29. Data collected by a measurement instrument between the time of the last verification of the accuracy of the instrument with a relative error within the +/-5% range and the time when a calibration is performed pursuant to the second paragraph of section 28 must be used or corrected to quantify the GHG emission reductions attributable to the project as follows:(1) when the relative error calculated using the equation referred to in the fourth paragraph of section 27 is negative, the promoter must use the measured values without correction;
(2) when the relative error calculated using the equation referred to in the fourth paragraph of section 27 is positive, the promoter must correct the measurement of the volumetric flow of the landfill gas by the project flow meters or the measurements of CH4 concentrations by the project analyzers by multiplying the flow or concentration measurement by the relative error obtained using that equation.