HomeMy WebLinkAboutAGRMT NO KRGSA18-002KRGSA 18-002
May 3, 2018
Jeff Siemens, President
Olcese Water District
15701 Hwy. 178
Bakersfield, CA 93306
Re: Reimbursement Agreement
Dear Mr. Siemens:
KERN RIVER GSA
Rodney J. Palla, Chair
Bob Smith
Gene Lundquist
The Kern River Groundwater Sustainability Agency (Kern River GSA) retained Todd Groundwater
to update the Department of Water Resources' C2VSim Model and, using such updated Model,
to provide a current and historical water budget for the entire Kern County Sub -basin (Model
Update Project). The Model Update Project is more particularly described in the attached "draft
proposal" dated January 17, 2017 (Attachment 1). The Olcese Water District (OWD) agreed to
participate in the Model Update Project and share costs with Kern River GSA based on acreage.
Therefore, the Kern River GSA and OWD agree on the following terms and conditions:
I. Each participant signing below will pay its share of the initial proposed budget of
approximately $432,000 per the attached fable (Attachment 2) for the Model Update
Project.
2. All payments shall be due 45 days after receipt of an invoice from the City of Bakersfield
(acting as fiscal agent for the Kern River GSA).
3. It is understood that the proposed budget is an estimate only. If costs for the Model
Update Project increase more than ten (10) percent over the proposed budget, the
increase must be approved by OWD. Costs above the initial proposed budget will be
paid in the some percentages in the attached fable, unless otherwise agreed.
4. Costs will be reconciled at the end of the Model Update Project and refunds or
additional payments will be due 45 days after the final accounting.
If the above terms and conditions are acceptable, please sign and date all copies of this
reimbursement agreement and return them to the Kern River GSA. A fully executed original will
be returned 1 e D.
Since Accepted:
Olcese Water District
Rodney Palla
Chairman
By: w✓
Title:
Date: 5/lilholt
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ORIGINAL
ATTACHMENT 1
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TODD=
GROUNDWATER
January 17, 2017
DRAFT PROPOSAL
To: Kern River Groundwater Sustainability Agency
From: Phyllis Stanin, PG, CHG, Vice President / Principal Geologist
Mike Maley, PG, CHG, Senior Hydrogeologist / Groundwater Modeler
Re: Update to Scope of Work dated May 9, 2016
Kern County Subbasin-Wide Water Budget Modeling with C2VSim
Groundwater Sustainability Plan (GSP)
Kern River Groundwater Sustainability Agency (KRGSA)
As outlined in the Scope of Work dated May 9, 2016, Todd Groundwater is preparing a
Groundwater Sustainability Plan (GSP) for the Kern River Groundwater Sustainability Agency
(GSA). In compliance with GSP regulations, Todd Groundwater proposed an approach for
developing a current and historical water budget analysis using a regional groundwater model
developed by the Department of Water Resources (DWR), referred to as C2VSim'. That
approach focused on revising the C2VSim model with local KRGSA data only; this proposal
expands the original approach to improve the model throughout the Kern County Subbasin
and, to that extent, is intended to modify and update the previous Scope of Work.
GSP regulations require that the water budget analysis be conducted on a basin -wide basis,
requiring the model to be applied over the entire 3,000 square miles of the Kern County
Groundwater Subbasin' (5-22.14). In addition to the detailed analysis of local water budgets
previously proposed for the KRGSA, GSP regulations also require one water budget for the
entire subbasin. Recent developments suggest that the updated C2VSim model may contain
local inaccuracies throughout the subbasin. This scope of work addresses revisions to the
C2VSim model to address these inaccuracies.
Key inaccuracies are: (1) DWR has indicated that detailed banking recharge and recovery data
have not been adequately included in the current C2VSim update; (2) recent remote sensing
analyses in the Kern County Subbasin have produced revised evapotranspiration data and
' C2VSim refers to the California Central Valley Simulation Model developed by DWR using their
modeling code Integrated Water Flow Model (IW FM). C2VSim is a regional model covering the entire
California Central Valley and is being updated by DWR for application to GSP water budget analyses.
' GSP regulations define "Basin" as a groundwater basin or subbasin identified and defined in Bulletin
118 or as modified pursuant to Water Code 10722 et seq. For this proposal, "subbasin" is used to refer
specifically to the Kern County Subbasin as defined by DWR. However, "basin", as used in GSP
regulations, may also be applied to the Kern County Subbasin for the purposes of this proposal.
2490 Mariner Square Loop, Suite 215 1 Alameda, CA 945011510 747 6920 1 toddgroundwater.com [ AGENCY
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new crop coefficients over the past 20 years; and (3) it is recognized that local water budget
data may not be adequately captured in the regional model. Todd Groundwater is
recommending subbasin-wide revisions to the C2VSim model to make the model more
accurate with respect to these three key items and to comply more closely with requirements
for a coordinated subbasin-wide water budget analysis. This proposal contains a scope of
services, schedule, and budget for expanding model revisions across the subbasin.
To develop a subbasin-wide model update of C2VSim, Todd Groundwater anticipates
requesting data from other local agencies to provide water budget input data for their
jurisdiction to compare to data in the model. The requested data are anticipated to include
managed water supply data (e.g., surface water deliveries, land use, irrigation demand, return
flows, and groundwater banking) and other relevant input data for inclusion in the revised
C2VSim model for improvement of model calibration in the Kern County subbasin. If data are
provided by others using a technically -defensible methodology (suggested formats/templates
to be provided), the input data would be uploaded into C2VSim by Todd Groundwater. In this
manner, the revised model and water budget analysis (for current and historical water
budgets) would best fulfill the GSP requirement for a coordinated water budget analysis and
would produce a more accurate analysis for the benefit of all in the subbasin.
This scope of services does not include data analysis by Todd Groundwater of local water
budget source data to develop the input water budget files; we assume that others would
employ their own hydrogeologic consultants to develop the revised input data in a
technically -credible manner. Our scope does include some local coordination for the transfer
of input data, but only to the extent needed to understand the input files being provided and
to ensure that the provided input data are being accurately represented in the revised C2VSim
model.
In addition, our approach does not include the production of local water budgets for other
GSAs. The scope of work does not include the analysis or demonstration of subsurface inflows
and outflows among any of the districts or GSAs. Local analysis of water budgets for the
KRGSA will be conducted as provided in our previous scope of work. The deliverable of this
modeling approach is a current and historical water budget for the entire Kern County
subbasin.
We think that this approach represents the best methodology for developing the most
accurate current and historical basin -wide water budget that considers GSP requirements and
deadlines. Additional discussion of the approach, a scope of services, and proposed schedule
and budget are included in subsequent sections of this memorandum.
C2VSim water Budget Modeling AGENCY
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APPROACH TO THE C2VSIM MODEL REVISIONS AND WATER BUDGET MODELING
The key objective of this scope of work is v.•e
to develop current and historical
subbasin-wide water budgets to meet F x.
GSP requirements.' Our general approach 8r" is to use the C2VSim model as a
comprehensive framework to provide -
consistent water budgets on a subbasin- -
wide basis.
As a regional model, the updated C2VSim
may over -generalize local conditions
within the Kern County Subbasin. As a
result, C2VSim results may
consistent with local site-specific data and
knowledge. To address this deficiency, we&n -
propose certain checks and revisions on
the managed water supply input data ?
(e.g., surface water deliveries, land use,
Irrigation demand, return flows, and
groundwater banking) in C2VSim. We also
propose allowing other GSAs to develop
their own water budget input files (using ! j
their local consultants or resources) and
input these revised data to improve Figure 1: DWR's new version of C2VSim will
model accuracy on a local basis. In have higher grid resolution in Kern County
addition, we also propose checking and
revising groundwater banking data for the large Kern Fan banking projects. Finally, we
propose incorporating the recently -developed crop coefficients from the remote sensing data
(being supported by the KRGSA and others). The revised C2VSim will reflect corrected local
data (to the extent provided by others) and the revised model will be used to develop current
and historical water budgets over the entire Kern County Subbasin. The following summarizes
key aspects of our approach.
Selection and Application of the C2VSim Model
C2VSim is a regional model of the California Central Valley developed by DWR using its
modeling code WFM. IWFM is an integrated model that simulates groundwater, the
unsaturated zone, and surface water flows. Given DWR's emphasis on water management,
' GSP regulations require current, historical, and projected water budgets. This scope of work
includes current and historical water budgets only. Projected water budgets require analysis of
individual projects conducted by each GSA to achieve the GSA -specific measurable objectives toward
sustainability. A projected water budget analysis for the KRGSA will be conducted as described in our
previous scope of work and is not reproduced herein.
C2VSim Water Budget ModelingAGENCY
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C2VSim provides a strong representation of surface water and groundwater water budget
components that makes it a preferred platform for determining water budgets. C2VSim is
anticipated to be DWR's primary tool for evaluating water management in the Central Valley
and is specifically referenced in the GSP regulations for application to GSP water budgets
(§354.18(f)); therefore, utilizing C2VSim is advantageous for GSP compliance.
DWR is in the process of updating C2VSim through September 2015 to support SGMA
compliance for the critically-overdrafted basins in the Central Valley. We will revise the
updated C2VSim (with simulations through September 2015) to develop a current and
historical water budget for the Kern County Subbasin. The updated C2VSim is expected to be
released by DWR in June 2017; however, input files for the updated model can be accessed
prior to the final model release. Given the GSP deadline, these files need to be obtained and
reviewed as soon as possible upon notice -to -proceed.
The updated C2VSim consists of a coarse-grained and a fine-grained version referred to as
C2VSim-CG and C2VSim-FG, respectively. The C2VSim-CG uses the mesh used in the previous
C2VSim version with data through 2009. Because the average element size of C2VSim-CG is
over 14 square miles, C2VSim-FG is also being developed by DWR to provide the data
resolution to better support SGMA (Figure 1). The C2VSim-FG will have an average element
size of 0.6 square miles. Both versions of the updated C2VSim will include the following
hydrostratigraphic layers:
• Shallow, unconfined aquifer
• Regional confining layers
• Active confined aquifer (contains high level of pumping)
• Inactive confined aquifer (contains limited pumping), and
• Saline confined aquifer.
This scope of work does not include changes to the hydrogeological conceptual model or
natural water budget components (such as precipitation, soil properties, or streamflow) of
C2VSim. Specifically, the architecture of the model including layering, discretization,
boundary conditions, and aquifer properties will not be revised. After the various
hydrogeologic conceptual models have been developed as part of the numerous GSPs in the
subbasin, there may be technical justifications for such changes to the C2VSim or other
regional model for future applications. However, these modifications can be considered for
future SGMA compliance after the initial GSPs containing the current and historical water
budgets have been submitted.
Consistency of Modeling with GSP Regulations
The Kern County Subbasin water budget will follow GSP regulations by providing an
accounting of the volume of groundwater and surface water entering and leaving the
subbasin and the change in the volume of water stored. Information will be reported in
tabular and graphical form as required by the regulations. Specifically, DWR requires that GSP
water budgets quantify the following:
C2VSim Water Budget Modeling
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• Total surface water entering and leaving a basin by water source type.
• Inflow to the groundwater system by water source type, including subsurface
groundwater inflow and infiltration of precipitation, applied water, and surface
water systems, such as lakes, streams, rivers, canals, springs and conveyance
systems.
• Outflows from the groundwater system by water use sector, including
evapotranspiration, groundwater extraction, groundwater discharge to surface
water sources, and subsurface groundwater outflow.
• The change in the annual volume of groundwater in storage between seasonal high
conditions.
• The amount of overdraft over a period of years during which water year and water
supply conditions approximate average conditions (if overdraft conditions occur as
defined in Bulletin 118).
• The water year type associated with the annual supply, demand, and change in
groundwater stored.
• An estimate of sustainable yield for the basin.
Selection of Time Periods for Water Budgets and Model Revisions
The updated C2VSim model will be capable of simulating a long-term base period (some data
back to the 1920s and more detailed data back to the 1970s). However, to adhere to the
expedited schedule and to provide a reasonable budget that also meets GSP requirements,
we propose that model revisions be limited to relatively recent and specific time periods when
data are more accurate and more readily available.
For the current water budget, GSP regulations require that the analysis be conducted for the
most recent water year' (WY) available; for the DWR-updated C2VSim model, this is reported
to be WY 2015. For the historical water budget, it is desirable to define a base period when
natural hydrology represents average conditions. Regulations require that this time period
cover at least 10 years. For this project, a 20 -year base period from WY 1995 through WY 2014
is proposed. This 20 -year period is associated with average conditions of precipitation and
Kern River flows (represented as 300% Annual Index on the Kern River). This period also
begins at the end of a dry period with relatively stable water levels. Additional documentation
for the historical time period was provided to the Kern Groundwater Authority (KGA) on
November 7, 2016 and included a number of hydrographs illustrating water level conditions
over the 20 -year time period.
The 20 -year time period is also advantageous for incorporation of newly -available data. It is
our understanding that the KGA has commissioned a remote sensing study of
evapotranspiration (ET) across the entire subbasin that will provide basin -wide values for
agricultural demand corresponding to the WY 1995 through WY 2014 base period. We will
use these data, as available, to check against agricultural demands already incorporated into
4 Water Year is from October through September. For example, Water Year 1995 is from October 1,
1994 through September 30, 1995.
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the most recent time period of the C2VSim model. Adjustments will be made to the model to
represent the newly -available data. These regional model revisions will be improved if other
GSAs coordinate by providing local water budget input data. We will ensure an overall mass
balance is considered in the zone budget revisions.
In our preliminary discussions with the C2VSim developers at DWR, a significant portion of
model uncertainty is related to incomplete data regarding groundwater banking and other
managed recharge operations in the Kern County Subbasin. Recognizing that several of the
large groundwater banking projects (especially those on the Kern Fan) pre -date the 20 -year
base period, we propose checking/revising data for groundwater banking operations dating
back to at least 1978, the beginning of banking at the City of Bakersfield 2800 Recharge
Facilities. For the Kern Fan banking projects, we will check data for the Kern Water Bank,
Berrenda Mesa, Pioneer Project, and the City of Bakersfield 2800 Recharge Facilities, and
verify these input data with the local banking authorities. For other district -specific
groundwater banking projects, we will rely on those districts to provide corrected data if
model revisions are necessary.
For these proposed time periods, monthly input data will be required. For example, for
surface water deliveries, monthly volumes (and locations) will be required from WY 1995
through WY 2015.
Revise C2VSim for Crop Coefficients, Groundwater Banking, and Local Water
Budgets,
Our approach for revising the DWR-updated C2VSim model includes:
• newly -acquired crop coefficient data from remote sensing studies
• historical amounts of groundwater banking, and
• monthly local water budget data if provided by other GSAs and/or water districts.
We assume that remote sensing data will be provided to us by the KRGSA, who can access
these data being developed by the KGA. We assume that groundwater banking data can be
verified and/or revised through coordination with the local banking authorities. Local water
budget inputs will be revised if local GSAs/water districts provide monthly input data for their
service areas.
We will work through the KRGSA on how best to coordinate with others to acquire the input
data in formats easily incorporated into the C2VSim model. A key feature of IWFM is DWR's
agricultural and urban water supply and demand management module that dynamically
simulates both surface water and groundwater supplies based on demand estimates, as
affected by usage and climatic conditions. Todd Groundwater will consider the function of
this module and provide a desired template to be used when obtaining input data from
others. We will coordinate with others to ensure our understanding and accurate
representation of input data into the model.
C2VSim Water Budget Modeling I AGENCY
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Coordinate with DWR
We will coordinate with DWR to work out methods to revise C2VSim in a manner consistent
with DWR practices and to facilitate a data transfer to support DWR after the development
of C2VSim with revised Kern County Subbasin data. Our scope includes time for coordination
and meetings forthese discussions. We will use DWR for technical support as needed, but the
scope of work herein will be conducted by Todd Groundwater.
DWR's current plan is that C2VSim-CG and C2VSim-FG will use the same water budget
information, but C2VSim-FG will provide a more detailed spatial distribution of the data,
especially in land use and crop type information. In our preliminary discussions with DWR,
C2VSim-CG is currently planned to be released in June 2017, but that C2VSim-FG does not
have a projected completion date. Therefore, we will use C2VSim-CG for developing the water
budgets if C2VSim-FG is not available.
PROPOSED SCOPE OF SERVICES
Our proposed scope of services incorporates our approach concepts discussed above. It is
organized around the plan contents in Article 5 of the GSP draft regulations, with due
consideration of other articles.
Task 1: Initial Review of C2VSim
To expedite the development of the Kern County Subbasin water budgets, we will review
currently available versions of C2VSim. An update of C2VSim through September 2015 is
currently being developed by DWR with an anticipated release date in mid -2017. To begin our
assessment in preparation of developing water budgets, we will obtain a beta version of the
C2VSim from DWR. We will then review the input data requirements and results for the Kern
County Subbasin to build a foundation for using C2VSim. This effort sets the stage for the
C2VSim revision in Task 3. The subtasks for Task 1 are described below.
1.1— Coordinate with DWR on C2VSim
To facilitate working with C2VSim, we will open a channel with the DWR C2VSim developers
to help facilitate our work. Early in the project, we will set up a meeting with appropriate DWR
staff responsible for developing the C2VSim model to discuss the data used for Kern County.
We will continue to coordinate with DWR over the life of the project, as needed, to help
resolve C2VSim and Kern County Subbasin-related issues.
1.2 —Assess Kern County Water Budget Data Requirements
The C2VSim input data for the Kern County Subbasin will be reviewed, focusing on the
managed water supply information. This step will build our working understanding of the
model. We will compile a list of the key managed water supply data already included in
C2VSim. This list can be compared to any data provided by local agencies to identify missing
or incomplete water budget components in the current version of C2VSim.
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1.3 — Initial Assessment of C2VSim Results in Kern County
The C2VSim results will be reviewed for the Kern County Subbasin to assess the quality of the
model simulations. The results of this review will be incorporated into a Model Development
Plan that will guide efforts for Task 3. The purpose of this plan is to help resolve issues
concerning key parameters and assumptions early so that these will not manifest themselves
later in the process. These will be documented in the Technical Report (Task 5).
Task 2: Coordinate with Local Agencies on Water Budget Input Data
As discussed previously, local water budgets will be coordinated with other GSAs/water
districts to verify the accuracy and, if warranted, to revise the input data. We emphasize that
we are not proposing to develop local water budgets for others; the output from the model
will be a current and historical water budget for the entire subbasin. We have not included
costs to analyze source data or develop the water budget components for areas outside of
the KRGSA. We propose only to revise the model with the best available information on local
water budgets. The following outlines the subtasks for Task 2.
2.1 Develop Local Agency Data Request
We will develop a data request to provide guidance to local agencies regarding the types of
water budget input data needed for the C2VSim revision. The data request will focus on
managed water supply information, but will also include the current understanding of overall
water budgets for comparison to the C2VSim results.
2.2 Coordinate with Local Agencies on Water Budgets
After the data request has been submitted to the local agencies, Todd Groundwater will be
available to answer questions and facilitate provision of the input data. Time is included for
two trips to Kern County to meet with others, as needed, to better understand the input data
being provided and to accurately represent the same in the revised model.
2.3 Compile and Review Local Agency Water Budget Data
We will compile water budget input data provided by others for comparison to the model.
The water budget data will focus on managed water supply information for the C2VSim
revision. For example, determination of groundwater irrigation demand can be calculated
from estimates of applied water and return flows using crop maps, and then subtracting
surface water irrigation supplies. Urban groundwater pumping and groundwater banking
recovery amounts are measured directly and provide a more accurate dataset to compare to
model estimates.
2.4 identify Data Gaps
The results of this compilation will be summarized using tables that put the water budget
components into a consistent format to illustrate the potential range and identify potential
data gaps. An assessment of these data will be performed to determine the overall strengths
and weaknesses of the different data sources. A proposed water budget for the GSP will be
developed that utilizes the highest quality data and is consistent with the conceptual
understanding of water management in the subbasin.
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2.5 Water Budget Workshop
A workshop meeting is planned to present the overall approach for developing the Kern
County Subbasin water budgets to the KRGSA land others), and to discuss issues and concerns
about the process. Feedback from the group will be used to improve and refine the water
budgets.
Task 3: Revise C2VSim with New Data
Task 3 includes revising C2VSim with the managed water supply information from others.
Because the IWFM code is primarily a text -based input data structure, time is included for
developing a systematic method for revising input data, outputting results, and providing data
quality reviews throughout the process. Task 3 is dependent upon DWR officially releasing the
new version of C2VSim through 2015. For scheduling purposes, we assume that the new
version of C2VSim will be available by lune 2017 and that input files are available in early
2017. The following outlines the subtasks for Task 3.
3.1 Verify C2VSim Data and Calibration in Kern County Subbasin
Once the officially released version of C2VSim through 2015 is released by DWR, we will
acquire the model and verify the results for the Kern County Subbasin. We will review the
model documentation to evaluate whether there are any changes in the input data for the
Kern County Subbasin compared to the beta versions used in Task 1.
3.2 Prepare Revised Dota for C2VSim Input
The data received from others will be formatted into the data file structure required for
C2VSim. Areas with little to no new information will default to original data contained in
C2VSim. Because input data for IWFM is in large text files, a systematic method for revising
input data and providing data quality reviews will be applied throughout the process.
3.3 Apply Revised C2VSim for Kern County Subbasin
After revisions are complete, the C2VSim will be setup and run. Ongoing quality review will
verify that the model is properly applying the new data. A sensitivity evaluation will be run for
a limited number of key parameters to evaluate the effects of varying parameters in the Kern
County Subbasin on model results. The results of the model runs will be processed and
tabulated.
3.4 Evaluate Revised C2VSim Performance
The results will be assessed to evaluate the effects of the new data on the overall model
calibration. The results will be compiled and documented for the Technical Report. We will
continue to coordinate with DWR during the C2VSim model revision process for the Kern
County Subbasin. Recommendations on how to improve the C2VSim model will be presented
to DWR so that future model revisions can take advantage of the local knowledge developed
for the GSPs and provide an improved tool for assessing water budgets in the future.
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3.5 C2VSim Revision Project Updates
Two project update meetings are planned to present the overall approach and results of the
C2VSim revision to the KRGSA (and others), and to discuss issues and concerns about the
process. Feedback from the group will be used to improve and refine the model.
Task 4: Generate Current and Historical Water Budgets for the Kern County Subbasin
After the C2VSim model is revised with Kern County Subbasin managed water supply data and
the results are verified, we will generate subbasin-wide water budgets for the Kern County
Subbasin. Water budget data will include the change in the volume of water stored, and the
information will be reported in tabular and graphical form as required by SGMA. The following
outlines the subtasks for Task 4.
4.1 Generate Initial Subbasin Water Budgets from Revised C2VSim
We will use the IWFM Z -Budget feature to develop the subbasin water budgets from the
revised C2VSim. The water budgets will quantify the required elements required for SGMA
including simulation results for subsurface inflows and outflows, managed aquifer recharge
and irrigation pumping and return flows.
4.2 Public Review of Subbasin Water Budgets
After initial review and comment by the KRGSA, the results of the Kern County Subbasin water
budgets from Task 4.1 will be reviewed in a public workshop. We will address comments on
the water budgets and work to reconcile any questions on the results. We will compile a list
of recommended changes for consideration of the final Kern County Subbasin water budgets.
4.3 Generate Final Subbasin Water Budgets from C2VSim
Final Kern County Subbasin water budgets will be generated using an agreed upon list of
recommended changes. Final subbasin water budgets will include the change in the volume
of water stored, and the information will be reported in tabular and graphical form as
required by SGMA. Results will be documented in the Technical Report to provide the
technical basis for the Subbasin water budgets to support the Kern County Subbasin GSPs.
4.4 Kern County Subbasin Water Budget Workshop
The results of the initial C2VSim water budgets will be presented to KRGSA (and others) during
a public workshop.
Task 5: Technical Report
A technical report will be developed that documents the work performed for this scope of
work. The technical report will provide the technical basis for developing the KRGSA and
subbasin-wide water budgets and revising C2VSim. The modeling results and water budgets
produced for the Technical Report will be consistent with DWR's SGMA guidelines and BMPs.
The following subtasks are included in Task S.
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5.1 Draft Report
For costing purposes, we assume that the draft technical report will require two draft
versions. An Administrative Draft Technical Report will be prepared for KRGSA review and
comments. Comments will be incorporated into a Draft Technical Report. Electronic submittal
is assumed for both versions.
5.2 Final Report
The Final Technical Report will address final comments and will be included as an appendix in
the KRGSA GSP. As directed by the KRGSA, the report will also be submitted to entities
providing cost reimbursement. For costing purposes, we assume FedEx delivery of 10 hard
copies plus an electronic version for the Final Technical Report covering the current and
historical water budgets.
Task 6: Project Coordination and Communication
This task covers project coordination with the client throughout the project. Coordination will
include project planning, on-going communications and project status updates. We assume
that communication during the project will be conducted via emails, telephone and web
meetings.
KEY ASSUMPTIONS FOR COMPLETING SCOPE OF WORK
Based on our experience, this is an aggressive, but realistic schedule for completing the scope
of work contingent upon cooperation of the KRGSA and other agencies in the Kern County
Subbasin in working through potential issues related to the water budgets. In order to adhere
to the budget and schedule, our key assumptions are as follows:
• The official release of the updated C2VSim by DWR with simulation results through
September 2015 occurs by late summer 2017. We will request beta versions of the
model for initial work; however, the water budgets will need to be based on the
official version. Any delays by DWR in releasing this model may impact the schedule.
• C2VSim is developed using the IWFM modeling code, which uses a text -based input
data structure; therefore, time is included for developing a systematic method for
revising input data, outputting results, and providing data quality reviews for
working with this type of data structure.
• We will coordinate with agencies, as appropriate, to understand data provided and
to check data for reasonableness, as well as QC data entry into the model.
Nonetheless, we cannot be responsible for errors or omissions provided by others in
either the local water budget data, source data, or methodologies employed by
others to develop the water budget data.
• This scope of work focuses on historical and current water budgets for the Kern
County Subbasin. Projected water budgets, which are also required by the GSP
regulations, are not included in this scope of work.
• This scope of work addresses only changes related to the managed water supply
components of C2VSim, and does not include changes to the hydrogeological
C2VSim Water Budget Modeling [1AQVICYKern County Subbasin GSAs 11 TODD GROUNDWATER 3: NAI
conceptual model or natural water budget components. We assume that no
alterations will be made to the C2VSim including architecture, layering, or grid
spacing.
The scope of work does not include hydrogeologic consulting required to develop
local water budgets for other local agencies; rather, we assume that the water
budget input data will be provided by qualified professionals working separately
under the direction of the local agencies.
C2VSim input data for areas where local agencies provide little to no additional
information, or data that cannot be readily incorporated into the model, will default
to data already contained in C2VSim.
COST ESTIMATE
A cost estimate is provided at the end of this text on Table 2. Our budget for the groundwater
assessment including Tasks 1 through 7 is estimated to total $431,957 as summarized on
Table 1. Costs include labor, fees, and expenses for each project task.
The largest level of effort is assigned to Task 3 to revise the existing C2VSim with Kern County
Subbasin managed water data. A relatively large level of effort is also assigned to Tasks 2 and
4 for development of subbasin wide water budgets and coordination with local agencies. This
is likely to be one of the first GSPs to be prepared in the State, which introduces some
uncertainty for the cost estimate. Nonetheless, we think that the scope and costs have been
developed with a good understanding of the recently -adopted regulations.
This budget modifies our previous budget for developing a GSP for the KRGSA as follows.
Total Estimated GSP Budgets
Previous Cost Estimate dated May 9, 2016 $359,964
(as modified July 16, 2016 in Exhibit A of KRGSA 16-002)
Cost Estimate from Table 1 herein (January 17, 2017) $431,957
Total GSP Budgets $791,921
SCHEDULE
Assuming approval of this project, we can complete the proposed scope of work in about
nineteen months from the notice to proceed. The Todd Groundwater Team stands ready to
start upon notice -to -proceed in February 2017; if approved in February 2017, and the DWR
updated C2VSim model is available in July 2017, we should be able to complete the project
by September 2018. Our proposed schedule is provided by task and subtask in Table 2.
Proposed Project Updates and Workshop meetings are shown as diamonds.
C2VSim water Budget Modeling J ADEN
Kern County Subbasin GSAs 12 TODD GROUNDWATER ORIGINAL
Table 1: Cost Estimate Todd Groundwater
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IACENCY
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ATTACHMENT 2
OAC
ORIGINAL
Attachment 2
Todd Groundwater Modeling Participating Percentages
Activity Agreement Member
Participating
Acreage
Participation
Percentage
Initial
Budget
Buena Vista Water Storage District
47,810
4.41%
19,063.95
Henry Miller Water District
26,055
2.40%
10,389.27
Kern Groundwater Authority
Arvin Community Services District
2,560
0.24%
1,020.78
Arvin -Edison Water Storage District
100,031
9.23%
39,886.76
Cowelo Water District
46,441
4.29%
18,518.07
Kern County
30,000
2.77%
11,962.32
Kern County Water Agency
2,230
0.21%
889.20
Kern -Tulare Water District
11,160
1.03%
4,449.98
Kern Water Bank Authority
20,492
1.89%
8,171.06
North Kern Water Storage District
80,037
7.39%
31,914.27
Rosedale -Rio Bravo Water District
43,356
4.00%
17,287.94
Semitropic Water Storage District
223,342
20.61%
89,056.27
Shatter-Wosco Irrigation District
38,918
3.59%
15,518.32
South San Joaquin Municipal Utilities District'
64,712
5.97%
25,803.52
West Kern Water District
10,712
0.99%
4,271.35
Westside Water District Authority
7,680
0.71%
3,062.35
Wheeler Ridge-Moricopo Water Storage District
90,842
8.38%
36,222.70
Kern River GSA'''
231,934
21.41%
92,482.28
Olcese Water District
5,090
2,029.61
Totals
1,083,402
100.47%
0.00%
432,000.00
'Includes McFarland GSA
Includes Greenfield GSA
'Includes half of Lamont PUD acreage
ACEF:CY
00 jr NAL