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1751 Harbor Bay Parkway. Suite 200 T 510.748.1900 F 510.748.7800 www.webcor.com
S a n M a t e o S a n F r a n c i s c o A l a m e d a L o s A n g e l e s S a n D i e g o
A n a h e i m
Waterproofing
Field Testing
Commissioning
Below Grade Leak InvestigationObservation at the AXIS San Jose
12-19-2011and 12-20-2011
Observations by Michael Hathhorn
Waterproofing Engineer Webcor Builders
Day one 12/19/2011 consisted of investigating the condition of the garage to determine
locations to be tested. The surfaces of the walls of the garage were skim coated with a
concrete product that appeared to have been applied after previous injections. This top
coat was mechanically removed exposing the Shot-Crete wall. Harvey with Harvey Haynes
and Associates made a determination of the locations acceptability for testing.
Below are pictures of the pre-testing investigations: Note -- effervescence and
mineralization samples being removed from one possible test location.
Day two (12-20-2011) consisted of the final selection of the test areas, eight locations werechosen. Following the determination of test locations core samples were removed. The
diameter and depth of the core samples varied based on the intent of the testing and
rebar locations. Rebar was located using a hand scanner. Cores were removed using a
diamond abrasive tubular bit lubricated with water. After the cores were removed the
voids created were patched by Harvey Haynes and Associates.
Eight test locations
1. B3 - @ Space # 372-3732. B3 - @ Space # 378-3793. B3 - @ Space # 3874. B3 - @ Space # 390-3915. B3 - @ Space # 357-3586. B3 - @ Space # 348-3497. B2 - @ Space # 2828. B2 - @ Space # 226
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Test location #1 -- B3 @ Space # 372-373: Harvey stated that this test location was chosen
to show general condition of previous repairs.
Core sample -- The wet line shows the location of the crack in the test sample. Urethane
grout was present in the crack; the grout was viewed with a 40 power gaugingmicroscope.
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Test location #2 -- B3 @ Space # 378-379: Harvey stated that this test location was chosen
to show the condition of the rebar and to see if rusting had occurred.
View of test area -- Rebar is exposed with no rusting visible.
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Test location #3B3 @ Space # 387 Harvey stated that this test location was chosen to
determine if the crack had been previously repaired.
The outcome of the testing was not known in the field.
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Test location #4 -- B3 @ Space # 390-391: Test purpose not known.
View of the coreOutcome of the testing unknown. Urethane grout injection ports were
visible in the test sample.
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Test location #5B3 @ Space # 357-358: The purpose of the test was not stated.
Water intrusion is shown flowing from rear of test area.
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Test location #6 -- B3 @ Space # 348-349: Harvey stated that this test location was chosen
to show if cracking was shallow (above the rebar) or deep (continuing beyond the rebar).
View of the test sample: Crack is shown the continuing the full depth of the core.
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Test location #7 -- B2 @ Space # 282: Active leak exposed when the coating was removed
at the test area. Harvey stated that this test location was chosen to expose the rebar at
the test area.
Water intrusion is shown flowing from test area.
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Test #8 -- B2 @ Space # 226: Purpose of testing not stated.
Test sample no field conclusion was stated based on the test sample.