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332 Chapter 9 Cross-Connection Control
9.11 Figure 9.31 shows that an air relief valve is piped
directly to a floor drain. Explain the problem and propose a Safety shower
solution.

Water Water Acid
Air vacuum release

Gate valve
Mixing tank

Silent check Figure 9.32 for Problem 9.12

Floor drain adopted a modern plumbing code, such as the National Plumbing
Code, ASA A40.8-1955, or subsequent revisions thereof, provi-
sions of the code will govern backflow and cross-connections. It
then remains to provide an ordinance that will establish a program
of inspection for the elimination of cross-connections and back-
flow connections within the community. A cross-connection
Figure 9.31 for Problem 9.11
control ordinance should have at least three basic parts:
1. Authority for establishment of a program
9.12 Figure 9.32 shows a direct cross-connection of a potable 2. Technical provisions relating to eliminating backflow and
water supply line and an acid solution feed line. Propose your cross-connections
solution for the cross-connection control. 3. Penalty provisions for violations.
9.13 The successful promotion of a cross-connection control and Review the cross-connection control ordinances of at least two
backflow prevention program in a municipality will depend on a U.S. cities and suggest a model program for adoption by your
legal authority to conduct such a program. Where a community has municipality.

BIBLIOGRAPHY
American Water Works Association, Policy on Public Water http://www.water.denver.co.gov/custserve/commercial/
Supply, AWWA Website, 2010. operatingrules/chap11.html, retrieved 2009.
American Water Works Association, Recommended Practice University of Southern California, Prevalence of Cross-
for Backflow Prevention and Cross-Connection Control, Connections in Household Plumbing Systems, February, 3,
Manual of Water Supply Practice Practices M14, Denver, 2004, http://www.usc.edu/dept/fccchr/epa/hhcc.report.pdf,
CO, February 2004. retrieved 2010.
City of Riverside, Water Rule 13, Cross-Connections and U.S. Environmental Protection Agency, Cross-Connection
Pollution of Supplies, Public Utilities Department, Control Manual, EPA 816-R-03-002, Washington, DC,
Riverside, CA, 2003, http://www.riversideca.gov/utilities/ February 2003.
pdf/water-rules/w_rule13.pdf, retrieved 2010.
Denver Water, Operating Rules, Chapter 11-Cross-Connections,
Denver, CO, Last Amendments December 1, 2007,