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Halaco Engineering Co. IA Section 3
CAD009688052
(MTBE). The six downgradient samples exhibited concentrations of all VOC analytes that were
at or below laboratory detection limits.
3.2.3 Air Matrix Samples
Thirty-five air samples were collected from six stations across the Site. The filters were screened
for alpha radiation by EPA On-Scene Coordinator (OSC). There were no detections for alpha
radiation above background concentrations, therefore none of these samples was submitted for
laboratory analysis for radionuclides. The samples were submitted to a laboratory for metals
analyses by EPA Method 6010B. The results for the air filter samples are presented in Table 3-8.
Wind directions during the day were generally out of the west, southwest and northwest. As a
result, the southwest sampling station, AIR1, may be considered the background location for the
duration of the sampling program. Hourly meteorological data from the Oxnard Airport
(distance approximately 2 miles) are presented in Appendix E (25).
Metals results in downwind samples are compared to the background values from AIR1. Under
the HRS, metals concentrations are considered significantly above background if results are
either 1) three-times greater than the concentration detected in the background sample, or 2)
detected in the downwind sample when the analyte has not been detected in the background
sample at a lower detection limit.
Metals were detected in downwind samples on every day that samples were collected. At least
one of the following analytes: Sb, As, Be, Cd, Cu, Pb, Mg, Mn, Ni, Se, and Ag, are significantly
elevated with respect to background in samples collected at air sampling stations 2, 3, 4, and 6
during the sampling period. All of these stations are within one quarter mile of the WMU.
3.2.4 Fish Tissue Samples
Nine fish samples were submitted for whole fish analysis for metals and radionuclide analysis.
The results indicate that radionuclides were not detected in any of the fish samples. The metals
results are presented in Appendix H, and arsenic data are presented in Table 3-9.
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