Is the curb box placed in the ground over the corporation stop? (plumbing question)

[sevensages]

TL;DR Summary

Is the curb box placed in the ground over the corporation stop?

I recently completed an online Plumbing Program with Stratford Career Institute. In volume 3 of my Plumbing textbook on pages 298 and 299, the author asserts the following: "A curb box is a cylindrical casting placed in the ground over the corporation stop." But in the diagram on page 298 of the Plumbing textbook, the curb box is placed in the ground above the curb stop valve, not the corporation stop. In the diagram on page 298, the corporation stop is placed far to the left of the curb box. Here is a photograph of the diagram on page 298.

PhysicsForums always rotates my photographs, but you can still see that the Curb box is not directly over the corporation stop in the diagram.

The text of my textbook says that the curb box is placed over the corporation stop, but that is not what the diagram shows on page 298.
The text of my textbook contradicts the diagram on page 298. Which is correct? Is the text of my textbook correct? Or is the diagram on page 298 correct? Is the curb box placed in the ground over the corporation stop?

 

[Lnewqban]

The diagram is correct, the text is not.

 

[sevensages]

The diagram is correct, the text is not.

That's what I suspected. Thank you.

 

[berkeman]

PhysicsForums always rotates my photographs,

I'll send you a DM to try to figure this out.

 

[Lnewqban]

In the case of new multiple dwelling buildings, like yours, there is one tap and one main curb valve that serves all the units.
Then it branches out to the meter register of each unit.

That "cylindrical casting placed in the ground over the corporation or Utilities Department's curb stop valve" serves only for reaching down with a tool to open or close that valve.

After a new supply pipe is tapped onto the main, the connection and the curb stop valve get buried because those do not need service and maintenance, unlike the shutoff valve, the meter, and the check valve (which is required by most current codes for avoiding any contamination of water in the main due to accidental back-flow from the house).