HomeMy WebLinkAboutConsiderations for Retaining or Removing the Existing Well Building.pdfHDR Engineering, Inc.
500 108th Avenue Northeast, Suite 1200
Bellevue, Washington 98004-5549
www.hdrinc.com
Telephone (425) 453-1523
(425) 450-6200
Fax (425) 453-7107
Page 1 of 3
Memo
To: J.D. Wilson, Renton Water Utility
From: Greg Pierson Project: Well 5A Treatment Improvements
CC: Milt Larsen, K/J
Date: January 24, 2007 Job No: 51403
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RE: Considerations for Retaining or Removing the Existing Well Building 2
The purpose of this memo is to outline some key considerations to assist with the City’s decision as to 3
whether to remove or retain the existing well building at Well 5A as part of the water treatment improvements 4
project. 5
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Attached are two conceptual site sketches of the well site to help illustrate the points made in this memo. 7
Figure 1 shows a possible site layout with the well building removed. Figure 2 shows a possible building 8
layout that incorporates the existing well within the new treatment building. The size and configuration of the 9
new treatment building is approximate based on preliminary facility sizing requirements and is not intended 10
to represent our recommended configuration at this time, however I believe that the overall footprint size of 11
this building will be fairly close to that shown in the figures. 12
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The key considerations are outlined in the following table and the relative advantages and drawbacks for each 14
are noted in terms of removing the existing building. 15
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HDR Engineering, Inc.
500 108th Avenue Northeast, Suite 1200
Bellevue, Washington 98004-5549
www.hdrinc.com
Telephone (425) 453-1523
(425) 450-6200
Fax (425) 453-7107
Page 2 of 3
Key Consideration Advantages
(existing building removal)
Drawbacks
(existing building removal)
Space for new facilities - Allows for more optimal
location of new facilities
for access
- Easier to meet permitted
setback requirements
from parcel boundaries
and stream
- None
Space for construction of
new facilities
- More space for below-
grade excavations
- More space for laydown
areas and construction
equipment
- None
Aesthetic impacts - One new building has
would have a “cleaner”,
more integrated look with
less visual impact to the
surrounding
neighborhood
- No need to match
architecture of new
building to the existing
building, esp. roof type
- Possible negative
perception for City to
remove the existing
building
Protection of the existing
building during
construction
- Would preclude
protecting the existing
building during
construction
- Will need to protect the
wellhead during building
demolition
Functional / operational
integration with existing
building
- All treatment and
pumping operations
would be in one building
- Existing well head, pump,
and control valves would
be incorporated into new
building
- Precludes potential
design issues for
integrating the existing
building with the new
building, esp. electrical
and controls
- None
Impacts on size of the
new treatment building
- Relatively little increase
in new building size to
include the well pump
and controls and a
lavatory – estimate not
more than about 200 sf
additional needed out a
total of about 5000 sf (~
4% more)
- Costs for demolition of
existing building and the
additional new building
size to accommodate the
well and a lavatory
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HDR Engineering, Inc.
500 108th Avenue Northeast, Suite 1200
Bellevue, Washington 98004-5549
www.hdrinc.com
Telephone (425) 453-1523
(425) 450-6200
Fax (425) 453-7107
Page 3 of 3
Based on these considerations, there appears to be more advantages to the City by removing the existing Well 44
5A building than to retain it as part of the new treatment facilities. 45