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State of California Deportment of Health Services <br /> Memorandum <br /> 6 <br /> To James Tjosvold Dc" : February 7,+ 1990 <br /> Senior Waste Management Engineer <br /> subletâ–º: Ambient Air <br /> Monitoring at <br /> McCormick & Baxter <br /> From Toxic Substances Control Program <br /> 10151 Croydon Way <br /> 855-7897 <br /> The Department of Health Services (DHS) has reviewed the results <br /> of ambient air monitoring conducted by DHS ' contractor, Radian <br /> Corporation. The data indicates that emissions exceed DHS <br /> applied action levels (AAL) for pentachlorophenol (PCP) and the <br /> EPA recommended level for arsenic. This air study is preliminary <br /> and will require an additional in-depth study to confirm the <br /> results. <br /> McCormick and Baxter (M&B) prepared a report "Public Health and <br /> Environmental Risk Assessment" (PHERA) in January 1988 . One <br /> scenario examined by the PHERA was exposure to fugitive dust and <br /> vapors from the facility. M&B, using a model, calculated <br /> concintrations for offsite migration. The results were 3100 <br /> ng/m for arsenic and 1. 9 ug/m for PCP. <br /> DHS requested physical confirmation, especially since M&B <br /> proposed to slow down the remediation process. M&B declined to <br /> collect samples and DHS issued a task order to their contractor, <br /> Radian Corporation, to conduct a preliminary air study. <br /> The study consisted of two phases. Phase I was conducted at the <br /> interior of the site near the treatment process areas and/or <br /> highly contaminated soils. The purpose of Phase I was to <br /> confirm the source and measure the magnitudes of the emission. <br /> If Phase I results were below action levels, Phase II would not <br /> be necessary. Phase II was conducted at the property boundary <br /> and at a nearby receptor, California Cedar Products. The purpose <br /> of Phase II was to assess if concentrations leaving the facility <br /> posed a health risk. <br /> Phase I <br /> Radian submitted Phase I Ambient Air Monitoring on <br /> November 20, 1989 . Samplers were located at three downwind <br /> locations within the facility (Figure 1) . Samplers were tested <br /> for total particulate, inhalable particulate, and <br /> pentachlorophenol vapor. Chemicals of interest from particulates <br /> (dust) were arsenic, chromium, and PCP. Sampling frequencies are <br />