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California Occupational Safety and Health Administration because of possible worker exposure. RECOMMENDATIONS 1. The Kearney-KPF site, San Joaquin County, California, has been evaluated by ATSDR's Health Activities Recommendation Panel (HARP) for appropriate followup with respect to health activities. Although there are indications that human exposure to on- or off-site contaminants may be occurring or may have occurred in the past, this site is not being considered for follow-up health studies at this time because there is no identified, non-worker population that is exposed at levels of public health concern. However, if data become available suggesting that human exposure to hazardous substances at levels of public health concern is occurring, or has occurred in the past, ATSDR will reevaluate the site for any indicated followup. Because of possible worker exposure to VOC-contaminated groundwater and heavy metal-contaminated fugitive dusts, this site should be referred to the California Occupational Health and Safety Administration for possible followup. 2. All on-site workers should follow all applicable Occupational Safety and Health Administration (OSHA) regulations and National Institute of Occupational Safety and Health (NIOSH) guidelines to avoid significant exposure to on-site soil contaminants. 3. Continue to limit access to the site to authorized individuals only to prevent ingestion, dermal, or inhalation exposure to the appreciable concentrations of heavy metals in on-site surface soils (sludge) . 4. Perform on-site ambient air monitoring for particulates to determine if contaminated surface soils (sludge) are generating appreciable concentrations of heavy metal-laden fugitive dusts. Additional on-site, surface-soil monitoring is also needed to determine if contaminated fugitive dusts have been transported from the pond or other possible areas of surface-soil contamination (i.e. , drum storage and solvent disposal areas) to other on-site areas via air. If it is determined that appreciable concentrations of contaminated fugitive dusts are being or have been transported via air, appropriate off-site ambient air and surface soil monitoring should be performed that considers potential exposure to nearby sensitive subpopulations (i.e. , children) . 5. Perform additional monitoring of water from several domestic wells that were not sampled during the 1987 RWCQB investigation. Furthermore, water from private and municipal wells, and blended water, if applicable, that was sampled during this investigation, should be monitored on a regular basis. That monitoring should include analyses for VOCs and heavy metals. Those data are needed to determine if human exposure to site contaminants is occurring via ingestion of contaminated groundwater and to determine if the potential exists for bicaccumulation in crops and livestock as a result of watering animals with contaminated groundwater. 11