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Halaco Engineering Co. IA Section 3 CAD009688052 12" sodium iodide gamma probe encased on five sides by lead shielding. The detector is tied into a global positioning system that allows for mapping the gamma results. The detector was suspended approximately 12 to 18 inches from the ground surface as the tractor traversed the target areas. The data were plotted on site maps and were used to identify areas of concern for sampling. The tractor-mounted gamma detector was used to screen unimproved areas in the Smelter Area, the WDA, the surface of the WMU, the NCL-east, and along Ormond Beach. Great care was used to ensure that the tractor did not disturb local wildlife (nesting sites were mapped out by a Department of Fish and Game (DFG) contractor, and a safety perimeter was enforced), and the ERGS was not used in the wetlands at all. The resulting data maps are presented in Appendix I. The ERGS results showed significant (greater than two standard deviations above the median background range) gamma anomalies in the Smelter Area, WDA, NCL-east, and the Ormond Beach areas; these areas were targeted for further inspection and sampling during the course of the field work. No significant anomalies were identified in the WMU. 3.2.1.3 Definitive Metals Results Of the 397 samples collected at the Site, WESTON® submitted 117 solid-matrix samples for definitive analysis for metals by EPA Method 6010B. The laboratory results for solid matrix samples are presented in Table 3-2 and are broken out by matrix (soil, sediment, solid waste), area, and background designation. Laboratory data packages are included in Appendix H. In addition, ERS Removal considerations and associated statistical rendering of analytical data are presented in Appendix J. The definitive metals results for soils include samples collected from the Smelter Area (six samples), the NCL-east (eight samples) located directly east of the WMA, agricultural soils (two samples), residential soils (two samples), and a background area (six samples) located west of the Site. All soil samples are compared directly with the background suite; the high and average values for each analyte are presented in Table 3-2. Soil sample results that are significantly elevated with respect background are presented in boldface for each analyte; “significantly elevated” is defined as exceeding three times the highest background value for each analyte. All soil samples from the Smelter Area, and seven of the eight samples from the NCL-east area exceeded three-times background for one or more metals. None of the results from the residential and agricultural samples exceeded three-times background. Sample locations are plotted on Figures 3-1 and 3-2. Metals results from the soils are compared to residential Preliminary Remediation Goals (PRG) values. PRGs are “screening level” guidelines used by EPA to evaluate risks from chemical contaminants. PRGs are available for various media (soil, water, air) and for different exposure scenarios (e.g. soil in a residential area, soil in an industrial area, water used as drinking water supply). In this study, metals results in soils are compared to Residential PRGs, which are several times lower than Industrial PRGs. In most, but not all cases, no further action or study is 14
Halaco Engineering Co. IA Section 3 CAD009688052 warranted if contaminant concentrations are less than PRGs. If contaminant concentration exceeds a PRG, further evaluation is usually appropriate. Exceeding a PRG does not necessarily imply that risks are at unacceptable levels and that cleanup is needed. None of the background soil samples exceeds the PRG values; in addition, none of the metals results for the residential or agricultural soils exceed these action levels. Of the soils collected in the NCL-east, six of the eight samples exceed the PRG for at least one of the following metals: Al, Ba, Cr, Cu, Mg, Mn, Pb, and Zn. All six of the surface and subsurface soil samples collected in the Smelter Area exceed both the three-times background threshold and the PRG for at least one of the following metals: Al, Ba, Cr, Cu, Mg, Mn, Pb, and Zn. The definitive metals results for six downgradient marine sediment samples are presented in Table 3-2, along with an additional six background marine sediment samples. Sample results are compared to a value three times the highest background samples, as well as NOAA Screening Quick Reference Table (SQuiRT) values. No marine sediment metals results exceeded threetimes background or exceeded any SQuiRT value. The definitive metals results for six downgradient beach sediment samples are presented in Table 3-2, along with an additional six background beach sediment samples. Sample results are compared to a value of three-times the highest background samples, as well as NOAA SQuiRT values. Five of the six beach sediment samples exceed three-times background for barium; and one sample exceeds three-times background for chromium. None of the beach sediment samples exceed the SQuiRT values. The definitive metals results for ten downgradient surface water sediment samples from the OID are presented in Table 3-2, along with an additional six background OID sediment samples. Sample results are compared to a value of three-times the highest background sample, as well as NOAA SQuiRT values. Five of the ten OID sediment samples have metals results that exceed three-times background for at least one of the following analytes: Al, Ba, Be, Cd, Cr, Cu, Pb, Mg, Ni, and Zn. Three of the four background OID sediment samples exceed the NOAA SQuiRT values for Cd and Zn; eight of the ten downgradient OID sediment samples exceed the NOAA SQuiRT values for at least one of the following analytes: Al, As, Cd, Cr, Co, Cu, Pb, Mn, and Zn. The definitive metals results for six wetland sediment samples from the OID are presented in Table 3-2, along with an additional six background wetland sediment samples. Sample results are compared to a value of three-times the highest background sample, as well as NOAA SQuiRT values. All six downgradient wetland sediment samples have metals results that exceed three-times background for at least one of the following analytes: Al, Be, Cd, Cr, Cu, Co, Pb, Mg, Mn, V, and Zn. All wetlands samples exceed the NOAA SQuiRT values for at least one of the following analytes: Al, As, Cd, Cr, Co, Cu, Pb, Mn, and Zn. 15
Page 1 and 2: Integrated Assessment Halaco Engine
Page 3 and 4: Halaco Engineering Co. IA CAD009688
Page 11 and 12: Halaco Engineering Co. IA Section 1
Page 23: Halaco Engineering Co. IA Section 3
Page 43 and 44: Halaco Engineering Co IA Report Tab
Page 45 and 46: Table 3-2: Metals Analysis - Solid
Page 47 and 48: Table 3-2: Metals Analysis - Solid
Page 49 and 50: Table 3-4: Detectable Volatile Orga
Page 51 and 52: Table 3-6 Radionuclide Data - Water
Page 53 and 54: Table 3-8: Metals Data - Air Matrix
Page 55 and 56: Residential Areas Figure 2-1: Site
Page 57 and 58: B36 $ T Background Soil Sample Area
Page 59 and 60: SDF16 WS10 SDF15 WS9 SDF14 SDF13 WS
Page 61 and 62: Halaco Engineering Co IA Report App

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