N. Boca beach renourishment FDEP Inspection 11-13-14

8/10/2019 N. Boca beach renourishment FDEP Inspection 11-13-14

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Turbidity Monitoring ReportNorth Boca Raton Beach Renourishment

Permit No.: 0561499-004-JM

Date: 11/13/14 Collectors: K. Collins, C. Lambright

Time:1436

Dredge Status: actively discharging

Weather & Water Observations:

Seas Wind Speed Wind Direction Weather

1-2 ft 11 mph NE clear skies

Tidal Stage:

Ebbing High Tide Low Tide

1436Calibration verification with 10 NTU calibration solution. Result was 9.93 NTUs.

Compliance Station:

Surface (snorkeler) Surface (snorkeler) Surface (drone)

Water Depth 5.5 ft 4 ft 4 ft

Collection Depth 2 ft 2 ft 2 ft

Analysis Time 1457 1553 1553

Turbidity (NTUs) 39.4 34.1 33.0

Analysis Date 11/13/14 11/13/14 11/13/14

Lat/Long 26 23.175 N, 80 03.989 W

Background Station:

Surface Mid Bottom

Water Depth 6 ft

Collection Depth 2 ft

Analysis Time 1437

Turbidity (NTUs) 1.92

Analysis Date 11/13/14

Lat/Long 26 22.499 N, 80 04.026 W


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Additional Notes:

At 1400, DEP staff met with representatives from ACOE and Marinex. We used an ATV to drive down

the beach from the discharge point in order to view the turbidity plume. We then drove back to the

discharge point and gathered our gear. A GPS point was collected at the discharge point (26 23.037 N,

80 03.988 W). A GPS trip odometer was used to track 300 meters upcurrent of the discharge point. A

background sample was collected by snorkeler approximately past the wave break. The sample read

1.92 NTUs. We then went back to the discharge point, reset the trip odometer and used it to track

1,000 meters downcurrent of the discharge point. A compliance sample was collected by snorkeler

approximately past the wave break inside of the visible turbidity plume. The sample read 39.4 NTUs.

At 1545, DEP staff met with Ed Tichenor from Reef Rescue. We drove down to Red Reef Park and

collected simultaneous compliance samples by snorkeler and drone. A GPS point was collected at this

location (26 22.079 N, 80 04.079 W). The snorkeler collected sample read 34.1 NTUs and the drone

sample read 33.0 NTUs.

The next samples were collected by boat with the turbidity monitoring contractor (see next report).

Photos:

Photo 1: Looking east at the dredge discharge point on the beach. It was actively

pumping sand.


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Photo 2: Looking north at dredge discharge point on the beach.


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Photo 3: Looking east at the DEP snorkeler collecting the compliance sample. Note the

distance from her to the edge of the plume. The ACOE representative onsite stated that

the DEP snorkeler did not collect the compliance sample in the correct location and that

the sample should have been taken at the location of the buoys seen in distance (left

side of photo).


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Photo 4: Zoomed in shot of the DEP snorkeler collecting the compliance sample.


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Photo 5: Looking east at the DEP snorkeler collecting the compliance sample with the

drone.

N. Boca beach renourishment FDEP Inspection 11-13-14

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