PG&E Hunters Point Power Plant Cleanup Project (TPD1111031)

Date

Work Area & Air Monitor Above Trigger

Results of All Air Monitors (s/cc)

Min & Max Wind Speed / Wind Direction

Activities in Area of Monitor(s) Above Trigger

Activities in Other Areas

Response Action

Thu. 10/27

Area B

AMS1= 0.0032

1-11 mph/ N, NW

• Area B-Removed equipment
• Area A- Installed drain and continued grading activities.
  • Area H- Continued to install fence
  • Non-PG&E activities in close proximity.
• Suspended work in Areas B and A, and evaluated work, weather and wind conditions. Upon reviewing the facts, we determined the elevated readings were likely associated with utility work being performed at a non-PG&E offsite project.

AMS2=

AMS2= 0.0176

2-11 mph/ N, NW

0.0176

AMS3= 0.0022

0-12 mph/ NW

AMS4= 0.0056

3-16 mph/ W, NW

Area A

AMS6U= 0.0493

1-11 mph/ NW

AMS6U=

AMS6D= 0.0077

0-11 mph/ NW

0.0493

Fri. 10/28

No Results Above the Trigger Level.

Sat 10/29

Area A

AMS1= 0.0021

0-4 mph/ E, NE

• Area A-Continued grading activities in small areas and removed asphalt
  • No soil disturbing activities
• Suspended work in Area A, and evaluated work, weather and wind conditions.
• Upon reviewing the facts, we adapted our dust control measures by requiring additional wetting of asphalt before all future asphalt-removal work.

AMS6U=

AMS2= 0.0043

0-6 mph/ N, NW

0.0162

AMS3= 0.0010

0-3mph/ SE

AMS4= 0.0042

1-9 mph/ NE

AMS6U= 0.0162

0-5 mph/ N, NW

AMS6D= 0.0021

0-5 mph/ N, NW

Mon. 10/31

Area A

AMS1= 0.0011

2-15 mph/ N, NW

• Area A-Grading
  • Area B- Continued to remove equipment.
  • Area H- Continued to install the fence.
  • Non-PG&E activities in close proximity.
• Suspended work in Area A, and evaluated work, weather and wind conditions.
• Upon reviewing the facts, we determined the elevated reading was likely associated with utility work performed being performed at a non-PG&E offsite project.

AMS6U=

AMS2= 0.0043

1-17 mph/ N, NW

activities.

0.0268

AMS3= 0.0044

2-17 mph/ N, NW

AMS4= 0.0011

0-17 mph/ NW

AMS6U= 0.0268

2-15 mph/ N, NW

AMS6D= 0.0068

2-15 mph/ N, NW

Tue. 11/1

Area C/D

AMS1= 0.0011

0-17 mph/ N, NW

• Area C/D- Excavation of vegetated buffer area, grading activities throughout site
• Area A – Placement of aggregate base, grading activities
  • Area B- Continued to remove equipment.
  • Area H- Continued to install the fence
  • Non-PG&E activities in close proximity.
• Suspended work in Area C/D, and evaluated work, weather and wind conditions. Upon reviewing the facts, we adapted our dust control measures by requiring (1) additional application of water during work days to keep all work area surfaces moist and

(2) application of soiltac at the end of each shift.

• Suspended work in Area A, and evaluated work, weather and wind conditions. Upon reviewing the facts, we adapted our dust control measures by requiring (1) additional mist guns to be employed to ensure coverage and (2) elevation of mist guns as necessary to ensure mist coverage within work zone.

AMS4=

AMS2= 0.0075

0-11 mph/ N, NW

0.0161

AMS3= 0.0011

0-12 mph/ NE

AMS4= 0.00161

0-11 mph/ NW

Area A

AMS6U= 0.0043

0-15 mph/ N, NW

AMS6D=

AMS6D= 0.5422

0-15 mph/ N, NW

0.5422

Wed. 11/2

No Results Above the Trigger Level