2012-054 RES AWARDING CONTRACT FOR REHABILITATION OF EAST ELEVATED STORAGE TANK TO CLASSIC PROTECTIVE COATINGS INC

Home Browse Search

SSPC-Guide 6 October 1, 2004 • Level 4 Emissions - Emissions are unrestricted and may occur at any time. NOTE: The workday activities for timing emissions en- compass surface preparation and clean-up only. 5.5.1.2 Opacity Scale: Opacity measurements are made by trained, certified observers. A scale from 0% to 100%, in 5% increments, is used. Measurements are typically made at 15 second intervals for given periods of time (e.g., 30 minutes). The acceptance criteria must be established by the specifier. For example, a criteria might restrict the opacity to no more than 20°/a for any three minute period in 60 minutes. Local regulations may provide guidance as to the level of opacity that should be required. 5.5.2 Method B-AmbientAir Monitoring forPM-10: High volume air samplers equipped with PM-10 heads are used to assess the total amount of particulate matter 10 micrometers (0.39 mils) or less in size that escape the contained work area. The number of monitors to be used is based on wind direction and proximity to homes, playgrounds, businesses, bodies of water, etc. The National Ambient Air (2uality Standard for PM-10 according to 40 CFR Part 50 is 150 Ng/m3 over a 24 hour period. 450 pg/m3 over an eight hour period may provide a rational method for applying the EPA criteria, provided no emissions occur from the worksite during the remaining 16 hours. Monitoring should be conducted for a few days prior to beginning the work (for8 hoursto 24 hours perday, as appropri- ate) in order to establish background levels. Depending upon the variability of the results, full-time background monitoring throughout the project may be necessary. 5.5.3 Method C-0ccupational Monitoring of Area Emis- sions for Lead: When lead paint is being removed, air quality measurements for lead can be determined in accordance with NIOSH Method 7082 or equivalent, using personal monitors outside of areas or equipment that may potentially emit lead. Action Level lead limits are 30 Ng/m3 (0.03 mg/m3) per OSHA General Industry Standard 29 CFR 1910.1025 and OSHA Construction Industry Standard 29 CFR 1926.62. The perimeter of the work area should be isolated using signs, barriers, and ribbons in all locations where the Action Level is exceeded. Areas and equipment that should be monitored and isolated include, but are not limited to, the containment, dust collector, and abrasive recycling equipment. 5.5.4 Method D-EPAAmbient Air Monitoring forToxic Metals: When removing paints containing toxic metals, air quality measurements for the toxic metals can be made by instrument monitoring in accordance with EPA criteria. The selection of monitoring locations should be based on fac- tors including wind direction, surface or terrain irregularities, and proximity to homes, playgrounds, businesses, bodies of water, etc. Depending upon the variabiliry of the results, full-time background monitoring throughout the project may be necessary. High volume air samplers equipped for the collection of total suspended particulate (TSP) are used. When removing paints containing lead, the filters are analyzed for lead in accordance with the EPA 40 CFR Part 50, Appendix G. The National Ambient Air Quality Standard for Lead according to 40 CFR Part 50 is 1.5 Ng/m3 as a 90 day average. NOTE: Since paint removal operations are not normally conducted continuously over a 90 day period, it may be nec- essary to establish a daily criteria for monitoring. Note that the suggested modification of the procedure shown below may not be acceptable to state or local environment officials. The appropriate officials should be contacted prior to its implementation. DA =(90 = PD) x 1.5 Ng/m3 DA = Daily Allowance (Ng/m3) PD = Number of preparation days anticipated in a 90-day period The above calculation provides an allowance criteria for a 24-hour period. In order to convert this value to an allowance corresponding to the hours worked, do the following: ADA = DA (24 = H) ADA = Adjusted Daily Allowance ({.rg/m3) DA = Daily Allowance (Ng/m3) H= Hours worked in 24 hours 5.5.5 Method E-Soil Analysis forToxic Metals: Apre-job and post-job soil analysis for toxic metals (e.g. lead) is useful for determining if adequate ground protection was employed. Prior to project start-up, select test sites beneath the structure if applicable and a minimum of one to two from 10 to 100 ft(3 to 30 m) away from the structure in each of four direc- tions. Long structures such as bridges may require additional sampling locations. Document the specific location of each site. At each test site, center and align a 1 ft2 (30.5 cm2) template parallel or tangential to the structure. Remove a sample of soil 3/4 in (1.9 cm) in diameter and 1/2 in (1.3 cm) in depth at the center of the square and at each of the four corners. Combine the five soil plugs in a single bag to represent the sample at the given location. At project completion, return to the same locations and remove a similar sample. Analyze the pre-job and post-job soil samples for the appropriate toxic metals in accordance with EPA Method 3050 or equivalent. The specifier must establish the increase allowable, if any. NOTE: It should be recognized that the preexisting levels of toxic metals in the soil (e.g., lead) can vary considerably from one location to the next (even within one or two feet) due to prior land use, past paint removal projects, previous paint spills, leaded gasoline, and other factors. This should be taken into consideration when specifying the use of soils tests and when interpreting the results. 9-10