HomeMy WebLinkAbout11 Attachment 1 - MVGB 2020-2021 Annual Report_Final/7)
GE1 XConsullants
Consulting
Engineers and
Scientists
Annual Report for the Martis Valley Groundwater Basin
Water Years 2020 and 2021
June 2, 2022
�TRUCKEE DONNER
PUBLIC UTILITY DISTRICT
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GEI Consultants
Consulting
Engineers and
Scientists
Martis Valley Groundwater Basin Annual Report
Water Years 2020 and 2021
Prepared for:
Truckee Donner Public Utility District
On behalf of Truckee Donner Public Utility District, Northstar Community Service District,
and Placer County Water Agency collectively referred to as the MVGB Agencies.
Prepared by:
GEI Consultants
2868 Prospect Park Drive, Suite 400
Sacramento, CA 95670
June 2, 2022
TRUCKEE DONNER PUBLIC UTILITY DISTRICT
MARTIS VALLEY GROUNDWATER BASIN ANNUAL REPORT
WATER YEARS 2020 AND 2021
Certifications and Seals
This report and analysis was prepared by the following GEI Consultants Inc. professional geologists.
Report sections contained herein based on available data and were prepared by:
Date: June 2, 2022
S Storey
Geologist -In -Training No. 812
Date: June 2, 2022
Richard W. Shatz
Principal Hydrogeologist
California Certified Hydrogeologist
C.H.G. No. 84
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 i
Table of Contents
Tableof Contents.....................................................................................................................................................ii
ExecutiveSummary.................................................................................................................................................1
1.
Introduction....................................................................................................................................1
1.1 Martis Valley Groundwater Basin........................................................................................1
1.2 Climatic Conditions.............................................................................................................2
1.3 Surface Water Conditions...................................................................................................2
2.
Groundwater Conditions...............................................................................................................7
2.1 Groundwater Levels............................................................................................................7
2.2 Groundwater Flow.............................................................................................................13
3.
Groundwater Extraction..............................................................................................................18
4.
Surface Water Diversions...........................................................................................................25
5.
Groundwater Recharge...............................................................................................................27
6.
Total Water Use............................................................................................................................28
7.
Change in Groundwater Storage................................................................................................29
8.
Groundwater Management Activities.........................................................................................35
9.
Conclusions.................................................................................................................................36
10.
References....................................................................................................................................37
Attachment A. Monitoring Well Hydrographs.....................................................................................................38
Figures
Figure 1 Martis Valley Groundwater Basin Location
Figure 2 Annual Precipitation Deviation from Mean: Truckee Ranger Station No. 049343
Figure 3 Martis Valley Groundwater Basin Monitoring Well Locations
Figure 4 Martis Valley Groundwater Basin Historic Groundwater Level Elevations, Water Years 1989-2021
Figure 5 Martis Valley Groundwater Basin Historic Groundwater Level Elevations, Water Years 2015-2021
Figure 6 Martis Valley Groundwater Basin Spring 2020 Groundwater Elevation Contours
Figure 7 Martis Valley Groundwater Basin Fall 2020 Groundwater Elevation Contours
Figure 8 Martis Valley Groundwater Basin Spring 2021 Groundwater Elevation Contours
Figure 9 Martis Valley Groundwater Basin Fall 2021 Groundwater Elevation Contours
Figure 10 Martis Valley Groundwater Basin Locations of Groundwater Extractions
Figure 11 Martis Valley Groundwater Basin Community Water System Monthly Pumping Totals
Figure 12 Martis Valley Groundwater Basin Change in Groundwater Elevation, Spring 2019-Spring 2020
Figure 13 Martis Valley Groundwater Basin Change in Groundwater Elevation, Spring 2020-Spring 2021
Figure 14 Change in Storage and Groundwater Use
Tables
Table 1 Groundwater Extractions for Water Year 2019-2020
Table 2 Groundwater Extractions for Water Year 2020-2021
Table 3 Surface Water Usage Reported for Water Year 2019-2020
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 ii
Table 4 Surface Water Usage Reported for Water Year 2020-2021
Table 5 Estimated Groundwater Recharge from T-TSA for Water Years 2019-2020
Table 6 Estimated Groundwater Recharge from T-TSA for Water Years 2020-2021
Table 7 Total Water Use for Water Years 2020-2021
Table 8 Estimated Change in Storage
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 iii
Executive Summary
This report provides annual monitoring data and an assessment of groundwater conditions in the Martis
Valley Groundwater Basin (MVGB or Basin) for water years 2020 and 2021. A water year (WY) is
defined as October through September of any year.
The MVGB does not have to comply with the Sustainable Groundwater Management Act, as the Basin
was re-classified in 2018 as a very low priority basin. However, the MVGB Agencies recognize the
importance of groundwater management and are continuing to implement their 2013 Groundwater
Management Plan.
Groundwater levels, groundwater extractions, surface water conditions, groundwater recharge from
locally derived and imported wastewater, measured and estimated total water use and groundwater storage
change estimates were compiled and analyzed. Climatic conditions were also evaluated as to their effects
on groundwater levels.
Both WYs 2020 and 2021 have been classified as dry years based on precipitation with WY 2021 being
the driest on record. In WY 2021, rainfall was less than 50 percent of normal rainfall. Groundwater levels
throughout the Basin decreased due primarily to the lack of precipitation recharging the aquifers and
increases in groundwater pumping in response the extremely dry conditions. Most wells remained above
their lowest measured groundwater levels in WY 2020 and 2021, except for three wells during the dry
summer months of each water year. The historical record for these wells is limited and in recent years the
participating agencies have substantially increased the number of reporting wells and intervals of
measurement The detection of the groundwater levels exceeding the lowest levels previously recorded
would not have been detected without the Agencies increasing groundwater level monitoring frequency
to a monthly basis.
Groundwater pumping in the Basin increased by about 10 percent, about 800 acre-feet (average), during
these water years in comparison to previous years (average from 2016 through 2019). Change in
groundwater storage values reflected the extremely dry conditions and moderate increase in pumping, and
overall groundwater in storage decreased by about 17,000 acre-feet (AF) over the last two WYs. Most
groundwater basins in northern California experienced decreases in storage during these two WYs. The
average annual groundwater pumping over this two-year period was approximately 7,400 AF, much less
than the sustainable yield of 22,000 AF per year, which suggests that the long-term groundwater levels
and storage will recover after above normal and wet precipitation year(s). The Basin storage has been
conservatively estimated to be about 484,000 AF so the overall change over the last two years is relatively
small (about 3.5%) in comparison to the total water stored in the Basin.
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 ES-1
1. Introduction
The Martis Valley Groundwater Basin (MVGB or Basin) groundwater resources have been evaluated for
many years starting in the 1990s. In 2013, a Groundwater Management Plan (GMP) was developed for
the Basin (Brown and Caldwell, 2013). In 2014, the Sustainable Groundwater Management Act (SGMA)
classified the MVGB as medium priority basin, which required compliance with the SGMA regulations.
In December 2016, an Alternative Submittal to a Groundwater Sustainability Plan was submitted to the
California Department of Water Resources (DWR) by the Truckee Donner Public Utility District
(TDPUD) on behalf its MVGB SGMA Local Agencies (MVGB Agencies), which include TDPUD,
Northstar Community Services District (NCSD), Placer County Water Agency (PCWA), the Town of
Truckee, Nevada County, and Placer County. As referenced in the MVGB Alternative Submittal, scientific
analyses determined the Basin has at least a 25-year history of sustainable groundwater operations and
conditions, despite several periods of drought. In compliance with SGMA requirements an Annual Report
for water years (WYs) 2016 and 2017 were developed and submitted to DWR.
Prior to DWR completing its review of the Alternative Submittal and Annual Reports, DWR was required
to review basin prioritizations as part of implementation of SGMA. The MVGB Agencies reviewed
DWR's initial prioritization of the Basin and worked extensively with DWR staff to ensure accurate
information was being used. In 2018, DWR re-evaluated the Basin and changed its priority to Very Low
Priority, thus the Basin was no longer required to comply with SGMA. The MVGB Agencies recognize
the importance of groundwater management and have subsequently reconvened to implement the 2013
GMP. As part of this plan, Best Management Objective #1 is to compile an annual report to summarize
groundwater conditions and to share the information with interested stakeholders. Since WY 2018, the
MVGB Agencies have prepared annual reports and have shared them with stakeholders. This document
provides a summary and interpretation of groundwater conditions for WY's 2020 and 2021, instead of
just one WY, due to COVID restrictions. The report provides historical data for reference along with a
more detailed assessment of the conditions since implementation of the GMP.
1.1 Martis Valley Groundwater Basin
The MVGB, Basin No. 6-67, as defined by DWR in Bulletin 118 Interim Update (2016), is a 35,600-acre
(57-square-mile) intermontane, fault -bounded basin east of the Sierra Nevada crest. Figure 1 shows the
location of the MVGB and pertinent geographic features.
The MVGB uses groundwater almost exclusively for water demands, although several major surface water
bodies are present within the Basin. The Truckee River traverses the Basin from the southwest to the
northeast in a shallow, incised channel. Principal tributaries to the Truckee River within the MVGB are
Donner Creek, Martis Creek, and Prosser Creek; as well as discharge from Boca Reservoir slightly before
the Truckee River leaves the Basin. Surface water storage reservoirs inside MVGB include Martis Lake
and Prosser Reservoir. Donner Lake and Boca Reservoir lie just outside the MVGB boundaries, but release
surface water into the MVGB. Although surface water released from reservoirs is not used to satisfy local
demands, it is a major, and highly regulated, component of the Basin's hydrologic system. Surface water
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 1
within the MVGB is under the purview of the Truckee River Operating Agreement (TROA), a Bi-State,
multi -party Federal Agreement enacted by the US Congress which sets limits on the consumptive use of
both groundwater and surface water in the Basin.
Wastewater is generated within the MVGB, within the Truckee River watershed, and outside the
watershed (Lake Tahoe area) and sent to a treatment facility operated by the Tahoe -Truckee Sanitation
Agency (T-TSA). The treated water is recharged into the groundwater system via two leach fields
(Figure 1), increasing the groundwater contribution to downstream Truckee River flows.
1.2 Climatic Conditions
Water year types were developed for the MVGB using local precipitation data from Truckee Ranger
Station No. 049043. Its location is shown on Figure 1. WY 2020 was California's fifth driest year and
WY 2021 is the second driest on record (DWR 2021). The average precipitation at the Truckee Ranger
Station (1988-2019) was 29 inches while WY 2020 received only 18 inches and in WY 2021 only 14
inches, less than half of normal and the driest on record. The deviation of annual WY precipitation from
the mean is shown on Figure 2. Wet conditions were set at more than one standard deviation above the
mean annual WY precipitation total. Above normal conditions were defined as annual precipitation
between the mean value and one standard deviation above it. Likewise, below normal conditions were
defined as an annual precipitation between the mean value and one standard deviation below it. Dry
conditions were defined as an annual precipitation total more than one standard deviation below the mean.
WYs 2020 and 2021 are both classified as dry water years and have been the only back-to-back dry years
reported during the period of record at the Truckee Ranger Station. Since precipitation is the major source
of recharge in the Basin, groundwater levels responded by decreasing during the last two years.
1.3 Surface Water Conditions
The Truckee River is the dominant hydrologic feature in the MVGB. It conveys hundreds of thousands of
acre-feet (AF) of surface water through the Basin and flows along the lowest portions of the Basin. The
measured outflow of the Truckee River at the edge of the Basin was about 385,000 AF in WY 2020, and
only 290,000 AF in WY 2021.
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 2
Figure 1. Martis Valley Groundwater Basin Location
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L 2 1 0 2 " Martin Valley Annual Report MARTIS VALLEY GROUNDWATER BASIN
Water Year 2020 and 2021
W E Nevada and Placer Counties, California LOCATION
Miles I
s Truckee -Donner Public Utility District GE consultants APRIL 2022 FIGURE 1
V
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 3
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Water Years 2020 and 2021 4
Figure 2. Annual Precipitation Deviation from Mean: Truckee Ranger Station No. 049343
35
30
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Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 5
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Water Years 2020 and 2021 6
2. Groundwater Conditions
Wells used for groundwater level monitoring (labeled as CASGEM wells or piezometers) in the MVGB
are shown on Figure 3. Groundwater levels at these wells are monitored by the MVGB Agencies and
DWR and are reported to the California Statewide Groundwater Elevation Monitoring (CASGEM)
program. These wells are used to help assess the sustainability of the MVGB. Data from the wells were
used to generate hydrographs to show groundwater level elevation trends over time at each monitoring
location. Groundwater levels in the Basin range from within a few feet of ground surface to as much as
100 feet below ground surface and have consistently remained within this range.
Historically, groundwater level measurements were taken in the spring and fall. In 2017, the MVGB
Agencies voluntarily implemented monthly monitoring of groundwater levels for all wells in the
CASGEM program. This proactive move to monthly monitoring was, in part, to investigate and address
uncertainties in seasonal variations. This evaluation continues to utilize spring and fall measurements to
assess the health of the Basin, to show whether the basin has refilled in the spring, and the effects of
pumping in the fall. Monthly groundwater measurements are illustrating that peak summer -time
groundwater pumping temporarily lowers groundwater levels below the previous fall measurements, as
would be expected, but are not depleting reserves. Because of climatic conditions groundwater levels may
vary from year to year but should fully recover during above -normal to wet precipitation years.
Three of the CASGEM monitoring wells (TH-Fibreboard, TH-Prosser Village, and TH-Martis Valley) are
located near municipal supply wells that at times affect their measurements. Historically, it was not
documented whether the nearby municipal wells were pumping or recently shut off when the
measurements were taken. This has been corrected in recent years by shutting off the pumping wells for
at least one -hour prior to taking a groundwater level measurement. In addition to the CASGEM wells, six
temporary piezometers were constructed near Martis Creek for a restoration project and provided some
additional information about the groundwater conditions in the Basin. In WY 2019, groundwater level
measurements were discontinued at these piezometers.
The MVGB Agencies' monitoring network has good regional distribution (covering over 70 percent of
the Basin) and is monitoring groundwater levels near areas of pumping, inflow, and outflow. The network
has 30 years of data that can be used to assess changes in the Basin and monitor aquifers that are being
used for municipal and industrial purposes.
2.1 Groundwater Levels
Long-term hydrographs, from 1989 through 2021 for all of the 14 monitoring wells, are presented on
Figure 4 along with the water year types. Figure 5 provides a shorter time period than Figure 4 to further
assess these seasonal variations in groundwater levels. Hydrographs for each individual monitoring well
are presented in Attachment A.
Based on spring to spring and fall to fall measurements, groundwater elevations, depending on the location
in the Basin, are generally stable remaining within their historic ranges but some levels have decreased by
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 7
more than 10 feet over the last two years. This is expected due to both WYs being classified as dry with
reduced recharge potential caused by less than 50 percent of normal precipitation and about 10 percent
increase in pumping in response to the drought conditions. Local lowering of groundwater levels by this
amount is not of concern as there is still over 800 feet of saturated sediments and the aquifers will likely
recover after the next above normal to wet precipitation years. Seasonal fluctuations due to climate and
pumping patterns are apparent. In general, spring groundwater levels decreased overall from 2019 to 2020
and fluctuated both directions from 2020 to 2021, primarily in response to decreased recharge due to the
drought conditions. WYs 2020 and 2021 groundwater levels are all within their historical ranges except
for two wells (Fibreboard TH and 18N17E33LO01) that fell below their historical fall lows in 2020 and
2021, by 18 and 0.6 feet, respectively. The larger drawdown at the Fibreboard TH is likely due to influence
from the nearby municipal well. As shown by groundwater level measurements from the Fibreboard TH,
obtained during 2020, groundwater levels recovered by more than 40 feet within two months of after
pumping was stopped in the nearby municipal well, indicating this was not a permanent depletion of
groundwater but a temporary and local effect of pumping.
There were three wells that fell below their historical lows but these were during the summer months of
both WYs when there was no historic monthly data to compare them to, including the previous drought
years of 2012 to 2016 which likely would have recorded lower monthly groundwater levels. Groundwater
levels in the Fibreboard TH monitoring well fell below fall historical lows by about 16 feet for 4 months
in the summer of WY 2020, and 25 feet below the historical low in the summer of WY 2021 for 5 months.
The Prosser Village TH monitoring well fell just below historical low in WY 2020 for 1 month and fell 9
feet below historical lows for 2 summer months in WY 2021. Well 18NI7E33LOO1M fell less than 1 foot
below historic fall low for 3 months in WY 2021. These wells may be influenced by pumping at nearby
municipal wells.
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 8
Figure 3. Martis Valley Groundwater Basin Monitoring Well Locations
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1 . i -I TDPLJD Municipal Well
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2 1 0 2 Martis Valley Annual Report 1 MARTIS VALLEY GROUNDWATER BASIN
Water Year 2020 and 2021 MONITORING LOCATIONS
W - t' Nevada and Placer Counties, California
Miles
G E
i Truckee -Donner Public Utility District Consultants APRIL 2022 FIGURE 3
3
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 9
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Water Years 2020 and 2021 10
Figure 4.
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Martis Valley Groundwater Basin Historic Groundwater Level Elevations, Water Years 1989-2021
Monthly
Measurements
17N16E17F002 M
17N17E29B001M
18N16E22H001M
17N16E11F001M
17N17E19K001M
17N17E07POO1M
17N17E18COO1M
18N17E33L001M
17N16E13KOO1M
TH-Fibreboard
TH-Prosser Village
TH-Martis Valley
17N16E13K003M
17N17E05D001M
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■ ■■■■■ ■■ i I ■ ■• ■ ■ Dry
■ 0 No NONE 0 ■ ♦ water Year Start/End
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0 0 0 0 0 0 0 0 0 o o 0 0 0 0 0 0 0 0 0 o o 0 0 o a o 0 0 0 0 0 0
Water Year Data collected from https://www.casgem.water.ca.gov
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 11
Figure 5. Martis Valley Groundwater Basin Historic Groundwater Level Elevations, Water Years 2015-2021
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5,900
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Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 12
2.2 Groundwater Flow
Seasonal groundwater level elevation contours for Spring and Fall 2020 through 2021 are shown on
Figures 6 through 9. These contours reflect pumping, recharge, geologic conditions, and discharges to
surface water. Monitoring well groundwater levels and bed elevations of gaining surface water reaches
were used to develop the groundwater elevation contour maps. Groundwater levels at 17N16E13K003M
were used for contouring as 17N 16E 13K001 M appears to reflect groundwater levels in a shallower portion
of the aquifer.
As expected, Fall season contours exhibit lower groundwater level elevations in the central portions of the
Basin, relative to Spring conditions, due to increased pumping and less natural recharge. Spring contours
for both years are similar, although at slightly different elevations, indicating recharge is reaching and
refilling the aquifers despite the dry conditions during the summer months.
The groundwater flow patterns remained generally the same during both water years, with flow from the
perimeter of the MVGB towards the Truckee River, consistent with previous years. The groundwater
contours show pumping has changed this regional pattern near the airport, but this is not a new
development as the historical contours have also reflected this pumping depression. The pumping
depression appears to be caused by the Martis Valley municipal well. The extent and depth of the
depression has increased slightly because of the dry conditions of both WYs 2020 and 2021.
Beginning in Fall 2020 a new pumping depression formed east of the town of Truckee and north of the
Truckee River and remained through Spring and Fall 2021. Historically the contours showed discharges
to the river, but with the lower groundwater levels due to drought conditions and the creation of a pumping
depression, surface water may be discharging to groundwater in this area while the depression is present.
The pumping depression appears to be the result of increased pumping from the Fibreboard, Prosser, and
Old Greenwood wells.
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 13
Figure 6. Martis Valley Groundwater Basin Spring 2020 Groundwater Elevation Contours
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-_--- -----------•-------_-•__�-----------____��____--------- �� �— � � � � � TDPt1D Municipal
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y - ! Well 3ell`i D Northstar (NCSD)
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k R
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s Martis Valley Annual Report MARTIS VALLEY GROUNDWATER BASIN
a 1 0 2 Water Year 2020 and 2021 GROUNDWATER ELEVATION CONTOURS
J w_*L.
Nevada and Placer Counties, California SPRING 2020
Miles
i Truckee -Donner Public Utility District GE consultants APRIL 2022 FIGURE 6
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 14
Figure 7. Martis Valley Groundwater Basin Fall 2020 Groundwater Elevation Contours
- r -
�. „a�
/ � r 1BN16E22H 1 keseno-rr
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' S739:82 1-� BASIN
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e
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h County Boundary
Martis Valley Annual Report NIARTIS VALLEY GROUNDWATER BASIN
2 1 0 2 Water Year 2020 and 2021 GROUNDWATER ELEVATION CONTOURS
r w I: Nevada and Placer Counties, California FALL 2020
Miles
a s Truckee Bonner Public Utility District E I [Qnsultants APRIL 2022 FIGURE 7
S
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 15
Figure 8. Martis Valley Groundwater Basin Spring 2021 Groundwater Elevation Contours
r'
t
4. , „gal
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{:.• � TQPkJQ Municipal
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X 590 T Groundwater
_ Elevation
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e Flow Direction
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s * r
iL
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r L---
I Martis Valley Annual Report NIARTIS VALLEY GROUNDWATER BASIN
L 2 1 0 2 Water Year 2020 and 2021 GROUNDWATER ELEVATION CONTOURS
L Nevada and Placer Counties, California SPRING 2021
MilesG E Truckee Donner Public Utility District consultants APRIL 2022 FIGURE 8
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 16
Figure 9. Martis Valley Groundwater Basin Fall 2021 Groundwater Elevation Contours
ti
4. .• do
• -
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je 18N-1 E22[� esenvrr. -
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5900N1fiE11F001M /�I73ti117E18C0 1M 5850 VALLEY
,6000 ,5"7%58 573GA2 BASIN
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5uuthside Martis Valley 5745.51
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r r 5900 — 5900 5850 T 2
'? ? Groundwater
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y — Contours Fall
P - - 2021 (ft msl)
cj y"
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- Groundwater
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a t' in — County Boundary
1 0 z Mantis Valley Annual Report MARTIS VALLEY GROUNDWATER BASIN
Water Year 2020 and 2021 GROUNDWATER ELEVATION CONTOURS
w' -- Nevada and Placer Counties, California Miles FALL 2021
a F
x Truckee Danner Public Utility District ` Consultants APRIL 2022 FIGURE 9
Mantis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 17
3. Groundwater Extraction
Groundwater extractions for various water use sectors are presented in Tables 1 and 2 for WYs 2020 and
2021, respectively. The methods used to measure extraction data are noted along with water use sector
totals. The total water use is based on metered and estimated pumping. The general locations of the
community water service areas and non -community water purveyors, along with the location of golf
courses, are shown on Figure 10. Total groundwater extraction in the MVGB was about 7,160 and
7,670 AF for WYs 2020 and 2021, respectively, well below the sustainable yield estimate of 22,000 AF.
Municipal groundwater extractions by TDPUD and NCSD, which are metered, account for about
80 percent of the total extractions; therefore, total groundwater extraction is well quantified. Groundwater
extraction estimates for non -community uses and golf course irrigation were developed by others and are
reported annually to the DWR, State Board, and TROA program. These estimates are developed on a
calendar -year basis, not by WYs. The calendar -year extraction data is approximately equal to WY
estimates due to the annual cycle of climatic conditions, including freezing temperatures and significant
amounts of snow and other precipitation, which typically limits the need to pump groundwater in the
spring and summer months of each WY. These estimated values are provided in Tables 1 and 2. A full
reporting of annual 2021 estimates will be available later in 2022, in the TROA annual report.
The locations of wells for the public and community water systems, and general locations of golf courses
and non -community entities that also use groundwater in the MVGB, are shown on Figure 10. The
distribution of groundwater extractions for the wells are illustrated by the size of the symbol (magnitude)
and color (pumping entity). The largest volume of water extracted at any location in the MVGB is from
the Martis Valley well, located near the airport, and has altered the regional groundwater flow direction.
Three other wells north of the Truckee River and east of the town of Truckee are the next largest producers
in the valley and changed the overall regional groundwater flow direction in both WYs. Groundwater
pumping increased on average by about 800 AF during WY 2020 and 2021 contributing to the pumping
depression. The depth of the pumping depression may also be greater due to drought conditions and lower
overall regional groundwater levels. Figure 10 is also useful for comparison with the groundwater contours
(presented in Section 2) and corresponds with the pumping data.
Graphical representations of monthly and annual pumping for TDPUD and NCSD wells are presented on
Figure 11. Seasonally, groundwater demand peaks in the summer and declines to approximately one-third
to one -quarter of that amount during the winter and spring. This distribution suggests that calendar (for
non -community users and golf course irrigation) and water year pumping estimates are typically similar
in magnitude for this Basin, hence the tabulated totals in Tables 1 and 2 with calendar year pumping
estimates are defensible surrogates to approximate water year pumping estimates. Figure 11 also shows
that the overall pumping volume fluctuates from year to year but overall remains consistent unless dry
conditions persist, varying by about 1,000 AF over the last 4 years. Groundwater use was higher in WY
2021 than in 2020, consistent with the second year of below -normal precipitation.
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 18
Table 1 Groundwater Pumping for Water Year 2019 - 2020 (values in acre-feet)
2019 2020 Annual
Metered
Agency Estimated Oct Nov Dec Jan Feb Mar Apr May Jun Jul AugSeR Total Percent
Public Utility Water Purveyors 1
Truckee -Donner PUD
Potable Water Year
1. Airport Well
Metered
9
10
11
2. Martis Valley Well
Metered
156
161
169
3. South Side Well
Metered
0
0
0
4. Glenshire Dr Well
Metered
9
0
0
S. Hirschdale Well
Metered
1
1
1
6. Prosser Annex Well
Metered
16
0
0
7. Prosser Heights Well
Metered
7
0
0
8. Sanders Well
Metered
0
0
0
9. Prosser Village Well
Metered
50
40
43
10. Northside Well
Metered
0
0
0
11. Old Greenwood Well
Metered
23
12
24
12. Well 20
Metered
5
0
0
13. "A" Well
Metered
0
0
0
Non Potable
14. Fibreboard Well
Metered
30
3
0
15. Donner Creek Well
Metered
0
0
0
16. Southside Well #1
Metered
1
1
0
Subtotal
308
228
247
Commu
'
Northstar C.S.D.
TH-1
Metered
2
1
3
TH-2
Metered
2
0
1
Well
Metered
13
0
0
Well
Metered
18
8
11
Well
Metered
3
1
1
Subtotal
38
11
16
lNon-Community Water Purveyors3'1 N
(Estimated using
2020 calendar year values.)
Hobart Work Centers
Estimated
Aggregates Martis Valleys
Estimated
14
12
13
12
20
10
21
20
7
159
158
158
165
168
182
208
219
220
212
2,175
0
0
0
0
0
0
0
0
0
0
0
0
0
0
8
43
77
69
51
257
1
1
1
1
1
1
1
1
1
9
0
0
0
0
17
23
26
26
24
132
0
0
0
0
9
14
16
16
15
78
0
0
0
0
31
39
39
38
36
183
45
33
27
32
82
97
104
103
92
747
0
0
0
0
0
14
18
20
16
68
24
20
26
30
48
65
91
83
66
512
0
0
0
0
8
15
19
18
16
81
0
0
0
0
0
0
0
0
0
0
0
0
0
15
68
85
102
98
74
474
0
0
0
5
22
40
50
53
34
203
0
0
0
0
0
2
0
1
1
5
242
224
232
261
493
655
782
767
645
5.083
71%
Water Year
0 0 1 0 0 16 28 19 18 89
3 1 0 0 6 12 25 31 22 104
0 0 0 0 13 41 38 39 33 178
9 8 7 9 32 23 38 42 40 244
1 1 1 1 3 4 3 0 1 22
13 10 10 11 53 95 133 133 115 638 9%
Calendar Year
0
120
120 2%
Subtotal
[Golf Courses"'Z�
(Estimated using 2020calendar year volue
Gray'sCrossing°
Estimated
(Served by TDPUD and included in the irreported pumping)
Old Greenwood
Estimated
(Served by TDPUD and included in their reported pumping)
Ponderosa (9-hole Course)
Estimated
(Private wells not operated by TDPUD, monthly pumping not available)
Coyote Moon
Estimated
(Served by TDPUD and included in their reported pumping)
Schaffer's Mills
Estimated
Lahontans
Estimated
Northsta rs
Estimated
Martis Camps
Estimated
Tahoe Donner
Estimated
(component of demand provided by TDPUD from wells in basin)
'Values reported in gallons and converted to acre-feet
Values reported in million gallons and converted to acre-feet
3Estimated and obtained from Annual Inventoryof Water Use Lake Tahoe &Truckee River Basins Calendar Year 2020
°Groundwater use already accounted forin TDPUD reported pumping and not included in golfcourse demand subtotal
sGroundwater use not currently available, used 2020 values as surrogate.
Calendar Year
179
295
4
295
232
311
195
330
242
Total 7,155
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 19
Table 2 Groundwater Pumping for Water Year 2020 - 2021 (values in acre-feet)
2020
2021
Annual
Metered
Agency
Estimated
Oct
Nov
Dec
Jan
Feb
Mar
Apr May
Jun
Jul
AugSep
Total Percent
Public Utility Water Purveyors 1
Truckee -Donner PUD
Potable
Water Year
1. Airport Well
Metered
0
0
0
0
0
7
38
46
47
52
67
49
306
2. Martis Valley Well
Metered
199
120
123
135
98
92
110
132
197
157
139
132
1,635
3. South Side Well
Metered
0
0
0
0
0
0
0
0
0
0
0
0
0
4. Glenshire Dr Well
Metered
24
18
32
25
53
44
78
134
99
106
33
0
647
S. Hirschdale Well
Metered
1
1
1
1
1
1
1
1
1
1
1
1
10
6. Prosser Annex Well
Metered
18
0
0
0
0
0
17
27
29
27
23
12
153
7. Prosser Heights Well
Metered
13
0
0
0
0
7
17
16
17
16
17
9
111
8. Sanders Well
Metered
32
0
0
0
0
11
34
33
34
30
26
0
200
9. Prosser Village Well
Metered
68
64
40
54
44
39
50
80
102
67
76
41
728
10. Northside Well
Metered
0
0
0
0
0
0
0
14
20
20
13
0
68
11. Old Greenwood Well
Metered
42
42
53
34
59
54
66
86
99
99
85
37
756
12. Well 20
Metered
11
0
0
0
0
3
13
18
20
19
14
6
104
13. "A" Well
Metered
0
0
0
0
0
0
0
0
0
0
0
0
0
Non Potable
14. Fibreboard Well
Metered
33
0
0
0
0
45
78
106
117
89
78
23
568
15. Donner Creek Well
Metered
16
0
0
0
0
6
39
49
55
44
30
10
248
16. Southside Well #1
Metered
1
1
0
0
0
0
0
1
1
1
0
0
5
Subtotal
458
246
249
249
255
309
542
742
839
726
604
320
5,539 72%
Commu
1111K.-
Northstar C.S.D.
Water Year
TH-1
Metered
8
0
0
0
0
2
1
15
5
2
20
17
72
TH-2
Metered
22
5
1
7
0
0
0
9
41
51
25
20
180
Well
Metered
13
0
0
0
0
0
0
13
41
38
39
33
178
Well
Metered
18
8
11
9
8
7
9
32
23
38
42
40
244
Well
Metered
3
1
1
1
1
1
1
3
4
3
0
1
22
Subtotal
64
15
13
17
9
10
12
72
114
133
127
112
696 9%
lNon-Community Water Purveyors3'2 N
(Estimated using 2021 calendar year
values.)
_
Calendar Year
Hobart Work Centers
Estimated
0
Aggregates Martis Valleys
Estimated
120
Subtotal
120 2%
Golf Courses3'Z
(Estimated using 2021 calendar year value
Calendar Year
Gray'sCrossing°
Estimated
(Served by TDPUD and included in their reported pumping)
179
Old Greenwood
Estimated
(Served by TDPUD and included in their reported pumping)
295
Ponderosa (9-hole Course)
Estimated
(Private wells not operated by TDPUD, monthly pumping not available)
4
Coyote Moon
Estimated
(Served by TDPUD and included in their reported pumping)
295
Schaffer's Mills
Estimated
232
Lahontans
Estimated
311
Northsta rs
Estimated
195
Martis Camps
Estimated
330
Tahoe Donner
Estimated
(component of demand provided by TDPUD from wells in basin)
242
Total 7,669
'Values reported in gallons and converted to acre-feet
Values reported in million gallons and converted to acre-feet
3Estimated and obtained from Annual Inventoryof Water Use Lake Tahoe &Truckee River Basins Calendar Year 2020
°Groundwater use already accounted forin TDPUD reported pumping and not included in golfcourse demand subtotal
sGroundwater use not currently available, used 2020 values as surrogate.
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 20
Figure 10. Martis Valley Groundwater Basin Locations of Groundwater Extractions
y ° re err 'rc •!
k
Boca
ProssLr NEVADA
M .Y�r �rarr� I
Hirschdala
s h- Prosser I r c
Village ✓ui r t
f Prosser Annex Well
I — Tahoe Donner
�7 he,Golf Club at I ,
r Prosser G ray's Crossing Old Greenwood
Heights 41—
E Old Greenwood I I TDPUD Municipal
T kee L_._ __1 I Well
— —" " Fibreboard T
- j Golf Club Sanders Well Glenshire
• t Coyote Moonlq� et Drive Aggregates Northstar (NCSD)
11 Truckee ttiv Martin
j Northside Iro `� ee Martin ,Valley STZ) Municipal Well
_f Valley Well
l Goff Course
oa
Ponder— — I (General Well
g 5outhside ; '�. YYY L� is c
Dnnner Lake Donner Creek p -- ----- — --- --- f Location)
`------�-� / Airport ----- ('re ake IVEVADACOUIVTY _—_— _ --
o -----' __ — — — —--- --.o' -----PLACER COUNTY
Non -Community
I (General Well
-----`-- Location)
Wt'ast ;fax 1
V Situ Q d, . * r Schaffer's Mill THi � Scale of Extraction
Magnitude
} Well 31*
CNell1 N�orthstar's T
Wells Extracting
Well2 If Course
Y d�
Club I >2000 AF per Water
Mortis Year
Camp Lahontan
Club Golf Club Big Spring
s
o 9 `�. I Wells Extracting
u rt >400 AF per Water
Year
I
r� c Wells Extracting
o C
<400 AF per Water
cree I Year
0
Resort F = Creeks and Rivers
d 'r I
e i Mantis Valley
`creE,k a Groundwater Basin
ni I
Deep Creek
County Boundary
9
o N Martin Valley Annual Report MARTIS VALLEY GROUNDWATER BASIN
2 1 0 2 Water Year 2020 and 2021
W F Nevada and Placer Counties, California E LOCATIONS OF GROUNDWATER EXTRACTIONS
MilesTruckee-Qonner Public Utility Qistrict I Consultants APRIL 2022 FIGURE 10
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 21
[This page intentionally left blank.]
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 22
Figure 11. Martis Valley Groundwater Basin Community Water System Monthly Pumping Totals
900
--*-- TDPUD Groundwater Production
t NorthstarC.S.D. Groundwater Production
' .. •� TDPUD Water Year Totals WY 2020
800 1 • • •� NorthStar C.S.D. Water Year Tctals
WY 2018 5083 AF
WY 2016 WY 2017 4824 AF
4668 AF 4519 AF / " • " �' WY 2019
700 4••+••• 4411AF
'••••••s 4 0 0 * & 0
c
0
> 500
200
WY 2016
100 522 AF
WY 2017 WY 2018
579 AF
455 AF
��' a•••s
••••s;01
WY 2019 WY 2020
497 AF 638 AF
WY 2021
5453 AF
,•r••aA*'
WY 2021
741 AF
y� yh y<1 lb y<1 y( y�b y(o �0 y'1 y11 yA �'1y°) y°' yA ya5 .y0 �O ,LO ti0 by L'y Ly .yry IL
Note: Monthly pumping totals shown at end of each month. Month - Year
6000
4000
Total
Water
Year
Pumping
3000 by Entity
(Acre Feet
per
Water
Year)
2000
1000
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 23
[This page intentionally left blank.]
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 24
4. Surface Water Diversions
Although the Truckee River and multiple tributaries course throughout the MVGB, surface water
constitutes less than one percent of Basin water supply. The total surface water diverted for use is about
450 AF in 2020 and 2021, but not all was diverted within the MVGB. Estimated surface water diversions
are listed in Tables 3 and 4 for WYs 2020 and 2021, respectively. Water diversions for 2021 will be
updated when the 2021 TROA annual report is released in 2022.
NCSD has water rights to use water from Big Springs, which is located outside the Basin but within the
watershed as shown on Figure 11. Northstar Resort uses water from the spring, primarily for snowmaking.
A portion of this water supplies recharge to the Basin aquifer by storing water as snow, which later melts,
becomes runoff, and infiltrates into the Basin. Water from the spring is also used in the Basin, at the
Northstar golf course, along with other commercial and domestic uses. The amount of groundwater
recharge attributable to surface water from Big Springs cannot be quantified at this time.
A second surface water source, from within the MVGB, is used for irrigation at the Ponderosa Golf
Course, but its diversion point is unidentified. Some deep percolation from turf irrigation also provides
groundwater recharge within the MVGB.
Table 3 Surface Water Usage Reported for Water Year 2019-2020 (values in acre-feet)
2019 1 2020 1
Annual
Metered
Agency Estimated Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep
Total
Public Utility Water Purveyors
Truckee -Donner PUD 1 Metered 0 0 0 0 0 0 0 0 0 0 0 0
0
Subtotal
0
,Community Water Purveyors �0 calendar year values
Northstar C.S.D.' Metered 11 0 24 13 0 0 0 0 0 0 0 1
50
Non-PUD Community Purveyors Estimated
283
Subtotal
333
bon -Community Water Purveyors 2020 calendar year values)
Hobart Work Center Estimated
0
Aggregates Martis Valley Estimated
53
Subtotal
53
olf Cours (2020 calendar year values from Annual Water Use report 2020)
Ponderosa Golf Course Metered
73
Northstar Golf Course (from Big Springs)' Estimated
0
Subtotal
73
Total
4S9
n/a = Not Applicable
1 TDPUD has an allocation of Truckee River flows but does not use it, has no infrastructure to access it, and has no plans to use it.
2 NCSD holds ripariain water rights for use of Big Springs, which is outside of the MVGB. A portion of this water is used for limited municipal use within the MVGB and Northstar Golf Course.
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 25
Table 4 Surface Water Usage Reported for Water Year 2020-2021 (values in acre-feet)
2020 2021
Annual
Metered
Agency
Estimated Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep
Total
,Public Utility Water Purveyors
Truckee -Donner PUD t
Metered 0 0 0 0 0 0 0 0 0 0 0 0
0
Subtotal
0
Community Wate,
(2021 calendar ye
Northstar C.S.D.2,3 (M&I)
Metered 4 14 9 9 0 0 0 0 0 0 0 0
36
Non-PUD Community Purveyors
Estimated (From Non-PUD Community Purveyors)
283
Subtotal
319
[on -Community Water Purveyo
Hobart Work Center
Estimated
0
Aggregates Martis Valley3
Estimated
53
Subtotal
53
Golf Course
(2021 calendar year values Estimated from Annual Water Use report 2020)
Ponderosa Golf Course3
Estimated
73
Northstar Golf Course (from Big Springs) 2,3
Estimated
0
Subtotal
73
Total
445
n/a = Not Applicable
'TDPUD has an allocation of Truckee River flows but
does not use it, has no infrastructure to access it, and has no plans to use it.
z NCSD holds ripariain water rights for use of Big Springs,
which is outside of the MVGB. A portion of this water is used for limited municipal use within the MVGB and Northstar Golf Course.
3 2021 values not reported at this time.
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 26
5. Groundwater Recharge
Wastewater is exported from the North Lake Tahoe area and is sent to the T-TSA water treatment plant,
located in the MVGB. Total estimated monthly wastewater imports to the MVGB from areas outside the
Basin for the past 2 water years, as well as metered wastewater (weir) derived from within the MVGB,
from the Truckee Sanitary District (TSD), were provided by T-TSA and are listed in Tables 5 and 6 for
WYs 2020 and 2021, respectively. About 1,800 AF and 1,700 AF of wastewater was imported into the
MVGB in WYs 2020 and 2021, respectively.
The treated water from the T-TSA is recharged into the MVGB groundwater system through subsurface
leach fields (pipes with holes surrounded by gravel) under permit with the Lahontan Regional Water
Quality Control Board. The locations of the leach fields are shown on Figure 1. About 3,750 AF of treated
water was recharged into the MVGB in both WYs 2020 and 2021. Wastewater from TSD is partially
derived from groundwater pumping within the MVGB and partially offset impacts of local pumping near
the Truckee River.
Table 5 Estimated Groundwater Recharge from T-TSA for Water Year 2019 - 2020 acre-feet
2019 2020
Annual
Tahoe -Truckee Sanitary Agency Metered
(T-TSA) Sources of Inflows 1 Estimated Oct Nov Dec Jan Feb Mar Air May Jun
Jul Aug Sep
WY Total
Lake Tahoe Area (Imported water) Estimated 86 80 162 156 148 145 155 148 159
200 182 152
1,773
Truckee Sanitary District (TSD) Metered 193 179 208 176 142 113 136 153 170
198 161 142
1,970
Total
3,743
1 Deliveries to treatment facility from outside the MVGB provided by T-TSA and are converted from million gallons to acre-feet
2 Metered readings from Granite Flats used to calculate imported wastewater from Lake Tahoe area
Table 6 Estimated Groundwater Recharge from T-TSA for Water Year 2020 - 2021 (acre-feet)
2020 2021
1
Annual
Tahoe -Truckee Sanitary Agency Actual
(T-TSA) Sources of Inflows 1 Estimated Oct Nov Dec Jan Feb Mar Apr May Jun
Jul Aug Sep
WY Total
Lake Tahoe Area (Imported water) Estimated 143 137 138 140 149 159 144 129 146
178 126 88
1,677
Truckee Sanitary District (TSD) Metered 125 123 159 200 181 197 186 178 198
232 172 143
2,093
Total
3,770
1 Deliveries to treatment facility from outside the MVGB provided by T-TSA and are converted from million gallons to acre-feet
2 Metered readings from Granite Flats used to calculate imported wastewater from Lake Tahoe area
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 27
6. Total Water Use
The total estimated groundwater and surface water use in the MVGB by sector is summarized in
Table 7. Over 90 percent of the water use was provided from groundwater, with a total water use of
7,155 AF and 7,669 AF in 2020 and 2021, respectively. About one-half of the groundwater pumped was
returned to the Basin after being treated by T-TSA.
Table 7 Total Water Use for Water Years 2020 & 2021 (acre -
Water Use Sector
2020
2021
Municipal and Industrial (M&I)
6,227
6,727
Groundwater Metered
5,721
6,235
Groundwater Estimated
120
120
Surface Water Metered
50
36
Surface Water Estimated
336
336
Golf Courses
1,387
1,387
Groundwater Estimated
1,314
1,314
Surface Water Estimated
73
73
Subtotal Groundwater
7,155
7,669
Subtotal Surface Water
459
445
Total Water Use
7,614
8,114
T-TSA Groundwater Recharge
3,743
3,770
Total
3,871
4,344
Note: Only includes water sources in MVGB, see Tables 3 and 4 and does not include evapotranspiration from native vegetation.
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 28
7. Change in Groundwater Storage
An empirical approach was used to calculate change in storage using spring groundwater elevation
contours for 2016 through 2021. The spring contour surfaces were then subtracted to produce water level
change distributions for the last two WYs. The use of spring -to -spring water level differences was deemed
to be the most appropriate when assessing ambient groundwater conditions, because it has less influence
of temporal, localized changes due to pumping adjacent to monitoring wells.
Figures 12 and 13 spatially show the estimated groundwater elevation changes (current year elevations
subtracted from previous year elevations). Portions of the Basin (northwest, southwest, and southeast
corners) with no groundwater level monitoring wells were not contoured. According to DWR files (DWR,
2022) there are no irrigation, municipal or domestic wells in the northwest and southwest corners of the
Basin. In the southwest corner there are four domestic wells but their logs show that they encountered
lava flows and ash layers, and no sediments so it is unknown whether these wells would provide
representative groundwater levels with the rest of the Basin.
Change in storage estimates are dependent upon the assumed specific yield (the percent of sediments with
pore space that contains water that can be drained by gravity) or storage coefficient (similar to specific
yield but used when aquifers are more confined as is typical with depth) of the aquifer formation. Given
the complex and often interbedded nature of the MVGB aquifer system, an average of depth storage
coefficients (ranging from 0.1— 0.05) were used for the analysis. The results and input values are presented
in Table 8. Groundwater in storage in the MVGB decreased in both WY 2020 and 2021. Most of the
change in storage is likely due to the reduced groundwater recharge due to the drought conditions with
the greatest differences being located near the highest density of pumping. The lack of recharge is
evidenced by the groundwater extractions being within 2,000 AF of the change in storage estimates.
Table 8
Estimated Change in Storage
Basin Area Used Average
Estimated
Time Periods for
1 Groundwater Average Storage
Change in
Groundwater Level
in Analysis
Level Change Coefficients
Storage
Elevation Comparisons
(acres) (feet)
(AF)
Spring 2019 - Spring 2020
24,500 -5.45 0.075
-10,007
Spring 2020 - Spring 2021
24,500 -3.72 0.075
-6,841
Total Change 2020 and 2021 WYs
-16,848
i Basin Area limited to extent of
MVGB with groundwater elevation data to limit interpolation error
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 29
Figure 12. Martis Valley Groundwater Basin Change in Groundwater Elevation, Spring 2019-Spring 2020
n
a r ,fir
� � v
------------------------
-I Miles
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s'-
n �
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Well 2
'lr �
Martis Valley Annual Report
Water Year 2020 and 2021
Nevada and Placer Counties, California
Truckee Donner Public Utility District
L_J r
_ TDPUD Municipal
Well
4.
� Northstar (NCSD)
Municipal Well
Monitoring Well
r
Golf Course
✓�Cl. Change in
y Groundwater
' — — Elevation (feet)
Spring 2019 -
_ Spring 2020
-2
-4
l -6
n -80
-12
-14
-16
-18
Martis Valley
Groundwater Basin
r I County Boundary
MARTIS VALLEY GROUNDWATER BASIN
CHANGE IN GROUNDWATER ELEVATION
SPRING 2019 TO SPRING 2020
F
G L I Consultants APRIL2022
u
FIGURE 12
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 30
Figure 13. Martis Valley Groundwater Basin Change in Groundwater Elevation, Spring 2020-Spring 2021
-- Dorrrrer ],uke —
s `
a
.4
Roca
�18N16E22H0701-M
-2.1
ro
enoir
18
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�« o Golf Course
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17N16E11F001tM NTH-F 6'reboard�
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orris
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-
- ---------------- ----- ---- PLACER COUNTY
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Spring 2020 -
1M
Spring 2021
"� } $
6
4
2
t E 0
I
` y _ All" - I -2
A i
jl -4
----------------------------i 6
I
-10
I
Z -12
-14
— -16
-18
-20
-22
\ L
-24
— — Martis Valley
Groundwater Basin
County Boundary
" Martis Valley Annual Report MARTIS VALLEY GROUNDWATER BASIN
2 1 0 2 Water Year 2020 and 2021 CHANGE IN GROUNDWATER ELEVATION
W E Nevada and Placer Counties, California SPRING 2020 TO SPRING 2021
Miles GE1s Truckee Donner Public Utility District Consultants APRIL 2022 FIGURE 13
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 31
Historic trends in the estimated annual and cumulative change of groundwater in storage, along with water
year type and annual groundwater use, are shown on Figure 14. Storage change and groundwater use
estimates prior to WY 2017 were derived from previous analyses. Over the last 2 WYs, groundwater in
storage decreased by about 17,000 AF as a result of 2 years of dry conditions resulting in less recharge
and with increased pumping. For perspective, the Basin has approximately 484,000 AF in storage, so the
overall change is relatively small (about 3.5% over the 2-year period) in comparison to the total water
stored in the Basin.
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 32
Figure 14. Change in Storage and Groundwater Use
600,000
500,000
400,000
aj
V
a7
CM 300,000
r�
t
U
a1
bA
[0
O
200,000
a�
3
s=
0
0
C7 100,000
Estimated Cumulative Storage Charge
tEstimate d Annual Storage Change
Wet
Above Normal
Below Normal
Dry
(Estimated Groundwater Use
Change -in -Storage
pre-2016 from Water
Budget Calculations
0
■
-100 000
Change -in Storage 2016to
2021 calculatedfrom
groundwater contour map
differences
14,000
12,000
n
10,00o
m
G)
m
x
m
6,000 0
0
V7
4,000 r;
2,000
0
N ro �t Ln CO t• 00 an O r-I N rn �t Ln CO r� 00 67 O r-I N
O O O O O O O O r-I r-I r-I r-I r-I r-I r-I r-I r-I r-I N N N
O O O O O O O O O O O O O O O O O O O O O
N N N N N N N N N N N N N N N N N N N N N
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 33
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Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 34
8. Groundwater Management Activities
The MVGB Agencies continue to invest in the stewardship of the Basin and practicing of adaptive
management to proactively ensure that the Basin operates within its sustainable yield. This includes
frequent monitoring of key data points and interactions with local stakeholders' meetings.
The most significant management action has been the voluntary implementation of monthly monitoring
of groundwater levels for all wells in the CASGEM program. This proactive move to monthly monitoring
over 5 years ago and well before the mandate was, in part, to investigate and address uncertainties in
seasonal variations. Without this proactive change the lower groundwater levels during the summer
months noted in WY 2020 and 2021 would not have been detected. The results and trends from this
improved monitoring program are presented in this report, and both TDPUD and NCSD, who are
responsible for the monitoring, intend to continue this monthly monitoring going forward as an MVGB
adaptive management strategy.
The MVGB Agencies continue to interact with local environmental interests and MVGB stakeholders to
provide information and hear concerns. Primarily, this has been done by the participation in the Truckee
River Basin Working Group (TRBWG). The TRBWG was formed with the passage of the TROA 20 years
ago and has been strengthened with the support of the newly formed DWR-TROA division. The TRBWG
is comprised of the California stakeholders in the river watershed including water purveyors, local
governments, environmental interests, recreational interests, DWR, California Department of Fish and
Wildlife, United States Forest Service, and others.
The MVGB Agencies shared the findings from the 2018 and 2019 Annual Report with stakeholders and
are planning to share this report and discuss the findings in the near future.
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 35
9. Conclusions
Groundwater levels decreased in the MVGB through WYs 2020 and 2021 in response to drought
conditions and increased pumping. Groundwater levels in most monitoring wells have remained above
their respective historic low levels when compared to historic spring and fall levels. Because of more
frequent monthly monitoring, three wells reported groundwater levels that were lower than previously
measured levels. The monthly monitoring also showed groundwater levels quickly recovered, indicating
the lower groundwater levels were a localized effect due to pumping.
Groundwater pumping increased by about 10 percent, averaging about 800 AF, during these two water
years. Most of the increase was north of the Truckee River. In response to the increased groundwater use
in this area a pumping depression formed that extended beneath the river. Because of the drought
conditions the pumping depression did not refill during the winter months. The pumping depression may
have increased surface water depletion from the Truckee River but any depletion was offset by recharge
from the T-TSA facility, which contributed to approximately 50 percent of all of the groundwater pumped
in the Basin.
Historic low precipitation and higher groundwater use in WY 2020 and 2021 resulted in an overall
decrease in groundwater storage, similar to other northern California groundwater basins. During the 2-
year period, groundwater in storage decreased by about 17,000 AF, or about 3.5 percent of the total storage
in the Basin. Although the Basin had a decrease in groundwater storage this is considered to be part of a
natural cycle, and as long as groundwater levels recover in future years, the Basin would still be considered
sustainable.
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 36
10. References
Brown and Caldwell, 2013. Martis Valley Groundwater Management Plan (GMP).
California Department of Water Resources (DWR), 2016. California's Groundwater. Bulletin 118-
Interim Update 2016.
California Department of Water Resources (DWR), 2021. Annual Inventory of Water Use, Lake Tahoe
and Truckee River Basins, Calendar Year 2020.
California Department of Water Resources (DWR), September 2021. Water Year 2021: An Extreme
Year.
California Department of Water Resources (DWR), accessed May 2022. California Groundwater Live.
htlps://sgma.water.ca.gov/CaIGWLive/#wells
GEI, March 2018. Annual Report for the Martis Valley Groundwater Basin, Sustainable Groundwater
Management Act Alternative Submittal, Water Years 2016 and 2017.
GEI, January 2021. Annual Report for the Martis Valley Groundwater Basin, Water Years 2018 and
2019.
Truckee Donner Public Utility District (TDPUD), December 2016. Martis Valley Groundwater Basin
Sustainable Groundwater Management Act Alternative Submittal.
Martis Valley Groundwater Basin Annual Report GEI Consultants, Inc.
Water Years 2020 and 2021 37
Attachment A. Monitoring Well Hydrographs
Water Years 2020 and 2021 GEI Consultants, Inc.
Annual Report for Martis Valley Groundwater Basin Alternative Submittal
5,950
5,900
5,850
5,800
c
0
a,
w 5,750
v
U
7
N
- 5,700
5,650
5,600
5,550
17N16E11F001M
0) o rI N m a Ln �o rl 00 0) O rI N m a Ln �o rl 00 m o rI N m v m a rl 00 rn O c-I
00 Ql Ql 0) Ql 0) Ql Ql 0) Ql 0) O O O O O O O O O O r-I r-I r-I r-I r-I r-I r-I r-I 1-I 1-I N N
O m m O m O m m 0) Ql 0) O O O O O O O O O O O O O O O O O O O O O O
rl i--I i--I r-I i--I r-I 1-I 1-I r-I 1-I r-I N N N N N N N N N N N N N N N N N N N N N N
O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O
ci ci ci ci ci ci ci ci ci ci ci ci ci ci ci -4 -4 ci ci ci ci ci ci ci ci ci ci ci ci ci ci ci ci
Water Year
5,950
5,900
5,850
E
cp 5,800
+f
c
0
w 5,750
v
U
i
7
N
au 5,700
5,650
5,600
5,550
17N16E13K001M
0) o N c1i rm a Ln �o rl 00 0) O N c1i rm a Ln �o rl 00 m O N c1i rm v in �o rl 00 rn O N
00 Q1 Q1 0) Q1 0) Q1 91 O 91 O O O O O O O O O O O c-i 1-1 c-i 1-1 1-1 c-i 1-1 c-i 1-1 1-1 N N
O Ql Ql O Ql O Ql Ql 0) Ql 0) O O O O O O O O O O O O O O O O O O O O O O
r-I i--i i--i c-I i--i c-I 1-1 1-1 c-I 1-1 r-i N N N N N N N N N N N N N N N N N N N N N N
O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O
Water Year
17N16E13K003M
5,950
5,900
5,850
E
rp 5,800
+f
c
0
w 5,750
v
U
i
7
N
au 5,700
5,650
5,600 ——
WSE
Historical Low Level
5,550
0) o rI N m a Ln �D r` 00 0) O rI N m a Ln �D r` 00 m o rI N m v m w r` 00 rn O c4
00 Q1 Q1 0) Q1 0) Q1 Q1 0) Q1 0) O O O O O O O O O O c 1 r-I c 1 r 1 r 1 r-I r-I r-I 1-I 1-I N N
O m m O m O m m 0) Ql 0) O O O O O O O O O O O O O O O O O O O O O O
N N N N N N N N N N N N N N N N N N N N N N
O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O
ci ci ci ci ci ci ci ci ci ci ci ci ci ci ci -4 -4 ci ci ci ci ci ci ci ci ci 1-I ci ci ci ci ci ci
Water Year
5,950
5,900
5,850
E
rp 5,800
+f
c
0
w 5,750
v
U
i
7
N
au 5,700
5,650
5,600
5,550
17N16E17F002M
GS Elevation
WSE
Historical Low Level
m o N c1i ro a Ln �D r` 00 m O N cIj ro a Ln �D r` 00 m O N cIj ro v in �D r` 00 rn O N
00 Cn of of of of of of of of of O O O O O O O O O O c-i 1-1 c-i 1-1 1-1 c-i 1-1 c-i 1-1 1-1 N N
of of of of of of of of of of of O O O O O O O O O O O O O O O O O O O O O O
1 i-q i-q r-i i-q r-i 1-1 1-1 c-I 1-1 r-i N N N N N N N N N N N N N N N N N N N N N N
O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O
Water Year
5,950
5,900
5,850
E
rp 5,800
+f
c
0
w 5,750
v
U
Ln
au 5,700
5,650
5,600
5,550
17N17E05D001M
GS Elevation
WSE
Historical Low Level
0) O 1-I N m IzT Ln LD I, 00 0) O -4 N m IZT Ln LD I" 00 m O -1 N m �t m LD I, 00 m O -4
00 m m 0) m 0) m m O m O O O O O O O O O O O r-I r-I r-I r 1 r 1 r-I r-I r-I 1-I 1-I N N
O m m O m O m m 0) m 0) O O O O O O O O O O O O O O O O O O O O O O
N N N N N N N N N N N N N N N N N N N N N N
O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O
ci ci ci ci ci ci ci ci ci ci ci ci ci ci ci -4 -4 ci ci ci ci ci ci ci ci ci ci ci ci ci ci ci ci
Water Year
5,950
5,900
5,850
E
cp 5,800
+f
c
0
w 5,750
v
U
7
N
au 5,700
5,650
5,600
5,550
17N17E07P001M
0) o rI N m a Ln �o rl 00 0) O rI N m a Ln �o rl 00 m o rI N m v m a rl 00 rn O c-I
00 Ql Ql 0) Ql 0) Ql Ql 0) Ql 0) O O O O O O O O O O r-I r-I r-I r-I r-I r-I r-I r-I 1-I 1-I N N
O m m O m O m m 0) Ql 0) O O O O O O O O O O O O O O O O O O O O O O
rl i--I i--I r-I i--I r-I 1-I 1-I r-I 1-I r-I N N N N N N N N N N N N N N N N N N N N N N
O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O
ci ci ci ci ci ci ci ci ci ci ci ci ci ci ci -4 -4 ci ci ci ci ci ci ci ci ci ci ci ci ci ci ci ci
Water Year
5,950
5,900
5,850
V)
E
rp 5,800
+f
c
0
w 5,750
v
U
i
7
N
au 5,700
5,650
5,600
5,550
17N17E18C001M
GS Elevation
WSE
Historical Low Level
m o N rIj rm a Ln �D r` 00 m O N rIj rm a Ln �D r` 00 m O N rIj rm v Ln �D r` 00 rn O N
00 Cn Cn O 91 O 91 91 O 91 O O O O O O O O O O O c-i c-I c-i c-I c-I I-q c-I c-i c-I c-I N N
O Ql Ql O Ql O Ql Ql O Ql O O O O O O O O O O O O O O O O O O O O O O O
r-I i-q i-q r-i i-q r-i 1-1 1-1 c-I 1-1 r-i N N N N N N N N N N N N N N N N N N N N N N
O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O
Water Year
5,950
5,900
5,850
E
cp 5,800
+f
c
0
w 5,750
v
U
7
N
au 5,700
5,650
5,600
5,550
17N17E19K001M
0) o rI N m a Ln �o rl 00 0) O rI N m a Ln �o rl 00 m o rI N m v m a rl 00 rn O c-I
00 Ql Ql 0) Ql 0) Ql Ql 0) Ql 0) O O O O O O O O O O r-I r-I r-I r-I r-I r-I r-I r-I 1-I 1-I N N
O m m O m O m m 0) Ql 0) O O O O O O O O O O O O O O O O O O O O O O
rl i--I i--I r-I i--I r-I 1-I 1-I r-I 1-I r-I N N N N N N N N N N N N N N N N N N N N N N
O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O
ci ci ci ci ci ci ci ci ci ci ci ci ci ci ci -4 -4 ci ci ci ci ci ci ci ci ci ci ci ci ci ci ci ci
Water Year
5,950
5,900
5,850
E
cp 5,800
+f
c
0
w 5,750
v
U
7
N
au 5,700
5,650
5,600
5,550
17N17E29B001M
0) o rI N m a Ln �o rl 00 0) O rI N m a Ln �o rl 00 m o rI N m v m a rl 00 rn O c-I
00 Ql Ql 0) Ql 0) Ql Ql 0) Ql 0) O O O O O O O O O O r-I r-I r-I r-I r-I r-I r-I r-I 1-I 1-I N N
O m m O m O m m 0) Ql 0) O O O O O O O O O O O O O O O O O O O O O O
rl i--I i--I r-I i--I r-I 1-I 1-I r-I 1-I r-I N N N N N N N N N N N N N N N N N N N N N N
O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O
ci ci ci ci ci ci ci ci ci ci ci ci ci ci ci -4 -4 ci ci ci ci ci ci ci ci ci ci ci ci ci ci ci ci
Water Year
5,950
5,900
5,850
E
rp 5,800
+f
c
0
w 5,750
v
U
i
7
N
au 5,700
5,650
5,600
5,550
18N16E22H001M
- GS Elevation
WSE
Historical Low Level
0) O 1-I N m IzT Ln LD I, 00 0) O -4 N m IZT Ln LD I" 00 m O -1 N m �t m LD I, 00 m O -4
00 m m 0) m 0) m m O m O O O O O O O O O O O r-I r-I r-I r-I r-I r-I r-I r-I 1-I 1-I N N
O m m O m O m m 0) m 0) O O O O O O O O O O O O O O O O O O O O O O
r-I i--I i--I r-I i--I r-I 1-I 1-I r-I 1-I r-I N N N N N N N N N N N N N N N N N N N N N N
O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O
ci ci ci ci ci ci ci ci ci ci ci ci ci ci ci -4 -4 ci ci ci ci ci ci ci ci ci ci ci ci ci ci ci ci
Water Year
5,950
5,900
5,850
E
rp 5,800
+f
c
0
w 5,750
v
U
i
7
N
au 5,700
5,650
5,600
5,550
18N17E33L001M
GS Elevation
WSE —
I I I I
Historical Low Level
m o N r1i rm a Ln �D r` 00 m O N rIj rm a Ln �D r` 00 m O N rIj rm v in �D r` 00 rn O N
00 Q1 Q1 O Q1 O Q1 91 O 91 O O O O O O O O O O O c-i 1-1 c-i 1-1 1-1 c-i 1-1 c-i 1-1 1-1 N N
O Ql Ql O Ql O Ql Ql O Ql O O O O O O O O O O O O O O O O O O O O O O O
r-I i--i i--i c-I i--i c-I 1-1 1-1 c-I 1-1 r-i N N N N N N N N N N N N N N N N N N N N N N
O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O
Water Year
Fibreboard (TH)
5,950
5,900
5,850
E
ca 5,800
c
0
w 5,750
v
U
7
N
a; 5,700
5,650
GS Elevation
5,600
WSE
Historical Low Level
5,550
10/2010 10/2011 10/2012 10/2013 10/2014 10/2015 10/2016 10/2017 10/2018 10/2019 10/2020 10/2021
Water Year
Martis Valley (TH)
5,950
5,900
5,850
E
ca 5,800
c
0
w 5,750
v
U
7
N
a; 5,700
5,650
5,600
5,550
10/2010 10/2011 10/2012 10/2013 10/2014 10/2015 10/2016 10/2017 10/2018 10/2019 10/2020 10/2021
Water Year
Prosser Village (TH)
5,950
5,900
5,850
E
ca 5,800
c
0
w 5,750
v
U
7
N
a; 5,700
5,650
5,600
5,550
10/2010 10/2011 10/2012 10/2013 10/2014 10/2015 10/2016 10/2017 10/2018 10/2019 10/2020 10/2021
Water Year