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papfore�p • • Department of Health Services <br /> Wemorand'uim <br /> To Linda Hogg Date: August 10 , 1990 <br /> Permitting Unit <br /> From Toxic Substances Control Program <br /> 10151 Croydon Way <br /> 855-7815 <br /> Subject: Lodi/Overhead Door <br /> Surface Impoundment Clean-up <br /> Background: Facility to "clean-close" the old pond. Major <br /> constituents of concern are: Zinc and Nickel. <br /> After excavation, background levels have not <br /> been reached. <br /> Question: Is there a health hazard from the <br /> levels left? <br /> Analysis: The DHS-HML analytical date on metals for HML# <br /> F2400 to HML# F2410 indicate that for nickel, <br /> 7/11 soil sample were below detection level <br /> and the soil samples with the highest <br /> concentration were: F2404 with 171 ppm and <br /> F2408 with 95 ppm. <br /> Zinc was above detection limit in all analyzed <br /> samples with the lowest concentration of 25. 1 <br /> ppm in soil sample # F2409: 25 ppm, and the <br /> highest level in soil sample # F2406: 203 ppm. <br /> Of the two contaminants of concern, Nickel is <br /> classified as a human carcinogen by the <br /> inhalation root under occupational setting. <br /> Nickel , therefore, has the most potential to <br /> elicit adverse health effects. <br /> However, the calculated arithmetic mean of <br /> nickel at the site is 45. 36 ppm and the <br /> geometric mean of 25. 77 ppm, just above the <br /> limit of detection. <br /> On the basis of the analytical data presented, <br /> the levels of nickel and zinc in soil are <br />