Presidio 100 Tech Memo-Geotech Appendix 20100602.pdf

Urban Levee Remediation Design Presidio, Texas Contract No.IBM09D0006 Order No. IBM10T0008

URBAN LEVEE REMEDIATION

DESIGN MEMORANDUM

APPENDIX D

Geotechnical Investigation Technical Memorandum

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Raba• Engineers, Geologists, Hygienists and Environmental Scientists

GEOTECHNICAL INVESTIGATION

FOR

URBAN LEVEE REMEDIATION DESIGN

PRESIDIO FLOOD CONTROL LEVEE SYSTEM

FROM STA 0+000 TO STA 13+500

PRESIDIO COUNTY, TEXAS

USIBWC CONTRACT NO. IBM09D0006

USIBWC TASK NO.IBM10T0008

TECHNICAL MEMORANDUM

San Antonio, TX

EIPaso,TXBrownsville, TXAustin, TX

Houston, TX McAllen, TX Mexico

Engineering ' Testing' Environmental- Facilities ' Infrastructure

Project No. ASA09-120-00 March 26, 2010

Mr. Yen Hsu Chen, P.E., Principal Project Manager Tetra Tech, Inc.

17770 Cartwright Road, Suite 500 Irvine, California 92614

RE: Geotechnical Investi gation Urban Levee Remediation Design Presidio Flood Control Levee System From STA 0+000 to STA 13+500 Pres idio County, Texas USIBWC Contract No. IBM09D0006 USIBWC Task No. IBM10T0008 Techn ica l Memorandum

Dear Mr. Chen:

Raba-Klstner Consu ltants. Inc.

12821 W. Golden Lane

San Antonio, Texas 78249

(210) 699·909 0 ' FAX (210) 699-6 426

www.rkci.com TBPE Firm F·3257

Raba-Kistner Consultants, Inc. (R-K) is pleased to submit our Technical Memorandum for the geotechnical investigation of the Presidio Flood Control Levee System from STA 0+000 to STA 13+500 in Presidio County , Texas. This Technical Memorandum specifically addresses the techniques and testing procedures used to perform the subsurface exploration , testing, and analysis. These services were performed in accordance with the executed Subconsultant Professional Services Agreement between Tetra Tech, Inc. (CLIENT) and R-K for the above-referenced indefinite delivery - indefinite quantity contract (IOIQ) with the United States International Boundary and Water Commission (USIBWC). Notice to proceed was received by our office on December 15, 2009.

The purpose of this study was to drill borings along the existing alignment of the levee to supplement the previous field and laboratory analyses performed by R·K, to perform laboratory testing to further classify and characterize subsurface conditions, to perform resistivity surveys, and to prepare a Technical Memorandum presenting geotechnical recommendations for repair options along the levee in general accordance with the U.S. Army Corps of Engineers (USACE) document Engineering Manual (EM) 1110-2-1913 Design and Construction of Levees and the Federal Emergency Management Agency (FEMA) Requirements for Mapping Levees (44 CFR 65.10) as they pertain to geotechnical evaluations.

We appreciate the opportunity to be of service on this project, and look forward to working with you throughout the remaining phases. If you have any questions, please call.

Very truly yours, Attachments

RLT/JTS/JAF/CLS/jg

RABA-KISTNER CONSULTANTS, INC.

~71Ly Russell L. Thomas, Jr., P.E. -"'0' ...., Senior Project Manager fi~1::~ .. · f. J:~~~\ fa? /J _SC: d/'1l7 f· ....·· ~ <; ', ,:7(. 17~~ ,.. . ~ .• ' n A. Focht, III, P.E. ~"·~~h~·P:."F~~·hi"ii'''·~ hief Geotechn ical Engineer ~"':"""""""" " "' : ' '': ''1"'*" 60313 ....$.f

1,?~-,~!.CENS~?';'~"'.:'

"SSIO.. ......"'~".:"',.. NA\. __,,,,,,'0;

/;r.~nd!::::fe~A' Manager, Engi e ring Services chultz, .E.

Senior Vice President

Copies Submitted : Above (4)

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