Laserfiche WebLink
Mr. Rod Gonzales <br /> Page 2 <br /> March 13 , 1990 <br /> provides a comparison of concentrations before and after the <br /> facility. Each sampling round is described as an episode <br /> containing three samples, one upwind and two downwind. <br /> The air samples collected at Cedar Products did not detect <br /> pentachlorophenol in either episode. Inhalable arsenic was <br /> detected above background levels in episode 5, but was not <br /> confirmed in episode 6. <br /> Based on the preliminary data collected by DHS, theoretical <br /> excess lifetime cancer risks were calculated for <br /> pentachlorophenol and arsenic (Table 2) . Two scenarios were <br /> used for comparison. One was for a resident exposed to an <br /> average measured concentrations for 70 years. The second <br /> scenario was a worker exposed for 47 years. Exposure points <br /> considered were upwind, at the main gate (downwind) , and at <br /> Cedar Products. <br /> It should be emphasized that these calculations are only <br /> theoretical and do not reflect a true estimation of cancer <br /> risk. The true cancer risk may be less and could even be <br /> zero. These calculations were based upon the assumption that <br /> the chemical of concern was present in air at a value equal <br /> to 1/2 the detection limit. Such an assumption is standard, <br /> but should only be applied where there is certainty that the <br /> chemical is indeed present in the sample. Such certainty is <br /> lacking for the air samples taken by DHS at Cedar Products. <br /> Since the air sampling results indicate elevated levels of <br /> air born arsenic and pentachlorophenol were present on the <br /> M&B facility, DHS is concerned that these substances may be <br /> emitted into the air from the M&B facility and may disperse <br /> into the surrounding community. Therefore, M&B will perform <br /> more intensive air sampling and analysis. The air sampling <br /> effort by M&B will be a one-year in depth effort, and will <br /> consist of taking air samples at specific receptor points, <br /> such as Cedar Products. <br /> If you have difficulty interpreting the data or information <br /> contained in this letter, please feel free to contact me at <br /> (916) 855-7897. We will keep you informed of further <br /> progress in this matter. <br /> Sincerely, <br /> Jeff Van Slooten <br /> Associate Hazardous Materials <br /> Specialist <br /> Attachment <br /> cc: See next page. <br />