From: Paul Schultz
Sent: Friday, June 12, 2009 9:36 AM
To: Dave Gurwell; Paul Bobek
Subject: FW: Electrical Service at City High newest addition
Gentlemen,
Repairs have been made to the conduits that have occasionally leaked into the electrical room at City High. If repairs are successful, we can close this issue.
Thanks,
Paul
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From: George F. Kanz [mailto:gkanz@shive-hattery.com]
Sent: Thursday, June 11, 2009 10:38 AM
To: Paul Schultz
Cc: Mitchell T. Kelchen; Tandi S. Dausener; Jake J. Henkle
Subject: Electrical Service at City High newest addition
Paul Price Industrial excavated the four pvc conduits that contain the electrical service to the newest addition to City High School on July 9. Paul Hada and Carl did the actual work. After some rainfall events, water has entered the electrical room in the conduits (4).
The four conduits were exposed. Observations include:
1. The soil in the trench appears dry sand and clay mixture. The material at the building wall however was a bit more moist but standing water was not observed.
2. The conduits are undamaged and joints tight where exposed.
3. The conduits are sloped away from the building for at least 15 feet.
4. The conduits go from a vertical stack to a horizontal stack within 20 feet from the building.
The Contractor reported two of the conduits had visible water in them when a hole was drilled in each of the conduits. At the first location nearest the building where the conduits are horizontally stacked, the contractor reported drilling holes in the conduit for water to drain and installed a one foot deep trench below the conduits. A trench was dug sloping towards the retaining wall . The conduits were wrapped in filter fabric. The trench was connected to the rock backfill behind the retaining wall. The trench was filled with clean 3/4 in limestone.
The idea is to drain the conduits into the "French Drain" and allow the water to drain to the retaining wall drainage system. The "French Drain" is at about 30 inches of depth and will be able to drain even in most frost situations.
Also the connections at the building between the PVC and Steel conduit were smeared with roofing cement and then the entire trench filled with premixed concrete.
The completed improvements have not been tested by major rainfall events. The electrical equipment room will be monitored after rainfall events and the temporary measures to intercept incoming water will remain in place.
Please advise of questions and comments. Photos were taken and will be forthcoming.I really appreciate the assistance given by your staff electrician Jeff and his helper.
George F. Kanz, PE, RRC, LEED AP
Building Systems Team Leader
p. 319.364.0227
c. 319.560.6011
www.shive-hattery.com
Note: This page was published May 9, 2011. Blogger's template engine doesn't allow specific posts to be excluded from view. Since this is part of a much bigger post on this issue, we set the date back to prevent it from clobbering the front page of the site.
