A2_-_Attachment_1_GPR_locks.pdf
PDF 783 KB Posted
- Attached to
- Cape Fear Lock & Dam Debris Removal Federal contract opportunity
- Solicitation number
- W912PM17T0091
About this file
Attachment 1 GPR Locks
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| A21_-_Questions_and_Answers_1.pdf | ||
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Text version
NC Registered Engineering Firm # F-1078
August 8, 2017
US Army Corps of Engineers 232 Battleship Road Wilmington, NC 28401
Dana Matics
Lock and Dam 2 and 3 GPR services
Location:
Permits:
22:25698
Highway 87
Elizabethtown NC, NC
RE:
ECS Job #
ATTN:
6714 Netherlands Drive Wilmington, NC 28405
(910) 686-9114 [Phone]
(910) 686-9666 [Fax]
ECS Southeast, LLP
LETTER OF TRANSMITTAL
ENCL:
We are enclosing:
Materials Engineering Division Reports For your use As requested
X X X
Field Report # 1 08/08/2017
Harry SlaterKris J. Stamm Office Manager, Principal Project Manager
1000.1
This report (and any included attachments) shall not be reproduced, except in full, without the prior written approval of ECS.
NC Registered Engineering Firm # F-1078
ECS Southeast, LLP
22:25698
Lock and Dam 2 and 3 GPR services Tuesday 08/08/2017
Project No.
Report No.
Day & DateProject
6714 Netherlands Drive Wilmington, NC 28405
(910) 686-9114 [Phone]
(910) 686-9666 [Fax]
FIELD REPORT
5.50
The undersigned arrived on site, as requested, to perform a Ground Penetrating Radar (GPR) scan of the concrete areas at lock and dams 2 and 3. The purpose of these activities was to determine if the soils beneath the concrete appeared to be stable.
Utilizing a GSSI SIR3000 with a 400 MHz antenna the areas were scanned. A grid pattern was set and runs were made parallel to each other. At the time of our services, the ground was dry at lock 2 and there was standing water on some of the areas at lock 3.
The area at lock 3 was scanned and there were 2 locations that showed anomalies indicative of loose soils. Please see the attached sketch for the approximate areas. The north end had some east/west cracking in the concrete. This along with the anomalies observed indicate some minor settlement in the soils at this time. The south end area in question had a majority of the area under water. It was also visible that the concrete had settled several inches. There appears to be significant settlement of the soils in this area. We recommend performing geotechnical borings in this area to determine how loose these soils are and determining a plan to stabilize the concrete.
The area at lock 2 was scanned and we did not observe any anomalies indicative of soft soils.
The concrete also appeared to be stable with minimal cracking and no visible signs of settlement.
74°/ Cloudy
2.50
0.00
0.00
09:30A 12:00P
Location
On-Site Time
Lab Time
Client
Elizabethtown NC, NC
Arrival Departure
Summary of Services Performed (field test data, locations, elevations & depths are estimates) & Individuals Contacted.
US Army Corps of Engineers - Dana Matics
Trip Charges*
Remarks
Chargeable Items
Weather
191Mileage*
3.00Travel Time*
Total
Time of
Re Obs.Time
* Travel time and mileage will be billed in accordance with the contract.
Tolls/Parking*
Harry Slater, — Project ManagerBy 1300
1098956
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