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

3/5/2019 Greater Kaweah GSA Technical Advisory Committee Meeting www.GreaterKaweahGSA.org Tuesday, March 5, 2019 ITEM 2: ANNOUNCEMENTS ITEM 3: MINUTES 1

3/5/2019 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 2

3/5/2019 ITEM 4: Existing Groundwater Level Monitoring Period of Number of Known Number of Dual Frequency of Types of Wells Automated Agency Record for Wells Completion of Completion Monitoring Monitored Monitoring Monitoring (Approx.) Wells Monitored Wells Monthly to bi- Alta ID 1921 – 2011 Ag/ Domestic 5 None None Unknown annually Bureau of Monthly to bi- 1924 – 2008 Unknown 118 15 Unknown Unknown Reclamation annually Cal Water (City of Monthly 1971 – 2018 Municipal 104 None Unknown Unknown Visalia) Dept of Water Bi-annually 1930 – 2016 Various 182 7 Unknown Unknown Resources Exeter ID Bi-annually 1963 – 2016 Agricultural 40 None Unknown Unknown Monthly to Bi- KDWCD 1919 – 2018 Agricultural 425 30 4 Unknown Annually Kings County Bi-annually 2011 – 2018 Agricultural 6 3 Unknown Unknown Water District 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. 3

3/5/2019 ITEM 4: Groundwater Level Data Gaps Water Quality Monitoring Participating Agencies Parameters Frequency Program Ag suitability analysis (limited suite of general AB 3030 and SB 1938 Exeter ID, KDWCD, Lakeside ID Annually to Once Every 3 Years minerals) Title 22 General Minerals & Metals, every 3 years Nitrates, annually (quartertlyif ≥ 5 ppm) City of Exeter, City of Farmersville, Ivanhoe Public Utility CA SDWIS All Title 22 regulated constituents VOCs and SOCs, every 3 years District, City of Woodlake 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 Most constituents sampled monthly, quarterly General Minerals from source water and annual General Minerals from waste discharge. CV-SALTS Kaweah is a Priority 1 Basin, meaning that management strategies will be initiated in 2019 Dept of Pesticide Regulation City of Exeter, City of Farmersville, Ivanhoe Public Utility Pesticides Annual (DPR) District, City of Woodlake The Priority Basin Project performed baseline and trend Constituents sampled vary by Program assessments, sampling 2,900 public and domestic wells Objectives statewide. GAMA SWRCB, Central Valley RWQCB, DWR, DPR, NWIS, LLNL USGS is typically the technical lead in The Domestic Well Project sampled over 180 wells in conducting the studies and reporting data Tulare County (29 wells were in the Kaweah Subbasin). Static Water Level, temperature, pH, electrical conductance, Nitrate as Nitrogen, dissolved Irrigated Lands Regulatory Varies; Annually to every 5 years (first samples Kaweah River Watershed Coalition Oxygen (Annually) Program (IRLP) collected in fall 2018) General Minerals suite (every 5 years) 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. 4

3/5/2019 ITEM 4: Existing Subsidence Monitoring Monitoring Entity Category Period of Record (Entities) National Geodetic Survey of Historical Monitoring benchmarks (repeat level 1926 – 1970 surveys) National Geodetic Survey of benchmarks (repeat level surveys). Installation and NGS: 1970 to present measurement of Deer Creek extensometer (8.5 miles south of Kaweah Subbasin, in the Tule Subbasin) KDWCD Land Surface Recent Monitoring Elevation Monitoring (local 2016 to present benchmark monitoring network) CGPS data from UNAVCO and CGPS: 2006 to Present CVSRN stations: P056, P566, (depending on station) CRCN, LEMA, and RAPT NASA: 2006 – 2017 (except NASA (InSAR and UAVSAR for 2011 – 2014) programs) 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. 5

3/5/2019 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? 6

3/5/2019 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 7

3/5/2019 ITEM 5: Measurement & Monitoring Options Vendor Product Accuracy Pros Cons Unit Cost Rosemount 8750 Mag 0.25% - 0.5% • Proven Record • Cost ~ $3000/unit • • Meter Expandable Wireless Network Wireless network will be an Capabilities for Remote add’l cost Communication • • PowWow +/- 4% Inexpensive Yearly recurring payments $500/unit • No Add’l Installation Cost • No option to add GWL $200-$300/unit on • Bulk Discounts up to ~60% monitoring instruments to bulk orders • Maintains Title 23 Certification system (< 10% error) • • • McCrometer FPI Mag 0.5% - 1.0% Meter installed on Pump Cost ~$3100/unit • • Meter Multiple Meters can track flow Add’l installation cost • Ultra Mag 0.5% to individual fields/crops • May not fit for all Meter applications • Add’l cost for network 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 15 th . – Model to be refined with water budget refinements. • Draft Coordination Agreement discussed at Feb. 20 th 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. 8