3/5/2019 Greater Kaweah GSA Technical Advisory Committee Meeting - - PDF document

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Greater Kaweah GSA Technical Advisory Committee Meeting

Tuesday, March 5, 2019

www.GreaterKaweahGSA.org

ITEM 2: ANNOUNCEMENTS ITEM 3: MINUTES

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ITEM 4: Monitoring Network Chapter

• The Monitoring Network Chapter consists of 3 parts:

– A description of existing monitoring programs and the data collected – Identification of data gaps with respect to the requirements of SGMA – Plans to address the data gaps identified in the 2020 GSP

• Use of Existing Monitoring Programs
• Development of a SGMA-Compliant Monitoring Network

ITEM 4: Monitoring Network Chapter

• SGMA requires that a coordinated, subbasin wide

monitoring network be developed and used for the evaluation of the subbasin’s performance in the Sustainability Indicators defined by SGMA.

– SGMA allows for the use of Representative Monitoring Sites and Proxy Measurements for evaluating SI performance.

ITEM 4: Overview of Existing Monitoring

The following have been identified at the Subbasin level:

• Existing groundwater level monitoring programs
• Existing groundwater quality programs
• Existing land surface subsidence monitoring, and
• Existing surface water flow monitoring

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ITEM 4: Existing Groundwater Level Monitoring

Agency Frequency of Monitoring Period of Record for Monitoring Types of Wells Monitored Number of Wells (Approx.) Known Completion of Wells Monitored Number of Dual Completion Wells Automated Monitoring Alta ID Monthly to bi- annually 1921 – 2011 Ag/ Domestic 5 None None Unknown Bureau of Reclamation Monthly to bi- annually 1924 – 2008 Unknown 118 15 Unknown Unknown Cal Water (City of Visalia) Monthly 1971 – 2018 Municipal 104 None Unknown Unknown Dept of Water Resources Bi-annually 1930 – 2016 Various 182 7 Unknown Unknown Exeter ID Bi-annually 1963 – 2016 Agricultural 40 None Unknown Unknown KDWCD Monthly to Bi- Annually 1919 – 2018 Agricultural 425 30 4 Unknown Kings County Water District Bi-annually 2011 – 2018 Agricultural 6 3 Unknown Unknown Lakeside ID Bi-annually 2012 – 2017 Agricultural 33 2 Unknown Unknown

ITEM 4: Groundwater Level Data Gaps

• There are a total of 14 Dedicated Groundwater Level

Monitoring Wells throughout the entire Subbasin.

• An additional 6 wells are proposed with the TSS funding

application at DWR, bringing the total to 20 wells.

– The desired density of wells, according the DWR’s BMP on Monitoring Networks ranges between 4 and 10 wells per 100

• sq. miles.
• Between 28 wells and 70 wells for the entire Kaweah Subbasin.

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ITEM 4: Groundwater Level Data Gaps

Water Quality Monitoring Program Participating Agencies Parameters Frequency AB 3030 and SB 1938 Exeter ID, KDWCD, Lakeside ID Ag suitability analysis (limited suite of general minerals) Annually to Once Every 3 Years CA SDWIS City of Exeter, City of Farmersville, Ivanhoe Public Utility District, City of Woodlake All Title 22 regulated constituents Title 22 General Minerals & Metals, every 3 years Nitrates, annually (quartertlyif ≥ 5 ppm) VOCs and SOCs, every 3 years Uranium, dependent on historical sampling. Varies between 1 sample every 3 (when ≥ 10 pCi/L), 6 (when < 10 pCi/L) or 9 (when no historical detection) years CV-SALTS Most constituents sampled monthly, quarterly General Minerals from source water and annual General Minerals from waste discharge. Kaweah is a Priority 1 Basin, meaning that management strategies will be initiated in 2019 Dept of Pesticide Regulation (DPR) City of Exeter, City of Farmersville, Ivanhoe Public Utility District, City of Woodlake Pesticides Annual GAMA SWRCB, Central Valley RWQCB, DWR, DPR, NWIS, LLNL Constituents sampled vary by Program Objectives USGS is typically the technical lead in conducting the studies and reporting data The Priority Basin Project performed baseline and trend assessments, sampling 2,900 public and domestic wells statewide. The Domestic Well Project sampled over 180 wells in Tulare County (29 wells were in the Kaweah Subbasin). Irrigated Lands Regulatory Program (IRLP) Kaweah River Watershed Coalition Static Water Level, temperature, pH, electrical conductance, Nitrate as Nitrogen, dissolved Oxygen (Annually) General Minerals suite (every 5 years) Varies; Annually to every 5 years (first samples collected in fall 2018)

ITEM 4: Groundwater Level Data Gaps

• In areas with two aquifer systems, do the existing

monitoring programs identify which aquifer is being monitored?

• Implementation of CV-SALTS should help address areas

beyond municipal and domestic groundwater use.

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ITEM 4: Existing Subsidence Monitoring

Category Monitoring Entity (Entities) Period of Record Historical Monitoring National Geodetic Survey of benchmarks (repeat level surveys) 1926 – 1970 Recent Monitoring National Geodetic Survey of benchmarks (repeat level surveys). Installation and measurement of Deer Creek extensometer (8.5 miles south of Kaweah Subbasin, in the Tule Subbasin) KDWCD Land Surface Elevation Monitoring (local benchmark monitoring network) CGPS data from UNAVCO and CVSRN stations: P056, P566, CRCN, LEMA, and RAPT NASA (InSAR and UAVSAR programs) NGS: 1970 to present 2016 to present CGPS: 2006 to Present (depending on station) NASA: 2006 – 2017 (except for 2011 – 2014)

ITEM 4: Subsidence Data Gaps

• While there is extensive coverage with the KDWCD Land

Surface Elevation Monitoring Stations, the data has only been collected since 2016.

– Continued collection of this data and use of other existing programs, with InSAR imagery, will need to be evaluated in the implementation of SGMA to determine if any additional monitoring is needed.

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ITEM 4: Representative Monitoring Sites

• Can have multiple sites per Management Area
• Can monitor multiple SIs at a Site

ITEM 4: Representative Monitoring Sites

• Criteria for Selection of Representative Monitoring Sites:

– Is there already a dedicated monitoring well at the location? – If not, are there wells of known construction that can be converted to monitoring wells or used for the interim?

• In areas with two aquifer systems, in which system are these wells

completed?

– Is there adequate well density and distribution for the management area? – Is there a good record of hydrology for the well?

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Management Area Concepts Management Area Concepts ITEM 5: Measurement & Monitoring Options

• Options for Flow Measurement were reviewed, along

with vendors to provide equipment for these options.

• Vendors for Groundwater Pumping Measurements:

– Rosemount – PowWow – McCrometer – LandiQ

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ITEM 5: Measurement & Monitoring Options

Vendor Product Accuracy Pros Cons Unit Cost Rosemount 8750 Mag Meter 0.25% - 0.5%

• Proven Record
• Expandable Wireless Network

Capabilities for Remote Communication

• Cost
• Wireless network will be an

add’l cost ~ $3000/unit PowWow +/- 4%

• Inexpensive
• No Add’l Installation Cost
• Bulk Discounts up to ~60%
• Maintains Title 23 Certification

(< 10% error)

• Yearly recurring payments
• No option to add GWL

monitoring instruments to system $500/unit $200-$300/unit on bulk orders McCrometer

• FPI Mag

Meter

• Ultra Mag

Meter 0.5% - 1.0% 0.5%

• Meter installed on Pump
• Multiple Meters can track flow

to individual fields/crops

• Cost
• Add’l installation cost
• May not fit for all

applications

• Add’l cost for network

~$3100/unit LandiQ Remote Sensing

• Used by other districts/GSAs
• No meter installation
• No opportunity to tie-in GWL

monitoring instruments

• Accuracy not a good for

periods shorter than a year

ITEM 6: TECH SERVICES UPDATE

Kaweah Subbasin Activities

• Subbasin Basin Setting Components Report and Numerical Model

– Consultant team is working on the agreed refinements to the report, to be delivered to the GSA managers by March 15th. – Model to be refined with water budget refinements.

• Draft Coordination Agreement discussed at Feb. 20th Subbasin Management

Team Meeting.

• Water Supply Accounting Framework approach has been discussed amongst

the GSAs and with their respective TACs and legal counsel. – Consultants to use the “three buckets” approach to quantify the seepage volumes. – To be used in the Water Supply Accounting chapter for each of the GSPs in the subbasin, once agreed upon by the three GSAs.

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Kaweah Subbasin Activities

• Technical Support Services (TSS) for Monitoring Wells

– A Draft Contract was provided to the GSA Managers by DWR last week – The application is being reviewed in Sacramento to determine:

• When the wells will be drilled,
• If all of the proposed monitoring wells will be funded, and
• If not, how many wells will be funded for the Kaweah Subbasin this time around.
• SMC Development has been happening at the Subbasin Tech Team.

– Refinements requested by the Tech Team are underway, with an anticipated completion date of March 15th.

SMC Thresholds and Objectives – Iterative Process Developed by Stakeholders Informed by technical information including groundwater modeling Basin Setting/Water Budget Refinements Projects and Management Actions GSA Specific Model Simulations

SUBBASIN ACTIVITIES

Groundwater Model Refinement SMC Goal and SI Assessment Complete Basin Setting Chapter

GSP Development Schedule

Groundwater Model Simulations

GSA Deliverable

Define Management Areas Develop Thresholds and Objectives for MAs Water Level Projections Draft Monitoring Network Chapter Complete Monitoring Network Chapter Complete SMC Chapter Jan Feb Mar Apr May Jun Water Supply Accounting Framework Water Supply Accounting Chapter

ITEM 7: GKGSA MEETINGS REPORT

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ITEM 8: Future Agenda Items

• Review of Representative Monitoring Sites for 2020 GSP
• Sustainable Management Criteria

– Review of Minimum Thresholds and Measurable Objectives

• Sustainability Goal and Undesirable Results Definitions