PhotosClick on the thumbnails below to see full size photos of the facility. |
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| Most recent inventory of toxic air contaminants: | 2003 |
Health Risk Assessment Results
| Below are the results of the health risk
assessments (HRAs) performed on toxic emission inventories from 1991, 1994,
1998 and 2003.
Increased cancer risk is expressed as the number of individuals affected in a hypothetical population of one million. A significant risk is defined as 10 in one million or greater. Non-cancer acute (short-term) and chronic (long-term) related illnesses are conveyed in terms of the Hazard Index (HI). The HI is a ratio of the predicted concentration of the facility’s reported emissions to a concentration considered acceptable to public health professionals. A significant risk is defined as an HI of 1 or greater. The risk footprints are maps of the area affected. The facility is required to notify the people living within the footprints. Footprints are only prepared for significant risks. Footprints are only prepared for significant risks. The footprints will change as the facility reduces its emissions and may not reflect the current risk footprint. |
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| 1991 | 1994 | 1998 | 2003* | |
| Cancer risk: | 29 in a million footprint |
37 in a million footprint |
22.58 in a
million footprint |
5.74 in a million not significant |
| Acute non-cancer risk: |
HI = 9.4 footprint |
HI = 12.6 footprint |
HI = 4.53 footprint |
HI = 1.98 |
| Chronic non-cancer risk: | HI = 0.5 not significant |
HI = 0.5 not significant |
HI = 0.33 not significant |
HI = 0.11 not significant |
*The Greka Zaca Field risk scores are currently under review by Greka and the APCD; the risk shown here represents the APCD’s latest modeled estimate, based on Greka-submitted information. The footprints have not yet been generated for this risk result.
Pollutants
Risk "Driver" Pollutants
Acrolein is the primary contributor to this facility’s significant risk status. Acrolein is a combustion product of internal combustion engines operating on field gas.
The links provided, if available, to the USEPA Unified Air Toxics Web Site Health Effects Notebook for Hazardous Air Pollutants.
Links to chemical
information will open a new browser window the first time you click one. After
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Acute non-cancer: acrolein (endpoint = respiratory system)
- EPA hazard summary
Other Toxic Pollutants Emitted by this Facility
The following pollutants are products of oil processing, storage, and transfer, well repair, and routine maintenance work, but are not the primary contributors to this facility's significant risk status.
acetaldehyde
- EPA hazard summaryaluminum
arsenic
- EPA hazard summaryammonia
antimony
- EPA hazard summarybarium
benzene
- EPA hazard summaryberyllium
- EPA hazard summary1,3-butadiene
- EPA hazard summarycadmium
- EPA hazard summarycarbon tetrachloride
- EPA hazard summarychlorobenzene
- EPA hazard summarychloroform
- EPA hazard summarycobalt
- EPA hazard summarycopper
p-dichlorobenzene
- EPA hazard summary1,1-dichloroethane
- EPA hazard summary1,2-dichloropropane
- EPA hazard summary1,3-dichloropropene
- EPA hazard summaryethylbenzene
ethylene dibromide
- EPA hazard summaryethylene dichloride
- EPA hazard summaryformaldehyde
- EPA hazard summaryhexavalent chromium
- EPA hazard summaryhexane
- EPA hazard summaryhydrogen sulfide
manganese
- EPA hazard summarymercury
- EPA hazard summarymethanol
- EPA hazard summarymethylene chloride
- EPA hazard summarynaphthalene
- EPA hazard summarynickel
- EPA hazard summarypolycyclic aromatic hydrocarbon (PAH)
- EPA hazard summarypropylene
selenium
- EPA hazard summarystyrene
- EPA hazard summarytoluene
- EPA hazard summary1,1,2,2-tetrachloroethane
- EPA hazard summary1,1,2-trichloroethane
- EPA hazard summaryvanadium
vinyl chloride
- EPA hazard summaryxylene
- EPA hazard summaryzinc
Public Notification
The primary goal of notification under the Air Toxics "Hot Spots" Program is to inform potentially exposed individuals of significant health risks associated with toxic air emissions routinely released from facilities in Santa Barbara County. The public notification letter for this facility was sent to the affected public on April 26, 1999.
Risk Reduction
Because of the facility's significant risk status, the facility operator is required to conduct an airborne toxic risk reduction audit and develop a plan to implement risk reduction measures.
Greka Zaca Field's first Risk Reduction Audit and Plan (RRAP) was reviewed and deemed incomplete by the APCD. A revised plan was submitted on January 26, 2001. As part of the revised plan, the Zaca Field facility was required to submit an updated Air Toxics Emission Inventory Plan and Report.
Links for Additional Information on Air Toxics
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