1e Change Order Well No. 9CITYOF
CHANHASSEN
7700 Market Boulevard
PO Box !47
Ohanl'assen MN 5531 ?
Administration
Phone; 952227'1100
Fax; 95222? 1110
Building Inspections
Phar/e: 952 227 1180
Fax: 952 2271190
[ngineering
Phone: 9522271160
Fax: 952 2271170
Finance
Phone: 952227 11,$0
Fax: 9522271110
MEMORANDUM
TO:
FROM:
DATE:
SUB J:
Todd Gerhardt, City Manager
Patti Oehme, City Engineer/Dir. of Public Works
August 3, 2004
Consider Change Order No. 1 for Well No. 9 Improvements
Project No. 03-02
REQUESTED ACTION
Approve Change Order No. I for Well No. 9 Improvements in the amount of
$27,542.50.
BACKGROUND
Park & Recreation
Phone: 9522271120
Fax: 9522271110
Recrea'do[ Center
2310 Coulter Boulevard
Phone; 952 2271400
Fax 9522271404
The City Council approved plans and specifications for Well No. 9 on March 22,
2004.
The City Council authorized the well drilling contract on May 10, 2004.
DISCUSSION
Planning &
Natural Resources
Phone 952 2271130
Fax: 952 227 1110
Public Works
1591 Park Road
Phone: 9522271300
Fax: 952227 1310
The Well No. 9 contractor has encountered a changed condition in the geologic
formations at the well site. The original design called for establishing an 18-inch
diameter casing through the Prairie du Chien formation with an 18-inch diameter
open hole below this formation into the Jordan formation. This open hole in the
Jordan formation would allow water from the formation to be pumped to the
City's water system.
Senior Cenler
Phone: 952.2271125
Fax: 952227 1110
Web Site
'~c~vw ci chanhassen fnrl Js
The well driller has encountered a significantly fractured Prairie du Chien
formation. This formation does not appear to be able to structurally support the
18-inch casing as originally designed. The test well performed prior to the
drilling the well was unable to confirm the integrity of the Prairie du Chien
formation due to the size and scope of test wells. In order to establish the casing
in the hole and maintain the integrity of the rock and gravel formation around the
well, a screened-type well design will need to be utilized with a gravel pack
around the screen. This screen would extend through the Jordan aquifer. This
type of well design will not affect the potential capacity of the well, and is similar
to the well design cun'ently in place at Well Nos. 5 and 6.
The change order is in the amount of $27,542.50. The City's consultant for Well
No. 9 has reviewed the scope of the change order and amount and finds it
The City ct Chanhassen * A growing comrrunit? with clean lakes quality $£hools
Todd Gerhardt
August 3, 2004
Page 2
acceptable. The amount is consistent with screened well bids on other well
construction projects.
Staff recommends Council approve Change Order No. 1 for Well No. 9
Improvements in the amount of $27,542.50.
Attachments
G:\F, NG\I~UBLIC\03 02\bg C}lmlge ~drr #1 080904.dt~c
SECTION 00991 - CIIANGE ORDER
(Instructions on reverse side) No. 1
PROJECT: Well No. 9- Construction
DATE OF ISSUANCE: July 29, 2004 EFFECTIVE DATE: July 29, 2004
OWNER: City of Chanhassen
OWNER's Contract: Well No. 9 - Construction
CONTRACTOR: Mark J. Traut Wells ENGINEER: Bolton & Menk, Inc.
You are directed to make the fi)llowing changes in the Contract Documents.
Description:
Modify well design to utilize a well screen type design. See attached table for modifications to Schedule of Unit
Prices..
Reason for Change Order:
PraMe-Du-Chien Formation is structurally unable to support 18" casing as originally designed. Screen type design
with gravel pack will provide appropriate support.
Attachments: (List documents supporting change)
Revised Figure A-4.
CHANGE IN CONTRACT PRICE:
Original Contract Pricc
$521.330.00
Net changcs from previous Change Ol'dcrs No.__to No.__
$ 0.0
Contract Price Prior to this Change Order
$521.330.00
Net Increase (lncreasc/Dee:'ease) of this Change Order
$27,542.50
Contract Price with all approved Change Orders
$548~872.50
CHANGE IN CONTRACT TIMES:
Original Contract Times
Substantial Completion :__days or dates
P, cad7 for final paement :~150 days or datcs
Net changes from previous Change Orders No.__to No.__
0 days
(?ontract Titncs prior to this Change Order
Substantial Completion : days or dates
Ready for final pa?~cnt :~150 days or dates
Nct Increase (lucrease/Dec:-ease) of this Change Ordcr
0~days
Contract Times with all approved Change Orders
Substantial Completion :_ days or dates No,,'. 25. 2003
Ready for final payment : 150 ditys or dates Nov.. 25, 2003
P, ECOM MENDEI):
AI)PP, OVED:
AC(?EPTED:
By:
Date:
Engineer (Authorized Signature)
By:. By:
Owner (Authorized Signature)
Date: Date:
Contractor (AuOiorizcd Signature)
EJCDC No. 1910C8-B (1990 Edition)
Prepared by the Engineers Joint Contract Documents Committee and cndorscd by The Associated General Contractors of America.
CHANGE ORDER
PAGE 00991-1
CHANHASSEN, MINNESOTA
PROPOSED WELL NO. 9
WELL PROFILE
+3
Ground El.
Surficial Deposits
(Clay/Rocks/Sand)
30" Steel Casing
Grout
180'
180'
24" Steel Casing
365'
Prairie du Chien Formation
(Boulders/Limestone)
373'
Grout
365'
18" Steel Casing
373'
Gravel Pack
Jordan Formation
(Sandstone)
498'
Proposed 12"
SS Screen
FIGURE A-4
(Rev. 7/29/04)