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Arvin-Bear Mountain Blvd. Site Replacement Request

This request provides documentation that the Arvin-Di Giorgio (U.S. EPA Air Quality 

System Site ID 060295002) monitoring site is the replacement for the Arvin-Bear 

Mountain Blvd. (Site ID 060295001) monitoring site. Detailed site information for 

Arvin-Bear Mountain Blvd. and Arvin-Di Giorgio can be found in the San Joaquin Valley 

Air Pollution Control District’s 2010 and 2015 Air Monitoring Network Plans, 

respectively.

History of the Arvin-Bear Mountain Blvd. Monitoring Site

Arvin-Bear Mountain Blvd. began collecting ozone data in June of 1989. The site was 

located at 20401 East Bear Mountain Blvd., approximately 2.5 miles east of the town of 

Arvin. The intended purpose was as a high site for the Bakersfield Metropolitan 

Statistical Area.

Figure 1: Ozone Monitoring Sites in the Bakersfield

Metropolitan Statistical Area1

Arvin-Bear Mountain Blvd. operated continuously for 21 years. During that time, the 

highest 8-hour and 1-hour ozone design values and number of exceedance days in the 

Bakersfield Metropolitan Statistical Area generally occurred at either Arvin-Bear 

Mountain Blvd. or one of its neighboring sites, Edison (Site ID 060290007).

 

1 Exclusive of the Mojave-923 Poole Street site, which is 55 miles east-southeast of Bakersfield in the 

Eastern Kern Nonattainment Area.
2

Arvin-Bear Mountain Blvd. was designated a State/Local Air Monitoring Station 

(SLAMS) site. Throughout its existence, in addition to hourly ozone data, the site 

collected hourly nitrogen dioxide, hourly nitric oxide, and hourly oxides of nitrogen data. 

Starting in July of 1995, Arvin-Bear Mountain Blvd. also collected canister-based 3-hour 

non-methane organic compounds (every 12 days).

Arvin-Bear Mountain Blvd. Characteristics

Arvin-Bear Mountain Blvd. was located in a rural-agricultural area at the Arvin-Edison 

Water Storage District facilities at 20401 East Bear Mountain Blvd. (see Figure 2

below). Other than these facilities, there is no urban development nearby. Local land 

use is agriculture, with vineyards to the south and east, orchards to the north, and 

vacant land to the west. Local topography is flat, with rising foothills approximately 1.5 

miles to the southeast. The ozone monitor at Arvin-Bear Mountain Blvd. was 

designated as a "neighborhood scale" monitor. Under Appendix D to 40 CFR §58, a 

neighborhood scale monitor “Defines concentrations within some extended area of the 

city that has relatively uniform land use with dimensions in the 0.5 to 4.0 kilometers 

range. The neighborhood and urban scales . . . have the potential to overlap in 

applications that concern secondarily formed or homogeneously distributed air 

pollutants.”

Figure 2: Arvin-Bear Mountain Blvd. Monitor Location
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Lease Termination

In July of 2009, the Arvin-Edison Water Storage District notified the Air Resources 

Board that it was letting the lease that allowed ARB to operate Arvin-Bear Mountain 

Blvd. on the Water Storage District's property expire on August 31, 2009. The Water 

Storage District directed ARB to remove its equipment from the site by that date. ARB 

immediately began a search for a replacement site. 40 CFR §58.14(c)(6) states, "A 

SLAMS monitor not eligible for removal under any of the criteria in paragraphs (c)(1) 

through (c)(5) of this section may be moved to a nearby location with the same scale of 

representation if logistical problems beyond the State's control make it impossible to 

continue operation at its current site." As a result, ARB staff initiated a systematic and 

intensive search for potential replacement site locations that were as nearby as practical 

considerations allowed and had the same spatial scale of representation.

ARB also communicated with the Water Storage District with the goal of keeping 

Arvin-Bear Mountain Blvd. in operation. Despite these efforts, the Water Storage 

District chose to terminate the lease and have the monitoring equipment removed from 

their property. Officials from the San Joaquin Valley Air Pollution Control District 

successfully negotiated with the Water Storage District to allow Arvin-Bear Mountain 

Blvd. to remain in operation for another year to allow parallel monitoring with the 

replacement site. By mid-November 2009, Arvin-Di Giorgio (the chosen replacement 

site) began operation. Arvin-Bear Mountain Blvd. shut down on November 1, 2010, 

allowing for almost a year of parallel ozone monitoring at the two Arvin sites.

Replacements Considered

As part of the site replacement evaluation process, ARB staff reviewed ARB siting 

criteria (see http://www.arb.ca.gov/airwebmanual/aqsbdocs1/V2/v2sec2.0.4.pdf, section 

2.0.4.4), generated meteorological and air quality statistics, reviewed topographical and

satellite image maps to characterize Arvin-Bear Mountain Blvd. and the surrounding 

area. ARB staff considered the local topography and land uses, emissions sources, 

nearby traffic counts, and the predominant wind direction coinciding with high ozone 

concentrations.

Staff compared 1-hour ozone data and wind direction at Arvin-Bear Mountain Blvd. for 

the most recent complete (2008) ozone season (May through October) to determine 

predominant wind direction during 1-hour ozone exceedances, shown below in Figure 3.

The unshaded portion of Figure 3 represents those 1-hour concentrations that 

exceeded the 1-hour ozone standard (i.e., they were above 0.124 ppm). With the 

exception of two outliers that were just above the standard, all the exceedance days fell 

between about 260 degrees ± 30 degrees. In other words, the predominant wind during 

exceeding 1-hour ozone concentrations was coming from slightly south of west, with a 

small spread around that direction. The highest 8-hour averages would occur under 

similar wind conditions as the highest 8-hour averages will always include the highest 

1-hour measurements.
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Figure 3: 1-Hour Ozone Concentration vs. Wind Direction

at Arvin-Bear Mountain Blvd., 2008 Ozone Season

Staff did an initial search for possible replacement sites using these criteria:

1. The site was within five miles of Arvin-Bear Mountain Blvd.,

2. The site had, at a minimum, electricity potentially available without the additional 

delay of adding new power poles, and

3. The site had space where a monitoring structure could be set up.

According to the aforementioned regulations, it was imperative that a replacement 

monitor be placed in a nearby location. ARB performed the extensive search for a 

replacement site within a five mile radius of the Arvin-Bear Mountain Blvd. monitor. 

ARB staff initially identified 31 possible replacement sites, which included businesses, 

schools, farm structures, farm outbuildings, and irrigation infrastructure, as shown in 

Figure 4.
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Figure 4: Locations of the 31 Possible Replacement Sites Considered

The yellow circle in this figure defines a five-mile radius around Arvin-Bear Mountain Blvd.

Arvin-Di Giorgio, the selected replacement, is Site 20 in this Figure.

ARB staff then further reviewed each possible site for compliance with the following 

criteria:

1. The potential site was located on public property (i.e., land controlled by a 

Federal, State, County, City, or Municipal entity)2.

2. A long-term lease was likely to be achieved.

3. The monitoring equipment could be put into operation quickly (no long delays 

from developing site infrastructure, such as adding new power poles, for 

example).

4. The surrounding land use and topography was similar to that at Arvin-Bear 

Mountain Blvd.

5. There was a lack of impact from local NOx (oxides of nitrogen) sources3.

6. There was a lack of impact from urban Arvin sources3.

Due to the lease termination at Arvin-Bear Mountain Blvd. which resulted in a forced 

shutdown and the fact that Arvin-Bear Mountain Blvd. was a maximum concentration 

site, the most important features of a nearby replacement site were that it have a similar 

scale of representation, it be located on public property, and that a long-term lease was 

 

2

The Arvin-Edison Water Storage District is recognized as a “special district,” or a separate local 

government that delivers public services to a particular area. Special districts primarily rely on local 

revenues and are only accountable to the voters or landowners they serve. See the Special Districts 

Annual Report from the State Controller’s Office for more information.

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These criteria addressed concerns that NOx scavenging effects could potentially lower ozone 

concentrations.
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feasible. The same scale of representation means that the replacement site should not 

only have similar land use and surface characteristics, but also that it measure 

concentrations from similar sources to those near Arvin-Bear Mountain Blvd. The need 

for the same scale of representation at the replacement site was met by the last three 

criteria listed above. 

 

Staff evaluated each of the possible sites against the criteria stated above. Many of the 

31 sites failed to meet all the criteria and were eliminated. Some sites met most of the 

criteria and received further evaluation. ARB staff determined that only Sites 19 and 20 

met all the criteria. The following list describes each of the sites and the outcome of 

each evaluation.

Site 1: Irrigation Equipment approximately 0.3 miles east of Arvin-Bear Mountain Blvd.

on East Bear Mountain Blvd. (Latitude: 35.209587, Longitude: -118.771). The 

site was eliminated because it was not on public property and concerns about 

the long-term viability of the site.

Site 2: Farm Structures approximately three-quarters of a mile east-northeast of 

Arvin-Bear Mountain Blvd., north of East Bear Mountain Blvd. on a farm road 

(35.211685, -118.76203). The site was eliminated because it was not on public 

property and concerns about property access and the ability to obtain a longterm lease.

Site 3: Farm Structures on Richardson Road, 0.1 miles west of Rockpile Road 

(35.216284, -118.7898). The site was eliminated because it was not on public 

property and concerns about the ability to obtain a long-term lease.

Site 4: Farm Structures on Richardson Road halfway between Tower Line Road and 

Rockpile Road (35.216396, -118.797449). The site was eliminated because it 

was not on public property and concerns about the ability to obtain a long-term 

lease.

Site 5: Farm Structures, on Sunset Blvd. halfway between Tower Line Road and 

Rockpile Road (35.223558, -118.796953). The site was eliminated because it 

was not on public property and concerns about the ability to obtain a long-term 

lease.

Site 6: Farm Storage Yard at the southwest corner of Russell Street and Tower Line 

Road (35.230073, -118.807527). The site was eliminated because it was not 

on public property and concerns about the ability to obtain a long-term lease 

and the difficulty of obtaining electricity.

Site 7: Farm Structures on Russell Street, 0.2 miles west of Rockpile Road

(35.230873, -118.79177). The site was eliminated because it was thought not 

to be on public property and concerns about the ability to obtain a long-term 

lease.

Site 8: Farm Structures on Russell Street, one-half mile east of Rockpile Road 

(35.224096, -118.778986). The site was eliminated because it was not on 

public property and concerns about the ability to obtain a long-term lease.

Site 9: Farm Structures on Sunset Blvd., one-half mile east of Rockpile Road 

(35.230108, -118.779772). The site was eliminated because it was not on 

public property and concerns about the ability to obtain a long-term lease.
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Site 10: Farm Structures on Sunset Blvd., one mile east of General Beale Road 

(35.224311, -118.735217). The site was eliminated because it was not on 

public property and concerns about the ability to obtain a long-term lease.

Site 11: Irrigation Facility at the southwest corner of Russell Street and General Beale 

Road (35.23118, -118.753273). The site was eliminated because it was not on 

public property and concerns about the ability to obtain a long-term lease.

Site 12: Irrigation Facility on Russell Street, one-half mile east of General Beale Road 

(35.23121, -118.744222). The site was eliminated because it was not on public 

property and concerns about the ability to obtain a long-term lease.

Site 13: Irrigation Facility on Russell Street, one mile east of General Beale Road 

(35.231257, -118.735693). The site was eliminated because it was not on 

public property and concerns about the ability to obtain a long-term lease.

Site 14: Farm Storage Yard at the northeast corner of Buena Vista Blvd. and General 

Beale Road (35.238549, -118.752283). The site was eliminated because it was 

not on public property and concerns about the ability to obtain a long-term 

lease and the difficulty of obtaining electricity.

Site 15: Farm Structure on Buena Vista Blvd., one-half mile west of General Beale 

Road (35.238305, -118.756952). The site was eliminated because it was not 

on public property and concerns about the ability to obtain a long-term lease.

Site 16: Farm Structure on farm road, one-quarter mile south of Buena Vista Blvd. and 

one-half mile west of General Beale Road (35.235888, -118.761756). The site 

was eliminated because it was not on public property and concerns about the 

ability to obtain a long-term lease.

Site 17: Farm Structures on farm road, one-quarter mile south of Russell Street and 

one-half mile west of General Beale Road (35.227603, -118.761236). The site 

was eliminated because it was not on public property and concerns about the 

ability to obtain a long-term lease.

Site 18: Irrigation Facility on Russell Street at irrigation canal crossing (35.231308, -

118.774048). The site was eliminated because it was not on public property 

and concerns about the ability to obtain a long-term lease.

Site 19: Di Giorgio Elementary School property at the southeast corner of Buena Vista 

Blvd. and Rockpile Road (35.23707, -118.787349). This site met all criteria, 

although there was concern about the potential for vehicular emissions from the 

school's parking lot and student drop-off area, which could lead to reduced 

ozone levels due to NOx scavenging. This site is approximately 2.1 miles 

northwest of Arvin-Bear Mountain Blvd. Adjacent land uses are the school 

facilities directly to the north, orchards north of that, vineyards to the west and 

northwest, and unused land to the south. The topography is flat.

Site 20: Di Giorgio Elementary School property at the northwest corner of Buena Vista 

Blvd. and Rockpile Road (35.239197, -118.788637). This site met all criteria. 

The site is approximately 2.2 miles northwest of Arvin-Bear Mountain Blvd.,

0.1 miles northwest of Di Giorgio Elementary School, but still on school-owned 

property. Adjacent land uses are vineyards to the west and north, orchards to 

the east and southwest, and the school to the southeast. The topography is 

flat.
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Site 21: Farm Structures off of Buena Vista Blvd., one-quarter mile west of Tower Line 

Road, adjacent to the irrigation canal (35.237504, -118.809467). The site was 

eliminated because it was not on public property and concerns about property 

access and the ability to obtain a long-term lease.

Site 22: Winery Buildings at the southeast corner of Bear Mountain Winery Road and 

Palmora Drive (35.257592, -118.833353). The site was eliminated because it 

was not on public property and concerns about the ability to obtain a long-term 

lease.

Site 23: Arvin High School at the northwest corner of Varsity Road and Campus Drive 

(35.218487, -118.835225). This site is approximately 3.4 miles west-northwest 

of Arvin-Bear Mountain Blvd. near the northern urbanized edge of Arvin. 

Adjacent land uses are urbanized development to the south and agriculture to 

the west, north, and east. As a school-owned property, there was the 

possibility for a long-term lease. In addition, infrastructure (electricity and 

security) were present. This site met most criteria, except for a concern of 

being impacted by urban emissions from the city of Arvin and by local vehicular 

emissions.

Site 24: Golf Course, directly east of the intersection of Kenmar Lane and Frick Road 

(35.165317, -118.812206). This site is approximately 3.4 miles southwest of 

Arvin-Bear Mountain Blvd. on the grounds of a privately owned golf course. It 

was eliminated because it was not on public property and concerns about the 

ability to obtain a long-term lease. The golf course is no longer in operation.

Site 25: School in Arvin at 1501 Hood Street in Arvin (Bear Mountain Elementary 

School) (35.202614, -118.839284). This site is approximately 3.6 miles west of 

Arvin-Bear Mountain Blvd. within the urbanized area of Arvin. It was eliminated 

because adjacent land use is urbanized development in all directions, with 

parking areas near the proposed site. Local automotive emissions were likely 

to negatively impact an ozone monitor located there due to NOx scavenging.

Site 26: Office Complex at 1305 Bear Mountain Boulevard (35.208802, -118.839314). 

This site is approximately 3.6 miles west of Arvin-Bear Mountain Blvd. at the 

western urbanized edge of Arvin. It was eliminated because adjacent land 

uses are urbanized development in all directions, specifically residential use to 

the north and south, and light commercial uses (stores and offices) to the east 

and west. The site is located on the area's major east-west thoroughfare. 

Local automotive emissions were likely to negatively impact an ozone monitor 

located there due to NOx scavenging.

Site 27: U.S. EPA Superfund Site at 600 South Derby Street in the city of Arvin 

(35.203117, -118.822618). This site is approximately 2.7 miles west of 

Arvin-Bear Mountain Blvd. on the grounds of a former agricultural chemical 

manufacturer. The site was eliminated because of concerns about 

contamination, disruptions during remediation, and the ability to obtain a longterm lease. It is also notable that adjacent land use—manufacturing and urban 

development—was significantly different from that at Arvin-Bear Mountain Blvd.

Site 28: El Camino Real Elementary School at 911 El Camino Real in the city of Arvin 

(35.185437, -118.835039). This site is approximately 3.7 miles west-southwest 

of Arvin-Bear Mountain Blvd. on Arvin city-owned property. This site was 
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eliminated because nearby dirt fields caused concerns about it not meeting 

U.S. EPA siting criteria for particulate matter (at the time ARB staff was 

considering placing a PM monitor at the replacement site, but that did not come 

to fruition). In addition, the area was scheduled for development, raising 

concerns about ongoing suitability of the site. Adjacent land uses were the 

school to the east, vacant land to the west and south, and urban development 

to the north.

Site 29: South Arvin at approximated 4000 Blue Loop Lane (35.173944, -118.829969). 

This site is approximately 4 miles to the southwest of Arvin-Bear Mountain Blvd.

in a private, gated community between two artificially created skiing lakes. The 

site was eliminated because it was not located on public property, concerns 

about the ability to obtain a long-term lease, and the need for the community 

board's continuing approval for occupying the property.

Site 30: Corner Lot at the northwest corner of El Camino Real and Tejon Highway 

(35.187408, -118.824544). This site is one-half mile east of the El Camino 

Real Elementary School site on land scheduled for development. It was 

eliminated because of concerns about unsuitable local land use (urban 

development to the north and west) and its unsuitably as a long-term site, given 

that it could be developed at any time.

Site 31: Carrot Packing Facility at 830 Sycamore Road (35.196136, -118.816887). This 

site was eliminated because it was not on public property and concerns about 

the ability to obtain a long-term lease.

Selected Site

After reviewing all 31 possible replacement sites, staff determined that the two Di 

Giorgio Elementary School sites (Sites 19 and 20) were the only sites that met all of the 

search criteria. The second Di Giorgio site—Site 20 in the list above—was chosen as 

Arvin-Bear Mountain Blvd.'s replacement. ARB staff judged Site 20 to be preferable to 

Site 19 because it was farther removed from the school's parking and drop-off lots and 

thereby would be less impacted by local vehicular emissions. Site 20 was immediately 

available for lease and had readily available electricity. Land uses adjacent to Site 20 

are similar to those at Arvin-Bear Mountain Blvd., with both sites (i.e., Arvin-Bear 

Mountain Blvd. and Arvin-Di Giorgio) being surrounded by agricultural fields and having 

a light urban use (offices at Arvin-Bear Mountain Blvd., a school at Arvin-Di Giorgio) 

nearby in approximately the same relative position. Local topography at 

Arvin-Di Giorgio is essentially identical to that at Arvin-Bear Mountain Blvd. 

Predominant wind direction and nearby traffic counts are similar at both sites. 

Arvin-Di Giorgio is located on public property and was established to be a long-term site

with the same scale of representation. Arvin-Di Giorgio was also the second closest 

public property site of those considered, being only 2.2 miles (3.5 km) away. ARB 

therefore pursued a formal lease only for Arvin-Di Giorgio.
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Figure 5: Arvin-Di Giorgio Monitor Location

Given Arvin-Bear Mountain Blvd.'s and Arvin-Di Giorgio's similar adjacent land uses and 

the sites' proximity to each other, the expected emissions impacts on both sites were 

similar. Thus, it was anticipated that Arvin-Di Giorgio would produce similar data to that 

of Arvin-Bear Mountain Blvd. Both ozone monitors are designated as "neighborhood

scale" monitors.

Arvin-Di Giorgio started collecting ozone data on November 16, 2009. Arvin-Di Giorgio

and Arvin-Bear Mountain Blvd. operated in parallel from that date until October 31, 2010 

when Arvin-Bear Mountain Blvd. was permanently shut down. The parallel data show 

that 1-hour and 8-hour ozone daily maxima during the May through October 2010 ozone 

season were on average 6-7 parts per billion lower at Arvin-Di Giorgio than at 

Arvin-Bear Mountain Blvd.

Conclusion Based on 2009 Evaluation

At the time of relocation, ARB staff concluded that Arvin-Di Giorgio was the best 

available site to replace Arvin-Bear Mountain Blvd. Staff found that Arvin-Di Giorgio

was as similar a site to Arvin-Bear Mountain Blvd. as was possible to achieve. 

Arvin-Di Giorgio met all the criteria for proximity, permanence (i.e., on public land with a 

long-term lease available), similar land use, existing infrastructure, predominant wind 

direction, lack of impact from local NOx sources, and topography. Given the similarities

between Arvin-Bear Mountain Blvd. and Arvin-Di Giorgio, it was also expected they 

would produce similar ozone data. Additionally, Arvin-Di Giorgio was located in close 

proximity to a school. Because children are extremely vulnerable to the adverse effects 

of air pollution, Arvin-Di Giorgio was seen as a favorable location since it would 
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represent this sensitive segment of the population. ARB staff's comprehensive search 

for an alternative found no other site in the area that would have been a more suitable 

replacement for Arvin-Bear Mountain Blvd.

Subsequent Actions and Evaluations

The information presented above represents what was known and available at the time 

that ARB staff was performing the initial search for a replacement site for Arvin-Bear 

Mountain Blvd. in 2009. Activity surrounding the Arvin-Bear Mountain Blvd. site did not 

end in 2010 when the site was shut down and Arvin-Di Giorgio was established. ARB 

continued efforts to put an ozone monitor back at Arvin-Bear Mountain Blvd. in the 

years following. However, the Water Storage District was not amenable and those

attempts were unsuccessful.

In 2011, the San Joaquin Valley Air Pollution Control District contacted the farmer who 

owned the land north of Bear Mountain Blvd., directly across from the Water Storage 

District facility and the previous Arvin-Bear Mountain Blvd. site. The farmer expressed 

interest in allowing an air monitor on his property. In the 2009 review, ARB staff had 

considered this property (Site 1 listed above is located on this property). However, 

similar to the 2009 assessment, ARB did not further pursue this location because a site 

on the farmer's property would not satisfy the first two site selection criteria regarding 

placement on public property and the potential for a long-term lease.

In 2013, the San Joaquin Valley Air Pollution Control District contracted with Sonoma 

Technology, Inc. to conduct a “saturation study” in which 23 temporary ozone sensors 

were deployed in and around the Arvin area for a six-week period. Two of the main 

goals of the study were: 1) to examine ozone gradients and behavior around the Arvin

area and 2) to provide supporting information to ARB, U.S. EPA, and the San Joaquin 

Valley Air Pollution Control District for decisions related to monitoring in that region. 

The study did not identify any potential alternative site locations to Arvin-Bear Mountain 

Blvd. or Arvin-Di Giorgio that met ARB's site replacement criteria stated above.

In 2015, ARB staff again reviewed the possible replacement sites that were considered 

in 2009. Staff found that all sites were as described in 2009, except that Site 7 was 

found to be on public property. Site 7 is currently occupied by the California 

Department of Food and Agriculture Arvin Field Station. Given that Site 7 and 

Arvin-Di Giorgio have similar surrounding land uses and are approximately the same 

distance (1.8 and 2.2 miles, respectively) and direction (north-northwest) from 

Arvin-Bear Mountain Blvd., ARB staff expect that there would be no difference in ozone 

measurements taken at Site 7 and Arvin-Di Giorgio and that any relationship between 

Arvin-Bear Mountain Blvd. and Arvin-Di Giorgio would also apply to Arvin-Bear 

Mountain Blvd. and Site 7.

In late 2015, ARB staff became aware of another potential location near Arvin-Bear 

Mountain Blvd. for a replacement ozone site. The Tejon Ranch Conservancy controls

property approximately 0.3 miles east of Arvin-Bear Mountain Blvd. The Tejon Ranch 

Conservancy, while not a government entity, is an independent non-profit organization
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formed by an agreement between the Tejon Ranch Company, Audubon California, the 

Endangered Habitats League, the Natural Resources Defense Council, the Planning 

and Conservation League, and the Sierra Club.

Figure 6: Proposed Tejon Ranch Conservancy Monitor Location

ARB, in consultation with U.S. EPA, pursued the possibility of establishing a 

replacement for Arvin-Bear Mountain Blvd. on the Tejon Ranch Conservancy property. 

In March 2016, ARB's Monitoring and Laboratory Division contacted Tejon Ranch 

Conservancy formally requesting permission to establish an ozone monitoring site on 

the property (see Attachment 1). Tejon Ranch Conservancy replied shortly thereafter 

that it would not be possible to use Tejon Ranch Conservancy land for that purpose 

(see Attachment 2).

Conclusion

In 2009, given the criteria listed above, ARB staff concluded that Arvin-Di Giorgio was 

the best available site to replace Arvin-Bear Mountain Blvd, in accordance with 

40 CFR §58.14(c)(6). Since then, staff has reevaluated other possible locations, 

namely Site 1, Site 7 and the Tejon Ranch Conservancy property. Site 1 continues not 

to meet replacement site criteria. Site 7 reflects the same conditions as 

Arvin-Di Giorgio, so is expected to produce similar ozone measurements as 

Arvin-Di Giorgio. The Tejon Ranch Conservancy property proved to be unavailable.

ARB staff's conclusion has therefore not changed: the ongoing and comprehensive 

search for a replacement site meeting the criteria listed above with the same scale of 

representation as Arvin-Bear Mountain Blvd. found no other site in the area that would 
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have been a more suitable replacement for Arvin-Bear Mountain Blvd. than 

Arvin-Di Giorgio.