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GENESIS ENGINEERING&REDEVELOPMENT <br /> of the Site. Off-site groundwater samples were analyzed for metals, including chromium <br /> (VI). The analytical results of the Off-Site groundwater samples are presented in Table <br /> A-10. Sample locations are depicted on Figure A-10. <br /> Environmental Resource Management <br /> In June 1997, Environmental Resource Management ("ERM") conducted a soil and <br /> groundwater investigation involving the installation of 17 GeoProbe soil borings <br /> (including 2 background borings) and collecting 34 soil and 6 groundwater samples. Soil <br /> samples were collected at approximately 2 and 6 to 7 feet bgs in all of the borings. <br /> Groundwater samples were collected at 6 of the soil sampling locations selected to <br /> provide a preliminary profile of the shallow aquifer underlying the site. All soil and <br /> groundwater samples were analyzed for total petroleum hydrocarbons as diesel and <br /> gasoline using U.S. EPA Method 8015 Modified;benzene, toluene, ethylbenzene, and <br /> total xylenes(`BTEX"); methyl-tert-butyl ether("MTBE") using U.S. EPA Method <br /> 8020; volatile organic compounds ("VOC")using U.S. EPA Method 8010; semivolatile <br /> organic compounds ("SVOC")using U.S. EPA Method 8270; and California Code of <br /> Regulations Title 22 metals using U.S. EPA Method 6010. The analytical results of the <br /> soil samples are similar to those reported in earlier investigations. Previous <br /> investigations did not collect and analyze grab groundwater samples; as such, <br /> comparisons could not be made. The analytical results for the soil samples are presented <br /> in Table A-11 (analysis of organic compounds) and Table A-12 (analysis of Title 22 <br /> metals); analytical results for the groundwater samples are presented in Table A-13 <br /> (analysis of organic compounds) and Table A-14 (analysis of Title 22 metals). Sample <br /> locations are depicted on corresponding Figures A-11,A-12, and A-13. <br /> In December 1998, ERM conducted a follow-up investigation of the southern parcel <br /> consisting of soil sampling using a GeoProbe sampling unit. The follow-up <br /> investigation was intended to provide additional characterization of the drilling mud. A <br /> total of 8 soil borings were advanced with two samples collected from each boring(at <br /> approximately 2 and 6 to 7 feet bgs). No groundwater samples were collected during this <br /> investigation. <br /> Selected soil samples were submitted for one or more of the following analyses: Title 22 <br /> Metals using U.S. EPA Method 6010; Total Barium, Chromium,Mercury, and Lead <br /> using U.S. EPA Method 6000/7000 series; Waste Extraction Test("WET")using citric <br /> acid for sample extraction and analysis for Barium, Chromium, Mercury, and Lead using <br /> U.S. EPA Method 6000/7000 series; Modified WET using deionized water for sample <br /> extraction and analysis for Barium, Chromium, hexavalent Chromium, Mercury, and <br /> Site Investigation Work Plan 6 of 18 <br /> DePaoli Property <br /> November 14,2007 <br />