REPORT OF SURVEY 18-073 Duval SPP.PDF

SURVEYORS, INC

Surveyor’s Report For

Duval County SPP Topographic & Hydrographic Survey

Duval County, Florida #18-073

Prepared For:

U.S. Army Corps of Engineers, Jacksonville District Jacksonville, Florida Survey No. 17-070

Contract No. W912EP-15-D-0007

Prepared By:

Degrove Surveyors, Inc.

2131 Corporate Square Boulevard Jacksonville, Florida 32216

(904) 722-0400

Survey No.: 18-073

Note: This report and digital files are not full and complete without the other and are not valid without the signature and original raised seal of a Florida Licensed Surveyor and Mapper.

Degrove Surveyors Inc. project No.: 2018030 Jacksonville Corps of Engineers Survey No.: 18-073

Project Title: Duval County SPP Topographic and Hydrographic Survey Location: Duval County, Florida Date of Field Survey: 02/22/18 through 03/02/18 Date of Report: 03/05/118

Report:

The purpose of this survey was to perform a topographic and hydrographic survey of the Duval Beach of specific transects and to furnish deliverable files of the topographic data.

Limits of Survey:

The survey was limited to profiles at Range monuments R-40 through R-80 of the Duval County Monitoring System. In general the lines were surveyed from the 150 feet landward of the limits of the beach to 3000 seaward of the most seaward topographic data point.

Control:

The following Horizontal and Vertical Control Points were used: Points with a PID number (two letter and four number designation) were obtained from the National Geodetic Survey (NGS) database.

Control Point Name Y(Northing) Or Latitude

X(Easting) Or Longitude Elevations(feet)

BC 1553 R 67 2164713.35 533512.77 10.40

BC 0502 Y 324 2165066.67 533462.99 10.58

Mayport 1B (DSI Point from job 13- 056)

2204448.492 521414.095 9.91

Horizontal coordinates are referenced to the North American Datum of 1983 (2011), Florida State Plane Coordinate System, Florida East Zone, U.S. Survey Feet. Horizontal coordinates shown in bold italics were calculated from post-processed GPS static sessions.

Elevations are referenced to the North American Vertical Datum of 1988 (NAVD88) U.S. Survey Feet.

Quality assurance for topographic data was accomplished by comparing daily RTK/GPS check measurements to known values at control points. See Table 1

Field Methodology:

1) Two NGS control points were recovered near the project area, only one of which had horizontal coordinates. These points were augmented with five NGS Continually Operating Reference Stations (CORS). Static sessions were completed on all four points and then post-processed with CORS data.

The horizontal positions of the control points were determined from this process. The Network Adjustment Report files are included with the raw data. Elevations for control points were held as published except for the Degrove control point “Mayport 1B”. The elevation was determined by a differential level run completed for Survey #13-056.

2) RTK units were used to collect data along Range lines for the upland and wading portions of the project.

3) The Hydrographic Survey was completed utilizing RTK/GPS, POS MV Surfmaster inertial measurement unit, and Odom CV 100M fathometer. The vertical component was verified on land twice daily (when possible) at a control point. Calibration and quality assurance data was collected daily and recorded in Hypack line files. The data files are referenced in the field notes. Sound Velocity profiles were captured using an Odom Digi-Bar Velocimeter. Data was collected with Hypack 2017.

4) In all cases RTK/GPS measurements were verified daily against existing control points for horizontal and vertical accuracy.

5) The upland survey overlapped (when possible) the hydrographic survey to verify accuracy.

6) Static sessions (RTK Infill) were run at the RTK/GPS base station during upland RTK/GPS data collection and were submitted to OPUS for verification and quality assurance.

7) ASCII files were formed from raw/processed data from equipment used in collection.

Office Methodology:

Data files were received daily from the field crews. The following procedures were followed:

1) Daily field checks to control points were reviewed to confirm the horizontal and vertical accuracy.

2) RTK infill was collected at the base point, processed by OPUS and compared to previous data.

3) Hypack 2017 was used to process hydrographic data. Hydrographic data was sorted at a ten-foot interval.

4) Coordinate files were obtained from the RTK data collectors and converted to ASCII files.

5) Hypack files and ASCII files were combined to produce the final data used in producing the final ASCII files.

Notes:

Due to unfavorable surf conditions overlap of hydrographic data and topographic data was in some cases minimal or could not be achieved.

Deliverables:

1) Raw data including RTK and Static GPS files and Hypack files.

2) An ASCII file containing hydrographic data sorted at a three-foot interval. File name: 18-073_Hydro.xyz

3) An ASCII file containing topographic data. File name: 18-073_Topo.xyz.

4) ASCII files 18-073_Topo.xyz and 18-073_Hydro.xyz were merged. The overlap area between hydro and topo data has been edited to remove hydro data. File name: 18-073_DTM.xyz.

5) Metadata files: 18-073.gen and 18-073.htm.

6) A PDF file of the Field Book. File name: FB-18-073.pdf

7) OPUS solutions

8) Surveyors Report. File name: REPORT OF SURVEY 18-073 Duval Beach.pdf

Certification:

I certify that this survey meets the requirements of the Florida Professional Standards for Surveying and Mapping, Chapter 5J-17, F.A.C. and Chapter 472 F.S. and the U. S. Army Corps of Engineers Manual for Hydrographic Surveys, Manual EM1110-2-1003, dated 30 Nov 13, Chapter 3, Table 3-1 Project Classification Other General Surveys and Studies and the Florida Department of Environmental Protection Standards for Beach Profiling Study Surveys.

Gordon R. Niles, P.S.M. #4112 Degrove Surveyors, Inc. Licensed Business #4603

Table 1 RTK/GPS Quality Assurance Checks

RTK checks Northing Easting Elevation Description Base at 3

Control Point

3 2164713.35 533512.77 10.40 BC1553 R 67

Base Receiver Location

5 2165066.67 533462.99 10.58 BC0502 Y 324 Check-In Point

2204448.49 521414.10 9.91 Mayport 1B checks to Y324

Point # Northing Easting Elevation Hor. Check Vert. Check Delta N Delta E Delta Z Date

10000 2165066.684 533462.918 10.603 0.07 -0.02 -0.009 0.068 -0.023 2/26/2018

10575 2165066.665 533462.914 10.586 0.07 -0.01 0.010 0.072 -0.006 2/26/2018

20000 2165066.692 533462.943 10.591 0.05 -0.01 -0.017 0.043 -0.011 2/26/2018

20604 2165066.691 533462.981 10.585 0.02 -0.01 -0.016 0.005 -0.005 2/26/2018

20605 2165066.719 533462.901 10.587 0.10 -0.01 -0.044 0.085 -0.007 2/27/2018

21436 2165066.612 533462.903 10.547 0.10 0.03 0.063 0.083 0.033 2/27/2018

10576 2165066.693 533462.952 10.527 0.04 0.05 -0.018 0.034 0.053 2/27/2018

11164 2165066.591 533462.958 10.572 0.09 0.01 0.084 0.028 0.008 2/27/2018

21437 2165066.679 533462.978 10.548 0.01 0.03 -0.004 0.008 0.032 3/1/2018

11312 2165066.656 533462.96 10.599 0.03 -0.02 0.019 0.026 -0.019 3/1/2018

11313 2165066.703 533463.003 10.603 0.03 -0.02 -0.028 -0.017 -0.023 3/2/2018

11416 2165066.68 533462.94 10.608 0.05 -0.03 -0.005 0.046 -0.028 3/2/2018 avg 0.0543 0.0003 std dev 0.0312 0.0260 std dev @ 95% confidence level 0.0612 0.0509