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Details for Benchmark: HS3513

N 37° 40.691 W 121° 47.415 (NAD 83)

Altitude: 462.4

Coordinates may not be exact. Altitude is VERTCON and location is ADJUSTED. (more info)

Location:
In ALAMEDA county, CA View Original Datasheet
Designation:
LIVERMORE EAST BASE
Marker Type:
triangulation station disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

Reference Points

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I found an unusual depression in the right place, but I didn't find the mark. I found RM 4 only. I looked for RM's 1, 2, and 3, but did not find them. I did not look for the 1976 AZ, but I did look for the RESET 1964 AZ and saw why the 1976 report concluded it was under a sidewalk, if it's still there. I'll file logs under all the other marks' individual PIDs.

Documented History (by the NGS)

01/01/1947 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1947 (SPH) THE STATION IS LOCATED ABOUT 1 MILE WEST OF LIVERMORE ON RAILROAD RIGHT OF PROPERTY BETWEEN THE SOUTHERN PACIFIC AND THE WESTERN PACIFIC TRACKS, 83 FEET SOUTH OF THE SOUTH RAIL OF THE WESTERN PACIFIC TRACKS, 53.5 FEET NORTH OF THE NORTH RAIL OF THE SOUTHERN PACIFIC TRACKS, 33.5 FEET EAST OF A TELEPHONE POLE, AND 3.5 FEET NORTH OF A WITNESS POST. THE DISK IS A STANDARD STATION DISK STAMPED LIVERMORE EAST BASE 1947 AND THE MARK PROJECTS 4 INCHES. REFERENCE MARK NO. 1 IS 88.760 FEET EAST OF THE STATION, 92.5 FEET SOUTH OF THE SOUTH RAIL OF THE WESTERN PACIFIC TRACKS, 54 FEET NORTH OF THE NORTH RAIL OF THE SOUTHERN PACIFIC TRACKS, AND 16.5 FEET NORTHWEST OF A TELEGRAPH POLE. THE DISK IS A STANDARD REFERENCE DISK AND IS STAMPED LIVERMORE NO 1 1947. THE MARK PROJECTS 2 INCHES. REFERENCE MARK NO. 2 IS 85.259 FEET WEST OF THE STATION, 72.5 FEET SOUTH OF THE SOUTH RAIL OF THE WESTERN PACIFIC TRACKS, 54 FEET NORTH OF THE NORTH RAIL OF THE SOUTHERN PACIFIC TRACKS, AND 20 FEET NORTHWEST OF A RAILROAD PROPERTY MARKER. THE DISK IS A STANDARD REFERENCE DISK STAMPED LIVERMORE NO 2 1947 AND IS SET IN A MARK THAT PROJECTS 1 INCH. THE AZIMUTH MARK IS 0.3 MILE WEST OF THE STATION, 1 FOOT NORTH OF A FENCELINE, AND 30 FEET SOUTH OF THE CENTERLINE OF PLEASATON ROAD. THE DISK IS A STANDARD AZIMUTH DISK STAMPED LIVERMORE 1947 AND THE MARK PROJECTS 3 INCHES. TO REACH THE STATION FROM THE TALL FLAG POLE IN LIVERMORE, GO WEST ON PLEASATON ROAD (FIRST STREET) FOR 0.65 MILE TO A FORK, TAKE RIGHT FORK AND GO WEST ON PLEASATON ROAD FOR 0.75 MILE TO A DIRT SIDE ROAD RIGHT, THE AZIMUTH IS REACHED FROM HERE BY CONTINUING WEST ON PLEASATON ROAD FOR 0.3 MILE TO THE MARK ON THE LEFT, GO RIGHT ACROSS FIRST TRACKS THENCE TURN RIGHT AND GO EAST BETWEEN TRACKS FOR 0.1 MILE TO THE STATION. HEIGHT OF LIGHT ABOVE STATION MARK 30 METERS.
01/01/1958 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1958 (CS) THE STATION, REFERENCE MARK NO. 1, REFERENCE MARK NO. 2, AND THE AZIMUTH MARK WERE RECOVERED IN GOOD CONDITION AND AS DESCRIBED
01/01/1958 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1958 1.1 MI W FROM LIVERMORE. 1.1 MILES WEST ALONG THE SOUTHERN PACIFIC COMPANY RAILROAD FROM THE STATION AT LIVERMORE, IN R2E T3S S18, 9 RAILS EAST OF THE CROSSING OF A PRIVATE ASPHALT ROAD, 6 RAILS WEST OF THE WEST END OF WOODEN BRIDGE 45.90 OVER ARROYO MOCHO, BETWEEN THE SOUTHERN PACIFIC COMPANY RAILROAD AND THE WESTERN PACIFIC RAILROAD COMPANY TRACKS, AT A DIRT CUT BANK, 55 FEET NORTH OF THE NORTH RAIL OF THE SOUTHERN PACIFIC COMPANY RAILROAD TRACK, 30 FEET NORTHEAST OF THE THIRD POLE EAST OF THE CROSSING, 4 FEET NORTH OF A WITNESS POST, ABOUT 4 FEET HIGHER THAN THE TRACK, AND SET IN THE TOP OF A CONCRETE POST PROJECTING 0.2 FOOT ABOVE THE GROUND.
01/01/1962 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1962 (MSF) STATION DISK RECOVERED IN GOOD CONDITION. REFERENCE MARKS 1 AND 2 AND AZIMUTH MARK NOT SEARCHED FOR.
01/01/1963 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1963 (IRR) THE STATION MARK, AZIMUTH MARK, AND REFERENCE MARKS WERE RECOVERED IN GOOD CONDITION AND THE 1947 DESCRIPTION IS ADEQUATE.
01/01/1964 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1964 (EHS) THE STATION MARK, AZIMUTH MARK, AND REFERENCE MARKS NUMBER 1 AND 2 WERE RECOVERED IN GOOD CONDITION. THE AZIMUTH MARK WAS IN THE WAY OF ROAD CONSTRUCTION SO IT WAS RESET ABOUT 200 FEET TO THE WEST AND THE 1947 AZIMUTH MARK DISK WAS THEN REMOVED. THE 1947 DESCRIPTION IS ADEQUATE WITH THE FOLLOWING ADDITIONS-- THE RESET AZIMUTH MARK IS A COAST AND GEODETIC SURVEY AZIMUTH MARK DISK STAMPED LIVERMORE EAST BASE 1947 RESET 1964 CEMENTED IN A DRILL HOLE IN THE TOP AND CENTER OF THE SOUTH CONCRETE HEADWALL OF A DOUBLE 48-INCH CONCRETE PIPE CULVERT, 146 FEET WEST OF THE CENTERLINE OF A STREET LEADING SOUTH, 143.0 FEET SOUTH OF THE SOUTH RAIL OF THE SOUTHERN PACIFIC COMPANY RAILROAD TRACK, 66.0 FEET SOUTH OF THE CENTERLINE OF THE PLEASANTON-LIVERMORE ROAD, 17.6 FEET WEST OF A FENCE CORNER, 0.3 FOOT NORTH OF A FENCE LINE, AND ABOUT 1 FOOT LOWER THAN THE ROAD.
01/01/1964 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1964 (LGB) THE STATION MARK, REFERENCE MARK 1 AND REFERENCE MARK 2 WERE RECOVERED, FOUND TO BE AS DESCRIBED IN 1947 AND IN GOOD CONDITION. THE ORIGINAL AZIMUTH MARK WAS FOUND TO HAVE BEEN DESTROYED AND A NEW MARK HAD BEEN ESTABLISHED THIS YEAR. REFERENCE MARK 3 WAS ESTABLISHED THIS YEAR. THE DISTANCES AND DIRECTIONS TO REFERENCE MARKS 1 AND 2 WERE FOUND TO COMPARE FAVORABLY WITH THE 1947 DATA. A NEW DESCRIPTION FOLLOWS. THE STATION IS 5-1/2 MILES EAST OF PLEASANTON, 1 MILE WEST OF LIVERMORE AND ON RAILROAD RIGHT-OF-WAY PROPERTY BETWEEN THE SOUTHERN PACIFIC AND WESTERN PACIFIC TRACKS. TO REACH THE STATION FROM THE TALL FLAG POLE AT THE INTERSECTION OF FIRST STREET AND 1ST S. IN LIVERMORE, DRIVE WEST ON FIRST STREET FOR 0.65 MILE TO A Y-FORK. KEEP THE RIGHT FORK, WEST, ON PLEASANTON ROAD FOR 0.75 MILE TO A LEFT TURN LANE IN THE PAVED ROAD AND A DIRT SIDE ROAD ON THE RIGHT. TURN RIGHT, NORTH, ACROSS THE SOUTHERN PACIFIC TRACKS, THENCE TURN RIGHT AND DRIVE EAST ON A TRACK ROAD BETWEEN RAILROAD TRACKS FOR 0.1 MILE TO THE SUMMIT OF A SMALL KNOLL AND THE STATION. THE STATION MARK IS A STANDARD DISK, STAMPED LIVERMORE EAST BASE 1947, SET IN THE TOP OF A CONCRETE MONUMENT WHICH IS 10 INCHES SQUARE AT THE TOP AND PROJECTS 2 INCHES ABOVE THE GROUND SURFACE. IT IS SITUATED 83.5 FEET SOUTH OF THE SOUTH RAIL OF THE WESTERN PACIFIC TRACKS, 53.7 FEET NORTH OF THE NORTH RAIL OF THE SOUTHERN PACIFIC TRACKS, 35.0 FEET NORTHEAST OF A TELEGRAPH POLE AND 3.5 FEET NORTH OF A WOODEN WITNESS POST. REFERENCE MARK 1, A STANDARD DISK STAMPED LIVERMORE EAST BASE NO 1 1947, IS SET IN THE TOP OF A CONCRETE POST WHICH IS 10 INCHES SQUARE AT THE TOP AND FLUSH WITH THE GROUND SURFACE. IT IS 93.7 FEET SOUTH OF THE SOUTH RAIL OF THE WESTERN PACIFIC TRACKS, 55.3 FEET NORTH OF THE NORTH RAIL OF THE SOUTHERN PACIFIC TRACKS AND 19.2 FEET NORTH-NORTHWEST OF A TELEGRAPH POLE. 1947, IS SET IN THE TOP OF A CONCRETE POST WHICH IS 10 INCHES REFERENCE MARK 2, A STANDARD DISK STAMPED LIVERMORE EAST BASE NO 2 1947, IS SET IN THE TOP OF A CONCRETE POST WHICH IS 10 INCHES SQUARE AT THE TOP AND FLUSH WITH THE GROUND SURFACE. IT IS 75 FEET SOUTH OF THE SOUTH RAIL OF THE WESTERN PACIFIC TRACKS, 53 FEET NORTH OF THE NORTH RAIL OF THE SOUTHERN PACIFIC TRACKS AND 20.8 FEET WEST OF A RAILROAD RIGHT-OF-WAY MARKER. REFERENCE MARK 3, A STANDARD DISK STAMPED LIVERMORE EAST BASE NO 3 1947, IS SET IN THE TOP OF A CYLINDRICAL CONCRETE MONUMENT, 12 INCHES IN DIAMETER AND PROJECTING 6 INCHES ABOVE THE GROUND SURFACE. IT IS SITUATED ON RIGHT-OF-WAY PROPERTY BETWEEN PLEASANTON ROAD AND THE SOUTHERN PACIFIC RAILROAD TRACKS, 33 FEET SOUTH OF THE SOUTH RAIL OF THE RAILROAD AND 9 FEET WEST OF A TELEPHONE POLE WITH A METAL WITNESS SIGN ATTACHED TO ITS SOUTH SIDE. THE AZIMUTH MARK, A STANDARD DISK STAMPED LIVERMORE EAST BASE 1947 RESET 1964, IS CEMENTED IN A DRILL HOLE IN A BRIDGE ABUTMENT ON THE SOUTH SIDE OF PLEASANTON ROAD. IT IS 66 FEET SOUTH OF THE CENTER OF THE ROAD, 17.5 FEET WEST OF THE EAST END OF THE CONCRETE ABUTMENT, 12.8 FEET EAST OF THE WEST END OF THE ABUTMENT AND 15.5 FEET EAST OF A NORTH-SOUTH FENCE. **TO REACH THE AZIMUTH MARK, CONTINUE WEST ON PLEASANTON ROAD FOR 0.15 MILE TO A DRAINAGE DITCH BENEATH THE ROAD AND THE MARK IN THE CONCRETE BRIDGE ABUTMENT ON THE LEFT.
01/01/1969 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1969 (WFF) THE STATION WAS RECOVERED AS DESCRIBED AND ALL MARKS WERE FOUND IN GOOD CONDITION. THE DESCRIPTION TO REACH THE STATION WAS COMPLETELY ADEQUATE. AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--ABOUT 1 MILE WEST OF LIVERMORE.
01/01/1974 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1974 (EP) STATION WAS RECOVERED IN GOOD CONDITION AS DESCRIBED, THE REFERENCE MARKS WERE NOT SEARCHED FOR, IN QUAD 371214, STATION 1048, JULY 1963, REVISED FEBRUARY 1965. AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--1 MILE WEST OF LIVERMORE
01/01/1974 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1974 RECOVERED IN GOOD CONDITION.
01/01/1976 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1976 (CLN) THE STATION MARK AND REFERENCE MARK 1 WERE RECOVERED IN GOOD CONDITION AND THE DISTANCE AND DIRECTION FROM THE STATION MARK TO REFERENCE MARK 1 MEASURED ON THIS DATE AGREED WITH THE PREVIOUS MEASUREMENTS. REFERENCE MARKS 2 AND 3 WERE FOUND BROKEN AND GRADED OUT OF THE GROUND AND THE AZIMUTH MARK SET IN 1964 WAS FOUND TO HAVE BEEN COVERED WITH A CONCRETE SIDEWALK. A NEW AZIMUTH MARK AND REFERENCE MARK 4 WERE ESTABLISHED ON THIS DATE. THE PREVIOUS DESCRIPTIONS ARE ADEQUATE WITH THE FOLLOWING ADDITIONS-- REFERENCE MARK 4 IS A C AND GS REFERENCE MARK DISK STAMPED LIVERMORE EAST BASE NO 4 1947 1976 SET IN THE TOP OF A 12-INCH CONCRETE CYLINDER PROJECTING 0.5 FOOT ABOVE THE GROUND AND IS 31.0 FEET SOUTH OF THE SOUTH RAIL OF THE SOUTHERN PACIFIC COMPANY RAILROAD TRACK, 7.8 FEET WEST OF A TELEPHONE POLE WITH A WITNESS SIGN ATTACHED TO IT, AND ABOUT 6-1/2 FEET HIGHER THAN THE STATION MARK. THE AZIMUTH MARK ESTABLISHED ON THIS DATE IS LOCATED BETWEEN THE SOUTHERN PACIFIC COMPANY AND WESTERN PACIFIC RAILROAD TRACKS AND IS AN NGS VERTICAL CONTROL DISK STAMPED K 832 RESET 1976 SET IN THE TOP OF A 12-INCH CONCRETE CYLINDER PROJECTING 0.3 FOOT ABOVE THE GROUND AND IS 165 FEET NORTHWEST OF THE CENTER OF THE T-INTERSECTION OF STANLEY BOULEVARD AND ISABEL AVENUE LEADING SOUTH, 75.8 FEET NORTH OF THE NORTH RAIL OF THE SOUTHERN PACIFIC COMPANY RAILROAD TRACK, 37.0 FEET NORTH OF MILEPOLE 45, 20.5 FEET SOUTH OF THE SOUTH RAIL OF THE WESTERN PACIFIC RAILROAD TRACK, 2.6 FEET SOUTHEAST OF A TELEGRAPH POLE, 1.5 FEET WEST OF A METAL WITNESS POST, AND ABOUT 3 FEET LOWER THAN THE SOUTHERN PACIFIC COMPANY RAILROAD TRACK. TO REACH THE AZIMUTH MARK FROM THE STATION SITE GO WEST ON STANLEY BOULEVARD 0.9 MILE TO THE MARK. AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN 1 MILE WEST OF LIVERMORE.
01/01/1976 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1976 RECOVERED IN GOOD CONDITION.
01/01/1978 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978 (JWB) THE STATION WAS RECOVERED IN GOOD CONDITION AS DESCRIBED. THE REFERENCE MARKS WERE NOT SEARCHED FOR. THE AZIMUTH MARK (RESET 1964) WAS SEARCHED FOR BUT NOT FOUND AND IS BELIEVED TO BE UNDER NEW CONCRETE SIDEWALK PUT OVER BRIDGE. AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN 1 MILE WEST OF LIVERMORE.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in March 1994. The horizontal coordinates are valid at the epoch date displayed above. The epoch date for horizontal control is a decimal equivalence of Year/Month/Day.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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