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Yes I have thought about this and it does help to some extent, but we'd like to keep the operating range to at least 1.5 feet and this can still cause a problem when using a peak of 4.0.

Does anyone have any information on ideal peak factors to use for sewer pump station design flows. Ten States has a chart for peak factors based on population but this is excessive and seems to be more aclimated to large plant flows. The state regulators here are now requiring a minimum of 4.0...

Well I witnessed the test and, true to form for this limestone, it was not successful. The charges were set at 5 feet deep and there was breakage from 3 to 5 feet but nothing above 3 feet. Their plan is to bring in bigger drilling equipment and try the larger Nonoex charges. I'll try to post...

Actually, we are the utility. We have always used a rule of thumb of 20 feet minimum, but this case is a little different. There is plenty of solid limestone here and the contractor has been beating and pecking the heck out of it for over a month. It has gotten so bad that he was only laying one...

Is anyone aware of any regulations or rules of thumb on how close to existing underground pipelines blasting should be allowed. We have an existing 12" sewer force main which is about 8 feet from where a contractor is preparing to blast for a new 18" trunk sewer. The gravity sewer will be about...

Saxon, Thanks for your reply. Maybe I should explain a little better how our development process is here. A developer will be required to obtain certification from the utility companies in the area that the property in question has water and sewer facilities available before either a...

Thanks RWF7437 We require vac test of all manholes before we accept them. The problems are occurring after sewer lines are installed and earthwork and other construction has started. In some situations we still have a bit of leverage with the developer to go back and fix any problems, but this...

I am looking for a solution to a problem I am having with new manhole construction. The lid frames are being knocked off of the new manholes by grading equipment. This is occuring after we have inspected and approved the new sewer line and manhole construction in many of the new developments...