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95% shade factor flexible shrouding material supported by a flexible cable style <br />structure. The joints must be fully sealed and the entryway must be <br />overlapped. Forced air through the use of fans or blowers must be used to <br />move air inside the containment structure at a minimum cross draft velocity of <br />100 ft./min or minimum down draft velocity of 60 ft./min. If dust collectors <br />are used, they must be sized using the controlling minimum velocity and <br />must be positioned to trap and filter air before it leaves the structure. <br />2. The Contractor must inspect the structure thoroughly to insure the <br />containment structure can be properly supported. This includes inspection of <br />the roof support system prior to containment support system design. <br />3. The Contractor must submit containment system design to include dead load <br />considerations to the Engineer for review. Sizing criteria for dust collectors, if <br />used, must also be included. The design must also address removal of the <br />containment support system from the structure to insure the new coatings are <br />not damaged. <br />35.06 CRITERIA FOR CONTROLS OVER ENVIRONMENTAL EMISSIONS <br />1. Monitoring environmental emissions to include all costs associated with <br />obtaining and operating the required equipment and testing procedures are the <br />responsibility of the Contractor. Air and soil conditions will be monitored by <br />the Contractor for this period. <br />2. Air quality in the immediate vicinity of the project will be monitored by the <br />Contractor to insure it is not contaminated with lead due to the Contractor's <br />work methods in removal of the lead paint. <br />Note: This is the purpose of the containment system and the air monitoring is a <br />check on how well the containment system is working. <br />3. Ambient Air Quality - the criteria for assessing the adequacy of the controls <br />over lead particulate emissions will be as follows: <br />3a. Emissions in excess of 6.75 micrograms per cubic meter of TSP (total <br />suspended particulate) Lead over an 8 hour period will be <br />cause for shutdown of the project until corrections to the containment are <br />made to comply with this level. <br />TS35-~ _ 464 <br />