Page 59 - Highway Engineering Handbook Building and Rehabilitating the Infrastructure

42 CHAPTER ONE

TABLE 1.13 Example Calculation of Surface Area Required to Generate a Unit Weight of Lead

Assumptions:
Lead in paint 1% (10,000 ppm)
Dry film thickness (DFT) 10 mil (0.010 in)
3
Density of dried paint 1.5 g/cm (can range from 1.1 to 2.5)
Calculations:
2
2
2
1. Calculate volume of paint in 1 ft (1 ft 929 cm ):
2
Volume 929 cm (DFT 2.54 cm/in)
2
929 cm (0.010 in 2.54 cm/in)
23.60 cm 3
2
2. Calculate weight of paint in 1 ft :
Paint weight density volume
3
1.5 g/cm 23.60 cm 3
35.4 g
2
3. Calculate weight of lead in 1 ft of paint (1 ppm 1 g/g):
Lead weight ppm lead paint wt/ft 2
10,000 g/g 35.4 g/ft 2
354,000 g/ft 2
4. Calculate square feet required to generate 1 lb of lead (1 lb 454 g 1,000,000 g/g
454,000,000 g/g):
Area 1 lb ÷ wt of lead/ft 2
454,000,000 g ÷ 354,000 g/ft 2
1282 ft 2
Source: Adapted from K. A. Trimbler, Industrial Lead Paint Removal Handbook, 2d ed., Steel Structures
Painting Council/KTA-Tator, Inc., Pittsburgh, 1993.
TABLE 1.14 Regulations for Worker Protection during Paint Removal
RCRA regulation Description
29 CFR 1926 Safety of health regulations for construction
29 CFR 1926.33 Access to employee exposure and medical records
29 CFR 1926.51 Sanitation
29 CFR 1926.59 Hazard communication
29 CFR 1926.62 Lead
29 CFR 1926.63 Cadmium
29 CFR 1926.103 Respiratory protection

1.5.3 Approaches to the Management of
Lead-Based Paint on Steel Bridges
A number of methods have been advanced to effectively contain blasting debris and to min-
imize the amount of waste generated from the management of lead-based paint from steel
bridges. These methods are discussed in Art. 1.5.5 of this chapter. They can be broadly
characterized as follows.

Deferring Maintenance. This approach does not serve to protect the bridge, and is the
least satisfactory approach to protecting the large public investment represented by a major
steel bridge.