Central California Ozone Study (CCOS) - Desert Research Institute

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CCOS Field Operations Plan Version 2: 5/31/00 Total nonmethane hydrocarbon (NMHC) concentrations are also measured by analysis of the canister samples by preconcentration direct injection flame ionization detection (PDFID). Total NMHC is measured by passing the air sample through a chromatographic column to separate methane from other hydrocarbons and analyzing the bulk hydrocarbon sample by FID. In the FID, sample air is burned in a hydrogen flame creating a quantity of ions from the hydrogen molecules in the air sample. The ions conduct a small electrical current which is measured by an electrometer, which in turn produces an electronic signal proportional to the number of ions collected. Thus, the total hydrocarbon data are reported as parts per billion carbon (ppbC). Total nonmethane hydrocarbon (NMHC) concentrations are monitored continuously on an hourly basis at all Sacramento and San Joaquin Valley PAMS sites by either automated-Preconcentration Direct Injection Flame Ionization Detection (PDFID) (e.g., Xontech 850) or TEI 55C. Recent modifications of the TEI55C (Ventura option) provide improved limit of detection (from 150 ppbC to 75 ppbC). 2.3.3 Surface Meteorological Networks The existing meteorological network in central California is extensive, but uncoordinated among the different agencies. Figure 2.3-1 shows the locations of surface meteorological monitoring sites operated by the Air Resources Board (ARB), the Bay Area Air Quality Management District (BAAQMD), the National Oceanic and Atmospheric Administration (NOAA), the California Irrigation Management Information Service (CIMIS), Interagency Monitoring of PROtected Visual Environments (IMPROVE), the National Weather Service (NWS), Pacific Gas and Electric Company (PG&E), the U.S. Coast Guard, Remote Automated Weather Stations (RAWS) for fire fighting, and a few miscellaneous monitors. Wind speed and direction, temperature, and relative humidity are the most common measurements. The network of surface pressure and solar radiation measurements is also extensive. Three sites measure ultraviolet radiation in the Sacramento Valley, in the San Joaquin Valley, and along the south coast in Santa Barbara County. Figure 2.3-2 shows the surface meteorological observables measured at each monitoring location, regardless of the network from which they are derived. The specific measurements at each site and the networks they belong to are documented in Appendix C of Watson et al., (1998). Thuillier et al. (1994) document the methods used to acquire and report data in most of these networks with their similarities and differences. Wind speed measurements are taken at heights ranging from 2 m to 10 m agl at most sites and temperatures are measured by aspirated and unaspirated thermometers. The major limitations of existing network instrumentation are: 1) wind thresholds of ~1 m/s for most instruments. The existing meteorological network will be augmented with the CCOS supplemental sites described below. Ten meter meteorological towers at each of these sites will be equipped with low threshold (~0.3 m/s) wind sensors and high sensitivity relative humidity sensors. Section 10 describes the monitors available for these measurements. With these supplemental measurements and surface measurements at the upper air sites, the existing surface monitoring network provides adequate coverage for the northern and central California study domain. Chapter 2: FIELD MEASUREMENTS 2-8
CCOS Field Operations Plan Version 2: 5/31/00 Figure 2.3-1. Central California surface meteorological networks and measurement locations. Chapter 2: FIELD MEASUREMENTS 2-9
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Appendix A CCOS Contact List (a) Re
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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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