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Transmittal Letter Walnut Creek California 94597 To: Copies: Tel 925 274 1100 Tony Natera/DTSC Bob Gray/PG&E Fax 925 274 1103 Jeff Gove/BAAQMD Don Carpenter/ARCADIS

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Transmittal Letter Walnut Creek California 94597 To: Copies: Tel 925 274 1100 Tony Natera/DTSC Bob Gray/PG&E Fax 925 274 1103 Jeff Gove/BAAQMD Don Carpenter/ARCADIS ARCADIS U.S., Inc. 2999 Oak Road Suite 300 Transmittal Letter Walnut Creek California 94597 To: Copies: Tel 925 274 1100 Tony Natera/DTSC Bob Gray/PG&E Fax 925 274 1103 Jeff Gove/BAAQMD Don Carpenter/ARCADIS Dave Montanari/ARCADIS Matt Nicely/ARCADIS Greg Ertel/ARCADIS Josh Gravenmier/ARCADIS Bridgette DeShields/ARCADIS Chris Lutes/ARCADIS Kim Walsh/ARCADIS From: Date: Aaron Svitana/ARCADIS February 12, 2012 Subject: ARCADIS Project No.: Draft Data Transmittal B0092353.0003 Preliminary Air Sampling – January 2012 Shell Pond, Bay Point, California We are sending you: Attached Under Separate Cover Via the Following Items: Shop Drawings Plans Specifications Change Order Prints Samples Copy of Letter Reports Other: Please see below. Copies Date Drawing No. Rev. Description Action* 1 2/12/12 DRAFT January 2012 Air Data Tables AS 1 2/12/12 January 2012 Ambient Air and Field-Constructed Flux AS Chamber Laboratory Analytical Data Reports 1 2/12/12 Table 1 Return Water Sample Results from Monthly Phase AS 2 Summary Report to RWQCB for January 2012 1 2/12/12 January 2012 Return Water Laboratory Analytical Data AS Reports Action* A Approved CR Correct and Resubmit Resubmit Copies AN Approved As Noted F File Return Copies AS As Requested FA For Approval Review and Comment Other: Mailing Method U.S. Postal Service 1st Class Courier/Hand Delivery FedEx Priority Overnight FedEx 2-Day Delivery Certified/Registered Mail United Parcel Service (UPS) FedEx Standard Overnight FedEx Economy Other: Electronic Mail Page: 1/3 Comments: Please see below. BACKGROUND ARCADIS is providing construction and environmental consulting services to PG&E to implement the Corrective Measures Implementation Plan (CMIP) for the Shell Pond and Carbon Black Area property, Bay Point, California. The general scope of this project is to hydraulically dredge and mechanically remove non-native material (NNM) and chemically-affected soil, and create a self-sustaining wetland. Twenty four (24) hour per day hydraulic dredging operations commenced on January 9, 2012 and were temporarily suspended on January 13, 2012 due to community complaints regarding odors. On January 13, 2012 resources, materials and equipment were mobilized to install a perimeter wind fence and 20-foot high misting system around the perimeter of the materials handling area (MHA). After the perimeter wind fence and misting system was installed and operational, hydraulic dredging operations were resumed the morning of January 19, 2012. Hydraulic dredging was suspended by noon of that day due to additional community complaints regarding odors. AIR DATA In response to greater than anticipated odor the week of January 13, 2012 during full-scale hydraulic dredging of Shell Pond and dewatering of NNM, ARCADIS mobilized just after dredging was suspended on January 19, to assess the site conditions and collect ambient air samples from three locations: upwind of the materials handling area (MHA) in the general location of the Carbon Black Area (CBA) (SP-A-UP-011912), downwind at the southwest corner berm of the MHA (SP-A-DOWN-011912), and at the fenceline downwind of the MHA and its odor control systems (SP-A-FENCE-011912). On January 25 and 26, ARCADIS conducted a second round of air sampling from a field-constructed flux chamber operated on site (SP-A-BAG-012512 and SP-A-BAG-012612). A field blank was also collected from the field-constructed flux chamber (SP-A-FB-BAG-012612). Inlet air for the field constructed flux chamber was site air drawn through a small carbon filter. Ambient air samples were analyzed for volatile organic chemicals (VOCs), semi-volatile organic chemicals (SVOCs) and reduced sulfur compounds. Air samples collected from the field-constructed flux chamber were analyzed for VOCs, SVOCs, petroleum hydrocarbons, reduced sulfur compounds, aldehydes, carboxylic acids and amines. Enclosed, please find tables summarizing detected concentrations and the complete analytical results, as well as the analytical laboratory reports. Common reference concentrations (e.g., Cal-OSHA Permissible Exposure Limits and Agency for Toxic Substances and Disease Registry Minimal Risk Levels for intermediate duration inhalation exposure) are also provided in the tables. Odor thresholds from a total of seven independent sources are included in the summary tables to provide insight into the odor potential of the analytes. Odor thresholds are highly variable. RETURN WATER DATA Per the Corrective Measures Implementation Plan (CMIP – ARCADIS, 2011) and the Regional Water Quality Control Board (RWQCB) Conditional 401 Water Quality Certification (RWQCB, August 12, 2011), return water samples were collected and analyzed for metals, total suspended solids (TSS), total petroleum hydrocarbons Page: 2/3 (TPH), polycyclic aromatic hydrocarbons (PAHs) and volatile organic compounds (VOCs). Return water samples were collected daily upon the startup of 24-hour dredging operations. Return water samples were collected from January 9 through January 13, 2012 whereupon 24-hour dredging operations were suspended. Return water samples were collected from a sampling port immediately downstream of the of the return water pumps that moved collected decant water from the GeoTube® dewatering area in the MHA back to Shell Pond. Table 1, enclosed, from the January 2012 Monthly Summary Report to RWQCB contains the return water sampling data. If you have any questions on the attached data, please contact me at 925-360-2313. Page: 3/3 Table 1 January 19, 2012 Air Sampling: TO-15 Detected Compounds Data Report, Preliminary Air Sampling and Analysis Shell Pond, Bay Point, California Sample ID: SP-A-UP-011912 Sample ID: SP-A-DOWN-011912 Sample ID: SP-A-FENCE-011912 Highest Odor Threshold Lowest Odor Threshold ATSDR Minimal Intermediate Inhalation Risk Lower of CHHSL Ambient Concentration MRL Concentration MRL Concentration MRL Levels and RSL Cal-OSHA PEL Data* Concentration Concentration Analyte µg/m3 µg/m! µg/m3 µg/m! µg/m3 µg/m3 (µg/m!) µg/m! µg/m! (µg/m!) Source (µg/m!) Source (µg/m!) Source Ethanol 1.40E+01 6.20E+00 1.60E+01 6.10E+00 1.60E+01 6.60E+00 NA NA 1.90E+06 NA NA 8.29E+06 Moncrieff 1951 2.57E+02 3M Acetone ND 7.90E+00 ND 7.70E+00 1.80E+01 8.30E+00 3.09E+04 3.20E+04 1.20E+06 NA NA 1.50E+06 Dravnieks 1974 1.09E+04 3M Notes: µg/m3 = micrograms per cubic meter ASTDR = Agency for Toxic Substances and Disease Registry Cal-OSHA PEL = California Occupational Safety and Health Administration Permissible Exposure Level CCV = Continuous Calibration Verification CHHSL = California Human Health Screening Level LCS = Laboratory Control Sample MRL = Method Reporting Limit NA = Not Available/Not Applicable ND = Not Detected RSL = USEPA Residential Screening Level, Indoor Residential Air NJ = the identification is based on presumptive evidence; estimated value UJ = Non-detected compound associated with low bias in the CCV and/or LCS *Ambient Data presented is the greater of the CA Resources Board Monitoring and the West Oakland Monitoring Study (WOMS) results Shell Pond Bay Point-Jan_2012 Ambient Air Data.xlsx/T 1_ATL TO-15 Hits Only 2/10/2012 ARCADIS Page 1 of 1 Table 2 January 19, 2012 Air Sampling: TO-17 Detected Compounds Data Report, Preliminary Air Sampling and Analysis Shell Pond, Bay Point, California Sample ID: SP-A-UP-011912 Sample ID: SP-A-DOWN-011912 Sample ID: SP-A-FENCE-011912 Sample ID: TB-011912 Highest Odor Threshold Lowest Odor Threshold ATSDR Minimal Intermediate Inhalation Risk Lower of CHHSL Ambient Concentration MRL Concentration MRL Concentration MRL Concentration MRL Levels and RSL Cal-OSHA PEL Data* Concentration Concentration Analyte µg/m! µg/m! µg/m! µg/m! µg/m3 µg/m3 µg/m3 µg/m! (µg/m!) µg/m! µg/m! (µg/m!) Source (µg/m!) Source (µg/m!) Source Isopentane 3.00E+01 2.60E+00 3.60E+02 2.60E+00 3.20E+02 2.90E+00 ND 2.60E+00 NA NA NA NA NA NA NA NA NA Freon 11 2.00E+01 4.90E+00 2.20E+01 4.80E+00 2.50E+01 5.40E+00 ND 4.80E+00 NA 7.30E+02 5.60E+06 NA NA 4.27E+04 3M 2.81E+04 Journal of Applied Technology Freon 113 8.50E+00 6.80E+00 1.00E+01 6.60E+00 1.30E+01 7.40E+00 ND 6.60E+00 NA NA NA NA NA 3.73E+06 3M 3.45E+05 Journal of Applied Technology Hexane 7.70E+00 3.10E+00 8.60E+00 3.00E+00 1.30E+01 3.40E+00 ND 3.00E+00 NA 7.30E+02 1.80E+05 NA NA 8.75E+05 Patty 1929 7.73E+04 3M Benzene 1.50E+01 2.80E+00 1.50E+01 2.80E+00 2.30E+01 3.10E+00 ND 2.80E+00 1.92E+01 3.10E-01 NA 1.82E+00 CA Resources Board 3.80E+05 Dravnieks 1974 8.80E+03 Schley 1934 Carbon Tetrachloride 9.30E+00 5.50E+00 1.10E+01 5.40E+00 6.60E+00 6.00E+00 ND 5.40E+00 1.89E+02 4.10E-01 1.26E+04 5.16E-01 CA Resources Board 3.80E+06 Dravnieks 1974 1.32E+05 Leonardus 1969 Cyclohexane 3.00E+00 3.00E+00 3.20E+00 2.90E+00 3.80E+00 3.30E+00 ND 2.90E+00 NA 6.30E+03 1.05E+06 NA NA 2.70E+06 Dravnieks 1974 3.56E+04 Stone 1972 2,2,4-Trimethylpentane 5.50E+00 4.10E+00 6.10E+00 4.00E+00 8.60E+00 4.50E+00 ND 4.00E+00 NA NA NA NA NA NA NA NA NA Heptane 6.20E+00 3.60E+00 7.00E+00 3.50E+00 9.80E+00 3.90E+00 ND 3.50E+00 NA NA 1.60E+06 NA NA 9.43E+05 Odor Thresholds 4.01E+04 3M Methylcyclohexane ND 3.50E+00 4.60E+00 3.40E+00 5.00E+00 3.80E+00 ND 3.40E+00 NA NA NA NA NA 2.53E+06 Journal of Applied Technology 2.01E+06 3M Toluene 2.30E+01 3.30E+00 4.00E+01 3.30E+00 5.30E+01 3.60E+00 ND 3.30E+00 NA 5.20E+03 1.88E+05 4.30E+00 CA Resources Board 2.60E+05 May 1966 8.00E+01 Nader 1958 Ethyl Benzene 4.90E+00 3.80E+00 1.50E+01 3.70E+00 1.60E+01 4.10E+00 ND 3.70E+00 8.68E+03 9.70E+01 4.35E+05 1.30E+00 CA Resources Board 9.98E+03 3M 4.00E+02 Koster 1971 m,p-Xylene 1.50E+01 3.80E+00 1.80E+01 3.70E+00 2.60E+01
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