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pit. This is necessary in order to keep surface runoff coming from <br />• snowmelt in Area 31 out of the pit. The design calculation for the <br />ditch is shown on Table MR 87-17, and the location on Figure MR 87-17. <br />Each air pollution collection and control facility is shown on the Air <br />Quality Monitoring Network (Map 45). <br />• <br />C~ <br />780-57{a) Revised 04/10/87 <br />