Robert Saur

Sr. Remediation Project Manager Environmental Remediation 3401 Crow Canyon Road San Ramon, CA 94583 (925) 415-6371 r4sw@pge.com

October 29, 2015 Mr. Kevin Vo and Mr. Paul Hibser Air Quality specialists Bay Area Air Quality Management District 929 Ellis Street San Francisco, CA 94109 Subject: Bi-weekly Asbestos (TEM) Monitoring Report for October 12, 2015 to October 23, 2015. Former Hunters Point Power Plant Site, 151 Jennings Street San Francisco, CA 94124 ADMP RIN # NOA0055 Dear Mr. Vo and Mr. Hibser: Please find attached the bi-weekly report of asbestos monitoring of the former Hunters Point Power Plant site. PG&E is currently working in Area J, and air monitoring for asbestos is implemented in accordance with the BAAQMD approved Asbestos Dust Mitigation Plan (ADMP). ERM performs air monitoring in accordance with the applicable requirements and prepared the attached report. Attached also is an excel spreadsheet with all the TEM data collected from July 2009 to October 23, 2015. Please contact me at 925-415-6371 if you have any questions. Sincerely,

Robert Saur, PG Sr. Remediation Project Manager Enclosure Cc: John Cavanaugh, ERM

29 October 2015

Mr. Rob Saur PG&E 3401 Crow Canyon Road San Ramon, CA 94583 Subject: Biweekly Asbestos (TEM) Monitoring Report for October 12th through October 23th Former Hunter’s Point Power Plant Site 1000 Evans Ave., San Francisco, CA 94124 ADMP RIN # NOA-0055 (Amendment#2)

Dear Mr. Saur:

In accordance with the Bay Area Air Quality Management District (BAAQMD)-approved Asbestos Dust Mitigation Plan (ADMP) amendment dated 2012 May 11, attached is a tabulation of the air monitoring results for airborne asbestos analyzed by Transmission Electron Microscopy (TEM). All air testing was performed in accordance with the approved ADMP. The attached figure shows the location of the Air Monitoring Stations (AMS).

Soil disturbance work was conducted from 12 October to 23 October 2015. During the reporting period, there were no TEM test reports for airborne asbestos that exceed 0.016 structures per cubic centimeter (s/cc), the trigger level established for this project. Site work is ongoing and estimated to be completed in January 2016.

The table below lists the activity and response action at the time of the excedance.

Environmental Resources Management 1277 Treat Boulevard Suite 500 Walnut Creek, CA 94597 (925) 946-0455 (925) 946-9968 (fax) www.erm.com

Mr. Rob Saur 29 October 2015 Page 2

Environmental Resources Management

Date Station ID/Area

Result (s/cc)

Average Wind Speed & Direction

Activity Onsite Response Action

No exceedances for this reporting period.

Please feel free to call me if you have any questions.

Sincerely,

Veronica Shannon Site Compliance Officer

Cell: 818-280-7501 email: veronica.shannon@erm.com enclosures Table 1: Area Monitoring – TEM Figure 1: Site Plan

Mr. Rob Saur 29 October 2015 Page 3

Environmental Resources Management

TABLE 1

Perimeter Zone Monitoring – Airborne Asbestos (s/cc) by TEM (CARB-modified AHERA) PG&E Former Hunters Point Power Plant - Site Management Activities

Collection Date: Station # Sample ID Start-End

Time Duration

(Min) Volume

(liter) Results (s/cc)

Wind Direction (Compass) &

Speed

10/12/15 Mon AMS-J-1 AMS-J-1-101215 15:15-15:35 1,460 4,374 < 0.0010

SSE, 2-4MPH 10/12/15 Mon AMS-J-2 AMS-J-2-101215 15:02-15:02 1,440 4,039 0.0019

10/12/15 Mon AMS-J-3 AMS-J-3-101215 15:25-15:30 1,445 3,651 0.002

10/13/15 Tue AMS-J-1 AMS-J-1-101315 15:05-15:42 1,475 3,587 0.0037

SE, 2MPH 10/13/15 Tue AMS-J-2 AMS-J-2-101315 8:42-16:30 468 1,198 0.0049

10/13/15 Tue AMS-J-3 AMS-J-3-101315 15:30-16:05 1,475 3,688 0.001

10/14/15 Wed AMS-J-1 AMS-J-1-101415 15:45-15:27 1,422 3,434 <0.0010

NW, 8MPH 10/14/15 Wed AMS-J-2 AMS-J-2-101415 16:30-15:15 1,365 3,092 <0.0010

10/14/15 Wed AMS-J-3 AMS-J-3-101415 16:05-15:47 1,422 3,271 <0.0010

10/15/15 Thu AMS-J-1 AMS-J-1-101515 15:30-15:00 1,410 4,047 <0.0010

SE, 2-8MPH 10/15/15 Thu AMS-J-2 AMS-J-2-101515 15:15-14:45 1,410 3,328 <0.0009

10/15/15 Thu AMS-J-3 AMS-J-3-101515 15:50-15:20 1,410 4,060 <0.0011

10/16/15 Fri AMS-J-1 AMS-J-1-101615 15:00-13:22 1,342 3,301 <0.0010

NW, 4MPH 10/16/15 Fri AMS-J-2 AMS-J-2-101615 14:45-13:10 1,345 4,667 <0.0009

10/16/15 Fri AMS-J-3 AMS-J-3-101615 15:20-13:35 1,335 4,539 <0.0010

10/19/15 Mon AMS-J-1 AMS-J-1-101915 15:35-15:10 1,395 4,437 0.0019

W, 15MPH

10/19/15 Mon AMS-J-2 AMS-J-2-101915 8:45-15:47 422 3,136 0.002

Mr. Rob Saur 29 October 2015 Page 4

Environmental Resources Management

TABLE 1

Perimeter Zone Monitoring – Airborne Asbestos (s/cc) by TEM (CARB-modified AHERA) PG&E Former Hunters Point Power Plant - Site Management Activities

Collection Date: Station # Sample ID Start-End

Time Duration

(Min) Volume

(liter) Results (s/cc)

Wind Direction (Compass) &

Speed

10/19/15 Mon AMS-J-3 AMS-J-3-101915 15:52-15:30 1,418 4,282 <0.0009

10/20/15 Tue AMS-J-1 AMS-J-1-102015 15:10-15:17 1,447 4,209 0.0009

S, 2MPH 10/20/15 Tue AMS-J-2 AMS-J-2-102015 15:50-15:05 1,395 3,976 0.001

10/20/15 Tue AMS-J-3 AMS-J-3-102015 15:30-15:36 1,446 4,692 <0.0009

10/21/15 Wed AMS-J-1 AMS-J-1-102115 15:17-15:20 1,443 5,224 <0.0009

NW, 3-5MPH 10/21/15 Wed AMS-J-2 AMS-J-2-102115 15:05-15:05 1,440 3,816 0.0019

10/21/15 Wed AMS-J-3 AMS-J-3-102115 15:36-15:38 1,442 4,066 0.001

10/22/15 Thu AMS-J-1 AMS-J-1-102215 7:53-15:00 427 1,789 <0.0010

SE, 0-1MPH 10/22/15 Thu AMS-J-2 AMS-J-2-102215 15:05-15:40 1,475 4,307 <0.0009

10/22/15 Thu AMS-J-3 AMS-J-3-102215 15:38-15:18 1,460 3,957 0.001

10/23/15 Fri AMS-J-1 AMS-J-1-102315 15:00-15:31 1,471 3,655 <0.0010

NE, 0-10MPH 10/23/15 Fri AMS-J-2 AMS-J-2-102315 15:41-15:08 1,407 4,559 <0.0009

10/23/15 Fri AMS-J-3 AMS-J-3-102315 15:18-15:38 1,460 3,679 0.001 NOTES: (1) Sampling flow rates are below 10 liters per minute, per sampling method. (2) Lab analysis performed by Asbestos TEM Laboratory, Berkeley, CA. (NVLAP Accreditation #: 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; AMS = Air Monitoring Station (6) BAAQMD has been notified of results exceeding 0.0162 s/cc, and additional dust mitigation measures have been

implemented. (7) NA = not available

WAREHOUSE

WHITE CAPPROPERTY

AREAAREA B

CENTRAL

AREA J

AREA C/DOPERATING SUBSTATION

AREA H

AMS-J-1

AREA I AREA BSOUTH

AREA A

AREA BNORTH

UNIT 4BASEMENT AREA

APPROXIMATEPREVAILING WIND

DIRECTION

AMS-J-2

AMS-J-3

0 100' 200' 400'

SCALE IN FEET

LEGEND

Remediation And Restoration In AreaComplete Or Inactive Area

Operating Substation Boundary

Active Remediation Area

Potential Mobile Air Monitoring Station

Indicates Example Range Of Mobile AirMonitoring Station Locations

© ERM

Figure 1