TranSystems Corporation - LGM Construction

Site Corrosivity Evaluation
TS Fedex Security Building
Project No. 94240/1
Reinforced Concrete
JDH Corrosion Consultants, Inc. 2
DISCUSSION
Due to moderately high levels of water-soluble sulfates found in these soils, a good
quality dense concrete should be used for the concrete slabs at this location. Type II
concrete mix with a maximum water-to-cement ratio of 0.50 should be utilized at this
site. Adhering to the minimum depth of cover for the reinforcing steel in the foundations
as specified in the Uniform Building Code is recommended for the subject structures.
Underground Metallic Pipelines
The soils at the project site are considered to be “moderately corrosive” to ductile/cast iron,
steel and dielectric coated steel based on the resistivity measurements. Therefore,
corrosion control in the form of coatings and cathodic protection is warranted for all buried
metallic pressure pipelines, such as domestic and fire water pipelines, planned for use at
this site depending upon the critical nature of the structures. All underground pipelines
should also be electrically isolated from above grade structures, reinforced concrete
structures and copper lines in order to avoid potential galvanic corrosion problems.
The extremely low value of REDOX potential indicates anaerobic conditions, suitable for
sulfate reducing bacteria and is considered to be corrosive to ductile/cast iron, steel and
dielectric coated steel.
LIMITATIONS
The conclusions and recommendations contained in this report are based on the
information and assumptions referenced herein. All services provided herein were
performed by persons who are experienced and skilled in providing these types of
services and in accordance with the standards of workmanship in this profession.
No other warrantees or guarantees, expressed or implied, are provided.
We thank you for the opportunity to be of service to Cooper Testing Laboratory on this
project and trust that you find the enclosed information satisfactory.
If you have any questions or if we can be of any additional assistance, please feel free to
contact us at (925) 927-6630.
Respectfully submitted,
Mohammed Ali
Mohammed Ali, P.E.
JDH Corrosion Consultants, Inc.
Principal
cc: File 28071