HomeMy WebLinkAboutC32210 - CO1 - DW Reservoir Cvr Rplcmnt 861-12Contract C32210
CITY OF PALM DESERT
PUBLIC WORKS
STAFF REPORT
REQUEST: APPROVE CHANGE ORDER NO. 1 TO CONTRACT NO. C32210
WITH LAYFIELD ENVIRONMENTAL SYSTEMS CORPORATION
FOR THE DESERT WILLOW RESERVOIR COVER
REPLACEMENT PROJECT (PROJECT NO. 861-12)
SUBMITTED BY: Mark Greenwood, P.E., Director of Public Works
CONTRACTOR: Layfield Environmental Systems Corporation
2500 Sweetwater Springs Boulevard, #110
Spring Valley, California 91978
DATE: May 9, 2013
CONTENTS: Change Order No. 1
Layfield's Proposed Design Cost Impacts
Contractor Time Extension Request
Letter from Burke Industries (Cover and Liner Manufacturer)
Recommendation
By Minute Motion:
1. Approve Change Order No. 1 to Contract No. C32210 in the total
amount of $149,938.60 for the Desert Willow Reservoir Cover
Replacement Project; .
2. Authorize the transfer of $26,047.80 from contingency to base;
3. Approve a twenty-one (21) calendar day time extension to the contract;
and
4. Authorize the Mayor to execute Change Order No. 1.
Funds for the remaining balance of Change Order No. 1($123,890.80) are available in
Course and Grounds Expenses, Account No. 441-4195-495-8092.
Staff Report
Approve Change Order No
Page 2 of 5
May 9, 2013
Backqround
1 to Contract No. C32210 for Desert Willow Reservoir Project
On February 14, 2013, City Council awarded Contract No. C32210 in the amount of
$260,478.00 to Layfield Environmental Systems Corporation, of Spring Valley,
California, for the Desert Willow Reservoir Cover Replacement Project to replace the
existing floating cover on the non-potable water reservoir and make repairs to other
components of the system including the liner.
On April 1, 2013, the Notice to Proceed was issued to Layfield for this design/build
contract. The contractor has submitted 90 percent progress shop drawings for the
design of the new cover, completed the removal of the existing floating cover, removed
and analyzed the existing appurtenances, cleaned the liner, and removed the
accumulated sediment. The contractor began inspection of the existing liner to locate
holes in the liner in need of patching. However, upon inspection of the liner, the
contractor indicated that the liner was not in salvageable condition. The material
manufacturer visited the site to review the condition of the liner and make a
recommendation to the contractor (see attached). The manufacturer concluded that
patching of the liner would not be feasible and a new liner was recommended. The
contractor also performed an electronic leak location test as part of the contract, but
could not get any meaningful results as expected because the material was so
deteriorated.
Staff requested a formal written recommendation be submitted by the contractor
detailing the proposed replacement of the liner as well as any proposed
additions/deletions to the contract as a result of the design engineer's review of the field
conditions (see attached letter from Layfield).
The following changes to the contract have been requested:
� 1 Proposed Eliminations
� 2 Proposed Additions
� 3 Recommended Replacements
� 4 Design Engineer's Review Recommendations
� Total
-$6,487.00
$5,630.00
$141,574.00 �
$9,221.60 �
$149,938.60 �
Item 1: Proposed Eliminations
Elimination of the cover pathway floats ($1,700.00), inflation ports ($1,300.00), half tube
vents ($200.00), and liner material for patching ($3,287.00) will result in a deductive
change of $6,487.00 to the contract. The contractor has proposed these eliminations
due to advances in the efficiency and design of reservoir covers. Deletion of the above
referenced items will not result in any loss of functionality or ability to maintain the cover
and will actually remove items that could result in high maintenance activities.
\lsrv-fiI2k3\groups\PubWorks�.Staff Reports12013\May 9110 COt C32210 DW Reservoir�SR-COt C32210 DW Reservoir 861-12.doc
Staff Report
Approve Change Order No.
Page 3 of 5
May 9, 2013
1 to Contract No. C32210 for Desert Willow Reservoir Project
Item 2: Proposed Additions
Sixteen inch wide Chlorosulfonated Polyethylene (CSPE) doublers are recommended
along the slopes ($2,050.00). The doubling up of the cover material in these areas is
recommended because these areas are subject to high abrasion and fluctuations in
water levels. This is recommended to strengthen the areas of the cover most prone to
wear and tear. Two existing cover repair floats are salvageable; however, two more are
required (one for each quadrant of the floating cover) for ease of maintenance and
repairs and also to comply with the American Water Works Association (AWWA)
Standards ($900.00). AWWA Standards are minimum requirements for materials,
equipment and practices used in water treatment and supply. The standards are used
worldwide to ensure the highest quality products and service. An outlet vacuum breaker
is required per AWWA Standards ($2,680.00) to prevent damage to the floating cover
as the water level is lowered. The total of these proposed additions is $5,630.00.
Item 3: Recommended Replacements
The existing access hatches are corroded and replacement with new access hatches
suited for the reservoir environment is needed ($3,040.00). Inflation of the cover (to
check for holes) can be accomplished using the access hatches. Foam trough floats
($3,172.00) are required as the floats are not in salvageable condition and will have to
be madified to meet the new AWWA guidelines. New sand tubes ($3,978.00) are
required as the current sand tubes do not meet current guidelines and have lost
approximately half of their material/weight. The existing rainwater pumps are corroded,
seized up and require replacement ($6,600.00). The rainwater pumps remove water
that has accumulated on top of the cover.
A new liner is recommended due to the condition of the existing liner (refer to attached
letter from Burke Industries). The manufacturer has offered new liner material at a
reduced rate in order to assist in remediating this issue. The liner and cover are the
same size (approximately 52,000 square feet each). The cost of the cover included in
the current contract is $194,060. Layfield is proposing $124,784.00 for the new liner as
a result of staff's negotiations and the manufacturer's offer to assist. For further
perspective, this cost is less than any of the original proposals from other contractors.
Due to the long lead time for the liner material, the contractor is requesting a twenty-one
(21) calendar day time extension (see attached Time Extension Request from Layfield).
Patching of the liner (credited in aforementioned Item 1) was included in the original
contract; however, replacement of the entire liner was not included for the following
reasons:
The liner is not subject to UV exposure and was expected to have greater
longevity than the cover.
\\srv-fi12k3\groups�PubWorks�.Staff Reports�2013\May 9\10 COt C32210 DW Reservoir\SR-COt C32210 DW Reservoir 861-12.doc
Staff Report
Approve Change Order No
Page4of5
May 9, 2013
1 to Contract No. C32210 for Desert Willow Reservoir Project
• The floor of the reservoir was covered in silt/sediment on top of the liner and,
therefore, the condition of the liner could not be examined without removing the
silt and/or emptying the reservoir.
• The large tear in the cover made it hazardous to send in a diver to investigate the
liner condition because the cover was not properly restrained and created a
confined space concern.
CSPE is the material best suited for the desert environment, use with non-potable
water, and it has the longest warranty. The warranty on the liner and cover will be a
30-year warranty with the last 15 years of the warranty pro-rated.
The total amount for the above recommended replacement items is $141,574.00.
Item 4: Desiqn Enqineer's Review Recommendations
The following items are recommended by the design engineer to meet current AWWA
requirements: sand tubes along the slope ($3,712.00), rainwater enhancement pipe
($1,200.00), and hatch floats ($3,100.00). Additionally, shorter floats along the slope
are recommended to provide more flexibility for the floating cover as it moves up and
down with the daily fluctuations in water level ($1,209.60). The total for the engineer's
recommendations is $9,221.60.
Staff recommends approval of Change Order No. 1 in the cumulative amount of
$149,938.60, transferring $26,047.80 from contingency to base and approving a twenty-
one (21) calendar day time extension. The remaining balance of funds for Change
Order No. 1($123,890.80) is available in Course and Grounds Expenses, Account No.
441-4195-495-8092.
Coachella Vallev Water District (CVWD)
Per the current Non-potable Water Agreement between the City and CVWD, the City is
required to utilize 80 percent non-potable water for irrigation of both of Desert Willow's
golf courses. Desert Willow currently exceeds this requirement by utilizing
approximately 90 percent non-potable water for irrigation of the golf courses. With the
reservoir under required maintenance, the golf courses will need to be irrigated with well
water at a potentially higher cost. The City has obtained a 30-day waiver from CVWD
to meet this requirement during the required reservoir maintenance and an extension of
this waiver will be requested of CVWD by staff should Change Order No. 1 be
approved.
CVWD provided water and temperature data sheets for the reclaimed water, which were
forwarded to the contractor and manufacturer for review in connection with the liner
failure. Nothing stands out as extremely abnormal.
\\srv-fil2k3\groups\PubWorks�Staff Reports12013UAay 9\10 COt C32210 DW Reservoir�SR-G01 C32210 DW Reservoir 561-12.doc
Staff Report
Approve Change Order No
Page5of5
May 9, 2013
Fiscal Analysis
1 to Contract No. C32210 for Desert Wiliow Reservoir Project
The initial contract amount was $260,478.00. The costs associated with Change Order
No. 1 total $149,938.60 and will increase the contract amount to $410,416.60. As part
of the Fiscal Year 2012/2013 budget, $500,000 has been budgeted for the Desert
Willow Irrigation Pump Renovation project. No appropriation is required; funding is
available in the current budget.
Reduced maintenance costs, prolonged longevity of the new infrastructure, and reduced
water use (through elimination of leaks in liner) are expected as a result of these
proposed improvements.
Prepared By:
�L'
,�.����
Heather Buck, Project Coordinator
Depa m �n Head:
Illu�
(
Mark Gr �en ood, P.E.
Direct � f P blic Works
�
Paul S. Gibson, Director of Finance
al:
M. Wohlmuth, City Manager
, �,..
�/lartin Alvarez J
Director of Economic Development
CtTY COUNCIL AC7TON
APPROVED � DF,NiF,D
RECEIVED OTHER
MFETING DATE ,S �� � �-� ( �
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Contract Purpose Desert Wiliow Reservoir Cover Replacement
Consultant�s Name . Layfield Environmental Systems Corporation
Adaress: 2500 Sweetwater Springs Blvd., #110
Spring Valley, CA 91978
Contract # � P.o. # � C32210 �
Change Order No. I �
Contingency: � YES X � NO
Account No. I
Project No. � 861-12
Vendor No. � 9958
You are hereby requested to comply with the following changes from the contract plans and specifications:
DESCRIPTION OF CHANGES DECREASE INCREASE
(Supplemental Plans, Spec�cations, and Directives dated Attached) In Contract Price In Contract Price
Eliminate cover pathway floats 1,700.00
Eliminate iriflation ports 1,300.00
Eliminate half tube vents 200.00
Eliminate liner material for patching 3,287.00
Add 16" wide Chlorosulfonated Polyethylene (CSPE) Doublers on slopes
Add two cover repair floats
Add outlet vacuum breaker
Add new access hatches
Add foam trough floats
Add new sand tubes (replacements)
Add rair�water pumps
Add new liner
Add new new sand tubes
Add rainwater enhancement pipe
Add hatch floats
Add short floats on slope
TOTALS: 6,487.00
NET CHANGE IN CONTRACT PRICE:
2, 050.00
900.00
2, 680.00
3, 040.00
3,172.00
3, 978.00
6, 600.00
124, 784.00
3, 712.00
1,200.00
3,100.00
1, 209.60
156,425.60
149, 938.60
JUSTIFICATION:
Additional items required by American Water Works Association to meet minimum requirements used in water
treatment and supply, and addition of a new liner that was an unforeseeable item.
TOTAL BUDGET FOR PROJECT:
Less: Expend. & Encumb. To Date:
Less: This Change OrderAmount:
BALANCE OF BUDGET
REMAINING FOR PROJECT:
+
410,416.60 CONTINGENCY:
260,478.00 Amount Approved by Council:
149,93$.60 Less: PriorChange Order(s):
Less: This Change Order.
- Balance Remaining of Contingency:
+ 26, 047.80
- 26, 047.80
The amount of the Contract will be (Decreased) Increased by the Sum of: One Hundred Fortv-nine Thousand
Nine Hundred Thirtv-eiqht and 60/100 Dollars ($149,938.60).
;:\PubWorkslStaff Reports�20131May 9\10 C01 C32210 DW Reservoir\CO 1 DW Reservar Cover-La�eld Environ.doc See reverse
Contract C32210 Change Order No. 1 Continued from front
This Change Order covers changes to the subject contract as described herein. The Contractor shall construct, furnish
equipment and materials, and perform all work as necessary or required to complete the Change Order items for a
lump sum price agreed upon between the Contractor and the City of Palm Desert, otherwise referred to as Owner.
Contract Time Extension 21 Days.
Revised Contract Total $410,416.60
The undersigned Contractor approves the foregoing Change Order # 1 as to the changes, if any, in the contract
price specified for each item including any and all supervision costs and other miscellaneous costs relating to the
change in work, and as to the extension of time allowed, if any, for completion of the entire work on account of said
Change Order # 1. The Contractor agrees to furnish all labor and materials and perform all other necessary work,
inclusive of that directly or indirectly related to the approved time extension, required to complete the Change Order
items. This document will become a supplement of the contract and all provisions will apply hereto. It is understood
that the Change Order shall be effective when approved by the Owner.
Execution of this Change Order by the Contractor constitutes a binding accord and satisfaction that fully satisfies,
waives, and releases the Owner from all claims, demands, costs, and liabilities, in contract, law or equity, arising out of
or related to the subject of the Change Order, whether known or unknown, including but not limited to direct and
indirect costs and/or damages for delay, disruption, acceleration, loss of productivity, and stacking of trades, as well as
any and all consequential damages.
This document will become a supplement to the Contract and all provisions will apply hereto, all items included above
must have required signatures as per the purchase resolution.
REQUESTED BY:
3. CERTIFIED
FUNDS AVAILABLE:
DEPARTMENT HEAD
FINANCE DIRECTOR
NOTE: No payments will be made prior
to City Manager and Council approval
2. ACCEPTED BY:
4. APPROVED BY:
CONTRACTOR Date Accepted
JAN C. HARNIK, MAYOR
CITY MANAGER
Date Approved
Date Approved
G:\PubWorks�,Slaff Reports�2013\May 9\10 C01 C32210 DW Reservo�ilCO 1 DW Reservoir Cover-Layfield ERviren.doc cJ6P, f@V@fS@ ... �
LAYFIELD
ENVIRONMENTAL SYSTEMS CORPORATION
2500 Sweetwater Springs Blvd. Ste. 110
Spring Valley, CA. 91978
Contractor's License # 837614 CA
April 26, 2013
Heather Buck
Project Coordinator
City of Palm Desert
73-510 Fred Waring Dr.
Palm Desert, CA. 92260
Ref: Desert Willow Floating Cover Replacement
Subj: Layfield's Proposed Design Cost Impact
Mrs. Buck,
■ Phone: (619) 562-1200 ■ Web: www.layfieldgroup.com
■ Fax: (619) 562-1150 ■ E-Mail: rhartsock@layfieldgroup.com
■ Toll Free: 1 800 377-8404
In follow up to our onsite meeting held on Wednesday Apri124, 2013, the following table incorporates the recommended
design changes and additions that would bring the floating cover up to cunentAWWA standards. We have also included items
that we recommend replacing due to their current condition and/or failure.
Item
#
I 1
I 2
I 3
4
S
6
7
PROPOSED ELIMINATION
Description Quantity Unit Cost Extended
Cover Pathway Floats 4/ea $425.00 ($i,1t�C�.C)C7)
Inflation Ports 4/ea $325.00 {`,�1,.',�)t).f;i.)) �
Half Tube Vents 8/ea $25.00 (`.'���#�,QfJj �
Liner Material for Patching (Bid Item #5) 200sf $16.44 (� �,�.f�7.�JC�j I
TOTAL �$6,��i.C�O}
PROPOSED ADDITIONS
Description Quantity Unit Cost
16 inch Wide CSPE Doubler 500ft $4.10
*Cover Repair Floats 2/ea $450.00
*Outlet Vacuum Breaker 1/ea $2,680.00
TOTAL
Extended
$2,050.00
$900.00
$2,680.00 I
$5,630.00 �
�
RECOMMENDED REPLACEMENTS
Description I Quantity I Unit Cost I Extended
8 *Access Hatches (New) 2/ea $1,520.00 $3,040.00
STRATEGIC LOCATIONS ACROSS NORTH AMERICA
IFoam Trough Floats (qty assumes 3ft
9 floats on slope) 52/ea
I 10 *6ft Sand Tubes 51/ea
I11 *Cover Pumps (includes cable) 2/ea
� 12 45 mil CSPE Liner N/A
$61.00 $3,172.00 I
$78.00 $3,978.00 �
$3,300.00 $6,600.00 �
N/A $124,784.00 �
TOTAL $141,574.00
ENGINEER'S REVIEW RECOMMENDATIONS
Description Quantity Unit Cost Extended
13 *3ft Sand Tubes 64/ea $58.00 $3,712.00
14 3ft Floats Slope 64/ea $18.90 $1,209.60 �
15 *Rainwater Enhancement Pipe 500ft $2.40 $1,200.00 �
16 *Hatch Floats 2/ea $1,550.00 $3,100.00 �
TOTAL $9,221.60 �
� GRAND TOTAL I $149,938.60 �
(*) Designates items that need to be replaced or added to meet current AWWA standards per the requirement in Addendum
No. l. The standards have been attached for reference to that specific item.
The cost to refurbish existing hatches is $1,003 each, which would result in a$517 savings per hatch or $1,034 total. This
amount could be deducted from the grand total should the City wish to do so. For the cost difference, Layfield would
recommend replacement with new to ensure survivability for the cover life.
If the City chooses to install a new 45 mil CSPE liner Layfield will leave the existing liner in place and install the new
material over the top. Layfield does not see a need to remove the existing material. Leaving the existing liner in place will
not affect the material or installation warranties. Layfield will also repair the damaged PVC pipe grillage over the outlet area
during the liner installation.
Please feel free to contact me if you have any questions.
Best Regards,
LAYFIELD ENVIRONMENTAL SYSTEMS CORPORATION
t
, � %.
,.
. � . ` -�=--�=r: , .
Ross Hartsock
Project Manager
Attachments: (1.) AWWA — Part 2 Floating Cover Design Criteria
(2.) Burke Liner Inspection Letter
STRATEGIC LOCATIONS ACROSS NORTH AMERICA
LAYFIELD
ENVIRONMENTAL SYSTEMS CORPORATION
2500 Sweetwater Springs Blvd. Ste. 110 ■ Phone: (619) 562-1200 ■ Web: www.layfieldgroup.com
Spring Valley, CA. 91978 ■ Fax: (619) 562-1150 ■ E-Mail: rhartsock@layfieldgroup.com
Contractor's License # 837614 CA ■ Toll Free: 1 800 377-8404
Apri129, 2013
Heather Buck
Project Coordinator
City of Palm Desert
73-510 Fred Waring Dr.
Palm Desert, CA. 92260
Ref: Desert Willow Floating Cover Replacement
Subj: Additional Time Request
Mrs. Buck,
We have reached a point in construction where we are unable to proceed further until a decision has been made by the City on
the replacement of the existing liner and other appurtenances. During the site inspection of the liner and appurtenances it was
mentioned that the decision on the replacement items cannot be made until the May 9, 2013 council meeting.
With this considered we are requesting that twenty-one (21) days be added to the schedule. The requested time includes the
fourteen (14) days of downtime between April 29 — May 12, 2013 and an additional seven (7) days to be added if the city
chooses to go with the recommended replacement items listed in our May 26, 2013 cost proposal letter.
Please feel free to contact me if you have any questions.
Best Regards,
LAYFIELD ENVIRONMENTAL SYSTEMS CORPORATION
. ..�.:.�:,„ �' -
Ross Hartsock
Project Manager
Cc: N/A
Attachments: N/A
RH/rh
STRATEGIC LOCATIONS ACROSS NORTH AMERICA
�, ,.
,,�, :__ _ . _
+; ..i ..I � � �--
Apri126�' 2013
Stephen Roades
Ross Hartsock
Estimator/Project Manager
Layfield Environmental Systems
250Q Sweetwater Springs Blvd.
Suite 11 Q
Spring Valley, Ca. 91978
Re; Burke Ins�ection Desert Willow
Ross:
Surke conducted a field inspection of the CSPE liner material on the above referenced
project on April 25`h 2013. The liner appears ta be a 45 mil l Ox10x1000d material and is
roughly 50,000 sq. ft. in size_ Burke understands it has been in service for approximately
17 years and has been covered with a tensioned CSPE floating cover.
Observations;
1) The meznbrane above the water line appears in relatively good condition aside
from some minor mechanical damage.
2) The membrane beiow the water line is swollen almost throughout the entire
surface area.
3) Tkze membrax�e is soft, easily tom by hax�d.
4) There are areas where water vapor blooms to the surface when exposed to
sunIight and heat.
5) There axe axeas of inechanical da�nage, such as tears, holes and scrapes.
6) Many of the "T" joints, areas where one field seamed panel intersects another are
not patched as is usually done to prevent wicking of water into the exposed scrixr�.
Conclusions:
1) Burke has reviewed the canal and water quality spread sheets from the past 2
yeaxs. Aside from a relatively iugh chlorine input nothing stands out as extremely
abnormal. Of course this only speaks to the past 2 years. What transpired previous
to that is anybody's guess.
2) In Burke's opinion there are only three things which could cause this swelling of
tlae membrane. Elevated temperatures of the effluent. Above 164F. High levels of
hydro-carbons in the effluent, or extreme wicking of water into the scrim plane or
2250 5outh Tenth Street • San Jose, California 95112 USA • Tel: ($08) 669-7010 • Fax: (408) 280-0699
a combination of any of the three. We question if sometime over the past 17 years
there could have been an upset in the effluent combined with atx elevated
temperat�u�e event?
Bwrke recommends that a new liner be installed. We do not believe repairs done to the
present material could be successfully done and provide water tight integrity for the life
of the new cover about to be installed.
I have attached pictures taken by Randy Falk of Layfield af the current liner condition.
Burke would be willzng to test the old material once removed to check for hydro-carbon
residue and current tensile properties. In additzon we offer new liner material at a reduced
rate as our way of lending a hand in remed'zating this time sensitive situation.
If you have any questions, please contact this offce at 1-500-669-70I0 x 406.
Regards,
5 /"��
{ rf
Stephen Roades
Vice President Burke Indusiries
Liner, Cover & Roofing Division
2250 S. Tenth Stz'eet
San Jose, CA. 95112
1-408-291-8406 direct
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