The URL can be used to link to this page

Home My WebLink AboutC35310 - Modified Scope of Work - Line 4 Drainage Prjct CONTRACT NO. C35310 STAFF REPORT CITY OF PALM DESERT PUBLIC WORKS DEPARTMENT MEETING DATE: April 12, 2018 PREPARED BY: Ryan Gayler, Project Administrator g4 REQUEST: Approve the modified scope for the Line 4 drainage project. (Project No. 522-16) Recommendation By Minute Motion: Approve the modified scope for the Line 4 drainage project. (Project No. 522-16) Strategic Plan The proposed action will further the goals of the strategic plan by providing a safe and efficient transportation system for both residents and visitors. Background Analysis In October 2007, VA Consulting, Inc. prepared the North Sphere Drainage Master Plan (NSDMP) which examined the entire City, north of Country Club Drive. The purpose was to have a plan to accommodate storm water as the area began to develop. The north east portion of the City was to be served by a storm drain system called Line 4. The NSDMP provides a general idea of what facilities are necessary to reduce the likelihood of flooding and water damage. According to the NSDMP, Line 4 would include pipe as large as seventy-two (72") inches in diameter that would empty into a future detention basin to be constructed in Bermuda Dunes, just east of Washington Street. The entire Line 4 system was estimated to cost over $23 million. The major storm of September 2014 flooded Country Club Drive and Washington Street, and acted as a catalyst to begin the design of the Line 4 drainage project. Due to the significant scope and estimated cost of the project, the City issued an RFP for an engineering firm to perform a feasibility study to look at several different alignments for the storm drain, and to determine if the detention basin in Bermuda Dunes was the best place for the system to outlet. Once the best alignment was determined, the consultant was to perform survey, utility research, hydrological and hydraulic analysis, environmental documentation, and right-of-way services, if necessary. April 12, 2018 - Staff Report Approve the modified scope for the Line 4 Drainage Project (Contract No. C35310) Page 2 of 2 In May 2016, the City Council awarded a contract (Contract No. C35310) to Michael Baker International (MBI) to perform the preliminary design engineering and feasibility study. MBI indicated in their proposal that they would use an innovative, value-added approach to more accurately size the storm drain facilities. MBI found that using the advanced hydrology and hydraulic modeling for storm flows they could split the large contiguous pipeline into three much smaller project areas (see attached vicinity maps) and retain the storm water entirely within the city limits. Since the storm water will remain within the City, the City will no longer need to purchase a large parcel of land and construct a basin in Bermuda Dunes, so the environmental and right-of-way services can be reallocated to additional design services. In addition, the modeling indicated that the pipe size could be reduced significantly resulting in considerable cost savings for the project, reducing the estimated construction cost from $23 million to $5 million. MBI completed the feasibility study, preliminary engineering and utility research. MBI has worked very efficiently and has requested of the City that they be allowed to complete the final engineering plans and project specifications. MBI has submitted a revised scope and cost proposal which reallocates the remaining funds to the tasks needed to complete the project. Therefore, the modification will not result in an increase in the budget for the project. The original contract amount was $281,744. MBI was able to complete the original scope at a cost of$195,054. The remaining $86,690 will be used to complete the final engineering plans and specifications. City staff have discussed the issue with the City Attorney. Legal counsel has indicated that the modification is allowable as long as the project is completed within the original budget amount. Fiscal Analysis Since the original contract amount will not be increased, there is no fiscal impact associated with this action. LEGAL REVIEW DEPT. REVIEW FINANCIAL CITY MANAGER Approved as to Form REVIEW i:4 obe1/1oi argreavci imoth W sson, P.E. Janet Moore Lauri Aylaian City Attorney Independent Interim Director of Finance City Manager Director of Public Works ATTACHMENTS: 1. Additional scope items 2. Cost proposal for additional scope items 3. Vicinity Maps for Project Areas A, B, and C City of Palm Desert Line 4—Drainage Improvements—No.522-16 Exhibit A—Scope of Services Task 10:70%DESIGN SUBMITTAL PACKAGE(PS&E) Michael Baker will prepare a 70% Design Submittal Package which will include the proposed storm drain improvement plans, hydrology and hydraulics report,specifications, and engineer's estimate. One (1) plan set of storm drain improvement plans will be prepared for the project consisting of a title sheet,two (2) detail sheets, and thirteen (13) design sheets. The plans and all reference files will be prepared per the City's Computer Aided Design (CAD) Standards in a format compatible with the City's system. All project documents in digital/electronic format will be compatible with the City's computer applications(MS Office,Adobe Reader). One (1) hydrology and hydraulics report will be prepared which will include necessary hydrology delineations and calculations for the proposed storm drain system.The hydrology calculations shall be done in conformance with the Riverside County Flood Control and Water Conservation District Hydrology Manual. Michael Baker shall perform hydraulic calculations to support the design of the proposed storm drain facilities. Analysis of the storm drain hydraulic gradient shall be performed using the Los Angeles County "Water Surface Profile Gradient" (WSPGW) program. The design water surface generated shall be indicated on the profile drawings on the proposed design plans. Hydraulics will be performed for the 10- and 100- year storm events to ensure that the required flood protection is met in accordance with the Riverside County Hydrology Manual. One (1) set of specifications shall be prepared for the project in support of bidding, awarding contracts, and supervisions of the improvement to be constructed within the Project. Included are to be Instructions to Bidders, General Conditions,Special Provisions applicable to the specific job, Proposal Forms,and the Improvement Plans. One (1) Engineer's Construction Cost Estimate shall be prepared for the project based upon the storm drain improvement plans. Quantities shall be compiled using scaled measurements from the improvement plans. Consultant shall not be responsible for fluctuations in cost factors. Deliverables: 70%Storm Drain Improvement Plans—three(3)hard copies and a PDF copy; 70%Hydrology and Hydraulics Report—three(3)hard copies and a PDF copy; 70%Specifications—three(3) hard copies and a PDF copy; 70%Engineer's Construction Cost Estimate—three(3)hard copies and a PDF copy TASK 11:90%DESIGN SUBMITTAL PACKAGE(PS&E) Michael Baker will prepare a 90% Design Submittal Package which will include the proposed storm drain improvement plans, hydrology and hydraulics report,specifications, and engineer's estimate. One (1) plan set of storm drain improvement plans will be prepared for the project consisting of a title sheet, two (2) detail sheets, and thirteen (13) design sheets. The plans and all reference files will be prepared per the City's Computer Aided Design (CAD) Standards in a format compatible with the City's system. All project documents in digital/electronic format will be compatible with the City's computer applications(MS Office,Adobe Reader). One (1) hydrology and hydraulics report will be prepared which will include necessary hydrology delineations and calculations for the proposed storm drain system.The hydrology calculations shall be done in conformance with the Riverside County Flood Control and Water Conservation District Hydrology Manual. Michael Baker shall perform hydraulic calculations to support the design of the proposed storm drain facilities. Analysis of the storm drain hydraulic gradient shall be performed using the Los Angeles County "Water Surface Profile Gradient" (WSPGW) program. The design water surface generated shall be indicated on the profile drawings on the proposed design plans. Hydraulics will be performed for the 10- and 100- year storm events to ensure that the required flood protection is met in accordance with the Riverside County Hydrology Manual. Michael Baker INTERNATIONAL Page 11 City of Palm Desert Line 4—Drainage Improvements—No.522-16 One (1) set of specifications shall be prepared for the project in support of bidding, awarding contracts, and supervisions of the improvement to be constructed within the Project. Included are to be Instructions to Bidders, General Conditions,Special Provisions applicable to the specific job, Proposal Forms,and the Improvement Plans. One (1) Engineer's Construction Cost Estimate shall be prepared for the project based upon the storm drain improvement plans. Quantities shall be compiled using scaled measurements from the improvement plans. Consultant shall not be responsible for fluctuations in cost factors. Deliverables: 90%Storm Drain Improvement Plans—three(3)hard copies and a PDF copy; 90%Hydrology and Hydraulics Report—three(3)hard copies and a PDF copy; 90%Specifications—three(3) hard copies and a PDF copy; 90%Engineer's Construction Cost Estimate—three(3)hard copies and a PDF copy TASK 12:100%DESIGN SUBMITTAL PACKAGE(PS&E) Michael Baker will prepare a 100%Design Submittal Package for City approval which will include the proposed storm drain improvement plans, hydrology and hydraulics report,specifications,and engineer's estimate. One (1) plan set of storm drain improvement plans will be prepared for the project consisting of a title sheet,two (2) detail sheets, and thirteen (13) design sheets. The plans and all reference files will be prepared per the City's Computer Aided Design (CAD) Standards in a format compatible with the City's system. All project documents in digital/electronic format will be compatible with the City's computer applications(MS Office,Adobe Reader). One (1) hydrology and hydraulics report will be prepared which will include necessary hydrology delineations and calculations for the proposed storm drain system.The hydrology calculations shall be done in conformance with the Riverside County Flood Control and Water Conservation District Hydrology Manual. Michael Baker shall perform hydraulic calculations to support the design of the proposed storm drain facilities. Analysis of the storm drain hydraulic gradient shall be performed using the Los Angeles County "Water Surface Profile Gradient" (WSPGW) program. The design water surface generated shall be indicated on the profile drawings on the proposed design plans. Hydraulics will be performed for the 10- and 100- year storm events to ensure that the required flood protection is met in accordance with the Riverside County Hydrology Manual. One (1) set of specifications shall be prepared for the project in support of bidding, awarding contracts, and supervisions of the improvement to be constructed within the Project. Included are to be Instructions to Bidders, General Conditions,Special Provisions applicable to the specific job, Proposal Forms, and the Improvement Plans. One (1) Engineer's Construction Cost Estimate shall be prepared for the project based upon the storm drain improvement plans. Quantities shall be compiled using scaled measurements from the improvement plans. Consultant shall not be responsible for fluctuations in cost factors. Deliverables: 100%Storm Drain Improvement Plans—three(3)hard copies and a PDF copy; 100%Hydrology and Hydraulics Report—three(3)hard copies and a PDF copy; 100%Specifications—three(3)hard copies and a PDF copy; 100%Engineer's Construction Cost Estimate—three(3)hard copies and a PDF copy TASK 13:CVWD RELOCATION PLANS Michael Baker International shall prepare a revision to an existing CVWD plan(s)for relocation of up to two(2)water line crossing conflicts in accordance with the requirements of the Coachella Valley Water District (CVWD). This relocation will include the design of new siphons (or other realignment) of existing water lines within the project Michael Baker INTERNATIONAL Page 12 City of Palm Desert Line 4—Drainage Improvements—No.522-16 limits. The improvements will be designed in plan and profile,and will be submitted to CVWD for approval as a delta revision to the existing as-built plans on file. TASK 14: PARK INLET COORDINATION Michael Baker International shall work with the City to determine if the existing ADS pre-treatment system leading into the park site, prior to the underground chamber system is feasible with the proposed design or if a new pre- treatment system is a more reasonable alternative. It is unknown if the current system has the capacity to handle the flows from the proposed system. Michael Baker International shall communicate with two (2) other manufacturers/vendors which provide a similar product to the existing and determine if their respective product can be provided at a reasonable cost. Upon determination of salvaging the existing system, or constructing a new system,Michael Baker International shall prepare a delta revision to the existing Freedom Park Precise Grading Plan with the proposed device and appropriate information which coincides with the proposed Line 4 storm drain from Country Club. Michael Baker INTERNATIONAL Page 13 I Eli Eli MN ' . . ME . !ill 11111 11111111111 � PIM iint'iiii: � \ = /J - - II RIM 111111 HIH IlUl )k . f) - 7f H - NMI � I H 1 . H Hill ) � \ 11111 , .. . k§ : . .. Z2 UM � - 'k IM I � . -_i� ` IHli.ii � \ I ` �� " � ; ■ f � Cho ) k E � ) \ ) 0 A _ t _& k _ — -R E k J \ ƒ . f - 2 \ k {! - ii ! / ! a ^ ; . t ; , ! \ � • k #� � #� � { � ` " ` � ■ $ � § / Hil Jj \ ) \ /� ` ) ; } , U } flu2 7 w ; ! . - ) ) § ) ( f 1 Ln Rubino Ct — -------- A 7.�`.ar .,' - --...,,, . lif*prl• .Id Ct Batista Ct • . • Tudor Ln p. �T r O• r > rX o e v 'ClAi Bel Canto Ct Q` a W; .:'y: 0`_ a yr Freedom Park f - --1 E F i- Axxuro = 36"RCP 36"RCP it Club Or Cout]yv Fluh�r 24" f}��'� � 48 C,RCP RCP Sawgrass Cif +a,t 8 3 a V. p a 0 now T% eattuytot C.! Orymp a waY a F` C r O 6 3 2. • t. ,..5. 14, .,. S Y LI.„>4..., o . �� E r - !. ''` .,. . I 9 Ti r.: "...a r I Legend a s., 1 Proposed Storm Drain aismoi i . . Existing Storm Drain PALM DESERT LINE 4 Michael Baker 0 a 400 soo Pro ect A Proposed Facilities INTERNATIONAL Feet Source Figure 4-1 ra 18'+RCP n ,. Hdp 4,6 18"RCP �a c'` °+Q v S?9;MCA ,� . :c � 18"RCMP -P Palate Dr '� o` s" 48•RCP Castle CI n c'` Pia p��°t 18"RCP Beyvnra in E 0 Lancelot C1 18"RCP i L g. . •••... -::: '... • ,- ' . 1111:4481 --"i U r-. I ' liwil a s yl , rim gamma ' opit. I pas Legend 1 -- Proposed Storm Drain z wl rmm� L�� Existing Storm Drain r PALM DESERT LINE 4 Michael Baker 0 0 480 g6Feet Project B Proposed Facilities N=IIMTE RMATIEIMkL s°""° Figure 4-2 N 30"RCP • a U Ix 0 444 0 18" RCP 4164* 3 r.s I r.. "-" polo Legend Proposed Storm Drain R"mo� Existing Storm Drain PALM DESERT LINE 4 Michael Baker a 60 120 0Project C Proposed Facilities INTERNATIONAL Feet So�rcr Figure 4-3