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Soilworks products are the industry’s top standard due to our insistence on creating high performance soil stabilization and dust control products that stand up to rigorous testing – both in the lab and in the field. Our commitment to quality and performance has led to our involvement and testing in hundreds of real-world situations. The following library of reports, presentations, specifications, approvals and other similar documents provide you, our customer, the transparency and dependable assurance that is expected from Soilworks.

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

Summary

During the Hunters Point Power Plant cleanup in San Francisco, dust control measures were rigorously monitored to mitigate exposure to airborne naturally occurring asbestos (NOA). When particulate readings exceeded the site’s trigger threshold, corrective actions were implemented, including increased water application and suspension of work activities. To enhance surface control and prevent re-entrainment of hazardous particles, Soiltac—a synthetic copolymer emulsion from Soilworks—was applied at the end of daily shifts to seal graded and excavated areas.

Soiltac’s use helped create a stabilized crust on disturbed soil, reducing windblown asbestos risks in compliance-sensitive urban remediation projects. The document highlights the importance of adapting dust control strategies based on real-time air monitoring data, wind conditions, and proximity to non-project disturbances. For environmental professionals managing contaminated site cleanups in populated or high-risk zones, Soilworks offers reliable solutions to maintain regulatory compliance and protect surrounding communities. Contact Soilworks for consultation on tailored surface-stabilization strategies for hazardous waste remediation.

HUNTERS POINT POWER PLANT CLEANUP PROJECT

Naturally-Occurring Asbestos Air Monitoring Results October 21 through November 2, 2011

Running Total of Work Days during the Hunters Point Power Plant Project Cleanup Phase: 436 Running Total of Work Days with Results At or Above the Trigger Level: 56

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

Glossary & Notes

  • Trigger level –0.016 structures per cubic centimeter (s/cc). When results above the trigger level necessitate adaptation of on-site dust control measures, work is only resumed in an area once air monitoring results for a full work day demonstrate conditions in the area are back under the trigger level.
  • Air monitoring now takes place on a 24-hour basis. Results are taken beginning at 5 p.m. on the day prior to the day indicated on the chart. For example, data for Friday is measured from 5 p.m. on Thursday to 5 p.m. on Friday.
  • Site maintenance activities such as daily dust mitigation activities, air monitoring activities and storm water management are not listed in the table. Wind direction is relative to plant north (parallel to Evans Ave).
  • On Wednesday, November 2, sampling time for one monitor (AMS4) is “from ~5 pm 11/1 to 3:30 pm 11/2” due to a disruption of power.

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PG&E Hunters Point Power Plant Cleanup Project (downloadable PDF)

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