ITEM 4. 17
CITY MANAGER' S REPORT
APRIL 14, 2025 CITY COUNCIL REGULAR MEETING
ITEM: APPROVE CONTRACT AMENDMENT WITH CAROLLO
ENGINEERS, INC. FOR THE EAST LATHROP
STORMWATER MASTER PLAN, CIP SD 25- 17
RECOMMENDATION: Adopt Resolution to Approve Contract Amendment No. 1 with Carollo Engineers, Inc. for the East
Lathrop Water Stormwater Master Plan, CIP SD 25-
17 SUMMARY:
Capital Improvement Project ( CIP) SD 25- 17 East Lathrop Stormwater Master Plan ELSMP) was created to provide a framework to guide storm drainage infrastructure improvements, regulatory compliance, support utility operations, budget, rate studies, land use planning and development fees. The City has applied for and received Regional Early Action Planning ( REAP 2.0) grant funding in the amount of 671, 983 to complete the ELSMP. On January 13, 2025, Council approved the creation of CIP SD 25- 17, East Lathrop Stormwater Master Plan, ratification of an agreement with Carollo Engineers, Inc. (Carollo) and approved a budget amendment.
Staff is requesting approval of an amendment to the agreement with Carollo to eliminate the Stonebridge development area from the ELSMP and add an evaluation of the aging San Joaquin River storm drain pump station to determine if it could be decommissioned by sending its flows to the Mossdale M2 storm drain pump station instead. Staff requests that City Council approve Contract Amendment No. 1 with Carollo in the amount of $ 188, 400 for additional engineering consulting services for the ELSMP, CIP SD 25- 17.
BACKGROUND:
One of the major constraints that hinders development in East Lathrop is the availability to utilize efficient stormwater management facilities. The ELSMP will provide a framework for the development of stormwater facilities in East Lathrop to allow potential development to occur with this area of Lathrop. Currently, developments are responsible for managing stormwater on -site reducing the availability of land for development.
On April 8, 2024, the City Council authorized participation and allocation of funding for the REAP 2. 0 Grant Program Funds through the San Joaquin Council of Governments for the ELSMP for an estimated allocation in amount of $ 714, 116. In September 2024, an Agreement was executed with the San Joaquin Council of Governments for a REAP 2. 0 grant funding in the amount of $ 671, 983 to complete the ELSMP.
CITY MANAGER' S REPORT PAGE 2
APRIL 14, 2025, CITY COUNCIL REGULAR MEETING
APPROVE CONTRACT AMENDMENT WITH CAROLLO ENGINEERS, INC. FOR THE EAST LATHROP STORMWATER MASTER PLAN, CIP SD 25- 17
On October 16, 2024, staff issued a Request for Proposals for engineering consulting services and Carollo was selected as the best qualified firm to complete the ELSMP based on their previous work history, qualifications, positive references, and overall understanding of the project requirements. Due to time constraints by the grant conditions requiring completion of the project by the end of this year, the agreement with Carollo was executed by the City Manager so work could commence without delay.
On January 13, 2025, Council approved the creation of CIP SD 25- 17 East Lathrop Stormwater Master Plan, ratification of the agreement with Carollo and approved a budget amendment transferring the funds from the REAP 2. 0 Grant into the newly created CIP SD 25- 17.
The City is working with SJCOG to amend the REAP 2. 0 grant agreement to allow a change in scope with Carollo to evaluate if the San Joaquin River storm drain pump station can be decommissioned by sending its flows to the nearby Mossdale M2 storm drain pump station.
REASON FOR RECOMMENDATION:
CIP SD 25- 17 East Lathrop Stormwater Master Plan is needed to provide a framework to guide storm drainage infrastructure improvements, regulatory compliance, support utility operations, budget, rate studies, land use planning and development fees.
Approval of a contract amendment to the agreement with Carollo is recommended to eliminate the Stonebridge development area from the ELSMP study area and add an evaluation if the aging San Joaquin River storm drain pump station could be decommissioned and send its flows to the Mossdale M2 storm drain pump station instead. Staff request that City Council approve Contract Amendment No. 1 with Carollo in the amount of $ 188, 400 for engineering consulting services for the ELSMP, CIP SD 25- 17.
FISCAL IMPACT:
The cost of the Contract Amendment No. 1 with Carollo for CIP SD 25- 17 East Lathrop Stormwater Master Plan is $ 188, 400 and sufficient funds are included by the REAP
2. 0 Grant Program to cover these costs.
ATTACHMENTS:
A. Resolution to Approve Contract Amendment No. 1 with Carollo Engineers, Inc. for the East Lathrop Water Stormwater Master Plan, CIP SD 25- 17 B. Contract Amendment No. 1 with Carollo Engineers, Inc. for the East Lathrop Stormwater Master Plan, CIP SD 25- 17
CITY MANAGER' SREPORT PAGE 3
APRIL 14, 2025, CITY COUNCIL REGULAR MEETING
APPROVE CONTRACT AMENDMENT WITH CAROLLO ENGINEERS, INC. FOR THE EAST LATHROP STORMWATER MASTER PLAN, CIP SD 25- 17
APPROVALS
t
Greg Gibson Date
Senior Civil Engineer
Bra Taylor
City Engineer
Cari Jam - s
Finance Di hector
01/ 5/ A92-- s
Date
3/ v717/ 0-7s
Date
3h/ e. zoas
3.2?• zozs
Michael King Date
Assistant City Manager
Salvador Navarrete Date
City Attorney
Ste en J. Salvatore Date
City Manager
x{• 2.5
RESOLUTION NO. 25 -
A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF LATHROP TO APPROVE CONTRACT AMENDMENT NO. 1 WITH CAROLLO ENGINEERS, INC.
FOR THE EAST LATHROP WATER STORMWATER MASTER PLAN, CIP SD 25- 17 WHEREAS, Capital Improvement Project ( CIP) SD 25- 17 East Lathrop Stormwater Master Plan was created to provide a framework to guide storm drainage infrastructure improvements, regulatory compliance, support utility operations, budget, rate studies, land use planning and development fees; and WHEREAS, on April 8, 2024, the City Council authorized participation and allocation of funding for the Regional Early Action Planning ( REAP 2.0) Grant Program Funds through the San Joaquin Council of Governments for the East Lathrop Stormwater Master Plan ( ELSMP) for an estimated allocation in amount of $ 714, 116; and
WHEREAS, in September 2024, an Agreement was executed with the San Joaquin Council of Governments for a REAP 2. 0 grant funding in the amount of 671, 983 to complete the ELSMP; and
WHEREAS, on January 13, 2025, Council approved the creation of CIP SD 25- 17, East Lathrop Stormwater Master Plan, ratification of an agreement with Carollo and approved a budget amendment; and
WHEREAS, approval of a contract amendment to the agreement with Carollo is recommended to eliminate the Stonebridge development area from the ELSMP and add an evaluation if the aging San Joaquin River storm drain pump station could be decommissioned and send its flows to the nearby Mossdale M2 storm drain pump station instead; and
WHEREAS, staff request that City Council approve Contract Amendment No. 1 to the Professional Services Agreement with Carollo Engineers, Inc., in the amount of $ 188, 400 for additional engineering consulting services for the ELSMP, CIP SD 25- 17; and
WHEREAS, The cost of the Contract Amendment No. 1 with Carollo for CIP SD 25- 17 East Lathrop Stormwater Master Plan is $ 188, 400 and sufficient funds are included by the REAP 2. 0 Grant Program to cover these costs.
NOW, THEREFORE, BE IT RESOLVED, that the City Council of the City of Lathrop does hereby approve Contract Amendment No. 1 to the Professional Services Agreement with Carollo Engineers, Inc., in the amount of $ 188, 400 for additional engineering consulting services for the ELSMP, CIP SD 25- 17.
The foregoing resolution was passed and adopted this 14th day of April, 2025, by the following vote of the City Council, to wit:
AYES:
NOES:
ABSENT:
ABSTAIN:
Paul Akinjo, Mayor
ATTEST: APPROVED AS TO FORM:
Teresa Vargas, City Clerk Salvador Navarrete, City Attorney
ATTACHMENT
g ..
AMENDMENT NO. 1
TO THE AGREEMENT BETWEEN THE CITY OF LATHROP AND
CAROLLO ENGINEERS, INC. DATED DECEMBER 23, 2024
TO PROVIDE PROFESSIONAL ENGINEERING CONSULTING SERVICES FOR THE EAST LATHROP STORMWATER MASTER PLAN, CIP SD 25- 17
THIS CONTRACT AMENDMENT ( hereinafter " AMENDMENT NO. 1") to the agreement between Carollo Engineers, Inc. and the City of Lathrop dated December 23, 2024, (hereinafter "AGREEMENT") dated for convenience this 14th day of April 2025, is by and between the City of Lathrop, a California municipal corporation (" CITY") and Carollo Engineers, Inc. ("CONSULTANT");
RECITALS:
WHEREAS, CONSULTANT is specially trained, experienced, and competent to Professional Engineering Consulting Services, which are required by this agreement; and WHEREAS, CITY selected the CONSULTANT pursuant to said qualifications; and WHEREAS, on December 23, 2024, CONSULTANT and CITY entered into an AGREEMENT to provide Professional Engineering Consulting Services for the East Lathrop Storm Water Master Plan, CIP SD 25- 17, in the amount of $468, 600; and WHEREAS, on January 13, 2025, by Resolution No. 25- 5714, City Council ratified City Manager' sapproval of the Professional Services Agreement dated December 23, 2024 for the East Lathrop Storm Water Master Plan, CIP SD 25- 17, in the amount of 468, 600; and
WHEREAS, CONSULTANT has provided CITY with a scope of work attached hereto as Exhibit " A" for Amendment No. 1 to provide additional Professional Engineering Consulting Services in support to the East Lathrop Storm Water Master Plan, CIP SD 25- 17; and
WHEREAS, CONSULTANT is willing to render such Professional Engineering Consulting Services, as hereinafter defined, on the following terms and conditions.
NOW, THEREFORE, CONSULTANT and the CITY agree as follows:
AMENDMENT NO. 1 TO AGREEMENT
1) Scope of Service. Section (1) of the AGREEMENT is hereby amended to add the following:
CITY OF LATHROP - CAROLLO ENGINEERS, INC.
AMENDMENT NO. 1 FOR THE EAST LATHROP STORMWATER MASTER PLAN, CIP SD 25- 17 CONSULTANT agrees to perform Professional Engineering Consulting Services in accordance with the scope of work and fee proposal provided by CONSULTANT, attached hereto as Exhibit " A" in addition to the scope of work in the original AGREEMENT dated December 23, 2024. CONSULTANT agrees to diligently perform these services in accordance with the upmost standards of its profession and to CITY' Ssatisfaction.
2) Compensation. Section ( 2) of the AGREEMENT for Consulting Services is hereby amended as follows:
City hereby agrees to pay CONSULTANT an additional cost of $188, 400 for the services set forth in Exhibit " A" of this AMENDMENT NO. 1, with a total sum not to exceed of $ 657, 000 ($468, 600 for the original AGREEMENT and $ 188, 400 for AMENDMENT NO. 1). CONSULTANT shall be paid within thirty ( 30) days of receipt of billings containing all information contained in Paragraph 5 of the original AGREEMENT. Compensation for any task must be equal to or less than the percentage of task complete. In no event shall CONSULTANT be entitled to compensation for work not included in the original scope of work and this AMENDMENT unless a written change order or authorization describing the extra work and payment terms has been executed by CITY' SAuthorized Representative prior to the commencement of the work.
3) Effective Date and Term
The effective date of AMENDMENT NO. 1 is April 14, 2025, and it shall terminate no later than June 30, 2026. All other terms of the original AGREEMENT shall remain in full force and effect.
4) Applicability to Original Consultant AGREEMENT
All terms and conditions set forth in the AGREEMENT dated December 23, 2024 are still in effect and are incorporated by reference herein and said AGREEMENT is incorporated by reference herein.
5) Signatures
The individuals executing this AMENDMENT NO. 1 represent and warrant that they have the right, power, legal capacity, and authority to enter into and to execute this AMENDMENT NO. 1 on behalf of the respective legal entities of the CONSULTANT and the CITY. This agreement shall inure to the benefit of and be binding upon the parties hereto and their respective successors and assigns.
CITY OF LATHROP - CAROLLO ENGINEERS, INC.
AMENDMENT NO. 1 FOR THE EAST LATHROP STORMWATER MASTER PLAN, CIP SD 25- 17 Approved as to Form:
Recommended for Approval:
Approved by:
Resolution No. 25 -
Consultant:
City of Lathrop
City Attorney
Salvador Navarrete
3. Z?- 7jz- 5—
Date
City of Lathrop
Assistant City Manager
Michael King Date
City of Lathrop
390 Towne Centre Drive
Lathrop, CA 95330
Stephen J. Salvatore Date
City Manager
Carollo Engineers, Inc.
2880 Gateway Oaks Drive, Suite 300
Sacramento, CA 95833
Fed ID # 86- 0899222
Business License # NLB- 000545- 225
Signature Date
Print Name and Title
Signature Date
Print Name and Title
EXHIBIT " R
SCOPE OF SERVICES
AMENDMENT 1
CITY OF LATHROP
AND
CAROLLO ENGINEERS, INC.
EAST LATHROP STORMWATER MASTER PLAN
CIP # SD 25- 17
BACKGROUND
During the kick- off meeting for the project, several items were identified that were not included in the original scope of work, but would advance the project goals. These items include:
evaluation of an alternative outfall for the project area (referred to as the Mossdale system),
removal of developing proposed solutions for the Stonebridge area, and funding research for implementation of this plans proposed solutions.
These items apply to multiple tasks in the original scope of work. As such, a summary of their
impact to the applicable tasks is described below.
Alternative Outfall Analysis ( Mossdale System)
The East Lathrop project area currently discharges through the San Joaquin River Pump Station. This pump station is reaching the end of its useful life. The forcemain to the lift station crosses the Mossdale System gravity outfall. The City' s understanding of the Mossdale gravity outfall is that it has excess capacity. The City wishes to explore if the East Lathrop area could discharge into the Mossdale System and decommission the San Joaquin River Pump Station.
To understand this, the Mossdale System needs to be evaluated in a similar manner as the East Lathrop area. Additionally, the East Lathrop area needs to be connected to the Mossdale discharge to ascertain if this is a workable option.
The following additions to the current tasks are proposed for this evaluation:
TASK 2 - System Inventory and GIS Database Development
The additional data collection and system inventory for this area will be conducted. Where necessary, survey and CCTV will be carried out for the model development and system condition assessment. Additionally, the GIS database created for the project will be updated to include this area.
TASK 3: Identify Basins, Develop Models, & Evaluate Existing Hydraulic Capacity The Mossdale System will be included in the hydrologic and hydraulic model developed for the project. Drainage basins will be delineated. Hydrologic parameters will be calculated. The hydraulic model for the area will be developed. Once completed, the current flows and excess capacity of the system will be determined.
This will be documented in the Technical Memorandum being developed for this task.
March 2025 Page 1 of 3
TASK 4: Capital Improvements
The East Lathrop area will be disconnected from the San Joaquin River lift station force main and connected to the Mossdale System gravity main. The hydraulic impacts of this modification will be evaluated. Specifically, increases in flood depths upstream or downstream of the connection will be summarized.
A high level condition assessment will be conducted for the San Joaquin River lift station. A planning level cost estimate to refurbish the lift station will be developed. This will then be compared to the cost to connect the East Lathrop area into the Mossdale System.
Removal of Proposed Recommendations for Stonebridge Area The Stonebridge Area was developed after the East Lathrop area. More conservative stormwater design standards were utilized for that development. As such, that area is not subject to the level of flood risk of the East Lathrop Area. Additionally, due to it' s age, infill development in this area is not as likely.
TASK 4: Capital Improvements
Proposed recommendations will not be developed for the Stonebridge Area and will be removed from the Fee Estimate for the project.
TASK 3: Identify Basins, Develop Models, & Evaluate Existing Hydraulic Capacity The existing Stonebridge Area will still be included in the hydrologic and hydraulic model. This is because, due to the flat topography of the project area, floodwaters from both Stonebridge and East Lathrop could interact with each other. There is no change to this task with respect to the Stonebridge Area.
Plan Implementation Funding Research
The Stormwater Master Plan will result in a list of recommendations to help the City meet its stormwater management targets and the targets of the REAP 2. 0 grant funding this project.
TASK 4: Capital Improvements
The City has limited stormwater management funding. As such, this additional effort will research available funding options including grants, low -interest loans, stormwater utility development, and ballot measures. Options will be described based on their effort to obtain and how they align with each of the proposed recommendations.
TASK 1 — Project Management and Quality Control
Additional project management effort to track and deliver the additional items will be conducted in a similar manner as described in the original scope of work.
TASK 5: East Lathrop Stormwater Master Plan Report
The methodology and results of this analysis will be included in the Master Plan Report for the project.
March 2025 Page 2 of 3
Fee
Estimate,
Amendment
Additional 1
Estimated
Fee
East
Lathrop
Stormwater
Master
Plan ,
CIP#
SD
25- 17
City
of
Lathrop
Task Description
Task
1 -
Pro
ect
Mana. ement
and
Qualit
Control
Charge in -Principal -
10 o
Advisor Technical
10 8
Hours
by
Classification CCTV o
Review Data
o
2 7,
o
0 L.
co
3 a
Labor
0 0
0 28
S
7. 800
Task
1. Project
Administration
and
Schedule
0 0
0 0
0 0
0 0
0 0
I
ask
7. zworkshops
v
v
v
v
v
v
s,
Task
1.3 Project
Meetings
0 10
0 10
8 0
0 0
0 28
7, 800 $
Task
41. Quality
Control
0 0
0 0
0 0
0 0
0 0
Task
2:
System
Inventory &
GIS
Database
Development
0 0
16 0
16 0
0 22
0 54
12900
Task
2. 1
Data
Collection
and
System
Inventory
0 0
4 0
8 0
0 6
0 18
4, 200 $
Task
2. Survey
0 0
4 0
0 0
0 0
0 4
400 $ 1,
Task
2. 3
CCTV
Inspection
of
City
Pipelines
0 0
4 0
0 0
0 0
0 4
1, 400 $
Task
2. 4
Condition
Assessment
Technical
Memorandum
0 0
0 0
0 0
0 0
0 0
Task
2. 5
GIS
Database
Updates
0 0
4 0
8 0
0 16
0 28
5, 900 $
Task
3:
Identify
Basins,
Develop
Models, &
Evaluate
Existing
Hydraulic
Capacity
0 10
6 58
72 0
0 0
4 150
S
37. 900
3. Task
1 Basin/ Hydrologic
Parameter
Development
0 4
0 28
30 0
0 0
0 62
15, 700 $
3. Task
2Hydraulic
Model Development
0 2
0 20
26 0
0 0
0 48
11, 900 $
Task
3. Hydraulic
Model
Validation
0 2
2 8
8 0
0 0
0 20
300 $ 5,
Task
3. 4
Monitorin
Flow
g
Program
0 0
0 0
0 0
0 0
0 0
Task
3. 5
Hydraulic
Model
Calibration
0 2
4 2
4 0
0 0
4 16
4, 100 $
Tack
1 ClimaR
te hannr1 Anae
lvcic
0 0
0 0
0 0
0 0
0 0
3. Task
7 System
Evaluation
of
City
Infrastructure
Task
3. 8
Hydraulic
Model
Development
and
Evaluation
Technical
Memorandum
0 0
0 0
0 0
0 0 6
14 14
152
132
0 49
10 15
392 $
500 $ 12.
0 0
0 4
0 0
0 0
0 $
0 0
4 $
900 $
Task
4:
Im
Ca. ital
provements
Task
4. 1
Develop
Recommended
Improvements
Task
4. 2
Preliminary
Engineering
for Recommended
Alternatives
Task
4. 3
Develop
CIP
Task
4. CIP
Technical
Memorandum
Task
Inv4. 5
estigate
CIP
Funding
Options
Task
4. 6
High
Level
PS
Field
Assessment
0 0
2 2
26 0
0 2
2 22
0 0
2 8
24 0
0 0
6 12
2 4
4 64
48 4
10 4
70 0
0 10
0 20
28 0
0 0
0 58
S
15. 000
Task
5:
East
Lathrop
Stormwater
Master
Plan
Report
5. Task
1 East StormwLathrop
ater
Master
Plan
Report
0 0
0 0
30 0
0 0
0 26
0 1
0 0
35 0
0 2
3 23
0 48
8 12
190
0 0
0 0
88 100 $ 7, 200 $ 6, 8, 600 $ 100 $ 5, 300 $ 50, 25,00 $ 0 10
20 28
0 0
58 15, 000 $
Total
Hours
and
Fee
6 44
36 240
256
0 49
32 19
682
176,00 $
Notes 1)
Other expedirect
nses mileinclude
age
travelling
to/
ho
rnmeetings
at
IRS
Federal
Rate,
reproduction
at
cost
plus
5%,
and
Project
Equipment
andCommunication
Expense
billed
at $
15. 00
per
hour.
2) Subconsultant
costs
include
5%
markup
March
2025
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