Engineering Design Manual - Loudoun Water

Chapter 7: Community Water Systems
reflectors. In cases where the treatment plan and/or pumping facility are fenced, the gate
shall be a fenced gate with pad lock per Loudoun Water standard with a shank size of ¼-
inch in diameter. Where the treatment plant and/or pumping facility is not fenced, the
gate shall be constructed in accordance with Loudoun Water’s standards.
L. Building Layout
To 12 VAC 5-590-720 add the following:
N. Provide suitable architectural treatment. Brick/block shall be provided. Provide
quality interior block filler and paint. Split-faced CMU with foam insulation may also be
used. Slope roofs and provide aluminum gutters with leaf guards and downspouts. Use
standing seam metal roof with Kynar finish for high visibility areas. Soffit and fascia shall
be of low maintenance vinyl materials. Provide insulated, moisture-resistant, painted
drywall finish on interior walls and ceilings in laboratory office and hypochlorite storage
areas in accordance with Loudoun County code for residential occupancy.
O. Loudoun Water owns and operates a communal systems regional laboratory.
Therefore, the minimum laboratory space may be waived by Loudoun Water during the
“Basis of Design.”
P. Floor slabs within all building shall be steel reinforced and shall be sloped 1/8-inch per
foot to a floor drain. Floor to have power-trowel finish and waterproofing sealer applied.
Provide Dri-deck in potential spill areas. Provide industrial grade vinyl tile, or equal, for
office and laboratory areas. Floor drains shall be provided in laboratory and lavatory.
Well blow-off line and floor drain shall have separate discharge piping to grade (if
possible) with a screened or capped discharge end.
Q. Provide minimum 3 feet separation between all equipment and walls or other
equipment.
R. Provide standard Loudoun Water building inventory to include maintenance
equipment, safety equipment and suitable shelving, desk and chair for operators, as well
as file cabinet for on-site record storage.
S. Provide lightning arrestor/protection for each well house and treatment plant.
T. Provide running time meters for all pumps.
U. Doors shall have a closer and wall mounted hook doorstop, and replaceable cores with
keys matched to Loudoun Water standard.
V. Intake and exhaust louvers shall have stainless steel insect screens. Provide gravity
dampers with PVC seal strips.
W. Electrical equipment shall meet the following Loudoun Water standards:
Breakers are to be made by Square D or Cutler-Hammer.
Provide automatic reset and startup for all electrical relays.
Engineering Design Manual
September 2010 98