17 DEC 2003
C-2.7.1 Allow Vendor A, Vendor B and Vendor C units in the specification by elimina-
tion of any non-critical provisions that might make the specification proprietary. Seek
information on more vendors of continuous backwash filters that may be suitable.
C-2.7.2 Install two 5-ft (1.5-m) diameter filters with provisions for bypass back to the
equalization tank ahead of the air stripper, allowing constant flow to the stripper while
filtering at a reduced rate during filter outages. Reminder: Put provisions for scheduling
concurrent down time for stripper and filters in the O&M Manual.
C-2.7.3 Provide a settling tank for the reject stream with approximately 4 hours reten-
tion and a pumping system to return the decanted liquid.
C-2.7.4 Calculate the system head losses, including the media, the filter system inlet
and the exit losses. Size equipment, including blowers and pumps. Design a pump
system with controls to be compatible with the filter system, being careful not to specify
flow and head conditions in excess of the filter system. See Paragraphs C-1.6 through
Complete the Design. The following drawings are required.
C-2.8.1 Write a Design Analysis in compliance with ER 1110-345-700 containing the
Calculations as indicated in this appendix and in Chapter 8.
Computer print out with documentation.
C-2.8.2 Write Specifications in compliance with ER 1110-1-8155 including the follow-
ing United Facilities Guide Specifications (UFGS)