HomeMy WebLinkAboutBLDR-2-11-15345 Engr Report 8-5-11.tif -� ECS Carolinas, LLP
4811 Koger Boulevard
Greensboro, NC 27407
(336) 856 -7150 LETTER OF TRANSMITTAL
(336) 856 -7160
August 8, 2011 RE: 1013 14th Ave. Drive NW -GPR
Paramount Automotive Group ECS Job # 09:20100
1205 S. Center Street Permits:
Hickory, NC 28602
Location: Hickory, NC
ATTN: Mr. Danny C Jordan
We are enclosing:
X Materials Engineering Division Reports
X For your use
X As requested
ENCL:
Field Report # 1 08/05/2011 GPR Testing
ECS Carolinas, LLP
4811 Koger Boulevard
Eno Greensboro,
36)8W- 7 150 27407
(3 FIELD REPORT
36)856 -150
(336) 856 -7160
Project No. 09:20100
NC Registered Engineering Firm # F -1078 Report No. 1
Project 1013 14th Ave. Drive NW -GPR Day & Date Friday 08/05/2011
Location Hickory, NC Weather 85 Cloudy
Client Paramount Automotive Group - Danny C. Jordan On -Site Time 0.75
Lab Time 0.25
Travel Time* 0.50
Total 1.50
Remarks GPR Testing Re Obs.Time 0.00
Trip Charges* Tolls /Parking* Mileage* 25 Time of Arrival Departure
Chargeable Items 1 - GPR Equipment Rental 03:OOP 03:45P
* Travel time and mileage will be billed in accordance with the contract.
Summary of Services Performed (field test data, locations, elevations & depths are estimates) & Individuals Contacted.
The undersigned arrived on -site, as requested, to perform a Ground Penetrating Radar (GPR)
structural survey on a slab on grade.
The purpose of this survey was to determine the placement and spacing of reinforcing steel and
to determine slab thickness.
Utilizing the GPR unit to observe the 11 ft. x 24 ft. slab, three areas were scanned across the
slab to determine thickness and placement of reinforcement. Two other areas were scanned
across the slab edge to observe if there was a turn down with reinforcement.
The slab average 7 inches with welded wire reinforcement and a 12 inch turn down section was
observed along the perimeter with two additional bars in the turn down footing. This was
pointed out to the site representative Danny Jordan.
As explained in the note below, many factors can influence the quality and the value of the GPR
imagery. For this project, the observed results appeared to be good.
Engineer's Note on GPR Limitations: Successful use of GPR is dependent upon site conditions
that may not be determined until actual testing begins. The presence of highly- conductive
materials within the concrete may adversely affect GPR results. Green concrete ( <28 days old)
is relatively damp; the conductive nature of wet concrete can limit the depth that the GPR signal
can penetrate. GPR can detect steel members within concrete; however, GPR cannot determine
the specific nature of the detected steel members (i.e., GPR does not differentiate between
rebar, post- tension cables, metal conduit, etc.). GPR cannot determine reinforcing st eel b s ize.
By Alan L. Raulston, — CMT Project Manager 1510
271405
ECS Carolinas, LLP
4811 Koger Boulevard
Ei!a Greensboro,
36)8 7150 27407 FIELD REPORT
(336) 856 -7150
(336) 856 -7160
Project No. 09:20100
NC Registered Engineering Firm # F -1078 Report No. 1
Project 1013 14th Ave. Drive NW -GPR Day & Dat Friday 08/05/2011
Closely- spaced reinforcing steel may produce results that "mask" the presence of other
reinforcing steel bars or metal conduit within the concrete. Metal conduit can be detected using
GPR; however, PVC or plastic conduit may only be faintly observable. Water can interfere with
GPR technology, and the testing surface should be dry when performing GPR testing.
L - C AR
David M. Cutter, P.E. AV6i Z_ Alan L. Raulston
Principal Eng9r. 22089 CMT Project Manager
. 4,
By Alan L. Raulston, — CMT Project Manager 1510
Page 2
271405