Agenda - Council - 05/24/1984 - Laserfiche WebLink

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8a~dtary F_ng~Hng Labc~atc, ies. Inc. 1931 West County Road (32 b't F~ul. Minnesota 55113 mlatmem: (612) 636.7173 RECEIVED 0'~ _ 'q'-I ~ '~ _w~w: JFC). GCW, HAK, DWC,, 'iT. RO. GM, DO, Fi', KO i.:.-._ ,. - April 13, 1984 .:~'.,:,, ~ ~ ,. Mr. Frank Perugtni ".'.-.Waste Nanage.~nt, Inc. ";'"'"""3333 North Mayfatr Road" :.~:;.!;.:.~.Milwaukee, WI 53222 '"'~,,, '~' Dear Mr. Perugini: m i l m m I m As per your request, this letter is intended to outline the methodology and rationale for calculating volatile organic carbon values of samples taken at your Anoka Landfill from July, 1983 through February, 1984. Please refer to Table I. With two exceptions, all analytical values on Table I were confirmed by recalculating the analytical data: (1) On Report #1861 for samples collected on September 9, 1983, benzene should have been reported as <l.0 ug/1. (2) Although the bromomethane value for the sample collected on Oct. 14, 1983 was confirmed by recalculation, this level is a possible instrument carry-over from the Well t8 sample. The solution to alleviate any potential problem of this type in the future will be to analyze the sample from the Terry Miller residence first, before running any of the other samples. Please refer to Table II. This table consists of the methylene chloride results reported from July, 1983 through February, 1984. Recalculation of results · ' confirmed all analytical data. Based on data from our laboratory and field blanks, -:.~.~ no sign of contamination in the Purge and Trap system was detected. A~:]]=I "'" Please r~fer to Table III. Based on original standard responses, the re- ':,/y · calculation of the results in Table III confirmed the values as originally reported ' --'' ...~:~'~ However, due to the large data base available for these six parameters from Well ~8, :r~;'~'" .... the results were recalculated using averages of the six standard responses. By --. using this procedure instead of using individual standard responses, the reported ~-:: values are changed significantly. The rationale for calculating results using average standard responses is as follows: -~';::...~. 1. Standards are prepared prior to each analysis according to EPA Method t601. In this method a five milliliter gas tight syringe is filled with the specific volatile organic compound to be analyzed. The contents of this syringe are then injected into a pre-weighed ten milliliter volumetric flask filled with methanol. The weight increase after injection of the standard is considered to be the ug/ml concen- ~' tration of the standard.