HomeMy WebLinkAboutEngineer's Letter 07.18.2017PATTILLO ASSOCIATES ENGINEERS, INC.
STRUCTURAL CONSULTANTS
1215 grand avenue. post office box 751 glenwood springs. Colorado 81602
phone (970) 945-9695 e-mail: inlo:Olyttengineers.com
July 18, 2017
Art Klein Construction
3370 Chelton Loop South
Colorado Springs, CO 80909
Re: 324 Larkspur Drive Repairs
Garfield County. Colorado - PAE #16028
To Whom It May Concern:
Please be advised that Pattillo Associates Engineers was involved with certain aspects of the structural
repairs that were accomplished for the subject residence in 2016 and 2017. Our scope of work included
consultation pertaining to the methods and extent of foundation underpinning, periodic observation of
compaction grouting operations, design of new, concrete wall "infill" panels above the basement window
heads, and measurement of structure benchmark elevations for future monitoring purposes.
With regard to the compaction grouting underpinning repairs that were done to stabilize the structure
from further settlement, we observed the operations of Hayward Baker on several occasions and
reviewed grouting logs. A total of 204 cubic yards of grout was injected in 59 locations around the
perimeter of the building, at an average depth of 26.5 feet. The work was verified to comply with the
Grouting Plans prepared by J.R. Harris & Company, dated June 17, 2016.
Our office also prepared a design to improve the structural span capacity of the east basement wall by
infilling the area above the two window openings with reinforced concrete. A copy of the drawing dated
September 22, 2016, is attached to this report. We inspected the reinforcing and formwork prior to
concrete placement and hereby confirm that the construction complied with the design.
Lastly,_we conducted an elevation survey on May 11, 2017, to establish the relative elevations of 59
marked points within the house and 8 points in the detached garage. This survey is intended to serve as a
benchmark reference to verify the stability of the buildings in the future. The locations of the points are
shown on the attached "Monitoring Plan" drawing, and the calculated elevations are shown on the
attached "Relative Elevations Summary" chart. The level measurements were made using a calibrated
manometer, considered accurate to plus or minus one-tenth inch. The survey can be repeated by request
at any time in the future to detect any post -stabilization vertical movement that may or may not occur in
the interim period between surveys.
......
Please feel free to contact Ii`f,.►' ate ILl"''•-.: questions or would like further information.
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Robert tillo, P.E. I. ' • 710' 11.*\.
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Sincerely,
enclosures:
East Foundation Window Notch inrll
Monitoring Plan
Relative Elevations Summary. May 2017
email copy: Art Klein (nktein uaCI:c€nssmicIion eon)