### Re:AvenalClassIImpactAnalysis Dee_Morse to: EricWalther 11/21/200709:41AM Cc: CarolBohnenkamp,federalpower,"GaryRubenstein",mmccorison, "Gilliland,Steve","TraceyGilliland",tprocter,John_Bunyak History: Thismessagehasbeenforwarded.
Eric, We reviewed the information you provided regarding the Avenal Energy Project inAvenal, California. Given the relatively low emission increases (144 TPY of NOx, 81 TPY of PM10 and 16 TPY of SOx) and the distance to two National Park Service Class I Air QualityAreas (113 km southeast of Pinnacles NM and 113 km west of Sequoia NP), we do not anticipate the emissions from the Avenal Project will significantly impact either National Park Service Class I area. However, I do want to inform you that the statement onpage 11 of the Air DispersionModeling and Health Risk Assessment Protocol

- Avenal Energy Project "The project is not locatedwithin 100 km of Class I areas, therefore the project although a major source will not need to evaluate impacts to visibility and other air quality related values at Class I areas." is incorrect. The Federal LandManagers of Class I areas are concerned about proposed facilities beyond 100 km if the emission increases are significantly large, andmay request a full air quality analysis for these proposed facilities on a cases by case basis. Therefore, there is no automatic 100 km cutoff for Class I area impact analyses. Thanks, Dee Morse Environmental Protection Specialist Air Resources Division Natural Resource Program Center National Park Service Phone: 303 969-2817 Fax: 303 969-2822 e-mail: dee_morse@nps.gov

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1 1 "EricWalther" 1 1 1 <EWalther@sierrarel

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1 To: <Dee Morse@nps.gov>, <tprocter@fs.fed.us>, <mmccorison@fs.fed.us> - 

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1 cc: "Gilliland, Steve" <steve.gilliland@synenco.com>,<federalpower@houston.rr.com>. "Tracey Gilliland" 

### I <tegilliland@gmail.com>, "Gary Rubenstein" <GRubenstein@sierraresearch.com>, "EricWalther" I <EWalther@sierraresearch.com> Subject: FW: Avenal Class I Impact Analysis**>----------------------------------------------------­ -------------------~---­** 

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Dee, Trent andMike: At the request of Carol Bohnenkamp, and confirmed in a call with Dee today, I am providing you the following maximum annual emissions from the proposed Avenal Energy Project, for which project Carol has already forwarded to you the Air DispersionModeling and Health RiskAssessment Protocol: NOx: 144.3 tpy SOx: 16.3 tpy PMIO: 80.7 tpy As stated in the protocol, the closest distance from the Avenal Energy Project site to a Class I area, Pinnacles National Monument, is approximately 113 km. We appreciate your review of the protocol. Hopefully, your review of the emissions and distance will support our determination in the protocol that a Class I area impact analysis will not be required for this project. Eric Eric Walther Sierra Research 1801 J Street Sacramento, CA 95811-3009 916-444-6666 Main x121 916-444-8373 Fax 916-833-8774 Cell ewalther@sierraresearch.com