HomeMy WebLinkAbout1997-08-20 WSB AGENDA1.
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AGENDA
ENGLEWOOD WATER AND SEWER BOARD
WEDNESDAY, AUGUST 20, 1997
5:00 p.m.
** CONFERENCE ROOM A **
MINUTES OF THE JULY 8, 1997 WATER & SEWER
BOARD. (ATT. 1)
GUEST: GREG DYE OF CAMP DRESSER & McKEE
RE: THIRD AMENDMENT TO AGREEMENT AND
ALLEN PLANT PROJECT UPDATE. (ATT. 2)
"NO COMMENT" POLICY ON McLELLAN RESERVOIR
PROPERTY.
VALLEY SANITATION DISTRICT -BOARD AND ATTORNEY
WILL APPEAR AT NEXT MEETING.
OTHER.
WATER & SEWER BOARD
MINUTES
July 8, 1997
The meeting was called to order at 5 :06 p.m.
Chairperson Neumann declared that a quorum was present .
Members present:
Members absent :
Also present :
Clark, Habenicht , Guy, Neumann,
Otis, Wiggins
Burns, Higday, Vobejda
Stewart Fonda, Director of Utilities
1. MINUTES OF THE JUNE 10 , 1997 MEETING.
The Englewood Water and Sewer Board Minutes from the June 10 , 1997 meeting were
approved as written .
Ms . Habenicht moved :
Mr. Guy seconded :
Ayes :
Nays :
Members Absent :
Motion carried.
To approve the June 10 , 1997 Englewood Water and Sewer
Board Minutes as written.
Clark, Neumann, Otis, Wiggins
None
Burns, Higday, Vobejda
2 . LETTER FROM VALLEY SANITATION DISTRICT REGARDING
DISSOLUTION DATED JUNE 16 , 1997 .
The Board received a letter from Valley Sanitation District regarding the dissolution of
Valley Water District and Valley Sanitation District . The Water and Sewer Broad invites
the Valley Sanitation District 's representative(s) to the next meeting to further discuss this
issue .
3. LETTER TO LYNN HALL AT 3385 S. MARION ST.
Mr. Fonda informed the Water and Sewer Board members that Ms . Hall had a special
medical problem that required the use of distilled water. Due to Ms . Hall's needs, distilled
water was being made available to her at the Allen Filter Plant or at the Bi-City
Wastewater Plant.
Mr. Fonda indicated that special requests should continue to be considered on an
individual basis .
4. PROPOSED ORDINANCE: PROBHIBITED DISCHARGES .
The board received a copy of a memorandum regarding an addition to the Municipal Code
concerning Storm Water at the June 10th, meeting . Ms. Neumann noted that the
correction needed in paragraph ( a ) had been corrected in both the Memorandum and the
attached City Ordinance .
Mr. Guy moved :
Mr. Otis seconded :
Ayes :
Nays :
Members Absent :
Motion carried .
To recommend Council approval of the addition to the
Storm Water ordinance : Section 12-15-9 PROHIBITED
DISCHARGES .
Clark, Habenicht, Neumann , Wiggins
None
Bums, Higday , Vobejda
4. LETTER TO MR . RICK CABLES, FOREST SUPERVISOR REGARDING
SUPPORT FOR THE ALTERNATIVE A2.
The Board approved to support the Wild and Scenic River Study Report and Draft
Legislative Environmental Impact Statement for the North Fork of the South Platte and
the South Platte Rivers as outlined in the Draft LEIS .
Ms . Neumann moved :
Mr. Wiggins seconded : To support Alternative A2 .
Ayes : Clark, Guy , Habenicht , Otis , Wiggins
Nays : None
Members Absent: Burns, Higday, Vobejda
Motion carried.
5. A SPECIAL REQUEST WAS MADE BY MS . HABENICHT.
The Water and Sewer Board Members, Mr. Fonda, and Ms. Miller wish to state:
we are thinking about Ms. Cathy Burrage and that we wish her a speedy recovery.
The next Water and Sewer Board meeting will be August 20 , 1997, at 5:00 p .m. in
Conference Room A.
Respectfully submitted,
Cathy Miller
Acting Recording Secretary
AUG 08 '97 08:53AM CAMP DRESSER & MC KEE
TIIIRD AMENDMENT TO AGREEMENT
This THIRD AMENDMENT made this ____ day of ____ , 1997 between the City of
Englewood, Colorado ("OWNER") and Camp Dresser & McKee Inc. ("ENGINEER") modifies the
AGREEMENT between the OWNER and the ENGINEER dated May 6, 1996.
The AGREEMENT is modified by this TillRD AMENDMENT to (1) provide modifications to the final
design of improvements to the Allen WTP; (2) Bidding Phase Services ; and (3) Construction Phase
Services. Specifically, the following modifications to Exhibit A to the AGREEMENT are agreed to:
1. Add the following paragraphs to Exhibit A:
"1 .5 Additional Design Investigations and Final Design:
1) Investigate and report on filter pipe gallery flooding during backwash
2) Design additional raw water piping, metering, overflow and discharge structures
for the North and South Reservoirs and redesign of City Ditch turnout structure
3) Potassium Permanganate feed modifications -relocate plant feed room and
modify existing pump station for second feed facility
4) Relocate blower facility to a separate building
5) Prepare an Environmental Assessment for CW &PA Loan Application
6) Prepare predesign and design of site flood proofing and drainage
7) Perform an inspection of the filtered water channel: prepare a report, and design
repairs
8) Incorporate the ClearweU Modification Project into the Project, and provide
assistance with GAC Filter Media Service Contract and in obtaining NPDES
Discharge Permits
9) Evaluate a new round of proposals from lamella plate pack suppliers
10) Revise design of Pretreatment Facility to accommodate Waterlink Supersettler
plate system
11) Perform a design investigation and prepare specifications for (a) repairs to the
holes and nicks in the Exterior Insulation Finish System (EJFS), (b) re-coating of
the entire EIFS , and (c) refinishing of doors and windows
1.6 The Bidding Phase Services described in paragraph 2.3. of the AGREEMENT are hereby
authorized. The net cost for printing of the contract documents issued during the
Bidding Phase will be paid for by the OWNER. Net cost is defined as the actuai cost of
printing as arranged for by the ENGINEER Jess the net value of the document deposit
AUG 08 '97 08:54AM CAMP DRESSER & MCK EE
received and held by the ENGlNEER from prospective bidders after all refunds have
been issued.
1. 7 The Construction Phase Services described in paragraph 2.4 of the AGREEMENT are
hereby authorized."
2. The schedule for performance ofENGINEER's services in the TIIlRD AMENDMENT is as
follows:
1.5 Additional Design Investigations and
Final Design
Commence Work Complete Work
Work underway October 31, 1997
October l, 1997 December 31, 1997 1.6
1.7
Bidding Phase Services
Construction Phase Services November 1, 1997 May 1, 1999
(substantial completion)
August 31, 1999
(final completion)
3. Payment of Services rendered by ENGINEER. The following are budget costs for services
authorized by this TIIlRD AMENDMENT:
1.5
l.6
1.7
Additional Design Investigations and Final Design
I) Filter pipe gallery flooding
2)
3)
4)
5)
6)
7)
8)
9)
IO)
Additional raw water facilities
Additional Potassium Pennanganate facilities
Separate Blower Building
Environmental Assessment
Site Floodproofing, drainage -preliminary design
-design
Filtered Water Channel -inspection and report
-design
Clearwell Modifications -design
GAC Filter Service Contracts and NPDES Discharge
Pennits -assistance
Lamella plate pack supplier negotiations
Revised design to accommodate Waterlink
11) Design, specifications for repair/refinish of Exterior
Insulation Finish System
Subtotal, Additional Design
Bidding Phase Services
Construction Phase Services
Total
07ll1\l0!141147DNMGT\AMENDJ 8fti'!'I JW
$ 10,880
18,000
0
59,000
5,300
18 ,460
57,500
8,300
9,200
3,400
6,500
8,500
7,000
4.300
216,340
30,000
623.000
$869 340
2
AUG 08 '97 08:54AM CAMP DRESSER & MC KEE
Accordini:Iy, the following modificatiom; are made to paragraph 4.1 of Exhibit A to the
AGREEMENT: .
"4.1 For the Basic Services performed, the OWNER agrees to pay the ENGINEER fees not to
exceed SZ.200,258, based upon the following elements:
4.1. l Tl1e portion of the total fees attributable to each component of the project is as
follows:
Preliminary Design
Residuals Assistance and Study
First Amendment -Floc/Sed Equipment Investigation
Second Amendment -Final Design
Third Amendment -Additional Design
• Bidding Services
-Construction Services
Total
$251,127
67,927
19,864
992,000
216,340
30,000
623.000
$2 200 258
4 .1.2 For work done by the ENGINEER except for Resident Project Representative
services, services will be billed based on an amount equal to ENGINEER's
Direct Labor Costs times a factor of 3. l for services rendered by principals and
employees engaged directly on the Project, plus out-of-pocket expenses incurred
in connection with these services, plus payment for work done by subconsultants
(outside professionals) at cost to ENGINEER. For work done by the
ENGINEER in providing full-time Resident Project Representative services,
these services will be billed based on an amount equal to ENGINEER's Direct
Labor Costs times a factor of 2.3."
4 . Reason for TIIlRD AMENDMENT
1.5 Additional Design Investigations and Final Design
1) Filter pipe gallery flooding. Under certain operational procedures , the filter
gallery between Fiher No. 3 and No. 4 floods during backwash. Extensive field
and hydraulic investigation revealed a partial blockage in the drain piping, pipe
sagging, and serious air entrainment during backwash which restricts hydraulic
flow. To repair/correct these deficiencies would probably cost $100,000 to
$200,000. Fortunately, a reasonable alternate was developed near the end of the
design phase -the problem does not occur at lower backwash rates (less than
16 gpm/ft2). Granular activated carbon (GAC) as a filter medium requires a
lower backwash rate than does anthracite, and it was the OWNER's desire to
retrofit three filters with GAC rather than just two (Filters No. :Z and No . 3 ).
Therefore, by retrofitting Filter No. 4 also with GAC and backwashing at a lower
rate, the filter gallery will not flood (based on an actual test at 16 gpm/ft2 rate),
and three filters will be equipped with GAC.
2) Additional raw water facilities. By designing overflow and discharge structures
for both the North and South ReseIYoirs, it will be possible to completely avoid
(except under emergency water supply conditions) the return and reuse of waste
backwash and filter-to-waste water. This change in procedure is being strongly
U710\IOS74114T11""'!G1'4M~O.J ¥111'17 Jw 3
AUG 08 '97 08:54AM CAMP DRESSER & MCKEE
endorsed by EPA, the State Health Department, and A WW A as a way to
minimize exposure to microbial risk (Giardia and Crypto). It also should reduce
the potential for taste and odors and manganese problems. By redesigning the
City ditch turnout structure and associated yard piping, operational flexibility is
provided to select individually or mix raw water sources from the Union Avenue
Pump Station, City ditch, or the North Reservoir.
3) Potassium Permanganate Feed Modifications. The original design contemplated
a complete feed facility. The modifications to provide two facilities can be
accomplished as a no-cost design change.
4) Separate Blower Building. The initial design contemplated locating the blower
for air/water backwash in the existing filter building. Two separate locations
were attempted io the filter building, and for various reasons, would have not
worked well. It was finally decided by the ENGINEER and plant staff jointly to
relocate the blower to a separate small building adjacent to the filter building.
5) Environmental Assessment. The loan the OWNER contemplated receiving from
the Colorado Water and Power Authority is based on the recent SOW A
authorization by the federal government. Because federal funds were involved,
the NEPA requirement to prepare an Environmental Assessment must be
complied with.
6) Site Floodproofing, Drainage. After final design of the improvements to the
Project were initiated, the OWNER learned that flood studies perfonned by the
Urban Drainage and Flood Control District indicated the Allen plant was not
adequately protected from flooding by Big Dry Creek. This work item is to
prepare preliminary and final design for a berm and floodwall along the creek to
protect the plant.
7) Filtered Water Channel. Older parts of the Allen plant were constructed with
only a single concrete wall separating the filtered water channel from the
backwash water and filter-to-waste channel. Ifthere were any cracks in this
wall, it could be a serious cross connection. This issue was discussed with the
State Heaith Department. To construct a new set of channels would be very
expens.ive . The Health Department agreed that if a physical inspection revealed
channel wall integrity and/or minor repairs necessary for channel wall integrity,
and if those repairs were made, the design would be acceptable. This work item
accomplished that inspection and minor repair design.
8) Clean Well Modifications.
a)
b)
Structural repairs were investigated in 1995 and no repair work was
performed then because of high bids. The work has now been folded
into the current project and should be able to be lLccomplished at a
reasonable cost.
GAC filter services contract assistance. Rather than purchase GAC filter
material (which has a limited life and must be replaced in approximately
three years), the OWNER has opted to receive proposals for a service
4
AUG 08 '97 08:55AM CAMP DRESSER & MCKEE
contract from two activated carbon suppliers, providing for initial
furnishing of the media, six-month testing of its continued usefulness,
and ultimately, removal, disposition, and replacement. The ENGINEER
has assisted the OWNER in the review of these proposals.
c) NPDES Permit Assistance. See item 2 above. The OWNER already bas
a NPDES pennit for the South Reservoir. The ENGINEER assisted in
obtaining a pennit for the North Reservoir to provide complete
operational flexibility.
9) Lamella Plate Supplier Negotiations. Because patent and licensing agreements
expired, new suppliers of lame Ila plate packs were recognized as being in the
market in June 1997. This provided an opportunity for the OWNER to test
whether the negotiated price it had received from Parkson Corporation
($719,400) was inflated. In the end, the supplier Waterlink was selected-at a
lower price, and the City will be receiving an all stainless steel system instead of
a system with polystyrene plates .
10) Revised Design to Accommodate Waterlink . The Waterlink system requires
three beams to support the plate packs versus four beams as required for the
Parkson system . The smaU cost for redesign is worth the savings and improved
material received ~ see item 9) above .
1 l) Design, Specifications for Repair/Refinish of Exterior Insulation Finish System.
The existing system for the filter plant involves a polystyrene insulation overlain
with Y.-incb stucco. At comers of the building where "dings" have occurred, and
at locations where woodpeckers have drilled a hole through the stucco finish
(about 50 holes), plant personnel have attempted to patch the dings and holes.
The color of the original stucco finish has bleached, and the newer repairs show
a blotched pattern on the walls. This design effort is to put an additional
protective coating over the stucco to make it "woodpecker-proof" and to restore
the exterior trim finish for the windows and doors .
1.6 Bidding Phase services. Advertisement for bids is scheduled for October I, 1997.
Authorization of this services is now timely.
l . 7 Constroction Phase Services Bids are scheduled to be taken October 31, 1997 . Because
there are many bid alternatives and some negotiations with the apparent low bidder may
be necessary, it is anticipated that bids will be left open for 60 days, and the construction
contract may not be awarded until December 31 , 1997 . Th is authorization for
construction phase services must be given in any case in the next three months, so it has
been included heroin to reduce paperwork .
All other terms and conditions of the AGREEMENT of May 6, 1996, as amended remain in full force
and effect.
IN WITNESS WHEREOF, the parties hereto have executed this AGREEMENT to be effective as of the
date first above written .
0710\IOS74\1~1DNMGlVIMl!ND.J &11197 jw s
AUG 08 '97 08=55AM CAMP DRESSER & MCKEE P.7/7
OWNER: ENGINEER:
Cicy ofEn;lewood Camp Presser & McKee Inc
By: Thomas J. Bums .By: Carl P. Houck
Title: Mayor Title: Vice Prcsisient
Address for giving notices: Address for giving notices:
City of Englewood 13 31 1 Zth Street. Suite 1200
3400 South Elati.Street Denyer. Colorado 80202
Englewood. Colorado 801 JO
0710\10'"741l47DNMG1'.i\Ml!ND .J llN9'I' jw 6
-RU G 2 0 '97 11=44RM CRMP DRE SS ER & MCK ll
City of Englewood Water Board Pruentation
August 20, 1997
Allen WTP Improvements
Presentation Outline
l. Overview of Project
a) Project Facilities
-Tent talk diagram
-Alternate Bid Items
1) Raw Water Delivery System Improvements
Allow swapping of water rights to yield obtaining a greater
quantity of high quality water and avoid recycling potentially
contmtinatcd water through the plant.
2) Sludge Dewatering Building and Drying Arca
3) For the south filters, air :K:our and OAC
4) Improvements to the filter· to-waste faoilities for the south fibr:n.
b) Water Quality
-How will new treatment help solve the dirty water problems
• Improved chemical feed facility for river water
•New chemical feed facility for City Ditch water
• Nonh Reservoir taken out of service and cleaned
• How will the new treatment facilities help solve the taste and odor problems
• Improved chemical feed facilities -pre-oxidants
• Granular Activated Carbon Facilities
II. Changes to Project
a) FaciJitic:& • Major Changes
• Cost Reduction Items
• Keep the same size piping for the north filter inlet and outlet -very
expensive to enlarge, due to significant structural modifications. The
plant will still have adequate filtration capacity .
• Eliminating the additional office space and building modifications -
plant staff havo said that they can utilize the existing building
• Deleted sludge thickener from project. All solids will be taken to the
washwater reservoir for processing.
• Deleted third pretreatment train . Negotiations with the Health
Department have allowed the elimination of a third process unil
HU~ c~ -~r i 1:44Hf'1 CRMP DRE SS ER & MCK EE
-Cost Increase Item&
• Enclosed walkway between the existing filter building and the new
pretreatment building.
• Sole-sourced equipment to match cxistin& equipment and meet
operations staff preferences.
• Disinfection baftle in clear well to improve disinfection capabilitie1 .
that was somewhat lost with the incorporation of Granular Activated
Carbon .
* Flood proofing the site • unanticipated. Site was flood proofed in
the 1980 improYement&. A recent flood analysis yields a higher flood
plain which puts the Allen WTP in the flood plain. Removing the plant
from the flood plain is necessary to obtain approval of the health
department and to obtain loan . The City is being proactive in
designing facilities to remove the plant from the flood plain .
•Modifying one of the south filten to include Granular Activated
Carbon and Air Scour . An original altcmate bid item, now necesaitated
to eliminate the ongoing problem oftbe flooding filter pipe gallery.
• Repairs to wood pecker holes in the exterior of the existing building.
b) Project Construction Com
-Predesign Base Project Construction Cost Estimate"" $10.38M
·Current estimated Bue Project Construction Cost = $1 lM
Altemste Bid Jtmt
I
2
3 (for 2 filters)
4
E;rtimm GmJ:StwctiQP ~
$470,000
$670,000
$240,000
$170,000
Total Estimated Construction Costs, including all Alt. Bid Items ,,.
$12 .SSM
COUNCIL COMMUNICATION
Date Agenda Item Subject
September 2, 1997 COM Contract Amend. #3
Initiated By Staff Source
Utilities Department Stewart Fonda , Director of Utilities
COUNCIL GOAL AND PREVIOUS COUNCIL ACTION
Council approved the Second Amendment to Agreement with Camp Dresser & McKee (COM)
in February 3, 1997 for the Final Design Proposal for the Allen Filter Plant Improvements ..
RECOMMENDED ACTION
Council approval , by motion , of Contract Amendment No . 3 for design modifications for the
Allen Filter Plant improvements .
BACKGROUND, ANALYSIS, AND ALTERNATIVES IDENTIFIED
COM studied the existing water treatment facilities of the City and prepared a Preliminary
Design for the Allen Filter Plant Improvements . Public concern over water quality issues such
as taste and odor, cryptosporidium and giardia, together with the requirement to meet
increasingly stringent regulations resulting from the 1986 Safe Drinking Water Amendment
have prompted upgrading of the current water treatment facilities .
Public meetings were held and a rate increase to fund the improvements was adopted.
Preliminary design by COM was approved by Council on May 6, 1996. The Final Design
Proposal was approved February 3, 1997 .
The proposed Third Amendment to Agreement is for additional design investigations that will
address the following; retrofitting Filter No . 4 to prevent filter pipe gallery flooding, designing
overflow and discharge structures for both the North and South Reservoirs, potassium
permanganate feed modifications , blower relocate to a separate building adjacent to the filter
building, environmental assessment to comply with NEPA loan requirements , berm and
floodwall design at Big Dry Creek to provide drainage and floodproof the Plant, and an
inspection of channel wall integrity and/or minor repairs . This channel separates the filtered
water from the backwash water and the filter-to-waste channel.
The Third Amendment would also address clear well modifications for repair work, GAC filter
services contract facilitation and NPOES Permit assistance for the North Reservoir. Other
items covered by this Amendment would include Lamella Plate supplier negotiations , design
revision to accommodate a Waterlink system and design specifications to repair and refinish
the existing filter plant exterior.
FINANCIAL IMPACT
The Third Amendment to the Agreement between the City of Englewood and COM includes
design modifications as well as the next proj ect phase work for bidding and construction
phase services . (COM letter dated August 8 , 1997 .) This Amendment raises the engineering
fees for this project to $2 ,220 ,258. The water rate increase to fund this project was passed by
Council on March 18 , 1996. This is a budgeted item .
LIST OF ATTACHMENTS
Letter dated Aug. 8 , 1997 from COM
Third Amendment to Agreement
THIRD AMENDMENT TO AGREEMENT
This THIRD AMENDMENT made this ____ day of _____ 1997 between the City of
Englewood, Colorado ("OWNER") and Camp Dresser & McKee Inc. ("ENGINEER") modifies the
AGREEMENT between the OWNER and the ENGINEER dated May 6, 1996.
The AGREEMENT is modified by this THIRD AMENDMENT to (1) provide modifications to the final
design of improvements to the Allen WTP; (2) Bidding Phase Services; and (3) Construction Phase
Services. Specifically, the following modifications to Exhibit A to the AGREEMENT are agreed to:
1. Add the following paragraphs to Exhibit A:
"1.5 Additional Design Investigations and Final Design:
1) Investigate and report on filter pipe gallery flooding during backwash
2) Design additional raw water piping, metering, overflow and discharge structures
for the North and South Reservoirs and redesign of City Ditch turnout structure
3) Potassium Pennanganate feed modifications -relocate plant feed room and
modify existing pump station for second feed facility
4) Relocate blower facility to a separate building
5) Prepare an Environmental Assessment for CW&PA Loan Application
6) Prepare predesign and design of site flood proofing and drainage
7) Perfonn an inspection of the filtered water channel; prepare a report, and design
repairs
8) Incorporate the Clearwell Modification Project into the Project, and provide
assistance with GAC Filter Media Service Contract and in obtaining NPDES
Discharge Pennits
9) Evaluate a new round of proposals from lamella plate pack suppliers
10) Revise design of Pretreatment Facility to accommodate Water link Supersettler
plate system
11) Perfonn a design investigation and prepare specifications for (a) repairs to the
holes and nicks in the Exterior Insulation Finish System (EIFS), (b) re-coating of
the entire EIFS, and ( c) refinishing of doors and windows
1.6 The Bidding Phase Services described in paragraph 2.3. of the AGREEMENT are hereby
authorized. The net cost for printing of the contract documents issued during the
Bidding Phase will be paid for by the OWNER. Net cost is defined as the actual cost of
printing as arranged for by the ENGINEER less the net value of the document deposit
0710\IOS74\1470NMG'l\AMEND.3 811197 jw
,. . ved and held by the ENGINEER from prospective bidders after all refunds have
;n issued.
The Construction Phase Services described in paragraph 2.4 of the AGREEMENT are
hereby authorized."
.ne schedule for performance ofENGINEER's services in the THIRD AMENDMENT is as
follows:
1.5
1.6
1.7
Additional Design Investigations and
Final Design
Bidding Phase Services
Construction Phase Services
Commence Work Complete Work
Work underway October 31, 1997
October I, 1997 December 31, 1997
November I, 1997 May 1, 1999
(substantial completion)
August 31 , 1999
(final completion)
3. Payment of Services rendered by ENGINEER. The following are budget costs for services
authorized by this THIRD AMENDMENT:
1.5 Additional Design Investigations and Final Design
1) Filter pipe gallery flooding $ 10,880
2) Additional raw water facilities 18,000
3) Additional Potassium Permanganate facilities 0
4) Separate Blower Building 59,000
5) Environmental Assessment 5,300
6) Site Floodproofing, drainage -preliminary design 18,460
-design 57,500
7) Filtered Water Channel -inspection and report 8,300
-design 9,200
8) Clearwell Modifications -design 3,400
GAC Filter Service Contracts and NPDES Discharge 6,500
Permits -assistance
9) Lamella plate pack supplier negotiations 8,500
10) Revised design to accommodate Waterlink 7,000
11) Design, specifications for repair/refinish of Exterior 4.300
Insulation Finish System
Subtotal, Additional Design 216,340
1.6 Bidding Phase Services 30,000
1.7 Construction Phase Services 62J,OQO
Total $862,J40
0710\IOS74\147DNMGl\AMEND.J 818197 jw 2
Accordingly, the following modifications are made to paragraph 4.1 of Exhibit A to the
AGREEMENT:
"4.1 For the Basic Services performed, the OWNER agrees to pay the ENGINEER fees not to
exceed $2,200,258, based upon the following elements:
4.1.l The portion of the total fees attributable to each component of the project is as
follows:
Preliminary Design
Residuals Assistance and Study
First Amendment -Floc/Sed Equipment Investigation
Second Amendment -Final Design
Third Amendment -Additional Design
-Bidding Services
-Construction Services
Total
$251, 127
67,927
19,864
992,000
216,340
30,000
623.000
$2.200.258
4.1.2 For work done by the ENGINEER except for Resident Project Representative
services, services will be billed based on an amount equal to ENGINEER's
Direct Labor Costs times a factor of 3. I for services rendered by principals and
employees engaged directly on the Project, plus out-of-pocket expenses incurred
in connection with these services, plus payment for work done by subconsultants
(outside professionals) at cost to ENGINEER. For work done by the
ENGINEER in providing full-time Resident Project Representative services,
these services will be billed based on an amount equal to ENGINEER's Direct
Labor Costs times a factor of 2.3."
4. Reason for THIRD AMENDMENT
1.5 Additional Design Investigations and Final Design
1) Filter pipe gallery flooding. Under certain operational procedures, the filter
gallery between Filter No. 3 and No. 4 floods during backwash. Extensive field
and hydraulic investigation revealed a partial blockage in the drain piping, pipe
sagging, and serious air entrainment during backwash which restricts hydraulic
flow. To repair/correct these deficiencies would probably cost $100,000 to
$200,000. Fortunately, a reasonable alternate was developed near the end of the
design phase -the problem does not occur at lower backwash rates (less than
16 gpm/ft2). Granular activated carbon (GAC) as a filter medium requires a
lower backwash rate than does anthracite, and it was the OWNER's desire to
retrofit three filters with GAC rather than just two (Filters No . 2 and No. 3).
Therefore, by retrofitting Filter No. 4 also with GAC and backwashing at a lower
rate, the filter gallery will not flood (based on an actual test at 16 gpm/ft2 rate),
and three filters will be equipped with GAC.
2) Additional raw water facilities. By designing overflow and discharge structures
for both the North and South Reservoirs, it will be possible to completely avoid
(except under emergency water supply conditions) the return and reuse of waste
backwash and filter-to-waste water. This change in procedure is being strongly
0710\IOS741147DNMGTIAMEND.3 811197 jw 3
endorsed by EPA, the State Health Department, and A WW A as a way to
minimize exposure to microbial risk (Giardia and Crypto). It also should reduce
the potential for taste and odors and manganese problems. By redesigning the
City ditch turnout structure and associated yard piping, operational flexibility is
provided to select individually or mix raw water sources from the Union Avenue
Pump Station, City ditch, or the North Reservoir.
3) Potassium Permanganate Feed Modifications. The original design contemplated
a complete feed facility. The modifications to provide two facilities can be
accomplished as a no-cost design change.
4) Separate Blower Building. The initial design contemplated locating the blower
for air/water backwash in the existing filter building. Two separate locations
were attempted in the filter building, and for various reasons, would have not
worked well. It was finally decided by the ENGINEER and plant staff jointly to
relocate the blower to a separate small building adjacent to the filter building.
5) Environmental Assessment. The loan the OWNER contemplated receiving from
the Colorado Water and Power Authority is based on the recent SDWA
authorization by the federal government. Because federal funds were involved,
the NEPA requirement to prepare an Environmental Assessment must be
complied with.
6) Site Floodproofing, Drainage. After final design of the improvements to the
Project were initiated, the OWNER learned that flood studies performed by the
Urban Drainage and Flood Control District indicated the Allen plant was not
adequately protected from flooding by Big Dry Creek. This work item is to
prepare preliminary and final design for a benn and floodwall along the creek to
protect the plant.
7) Filtered Water Channel. Older parts of the Allen plant were constructed with
only a single concrete wall separating the filtered water channel from the
backwash water and filter-to-waste channel. If there were any cracks in this
wall, it could be a serious cross connection. This issue was discussed with the
State Health Department. To construct a new set of channels would be very
expensive. The Health Department agreed that if a physical inspection revealed
channel wall integrity and/or minor repairs necessary for channel wall integrity,
and if those repairs were made, the design would be acceptable. This work item
accomplished that inspection and minor repair design.
8) Clear Well Modifications.
a)
b)
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Structural repairs were investigated in 1995 and no repair work was
performed then because of high bids. The work has now been folded
into the current project and should be able to be accomplished at a
reasonable cost.
GAC filter services contract assistance. Rather than purchase GAC filter
material (which has a limited life and must be replaced in approximately
three years), the OWNER has opted to receive proposals for a service
contract from two activated carbon suppliers, providing for initial
4
furnishing of the media, six-month testing of its continued usefulness,
and ultimately, removal, disposition, and replacement. The ENGINEER
has assisted the OWNER in the review of these proposals.
c) NPDES Pennit Assistance. See item 2 above. The OWNER already has
a NPDES pennit for the South Reservoir. TI1e ENGINEER assisted in
obtaining a permit for the North Reservoir to provide complete
operational flexibility.
9) Larnella Plate Supplier Negotiations. Because patent and licensing agreements
expired, new suppliers of larnella plate packs were recognized as being in the
market in June 1997 . This provided an opportunity for the OWNER to test
whether the negotiated price it had received from Parkson Corporation
($719,400) was inflated. In the end, the supplier Waterlink was selected -at a
lower price, and the City will be receiving an all stainless steel system instead of
a system with polystyrene plates .
10) Revised Design to Accommodate Waterlink. The Waterlink system requires
three beams to support the plate packs versus four beams as required for the
Parkson system . The small cost for redesign is worth the savings and improved
material rece ived -see item 9) above.
11) Design, Specifications for Repair/Refinish of Exterior Insulation Finish System.
The existing system for the filter plant involves a polystyrene insulation overlain
with Y-i-inch stucco. At comers of the building where "dings " have occurred, and
at locations where woodpeckers have drilled a hole through the stucco finish
(about 50 holes), plant personnel have attempted to patch the dings and holes.
The color of the original stucco finish has bleached , and the newer repairs show
a blotched pattern on the walls . This design effort is to put an additional
protective coating over the stucco to make it "woodpecker-proof'' and to restore
the exterior trim finish for the windows and doors.
1.6 Bidding Phase services. Advertisement for bids is scheduled for October 1, 1997.
Authorization of this services is now timely .
1.7 Construction Phase Services Bids are scheduled to be taken October 31 , 1997. Because
there are many bid alternatives and some negotiations with the apparent low bidder may
be necessary, it is anticipated that bids will be left open for 60 days, and the construction
contract may not be awarded until December 31 , 1997 . This authorization for
construction phase services must be given in any case·in the next three months, so it has
been included herein to reduce paperwork.
All other terms and conditions of the AGREEMENT of May 6, 1996 , as amended remain in full force
and effect.
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IN WI1NESS WHEREOF, the parties hereto have executed this AGREEMENT to be effective as of the
date first above written.
OWNER: ENGINEER:
City of En~lewood Camp Dresser & McKee Inc.
Thomas J. Bums Carl P. Houck
Title: Mayor Title: Vice President
Address for giving notices: Address for giving notices:
City of Englewood 1331 17th Street. Suite 1200
3400 South Elatj Street Denver. Colorado 80202
Englewood. Colorado 80110
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