B09_Amd8_-_Drawing_00-C3_20_Dec2025_0008.pdf
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- Solicitation number
- 140P2025R0082
About this file
This is a technical drawing sheet for water system details associated with the Deva Water and Wastewater System Rehabilitation project at Death Valley National Park. The drawing, designated as Sheet C3.20 (Detail 00-), was designed by DJ&A with technical review by M. Whelehon and is dated January 17, 2025.
The sheet provides detailed specifications for three primary water infrastructure components: (A) a 2-inch Reduced Pressure Zone (RPZ) backflow preventer installation with a protective enclosure, 4-inch concrete pad, and 18-inch minimum drain depth; (B) a 6-inch and 8-inch RPZ backflow preventer installation with similar protective features; and (C) water tower installation details including two freezeproof potable water towers to be painted blue (FPPW-6) and two freezeproof water towers (FPWT-6). The contractor must specify a 3-foot bury depth when ordering towers, excavate to 1 foot below supply line depth, provide imported compacted embankment in 8-inch maximum lifts, install washed coarse aggregate at 2-foot thickness surrounded by geofabric, and furnish 4 one-half inch by 8-inch galvanized anchor bolts with washers and nuts per manufacturer specifications. All water tower connections require contracting officer approval prior to installation. The tower design includes a built-in backflow preventor and must be installed per manufacturer specifications, with the RPZ backflow preventer model specified as LF880V-FS-OSY or approved equal, and the protective enclosure as Shelter Works Big Mouth or approved equal.
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Text version
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DATE:
DESIGNED:
TECH. REVIEW:
SUB SHEET NO.
PMIS/PKG NO.
DRAWING NO.
SHEET
OF
TITLE OF SHEET
WATER DETAILS 143
178069
174 513
DJ&A
DJ&A
M. WHELEHON
1.17.2025
DEATH VALLEY
NATIONAL PARK
318717 00-
C3.20
NTS
A
C3.20
2" RPZ BACKFLOW PREVENTER
REDUCED PRESSURE ZONE (RPZ)
BACKFLOW PREVENTER
FINISHED GROUND
" M
IN
PROPOSED 2"
WATER SERVICE
INFLOW OUTFLOW
90° BEND (TYP.)
DRAIN (18" DEEP MIN.)
4" CONCRETE PAD
PROTECTIVE ENCLOSURE
AIR GAP
2'
1'
PIPE PENETRATIONS
4" CONCRETE PAD
NTS
B
C3.20
6" & 8" RPZ BACKFLOW PREVENTER
TOWER TO BE INSTALLED AS PER
MANUFACTURER'S SPECIFICATIONS
2 - FREEZEPROOF POTABLE WATER TOWER - TO BE PAINTED BLUE (FPPW-6)
2 - FREEZEPROOF WATER TOWER (FPWT-6)
CONTRACTOR TO SPECIFY 3' BURY DEPTH WHEN ORDERING TOWERS
EXCAVATE TO 1' BELOW
SUPPLY LINE DEPTH
30"±
IMPORTED COMPACTED
EMBANKMENT
PLACED AND COMPACTED
IN 8" LIFTS (MAX.)
WASHED COARSE
AGGREGATE
@ 2' THICKNESS
SURROUNDED
WITH GEOFABRIC
CONTRACTOR TO PROVIDE
NECESSARY CONNECTION AND
FITTINGS FROM SUPPLY LINE STOP
AND WASTE VALVE TO NEW TOWER
ASSEMBLY. CONNECTION TO BE
APPROVED BY CONTRACTING
OFFICER PRIOR TO INSTALLATION.
CONTRACTOR TO FURNISH AND
INSTALL 4 - 12" x 8" GALVANIZED
ANCHOR BOLTS, WASHERS,
AND NUTS PER MANUFACTURERS
SPECIFICATIONS
2'x2'x4" CONCRETE
ENCASEMENT PAD
NTS
C
C3.20
WATER TOWER
REDUCED PRESSURE ZONE (RPZ)
BACKFLOW PREVENTER MODEL
LF880V-FS-OSY OR APPROVED EQUAL
FINISHED
GROUNDGATE
VALVE
SHELTER WORKS BIG MOUTH
ENCLOSURE OR APPROVED EQUAL
CHECK VALVE
GATE VALVE
90 DEGREE BEND
FINISHED
GROUND
GRAVEL FOR
DRAINAGE
6'
3' - 11 34"
WATER TOWER MUST HAVE BUILT-IN BACKFLOW PREVENTOR
NOTES:
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File details come from the government source that posted it. Updated .