Fw: Surface Characteristics and Receptor Network Information

Cleveland Holladay 

to: 

Omer Shalev 

07/31/2012 12:38 PM 

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From: Cleveland Holladay/R9/USEPA/US 

To: Omer Shalev/R9/USEPA/US@EPA 

2 Attachments 

Omer, 

Hereis another e-mail from Eric. You should already have this one, though. 

-Cleve 

Cleve Holladay

Phone 415-947-4140 

U.S. EPA, Region 9, Air Quality Analysis Office (AIR-7) | 75 Hawthorne St., San Francisco, CA 

 94105 

-----Forwarded by Cleveland Holladay/R9/USEPA/US on 07/31/2012 12:36PM -----

To: Cleveland Holladay/R9/USEPA/US@EPA 

From: Eric Albright <ealbright@environcorp.com>

Date: 06/27/2012 04:08PM 

Cc: Omer Shalev/R9/USEPA/US@EPA, Dave Brown <DBrown@spi-ind.com>, George Emmerson 

<GEMMERSON@spi-ind.com>

Subject: Surface Characteristics and Receptor Network Information 

(See attached file: Surface Characteristics, Land Use & Receptor Locations.docx)

Cleveland: 

Image.image003.jpg@01CD547F.0A0B87C0.jpg Surface Characteristics, Land Use & Receptor Locations.docx

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Attached are Tables 1 and 2 that provide the surface characteristics around the meteorological 

tower at Redding airport and around the SPI facility in Anderson, California. The airport is located 

approximately 4.5 kilometers (km), or 2.8 miles, from the facility. I’ve also attached Figures 1 

and 2 showing the land use data that provided the basis for the surface characteristics. 

 

Terrain elevations for receptors and emission sources were prepared using 1/3rd arc-second 

National Elevation Dataset (NED) data developed by the United States Geological Survey (USGS), 

and available on the internet from the USGS Seamless Data Server 

(http://seamless.usgs.gov/index.php). These data have a horizontal spatial resolution of 

approximately 10 meters (m). Terrain heights surrounding the facility indicate that some of the 

receptors used in the simulations were located in intermediate or complex terrain (above stack or 

plume height). 

 

For all analyses except 1-hour average NO2, receptors were spaced 500 m apart covering the 10-

km square simulation domain, with 200-m, 50-m, and 25-m spacing receptors grids covering 5-

km, 2.5-km, and 1.25-km nested square areas centered on the facility, respectively. Receptors 

were also located at 25-m intervals along the facility property boundary. The final receptor 

locations are shown in the attached Figure 3. For the 1-hour average NO2analysis, the modeling 

domain was extended to 20 km, and the additional area was covered by receptors placed 500 m 

apart. The final receptor locations for the 1-hour average NO2 analysis are shown in the attached 

Figure 4. 

 

Please let me know if you need anything else. 

 

Thanks. 

 

Eric 

 

 

Eric Albright, PE | Senior Manager

ENVIRON International Corporation

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ealbright@environcorp.com

 

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