Lead Paint Removal >> Lead Paint Exposure To Workers In California

Occupational Safety and Health Administration (OSHA) Welding Safety Orders for hot work on painted steel structures require that lead-based paint be stripped back "a sufficient distance from the area to be heated to ensure that the temperature of the unstripped metal will not be appreciably raised." 
For enclosed spaces, this distance must be at least four inches from the weld or cut line, or Lead Paint Exposure To Workers In California workers must wear supplied-air respirators. 

(1) The somewhat stricter Cal/OSHA Construction Safety Order requires that all surfaces covered with toxic preservatives be stripped at least four inches from the weld or cut line (no mention of enclosed spaces), or Lead Paint Exposure To Workers In California workers must wear supplied- air respirators. The (2) The California Department of Health Services (DHS) Occupational Lead Poisoning Prevention Program received anecdotal evidence that iron workers performing hot work on previously stripped steel may encounter high airborne lead levels. These exposures may be caused by a failure to meet the four-inch- minimum OSHA requirement, Lead Paint Exposure To Workers In California or by hot work so intense that excessive lead fumes are created even when the paint is stripped back. 

The lead source may be residual paint on the surface or possibly lead in the base steel. To investigate this issue, DHS industrial hygienists conducted air sampling of an iron worker's exposure to lead fumes during two days of hot cutting 3/4-inch steel for a major seismic retrofit job on a bridge. The general contractor had Lead Paint Exposure To Workers In California purportedly stripped the lead- based coating back four inches from both sides of the cut lines prior to cutting. 

Background Very few task-based exposure assessments of iron workers engaged in the hot cutting of painted steel exist. A 1988 Canadian study of a demolition project that included the oxy-acetylene torching of an old water purification system Lead Paint Exposure To Workers In California demonstrated that sandblasting a six- to eight-inch strip from the painted metal prior to cutting significantly reduced breathing zone air levels from a mean of 21,330 ¹g/M3 to mean values of 1300 ¹g/M3 and 1100 ¹g/M3 . 

(3) A recent task-based exposure assessment evaluated oxy-acetylene torch cutting on stripped steel associated with a bridge renovation project and Lead Paint Exposure To Workers In California with an elevator demolition project. The study explored the practical technical and management problems of completing paint removal prior to torch cutting.

(4) Methods In November 1998, Lead Paint Exposure To Workers In California DHS industrial hygienists conducted two consecutive days of task-based personal exposure monitoring of an iron worker cutting 3/4-inch steel on the western span of the San Francisco-Oakland Bay Bridge. The Bay Bridge was constructed in 1936, and the existing paint is known to contain high levels (approximately 20–40%) of lead.

(5) The work consisted of hot cutting 40 one-inch by 24-inch segments from existing painted 3/4-inch steel forms (Figure 1). These steel forms were being trimmed to accommodate installation of additional outer steel braces for Lead Paint Exposure To Workers In California earthquake retrofit. The iron worker used a Lincoln Arc Iron worker CIV-25 with carbon arc electrode rods (Copper clad Arcair) on the first day, and an oxygen/propane torch on the second day. 

Actual hot-cutting time consisted of 166 minutes on day one, and 154 minutes on day two. For the eight- hour time-weighted average (TWA) calculation, Lead Paint Exposure To Workers In California zero exposure was assumed for the remainder of each shift. The paint had been stripped back from the cut line by the general contractor previously using open sandblasting. 

A tape measure was used to record the actual distance that the paint had been stripped back from each of 12 cut lines, Lead Paint Exposure To Workers In California on both front and back surfaces. Direct readings of lead levels on both stripped and unstripped steel were taken using a Niton XL-309 X-ray fluorescence (XRF) analyzer. A bulk sample of the paint was collected and analyzed. 

Personal samples in the operator breathing zone inside the welding helmet were taken on both days. On day two, Lead Paint Exposure To Workers In California separate filter samples were collected for (1) exposure when cutting on stripped steel (91 minutes) and (2) exposure when making five corner cuts on steel that had not been stripped of paint (63 minutes). 

A laboratory accredited by the National Lead Laboratory Accreditation Program performed the analyses, using Environmental Protection Agency method #SW-846 for analysis of metal in paint chip samples, Lead Paint Exposure To Workers In California and NIOSH method #7300 for analysis of airborne lead particulates. Results Content of Lead and Other Metals in the Paint Laboratory analysis of the bulk paint chip showed 4.2 percent lead by weight in the bridge paint at this location. 

This result is much lower than the 20 to 40 per- cent levels of lead typically found in bulk samples taken on San Francisco Bay Area bridges of this era. Analysis for three other metals showed 1900 ppm (0.19%) chromium, <50 ppm arsenic, Lead Paint Exposure To Workers In California and <2 ppm cadmium. At the work site, XRF analyzer readings confirmed a positive reading for lead (mean of 52 mg/cm2 for 28 readings of unstripped areas). 

The depth indicator on the XRF demonstrated that the lead was concentrated in the deepest, Lead Paint Exposure To Workers In California bright- orange layers. The Niton XRF Spectraview L-shell spectrum was analyzed to determine whether other elements were presentin the paint. The model used gave qualitative, but not quantitative, results for metals other than lead.

The spectrum proved that iron and zinc were both present above the detectable limit (DL) of 500 ppm. Furthermore, it indicated that the following elements that are often found in paint were not present above the DL of 500 ppm: arsenic, chromium, manganese, and nickel; and mercury was not present above the DL of 100 ppm. 

However, the Niton XRF was unable to provide information about cadmium or beryllium, Lead Paint Exposure To Workers In California as these elements were not detectable due to interference by the XRF's cadmium source. Stripping XRF readings revealed no detectable levels of lead (detection level of 0.05 mg/ cm2 ) on the steel that had been stripped (mean of <0.07 § 0.02 mg/cm2 for 23 readings of stripped areas). These low readings indicate that the stripping method, open abrasive blasting, was effective in removing paint.

Flood Warning

What happens if a policy with subsidized rates is allowed to lapse or the property is sold? Answer: Starting this fall, for all currently subsidized policies, there will be an immediate increase to the full risk rates for all new and lapsed policies and Flood Damage Flood Warning upon the sale/purchase of a pro  read more..

Risk Assessment Of Asbestos Removal In Pennsylvani

This is a non-mandatory appendix to the asbestos standards for construction and for shipyards. It describes criteria and procedures for erecting and using negative pressure enclosures for Class I Asbestos Work, when NPEs are used as an allowable Asbestos Abatement Risk Assessment Of Asbestos Removal In Pennsylvani  control method to comply with paragrap  read more..

Compulsive Hoarding Trash Hauling

Compulsive hoarding, round four


Some people might think, is Hoarding Compulsive Hoarding Trash Hauling some form of entertainment? Maybe you have seen the so-called reality television show “Hoarding: Buried Alive,” now your answer may be “yes.” Watching these shows have been described as some kind of guilty pleas  read more..

Earthquakes

Recent earthquakes around the world show a pattern of steadily increasing damages and losses that are due primarily to two factors: (1) significant growth in earthquake-prone urban areas and (2) vulnerability of the older building stock, Flood Damage Earthquakes including buildings constructed within the past 20 yea  read more..

Types Of Security Fences

Although elevated, this house in North Carolina could not withstand the 15 ft (4.5 m) of storm surge that came with Hurricane Floyd (1999)Additionally, currents created by tides combine with the waves to severely erode beaches and coastal highways. Buildings that survive hurricane winds can be damag  read more..

Get Rid Of Flood Damage Smells In Basements

If You Are Asked To Evacuate Take essential disaster supplies with you. See "Disaster Supplies Kit" on this web site.Community activities Your neighborhood or community can take steps to reduce flood losses in the future. Recent flooding may prompt local governments to start a flood planning effort   read more..

The Best Ways To Move A Hoarder

The purpose of this Study Issue is to determine how Sunnyvale can effectively address interior hoarding conditions at residential properties. Staff conducted an extensive amount of research on-line and through a survey of the California Association of Code Enforcement Officers pertaining to how othe  read more..

Lead Poisoning Causes Health Problems

Current Cal/OSHA (California Division of Occupational Safety and Health) and Federal OSHA (Occupational Safety and Health Administration) regulations tie BLL testing requirements to air monitoring. Employers must do initial air monitoring and, if air lead concentrations are above 30 µg/m3 more th  read more..

Water Damage House Mold

Stages of Remediation Process The fungal remediation process consists of the following basic elements:1. Identifying and correcting the source of moisture and fungal contamination 2. Controlling the contaminated area to prevent spreading of fungi 3. Source removal of the fungi, contaminated dus  read more..

Remove Lead Paint From Your Business

Employers shall institute a medical surveillance program for all employees who are or may be exposed at or above the action level for more than 30 days per year. (B) The employer shall assure that all medical examinations and procedures are performed by or under the Lead Paint Removal Remove Lead Paint From Your Business supervision of a l  read more..