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Ms. Kathy Amaru <br /> Estimates of Contaminants in Soil* Groundwater <br /> PG&E McMullin Natural Gas Dehydration Station <br /> April 25, 2008 <br /> The following equation was used to estimate the remaining mass of each contaminant in groundwater: <br /> G =R X L x W x H x 77 <br /> 2 <br /> Where: <br /> G = The total mass of contaminant remaining in groundwater at the Site; <br /> R = The reporting limit of each contaminant; <br /> L = The length of the Site area; <br /> W= The width of the Site area; <br /> H = Assuming from groundwater level to 16 ft below ground surface; and <br /> n = Soil porosity. <br /> In conclusion, the estimate total mass of TPH and BTEX compounds in soil and'groundwater at the site <br /> is calculated to be 2.02 kg. <br /> Should you have any questions, please contact Andrew Crisp of Parsons at 925-941-3739, or you can <br /> contact me directly at 925-866-5508. <br /> Sincerely, <br /> I � <br /> Robert M. Gray <br /> Consulting Environmental Scientist <br /> Environmental Affairs <br /> RMG: AGC <br /> cc: Andrew Crisp, Parsons Project Manager <br /> Jim Leu, Parsons Project Engineer <br /> Attachments: Table A-- Estimated Contaminants Remaining in Soil at the McMullin Site <br /> Table B— Estimated Contaminants Remaining in Groundwater at the McMullin Site <br /> Figure 1 — Excavation Limits and Verification Sample Locations (Soil Polygons <br /> Depicted) <br /> Page 3 of 3 <br />