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Home My WebLink About1990-07-10; Municipal Water District; 032; Amendment-Dudek & Associates Maerkle Pump StationdMWD - AGENDA BILL . DEPT. ADMIN+ AMENDMENT TO DUDEK & ASSOCIATES, INC. SCOPE OF WORK FOR MAERKLE PUMP STATION RECOMMENDED ACTION: Adopt Resolution No. 670 approving amendment to Dudek C Assoc- iates, Inc. revising their scope of work for design of the Maerkle Pump Station and Disinfection Facilities, CMWD Project No. 89-109, and increasing the contract amount from $165,000.00 to $202,140.00. ITEM EXPLANATION Design of the proposed Maerkle Pump Station and Disinfection Facilities is continuing. The contract called for the design to incorporate two 12.5 cfs pumps and two smaller 2.0 cfs pumps and to design the piping to allow for an additional 12.5 cfs pump. The revised scope changes the project plans and specifications to reflect changes in the pumping equipment and control schemes. These changes consist of the following items: eliminate the two smaller 2.0 cfs pumps and revise the number of the larger pumps from 2 to 4 (12.5 cfs pumps) and to modify the control system to include time-of-day control features. Changes in associated equipment and systems required by these pumping system modifications are also included. Other changes have also occurred which directly affect the level of effort required to complete the design work on this project. Specifically, the Fire Department review, and the requirement for City staff review, will require additional efforts by Dudek & Associates, Inc. to coordinate review and incorporate comments. The consultant requires additional time in reviewing: compatibility with the new draft District Master Plan; and in determining the impact of the requested changes; and coordinating preparation of the revised scope of work. Staff has met with the consultant during the course of the design and these requested changes are required to conform to the data supplied by the District's updated Potable Water Master Plan. $1 FISCAL IMPACT There is $3,000,000.00 available for design and construction of the Maerkle Pump Station and Disinfection Facilities for the 1990-91 fiscal year. This increase in the consultant's contract amount is $37,140.00 and monies are available for this change. l- 2 n EXHIBITS Resolution No. 670. Dudek 81 Associates letter dated April 23, 1990 RESOLUTION NO. 670 RESOLUTION OF THE BOARD OF DIRECTORS OF THE CARLSBAD MUNICIPAL WATER DISTRICT APPROVING AMENDMENT TO DUDEK &i ASSOCIATES, INC. SCOPE OF WORK FOR MAERKLE PUMP STATION WHEREAS, the design of the proposed Maerkle Pump Station is continuing, and WHEREAS, changes are required to conform to the data supplied by the District's updated Potable Water Master Plan, and WHEREAS, these changes will require an increase on the consultant's contract amount of $37,140.00. NOW, THEREFORE, the Board of Directors of the Carlsbad Municipal Water District hereby approve the change and authorize the increase. PASSED, APPROVED AND ADOPTED at a regular meeting of the Carlsbad Municipal Water District held on the 10th day of July I 1990, by the following vote, to wit: AYES: Board Members Lewis, Kulchin, Pettine, Mamaux and Larson NOES: None ABSENT: None CLAUDE k/l%WIS, President ANN J. KULCHIN, Vice-President ATTEST: a- ALETHA L. RAUTENKRANZ, Seer . (SEAL) DUDEK k ASSOClnIES, INC. . o.F TI,,:.; .II~\.I tlh I,l,i.l.. i ‘i b),‘,‘.‘G 1(,]91 a+J.i;;; l t.,\ .\,. ~f~l~l~ I~j--ZIt- 190-03 April 23, 1990 Mr. Robert Greaney General Manager and District Engineer Carlsbad Municipal Water District 5750 El Camino Real Carlsbad, CA 92008 Re: Maerkle Pump Station, Final Design Changes CMWD Project No. 89-109 Dear Bob: /’ 1 :; . As discussed last Thursday by telephone and at our meeting of March 13, 1990, this letter is being delivered for discussion of a request for a change in scope of work, fee, and schedule for the Maerkle Pump Station and Disinfection Facilities Project. On March 5, 1990, subsequent to our District review meeting of February 15, 1990, the District requested a change in the number of pumps and ultimate pump station capacity. This request has been reviewed by Dudek and Associates, Inc. (DAI). Our proposed scope of work revision, based on our current understanding of the objectives of CMWD, is as follows: Revise the project plans and specifications for the Maerkle Pump Station and Disinfection Facilities, CMWD Project No. 89-109 to reflect changes in the pumping equipment and control schemes. These changes consist of the following items: eliminate the two 2-CFS pumps, eliminate one future 12.5-CFS pump, revise number of 12.5CFS pumps included in this project from two to four, and modify the pump control system to include time-of-day control features. Changes in associated equipment and systems required by these pumping system modifications are also included. Enclosed are revisions to the site development plan for the pump station site proposed by Dudek Sr Associates, Inc. to take advantage of the reduced number of pumps in the ultimate configuration. The attached revised site plan eliminates the pier-supported retaining wall and will decrease overall construction costs. I* ‘I a,. , ’ I Mr. Robert Grcaney -- - Page Two ,d ., I The anticipated changes in construction cost for this project are as follows: Previous anticipated construction cost %2,2SO,OOO Eliminate two 2-CFS pumps Reduced sitework costs Add two 12.5~CFS pumps Additional supporting equipment (90,000 > (15,000 ) 430,000 25 .OOO Revised anticipated construction cost $2,600,000 The requested changes result in an anticipated net increase in construction cost of $350,000.00, or 15.6 percent. A detailed revised engineers estimate of construction cost will be provided with the final design prior to advertising. Although the changes are easily accommodated and simplify the overall system, they affect a large percentage of the sheets and will require expenditure of a considerable number of manhours to properly revise the existing plans. Other changes have also occurred which directly affect the level of effort required to complete the design work on this project. Specifically, the Fire Department review, and the requirement for City staff review, will require additional efforts by DAJ to coordinate review and incorporate comments. We have also expended additional time in reviewing: compatibility with the new draft District Master Plan; and in determining the impact of the requested changes; and coordinating preparation of the revised scope of work. Our estimate of additiona manhours necessary to complete the project, considering the changes and additional review and coordination effort are as follows: Item Added Hours Original Hours % Inc. General and Civil Sheets 72 410 17.6 Mechanical Sheets 160 1034 15.8 Structural 80 570 14.0 Specifications 48 196 24.5 Meetings, Coordination 80 293 27.3 As you are aware, we began work on the Squires Reservoir Needs Study in May, 1988 and our design efforts on the Maerkle Pump Station began in April, 1989. Our billing rates have not changed since we first began work on the Squires Reservoir Needs Study in May 1987. Our rate structure has changed several times in that period of time, and we therefore request that you authorize an increase in billing rates to those currently in effect for the construction assistance for the Maerkle Tank Project. Based on the revised billing rates, our requested compensation would be as follows: . . . * . :, * ‘Mr. Robert Greaney -- Page Three Labor Classification Hours Rate Amount Supervising Engineer Associate Engineer Assistant Engineer Designer/Drafter III Clerical I1 40 $95.00 %3,800.00 loo . 70.00 7,ooO.OO 100 60.00 6.000.00 160 55.00 8,800.OO 40 36.00 1.440.00 Dudek and Associates Labor $27,040.00 Subconsultants (Mullen and Associates) Printing and Miscellaneous 9,900.oo 200.00 Total $37,140.00 This estimate of additional costs is based on our understanding of the level of effort required to process the plans and specifications through the City of Carlsbad. Dudek and Associates would like to reserve the right to request additional compensation if the plan review process results in additional delays and requires an unusual level of effort by Dudek and Associates. We propose the following timeframes for completion of’this project: 100 % Revisions by Dudek and Associates Review by CMWD, City of Carlsbad, Fire Dept. Final Revisions by Dudek and Associates Advertise and Bid period Bid opening and Board approval 4 weeks 4 weeks 2 weeks 4 weeks 2 weeks Actual dates associated with the above timeframes are dependent on when DAI receives approval to proceed with the requested changes. If DAI is authorized to proceed by May 4, the project would be advertised in mid-July, with construction occurring from September, 1990 to July, 1991. ThaIlk you for meeting with us to discuss these matters. We will await authorization from you before proceeding further. Very truly yours, Dudek & Associates, Inc. Project Manager Enclosures DETAILED SUMMARY OF IMPACTS The requested changes in pumping equipment and site layout will directly affect 25 of the 48 sheets in the planset for this project. The city review requirements will potentially affect all of the Structural and Electrical sheets, All equipment, mechanical, electrical, and instrumentation specification sections must be revised to reflect the revised equipment quantities, numbering, and operational modes. Eight sections totalling 131 pages are directly affected, and additional sections must be reviewed for impacts. A summary of the impacts on the plan sheets is provided below. G-l G-2 G-3 G-4 G-5 G-6 Change in Board of Directors Ejone Revise to eliminate the 2 CFS pumps None Revise to eliminate the 2 CFS pumps and associated equipment None C-l c-2 c-3 c-4 Revise to eliminate the 2 CFS pumps and one 12.5 CFS pump, revise layout and grading Revise to eliminate the 2 CFS pumps and one 12.5 CFS pump, revise layout and grading None Revise profiles M-l M-2 M-3 M-4 Revise to match new layout per M-3 M-5 Eliminate Chlorination and Ammonia feed equipment for 2 CFS pumps M-6 Eliminate Chlorination and Ammonia feed equipment for 2 CFS pumps M-7 Add second air conditioning unit required by VFD’s for added pumps M-8 None M-9 None S-l s-2 s-3 S-4 S-S S-6 s-7 S-8 s-9 None None Revise pump layout, flowmeter vault, provide four 12.5 cfs pumps in this contract None None None None None None None Revise retaining wall details, eliminate piers None ’ . . _’ . ’ ’ ’ Detailed Summary of !--cts 5 ‘. ! s-10 S-l 1 s-12 S-13 All S-Sheets E-l E-2 E-3 E-4 t 3 E-5 E-6 E-7 E-8 E-9 E-10 E-11 E-12 E-13 All E-Sheets I-1 Revise to eliminate System 10 I-2 Revise numbering I-3 Revise Control Panel Elevation None None Replace with revised vault design None Additional City Review None Revise to reflect new site layout None Revise to eliminate the 2 CFS pumps, all related equipment, and one 12.5 cfs pump. Provide all remaining equipment in this project. Revise Load calculations as required. Revise to reflect new site layout Revise to reflect new site layout None None Revise control diagrams Revise control diagrams Revise conduit schedules Revise panel schedules Revise MCC Elevations Additional City Review . Page Two