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St-oto of California Deportment of Health Sarvic*s Memorandum 7o Jim Tj osvold Date : April 29, 1988 Senior Waste Management Engineer 5"bi°ct' PRELIMINARY PHEA AT MCCORMICK & BAXTER From �Q Jeff Van Slooten�� Associate Hazard s Materials Specialist McCormick and Baxter has presented their draft "Preliminary Public Health Risk Assessment" , dated January 18 , 1988. The report concludes that conditions at the site do not present an imminent public health threat. It states that the highest exposed population is onsite workers from use of the application process. Other potentially exposed populations, that were evaluated, include: 1) workers at downwind facilities; 2) trespassers who use the bank to fish; and 3) workers at the Stockton Wastewater Facility. Residents in the area were not described as potential receptors because the existing physical barriers limit their exposure to contaminated dust. Also, the residents were described as having no exposure to groundwater, and no surface water contact. Exposure concentrations for workers were based on air exposure to products at the facility. The report states that levels in soils are far less than air exposure to products. Air samples were collected, in 1986, from four employees at M&B. The employees include two retort workers,the site engineer, and a maintenance man. Samples were tested for arsenic, copper, and zinc. The levels found were from ten to thousands times lower than OSHA PELs. No air samples were taken for organics. The report uses studies by NIOSH (1981) and USDA (1980) to conclude that the exposure concentrations for organics were acceptable. Exposure concentrations to downwind offsite workers was calculated using air quality modeling. The contaminants modeled were pentachlorophenol and arsenic and calculated to be over 200 times and 3 times, respectively, lower than OSHA PELs. An evaluation of the exposure to trespassers, via ingestion, could not be performed, due to insufficient soil concentration data in the fishing area. Workers at the Stockton Wastewater Facility were not considered because of dilution prior to contact.