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�v x <br /> ` Vapor emissions from trenches should be meaoured while <br /> the trench is being dug. The monitoring instrument should be <br /> Placed near the backhoe operator and the instrument alarm set at <br /> fa the action level. <br /> 1 =: <br /> 509.11 AREA CONTROL <br /> Access to hazardous and Potentially <br /> # spi11 sito reduce the <br /> es must be controlled thazardous areas of <br /> probability of i <br /> occurrence of physical injury and chemical exposure of field <br /> " personnel, visitors, and the public. <br /> it <br /> hazardous area includes any area where hazardous or potentially <br /> (1) field personnel are <br /> required to wear respirators, <br /> (2) borings are being drilled with <br /> powered augers, or (3) excavating operations with heavye <br /> 1•:t E <br /> are being performed. equipment <br /> N <br /> The boundaries of hazardous and potentially hazardous <br /> areas must be identified by cordons, barricades, or emergency <br /> i <br /> ` '✓ traffic cones or posts, depending on conditions. If such area <br /> s are <br /> ' <br /> left unattended, signs warning of the danger and forbidding entry <br /> must be placed around the <br /> perimeter if the areas are accessible to <br /> the public. Trenches and other large <br /> wooden or metal barricades s holes must be guarded with <br /> p. „d no further than 20 feet apart and <br /> connected with yellow or yellar-and black nylon tape not less than <br /> 3/4-inches wid-. The barricades must be placed no less than, two:-: <br /> feet from the edge of the excavation or hole. <br /> I <br /> Entry of hazardous areas shall be limited to individuals <br /> who must work in those areas. T1nof'"icial visitors must not be <br /> permitted to enter hazardous areas while work in those areas is in i <br /> progress• official visitors should be discouraged from entering <br /> hazardous areas, but may be allowed to ente,�7 only if they agree to <br /> abide by tha provisions of this document, follow orders issued by <br /> +. <br /> HAS-PRO507 <br /> HS-507-8 <br /> November 1990 <br /> ,4 • <br />