Central California Ozone Study (CCOS) - Desert Research Institute

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CCOS Field Operations Plan Version 2: 5/31/00 the station ozone analyzer is taken off line. The station operator identifies the appropriate data channel and disconnects the sample line from the sample manifold. After plugging the open port of the sample manifold, the entire sample train of the ozone analyzer is connected to the Environics Series 100 ozone generator output via a glass manifold. Care is taken to introduce the ozone sample through as much of the normal sampling train (i.e., filters, and scrubbers) as possible. Ozone concentrations are determined by ultraviolet photometric methods and are referenced to either CARB’s or AVES’s primary ozone standard. The zero air supplied by a zero air generator is split into two streams. One of the air streams is directed through an ozone generator that uses an ultraviolet lamp to convert diatomic air molecules into ozone. The second air stream is directed into the ozone transfer standard sample bench and serves as the reference air that determines the audit transfer standard baseline. This baseline value (which corresponds to zero) is compared (by the transfer standard’s electronic systems) with the ozone bearing sample stream. The difference between the reference and sample air streams is the audit concentration as referenced to the AV primary ozone standard. The audit compares the readings of the audit transfer standard determined concentrations with the corresponding station analyzer DAS and chart recorder outputs. The audit transfer standard and the station ozone analyzer sample the same sample outputs from a glass manifold connected to the ozone generator output. Ten consecutive readings of the audit transfer standard and the station ozone analyzer DAS and chart recorder outputs are taken at each of the concentration ranges (specified in the next subsection) and averaged. The averaged audit transfer standard readings are corrected for temperature and pressure and the correction factor from the certification with the AVES primary standard. These corrected audit values and the corresponding station ozone analyzer values are then compared by a least squares linear regression analysis and compared with the EPA recommended criteria (Table 4.5-2). The ozone analyzers are challenged with specific concentrations of span gas as follows: Audit Points Concentration Range (ppm) 1 0.000 2 .03 to .08 3 .15 to .20 4 .35 to .45 Continuous Analyzers. The continuous analyzers (including NO/NO x , NO/NO y , CO, and CO 2 ) are all initially audited in a similar manner. The audits of the analyzers begin with the station technician identifying the appropriate data channel and taking it off line so that ambient data were no longer being collected. Next, the station technician disconnects the sample line of the corresponding analyzer from the sample manifold. After plugging the open port of the sampler manifold, the sample line or inlet filter is connected to the dilution system via a vented glass manifold through which the audit span gas is introduced to allow the audit test atmosphere to travel through as much of the normal sampling train (i.e., filters, scrubbers, etc.) as possible. The analyzer is challenged with specific concentrations of span gas as follows: Audit Point Concentration Range NO, CO, CO 2 Chapter 4: QUALITY ASSURANCE 4-20
CCOS Field Operations Plan Version 2: 5/31/00 1 .0 2 6 to 16% of full scale 3 30 to 40% of full scale 4 70 to 90% of full scale All concentrations are generated by NIST-traceable cylinders and gas dilution. Audit input concentrations and the corresponding analyzer values are compared by a leastsquares linear regression analysis and compared with the EPA recommended criteria (Table 4.5- 2). NO/NO x and NO/NO y Analyzers. NO/NO x and NO/NO y analyzers are further challenged with concentration of additional nitrogen compounds. Nitrogen dioxide concentrations are introduced into the analyzer by gas-phase titration (GPT) of NO with O 3 . Nitric oxide reacts completely with ozone to produce nitrogen dioxide and oxygen. The NO 2 input concentration are determined by: where: [NO 2 input] [NO input] - [NO reading] = ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ NO slope [NO input] = analyzer's NO channel response to the NO span prior to the addition of O 3 [NO reading] = analyzer's NO response after the addition of O 3 NO slope = slope of the curve generated by linear regression of the NO concentrations versus the analyzer's response during the audit of the NO channel, where the NO input is the abscissa and the NO response is the ordinate The final stage of the analyzer audit is to determine the converter efficiency from the following relationships: [NO y initial] - [NO y final] [NO 2 converted] = [NO 2 input] ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ NO y slope where: [NO y initial] = analyzer's NO y channel response before the addition of O 3 [NO y final] = analyzer's NO y response after the input sample of NO is titrated with O 3 NO y slope = slope obtained from the audit of the NO y channel Chapter 4: QUALITY ASSURANCE 4-21
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Central California Ozone Study (CCO
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CCOS Field Operations Plan Version
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CCOS Field Operations Plan (DRAFT)
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Page 71 and 72: CCOS Field Operations Plan Version
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Page 167 and 168: Appendix A CCOS Contact List (a) Re
Page 170 and 171: APPENDIX B Air Quality Monitoring S
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APPENDIX B (continued) Air Quality
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APPENDIX B (continued) Air Quality
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C. MEASUREMENT METHODS Field monito
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these sensors are sufficiently good
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the position of the balloon with re
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The ozone/ethylene chemiluminescenc
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C.5 Supplemental Measurements of Ox
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from the collection surface without
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hydrocarbons takes place. No Perma-
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Tenax samples are usually analyzed
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λ 2 j = ∫ F λ ×σ λ × φ λ
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A sample of solar radiance data inc
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TABLE OF CONTENTS S0 Sites S1 Sites
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Lambie Road (S0) Address: Location:
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Sloughhouse (S0) Address: Fire Stat
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San Martin (S0) Address: San Martin
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Kettleman City (S0) Address: Locati
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McKittrick (S0) Address: Location:
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Red Hills (East County Monitoring S
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Sutter Butte (S1) Address: Location
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White Cloud (S1) Address: 26533 Sta
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Bodega Bay (S1) Address: Location:
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San Leandro Address: Location: Coor
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. Summary of Responsibilities: Equi
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New Facilities: One phone line for
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New Facilities: None Summary of Res
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Turlock Existing Equipment: Observa
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Summary of Responsibilities: Equipm
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C 2 - C 12 HC from canisters HC Can
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Coefficient of Haze RAC Gas Calibra
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New Facilities: Small trailer, powe
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Observable Instrument Installer O 3
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New Facilities: 8’ x 10’ traile
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Observable Instrument Installer NO/
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Existing Monitoring Equipment (vend
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C 8 - C 20 HC from TENAX DRI Multi-
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Parlier Existing Equipment: Observa
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Camp Roberts (Other) Address: Locat
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Appendix D-2 Supplemental Air Quali
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Bella Vista Bella Vista Water Distr
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South View from Front Gate Southwes
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San Martin San Martin Shelter with
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South View Southwest View West View
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Sutter Butte
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San Leandro
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Bruceville
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west view northwest view
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South View West View
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South View West View
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Pacheco Pass Pacheco Pass Site Nort
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Arvin North View Northeast View Eas
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Sunol Sunol Site, North View East V
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Southwest View West View
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Parlier Instrument Shelter North Vi
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Shasta Lake North View East View So
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Central California Ozone Study (CCOS) - Desert Research Institute

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