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' 0 hn KLEINFELDER ' o Chromium was reported at higher concentrations in the MW-1 blind ' duplicate sample analyzed by CAL/Enseco than by the routine MW-1 samples analyzed by APPL. APPL utilized AA and Enseco utilized ' ICP for these analyses. ' o Although mercury was reported by APPL in all monitoring well samples, it was not detected by CAL/Enseco in the MW-1 blind duplicate sample. Both laboratories used the same detection limit and utilized AA for the analyses. ' o Selenium was reported by CAL/Enseco in the MW-1 blind duplicate sample at a concentration just above the detection limit. It was ' not detected by APPL with a higher detection limit. Both laboratories utilized AA for the analyses. o Thallium was reported by APPL in MW-2 and MW-1 samples at ' concentrations just above the detection limit and approximately equal to the ground water quality objective. Thallium was not detected by CAL/Enseco in the MW-1 blind duplicate sample at a ' lower detection limit. Both laboratories utilized AA for the analyses. ' o Zinc was reported by APPL in all samples including the field ' blank. It was detected at lower concentrations by CAL/Enseco in the MW-1 blind duplicate sample than by APPL in the routine MW-1 ' sample. Both laboratories used the same detection limits; however, Enseco utilized ICP and APPL used AA for the analyses. ' Constituents with reported concentrations equal to or greater than the ground water quality objectives are nickel and nitrate in MW-1 samples, tand nickel, thallium, and nitrate in MW-2 samples. Nickel was reported at lower concentrations in the MW-1 duplicate sample, as measured by ICP, than in the MW-1 routine sample, as measured by AA. Thallium was not detected in the MW-1 blind duplicate sample but was detected in the MW-1 troutine sample. Nitrates were not analyzed by CAL/Enseco. 57-87-621 1 5