE END OF RUNWAY AND THE 0 METER POINT 150 FEET SOUTHWEST OF
      EDGE OF RUNWAY.  TO REACH THE 1000 AND 1400 METER POINTS START MILEAGE BACK WHERE TAXIWAY MEETS MAIN RUNWAY, GO NORTHWEST
      ON LEFT SIDE OF MAIN RUNWAY FOR 0.32 KM (0.2 MI) TO THE 1000 METER POINT 150 FEET SOUTHWEST OF EDGE OF RUNWAY, CONTINUE TO
      END OF RUNWAY, BEAR LEFT AND CONTINUE WESTERLY ACROSS RAILROAD GRADE FOR 1.3 KM (0.8 MI) TO THE 1400 METER POINT.

      THE 0 METER POINT IS A STANDARD NGS DISK SET INTO THE TOP OF A ROUND CONCRETE MONUMENT 50.8 CM (20 IN) IN DIAMETER FLUSH
      WITH THE GROUND LOCATED 46.88 M (153.8 FT) SW FROM THE SOUTH MOST CORNER OF THE SOUTHEAST END OF RUNWAY, AND 45.72 M
      (150.0 FT) SW FROM THE SOUTHWEST EDGE OF RUNWAY.  THE 1400 METER POINT IS A STANDARD NGS DISK SET INTO THE TOP OF A ROUND
      CONCRETE MONUMENT 50.8 CM (20 IN) IN DIAMETER RECESSED 5 CM (2 IN) BELOW THE GROUND LOCATED 62.79 M (206.0 FT) SE FROM A 4
      FT HIGH CONCRETE ASTRO PILLAR, 62.18 M (204.0 FT) SW FROM THE SOUTHWEST CORNER OF THE SOUTHEAST SET OF RUNWAY LANDING
      LIGHTS, AND 39.38 M (129.2 FT) NW FROM AN ABANDON RAILROAD GRADE.  THE BASE LINE MARKS HAVE NOT BEEN STAMPED AT THIS TIME.
      THE 150, 430, 1000, AND 1400 METER POINTS HAVE CENTER PUNCH HOLES, NOT CROSSES.

      THE BASE LINE IS A NORTHWEST-SOUTHEAST LINE WITH THE 0 METER POINT ON THE SOUTHEAST END.  IT IS MADE UP OF THE 0, 150,
      430, 1000, AND 1400 METER POINTS.

      FOR SITE ACCESS CONTACT MR. BILL BYRNE, AIRPORT MANAGER, POST OFFICE BOX 903, BLACKSBURG, VA.  24060 TELEPHONE 703-961-6281.

      THIS BASE LINE WAS ESTABLISHED IN CONJUNCTION WITH THE CIVIL ENGINEERING DEPARTMENT AT VIRGINIA TECH.  FOR FURTHER
      INFORMATION CONTACT, CIVIL ENGINEERING DEPARTMENT, VIRGINIA POLYTECHNIC INSTITUTE AND STATE UNIVERSITY, BLACKSBURG,
      VIRGINIA 24061.  TELEPHONE (703) 961-7147.