SCA. Environmental, Inc.

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2 SC Environmental, Inc. October 11, 2011 Via Mr. David Harnish PG&E 3401 Crow Canyon Rd. San Ramon, C Re: Biweekly Report (September 26 October 7, 2011) Transmission Electron Microscopy (TEM) sbestos ir Sampling Results DMP RIN # NO-0055 Former Hunters Point Power Plant, 1000 Evans venue, San Francisco, C Dear Mr. Harnish: Per the Bay rea ir Quality Management District's letter dated July 13, 2009 that approved the sbestos Dust Mitigation Plan (DMP, RG, 2009) for soil disturbance work at the former Hunters Point Power Plant, attached is a tabulation of the air monitoring results for airborne asbestos analyzed by TEM. ll air testing was performed in accordance with the approved DMP. On several occasions, the TEM results for airborne asbestos exceeded s/cc. The table below lists the activities and the response actions. Date Station ID/rea 9/29 MS6U / Result (s/cc) verage Wind Speed / Direction MPH / NW ctivity Onsite Grading operations. Response ction Soil disturbance activities were suspended after receipt of results. Ensured dust control measures applied to all soil disturbance activities. Expedited 9/30 results were above the trigger level.

3 9/30 MS6U / MS6D / 10/4 MS6U / 10/7 MS6D / MPH / NW 2 MPH / NW MPH / W, NW MPH / S, SE Grading operations. Grading operations. No activity in area due to rain. Soil disturbance activities were suspended after receipt of results. Expedited 10/3 results were below the trigger level. fter thorough evaluation, onsite activities were not the cause of the elevated results. Soil disturbance activities were suspended in this area. Expedited 10/5 results were below the trigger level. fter thorough evaluation, on-site activities were not the cause of the elevated results. No soil disturbance activities due to rain. Expedited 10/10 results were below the trigger level. Please call me if you have any questions. Sincerely, SC Environmental, Inc. Chuck Siu, CIH, PE, CC Project Manager, CC cell: (510) csiu@sca-enviro.com ttachments: Table 1 Perimeter Zone Monitoring TEM Figure 1 Site Plan

4 Collection Date: Station # Sample ID Start-End Time Table 1 Perimeter Zone Monitoring irborne sbestos (s/cc) by TEM (CRB-modified HER) PG&E Former Hunters Point Power Plant - Site Management ctivities Duration (Min) Volume (liter) TEM (s/cc) Wind Direction (Compass) & Speed 9/26/11 Mon MS1 MS T 09:10 16: < W, NW 2 MPH 9/26/11 Mon MS2 MS T 07:00 16: N, NW 2 MPH 9/26/11 Mon MS3 MS T 07:00 15: < NW 2 MPH 9/26/11 Mon MS4 MS T 07:00 15: N, NW 4 MPH 9/26/11 Mon MS6U MS6U-0926-T 07:00 15: NW 2 MPH 9/26/11 Mon MS6D MS6D-0926-T 07:04 14: NW 2 MPH 9/26/11 Mon MS8U MS8U-0926-T 07:19 15: E, SE 2 MPH 9/26/11 Mon MS8D MS8D-0926-T 07:18 15: E, SE 2 MPH 9/27/11 Tue MS1 MS T 07:39 15: NW 2 MPH 9/27/11 Tue MS2 MS T 07:00 16: N, NW 2 MPH 9/27/11 Tue MS3 MS T 07:00 16: N, NW 2 MPH 9/27/11 Tue MS4 MS T 07:00 16: < N, NW 3 MPH 9/27/11 Tue MS6U MS6U-0927-T 06:51 15: NW 1 MPH 9/27/11 Tue MS6D MS6D-0927-T 06:51 15: NW 1 MPH 9/27/11 Tue MS8U MS8U-0927-T 07:08 15: E, SE 2 MPH 9/27/11 Tue MS8D MS8D-0927-T 07:06 15: < E, SE 2 MPH 9/28/11 Wed MS1 MS T 07:44 15: < E 1 MPH 9/28/11 Wed MS2 MS T 07:00 15: E, SE 1 MPH 9/28/11 Wed MS3 MS T 07:00 15: E, SE 1 MPH 9/28/11 Wed MS4 MS T 07:00 15: < E, SE 1 MPH 9/28/11 Wed MS6U MS6U-0928-T 06:54 15: < E 1 MPH 9/28/11 Wed MS6D MS6D-0928-T 06:55 15: < E 1 MPH 9/28/11 Wed MS8U MS8U-0928-T 07:11 15: NW 1 MPH 9/28/11 Wed MS8D MS8D-0928-T 07:09 15: < NW 1 MPH Page 1 of 4 For: 9/26-10/7/2011

5 Collection Date: Station # Sample ID Start-End Time Table 1 Perimeter Zone Monitoring irborne sbestos (s/cc) by TEM (CRB-modified HER) PG&E Former Hunters Point Power Plant - Site Management ctivities Duration (Min) Volume (liter) TEM (s/cc) Wind Direction (Compass) & Speed 9/29/11 Thu MS1 MS T 07:54 16: NW 4 MPH 9/29/11 Thu MS2 MS T 07:00 15: N, NW 4 MPH 9/29/11 Thu MS3 MS T 07:00 15: N, NW 4 MPH 9/29/11 Thu MS4 MS T 07:00 15: N, NW 7 MPH 9/29/11 Thu MS6U MS6U-0929-T 06:50 16: NW 3 MPH 9/29/11 Thu MS6D MS6D-0929-T 06:51 16: NW 3 MPH 9/29/11 Thu MS8U MS8U-0929-T 07:34 15: N 3 MPH 9/29/11 Thu MS8D MS8D-0929-T 07:32 15: < N 3 MPH 9/30/11 Fri MS1 MS T 07:54 15: < W 4 MPH 9/30/11 Fri MS2 MS T 07:00 15: N, NW 2 MPH 9/30/11 Fri MS3 MS T 07:00 15: N, NW 3 MPH 9/30/11 Fri MS4 MS T 07:00 15: W, SW 5 MPH 9/30/11 Fri MS6U MS6U-0930-T 06:54 15: NW 2 MPH 9/30/11 Fri MS6D MS6D-0930-T 06:54 15: NW 2 MPH 9/30/11 Fri MS8U MS8U-0930-T 07:12 15: SW 3 MPH 9/30/11 Fri MS8D MS8D-0930-T 07:10 15: SW 3 MPH 10/03/11 Mon MS1 MS T 08:15 15: SW 2 MPH 10/03/11 Mon MS2 MS T 07:00 16: W, SW 1 MPH 10/03/11 Mon MS3 MS T 07:00 15: S, SW 1 MPH 10/03/11 Mon MS4 MS T 07:00 16: W, SW 3 MPH 10/03/11 Mon MS6U MS6U-1003-T 06:57 15: S 2 MPH 10/03/11 Mon MS6D MS6D-1003-T 07:00 15: S 2 MPH 10/03/11 Mon MS8U MS8U-1003-T 07:11 15: S, SW 2 MPH 10/03/11 Mon MS8D MS8D-1003-T 07:10 15: S, SW 2 MPH Page 2 of 4 For: 9/26-10/7/2011

6 Collection Date: Station # Sample ID Start-End Time Table 1 Perimeter Zone Monitoring irborne sbestos (s/cc) by TEM (CRB-modified HER) PG&E Former Hunters Point Power Plant - Site Management ctivities Duration (Min) Volume (liter) TEM (s/cc) Wind Direction (Compass) & Speed 10/04/11 Tue MS1 MS T 07:25 16: W, NW 3 MPH 10/04/11 Tue MS2 MS T 07:00 16: N, NW 2 MPH 10/04/11 Tue MS3 MS T 07:00 16: < NW 2 MPH 10/04/11 Tue MS4 MS T 07:00 16:16\ < NW 5 MPH 10/04/11 Tue MS6U MS6U-1004-T 06:48 15: W, NW 2 MPH 10/04/11 Tue MS6D MS6D-1004-T 06:50 15: W, NW 2 MPH 10/04/11 Tue MS8U MS8U-1004-T 07:04 15: < W 2 MPH 10/04/11 Tue MS8D MS8D-1004-T 07:02 15: < W 2 MPH 10/05/11 Wed MS1 MS T 07:45 15: < W, NW 4 MPH 10/05/11 Wed MS2 MS T 07:00 15: N, NW 4 MPH 10/05/11 Wed MS3 MS T 07:00 15: < N, NW 3 MPH 10/05/11 Wed MS4 MS T 07:00 15: < N, NW 7 MPH 10/05/11 Wed MS6U MS6U-1005-T 06:52 15: W, NW 4 MPH 10/05/11 Wed MS6D MS6D-1005-T 07:05 15: W, NW 4 MPH 10/06/11 Thu MS1 MS T 08:19 15: < W, NW 3 MPH 10/06/11 Thu MS2 MS T 07:00 15: N, NW 2 MPH 10/06/11 Thu MS3 MS T 07:00 14: < N, NW 2 MPH 10/06/11 Thu MS4 MS T 07:00 14: NW 3 MPH 10/06/11 Thu MS6U MS6U-1006-T 06:47 15: W, NW 2 MPH 10/06/11 Thu MS6D MS6D-1006-T 06:51 15: W, NW 2 MPH 10/07/11 Fri MS1 MS T 08:06 15: S, SE 3 MPH 10/07/11 Fri MS2 MS T 07:00 15: SE 2 MPH 10/07/11 Fri MS3 MS T 07:00 15: S, SE 2 MPH 10/07/11 Fri MS4 MS T 07:00 15: < SE 5 MPH 10/07/11 Fri MS6U MS6U-1007-T 06:55 15: S, SE 2 MPH 10/07/11 Fri MS6D MS6D-1007-T 06:49 14: S, SE 2 MPH Page 3 of 4 For: 9/26-10/7/2011

7 PG&E Former Hunters Point Power Plant - Site Management ctivities Collection Date: Station # Sample ID Start-End Time Duration (Min) Volume (liter) TEM (s/cc) Wind Direction (Compass) & Speed Notes: (1) Sampling flow rates are below 10 liters per minute, per sampling method. (2) Lab analysis performed by sbestos TEM Laboratory, Berkeley, C. (NVLP ccreditation #: ) (3) Samples collected on 25-mm, 0.45-micrometer Mixed Cellulose Ester Filters in conductive cassettes. (4) < result = below detection limit for the sample. (5) s/cc = structures/cubic centimeter; Min = minutes; MS = ir Monitoring Station (6) BQMD has been notified of results exceeding s/cc, and additional dust mitigation measures have been implemented. Table 1 Perimeter Zone Monitoring irborne sbestos (s/cc) by TEM (CRB-modified HER) Page 4 of 4 For: 9/26-10/7/2011

Prepared for: Prepared by: 4005 Port Chicago Highway Concord, California

Prepared for: Prepared by: 4005 Port Chicago Highway Concord, California AIR MONITORING SUMMARY REPORT Time-Critical Removal Action for the Experimental Ship Shielding Range, Parcel E-2 Hunters Point Naval Shipyard San Francisco, California Contract Number N62473-10-D-0807