WRIGHT-PIERCE =
Engineering a Better Environment REQUEST FOR INFORMATION
WWTF HEADWORKS UPGRADE
7 DATE: February 21, 2016
CITY OF NASHUA, NH aT
No.: WP 07
TO: Reference or affected design
Bruce Kenney — T Buck Construction document(s)
FROM: Spec.
Wright-Pierce Sect.:
DWG.: M-7
Other:
Subject: Modifications to Odor Control System
Description of Request:
Provide a cost to complete the following odor-control related work activities
1. Install the 26-inch FRP bypass duct to terminate 6’-0” above the roof line (current plans
show it terminating at 3’-0” above the roof line). Roof line defined as the top of parapet
wall.
2. Provide Bypass Control Damper Modulation as per the following:
a. The air balancer is to adjust the bypass damper (D-2) position to modulate open to
allow just enough air through to result in an inlet duct pressure just below (-)2”
w.c. to more or less match the pressure drop across the odor control medium.
b. The “full open” damper position is to be established with a spring-return type
damper actuator (a “fail open” type actuator).
c. A lockable stop-clamp is to be bolted to the quadrant, which will prevent the
damper from opening past the stop.
The proposal shall include all labor, materials, etc. to render a fully operable system. The
proposed cost shall be in accordance with Paragraph 17 of the General Conditions. If accepted,
the proposal will be included in a future Change Order.
Additional Info. Attached? Y [_] N [XJ Response needed by: 02/28/16 Signed: KYL
Response to Request:
Additional Info. Attached? Y [_] NL]
Is change to P&S Involved Y LINE] Signed: _. Date:
cc: Bill Keating — City of Nashua
Dan Dudley -NHDES
Portsmouth File
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