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I typically use 5 ft/s as an opening ballpark for my flow and friction loss calculations. I do allow up to 10 ft/s but this is rare. For reference I'm typically working on 1/2" to 6" pipe sizes.

We are just looking to buy a couple new ones, and I'm trying to find which versions other companies have liked working with. I'm just wondering if anyone here has used another type, and what they think of it.

My first thought is keep the oxygen up (i.e. air or bio-sparging), and something for a food source, and natural bacteria should have a heyday. I'll think a little more on it though, and maybe someone that has worked with it will have some more ideas. What is the depth to the groundwater...

Based on what you mentioned so far, it sounds like the limiting factor is your pump. Although the location of your spigot, is it at the tank, at the well, or on the other side of the house could affect that. The quick glimpse I had of the website you attached looks like a good place to start...

Quick answer probably, it really depends on the requirements of your local state. 3700 ppm sounds high, but it isn't 3700ppm of gas it is 3700 ppm of something. The somethings are the key, some regulatory limits can be 1 ppb and even lower, where others 3700 could be acceptable, especially...

We are required by the state to use FID's (not PID's) as part of our soil screening process during soil sampling activities. We currently use the Foxboro Century OVA. Does anyone have a recommendation for other FID's they have had good success with?

You might consider working for a consulting firm that does structural/geotechnical and environmental work. You may be able to find one that will allow you to work in both areas. I can't speak for working in structural, but in my experience in environmental consulting, it is long drawn out...

Does anyone know some good reference sources for comparing Air Sparging and Biosparging? I have been asked to look for documentation or recommendations comparing the different ranges for airflow rates for each method. (i.e. air sparge is typically 4-12 scfm and biosparge is typically 0-4 scfm)...

Several of the items PEInc mentioned are the reasons I am not comfortable excavating this site. It is a relatively narrow area, maybe 50 feet from a Federal Highway to the business. I have also been burned twice in the past year with sheet piling causing or at least contributing to damage to...

Are there any tests or guidance documents to determine if a sand is a flowing sand? I am being pressured to perform a soil excavation as part of a remediation project, but my geologist strongly believes the sands become flowing sands once we get below the groundwater table. I would like a way...