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

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ESTABLISHING THE REFERENCE POINT Water-level measurements from a given well must be referenced to the same datum (the reference point, or RP) to ensure data comparability (see Figure 4). For monitoring wells, the RP should be marked on the top of the well casing. For production wells, the RP will most likely be the top of the access tube or hole to the well casing. The RP must be as permanent as possible and be clearly visible and easily located. It can be marked with a permanent marker, paint, imprinting a mark with a chisel or punch, or by cutting a slot in the top of the casing. In any case, the location of the RP should be clearly described on DWR Form 429 (see Table 3). A photograph of the RP, with clear labeling, should be included in the well folder. In some cases, it may be valuable to establish multiple RPs for a well, depending on the consistent accessibility of the primary RP. In this case, each RP should be clearly described on DWR Form 429 and labeled in the field. The RP should be established with the following coordinate system: horizontal location (decimal latitude and longitude referenced to the North American Datum of 1983; NAD83) and vertical elevation (referenced to the North American Vertical Datum of 1988; NAVD88, in feet). The land-surface datum (LSD) is established by the person making the initial water-level measurement at the well. The LSD is chosen to represent the average elevation of the ground around the well. Because LSD around a well may change over time, the distance between the RP and LSD should be checked every 3 to 5 years. If appropriate, a concrete well pad or well vault may be chosen as the LSD, since they will be more permanent than the surrounding ground surface. The elevation of the RP can be determined in several ways: (1) surveying to a benchmark, (2) using a USGS 7.5’ quadrangle map, (3) using a digital elevation model (DEM), or (4) using a global positioning system (GPS). While surveying is the most accurate (± 0.1 ft), it is also the most expensive. Depending on the distance to the nearest benchmark, the cost can be prohibitive. The latitude and longitude of the well can be established accurately using a handheld GPS. From this information, the LSD can be located on a USGS quadrangle and the elevation estimated. However, the accuracy is only about ± one half of the contour interval. Thus, for a contour interval of 5 feet, the accuracy of the elevation estimate would be about ± 2.5 feet. The contour interval of high quality DEMs is currently about 30 feet. Therefore, the accuracy of using DWR Groundwater Elevation Monitoring Guidelines 9
Reference Point (RP) Tape at Water Surface Well Casing 16' 15' 14' 1' 13' 12' 11' 10' 9' 8' 7' 6' 5' 4' 3' 2' 1' 15.00' (Tape at RP) 12.10' (RP to WS) 2.9' (Tape at WS) 1.07' 11.03' (LSD to WS) Land Surface Datum (LSD) Calculation of Depth to Water Tape at RP 15.00' - Tape at WS -2.90' = RP to WS 12.10' - LSD to RP -1.07' = LSD to WS 11.03' Water Surface (WS) Figure 4. Groundwater-level measurements using a graduated steel tape (modified from U.S. Geological Survey, 2006). DWR Groundwater Elevation Monitoring Guidelines 10
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Martis Valley Groundwater Managemen
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This Groundwater Management Plan (G
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P:\40000\140691 - PCWA Martis Valle
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Section 2 Physical Setting The MVGB
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Independence Lake Donner Euer Valle
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Independence Lake Donner Euer Valle
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Legend Q Martis Valley Groundwater
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RESOLUTION NO. 11 - .!30F THE BOARD
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NOW, THEREFORE, the BOARD OF DIRECT
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16395813 PUBLIC NOTICE ·----------
Page 80 and 81: Page 2 of 2 of the Agenda of the Ma
Page 82 and 83: Martis Valley Groundwater Managemen
Page 84 and 85: Introduction Martis Valley GMP - Dr
Page 86 and 87: Martis Valley GMP - Draft Public Ou
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
Page 98 and 99: ELEVATION (FEET NAVD88) 7500 7000 6
Page 100 and 101: DWR CASGEM Well FIGURE 3-1. EXISTIN
Page 102 and 103: Figure 3‐1 Reference Index 1 2 3
Page 104 and 105: 3.4 REQUIRED STEPS IN SELECTING A N
Page 106 and 107: 4.0 MONITORING EQUIPMENT AND PREPAR
Page 108 and 109: 4-3 Monitoring Equipment and Prepar
Page 110 and 111: Keys for gates and monitoring well
Page 112 and 113: 4-7 Monitoring Equipment and Prepar
Page 114 and 115: Depth-to-groundwater Procedures and
Page 116 and 117: Recording of Monitoring Data, Data
Page 118 and 119: Recording of Monitoring Data, Data
Page 120 and 121: Department of Water Resources Groun
Page 122 and 123: INTRODUCTION TO THE CASGEM PROGRAM
Page 124 and 125: exceptions to this density range in
Page 126 and 127: FREQUENCY OF WATER‐LEVEL MEASUREM
Page 128 and 129: Figure 3. Common environmental fact
Page 132 and 133: Table 3. General well data form (DW
Page 134 and 135: Table 4. Equipment and Supply List
Page 136 and 137: conditions may require deviating fr
Page 138 and 139: 6. Subtract the “Tape at WS” nu
Page 140 and 141: (2) Electric Sounding Tape Method T
Page 142 and 143: ecording this measurement with the
Page 144 and 145: idea of the expected range of groun
Page 146 and 147: Top of Casing (RP) Hanging Point Ba
Page 148 and 149: Table 6. Groundwater level data for
Page 150 and 151: GLOSSARY OF TERMS The following ter
Page 152 and 153: Groundwater subbasin - A subdivisio
Page 154 and 155: REFERENCES Alley, W.M., ed., 1993,
Page 156 and 157: Appendix B CASGEM Monitoring Plan S
Page 158 and 159: • groundwater conditions in the b
Page 160 and 161: Monitoring Entities will submit the
Page 162 and 163: IN THIS ISSUE: WATER QUALITY REPORT
Page 164 and 165: Monitoring of Unregulated Substance
Page 166 and 167: Primary Business Address Your Addre
Page 168 and 169: Drinking water, including bottled w
Page 170 and 171: U.S. Geological Survey and the Cali
Page 172 and 173: RESULTS: Groundwater Quality in the
Page 176 and 177: utilized a water balance method to
Page 178 and 179: 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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