HomeMy WebLinkAboutR03-Public Works
CIO OF SAN BERNARDOO
-- /
File No. 6.251-9 - / -
- REQUOT FOR COUNCIL AcQON
From:
Qt:
Roger G. Hardgrave
Public Works/Engineering
Subject:
Approval of Change Order No. Four --
Contract with San-Val Engineering for
HVAC for New Central Library per Plan
No. 6463
Date: April 26, 1985
Synopsis of Previous Council action:
5-21-84 --- Resolution No. 84-187 adopted, awarding a contract for HVAC to
San-Val Engineering, Inc., for the low bid price of $369,128,
comprised of the Base Bid, plus additive alternates No.'s 1 and 3.
4-15-85 --- Change Order No. Two approved changing the ceiling diffusers and
relocating air intakes in the atrium, at an increase to the contract
cost of $1,639.02, from $369,128.00 to $370,767.02.
Recommended motion:
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That Change Order No. Four to the contract with San-Val
Engineering, for the construction of HVAC for the New Central
Library, in accordance with Plan No. 6463, be approved, to
authorize the Contractor to furnish and install an automatic
three-way tempering valve on the geothermal return line, and
relocating a thermostat at an increase in contract price of
$1,348.78, from $370,767.02 to $372,115.80.
cc:
John Hatzer, Jr., City Administrator
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Contact person:
Roger G. Hardgrave
Phone:
5025
1
Supporting data attached:
Ward:
FUNDING REQUIREMENTS:
Amount: $1,348.78
Source: Bonds sold by RDA and Grant
through State Libraries
Finance:
Oncil Notes:
75-0262
u~?<-- .s;h3//<)
Agenda Item No. ~,,: &
CIT..cbF SAN BERNARDINO - REQUES() FOR COUNCIL ACTIGI
STAFF REPORT
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Change Order No. Four will authorize the contractor to furnish and
install an automatic three-way tempering valve on the geothermal return
line. Mr. Kevin Fisher, Geothermal Resource Engineer for the Water Depart-
ment, has suggested that this valve be installed to reduce our operating
cost. A copy of the letter from Mr. Fisher, dated 11-7-84, is attached for
reference.
A copy of the memorandum from Don Rogers, Construction Manager, dated
April 24, 1985, is attached. In this memorandum, Mr. Rogers describes each
item of work, and recommends that Change Order No. Four be approved.
We concur with the recommendation by Mr. Rogers that this change
order be approved.
The Budget vs. Bid Analysis, dated 12-6-84, included an amount of
$5,000.00 for estimated future cost of change orders, to the contract for
HVAC. Approval of Change Order No. Four will bring the total amount for
change orders up to $2,987.80, which will not invalidate the financial
report prepared in December, 1984.
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75-0264
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MEMORANDUM
DATE: April 24, 1985
TO:
Roger Hardgrave
City of San Bernardino
Don Rogers
San Bernardino Central Library
Bid Package 1t9, HVAC
Change Order 1t4
FROM:
SUBJECT:
Subject, signed change order is attached. The reasons for the changes are:
Bulletin 1t6 is to furnish and install automatic three-way tempering
valve on geothermal return line per bulletin dated 12/13/84. For your
reference we have attached the following:
1. San-Val quote dated 311185.
2.
Bulletin 1t6 dated 12/13/84.
3. Water Department letter dated 1117/84.
This change was recommended by the Water Department. It will conserve
energy in that if the return geothermal water temperature is high enough
it will be recirculated through the building.
Bulletin 1t7 is to relocate thermostat 1t43 as per bulletin dated 1/7/85.
This is being relocated because walls were deleted in BPlt13, Interior,
cost reductions.
We recommend that this change order be approved. If you need any
further information and lor backup, please contact us.
DR Iph
Attachment
cc: Steve Whitney
Oscar Arnoni
Ole Hamblen
Ledge
File
eM 108
i
J.D. Pl,.FFENBAUCH. I~, .
237Uhlcago ~venue
Riverside. California 925
(714)825' un (p ~ <f-.J~..l.<'
CONSTRUCTION MANA.CERS
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CHANGE OROfR (COO.)
Contrect CMng. Ord.r No. Four (4)
Contr.ctor San-Val Enqineerlnq
D.t. 3-111- 85
San Bernardino Central Library
Contr.ct BPU. HVAC. Proi.1I6463
Except .. modified. an ftrm. and condition. of the contr.ct ram.in uncheng.d. ~ d.scription of tha modification .uthor.
ind by this Ch.ng. Ord... to the .bov. proj...t folio...:
'BULLETIN 16 Furnish and install automatic three-way
tempering valve on geothermal return line
per bulletin dated 12/13/84.
ADO
$1,348.78
BULLETIN 17 Relocate thermostate 1143 as per bulletin
dated 1/7/85.
Electrical wiring by electrical
contractor. Not part of B.P. 09
TOTAL
N.C. (by
San-Val)
$1.3U.71
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INCREASE/DECREASE SCHEDULE TIMElY -0- DAYS
FOR THE ABOVE WORK (DEDUCT) 0 (ADDI Qg T~ SUM OF $ 1.3118.78 ·
....__pted by
ConiTactor
Recommend.d
the Architect
R...om....nd.d by
Construction M.n.ger
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Approved by
Owner
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/rcZJ;-(., ;4.1;./;8.)} CI J I .
C {/.:..J/P4
Title ..
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....
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The cumulativa tot.1 of C.O:., including this on., i.
2 'ft, over original coiItract prica.'
....
. .. . --
CONTRACT NO. auDOI'T UNIT NO. aU..O_JICT NO. PUNO NO. ..to. NO. A..OUNT 0' CONTRA.CT l
64-63 --------- ------- ------- 83-2 $363,460 ,
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~REA INVOLVED:
IlFI NO.
JOB C.O. NO.
RFQ NO.
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C. . V CITY HALL (
.: . JOe) N. "D" $TREEl "40' . p, 0, lOX 710 ,)....,
SAN BERNARDINO, CALIFORNIA
(7141 383-5141
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November 7, 1984
Hr. Sylvester Hollins, P.E.
Hollins Corporation
740 E. Colorado Boulevard
Pasadena, CA 91101
Dear Hr. Hollins:
Per our telephone conversation on November I, 1984 and after a review
of the Central City Library plans, I have a suggestion that would make
your design less expensive to operate while in the geothermal mode. Please
feel free to correct or discuss the following enhancement of your design.
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As it stands now, your system shows geothermal wster
being circulated through the building only one time.
My suggestion is to allow the geothermal water to loop
back into the system if a total strip has not occurred.
This may be achieved by several methods; however, I
feel that the following method is the most cost effec-
tive.
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This method uses a 3-vay tempering valve as shown below..
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Existing --\
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I Auto
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Auto 3-Way Tempering Valve
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Geo Return
Geo Service
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3-Way !\)'-Pass Valve
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If a full strip is not occurring, the 3-way tempering valve will direct
a portion of the geothermal water back through the system for a second strip.
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Hr. Sylvester Bo1lins, P.E.
November 7, 1984
Page Two
This process would continue until a heat demand in the building ~ccurred.
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A review of your plans shows an auto 3-way by-pass valve, Sheet K-9.
If this,valve is for tempering the geothermal water, I feel that if it were
installed on the geothermal return, it would be more effective.
Please be adv1seJ;~r.a{'~h1E:...1s only a suggestion and any change orders
incurred by this suggestion.Wlll 'be under your jurisdiction only. I would
like to discuss this with you in detail at your convenience. Please feel free
to contact me at (714) 383-5292 or 383-5001.
Very truly yours,
J?':(.:L
Kevin Fisher
Geothermal Resource Engineer
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cc: B. Wessel
J. Stejskal
B. Kersey
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