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You should definitely use restrained joint pipe for the HDD. Another option besides restrained bells in each joint is fusible C900. It's probably not a big deal in Louisiana, but in areas where you might be drilling through cobbly soil, the collars/bells on jointed pipe can increase the...

Do it like they used to do the storm cellars in the mid-west for tornados. A set of concrete stairs going down to the door with a hatch on top to keep rain/snow out.

It could be the number of wires in the duct and its diameter.

I worked for a system that had a lot of PCCP. It was installed in the mid 1960s and started to really have a lot of breaks in the 90s to 2000s. The main cause was determined to be the high chloride content of the soil attacking the concrete and allowing the reinforcing to corrode and fail.

We are working on the contract documents for a small warehouse and plan on using infrared tube heaters. Just wondering if anyone has a good specification that they would be willing to share. Thanks

Yes and yes. Because the first 4-inch base course was already compacted when you placed the 2-inch base course the top 2-inch base might not bind to the bottom base course. That is probably why he wants the bottom ripped and then place the top course. As far as compaction, there is always the...

I would think it would depend a lot on the type of soil and the pressure in the waterline. 12" seems awful close to me.

What is the purpose of the steel pipe. If it is to allow for a tap on the line you could just use a tap saddle compatible with the HDPE pipe.

Because of the difference in the coefficient of expansion between the two materials.

More bodies makes it more likely that someone's insurance company will settle rather than be dragged into court.

Thanks everyone, I appreciate the feedback.

SRE- The trench is 4.5' deep with an 8" pipe being installed. The depth is constant. Swazimatt- We have a bid item for trench stabilization. Doing a lump sum item may be the only way to handle this.

Thanks SRE,SWC and dik for your responses. This project is in southwest Colorado and the groundwater would not be present if not for the irrigation. We will be starting the project at the beginning of irrigation season, so the groundwater will be minor at the beginning of the project and...

So do I set a pumping rate, i.e. 3,000 gph times a dollar amount? Or something else?

Not to late to put it in the design or schedule of values, but how do we set the units so that the contractors can develop a bid value. Don't want to set it as lump-sum or we could spend $1 million. Looking for a way to measure how much groundwater the contractor has to handle and can set a...

The irrigation water is from outside sources, i.e. adjacent farmers irrigating their fields, so the owner has no control over the irrigation water. Unfortunately, we can't ask the farmers to not irrigate.

We have a pipeline that will be constructed that has an area that has potential groundwater that is primarily driven by irrigation in the area. It is difficult to determine how much groundwater there will be at any given time or point. We will be bidding the project in the next month and one of...

It sounds like someone should have contacted the City about the easement prior to designing something that only allowed 9.5 ft of vertical clearance above the easement. For replacement in the future, sliplining could be considered, as long as the existing RCP doesn't have major deflections in...

What kind of resources are you looking for?

When I was working as a plumber in the late 70s early 80s in the Denver area, there were some builders that would place cardboard support forms under the slabs where there was highly expansive soils. My understanding at the time was the cardboard would prevent the expansion of the soil from...