Prologis Park-CS170106 (2)
G EOTECHNICAL E NGINEERING
E NVIRONMENTAL C ONSULTING
C ONSTRUCTION M ATERIAL T ESTING
January 6, 2017
Mr. Casey Dillon
Prologis
2501 North Hardwood Street, Suite 2450
Dallas, Texas 75201
Re: Addendum #2 to Geotechnical Engineering Report
Proposed Prologis Park One Twenty One
Buildings 1, 2, 3 and 6
Near NWC of West Sandy Lake Rd and North Coppell Rd
Coppell, Texas
Rone Project No. 15-20061.1
Dear Mr. Dillon:
Rone Engineering Services, Ltd. (Rone) has been requested to provide additional recommendations
for pavements for the referenced project. This request was made by Mr. Casey Dillon with Prologis
on January 5, 2017. This letter should be considered an addendum to our referenced Geotechnical
Engineering Reports 15-20061.1 dated May 20, 2015 and 15-20061.2 dated June 2, 2015. This
letter should not be considered separately from the geotechnical reports.
Based on the information presented in Standard Detail 2290, Standard Construction Details, City of
Coppell, the City of Coppell requires fire lane pavements consist of a minimum 6-inch reinforced
concrete pavement supported on lime treated subgrade. The borings performed at the site indicate
the subgrade may consist of predominantly sandy soils. As stated in our reports,sandy soils will not
significantly benefit from lime treatment. Based on our experience and general industrial practice,
the concrete pavement thickness can be increased by one (1) inch in lieu of lime treatment in order
to provide a stronger pavement section. Fire lane pavements planned for this project will consist of
a minimum of 8-inch reinforced concrete pavement section. It is our opinion that an 8-inch
reinforced concrete section supported on compacted subgrade should be adequate to support the
anticipated fire lane traffic. Therefore, the lime treatment of the fire lane pavement subgrade is not
necessary for this project.
All other information presented in our original geotechnical reports remains unchanged.
Thank you for the opportunity to provide additional services to you for this project. Please call if you
have any questions regarding this letter.
Respectfully submitted,
Mark D. Gray, P.E.
Thusha P. Thushanthan, P.E.
Partner
Geotechnical Engineer
Texas Engineering Firm License No. F-1572
D ALLAS |F ORT W ORTH|A USTIN|S AN A NTONIO|H OUSTON