Bureau of Land Management's Decision Record and Environmental

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Jersey Valley Geothermal Development Project Environmental Assessment: NV063 -EAO8-09 1 The other two springs, located in the center of the unit area in the SW¼, SW¼ of Section 28 and the SE¼, SE¼ of Section 29, respectively, have been singly and collectively referred to as the Jersey Hot Springs. The spring located in Section 28 consists of a number of seeps which provide little flow. Due to the condition of the springs/seeps, the area cannot be accurately monitored. The spring located in Section 29 maintains a flow that supports a small pool and is commonly known as the main Jersey Hot Spring. These springs have temperatures reported at 29°C to 57°C (84°F to 135°F) (NBMG, 2004). Samples from the Jersey Hot Springs pool have shown it to principally be a sodium chloride/calcium sulfate water with a total dissolved solids (TDS) concentration of about 700 parts per million (ppm) and a temperature of 123°F (Ormat 2008). Boron concentrations (a chemical element generally diagnostic for geothermal waters) averaged about 1.75 ppm (see Table 8). Table 8: Chemical Species Information for the Jersey Valley Hot Springs Species Chemical Species Concentrations (ppm) Jersey Valley Hot Springs Jersey Valley Wells Ammonia (NH4) 0.80 - 1.30 0.00 - 0.54 Potential of Hydrogen (pH) 7.00 - 7.52 7.28 - 9.34 Bicarbonate (HCO3) 82.00 - 350.00 153.70 - 386.20 Carbonate (C03) 9.60 - 9.60 0.00 - 73.67 Total Alkalinity 28.00 - 290.00 0.00 - 320.00 Orthophosphate, as P 0.01 - 0.01 0.00 - 0.34 Chloride (Cl) 58.00 - 286.00 136.80 - 2398.00 Fluoride (F) 0.81 - 8.00 6.96 - 18.00 Sulfate (S04) 110.00 - 352.00 104.67 - 431.00 Nitrate Nitrogen (N03) 0.29 - 0.35 0.00 - 0.76 Total Dissolved Solids (TDS) 670.00 - 700.00 1100.00 - 4972.00 Electrical Conductivity 890.00 - 990.00 1400.00 - 8220.00 Aluminum (Al) 0.00 - 0.00 0.00 - 1.89 Barium (Ba) 0.10 - 0.14 0.19 - 3.18 Beryllium (Be) 0.00 - 0.00 0.00 - 0.003 Boron (B) 1.40 - 2.74 2.00 - 2.38 Calcium (Ca) 25.00 - 43.84 9.20 - 1185.00 Chromium (Cr) 0.08 - 0.10 0.00 - 0.34 Copper (Cu) 0.00 - 0.00 0.00 - 0.00 Iron (Fe) 0.04 - 0.07 0.07 - 6.36 Lead (Pb) 0.00 - 0.00 0.00 - 0.012 Lithium (Li) 1.10 - 1.61 0.49 - 5.99 Magnesium (Mg) 3.30 - 6.19 1.40 - 8.66 Manganese (Mn) 0.13 0.18 0.08 - 0.98 Potassium (K) 19.00 - 32.17 28.67 - 136.23 Silicon Dioxide (Si02) 120.00 - 199.56 115.11 - 315.00 Sodium (Na) 160.00 - 293.30 223.48 - 593.78 Strontium (Sr) 0.64 - 0.81 0.35 - 20.64 Zinc (Zn) 0.00 - 0.00 0.00 - 0.24 Mercury (Hg) 0.00 - 0.006 0.00 - 0.0088 Antimony (Sb) 0.00 - 0.00 0.00 - 0.18 Arsenic (As) 0.02 - 0.03 0.00 - 0.12 Thallium (TI) 0.00 - 0.00 0.00 - 0.001 - 66 -
Jersey Valley Geothennal Development Project Environmental Assessment: NV063 -EAO8-09 1 The NDWR lists eight points of diversion for surface water rights located within the Jersey Valley unit area. One of these is a certified irrigation right of 44.16 AFY from a stream source located on private land in Section 34. The remaining seven are vested stock water rights totaling 237.72 AFY from springs located in Sections 28 and 29 which are associated with the Jersey Hot Springs (NDCNR-DWR 2009b). Ormat has collected and analyzed samples of geothermal fluid from several of the geothermal wells drilled and flow-tested by Ormat as part of its exploration of the Jersey Valley unit area. These produced geotheimal fluids are, like the Jersey Hot Springs, a sodium chloride/calcium sulfate water, but with a substantially higher TDS concentration (approximately 2,600 ppm) (Ormat 2008) (see Table 8). Boron concentrations averaged about 2.21 ppm. 3.9.2 Environmental Consequences 3.9.2.1 Proposed Action The geothermal wells would be drilled using non-toxic drilling mud to prevent the loss of drilling fluids into the rock and the risk of contamination to any aquifers from the drilling fluid. Reserve pits would be constructed at each well site for the containment and temporary storage of drilling mud, drill cuttings, geothermal fluid and storm water runoff from each constructed well pad. Because non-toxic drilling mud would be used, the reserve pits are not proposed to be lined. Additionally, the bentonite drilling muds discharged into the reserve pits would tend to act as a liner, in the same way they prevent the loss of drilling fluids in the well bore into the rock. Therefore, contamination of the local ground water aquifers as a result of the temporary discharges into the reserve pits is unlikely. Over the operational life of the project, accidental discharges of geothermal fluids could contaminate surface or ground waters. However, these are unlikely because of the frequent inspections and ultrasonic testing of the geothermal pipelines, the pipeline flow and pressure monitoring and the well pump and pipeline valve shutdown features. Contamination of surface or ground waters from spills of petroleum products (such as diesel fuel or lubricants) is also unlikely because the well pads and power plant sites, where most petroleum products would be used and stored, would be bermed to contain and control any spills. The project includes the development of a spill and disposal contingency plan which would describe the methods for cleanup and abatement of any petroleum hydrocarbon or other hazardous material spill. During construction, the Jersey Valley Project would consume about 105 acre-feet of ground water over the anticipated 12-month construction period, principally for geothermal well drilling and dust control. This one-time quantity of construction water, obtained from existing private water well source, is substantially less than the perennial yield estimated for the basin. Thus, there is little potential for creating any adverse affects on the quantity of either surface waters or ground waters in or adjacent to the geothermal operations area. The following monitoring measure is proposed for the Jersey Valley project to verify the absence of adverse effects on the quantity and quality of ground waters. - 67 -
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In Reply Refer To: N-881 18 3200 (N
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The BLM MLFO has determined that in
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APPEAL PROVISIONS Decisions may be
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Al. Vicinity Map A2. Unit Map A3. R
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tsgend Al Unit Map • B. sflpa Wta
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ATFACHMENT B ENVIRONMENTAL ASSESSME
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Ormat Nevada, Inc. Jersey Valley Ge
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Jersey Valley Geothermal Developmen
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Figure 3: Jersey Valley Unit Area a
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Page 38 and 39: Jersey Valley Geothermal Developmen
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Finding of No Significant Impact Fo
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The “wetlands” potentially impa
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The EA’s mitigation and permit ap
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• •., •• ‘t! •: •*
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Form 2800- Issuing Office 14 (Augus
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I Table 1: Legal Description of Tra
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Jersey Valley Master Title Plat and
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— Figure 12: Jersey Valley Unit A
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9. The Holder shall comply with all
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shall be supported by a stipulation
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Form 2800- 14 (August 1985) UNITED
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Table 1: Legal Description of Trans
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Buffalo Valley (NVN-83484X) E Jerse
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May 10, 2010 N-87409 EXHIBIT B 1.0
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approved in writing by the Authoriz
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Form 2800- Issuing Office 14 (Augus
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____________ Buffalo Valley Jersex
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May 10, 2010 N-88390 EXHIBIT B 1.0
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shall be supported by a stipulation
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Form 2800- 14 (August 1985) UNITED
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A PA a,. 0.25 i8’ NoUm Maptent VV
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The Authorized Officer must approve
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Attachment E CONDITIONS OF APPROVAL
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Migratory Birds Attachment E CONDIT
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Migratory Birds Attachment E CONDIT
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Lands & Realty Attachment E CONDITI
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ATTACHMENT F EA COMMENT RESPONSES T
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for increased patrols to the Jersey
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