U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 9 Station ID: 9415124 PUBLICATION DATE: 12/10/2004 Name: HAMILTON AFB OUTSIDE GAUGE CA NOAA Chart: 18654 Latitude: 38° 2.9' N ( 38.04830) USGS Quad: Petaluma Point Longitude: 122° 29.9' W (-122.49800) To reach the tidal bench marks traveling north on Highway 101 from San Rafael, take the Hamilton part of the Alameda Del Prado exit, turn right on Main Gate Road, then right on South Palm Drive, then right on Hamilton Parkway. Go right at traffic circle and take Sunset Drive, then left at stop sign to Las Lomas Drive and then proceed to traffic circle and take Caliente Real Road. Go right at bottom of hill and proceed until road gets to edge of slough adjacent to San Francisco Bay. The bench marks are located in the vicinity along the road leading to approach lights and also along the road leading to rescue towers. The tide station is on the wooden pier at the offshore end of the slough. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 5126 D 2000 DESIGNATION: 941 5126 D MONUMENTATION: Flange-encased Rod VM#: 16227 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 38° 2.9' N ( 38.04830) LONGITUDE: 122° 29.9' W (-122.49800) The primary bench mark is a flanged encased rod mark, set in a grass triangle area between Casa Grande Real and Las Lomas Drive, located at the U.S. Coast Guard housing area in San Rafael, 20 m (65 ft) south of the north point of the triangle, 15.30 m (50.2 ft) west of a fire plug in front of house on 293 Casa Grande Real, 8 m (27 ft) east of the centerline of Las Lomas Drive. The datum point is set 7 cm (0.25 ft) below ground, being the top of a stainless steel rod driven 2.7 m (9 ft) to refusal, and encased with a 5'" logo cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 9 Station ID: 9415124 PUBLICATION DATE: 12/10/2004 Name: HAMILTON AFB OUTSIDE GAUGE CA NOAA Chart: 18654 Latitude: 38° 2.9' N ( 38.04830) USGS Quad: Petaluma Point Longitude: 122° 29.9' W (-122.49800) T I D A L B E N C H M A R K S BENCH MARK STAMPING: HAMILTON FIELD 2 1951 DESIGNATION: 941 5126 HAMILTON FIELD 2 MONUMENTATION: Bench Mark disk VM#: 16219 AGENCY: US Army Corps of Engineers (USE) IDB PID#: JT2533 SETTING CLASSIFICATION: Concrete pavement OPUS PID: LATITUDE: 38° 2.9' N ( 38.04830) LONGITUDE: 122° 29.9' W (-122.49800) The bench mark is a brass disk set in concrete pavement near U.S Coast Guard housing above Hamilton AFB, 50m (165 ft) ESE down the slope from the Admirals quarters on Casa Grande street, 31 m (102 ft) from the point, 11 m (35 ft) above tide flats, and 2 m (8 ft) SE of a lone scrub oak tree. BENCH MARK STAMPING: STA ONE 1986 67TH ENGR DESIGNATION: 941 5126 STA ONE 67 ENGR MONUMENTATION: Bench Mark disk VM#: 16220 AGENCY: US Army Corps of Engineers (USE) IDB PID#: SETTING CLASSIFICATION: Concrete pad OPUS PID: LATITUDE: 38° 2.9' N ( 38.04830) LONGITUDE: 122° 29.9' W (-122.49800) The bench mark is a brass disk set in a 2.45 m x 2.15 m (7.0 ft x 8.0 ft) concrete pad resting on the remains of Hamilton AFB rescue tower pier, 0.64 km (0.4 mi) east of the Marin County Sheriff Warehouse Building #82, 53 m (174 ft) north of east end of cyclone fence, 21 m (69 ft) south of centerline of a road leading to approach lights, 1.80 m (5.9 ft) west of east face of concrete pad, 1.65m (5.4 ft) north of south edge of pad, and 0.8 m (2.6 ft ) above landing adjacent to pier.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 9 Station ID: 9415124 PUBLICATION DATE: 12/10/2004 Name: HAMILTON AFB OUTSIDE GAUGE CA NOAA Chart: 18654 Latitude: 38° 2.9' N ( 38.04830) USGS Quad: Petaluma Point Longitude: 122° 29.9' W (-122.49800) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5126 A 2000 DESIGNATION: 941 5126 A MONUMENTATION: Tidal Station disk VM#: 16224 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete drain foundation OPUS PID: LATITUDE: 38° 2.9' N ( 38.04830) LONGITUDE: 122° 29.9' W (-122.49800) The bench mark is a red-brass disk set in the SW corner of a storm drain on Hamilton AFB north of road leading to rescue tower, 143 m (470 ft) east of the Marin County Sheriff Warehouse building #82, 9.00 m (29.5 ft) north of centerline of road, 2.01 m (6.6 ft) SW from NE face, and 0.5 m (1.6 ft) above ground. BENCH MARK STAMPING: 5126 B 2000 DESIGNATION: 941 5126 B MONUMENTATION: Tidal Station disk VM#: 16225 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete culvert OPUS PID: LATITUDE: 38° 2.9' N ( 38.04830) LONGITUDE: 122° 29.9' W (-122.49800) The bench mark is a red-brass disk set in west elbow of a concrete irrigation culvert on Hamilton AFB at the corner of Hanger Avenue and the road leading to the rescue tower, 0.2 km (0.1 mi) west of a cyclone gate, 19 m (62 ft) east of the centerline of Hanger Avenue, 2.59 m (8.5 ft) east of NE corner of a storm grate, and 0.3 m (1.0 ft) below grade.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 9 Station ID: 9415124 PUBLICATION DATE: 12/10/2004 Name: HAMILTON AFB OUTSIDE GAUGE CA NOAA Chart: 18654 Latitude: 38° 2.9' N ( 38.04830) USGS Quad: Petaluma Point Longitude: 122° 29.9' W (-122.49800) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5126 C 2000 DESIGNATION: 941 5126 C MONUMENTATION: Tidal Station disk VM#: 16226 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete storm drain OPUS PID: LATITUDE: 38° 2.9' N ( 38.04830) LONGITUDE: 122° 29.9' W (-122.49800) The bench mark is a red-brass disk set in a concrete storm drain on Caliente Real near Hamilton AFB and U.S. Coast Guard housing area, 108 m (354 ft ) west of centerline of Hanger Avenue, 90 m (295 ft) east of NE corner of a utility shed at the top of Caliente Real, 4.21 m (13.8 ft) north of centerline of Caliente Real, and 0.21 m (0.7 ft) above grade. BENCH MARK STAMPING: 5126 E 2000 DESIGNATION: 941 5126 E MONUMENTATION: Flange-encased Rod VM#: 16228 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 38° 2.9' N ( 38.04830) LONGITUDE: 122° 29.9' W (-122.49800) The bench mark is a flanged encased rod mark located on Hamilton AFB near rescue tower, 0.8 km (0.5 mi) east of the Marin County Sheriff training warehouse building # 82, 26 m (85 ft) SE of centerline of a road leading to approach lights, 25m (82 ft) north of north bank of channel leading to rescue tower, and 0.70 m (2.3 ft) north of an orange NOS witness post. The datum point is set 7 cm (0.25 ft) below ground, being the top of a stainless steel rod driven 28.7 m (94 ft) to refusal, and encased in a 5" logo cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 9 Station ID: 9415124 PUBLICATION DATE: 12/10/2004 Name: HAMILTON AFB OUTSIDE GAUGE CA NOAA Chart: 18654 Latitude: 38° 2.9' N ( 38.04830) USGS Quad: Petaluma Point Longitude: 122° 29.9' W (-122.49800) T I D A L B E N C H M A R K S BENCH MARK STAMPING: DESIGNATION: 941 5126 BOLT ALIAS: ALL THREAD MONUMENTATION: Bolt VM#: 16229 AGENCY: Unknown IDB PID#: SETTING CLASSIFICATION: Concrete utility vault OPUS PID: LATITUDE: 38° 2.9' N ( 38.04830) LONGITUDE: 122° 29.9' W (-122.49800) The bench mark is a 1/2 x 4 inch bolt end, protruding from a concrete utility vault on the road leading to rescue tower and approach lights at Hamilton AFB, 0.3 km (0.2 mi ) east of the Marin County Sheriff Warehouse building #82, 115 m (377 ft) west of a fork in road, 16.8 m (55.1 ft) north of centerline of road, 1.31 m (4.3 ft) east of NW face of vault, 1.28 m (4.2 ft) SW of NE face of vault, 0.49 m (1.6 ft) NE of SW face of vault, and 0.27 m (0.9 ft) above grade. BENCH MARK STAMPING: NO 5 MONUMENTATION: Bench Mark disk VM#: 16231 AGENCY: US Army Corps of Engineers (USE) IDB PID#: JT0811 SETTING CLASSIFICATION: Window sill OPUS PID: LATITUDE: 38° 2.9' N ( 38.04830) LONGITUDE: 122° 29.9' W (-122.49800) The bench mark is a disk set in the window sill at NW face at the NE corner of Hangar NO 1, at the U.S. Coast Guard station, 40 m (130 ft) WSW of bench mark T736 1944, 2.10 m (6.9 ft) SW of the NE corner of the Hangar, 0.15 m (0.5 ft) SE of the NW edge of the window sill, and 0.91 m (3.0 ft) above ground. Note: The access to Coast Guard base is restricted, contact the USCG Pacific Strike Team at (415) 883-3311 for access to tide station and bench marks.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 9 Station ID: 9415124 PUBLICATION DATE: 12/10/2004 Name: HAMILTON AFB OUTSIDE GAUGE CA NOAA Chart: 18654 Latitude: 38° 2.9' N ( 38.04830) USGS Quad: Petaluma Point Longitude: 122° 29.9' W (-122.49800) T I D A L B E N C H M A R K S BENCH MARK STAMPING: T 736 1944 MONUMENTATION: Bench Mark disk VM#: 16232 AGENCY: National Geodetic Survey (NGS) IDB PID#: JT0813 SETTING CLASSIFICATION: Window sill OPUS PID: LATITUDE: 38° 2.9' N ( 38.04830) LONGITUDE: 122° 29.9' W (-122.49800) The bench mark is a disk set in the window sill at the northwest corner of Hangar NO 1 in the window sill, at the U.S. Coast Guard station, 40 m (130 ft) WSW of bench mark NO 5, 2.10 m (6.9 ft) NE of the NW corner of the Hangar, 0.15 m (0.5 ft) SE of the NW edge of the window sill, and 0.91 m (3.0 ft) above ground. Note: The access to Coast Guard base is restricted, contact the USCG Pacific Strike Team at (415) 883-3311 for access to tide station and painted bench mark.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 9 Station ID: 9415124 PUBLICATION DATE: 12/10/2004 Name: HAMILTON AFB OUTSIDE GAUGE CA NOAA Chart: 18654 Latitude: 38° 2.9' N ( 38.04830) USGS Quad: Petaluma Point Longitude: 122° 29.9' W (-122.49800) T I D A L D A T U M S Tidal datums at HAMILTON AFB OUTSIDE GAUGE based on: LENGTH OF SERIES: 2 Months TIME PERIOD: February 2000 - March 2000 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 9414863 RICHMOND, CHEVRON OIL PIER Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 1.842 MEAN HIGH WATER MHW = 1.662 MEAN TIDE LEVEL MTL = 0.999 MEAN SEA LEVEL MSL = 0.986 * NATIONAL GEODETIC VERTICAL DATUM NGVD29 = 0.752 MEAN LOW WATER MLW = 0.332 MEAN LOWER LOW WATER MLLW = 0.000 * North American Vertical Datum NAVD88 = -0.064 * The NAVD 88 value was derived through GPS observations performed by the National Geodetic Survey (NGS). The NGVD 29 value was derived from one leveled geodetic bench mark. North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 5126 D 2000 11.803 10.141 HAMILTON FIELD 2 1951 11.454 9.792 STA ONE 1986 67TH ENGR 3.879 2.217 5126 A 2000 -0.316 -1.978 5126 B 2000 0.080 -1.582 5126 C 2000 8.087 6.425 5126 E 2000 1.710 0.048 941 5126 BOLT -0.706 -2.368 NO 5 1.298 -0.364 T 736 1944 1.297 -0.365
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 8 of 9 Station ID: 9415124 PUBLICATION DATE: 12/10/2004 Name: HAMILTON AFB OUTSIDE GAUGE CA NOAA Chart: 18654 Latitude: 38° 2.9' N ( 38.04830) USGS Quad: Petaluma Point Longitude: 122° 29.9' W (-122.49800) Foot Notes: Due to extensive mud flats at the gauge site, tidal datums are based on non-continuous time segments which only include periods when the full range of tide was observed.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 9 of 9 Station ID: 9415124 PUBLICATION DATE: 12/10/2004 Name: HAMILTON AFB OUTSIDE GAUGE CA NOAA Chart: 18654 Latitude: 38° 2.9' N ( 38.04830) USGS Quad: Petaluma Point Longitude: 122° 29.9' W (-122.49800) D E F I N I T I O N S Mean Sea Level (MSL) is a tidal datum determined over a 19-year National Tidal Datum Epoch. It pertains to local mean sea level and should not be confused with the fixed datums of North American Vertical Datum of 1988 (NAVD88). NAVD88 is a fixed datum derived from a simultaneous, least squares, minimum constraint adjustment of Canadian/Mexican/United States leveling observations. Local mean sea level observed at Father Point/Rimouski, Canada was held fixed as the single initial constraint. NAVD88 replaces NGVD29 as the national standard geodetic reference for heights. Bench mark elevations relative to NAVD88 are available from NGS through the World Wide Web at National Geodetic Survey. NGVD29 is a fixed datum adopted as a national standard geodetic reference for heights but is now considered superseded. NGVD29 is sometimes referred to as Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological Survey Topographic Quads. NGVD29 was originally derived from a general adjustment of the first-order leveling networks of the U.S. and Canada after holding mean sea level observed at 26 long term tide stations as fixed. Numerous local and wide-spread adjustments have been made since establishment in 1929. Bench mark elevations relative to NGVD29 are available from the National Geodetic Survey (NGS) data base via the World Wide Web at National Geodetic Survey. NAVD88 and NGVD29 are fixed geodetic datums whose elevation relationships to local MSL and other tidal datums may not be consistent from one location to another. The Vertical Mark Number (VM#) and PID# shown on the bench mark sheet are unique identifiers for bench marks in the tidal and geodetic databases, respectively. Each bench mark in either database has a single, unique VM# and/or PID# assigned. Where both VM# and PID# are indicated, both tidal and geodetic elevations are available for the bench mark listed. The NGS's Integrated Data Base (IDB PID) provides geodetic datum based on traditionally leveled and bluebooked ties to the National Spatial Reference System(NSRS) https://www.ngs.noaa.gov/datasheets/. The NGS Online Positioning User Service (OPUS PID) provides geodetic datum based on GPS position & tie it to the NSRS https://www.ngs.noaa.gov/OPUS/. The NAVD88 elevation is shown on the Elevations of Tidal Datums Table Referred to MLLW only when two or more of the bench marks listed have NAVD88 elevations. The NAVD88 elevation relationship shown in the table is derived from an average of several bench mark elevations relative to tide station datum. As a result of this averaging, NAVD88 bench mark elevations computed indirectly from the tidal datums elevation table may differ slightly from NAVD88 elevations listed for each bench mark in the NGS database.