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HI: I have been involved in several aeration system upgrades over the past few years. We always consult manufacturer's of the Diffusers and grids and manufacturer's of the blowers. Together the two parts make up the aeration system for many wastewater treatment processes. The Diffuser Mfg's...

I know that this is a little late based on the date of your post, but, you might find this interesting. I work with an extended air plant and we recently changed out the blowers and changed to fine bubble diffusers. The plant operates at approximately 40 to 45% of capacity (based on flow) and...

I can't say that I am jumping on the HDD gravity sewer band wagon. I believe that there needs to be a broader conversation that results in a guidance document to help contractors understand issues that engineers are concerned about and provides the benefit of others experience to those who may...

rconner: Thanks for your link. I have seen the past threads and they focus on how likely (or mostly unlikely) it is that HDD can meet the typical requirements of the standards for gravity sewer. I have several HDD contractors insisting that the Standards were developed at a time when the only...

It would seem that, something you are going to spend so much time and effort on, should develop out of your own experiences and interests. You might be able to get better advice and suggestions if you shared a little more about your experience and interest. What have you been doing with your...

Hi: I've actual had a DOT engineer ask me to supply a 1/2" riser for use in a repaving project on some sanitary manholes. I had to explain that they were not available in this thickness. But after the paving was completed, they said that because we wouldn't provide risers, they were ordering...

Hi: I'm just curious to hear from people about their experience with applying 10-States or TR-16 Standards to installation of sewer pipes using HDD(horizontal directional drilling). 10-States requires consistent line and grade between manholes. Most HDD work would have trouble meeting that...

Hi: There have been a lot of manufacturers offering "package" water treatment units. The one that I am most familiar with is Trident. I was wondering if anyone has seen or knows of an operators forum for package plants in general. It seems like sharing experiences could be useful for...

Thanks for your input. I'll check into both suggestions.

Hi: I was wondering if anyone has found a good refresher course for the design of earth retaining structures. The current building codes in our area require engineered design of retaining walls exceeding 3 ft in height. Yeah, I can buy software that does the design, but, I won't do that until...

You might try to advance a casing when digging the boring. I have used this technique when checking the depth of ASTM C-33 sand used for wastewater disposal fields. in that situation, I used a 6" double-wall HDPE pipe available from a home supply store. For washed stone, a heavier wall PVC...

Thanks Bimr: Yes, I understand the points you are making and they are valid considerations. But, there are obvious errors in the data being reported. I have not shared the name of the manufacturer because I do not want to drag them through the mud. I am trying to understand what experiences...

Thanks Artisi: The typical way to refer to a pump station with two pumps is a duplex pump station. I prefer the to think of them as a simplex pump station with 100% reserve pumping capacity. One pump can handle all of the flow. The pumps alternate from pump 1 to 2 after each pump down cycle...

Thanks Steve: The unit that I have installed is also monitoring a duplex pump station using float controls with constant speed pumps. I have notice some significant anomalies in the flow rate and starts. The station has been typically having about 100 starts per day (50 per pump). There seems...

Hi: I was wondering what peoples experiences have been with the new class of Alarm and Pump performance monitors. Several manufacturers are making these such as Mission Communications and Raco. I am wondering if the pump performance data such as gpm, starts and run time being provided is...

Hi: A client of mine obtained a copy of the original sewer plan for his collection facility. It was prepared in 1904. There is a list of data at each sewer main. I am trying to understand what many of them mean. I was wondering if you might be able to help. I attached a shot of a portion...

Thanks for all of your responses. They have given me a lot to think about. I will review the reference that CANEIT provided. It looks like there is a lot of useful information in the publication. It doesn't seem as if there is a lot of engineers out there that are providing engineered...

Thanks Dick: I have had many of the same thoughts as you. I've thinking that this problem is kind of like the bumble bee. Scientist and engineers think that the bee shouldn't be able to fly, but, there is plenty of evidence out there that shows it does. Dry-stack walls are out there and have...

Hi: I am working on a project that involved a significant amount of blasting. The owner wants to use this stone for some retaining walls around the new construction. several of these wall will be over 4' and as much as 8'. The wall will be constructed as a dry laid/stacked stone. The...

Hi: In reviewing this discussion, I was reminded of a study performed by the ACOE Cold Regions Group. The study looked at wheter insulation could be used to "delay" freezing for a long enough period to allow shallow cover of water mains. You can look at the study at this link...