PUBLIC HEALTH ASSESSMENT
BRIO REFINING, INC.
DIXIE OIL PROCESSOR, INC.
This site is of potential health concern because of the risk to human health resulting from possibleexposure to hazardous substances at concentrations that may result n adverse health effects. Asnoted in the Human Exposure Pathways section above, human exposure to VOCs, PAHs, andmetals may occur via ingestion, dermal absorption, and inhalation.
Public and private utilities provide drinking water to 99.9 percent of the homes within a one-mileradius of the Brio/DOP sites. The available information indicates that the shallow contaminatedaquifers near the site are not normally used for potable purposes because of their low yield andthe availability of municipal water in the area. There is currently no known use of contaminatedgroundwater for human consumption.
The available data for off-site contamination of air and surface soil from the SouthbendSubdivision did not indicate that a significant health risk would be expected to result from contactwith these environmental media. The contamination detected in sediment samples from MudGully south of Dixie Farm Road would not be expected to pose a health concern. No data onsurface water contamination from this portion of the stream were available for assessment.
High concentrations of chemical wastes remain at the site. Inhalation, dermal contact, andingestion of these wastes could pose a potential health risk to on-site workers.
1. General information indicated that an upward hydraulic gradient existed over much of the site. ATSDR believes that the current water level data set (three months) is inadequate to rule outdownward migration of contamination. Monthly water level measurements collected for aminimum of one year would better determine vertical flow direction. A better data set may helpdetermine vertical flow direction. A better data set may help determine if the hydraulic gradient is reversed during seasonal or cyclic events such as recharge events and droughts.
2. We recommend testing of soil from the barren area in the northwest corner of the Brio northsite that adjoins the Southbend Subdivision property line to determine the cause of the vegetativestress.
3. Worker contact with the contaminated on-site soils should be minimized. If remedial activitiesinvolve the excavation of contaminated soils, workers should be provided with protective clothingand respirators in accordance with applicable OSHA regulations and OSHA and Niosh guidelinesand advisories.
Optimal dust control procedures should be implemented to prevent the off-site migration offugitive dusts. Potential remedial worker exposure should be minimized by prohibiting eating andsmoking in contaminated areas and washing after contact with contaminated materials.
In accordance with CERCLA as amended, the Brio Refining, Inc,/Dixie Oil Processors NPL Site,Houston, Texas have been evaluated for appropriate follow-up with respect to health effectsstudies. Inasmuch as there is no extant documentation or indication in the information and datareviewed for this Health Assessment that human exposure to on-site or off-site contaminants iscurrently occurring or has occurred in the past, this site is not being considered for follow-uphealth studies at this time. However, if data become available suggesting that human exposure tosignificant levels of hazardous substances is currently occurring or has occurred in the past,ATSDR will re-evaluate this site for any indicated follow-up.
|ENVIRONMENTAL REVIEWER:||Donald Y. Joe, P.E.|
Environmental Health Engineer
Environmental Engineering Branch
|HEALTH EFFECTS REVIEWER:||Kenneth G. Orloff, Ph.D.|
Health Sciences Branch
|TYPIST:||Charlotta V. Gavin|
Environmental Engineering Branch
|REGIONAL REPRESENTATIVE:||Carl R. Hickam|
Public Health Advisor
Field Operations Branch