150SOUTH NINTHSTREET ELCENTRO,CA 92243-2850 AIR POLL

ORMESA, LLC P.O. BOX86 HOLTVILLE, CA 92250 TELF.PHONE: (760) 482-4606 FAX: (760) 3!!3-9904

LOCATION: 3300 EAST EVAN HEWES HIGHWAY, HOLTVILLE, CA A. General Conditions 1. The facility shall be constructed and operated in compliance with the project description and operating parameters of the following applications, except as may be modified by more stringent requirements oflaw orthese conditions: (FR# 31750), dated March 23rd, 1988; (FR#240364), dated January 12'h, 1997; (FR#522563-522565), dated January 23rd, 2006; (FR#527237), dated October 101h, 2006; (FR# 549046) dated August 22, 2007; (FR# 2011635910) dated February 91 h, 2011; (FR#2011636) dated April 21st 2011; (FR#2012639920) dated March 19, 2014. 2. Operation of all equipment shall be in compliance with applicable APCD Rules and Regulations. 3
. This permit does not authorize the emissions of air contaminants in excess of those allowed by the U.S. EPA (title 40 of the Code of Federal Regulation), the State of California Division 26, Part 4, Chapter 3 ofthe Health and Safety Code, ortheAPCD (Rules and Regulations). 4
. This permit cannot be considered permission to violate applicable existing laws, regulations, rules or statues ofothergovernmental agencies. 5. No air contaminant shall be released into the atmosphere which causes a public nuisance
. (Rule 407)
. 6
. The Permittee shall not release or discha,rge into the atmosphere from any single source ofemission, any aircontaminant as dark ordarkeras designated as No. 1 on the Ringlemann Chart (20% opacity) for a period or periods aggregating more than three (3) minutes in any hour. 7. The Permittee shall comply with the general requirements for control of fine particulate matter (PM1

### O); construction and earthmoving activities; bulk materials; carry-out and track-out; open areas; paved and unpaved roads; and conservation management practices. Conditions Issued**04/07/20 14** **~-v** Page 1of11 Conditionsfor Permit#20021-4
AN EQUALOPPORTUNITYIAFFIRMATIVEACTIONEMPLOYER

### 8. The emissions of any regulated pollutant, as defined pursuant to 40CFR70.2, shall be less than the major source threshold values of Rule 900.B.20, of the Imperial CountyAPCD, forthe facility. 9
. The emission of any single hazardous air pollutant, as defined pursuant to Section 112(b) of the 1990 Clean Air Act and Rule 900.8.20, shall be less than 10 tons per year, for the facility. Total combined emissions of all hazardous air pollutants, as defined pursuant to Section 112(b) of the 1990 Clean Air Act and Rule 900.B.20, shall be less than 25 tons peryear, forthe facility. 10. Total facility wide benzene emissions shall notexceed 9.93 tons peryear. 11
. Any unpaved roads, paved roads, and open areas subject to be disturbed by vehicles traffic shall comply with the requirements for fugitive dust control (Rule 805). 12
. The Permittee shall prevent or cleanup any carry-out ortrack-out (Rule 803)
. 13
. All equipment shall be maintained in good operating conditions and shall be operated in a manner to minimize emissions of air contaminants into the atmosphere. B. lsopentane Emissions 1
. Under normal operating conditions: maintenance, Vapor Recovery Unit (VRU) purging and fugitive daily emissions, the total isopentane emissions shall not exceed a quarterly average of 142.9 lbs/day from the entire facility, as determined by inventory and mass balance procedures. a. All noncondensable gas (NCG) purging of any OEC Unit shall be conducted through the facility's Vapor Recovery Unit (VRU). The purging ofgases through the VRU to the atmosphere shall be conducted only after the separation cycle of NCG and isopentane gases is completed. Purging of NCG to the atmosphere shall be conducted in a manner to minimize entrainment of isopentane gases with the NCG. b. lsopentane emissions occurring during normal purging events shall be considered part of the daily average isopentane emissions for the total isopentane loss for the reporting quarter. 2
. lsopentane emissions occurring during normal repair and maintenance shall not be considered a breakdown and shall be considered part of the daily average isopentane emissions forthe total isopentane loss forthe reporting quarter. 

### 3. Prior to conducting maintenance, repairs or modifications on the portions of the OEC isopentane system that cannot be independently isolated, and the OEC isopentane system has to be open and exposed to air, the Permittee shall control the isopentane emissions by doing all the following: Conditions Issued 04/07/2014

# ~ Page 2of11 Conditionsfor Permit#20021-4a. Empty the OEC unit of lsopentane by pumping it to the Maintenance tanks
. b. Purge lsopentane Vapors from the OEC unit using nitrogen gas and condensing the Vapors through the portable VRU system equipped with a chiller. The liquefied lsopentane collected in the portable VRU tank shall be pumped to the storage tank. c. The Portable VRU shall achieve a minimum 95% lsopentane vapor recovery efficiency during the purging of the emptied OEC before maintenance. 4
. The Permittee shall install and maintain, in good working order, an in-line flow meter (cfm) at the inlet of the VRU. The flow meter shall be equipped with a totalizer. 5. Venting isopentane from an OEC Unit to the atmosphere for the sole purpose of evacuation is prohibited. 6
. Any breakdown, malfunction, or upset occurrence which constitutes a breakdown condition resulting in the emission ofany air pollutantto the atmosphere, shall be reported to the APCD as soon as reasonably possible but no later than two (2) hours after its detection, and should identifythe time, specific location, equipment involved, and to the extent known the cause of the occurrence, and immediate remedial measures shall be undertaken to correct the problem and prevent further emissions into the atmosphere. The completion ofcorrective measures or the shutdown of emitting equipment is required within twenty four (24) hours of occurrence ofa breakdown condition. 7. If the breakdown condition will require more than twenty four (24) hours to correct, the Permittee, in lieu ofshutdown, shall submit a variance application to the Air Pollution Control Officer (APCO) requesting to commence the variance procedure setforth in the APCD Hearing Board Procedures. 8
. Within ten (10) days after a breakdown occurrence has been corrected; the owner or operatorshall submit awritten report to theAPCO which includes: a. A statement that the occurrence has been corrected, along with the date ofcorrection and proofofcompliance. b. A specific statement ofthe reason(s) or cause(s) ofthe occurrence so that the APCO can determine whether the occurrence was a breakdown condition. c. A description of the corrective measures undertaken and/or to be undertaken to avoid such an occurrence in the future. d. An estimate ofthe emissions caused by the occurrence. e. Pictures ofthe equipment or controls which failed, ifavailable
.

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. Failure to comply, or comply in a timely manner, with the reporting requirements shall constitute cause for enforcement action. 10
. lsopentane breakdown emissions and losses shall be deducted from the total isopentane loss for the reporting quarter before calculating the daily average emissions. C. Regenerative Thermal Oxidizer/Scrubber Unit 1
. The Permittee shall install, operate, and maintain the RTO/Scrubber system during all times the production wells are in use, except as provided below: a. Maintenance activities (operation of wells without the RTO/Scrubber system) shall be restricted to a maximum of360 hours peryear. b. The leAPeD shall be notified at least 24 hours in advanced via fax or telephone before any scheduled maintenance is performed on the RTO/Scrubbersystem. 2
. For normal RTO/Scrubber operations, the following emission limits from the controlled NeG scrubberstack shall not be exceeded: a. Benzene emissions 5.2 pounds perday. b. Hydrogen sulfide emissions 1.66 pounds perday. c. Sulfurdioxide emissions 3
.06 pounds perday
. d. Nitrogen oxide emissions 13.75 pounds perday. e. PM 10 emissions 12.0 pounds perday. f. voe (not including Benzene) emissions 4.77 pounds per day 3
. The following emission limits from the condensate line (condenser hotwell/cooling tower) shall not be exceeded: a. Benzene emissions 44.10 pounds per day. b. Hydrogen sulfide emissions 115.44 lb/day. 4
. During periods ofoperation without the abatement system (RTO/Scrubber) being online due to repairs and regular maintenance, including rock muffler venting events, which shall notexceed 15 days peryear, emissionsfrom the uncontrolled NCG stack and condensate line shall not exceed thefollowing: a. Benzene emissions 174.00 pounds perday. b. Hydrogen sulfide emissions 198.48 lb/day. c. voe (not including Benzene) emissions 170.52 pounds perday
. 

### 5. Except during maintenance activities, the RTO combustion chamber temperatures shall maintain an operating temperature of at least 1,500° Fahrenheit. Propane shall be used during cold start-ups to pre-heat the RTO until the target temperature is reached. Conditions Issued 04/07/2014 

# h Page 4of11 Conditionsfor Permit #20021 -46
. The operating temperature of the RTO Combustion Chamber shall be monitored continuously; the data shall be logged and shall be available to the APCD inspectors to demonstrate compliance. 7. The Permittee shall continuously monitor noncondensable gas flow into the RTO, RTO combustion bed and chambertemperature, and RTO exhausttemperature. 8
. A log shall be maintained on the premises showing weekly hours of operation and routine repairs of the RTO/Scrubber system. This log shall be made available to the APCD for inspection upon request. 9
. The operating scrubber water re-circulation rate and scrub water pH shall be continuously monitored and maintained in adaily log. The records shall be made available to theAPCD for inspection upon request. . 10. The RTO/Scrubber system shall count with an electronic log in its PLC (Programmable Logic Controller) or DCS (Direct Control System) and shall be available for the APCD Inspectors showing hours of operation, shutdown hours for routine repairs and combustion chamber operating temperature. D. Monitoring and Testing 1. The APCD may at any time monitor emissions from any source within the facility 2. The APCD may at any time, but no more than twice per year, authorize thirdparty air emissions testing and/or an inventory ofthe air emissions ofthe facility
. The cost ofthe air emissions testing shall be borne by the Permittee. The APCD shall give advance notification to the Permittee prior to any air emissions testing or airemissions inventory required. 3
. The Permittee shall conduct a source test of the facility every six months performing the following analyses: a. Of turbine condenser condensate for: hydrogen sulfide, benzene, ammonia arsenic, beryllium, cadmium, chromium, copper, lead, manganese, mercury, nickel, radon, selenium, and zinc. b
. Of cooling tower blow-down for: hydrogen sulfide, benzene, ammonia, arsenic, beryllium, cadmium, chromium, copper, lead, manganese, mercury, nickel, radon, selenium, and zinc. c. Of the non-condensable gas line for before the RTO/Scrubber system (uncontrolled) for hydrogen sulfide, ammonia, benzene, arsenic, mercury, radon, toluene, and xylene
. d. Ofthe RTO/Scrubber Stack gas exhaust for: hydrogen sulfide, benzene, ammonia, SOx, NOx, and PM10. e. Testing protocol shall be submitted to the District for approval prior to source test being conducted.

Conditions Issued 04/07/2014 Page 5of11 Conditionsfor Permit#20021-4f. All source test analysis shall use U.S. EPA/ARB approved methods and/or ICAPCD approved equivalent. g. During the source test the steam and the non-condensable gases mass flow rate shall be determined and the results submitted into the report in pounds per hour, per day and tons per semester for every pollutant. All analysis results shall be available at the facility for inspection. h
. The sourcetest report shall include the results in pounds per hour, perday and tons per Semester of hydrogen sulfide, benzene and ammonia before and after BACT (RTO/Scrubber)
. SOx, NOx and PM10 emissions after BACT shall be included as well
. i. All official source tests shall be witnessed by an ICAPCD official. This condition may be waived upon ICAPCDwritten authorization. 4
. The Permittee shall monitorthrough the sight glass the volume ofthe lsopentane in the working tank and storage tank on a weekly basis and every time in which the following occurs: a. maintenance is conducted and the OEC system has to be emptied and vapors recuperated through the VRU portable system. b. a new load of lsopentane is added to the system. 

### 5. The Permittee shall calculate all isopentane and reactive organic compounds dailyemissions ofpounds per day based on a quarterly average. 

### 6. Each performance test protocol shall be submitted to the APCO for approval 

### 30 days priorto testing and should include the following: a. Emission unit identification and description b
. Sampling and analysis procedures c. Test schedule 7. Performance tests for criteria pollutants, H2 S and benzene shall be conducted in accordance with approved CARS or US EPA stationary source test methods (or alternate methods with priorwritten approval bythe ICAPCD): 

### a. b. c. 

### d. 

### e. US EPA Methods 1-4 CARS Method 

### 100 SCAQMD Method 

### 307 US EPA Method 

### 6 CARS Method 41OA Sampling, Volumetricflow, Mwand %moisture NOx, VOC, CO, C02 and 02 H2S S02 Benzene 8
. The Permittee shall conduct a Source Test of the portable VRU. The Source Test shall be conducted three months after the commissioning ofthe VRU; and every year thereafter, or sooner if requested by the APCO
. The source testing shall use EPA methods or APCD approved equivalent. The source testing shall be witnessed by APCD staff. All analytical results shall be available at the facility for inspection. Source test shall be conducted forthefollowing: a. Ofthe non-condensable gases vented for: VOC's, N2,02, C02. ConditionsIssued

# 04/07/2014~ Page 6of11 Conditionsfor Permit#20021-49
. The Permittee shall inspect, on a yearly basis, during the turnaround or plant shut down the Cooling Tower Drift Eliminators to ensure that every Cooling Tower Cell have the complete set ofpanels of Drift Eliminators and replace those that are damaged. 

### 10. The Permittee shall monitor, on a monthly basis, the cooling tower water chemistry including Total Dissolved Solids
. 

### 11 . The Permittee shall provide records, collect samples or gather other required information to demonstrate compliance with APCD Rules and Regulations as requested bytheAPCO. 

### 10. All required source testing, sampling, analysis and reporting costs shall be borne bythe Permittee. 

### 11 . Upon proper notification, the APCD or its designee shall have the right to enter, inspect and take samples within the permitted facility. E. Reporting 1
. The Permittee shall submitto the ICAPCD a report containing source test results conducted pursuant to the requirements of Condition D.3 (NCG, condensate, cooling tower water and RTO/Scrubber) above, expressed in pounds per hour. The partial report shall be submitted to the APCD within 60 days ofthe preceding month and the annual report bythe end of February ofeach operating year. 2. The Permittee shall submit to the ICAPCD a report containing the portable VRU source testing results pursuant to Condition 0.8
. The report shall be submitted within 60 days ofthe test. a. Analysis conducted pursuantto the requirements ofCondition 0.8 above. b. Based on the analyses conducted in Condition D.8, the emissions derived from the analyses, an emission inventory for the facility showing compliance with permit limits. 3. Permittee shall submit to the ICAPCD a quarterly report 30 days after the end of the quarterwhich consists ofthe following: a. The Permittee shall submit an lsopentane inventory and mass balance, including the changes in volume, for the working lsopentane tank and the used lsopentane tank. The Permittee shall calculate the lsopentane expended per day, week, month and year pursuant to the requirements of Conditions D.4 and D.5. b. The total amount of isopentane renewals brought to the facility during the reporting quarter and the previous quarters of that calendar year. The facility shall includethe isopentane supplier's name and address.

Conditions Issued 04/07

# /2014~ Page 7of11 Conditionsfor Permit #20021-4c. The total amount ofisopentane present atthefacility before renewals. d. The number ofisopentane withdrawals from OEC unitsfor maintenance. e. The number of rotating seals replaced or installed, or any other OEC seal orgasketfailure, that occurred during the reporting quarter. f
. The number ofpressure relief rupture discs removed and replaced during the reporting quarter. g. The total flow, in cubic feet, through the VRU during the reporting quarter. h
. The Permittee shall report to the APCD by telephone all non-normal (upset) releases of isopentane or geothermal gases to the atmosphere within 

### 24 hours ofthe release occurrence. 4
. The Permittee shall submit to the ICAPCD an annual report by the end of February ofeach operating year. This report shall include the following: a. Total tons of H2S, Benzene, SOx, NOx and PM10 emissions for the reporting year. b. Types and quantities ofcooling water additives. c. The status of all active wells associated with this facility used for production or injection during the reporting year. For each well includethe total days of rig activity (work over, clean out or drilling) and the total hours ofventing to the atmosphere (from test units). d. Gross and Net electrical megawatt-hours produced forthe reporting year. e. The total volume and pounds of lsopentane expended (purchased) during the year. f. The number of times that the OEC system was opened for repairs, maintenance ormodifications. g. The isopentane emissions report by month, by quarterand by year. 5. Within 10 days aftera breakdown occurrence has been corrected, the Permittee shall submit awritten report to the APCO which includes the following: a. A statementthatthe occurrence has been corrected. b. The reason(s) or cause(s) ofthe occurrence. c. A description ofthe corrective measures undertaken. d
. The type of emission and estimated quantity of the emissions caused by the occurrence. F. Emergency Fire Pump 1
. The listed diesel emergency fire pump shall be restricted to operate a total of thirty (30) hours peryearfor maintenance and testing purposes. 2. The listed emergency fire pump shall not discharge into the atmosphere any visible air contaminant other than uncombined water vapor, for a period or periods aggregating more than three minutes in any one hour, which is 20% opacity orgreater.

Conditions Issued 04/07/2014___..fil_ Page 8of11 Conditionsfor PermIt#20021-43
. The listed emergency fire pump shall be equipped with a non-resettable hour meterwhich must be kept in properworking condition at all times
. 4
. The diesel engine ofthe listed emergency fire pump shall be fueled only with one ora combination ofthe following: a. CARS dieselfuel; or b
. an alternative diesel fuel, such as biodiesel ora biodiesel blend that does meetthe definition ofCARB diesel fuel; or c. any alternative dieselfuel that meets the requirements ofthe Verification Procedure; or d
. CARS diesel fuel used with fuel additives that meetsthe requirements ofthe Verification Procedure. 5. The permittee shall maintain an engine operating daily log onsite for every month or any part of a month that the listed emergency fire pump operated. The Permittee shall maintain all required records required for a minimum of two (2) calendar years and make them available to the District upon request. The log shall includethe following for each emergency unit: a. Engine manufacturer name, model number, brake horsepower output rating, and type offuel combusted; b
. A manual of recommended maintenance as provided by the engine manufacturer or other maintenance procedure as approved in writing by theAPCO; c. Record of routine engine maintenance, including date(s) and type of maintenance performed; d. A specific emission inspection procedure, with an inspection schedule, to ensure that the engine is operated in continual compliance with Air District Rule 400
.3. Inspections shall be conducted every quarter or after every 2,000 hours of engine operation. In no event shall the frequency of inspections be less than once peryear. e. Total daily recorded hours of operation for maintenance and testing purposes. f. Total daily recorded hours ofoperation for emergency events. 6
. The Permittee shall submit to the APCD an annual report by the end of February of each operating year which contains the following information for the listed emergencyfire pump: a. Monthlyfuel consumption b
. Monthly hours ofoperation for maintenance and testing purposes. c. Monthly hours ofoperation for emergency events.

Conditions Issued 04/07 /2014 Page 9of11 Conditionsfor Permit#20021-4Equipment List 1. Geothermal Production and Injection Wells Following is the list of production and injection wells associated with GEM Resources, LLC, GEM 2&3 Geothermal Power Plantfacility: No. ofWells PRODUCTION INJECTION WELLS WELLS 1 P/W 88-7 l/W83-7 2 P/W24-8 l/W63-7 3 P/W 54-7 l/W27-7 4 P/W41-7 l/W33-7 5 P/W 71-7 l/W53-17 6 P/W82RD-7 l/W61-7 7 P/W61-12 l/W81-7 8 P/W 54-12 l/W8-1 9 P/W81-12 l/W27-8 

### 10 P/W21-7 IM/84-7 11 P/W25-7 IM/32-17 12 PM/74-12 IM/56RD-7 13 P/W65-7 IM/53-12 14 P/W61-18 l/W 13-7 15 P/W26-7 l/W44-7 16 P/W72-13 1/W44A-7 17 1/W44B-7 18 l/W42-18 19 l/W85-12 20 l/W28-7 21 l/W 16-7 22 l/W78-12 23 l/W25A-7 24 l/W49-7

Conditions Issued 04/07/2014 

# <Sri. Page 10of 11 Conditionsfor Permit#20021-42
. Emergency Fire Pump One (1) Emergency Fire Pump, Caterpillar Diesel Engine, Model 3306BDI, with a rating of231 hp at 1,800 rpm. 3
. Gems 2&3 Dual Flash Geothermal Power Generating Units (47MW). 4
. Two Thermodynamic Cycle - ORMAT ENERGY CONVERTER (OEC) (10 MW). a. Turbo generatorskid b. Lubricating and seal oil system skid c. HeatexchangersWater-cooled condenser d. Organic motivefluid and geothermal brine piping system. e. Control and power system f. Two Turbines: two stages, rated power at 1,800 rpm of5,000 kW. g. Synchronoustype Generator, output rating 10,000 kV. h. OEC Motive Fluid: lsopentane, charge 369,446.3 lbs i. lsopentane storagetank j. lsopentaneworking tank 5. One (1) Vapor Recovery Unit (VRU), designated as VRU#2: The VRU#2 is truck mounted, equipped with a 300 gallon heat exchanger, a 10- ton R22 refrigeration units, a 200 gallon chilled water tank, and other ancillary equipment (VRU # 2 serves the Ormesa Geothermal II power plant; Ormesa Geothermal IH power plant; and the GEM 2&3 power plant). 6. Regenerative Thermal Oxidizer a. Adwest Technologies RETOX dual-chamber RTO unit. b Wet scrubber Envitech Packed Bed caustic scrubber. 7. Three (3) Cooling Towers a For the flash plant two (2) Marley cooling towers counter flow; capacity of41,800 gal/min re-circulation rate each
. b For the Ormat System one (1) Marley cooling tower counter flow; capacity of34, 700 gal/min re-circulation rate.

Conditions Issued 04/07/2014

# ~' Page 11of11 Conditionsfor Permit#20021-4