HomeMy WebLinkAboutContracts & Agreements_103-2023FIRST AMENDMENT TO AGREEMENT TO PERFORM PROFESSIONAL SERVICES
This first amendment ("First Amendment") to the agreement for the provision of Redlands
Country Club Drainage Study dated February 21, 2023 ("Agreement"), by and between the City
of Redlands, a municipal corporation ("City"), and Watearth, Inc., a Texas Corporation
("Consultant"), is made and entered into this 20"' day of June, 2023.
RECITALS
WHEREAS, it is the desire of the City and Consultant to amend Article 2.1 of their existing
Agreement, specifically described in Exhibit "A," "Scope of Services" to include an amended
"Scope of Services," which is attached hereto by reference, and
WHEREAS, it is the desire of the City and Consultant to amend Article 4.1 of their existing
Agreement, specifically described in Exhibit "B," "Project Schedule" to include an amended
"Project Schedule," which is attached hereto by reference, and
WHEREAS, it is the desire of the City and Consultant to amend Article 5.1 of their existing
Agreement, specifically described in Exhibit "C," "Fee Schedule" to include an amended "Fee
Schedule," which is attached hereto by reference, and
WHEREAS, it is the desire of the City and Consultant to amend Article 4.2 of their existing
Agreement to extend contract until August 31, 2023, and
WHEREAS, it is the desire of the City and Consultant to amend Article 5.1 of their existing
Agreement to increase Consultant's present total compensation of sixty-seven thousand nine
hundred seventy-four dollars and fifty cents ($67,974.50) to the amount of eighty-nine thousand
five hundred three dollars ($89,503).
NOW, THEREFORE, City and Consultant agree as follows:
AGREEMENT
Section 1. The scope of work performed by Consultant pursuant to Exhibit "A" of the
Agreement, entitled "Scope of Services," is hereby amended and replaced by an amended Exhibit
"A", which is attached hereto and incorporated herein by this reference as Attachment 1.
Section 2. The project schedule set forth in Exhibit `B" of the Agreement, entitled
"Project Schedule," is hereby amended and replaced by an amended Exhibit `B", which is attached
hereto and incorporated herein by this reference as Attachment 2.
Section 3. The fee schedule set forth in Exhibit "C" of the Agreement, entitled "Fee
Schedule," is hereby amended and replaced by an amended Exhibit "C", which is attached hereto
and incorporated herein by this reference as Attachment 3.
Section 4. Subsection 4.2 of Article 4 of the Agreement, titled "Performance of
Services" is hereby amended to read as follows:
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"4.2 Consultant shall complete the Services by August 31, 2023, unless the Services are
terminated earlier as provided for herein."
Section 5. Subsection 5.1 of Article 5 of the Agreement, titled "Payments to
Consultant," is hereby amended to read as follows:
"5.1 Total compensation for Consultant's performance of the Services shall not exceed
the amount of eighty-nine thousand five hundred three dollars ($89,503). City shall pay Consultant
in accordance with Exhibit "C," titled "Fee Proposal," which is attached hereto and incorporated
herein by this reference."
Section 6. All other provisions of the Agreement shall remain unchanged by this First
Amendment and in effect.
IN WITNESS WHEREOF, the parties have executed this First Amendment, to be effective
as of June 20, 2023.
CITY OF REDLANDS
ATTEST:
e e Donaldson, City Clerk
WATEARTH, INC.
By: l .ti- .- W
1 ifer J. Walk, , President
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ATTACHMENT
EXHIBIT "A"
SCOPE OF SERVICES
Task 1— Research and Summary of Findings
a) Research and develop a timeline summary -of urbanization and hardscape
improvements that direct surface runoff onto the golf course.
Watearth will assess available information for the Redlands Country Club and Golf Course
(RCC). Watearth will supplement this information with aerial imagery depicting urbanization
over the history of the RCC. Will review the United States Geological Survey (USGS) maps
showing development history of the surrounding and hydrologically contributing area.
Watearth team has reviewed the Scope of Services document and will evaluate readily and
publicly available information that the City stores in their library room and other relevant
institutions. Additional desktop evaluation will be included for the following resources:
a. NRCS Soils Data
b. Topographic Data
c. Geotechnical Data
d. Flood Insurance Rate Map (FIRM)
e. Watershed boundaries and/or LIDAR
f. City of Redlands's as-builts of storm drainage, developments plans, and existing
H&H models
g. Other relevant studies, reports, and databases
The team has reviewed the Location Map with Discharge Locations and suggests performing
a site reconnaissance to identify additional site discharges into the Redlands Country Club
(RCC). Preliminary review of the site maps indicates that there are three main drainage areas
contributing to the golf course, measuring 36 acres, 43 acres, and 59 acres, with
approximately 14.2 acres located within the golf course. This subdivision is relevant for
modeling and to determine flood control responsibilities, and mitigation options locations.
Watearth will attend one virtual meeting with representatives of the City to gather historical
lalowledge of stormwater management practices associated with developments identified in
the data review. Information will be compiled and will be used to approximate the drainage
areas that will be part of the modeling process.
b) Develop separate pre -development and post -development drainage maps at various
urbanization milestone dates showing basins and sub -basins that direct surface runoff
onto the golf course. Each map should quantify the Q and tc for the minor and major
storm events, indicate discharge points, and highlight projects that redirected historic
flows.
Watearth will perform site reconnaissance focusing on contributing drainage areas to locate
any additional discharge points into the golf course and will complement it with an aerial
review to determine if any stormwater management feature such as detention ponds,
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retention areas, or low impact development (LID) features are creating a major restriction in
the stream(s) flowing through the golf course that may need to be included in the hydrology
model. These features will be shown in a pre- and post -development drainage map. Site
reconnaissance will be documented with photographs and field notes to be included in the
final report. Watearth plans to field assess and determine the drainage area from the golf
course draining into the three discharge points. This field data will be used to prepare a
drainage area map based on subdivision plans, records drawing or observation from the site
reconnaissance. Watearth assumes that survey data will be provided before the field
inspection is performed.
Watearth will employ the Hydrologic Modeling System (HEC-HMS) from the Hydrologic
Engineering Center (HEC) to accomplish the modeling portion of this project unless one of
the two "Optional Services" noted at the end of this scope is selected. This hydrology
analysis will include 3 to 5 sub -basins per discharge point and hydrologic routing between
basins. GIS will be used to delineate drainage areas.
Watearth will run the model for the following design storm events: 1-year, 2-year, 10-year,
25-year, 50-year, and 100-year for up to three milestone dates for each discharge point. The
hydrologic analysis will follow the County of San Bernardino Hydrology Manual and will
calculate the flow at the discharge points and the time of concentration (Tc), also called
"critical duration", as defined by the manual. The model will be used to develop map exhibits
that illustrate a history of projects that have redirected flows into the golf course.
c) Review public and private development projects at the various urbanization milestone
dates to determine if they met flood control standards in effect at that time.
Watearth team will contact San Bernardino County Public Works, Flood Control Engineering
Division to obtain plans and specifications of flood control improvements to set the
milestone dates necessary to determine if local urbanization met historical flood control
standards. Will also request access to record drawings (as-builts) and topographic maps. If
not available, Watearth will estimate whether historical standards were likely to have been
met.
d) Summarize the findings in simple terms that identify any existing stormwater-related
CEQA violations, quantify the City's current flood control responsibility in terms of Q
for each discharge point (i.e., what reduction in Q would be necessary at each location),
whether or not urbanization complied with adopted standards at each milestone date,
and the cumulative impacts of urbanization runoff if standards were not met.
Watearth will assess the modeling results to identify existing stormwater-related CEQA
violations by comparing the peals flow and/or runoff volume at each milestone date.
Furthermore, comparing the baseline and milestone hydrographs to assess changes in timing
in addition to the above. After setting the milestone dates in Task I.e, Watearth will
determine the City's current flood control responsibility in terms of excess urban flow
volume for each discharge point. Our team will discuss the excess urban runoff volume
(EURV), which is the difference between the developed and pre -developed runoff volume
for the range of storms that produce runoff from pervious land surfaces. Additionally,
Watearth will calculate the runoff volume contributed by the golf course and compare this
result with the offsite runoff production; the latter will be used to confirm the City's current
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flood control responsibilities in term of flow. As part of the cumulative impacts of
urbanization runoff, the team will discuss the impacts in terms of hydromodification by
reviewing the hydrographs and determining if either peak flows or runoff volumes (which
could be contributing to the erosion) were increased at various milestones. An inundation
map in the RCC is an additional service.
Task 2: Development of a Technical Memorandum
a) A technical memorandum with up to three (3) mitigation concepts for each discharge
point that will reduce the Q to pre -development rates.
Watearth will propose up to three mitigation concepts to 10% level for each discharge point
based on the results obtained in Task 1. There are a several possibilities for on -site mitigation
at the golf course, if allowed, or off -site within the unnamed adjacent creek, or elsewhere in
the watershed on City or public land that Watearth has successfully employed in past similar
projects. Watearth will attend up to one meeting with the City to discuss preferred
alternatives at a high level before proceeding with mitigation concept development. Solutions
may include stream mitigation, erosion control at the outfall, detention storage within the
watershed, or low impact development (LID) with hydromodification controls within the
watershed. If additional future resiliency is desired, the concept designs will include a multi -
benefit project concept, provided space for implementation is identified. This task will
include coordination directly with RCC operations and facilities managers to best understand
their goals.
b) A conceptual cost estimate for each of these mitigation concepts.
Watearth will prepare a conceptual cost estimate for the mitigation concepts (Task 2a).
Assumptions
1. Watearth will attend up to 3 in person or virtual meetings during the project.
2. Watearth will address up to 1 round of deconflicted and consolidated comments by the
City on each deliverable.
3. Task la and 1 c will be performed up to the hours budgeted.
Optional Services
1. 1D modeling using XP-SWMM for hydraulic analysis. This hydraulic model would
provide hydraulic results such as velocity, flow and HGL for each link, and potential
volume of water spilled out at the node.
2. 2D modeling using XP-SWMM for hydraulic analysis. This hydraulic model would
provide a broader result in terms of overland flood limit results in the urban area and
country club area. This model utilizes a 2D mesh that will connect the 1D storm drainage
system and the surrounding surface area.
3, Inundation maps. As part of the cumulative impact assessment due to urbanization,
Watearth advises identifying impacts in inundation maps at various stages of
urbanization, which will require modeling of a portion of the golf course as storage
routing following the 14EC-HMS methodology.
4. Survey Data. As part field verification and modeling purpose, survey data is relevant and
important part of the study. Watearth will include a survey data appropriate to comply
with the study's goals.
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Task 3: Research and Summary of Findings for Additional 4 Discharge Points
Task 3a - Site visit and summary of additional 4 discharge points to be included in the
Task 2 Technical Memorandum.
Task 3b - Perform HEC-HMS modeling of stormwater runoff for the 4 additional
discharge points to quantify Q and tc values to be incorporated into Task 1b. Pre- and
post -development drainage area maps.
Tack 3c - Analysis of additional 4 discharge points and their relation to flood control
standards and potential CEQA violations from the milestone years chosen for the
project. This analysis will be included in tasks 1c and 1d and a brief memorandum.
Task 4: Development of a Technical Memorandum Incorporating the 4
Additional Discharge Points
Task 4a - Develop up to 3 mitigation concepts per additional discharge point to be
included in the Drainage Study Technical Memorandum.
Task 4b - Provide a conceptual cost estimate for each mitigation concept related to the
additional 4 discharge points to be included in the Drainage Study Technical
Memorandum.
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Contract NTP:
ATTACHMENT
EXHIBIT `B"
PROJECT SCHEDULE
2/23/2023
Timeline Summary
On Track
3/1/2023
31
[{FY of-Redlandsfieulew Tmaeline SummSty�
=Dn Track
''4/1/2023
= ]
Develop Separate Pre-Developmentand Post -Development Dralnage Maps
On Track
4/1/2023
65
CityoP Redlands fteylarti Develop Sepa[e4,�P[e Development and Pose-
'-On
Hs/2023
Y
Development DramageiMaps
Track
"
Review Public and Private Development Projects
On Track
5/1/2023
40
Cost Estimates On Track 6/30/2023 36
Site visit and summary of add Moral 4 discharge points to be I nd hided in the Task
On Track 5/1/2023 15
2Technlcal Memorandum.
Perf.6HEDHMSmody lmg of st rmwaterru6Mf far the 4 additional di sctlafge
pmptftoquonbfytlandtcvaluestoba-Igcorpdrated mto Task lb Pre-and.,y"ost On
development drainage area maps
Analysis of additional discharge points and their relation to flood control
standards and potential CEQA violations from the mllestone years chosen forthe On Track 5/16/20B 25
project. This analysis will be included In tasks lc and ld and a brief
memorandum.
iio D, velq�.Techmcaf Nfiel inauml G tlll4lbe4 Ad r
Dlsesrge pmnt` _ 'TM _ - s -
Develop upto3mitigation concepts peradditional discharge pointtobe included On Track 6/12/2023 54
In the Drainage Study Technical Memorandum.
City of Redlands Review: Draft Tech Memo(3 Concepts) On Track 8/5/2023 ]
Final Toch Memo (3Concepts) On=Track 8/12/2023„ - 21
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ATTACHMENT
EXHIBIT G°C"
FEESCHEDULE
task 1: Research and Summary of Findings
°
Research antl develop a fimellne summaryof urbanization and horoscope
iarlanwimI that direct surface runoff onto the golf course
1.0
0.0
0.0
8.0
2.0
6.0
20.0
12.0
49.0
$ 2,139.00
14.3%
b
Develop separate pre -development and post -development drainage
maps at various urbanization milestone dates showing basins and sub-
basins that direct surface runoff onto the golf course. Each map should
quantify the Q and to for the minor and major storm events, indicate
discharge paints, and highlight protects that reelected historic flows
2.0
1.0
0.0
32.0
2,0
4.0
70.0
36.0
147.0
$ 21,233.00
42.5%
c
Review public and private development projects at the various
urbanization milestone have to determine If they met flood control
standards in effect at that time
1.0
0,0
0.0
12.0
2.0
6.0
38,0
12.0
71.0
$ 10,20900
20.4%
d
Summarize the findings In simple terms that identify any existing
stormwater+elated CEQA violations, quantity the City's current flood
control responsibllltyin terms of Q for each discharge point i.e.. what
reduction In Q would be necessary of each location), whether or not
urbanization complied with adopted standards at each milestone date,
and the cumulative impacts of urbanization runoff if standards were not
met
1.0
2,0
6.0
4.0
2.0
4.0
44.0
120
75.0
$ 11,359.00
22J%
Subtotal Task 1
5.0
3.0
6.0
56.0
8.0
20,0
172.0
1 720
342.0
$ 49,940.00
73.5%
Task 2: Development of a Technical Memorandum
a
A technical memorandum with up to three 13) mitigation concepts for
each discharge point that will reduce the Q to re -development rates
2.0
20
6.0
6.0
2.0
4.0
280
16.0
66.0
$ 10,35800
58.3%
b
A conceptual Cost estimate for each of these mitigation concepts
1.0
3.0
12.0
2.0
4.0
2.0
16.0
0.0
40.0
$ 7AI,I.00
41. %
Sublolal Task
3.0
5.0
18.0
3.0
6.0
6.0
44.0
16.0
106.0
$ V,]]2.00
26.1%
Subtotal All Tasks
8.0
8.0
240
64.0
14.0
26.0
216.0
88.0
448A
$ 6I,212.00
E enses
Mileage (3 trips ® 140 m1 RT ® $0.62.5/mi)
$ 262.50
Subtotal Expenses
$ 262.50
Overall Total
$ 62,9]4.50
Task 3: Research and Summary of Findings far Additional 4 Discharge Points
a
Site visit and summary of additional discharge points to be included in
the Task 2 Technical Memorandum.
0.0
0.0
0.0
0.0
0.0
1.0
8.0
10
10.0
$ 1,355.00
12.8%
Is
Perform HEC-HMS modeling of stormwater runoff for the 4 additional
discharge points to quantify Q and tc values to be incorporated Into Task
lb,Pre-and posndevelopment drainage area maps.
1.0
1.0
0.0
10,0
1.0
2.0
20.0
15.0
50.0
$ 7,349.00
69.2%
°
Analysis of additional 4 discharge points and their relation to any potential
CEQA violations from the milestone years chosen for the project. This
analysis will be included in tasks I and 1d and a brief memorandum.
1.0
0.0
0.0
2.0
1,0
2.0
5,0
1.0
12.0
$ 1 T909.00
18.01%
Subtotal of Task 3
20
1.0
0.0
12.0
2.0
5.0
33.0
17.0
72.0
$ IUI3.00
49.3%
Task 4: Development of a Technical Memorandum Incorporating the 4 Addition al Discharge
Polnts
°
Develop up to 3 mitigation concepts per additional discharge point Io be
included In the Drainage Study Technical Memorandum.
1.0
0.0
20
8.0
1.0
2.0
20.0
10
35.0
$ 5.364.00
25.0%
b
Provide a conceptual cost estimate for each mitigation concept related
to the additional 4 discharge points to be included into the Drainage
Study Technical Memorandum.
10
0.0
3.0
8.0
1.0
Ed
20.0
0.0
35.0
$ 5,464.00
25.5%
Subtotal Task
2.0
0.0
5.0
16.0
2.0
4.0
400
1.0
70.0
$ 10,82800
60.3%
Subtotal All Tasks
4.0
1.0
50
28.0
4.0
90
73.0
18.0
142.0
$ 21,441.00
Expenses
Mileage I I taps 6 140 at RT 4 $0.62.5/mi)
$ 87.50
Subtotal Expenses
$ BZ50
Overall Total
$ 21,528.50
GRAND TOTAL (NOT -TO -EXCEED)
$89,503.00
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