DX4641 ***********************************************************************
DX4641  DESIGNATION -  LA BREA J 7
DX4641  PID         -  DX4641
DX4641  STATE/COUNTY-  CA/ORANGE
DX4641  USGS QUAD   -  YORBA LINDA (1981)
DX4641
DX4641                         *CURRENT SURVEY CONTROL
DX4641  ___________________________________________________________________
DX4641* NAD 83(1992)-  33 56 35.13242(N)    117 49 21.36511(W)     ADJUSTED
DX4641* NAVD 88     -       441.     (meters)    1447.     (feet)  VERTCON
DX4641  ___________________________________________________________________
DX4641  EPOCH DATE  -        1991.35
DX4641  LAPLACE CORR-           5.75  (seconds)                    DEFLEC99
DX4641  GEOID HEIGHT-         -34.42  (meters)                     GEOID99
DX4641
DX4641  HORZ ORDER  -  SECOND
DX4641
DX4641.The horizontal coordinates were established by classical geodetic methods
DX4641.and adjusted by the National Geodetic Survey in June 1996.
DX4641.The horizontal coordinates are valid at the epoch date displayed above.
DX4641.The epoch date for horizontal control is a decimal equivalence
DX4641.of Year/Month/Day.
DX4641
DX4641.The NAVD 88 height was computed by applying the VERTCON shift value to
DX4641.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
DX4641
DX4641.The Laplace correction was computed from DEFLEC99 derived deflections.
DX4641
DX4641.The geoid height was determined by GEOID99.
DX4641
DX4641;                    North         East     Units   Scale      Converg.
DX4641;SPC CA 6     - 2,290,391.74  6,084,708.05   sFT  1.00001053 -0 51 51.0
DX4641;SPC CA 6     -   698,112.800 1,854,622.724   MT  1.00001053 -0 51 51.0
DX4641;UTM  11      - 3,756,150.909   423,982.931   MT  0.99967123 -0 27 33.6
DX4641
DX4641:                Primary Azimuth Mark                     Grid Az
DX4641:SPC CA 6     -  BREA UNION OIL TANK                      247 55 32.7
DX4641:UTM  11      -  BREA UNION OIL TANK                      247 31 15.3
DX4641
DX4641|---------------------------------------------------------------------|
DX4641| PID    Reference Object                     Distance      Geod. Az  |
DX4641|                                                           dddmmss.s |
DX4641|        LA BREA J 7 AZ MK                                  0171228.5 |
DX4641| DX4653 BREA COLLIER CHEM CORP ELEV         APPROX. 5.2 KM 2333012.0 |
DX4641| DX4644 BREA UNION OIL TANK                 APPROX. 3.9 KM 2470341.7 |
DX4641| DX4801 BREA MUNICIPAL TANK                 APPROX. 6.7 KM 2560852.7 |
DX4641| DX4642 OLINDA                                2.394 METERS 27415     |
DX4641|        LA BREA J 7 RM 1                      6.967 METERS 27923     |
DX4641|---------------------------------------------------------------------|
DX4641
DX4641                          SUPERSEDED SURVEY CONTROL
DX4641
DX4641  NAD 83(1986)-  33 56 35.13359(N)    117 49 21.36480(W) AD(1984.00) 2
DX4641  NAD 27      -  33 56 35.08290(N)    117 49 18.14780(W) AD(       ) 2
DX4641  NGVD 29     -       440.     (m)         1444.     (f) VERT ANG
DX4641
DX4641.Superseded values are not recommended for survey control.
DX4641.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
DX4641.See file dsdata.txt to determine how the superseded data were derived.
DX4641
DX4641  HISTORY     - Date     Condition        Recov. By
DX4641  HISTORY     - 1937     MONUMENTED       CA-037
DX4641  HISTORY     - 1958     GOOD             CGS
DX4641
DX4641                          STATION DESCRIPTION
DX4641
DX4641''DESCRIBED BY COAST AND GEODETIC SURVEY 1958
DX4641''THE STATION IS LOCATED AIRLINE ABOUT 5 MILES NORTHEAST OF BREA, 4
DX4641''MILES NORTH OF YORBA LINDA AND 2 MILES NORTH-NORTHEAST OF OLINDA.  IT
DX4641''IS IN THE CHINO HILLS, ON THE HIGHEST POINT OF THE HILLS LYING BETWEEN
DX4641''TONNER AND CARBON CANYONS AND NEAR THE NORTHWEST END OF THE HILLS
DX4641''LYING BETWEEN THE TWO CANYONS.  THE ELEVATION OF THE STATION HILL IS
DX4641''1450 FEET.
DX4641''
DX4641''TO REACH THE STATION FROM THE POST OFFICE IN YORBA LINDA GO SOUTH ON
DX4641''MAIN STREET 0.05 MILE TO THE INTERSECTION OF MAIN STREET AND IMPERIAL
DX4641''HIGHWAY.  TURN RIGHT AND GO WESTERLY ON IMPERIAL HIGHWAY, TOWARD BREA,
DX4641''FOR 2.6 MILES TO THE INTERSECTION OF VALENCIA AVENUE.  TURN RIGHT AND
DX4641''GO NORTHERLY ON VALENCIA AVENUE FOR 0.8 MILE TO THE FORK OF CARBON
DX4641''CANYON ROAD AND VALENCIA AVENUE.  TAKE THE LEFT FORK, VALENCIA AVENUE,
DX4641''AND CONTINUE NORTHERLY ON THE MAIN ROAD FOR 0.25 MILE TO A CROSSROAD.
DX4641''CONTINUE STRAIGHT AHEAD FOR 0.1 MILE TO THREE FORKS.  KEEP THE RIGHT
DX4641''FORK, MAIN ROAD, AND CONTINUE 0.2 MILE TO A CROSSROAD (AND REVERSE
DX4641''FORK ON THE RIGHT).  CONTINUE STRAIGHT AHEAD NORTHWESTERLY FOR 0.15
DX4641''MILE TO A CROSSROAD.  TURN RIGHT, NORTH, FOR 0.05 MILE TO A FORK.
DX4641''KEEP THE RIGHT FORK, STRAIGHT AHEAD, FOR 0.1 MILE TO A FORK. TAKE THE
DX4641''RIGHT FORK, EAST, FOR 0.05 MILE TO A LOCKED, STEEL GATE ON THE LEFT
DX4641''(IN RAMSHACKLE CONDITION).  TURN LEFT THROUGH THE LOCKED GATE (WHICH
DX4641''WAS PASSED THROUGH BY REMOVING FROM HINGES) AND GO NORTHEASTERLY ON
DX4641''THE TRACK ROAD LEADING UP THE RIDGE FOR 1.55 MILES TO A LOCKED,
DX4641''WOODEN GATE.  PASS THROUGH THE LOCKED GATE (WHICH WAS PASSED THROUGH
DX4641''BY REMOVING FROM HINGES) AND CONTINUE 0.35 MILE TO A FORK.  KEEP THE
DX4641''RIGHT FORK AND CONTINUE EASTERLY 0.2 MILE TO A FROK.  TAKE THE RIGHT
DX4641''FORK AND CONTINUE SOUTHERLY FOR 0.1 MILE TO A DIM CROSSRAOD.  BEAR
DX4641''LEFT, ONTO THE DIM ROAD, AND CONTINUE ABOUT 50 YARDS TO THE SUMMIT OF
DX4641''THE HILL AND THE STATION.
DX4641''
DX4641''TO REACH THE AZIMUTH MARK FROM THIS FORK, TAKE THE LEFT FORK AND GO
DX4641''NORTHERLY 0.1 MILE TO A LARGE TURNAROUND IN THE TRACK ROAD.  PACK
DX4641''NORTHEAST ABOUT 150 FEET AROUND THE SIDE OF THE HILL TO A LARGE
DX4641''BOULDER, SMALL CAIRN AND THE AZIMUTH MARK.
DX4641''
DX4641''THE STATION MARK IS A STANDARD LOS ANGELES COUNTY SURVEY CONTROL
DX4641''SYSTEM MARK STAMPED R.E. 2177 LA BREA. J.7. L.A. COUNTY SURVEYOR 1937
DX4641''SET IN THE TOP OF A 12-INCH SQUARE TOPPED CONCRETE MONUMENT, WHICH IS
DX4641''FLUSH WITH THE GROUND.
DX4641''
DX4641''REFERENCE MARK NUMBER 1 IS A STANDARD LOS ANGELES COUNTY SURVEY
DX4641''CONTROL SYSTEM MARK STAMPED R.E. 2177 LA BREA J. 7 R.M. NO. 1 L.A.
DX4641''COUNTY SURVEYOR 1937 SET IN THE TOP OF A 12-INCH SQUARE TOPPED
DX4641''CONCRETE MONUMENT, AND PROJECTS 4 INCHES.  IT IS ABOUT 1.5 FEET LOWER
DX4641''IN ELEVATION THAN THE STATION.
DX4641''
DX4641''REFERENCE MARK NUMBER 2 IS A 3-INCH DIAMETER TURNED BRASS CAP STAMPED
DX4641''SHELL CO. OF CALIF. TRI. STA. OLINDA ELEV. LRG 1927 SET IN AN
DX4641''IRREGULAR MASS OF CONCRETE, ABOUT 12 INCHES ACROSS, AND WHICH IS FLUSH
DX4641''WITH THE GROUND.  THE MARK PROJECTS ABOUT 1/2 INCH ABOVE THE CONCRETE
DX4641''AND IS ABOUT THE SAME ELEVATION AS THE STATION.
DX4641''
DX4641''AZIMUTH MARK IS A STANDARD DISK STAMPED LA BREA J 7 LAC 1958 CEMENTED
DX4641''IN A DRILL HOLE IN A LARGE OUTCROPPING BOULDER, AND PROJECTS 2 FEET.
DX4641''IT IS ABOUT 150 FEET NORTHEAST OF A TURNAROUND IN A DIRT ROAD AND 1
DX4641''FOOT SOUTH-SOUTHWEST OF A SMALL CAIRN.