25B5002 - Appendix G- Site Characterization Report - AOC Part 6.pdf

Virginia Port Authority November 9, 2009 (Project No. 3582.006)

INTRODUCTION

This appendix includes data from vibracore sampling conducted by Alpine Ocean Seismic survey, Inc. and prepared for the US Army Corps of Engineers, Norfolk District. A total of 6 vibracore explorations were conducted within the potential sand resource area of Atlantic Ocean Channel from October 9th- 12th, 1995. Geotechnical exploration logs were obtained from Alpine Ocean Seismic Survey, Inc. report, “Subsurface Investigation by Vibracoring for Sandbridge Beach and Virginia Beach Erosion Control and Hurricane Protection Project,” dated October 27, 1995, and entered into Fugro’s geotechnical exploration database for use in GIS analyses and interpretation.

Explorations were conducted from the R/V Atlantic Twin, an Alpine owned vessel, with a model 271 B Alpine Pneumatic Vibracore sampler. The sampler was configured to collect 20-foot-long core samples, which penetrated and recovered sediments to El. -70.9 ft. Samples were recovered in single vibratory runs.

Vibracore penetration logs with core descriptions from the original 1995 report are presented in this appendix. A note at the bottom of the log indicates the standardized exploration identification number that has been applied to each exploration and which is used throughout this report. For our standardized exploration identifiers, we have retained the original exploration number (e.g. 3), but have altered the prefix to include the year of the exploration and the type of exploration (e.g. 87V-3), where “V” represents a vibracore exploration. A summary of the vibracore explorations is presented in Table C-1. Table C-1, along with charts and figures presented in this report use Fugro’s standardized nomenclature.

Table C-1. 1995 Historical Vibracore Explorations

Coordinates Virginia State Plane, South Zone, NAD 83, Feet Exploration1 Type

Completion Date

Completion Depth (feet)

Northing Easting

Mudline

Elevation (feet)

(MLW)2

Mudline

Elevation (feet)

(MLLW)3

Location With

Respect to

Channel

95V-53 Vibracore 10/12/1995 19.0 3496301 12235684 -47.0 N/A4 Outside 95V-59 Vibracore 10/9/1995 20.0 3499251 12235294 -50.9 -52.7 Outside 95V-60 Vibracore 10/9/1995 19.0 3498619 12233382 -48.5 N/A4 Outside 95V-67 Vibracore 10/12/1995 20.0 3496073 12234266 -44.3 N/A4 Outside 95V-68 Vibracore 10/9/1995 9.2 3494377 12237933 -47.7 N/A4 Outside 95V-69 Vibracore 10/12/1995 19.0 3494041 12236849 -49.5 N/A4 Outside

1 Exploration designation prefixes used in this report (e.g. charts) have been modified from designations used in the original reports.

2 Mudline elevation at time of exploration.

3 Mudline elevation at exploration location estimated from 2007 survey.

4 Outside of survey area.

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APPENDIX D

1990 VIBRACORES

INTRODUCTION

This appendix includes data from vibracore sampling conducted by Exmar under contract to the US Army Corps of Engineers, Norfolk District. Data that is utilized in this report and is presented herein was obtained from the geotechnical data report, “Subsurface Investigation by Vibracoring, Atlantic Ocean Channel, Thimble Shoal Channel, and Off Sandbridge,” September and October of 1989, and June and July of 1990. A total of 162 vibracore explorations were conducted within areas of Thimble Shoal Channel, Atlantic Ocean Channel, and Sandbridge. Although 76 vibracore explorations were sampled within the potential sand resource area of Atlantic Ocean Channel, geotechnical and laboratory data was only available for 74 of these locations and is presented in this report.

Detailed logs were generated for a subset of the vibracore explorations (V-1A through V- 41A) by the USACE for the Virginia Sand Inventory Program, and are presented in the same format in which Fugro had originally received them. A note has been placed at the bottom of the log, which indicates the standardized exploration identification number that has been applied to each exploration and is used throughout this report. The remaining 33 vibracore exploration logs (V-43A through V-76A) were generated from Fugro’s geotechnical database. These vibracore logs include soil descriptions that have been modified based on available laboratory test results. Where laboratory test data results were available, Fugro has updated the soil classifications based on the test results and in general accordance with ASTM D-2487. Results from laboratory test data are also presented on the logs, including sample test depth interval, fines percent, and median grain size (D50) value.

Grain size data provided in the original reports were also entered into the geotechnical database. The laboratory summary table and grain size curve plates presented in this appendix were generated from the geotechnical database. The laboratory summary table provides soil classifications in general accordance with ASTM D-2487 along with depth intervals of laboratory tested samples, moisture content, specific gravity, dry unit weight, and moist unit weight. Depth intervals of laboratory tested samples, percentage of fines, median grain size (D50) values, and soil classifications in general accordance with ASTM D-2487 are displayed on the grain size curve figures. If the percent fines and D50 values were not provided in the original report, Fugro interpreted them from available grain size data.

For clarity purposes the logs, laboratory summary table, and grain size curves presented in this appendix contain standardized exploration identifiers. We have retained the original exploration number (e.g. 7A), but have altered the prefix to include the year that the report was issued, and the type of exploration (e.g. 90V-7A), where “V” represents a vibracore exploration.

A summary of the vibracore explorations is presented in Table D-1. Table D-1, along with charts and figures presented in this report use Fugro’s standardized nomenclature.

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Table D-1. 1990 Historical Vibracore Explorations

Coordinates Virginia State Plane, South Zone, NAD 83, Feet Exploration1 Type

Completion Date

Completion Depth (feet)

Northing Easting

1989/1990 Mudline

Elevation (feet)

(MLW)2

Mudline

Elevation (feet)

(MLLW)3

Location With

Respect to

Channel4

90V-01A Vibracore 9/30/1989 15.0 3499760 12240317 -58.6 -59.8 Within 90V-02A Vibracore 9/30/1989 16.0 3499462 12239953 -58.7 -61.1 Within 90V-03A Vibracore 9/30/1989 15.0 3498644 12240989 -57.5 -59.9 Within 90V-04A Vibracore 9/30/1989 15.0 3498194 12241875 -57.0 -60.0 Within 90V-05A Vibracore 9/30/1989 18.6 3496838 12241439 -53.2 -57.2 Outside 90V-06A Vibracore 9/30/1989 12.0 3497229 12242303 -54.4 -58.4 Within 90V-07A Vibracore 6/30/1989 19.8 3491645 12248066 -56.0 -55.5 Within 90V-08A Vibracore 6/30/1990 16.0 3491299 12248711 -54.0 -55.0 Within 90V-09A Vibracore 6/30/1990 16.2 3491088 12248237 -54.0 -54.9 Within 90V-10A Vibracore 6/30/1990 17.7 3490591 12249252 -54.0 -54.9 Within 90V-11A Vibracore 6/30/1990 12.0 3490230 12248755 -54.0 -54.6 Within 90V-12A Vibracore 6/30/1990 15.0 3489718 12254582 -53.9 -46.7 Outside 90V-13A Vibracore 10/10/1989 15.5 3488803 12250059 -51.9 -54.7 Within 90V-14A Vibracore 10/10/1989 16.5 3489108 12250438 -52.6 -54.9 Within 90V-15A Vibracore 10/10/1989 19.0 3487707 12251803 -52.3 -56.3 Within 90V-16A Vibracore 10/10/1989 14.5 3487372 12251529 -53.2 -55.4 Within 90V-17A Vibracore 10/10/1989 17.0 3486896 12252491 -52.5 -55.2 Within 90V-18A Vibracore 10/10/1989 17.5 3486460 12253677 -51.6 -55.1 Within 90V-19A Vibracore 10/10/1989 20.0 3486162 12253306 -49.5 -54.8 Within 90V-20A Vibracore 10/10/1989 19.3 3486127 12253794 -50.6 -55.6 Within 90V-21A Vibracore 10/10/1989 15.0 3486127 12253794 -52.8 -54.9 Within 90V-22A Vibracore 10/12/1989 18.0 3485835 12254816 -51.0 -55.4 Within 90V-23A Vibracore 10/12/1989 15.5 3485128 12255580 -51.3 -55.5 Within 90V-24A Vibracore 10/12/1989 18.6 3484375 12256262 -51.4 -55.1 Adjacent 90V-25A Vibracore 10/12/1989 20.0 3484801 12256510 -50.6 -54.9 Within 90V-26A Vibracore 10/12/1989 16.0 3484114 12257305 -49.8 -55.3 Within 90V-27A Vibracore 10/12/1989 19.5 3483401 12258058 -51.5 -54.8 Within 90V-28A Vibracore 10/11/1989 19.8 3483798 12258297 -50.7 -55.0 Within 90V-29A Vibracore 10/11/1989 20.0 3483105 12259017 -53.5 -55.0 Within 90V-30A Vibracore 10/11/1989 18.0 3482386 12259782 -53.6 -55.5 Within 90V-31A Vibracore 10/11/1989 20.0 3482782 12259959 -52.8 -56.0 Within 90V-32A Vibracore 10/11/1989 19.5 3482087 12260725 -51.7 -56.1 Within 90V-33A Vibracore 10/11/1989 18.0 3481375 12261478 -51.4 -55.2 Adjacent 90V-34A Vibracore 6/21/1990 16.0 3481774 12261662 -55.9 -55.2 Within 90V-35A Vibracore 6/21/1990 17.0 3481055 12262463 -58.0 -55.4 Within 90V-36A Vibracore 6/21/1990 15.0 3480346 12263258 -52.0 -55.6 Adjacent 90V-37A Vibracore 6/21/1990 17.8 3480756 12263467 -52.8 -56.4 Within 90V-38A Vibracore 10/16/1989 19.0 3479795 12265211 -53.2 -55.1 Within 90V-39A Vibracore 6/21/1990 19.0 3479402 12264931 -51.7 -54.6 Within 90V-40A Vibracore 10/16/1989 18.0 3478659 12266227 -50.5 -55.9 Within 90V-41A Vibracore 10/16/1989 15.0 3478097 12267124 -49.5 -55.1 Adjacent 90V-43A Vibracore 10/16/1989 17.0 3477739 12267988 -53.5 -56.4 Within 90V-44A Vibracore 10/16/1989 16.6 3477510 12269080 -56.2 -59.6 Within 90V-45A Vibracore 10/15/1989 19.0 3477065 12269926 -55.3 -55.9 Within 90V-46A Vibracore 10/15/1989 17.2 3476550 12269675 -51.7 -56.5 Adjacent

D-2

D-3

Coordinates Virginia State Plane, South Zone, NAD 83, Feet Exploration1 Type

Completion Date

Completion Depth (feet)

Northing Easting

1989/1990 Mudline

Elevation (feet)

(MLW)2

Mudline

Elevation (feet)

(MLLW)3

Location With

Respect to

Channel4

90V-47A Vibracore 10/15/1989 20.0 3475534 12271432 -50.7 -56.4 Adjacent 90V-48A Vibracore 10/15/1989 20.0 3475996 12271631 -49.4 -56.8 Within 90V-49A Vibracore 10/15/1989 16.5 3475284 12272393 -52.1 -56.2 Within 90V-50A Vibracore 10/14/1989 19.0 3474569 12273196 -54.7 -56.6 Adjacent 90V-51A Vibracore 10/14/1989 17.0 3475036 12273394 -52.2 -56.0 Within 90V-52A Vibracore 10/14/1989 20.0 3473982 12275106 -51.7 -55.3 Within 90V-53A Vibracore 10/14/1989 18.0 3473556 12274895 -52.8 -55.7 Adjacent 90V-54A Vibracore 10/14/1989 20.0 3472775 12276179 -56.5 -59.0 Adjacent 90V-55A Vibracore 10/13/1989 16.5 3473201 12276674 -56.4 -60.1 Within 90V-56A Vibracore 10/13/1989 15.0 3472473 12277777 -59.0 -60.4 Within 90V-57A Vibracore 10/13/1989 14.5 3472673 12277542 -56.7 -58.4 Within 90V-58A Vibracore 10/13/1989 17.8 3471736 12278564 -57.5 -62.0 Within 90V-59A Vibracore 6/21/1990 16.5 3479894 12264041 -53.0 -57.3 Adjacent 90V-60A Vibracore 6/22/1990 20.0 3481252 12263023 -57.0 -56.5 Within 90V-61A Vibracore 6/22/1990 16.5 3482413 12261149 -56.0 -55.7 Within 90V-62A Vibracore 6/22/1990 19.0 3473430 12275488 -54.0 -57.0 Within 90V-63A Vibracore 6/25/1990 17.5 3474500 12275504 -55.0 -55.6 Within 90V-64A Vibracore 6/25/1990 17.0 3474363 12274016 -58.0 -56.1 Within 90V-66A Vibracore 6/30/1990 18.0 3488266 12250857 -56.0 -55.7 Within 90V-67A Vibracore 6/30/1990 18.5 3479280 12265836 -58.0 -58.0 Within 90V-68A Vibracore 6/30/1990 17.5 3477109 12268754 -55.0 -58.9 Adjacent 90V-69A Vibracore 6/30/1990 19.0 3488328 12251590 -56.0 -56.1 Within 90V-70A Vibracore 7/10/1990 19.0 3472588 12276840 -55.2 -58.0 Within 90V-71A Vibracore 7/10/1990 16.5 3475559 12272858 -54.1 -54.9 Within 90V-72A Vibracore 7/10/1990 15.5 3475559 12272858 -54.1 -57.3 Within 90V-73A Vibracore 7/10/1990 15.5 3487104 12254055 -52.4 -54.5 Within 90V-74A Vibracore 7/10/1990 20.0 3487519 12252938 -52.0 -55.5 Within 90V-75A Vibracore 7/10/1990 15.5 3483610 12259515 -54.4 -55.5 Within 90V-76A Vibracore 7/10/1990 18.0 3476575 12272506 -50.9 -55.1 Adjacent

1 Exploration designation prefixes used in this report (e.g. charts) have been modified from designations used in the original reports.

2 Mudline elevation at time of exploration.

3 Mudline elevation at exploration location estimated from 2007 survey.

4 Adjacent means that exploration is within 200 feet of the navigation channel.

A