3. Project Monitoring The DRPA is requiring that project activities beindependently monitored to assure that allenvironmental procedures are strictly followedthroughout the course of this project.

Personal Sampling Pumps and CassettesThis type of monitoring is used to identify zoneswithin the immediate work site where workers mightbe exposed. The filters attached to the pumps areanalyzed in a laboratory for lead.

High Volume Ambient Air Monitors Air monitors will be used to assure that emissionsfrom the project in locations where the public will bepresent (e.g., around housing, churches, historicproperties, etc.) do not exceed the criteriaestablished by the Clean Air Act. A new filter isplaced in each monitor each day.

Noise MonitoringNoise monitoring will be conducted to assurecompliance with Gloucester City, New Jersey noiseordinances.

Visual Assessments In addition to conducting the instrument monitoring,trained personnel will observe all work activities forthe presence of unacceptable visible emissions orspills. The purpose is to facilitate timely correctionof leaks and clean up of material spills. A scheduleof visual assessments will be rigorously followed.

Delaware River Port Authority

Paint RemovalContainment and Monitoring Systems

Walt Whitman Bridge D E - L E A D I N G A N D PA I N T I N G P R O J E C T

N E W J E R S E Y D E C K T R U S S S P A N S

Walt Whitman Bridge DE-LEADING AND PAINTING PROJECTN E W J E R S E Y D E C K T R U S S S P A N S

Introduction

The Walt Whitman Bridge De-leading and Painting Project will involve the

complete removal of the existing paint coatings and rust. Because the

existing coatings contain lead, the DRPA is taking measures to assure that

the work will not cause harm to the public, to the environment, or to the

workers. Also, in order for the replacement coating to provide decades

of corrosion protect ion, i t is essent ia l that a high quality of surface

preparation be achieved. The paint removal and monitoring methods

described in this brochure were proven to be effective over the past several

years of Delaware River Port Authority bridge painting projects.

FOR MORE INFORMATION:

(856) 968-2255(215) 218-3750 ext. 2255 (800) 818-8938www.drpa.org

workers with comfortable, convenient access to the steel. This improves thequality of both the paint removal and inspection operations.

In the case of vacuum shrouded power tool cleaning, the equipment is fitted withits own containment cover. The need for additional containment materials in thework area is limited, and in some cases may not be necessary at all.

Paint chips and other wastes generated during the cleaning process will be stored,handled and disposed of in strict accordance with federal, state, and localregulations.

2. Negative Pressure Rather than rely solely on the quality of the containment box to control the dustand debris created by abrasive blast cleaning, the DRPA is requiring that thecontainments on the project be equipped with air filtration systems. While blastcleaning is underway, air and dust will be constantly sucked from the containmentthrough ductwork to a filtration system, also known as a dust collector.

The amount of air being pulled by the dust collector is designed to place thecontainment under negative pressure. This means that if the containment tears ora seam pulls apart, outside air will be drawn into the containment through theopening (because of the strength of the vacuum created by the dust collector),rather than allowing the air inside of the containment to escape.

Dry abrasive blast cleaning with expendableabrasives In this method, particles of abrasive(similar to sand) are propelled against the surfaceusing a concentrated stream of compressed air.The abrasives dislodge all paint and rust,providing the necessary level of cleaning for thelong-term performance of the replacementcoating system. This method also has the benefitof thoroughly cleaning out crevices and otherhard-to-reach areas. When using this method, acomplete containment/ventilation system isconstructed around the work area to controlemissions of dust and debris.

Dry abrasive blast cleaning with reusable abrasives. This method is similar to themethod above, except that the abrasive particles are manufactured from steel or iron.This allows the abrasive material to be collected and reused over and over again,significantly reducing the volume of waste that is created during the project. Equipmentis used to clean the abrasive and return it to the pots after each use.

On very rare occasions, a vacuum shrouded power tool may be used. In thismethod, a power tool is surrounded with its own shroud that is equipped with a vacuum.This creates a miniature containment around the tool that collects the waste as it isgenerated, and automatically transports it away from the work area through hoses.

Three Lines of Defense

1. Containment Dust and paint chips that are created during the removal of the paint are firstcontrolled through the use of a containment system. The containment systemeither surrounds the entire work area or surrounds the paint removal tool.

To build the containment system, a large "box" is built around the work area.When work is complete on that area the containment box will be disassembledand moved to the next work area.

The containment box is surrounded by impermeable tarpaulin materials that aredesigned to prevent dust and debris from seeping through.

The workers conduct the paint removal activities inside of the containment,completely isolated from the outside environment. The containment box, whileprotecting the public and the environment from emissions, also provides the

Methods of Paint Removal