Martis Valley Groundwater Management Plan - Placer County Water ...

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Martis Valley Groundwater Management Plan Section 3 3.4.2 Continue and Encourage Water Conservation Activities and Public Education The partner agencies currently implement significant water conservation and public outreach programs per State requirements. All three agencies hold public board meetings and maintain informative websites for public outreach purposes at the following web addresses: www.tdpud.org www.pcwa.net www.northstarcsd.org This implementation action encourages the partner agencies to continue to implement conservation activities and continue public outreach activities as opportunities become available. 3.4.3 Work with local stakeholders and DWR to identify areas that may need additional groundwater level and groundwater quality monitoring based on identified data gaps or negative performance trends Currently, groundwater is monitored by the partner agencies under CASGEM, and by DWR, who monitors a number of wells in the MVGB. DWR monitoring wells are shown in Figure 3-1. This implementation action requires the partner agencies to work with local stakeholders and DWR to identify areas in need of additional monitoring. The SWG included two DWR North Central Region office staff and future members of the SWG should continue to include DWR staff. Through the SWG, the partner agencies will be working with local stakeholders and DWR, and will discuss identification of additional monitoring areas at the SWG annual meetings. 3.4.4 Coordinate with other agencies, including DWR and the USGS to identify opportunities for land subsidence monitoring Inelastic land subsidence is caused by dewatering of aquifers and the compressing of clays. As water is removed from the aquifer, it is transported through interconnected pore spaces between grains of sand and gravel. If an aquifer has intervals of clay or silt within it, the lowered water pressure in the sand and gravel results in the slow drainage of water from the clay and silt beds. The decreased water pressure reduces the support for the clay and silt beds. Because these beds are compressible, they compact (become thinner) and the effects are seen as a lowering of the land surface. The lowering of the land surface elevation from this process is often permanent (inelastic). Recharge of the aquifer will not result in an appreciable recovery of the land-surface elevation. The partner agencies have not developed a network of extensometers to measure inelastic land subsidence. Groundwater level monitoring indicates that groundwater levels have not been significantly lowered, a condition required for land subsidence due to groundwater extraction to occur. Additionally, the geology (Section 2.4) in the MVGB does not consist of large layers of clay to be compressed, and is unlikely to experience inelastic land subsidence even if groundwater levels begin to decline. Based on a review of groundwater elevation trends over time, it can reasonably be assumed that significant land subsidence has not occurred on a regional scale due to groundwater extraction within the MVGB. Under this implementation action, the partner agencies will coordinate with DWR and the USGS to identify opportunities for collaboration to detect land subsidence. Because inelastic land subsidence is tied to groundwater levels, the primary means for early detection include: Monitor and analyze groundwater levels, watching for significant declines Inspect wells for anecdotal evidence of subsidence during groundwater level monitoring Monitoring groundwater levels with concurrent inspections for anecdotal evidence of subsidence is the least expensive, and least reliable, method to monitor for land subsidence. Declines in groundwater levels can be a precursor to land subsidence. Staff performing water level monitoring can inspect the DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the end of this document. P:\40000\140691 - PCWA Martis Valley GWP\GMP\Report\3rd Draft\Martis Valley GMP Draft 01-09-13.docx 3-9
Martis Valley Groundwater Management Plan Section 3 monitoring well for indicators of subsidence. Anecdotal subsidence indicators include cracks in the well pad, elevation of the well casing in comparison to the ground surface, and cracks in the ground surface. 3.4.5 Evaluate the need for, and advocate for, as necessary, a wellhead protection, groundwater recharge area protection, and other programs as necessary in MVGB Wellhead protection is a component of the Drinking Water Source Assessment and Protection (DWSAP) program administered by the DPH. The purpose of the DWSAP program is to protect groundwater sources of public drinking water supplies from contamination, thereby eliminating the need for costly treatment to meet drinking water standards. There are three major components to the DWSAP program, including: Delineation of capture zones around source wells, inventory of potential contaminating activities within protection areas, and analysis of vulnerabilities. The partner agencies are in compliance with the DWSAP program, will work to comply with the DWSAP program into the future, and will consider supporting programs that will protect groundwater quality in the MVGB. 3.4.6 Map and share groundwater recharge zones This GMP identifies preliminary areas of groundwater recharge in the MVGB in Section 2.9. Once the groundwater model is calibrated and finalized, groundwater recharge zones will be updated during the scheduled plan update identified in Section 3.1.1. This implementation action encourages the partner agencies to share the recharge zone maps developed in this GMP with local land use agencies to consider in land use decisions. 3.4.7 Provide relevant information to land use agencies regarding groundwater availability Through GMP implementation activities, such as CASGEM monitoring, groundwater monitoring summary reports and annual meetings of the SWG, the partner agencies will develop water resources information about the MVGB. As development increases in the MVGB, local land use agencies will be faced with decisions regarding zoning and permitting. In Placer County, the Community Development Resource Agency leads development of the County’s general plan and land development activities. The Nevada County Community Development Agency is responsible for the Nevada County General Plan and zoning, and the Town of Truckee has developed its own general plan and zoning. This implementation action directs the partner agencies to communicate relevant groundwater information to the appropriate planning agencies to assist them in making informed land use decisions. 3.4.8 Summary of BMO #4 Actions Table 3-4 presents a summary of implementation actions to be undertaken by the partner agencies that support BMO #3 including the anticipated schedule of implementation. Table 3-4. Summary BMO#4 Supporting Implementation Actions Description of Action Implementation Schedule 4-1 Establish and maintain a CASGEM compliant monitoring program Ongoing 4-2 Continue and encourage water conservation activities and public education Ongoing 4-3 Work with local stakeholders and DWR to identify areas that may need additional groundwater level and groundwater quality monitoring based on identified data gaps or negative performance trends DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the end of this document. P:\40000\140691 - PCWA Martis Valley GWP\GMP\Report\3rd Draft\Martis Valley GMP Draft 01-09-13.docx Annually 3-10
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Martis Valley Groundwater Managemen
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This Groundwater Management Plan (G
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Page 19: Section 2 Physical Setting The MVGB
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Page 57: Legend Q Martis Valley Groundwater
Page 67 and 68: RESOLUTION NO. 11 - .!30F THE BOARD
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Page 78 and 79: 16395813 PUBLIC NOTICE ·----------
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Page 84 and 85: Introduction Martis Valley GMP - Dr
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Page 90 and 91: TABLE OF CONTENTS i Table of Conten
Page 92 and 93: FIGURE 1-1. MAP OF GROUNDWATER BASI
Page 94 and 95: 2.0 BACKGROUND 2-1 Background This
Page 96 and 97: ELEVATION (FEET NAVD88) A North 750
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Page 100 and 101: DWR CASGEM Well FIGURE 3-1. EXISTIN
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Page 104 and 105: 3.4 REQUIRED STEPS IN SELECTING A N
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4-3 Monitoring Equipment and Prepar
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Keys for gates and monitoring well
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4-7 Monitoring Equipment and Prepar
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Depth-to-groundwater Procedures and
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Recording of Monitoring Data, Data
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Recording of Monitoring Data, Data
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Department of Water Resources Groun
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INTRODUCTION TO THE CASGEM PROGRAM
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exceptions to this density range in
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FREQUENCY OF WATER‐LEVEL MEASUREM
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Figure 3. Common environmental fact
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ESTABLISHING THE REFERENCE POINT Wa
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Table 3. General well data form (DW
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Table 4. Equipment and Supply List
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conditions may require deviating fr
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6. Subtract the “Tape at WS” nu
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(2) Electric Sounding Tape Method T
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ecording this measurement with the
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idea of the expected range of groun
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Top of Casing (RP) Hanging Point Ba
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Table 6. Groundwater level data for
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GLOSSARY OF TERMS The following ter
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Groundwater subbasin - A subdivisio
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REFERENCES Alley, W.M., ed., 1993,
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Appendix B CASGEM Monitoring Plan S
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• groundwater conditions in the b
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Monitoring Entities will submit the
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IN THIS ISSUE: WATER QUALITY REPORT
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Monitoring of Unregulated Substance
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Primary Business Address Your Addre
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Drinking water, including bottled w
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U.S. Geological Survey and the Cali
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RESULTS: Groundwater Quality in the
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utilized a water balance method to
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with water supply wells. Perennial
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Figure 3. PRMS model domain with a
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Figure 6. Value of recharge efficie
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Figure 8. Mean annual recharge (inc
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