EKI TECHNICAL PRESENTATION #19cosumnes.waterforum.org/.../07/2-Draft_EKI...Presentation_2020-07-… · 15/7/2020 · Draft –For discussion purposes only PROP 68 –ISOTOPIC RECHARGE

Draft – For discussion purposes only

EKI TECHNICAL PRESENTATION #19COSUMNES SUBBASIN GSP DEVELOPMENT

15 JULY 2020COSUMNES SUBBASIN WORKING GROUP / TAC MEETING

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AGENDA ITEM #3 GROUNDWATER SUSTAINABILITY PLAN

TECHNICAL WORK AND PLANNING

¡ Three-month look-ahead (+ Prop 68)

¡ Groundwater Modeling – CoSANA

¡ Prop 68 activities – Field Studies

¡ Monitoring Network Status

¡ Management Areas – Follow up discussion

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GSP - THREE MONTH LOOK AHEAD

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Today

Signed RMW Access Agreements Due Before

11/1/20

Prop 68 Tasks

TM #8: “Water Budget and Preliminary Estimate of Sustainable Yield” - reschedule submission date dependent on completion of model calibration

Well & Land Access

Field Work

CoSANA calibration

TM 10 “Delineation of Management Areas” – reschedule submission date dependent on direction from Working Group


CoSANA MODEL DEVELOPMENT (1 OF 2)

Cosumnes Subbasin Preliminary Calibration Completed¡ First of a three-step process (see Slide 5).¡ “Child Model” of Cosumnes Subbasin

created from CoSANA.¡ Initial calibration included comparisons

between model-calculated and observed/estimated:- Water levels in 84 wells.

- Vertical gradients between formations at seven locations.

- Horizontal gradients across Subbasinboundaries.

- Surface flows in Cosumnes River and creeks.

- Cosumnes River and creek leakage estimates.

- Analytical water budget.4

Mean Error = -6 feet (low)Basin Foothills = -23 feet (low)Basin Plain = 3 feet (high)


þ Step 1: EKI completes preliminary calibration of “Child Model” (completed 7/10/20).

q Step 2: W&C integrates Child Model into CoSANA and completes calibration of entire model.

q Step 3: EKI finalizes CoSANA for the Cosumnes Subbasin.

- Integrate new data from Prop 68 as appropriate.

- Evaluate performance and finalize calibration.

Final model employed to support development of TM #8: “Water Budget and Preliminary Estimate of Sustainable Yield.”

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CoSANA MODEL DEVELOPMENT (2 OF 2)

1st of 3-step process completedCosumnes Subbasin Model

(portion of CoSANA Model)

CoSANA Model

Child Model

CoSANA


PROP 68 SCOPE OF WORK (1 OF 7)

¡ Task 1: Invoicing, Quarterly Reporting, and Grant Administration

¡ Task 2: Project Management

¡ Task 3: Surface Water Advisory Group – CBI/Water Forum

¡ Task 4: Geophysical Investigation – slide 8

¡ Task 5: Isotopic Recharge Characterization Study – slide 9 & 10

¡ Task 6: Groundwater Dependent Ecosystem Verification

¡ Task 7: Voluntary Groundwater Extraction Instrumentation – slide 11

¡ Task 8: Model Refinements

¡ Task 9: Monitoring Well Installation– slide 126


PROP 68 –WORK FLOW FOR FIELD EFFORTS (2 OF 7)

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Access to wells and field sites

• Isotopic recharge characterization study

• Geophysical investigation

• Install voluntary groundwater extraction instrumentation

Convene Surface Water

Advisory Stakeholder

Group (SWAG)

Design Groundwater Dependent Ecosystem (GDE) field investigation

• Install monitoring wells

• Install water level instrumentation

• GDE field verification

Update CoSANA as appropriate

June 2020 July 2020 Aug – Nov 2020 Dec 2020 – Feb 2021

Site access for GDE verification

Moved to July

Mostly Completed

Moved to Aug


PROP 68 – GEOPHYSICAL INVESTIGATION (3 OF 7)¡ Geophysical section lines

– Fieldwork will take place over several sessions¡ Sections CR-2 & CR-3 planned for 7/28 & 7/29

– Three (3) optional sites still require access

– SRCD: 3 CR-2 sites scheduled for 7/28 & 7/29

¡ Sections DC-1,-2 and -3 planned for 7/30 & 7/31– Three (3) sites still require access

– Amador County GMA: DC-3 sites

¡ Geophysical field surveys– tTEM contractor recommended expanding

survey area– Survey will be scheduled once access is

confirmed

¡ Tasks to be completed– GSAs to confirm site access to remaining six

sites 8

Potential tTEM Field Expanded tTEM Field


PROP 68 – ISOTOPIC RECHARGE CHARACTERIZATION STUDY (4 OF 7)

¡ Confirmed access to 22 candidate wells for isotopic sampling – Round 1: Sample pumping wells beginning

week of 7/13

– Round 2: Sample monitoring wells (require additional sampling equipment) mid-August

– Round 3: Sample remaining wells and OHWD TSS well (After installation is completed. Drilling scheduled to begin 7/13)

¡ GSAs will continue to coordinate sampling visits with landowners

9Table of proposed isotope sample sites on next slide


PROP 68 – ISOTOPIC RECHARGE CHARACTERIZATION STUDY (5 OF 7)

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Sample Site Well ID GSA Sampling

Round1 05N06E30E001M Sac. Co. 1

2 06N06E29K001M Sac. Co. 1

3 06N07E14A001M Clay WD 1

4 06N08E15J001M SRCD 1

5 07N08E06N001M OHWD 1

6 07N08E10K002M SRCD 1

7 07N08E16E001M SRCD 1

8 07N08E36B001M SRCD 3

9 ACGMA Bamert Rd MW DAmador Co.

GMA3

10 ACGMA Bamert Rd MW SAmador Co.

GMA3

11 ACGMA CarbondaleAmador Co.

GMA3

Sample Site Well ID GSA Sampling

Round

12 AWA ARM-5Amador Co.

GMA1

13 City of Galt_Industrial Deep Well 22 City of Galt 1

14 City of Galt_Well 14 City of Galt 1

15 City of Galt_Well 20 City of Galt 1

16 Dillard Elementary_DomWell SRCD 1

17 UC obs_X283687 Sac. Co. 3

18 UC obs_X284220 Sac. Co. 3

19 UC obs_X284227 OHWD 3

20/21/22 OHWD TSS OHWD 3


PROP 68 – VOLUNTARY GROUNDWATER EXTRACTION INSTRUMENTATION (6 OF 7)¡ Four sites volunteered

– Photos needed for 1 and 2.

– Photos received for 3 and 4.

¡ Two additional sites needed– Ideally wells to supply aquaculture

and/or almonds/walnuts.

¡ Waiting for construction quotes for meter installation.

¡ Site visits by EKI, well contractor and GSA representative proposed for week of 7/13 or later.

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Network ID GSA Well

Use Land Use Access

1 RMW-WQ9/RMW-ISW7

OHWD Irrigation Vineyard –irrigated drip

Verbal

2 -- GID Irrigation Corn/Alfalfa Verbal

3 -- SRCD Ag-Res

Horse Property:

Pasture/Water Trough/Arenas

Verbal

4 -- SRCD Irrigation Ag-residential Verbal

? ? ? Irrigation Aquaculture None

? ? ? Irrigation Almonds/Walnuts

None


PROP 68 – MONITORING WELL/STREAM GAGE INSTALLATION (7 OF 7)

¡ Stream Gage Locations– Gaging Station 1 – RMG-4/Rooney Dam– Gaging Station 2 – RMG-3/Mahon Dam

¡ Monitoring Well Locations– Well 1

¡ Located near one of the two gaging stations¡ Selection determined primarily by accessibility.

– Well 2¡ Located across Dry Creek from proposed ESJ

monitoring well¡ Replacement for proposed RMW-ISW1

¡ EKI and OHWD / Sac County will finalize proposed locations

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Proposed Stream Gage LocationProposed Monitoring Well Location

Well 1 ?

Well 2


SGMA MONITORING NETWORK STATUS

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GSA

Number of Wells Number of Gauges

WL Rep. Monitoring

Sites

WLConfirmed Accessible(7/8/20)

WQ Rep. Monitoring

Sites

WQConfirmed Accessible(7/8/20)

ISW Rep. Monitoring

Sites

ISWConfirmed Accessible(7/8/20)

ISW Rep. Monitoring

Sites

ISW Confirmed Accessible(7/8/20)

Amador WA1 6 6 5 4 -- -- -- --

City of Galt 1 1 2 2 -- -- -- --

Clay WD 1 1 -- -- -- -- -- --

Galt ID 2 0 1 0 -- -- -- --

OHWD1 1 1 2 2 2 2 3 0

Sac County 3 3 1* 0 4* 2 1 0

SRCD 6* 2 3* 1 1 1 1 01420 14 9 7 5 5 0

1. Includes TSS sites. * May need replacement wells indicates a count that increased from last meeting


DISCUSS PUBLIC WATER SYSTEM OUTREACH ¡ Public Water Systems (PWS) are an

important beneficial user of groundwater in the Cosumnes Subbasin

¡ PWS report water quality data to the Safe Drinking Water Information System (SDWIS) website

¡ Integral to Water Quality monitoring network (i.e., these wells are critical parts of the RMS)

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Public Water System Wells


¡ Domestic well owners are an important beneficial user of groundwater in the Cosumnes Subbasin

¡ When developing Sustainable Management Criteria (SMC) GSAs must consider the “potential effects on the beneficial uses and users of groundwater, on land uses and property interests” (23§CCR 354.26(b)(3))

¡ SRCD & Sacramento County GSAs have begun a more in-depth domestic well survey

¡ Austin Miller from SRCD will discuss his findings and progress

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STATUS OF DOMESTIC PRIVATE WELL SURVEY


SRCD decision on Management Area designation?

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MANAGEMENT AREAs


NEXT STEPS

¡ Continue progress on Prop 68 field activities

¡ Update Representative Monitoring Site list as access is confirmed for proposed wells or for alternative wells selected as substitutes for wells determined inaccessible – remains critical path issue for basin

¡ Sustainable Management Criteria analysis delayed until Representative Monitoring Sites are confirmed

¡ Water Budget estimates delayed until CoSANA calibration process is complete

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Documents

EKI TECHNICAL PRESENTATION #19cosumnes.waterforum.org/.../07/2-Draft_EKI...Presentation_2020-07-… · 15/7/2020 · Draft –For discussion purposes only PROP 68 –ISOTOPIC RECHARGE