9.
Dug wells should be Iined with _____________. ____________, or ___________.
10.
Any flow of nonpotable water or other Iiquid into a potable water system is termed
________________.
11.
Backflow caused by negative pressure (partial vacuum) in a water system is
termed _________________.
12.
The operation of a siphon is based upon three physical factors:
a. _______________________________________.
b. _______________________________________.
c. _______________________________________.
13.
Does the illustration below depict a direct or indirect cross connection?
14.
The only positive protection against backsiphonage in a plumbing system is a
____________________________.
15.
The most common cause of indirect cross connection is the _________________.
16.
Vacuum breakers provide protection only against ____________________.
17.
When a vacuum breaker must be used, ___________________ the type is
preferred. This type must be located on the ____________________ side of the
fixture valve.
MD0160
6-36