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What is standard protocol for evaluating whether an existing fire service to a building should be replaced? The building is undergoing a major expansion. The size of the existing line and the pressure/flow in the water main is adequate. The only question is whether the existing on-site fire...

Any recommendations on a good fittings catalog?

Thanks. It seems like they do the same thing. Why would someone prefer one to the other?

What is the difference between the two?

Do all sidewalk routes to the public ROW have to be ADA compliant or do you only need to provide one accessible route? Do all on-site sidewalks need to be ADA compliant?

I thought milling was performed to also provide better binding between existing and new bituminous courses. Do you see any of these overlays peeling up (that is when you don't mill)?

Is it absolutely necessary to mill prior to a bituminous surface course overlay? Are there other reliable methods to ensure long-term viability of the overlay aside from milling?

What about sharp-crested v. broad v. v-notch in detention basins? Any practical experience?

Does anyone know of a reference which discusses the use of weirs in outlet control structures for detention basins? I am looking for a practical explanation of when to use different types of weirs, dos and don'ts, etc.

queque, That is MY question. I am questioning how the State Standards were developed and why they say the model is unreliable. We meet permissible velocities, etc. but our Q25 exceeds 10 cfs and therefore, they have stated that we don't meet off-site stability. I wanted to know if anyone...

Steve, That was the point we made. The Standards, however, indicate that the model is unreliable if Q25 is greater than 10 cfs. Additionally, "level spreaders are not considered to be an acceptable design". I am looking for what "model" predicates the standard that 10 cfs is the maximum Q25.

In NJ Standards for Soil Erosion and Sediment Control, the reliability of the model for demonstrating off-site stability (non-erosive velocities for point discharges) is limited to 10 cfs for the 25-year storm. Does anyone know the basis for this limitation? We have a project where our...

Anyone have an estimate on cost to install 16" DIP in NY/NJ area?

Thanks for info from both. Have either of you dealt with car carriers. My client has informed that they use an 84' long car carrier. They provided a 60.5' wheelbase, but I don't know where they measured from. I figure it has to be a stinger-steered carrier, which I am assuming would have a...

Does anyone know what a WB50, WB60 and WB62 really are? What type of vehicle are they and when are they typically used? And vice-versa, what design vehicle is typical of an automobile carrier, gasoline container truck, delivery truck to big box retail store, etc?

Thanks!

Thanks to bimr and wwtpguru. I believe it clear now. If MJ with restrained joints specified, there is no need for thrust blocks.

Is it common to still use mechanical joint retainer glands underground (fire line)? I saw that US Pipe recommended against retainer glands because of corrosion.

What is the difference between restrained joints and mechanical joint retainer glands? Do both also require the use of concrete thrust blocks?

Does anyone have the dimensions of a typical commercial automobile carrier (6 to 7 vehicles)? I would like overall length and wheelbase. I want to know if it is closer to a WB-50 or WB-62.