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Mr. Lloyd G. Schnelle -2- December 12, 1980 <br /> <br />Urban storm water may have COD's ranging from 5 - 3,100 mg/1, <br />while landfill leachate may have COD's in the range of <br />0 - 89,520 mg/1. All of the wells sampled by SERCO with <br />the exception of the temporary well north of the site have very <br />Iow COD's (less than 4 to 16 mg/1). The drinking water <br />samples from the residences are also low (less than 5 to <br />9 mg/1). The results from the temporary well indicate there <br />is some organic contamination appears to be occurring but <br />I am unable to specify the source. <br /> <br />Sodium <br /> <br />Sodium levels in drinking water are potentially of concern <br />to individuals with cardiovascular disease. At the present <br />time there are no federal standards for sodium, but there <br />is a recommendation for a standard of 270 mg/1. The measured <br />values from the residences are all less than 4 mg/1, a very <br />Iow level. SERCO Labs did not analyze for sodium. <br /> <br />The remaining parameters that were analyzed from the drinking <br />water at the residences also show that the landfill has <br />not contaminated the private wells and the water quality <br />is good. It appears from the data collected by SERCO that <br />the temporary well north of the site is experiencing some <br />contamination, but, again, I am unable to comment on the <br />source from the information I have. The remaining test wells <br />look very good. <br /> <br />Enclosed is a revised copy of the drinking water analyses <br />with the results for COD and sodium included. <br /> <br />I hope this letter has answered your questions--if not, or <br />if you have any further questions, please call me. <br /> <br />Sincerely, <br /> <br />Section of Health Risk Assessment <br /> <br />IR/nec <br /> <br />Enclosure <br /> <br /> <br />