Loading...
Freeport NIP(2.8)-CS040508May 8, 2004 Mr. Larry Davis City of Coppell 255 Parkway Blvd. Coppell, TX 75019 '"Hanson Hanson Pipe & Products, Inc.. 1000 MacAr~hur Blvd. Grand Prairie TX 75050 Tel 9?2 263-218~ Fax 9?2-260-3604 www.hanson pipeand products.eom Re: Steel Placement in 6'x8' Vault Extensions Dear Mr. Davis: It has been brought to our attention there are concerns that the City of Coppell has about the steel placement in a 6'x8' vault dser or extension that was produced for a particular project in your area. During our investigation, I noticed that in a particular spot located on the sidewall of the riser that the steel appeared to have shifted dudng the placement of the concrete. Because of this, the chairs or spacers that were used became separated or disassembled from the reinforcing cage which initially caused the problem. As you requested, three (3) cores were taken from separate areas of the riser to determine both the actual steel placement and compressive strength of the structure in question. After reviewing the results our findings were: 1. The concrete cover over the steel represented in the (3) cores is consistent at 2 inches. 2. The average compressive strength of the (3) test specimens is 4,081 lbs/in2. It should be noted that the design concrete strength is 5,000 lbs/in2. Hanson Pipe & Products is committed to providing it's customers with the best quality product possible, while at the same time meeting or exceeding the needs of our customers. In order to help us achieve these goals, Hanson has its own QC/QA program that meets or exceeds state and local requirements. The present instance is an unfortunate example of our inspection program having missed a fabrication problem. In conclusion, we have determined that in order to solve the problem and to keep it from happening again, a different type of spacer or chair will be used in this and similar products. Furthermore, please be assured that all possible measures will be taken in correcting this problem and our intentions are to prevent this from occurring again in the future. Please do not hesitate to contact me at 972-260-3507 with any question that you may have. Sincerely, Ken D. Cambron - QC/QA Manager Hanson Pipe & Products, Inc.