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i <br />11 <br />Laboratory QC results were submitted to EMCON along with the analytical results for <br />the soil samples from MW -2. A laboratory blank for EPA Method 624/8240 analyzed <br />on May 25, 1988 contained 8 ug/kg of methylene chloride and 10 ug/kg of 1,1,1 - <br />trichloroethane (TCA). A laboratory blank for EPA Method 625/8270 analyzed on May <br />30, 1988 contained 930 ug/kg of bis (2-ethylhexyl) phthalate. The recoveries for <br />surrogate spikes, matrix spikes, and matrix spike duplicates were within the limits <br />established by the laboratory. RPD values did not exceed 18 percent. <br />Laboratory QC results were submitted to EMCON along with the analytical results for <br />the water sample from MW -5. A laboratory blank for EPA Method 624/8240 analyzed <br />on May 26, 1988 detected no compounds above the reporting limits. A laboratory <br />blank for EPA Method 625/8270 analyzed on May 31, 1988 contained 12 micrograms <br />per liter (ug/1) of di-n-butylphthalate and 34 ug/l of bis (2-ethylhexyl) phthalate. The <br />recovery for surrogate spikes was within the limits established by the laboratory. <br />Laboratory QC results were submitted to EMCON along with the analytical results for <br />the remaining water samples. A laboratory blank for EPA Method 624/8240 analyzed <br />on May 26, 1988 contained 35 ug/l of acetone. A laboratory blank for EPA Method <br />625/8270 analyzed on June 1, 1988 contained 77 ug/1 of bis (2-ethylhexyl) phthalate. <br />The recoveries of surrogate spikes, matrix spikes, and matrix spike duplicates were <br />within the limits established by the laboratory. RPD values did not exceed 9 percent. <br />The presence of acetone, methylene chloride, bis (2-ethyhexyl) phthalate, and di-n- <br />butylphthalate in the laboratory blanks may be attributed to laboratory contamination <br />from the extraction solvents used in analytical procedures and the handling and cleaning <br />of glassware. The one elevated concentration of bis (2-ethylhexyl) phthalate (930 ug/1) <br />is somewhat higher than the concentrations typically encounted. The presence of TCA <br />may be attributed to contamination carry over in the analytical equipment from a highly <br />contaminated sample analyzed prior to the laboratory blank. <br />With the exceptions noted above, the field and laboratory quality control data indicate <br />that the analytical results are of good quality. <br />STL 9390314 20 <br />1 <br />ER1�Y3f1 <br />