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Wat <br /> er Adia. <br /> t <br /> m <br /> S <br /> 6in. <br /> ae Closet Collar <br /> Bar(318" rryin. dia.� <br /> Piping Material may be either <br /> ASTM D2665, D1785 or D3034 <br /> Observation pipes most: <br /> • be located such that there are a minimum of two installed in each dispersal cell at opposite <br /> ends from one another <br /> • be located near the dispersal cell ends <br /> • he at least 6 inches from the end wall and sidewall <br /> • be installed at an elevation to view the horizontal or level infiltrative surface within the <br /> dispersal cell <br /> Observation pipes maybe located less than 6 inches from end walls or side walls if specified in <br /> state-approved manufacturers'installalion instructions. <br />