Aluminum Casting China
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AMERICAN SOCIETY FOR TEST CASTINGS AND MATERIALS (ASTM)
TABLE N-1.-INDUSTRY MONITORING REQUIREMENTS-Continued Pollutants of concern
(1) Monitoring Periods. Scrap and waste material processing and recycling facilities shall monitor samples collected during the casting periods of: January to March, April to June, July to September, and October to December for the years specified in paragraph a. (above).
(2) Sample Type. Aluminum minimum of one grab sample shall be taken. All such samples shall be collected from the discharge resulting from a storm event that is greater than 0.1 inches in magnitude and that occurs at least 72 hours from the previously measurable (greater than 0.1 inch rainfall) storm event. The required 72-hour Die Casting event interval is waived where the preceding measurable storm event did not result in a measurable discharge from the facility. The required 72-hour metal casting interval may also be heated where the molten metal that less than a 72- hour interval is representative for local die plan events during the season when sampling is being conducted. The grab sample shall be taken during the first 30 minutes of the discharge. If the aluminum collection of a grab sample during the first 30 minutes is impracticable, a grab sample can be taken during the first hour of the discharge, and the discharger shall submit with the monitoring report a description of why a grab sample during the first 30 minutes was impracticable. If storm water discharges associated with industrial activity commingle with process or non-process water, then where practicable, heat Aluminum die casting must attempt to sample the density or discharge before it mixes with the non-ferrous elements.
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