SC Environmental, Inc. October 11, 2011 Via Email (dehn@pge.com) Mr. David Harnish PG&E 3401 Crow Canyon Rd. San Ramon, C 94109 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 0.016 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 0.0317 3 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.
9/30 MS6U / MS6D / 10/4 MS6U / 10/7 MS6D / 0.0364 0.0217 2 MPH / NW 2 MPH / NW 0.0831 2 MPH / W, NW 0.0202 2 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 02-0098 cell: (510) 333-0572 email: csiu@sca-enviro.com ttachments: Table 1 Perimeter Zone Monitoring TEM Figure 1 Site Plan
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 MS1-0926-T 09:10 16:06 416 2995 <0.0014 W, NW 2 MPH 9/26/11 Mon MS2 MS2-0926-T 07:00 16:12 552 3974 0.0031 N, NW 2 MPH 9/26/11 Mon MS3 MS3-0926-T 07:00 15:50 530 2816 <0.0011 NW 2 MPH 9/26/11 Mon MS4 MS4-0926-T 07:00 15:57 537 3866 0.0021 N, NW 4 MPH 9/26/11 Mon MS6U MS6U-0926-T 07:00 15:02 482 3816 0.0067 NW 2 MPH 9/26/11 Mon MS6D MS6D-0926-T 07:04 14:57 473 2365 0.0017 NW 2 MPH 9/26/11 Mon MS8U MS8U-0926-T 07:19 15:22 483 2415 0.0034 E, SE 2 MPH 9/26/11 Mon MS8D MS8D-0926-T 07:18 15:27 489 2445 0.0017 E, SE 2 MPH 9/27/11 Tue MS1 MS1-0927-T 07:39 15:58 499 3593 0.0023 NW 2 MPH 9/27/11 Tue MS2 MS2-0927-T 07:00 16:17 557 4010 0.0010 N, NW 2 MPH 9/27/11 Tue MS3 MS3-0927-T 07:00 16:05 545 3924 0.0010 N, NW 2 MPH 9/27/11 Tue MS4 MS4-0927-T 07:00 16:10 550 3960 <0.0010 N, NW 3 MPH 9/27/11 Tue MS6U MS6U-0927-T 06:51 15:07 496 2480 0.0016 NW 1 MPH 9/27/11 Tue MS6D MS6D-0927-T 06:51 15:02 491 2455 0.0017 NW 1 MPH 9/27/11 Tue MS8U MS8U-0927-T 07:08 15:24 496 2480 0.0016 E, SE 2 MPH 9/27/11 Tue MS8D MS8D-0927-T 07:06 15:26 500 2500 <0.0016 E, SE 2 MPH 9/28/11 Wed MS1 MS1-0928-T 07:44 15:51 487 3506 <0.0012 E 1 MPH 9/28/11 Wed MS2 MS2-0928-T 07:00 15:56 536 3859 0.0158 E, SE 1 MPH 9/28/11 Wed MS3 MS3-0928-T 07:00 15:40 520 3744 0.0032 E, SE 1 MPH 9/28/11 Wed MS4 MS4-0928-T 07:00 15:46 526 3787 <0.0011 E, SE 1 MPH 9/28/11 Wed MS6U MS6U-0928-T 06:54 15:09 495 2475 <0.0016 E 1 MPH 9/28/11 Wed MS6D MS6D-0928-T 06:55 15:04 489 2445 <0.0017 E 1 MPH 9/28/11 Wed MS8U MS8U-0928-T 07:11 15:24 493 2465 0.0082 NW 1 MPH 9/28/11 Wed MS8D MS8D-0928-T 07:09 15:27 498 2490 <0.0016 NW 1 MPH Page 1 of 4 For: 9/26-10/7/2011
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 MS1-0929-T 07:54 16:17 503 3622 0.0022 NW 4 MPH 9/29/11 Thu MS2 MS2-0929-T 07:00 15:48 528 3802 0.0032 N, NW 4 MPH 9/29/11 Thu MS3 MS3-0929-T 07:00 15:58 538 3874 0.0105 N, NW 4 MPH 9/29/11 Thu MS4 MS4-0929-T 07:00 15:07 547 3938 0.0062 N, NW 7 MPH 9/29/11 Thu MS6U MS6U-0929-T 06:50 16:38 588 2940 0.0317 NW 3 MPH 9/29/11 Thu MS6D MS6D-0929-T 06:51 16:32 581 2905 0.0042 NW 3 MPH 9/29/11 Thu MS8U MS8U-0929-T 07:34 15:10 456 2280 0.0053 N 3 MPH 9/29/11 Thu MS8D MS8D-0929-T 07:32 15:14 462 2310 <0.0018 N 3 MPH 9/30/11 Fri MS1 MS1-0930-T 07:54 15:29 455 3276 <0.0012 W 4 MPH 9/30/11 Fri MS2 MS2-0930-T 07:00 15:35 515 3708 0.0066 N, NW 2 MPH 9/30/11 Fri MS3 MS3-0930-T 07:00 15:16 496 3571 0.0011 N, NW 3 MPH 9/30/11 Fri MS4 MS4-0930-T 07:00 15:22 502 3614 0.0101 W, SW 5 MPH 9/30/11 Fri MS6U MS6U-0930-T 06:54 15:04 490 2450 0.0364 NW 2 MPH 9/30/11 Fri MS6D MS6D-0930-T 06:54 15:00 486 2430 0.0217 NW 2 MPH 9/30/11 Fri MS8U MS8U-0930-T 07:12 15:17 485 2425 0.0033 SW 3 MPH 9/30/11 Fri MS8D MS8D-0930-T 07:10 15:20 490 2450 0.0017 SW 3 MPH 10/03/11 Mon MS1 MS1-1003-T 08:15 15:50 455 3276 0.0012 SW 2 MPH 10/03/11 Mon MS2 MS2-1003-T 07:00 16:09 549 3953 0.0021 W, SW 1 MPH 10/03/11 Mon MS3 MS3-1003-T 07:00 15:56 536 3859 0.0032 S, SW 1 MPH 10/03/11 Mon MS4 MS4-1003-T 07:00 16:01 541 3895 0.0031 W, SW 3 MPH 10/03/11 Mon MS6U MS6U-1003-T 06:57 15:16 499 2495 0.0016 S 2 MPH 10/03/11 Mon MS6D MS6D-1003-T 07:00 15:13 493 2465 0.0049 S 2 MPH 10/03/11 Mon MS8U MS8U-1003-T 07:11 15:29 498 2490 0.0049 S, SW 2 MPH 10/03/11 Mon MS8D MS8D-1003-T 07:10 15:31 501 2505 0.0016 S, SW 2 MPH Page 2 of 4 For: 9/26-10/7/2011
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 MS1-1004-T 07:25 16:06 521 3751 0.0011 W, NW 3 MPH 10/04/11 Tue MS2 MS2-1004-T 07:00 16:25 565 4068 0.0159 N, NW 2 MPH 10/04/11 Tue MS3 MS3-1004-T 07:00 16:12 552 3974 <0.0010 NW 2 MPH 10/04/11 Tue MS4 MS4-1004-T 07:00 16:16\ 556 4003 <0.0010 NW 5 MPH 10/04/11 Tue MS6U MS6U-1004-T 06:48 15:39 531 2655 0.0831 W, NW 2 MPH 10/04/11 Tue MS6D MS6D-1004-T 06:50 15:36 526 2630 0.0031 W, NW 2 MPH 10/04/11 Tue MS8U MS8U-1004-T 07:04 15:06 482 2410 <0.0017 W 2 MPH 10/04/11 Tue MS8D MS8D-1004-T 07:02 15:10 488 2440 <0.0017 W 2 MPH 10/05/11 Wed MS1 MS1-1005-T 07:45 15:27 462 3326 <0.0012 W, NW 4 MPH 10/05/11 Wed MS2 MS2-1005-T 07:00 15:51 531 3823 0.0011 N, NW 4 MPH 10/05/11 Wed MS3 MS3-1005-T 07:00 15:35 515 3708 <0.0011 N, NW 3 MPH 10/05/11 Wed MS4 MS4-1005-T 07:00 15:42 522 3758 <0.0011 N, NW 7 MPH 10/05/11 Wed MS6U MS6U-1005-T 06:52 15:11 499 2495 0.0016 W, NW 4 MPH 10/05/11 Wed MS6D MS6D-1005-T 07:05 15:05 480 2400 0.0084 W, NW 4 MPH 10/06/11 Thu MS1 MS1-1006-T 08:19 15:03 404 2909 <0.0014 W, NW 3 MPH 10/06/11 Thu MS2 MS2-1006-T 07:00 15:21 501 3607 0.0045 N, NW 2 MPH 10/06/11 Thu MS3 MS3-1006-T 07:00 14:48 468 3370 <0.0012 N, NW 2 MPH 10/06/11 Thu MS4 MS4-1006-T 07:00 14:07 527 3074 0.0026 NW 3 MPH 10/06/11 Thu MS6U MS6U-1006-T 06:47 15:51 544 2720 0.0149 W, NW 2 MPH 10/06/11 Thu MS6D MS6D-1006-T 06:51 15:36 525 2625 0.0093 W, NW 2 MPH 10/07/11 Fri MS1 MS1-1007-T 08:06 15:25 439 3161 0.0013 S, SE 3 MPH 10/07/11 Fri MS2 MS2-1007-T 07:00 15:49 529 3809 0.0011 SE 2 MPH 10/07/11 Fri MS3 MS3-1007-T 07:00 15:35 515 3708 0.0011 S, SE 2 MPH 10/07/11 Fri MS4 MS4-1007-T 07:00 15:49 520 3744 <0.0011 SE 5 MPH 10/07/11 Fri MS6U MS6U-1007-T 06:55 15:01 486 2430 0.0017 S, SE 2 MPH 10/07/11 Fri MS6D MS6D-1007-T 06:49 14:51 482 2410 0.0202 S, SE 2 MPH Page 3 of 4 For: 9/26-10/7/2011
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 #: 101891-0) (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 0.016 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