detrimental quantities of organic matter nor soft, friable, thin, or
elongated particles in accordance with the quality requirements in ASTM C 33,
Table 1 and Table 3, Class 5S, and in ASTM E 11, Table 1. The filter pack
shall meet the following gradation requirements:
ASTM E 11
PERCENT BY WEIGHT
SIEVE SIZE (SI)
PASSING
[_____]
[_____]
[_____]
[_____]
U.S. STANDARD
PERCENT BY WEIGHT
SIEVE NO.
PASSING
[_____]
[_____]
[_____]
[_____]
2.4
OUTLET FOR RELIEF WELL
**************************************************************************
NOTE: Insert provisions describing the materials
and construction of a well pit, collector pipe, or
ditch or any other proposed outlet for the relief
well. Discharge details should be clearly shown on
the drawings.
**************************************************************************
2.4.1
Check Valve
**************************************************************************
NOTE: The following requirements are for two
different check valves that have been specified by
the Vicksburg District. Details of the fabricated
check valves are available upon request from
CELMK-ED-G, telephone (601) 631-5208 or (601)
631-5633 . The soft sponge rubber should be used on
valves which can be replaced on a regular basis and
used under low head conditions. The medium sponge
rubber should be used where access to the check
valve is limited.
**************************************************************************
[The check valve shall be a one piece reinforced all rubber (neoprene)
check valve with an integral elastomer flange similar and equal to the Red
Valve Series [35][_____], Size [150][_____] mm [6][_____] inch,
manufactured by Red Valve Company, Inc., 700 North Bell Ave., Pittsburgh,
PA 15106, telephone (412) 279-0044. The check valve shall be designed to
withstand a maximum back pressure of [100][_____] kPa [15][_____] psi. The
backup ring for the check valve shall be stainless steel. Stainless steel
bolts, washers, and nuts shall be used to fasten the valves onto the
flanged end of the pipes. The check valve shall be installed with the
flared end duck bill in a vertical position.]
[Fabricate check valves of [brass][stainless steel][aluminum] plate,
threaded fasteners and rods as detailed on the drawings. Fabricate sealing
disc of [10][_____] mm [3/8][_____] inch silicone sponge rubber free of
porous areas, foreign materials, and visible defects.]
SECTION 02525A
Page 15
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