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Asbestos Identification and Abatement
Published in Benjamin Alter, Environmental Consulting Fundamentals, 2019
There are four types of asbestos abatement: removal, enclosure, encapsulation, and operations and maintenance. Since the most technically involved method of abatement is removal, the rest of this chapter offers far more coverage on asbestos removal than the other three asbestos abatement methods.
The effect of prevailing wages on building costs, bid competition, and bidder behaviour: evidence from Ohio school construction
Published in Construction Management and Economics, 2020
Lameck Onsarigo, Kevin Duncan, Alan Atalah
Since states could carry forward federal Qualified School Construction Bond Programme funds, projects covered by prevailing wage standards extend to at least 2016. Detailed project specifics available from Dodge Data & Analytics were used to identify those OFCC school construction projects that were covered by the Davis-Bacon Act. With this information, we were able to determine the prevailing wage status and obtain other complete information for 113 of the 132 OFCC school projects. The OFCC reports data on the low bid, identity, address, and number of participating contractors, school type (elementary, middle, etc.), and project type (new, renovation, and asbestos abatement, etc.), as well as the engineer/agency estimate of project cost. All projects in this analysis (irrespective of the prevailing wage requirement) were procured through open competitive bidding (open tendering). The complete record of all competing contractors allowed the researchers to examine the effect of PWLs on the low, winning bid as well as on all submitted bids. Specifically, the data allow for the examination of the effect of the policy on the low bids of 113 projects. Since there were approximately 5.9 bidders per project, we are also able to measure the effect of the policy on all 669 submitted bids. The information regarding the number of participating contractors also allowed us to determine if the level of bid competition differs for projects that were covered by the prevailing wage policy and those that were not.
Capture efficiency of portable high-efficiency air filtration devices used during building construction activities
Published in Journal of Occupational and Environmental Hygiene, 2018
Derek A. Newcomer, Peter LaPuma, Robert Brandys, Amanda Northcross
Most of the PHEAF devices selected for study were typical of the type used in the asbestos abatement and similar industries. Two PHEAF devices included in the study were constructed with high-density, polyethylene cabinets. The PHEAF devices evaluated in this study were deployed to control PM during interior renovation of a building. The scope of work entailed demolition and replacement of typical building materials (concrete, gypsum wallboard, vinyl floor tile). The PHEAF units were staggered throughout twelve building levels with the number of units per floor determined by project need. The units were configured to discharge the filtered air through a polyester duct outside of the building. The metal fabricated PHEAF units were of similar sizes, although there were different manufacturers. Most units had a 37.75″ × 26.5″ floor dimension and 31.25″ cabinet height that housed a HEPA filter and a forward curved blade fan rated at 1,975 cubic feet per minute (cfm). The 2 PHEAF devices constructed of high-density, polyethylene cabinet operated with a maximum airflow range of 500 cfm and 900 cfm, respectively. Each device had a coarse particulate pre-filter inserted in front of the HEPA filter.
Releasability of asbestos fibers from weathered roof cement
Published in Journal of Occupational and Environmental Hygiene, 2018
Andrew F. Oberta, Lee Poye, Steven P. Compton
The study described in this article differs from the Mowat and Sheehan studies in the type of TEM analysis used. The NIOSH 7402 method used in the latter studies counts PCM-equivalent (PCMe) asbestos fibers longer than 5 µm and wider than 0.25 µm, whereas the TEM protocol in the ASTM D5755 method used for this study counts asbestos fibers greater than 0.5 µm long with no minimum width restriction. These fiber-counting rules are the same as those in the TEM analytical protocol in the AHERA rules for clearance samples for asbestos abatement projects in schools.[18] The AHERA approach is more logical to use for roof cement, a product known to contain primarily short asbestos fibers.