HomeMy WebLinkAboutCT 15-08; Carlsbad Ranch PA 5, Phase 3; Supplemental Geotechnical Recommendations Marbrisa Resorts - Phase 3, Grand Pacific Resorts, Carlsbad, CA; 2015-07-09.,
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July9, 2015
Geotechnical Engineering
______ C;;...o-.;.n'-'istruction Inspection
., ,..,.CORD COPY l\1aterials Testing
Environmental
Grand Pacific Resorts, Inc.
5900 Pasteur Court, Suite 200
Carlsbad, California 92008
MTGL Project No: 1916All
MTGL Log No: 15-1159
Attention:
Subject:
Reference:
Mr. Houston Arnold
SUPPLEMENTAL GEOTECHNICAL RECOMMENDATIONS
Marbirsa Resorts -Phase III
Grand Pacific Resorts
Carlsbad, California
MTGL, Inc. (2015). Geotechnical Investigation, Marbrisa Resorts -
Phase Ill, Grand Pacific Resorts, Carlsbad, California, MTGL Project
No. 1916A11 , Log No. 15-1063, April24.
Dear Mr. Arnold:
Per your request, we are providing supplemental geotechnical recommendations for
the Phase Ill project to be located at the Grand Pacific Resorts, Carlsbad, California.
We previously performed a geotechnical investigation of the site and presented our
results in the referenced report. This letter provides geotechnical recommendations
for any bio-retention basin or bio-swales that are planned for the site
Remedial grading is recommended for the site which will use the on-site soils as
compacted fill. The soils that are anticipated to be used as engineered fill consist of
silty sand, clayey sand and sandy clay. Based on our experience with the on-site soils,
the compacted fill materials are expected to have a very low permeability and very
low infiltration characteristics which would make them unsuitable for infiltration of
storm water runoff.
Any bio-retention basins or bio-swales that are planned for the site should be designed
by the project civil engineer. Due to site soil conditions any permanent bio-retention
basins should be lined with an impermeable barrier to prevent water infiltration in the
underlying soils.
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Marbrisa Resorts -Phase III
Carlsbad, California
MTGL Project No. 1916All
MTGL Log No. 15-1159
We appreciate this opportunity to be of continued service to you. Should you have any questions
regarding the infonnation contained herein, please contact us at your earliest convenience.
Respectfully submitted,
MTGL, Inc.
4,_ <rl{
Sam E. Valdez, RCE 56226, RGE 2813
Vice President I Engineering
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