TR 07-02 - Sanas

TR 07-024.3 Monitoring Station Design and Site (Probe) Location and sampling system4.3.1 For compliance monitoring refer to the National Framework for Air QualityManagement in the Republic of South Africa, 2007 and Limits for common pollutants,SANS 1929:2009. The facility shall validate any deviations from these requirementsand consider any significant impacts and seek agreement with the customer.4.3.2 The minimum requirements for station design, location, & sampling system are:a) Ambient analysis equipment must be designated as equivalent methods by theEPA or other internationally recognised bodies for example USEPA, TUV orMCERT.b) Test procedures employed must be equivalent to those employed byorganisations such as EPA and TUV using accredited laboratories.c) The enclosure must be weatherproofed and temperature controlled.d) The station must be secure and allow only restricted access.e) The station must be clear of tall obstructions that may impede measurements.f) The sample train should be designed with a minimum of kinks, joints, reducers,etc.g) The sample manifold should be designed for easy cleaning and cleaning shouldbe carried out at least monthlyh) The sample manifold and system must be routinely checked for leaks.i) The entrance to the probe should be located 3-15m above ground level.j) If located on the side of a building, it should be on the windward side relevant tothe prevailing winter wind direction.k) The probe inlet should be at least 1m vertically or horizontally away from anysupporting structure and also away from dirty, dusty areas.l) No furnaces or incineration flues or other minor sources of pollution (SO 2 )should be nearby.m) If the inlet probe is located on top of a roof or other structure, it must be at least1m from walls, parapets, etc.n) The inlet to the probe must be located away from tall buildings or obstacles.The distance between the inlet probe and the obstacle must be at least twicethe height that the obstacle protrudes above the inlet of the probe.o) Air flow must be unrestricted in an arc of at least 270° around the probe inletand the predominant wind direction for the season of greatest pollutantconcentration potential included in the 270° arc.p) If the probe is located on the side of a building, 180° clearance is required.q) Inlet sample material must be manufactured from borosilicate glass or FEPTeflon or their equivalents.r) Sample residence time must be less than 20 seconds.s) Trees can provide surfaces for absorption and act as an obstruction to normalwind flow patterns.©SANAS Page 5 of 12