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GEOMATRIX <br /> • pH: Microbes that degrade petroleum hydrocarbon compounds prefer pH values <br /> ' between 6 and 8; in addition, microbial activity can change the pH of groundwater. <br /> The depletion of electron acceptors MO, nitrate, and sulfate), accumulation of metabolic <br /> byproducts or intermediates (dissolved iron and alkalinity), reducing condition (negative ORP <br /> measurements), and/or lower pH in the groundwater affected by dissolved petroleum <br /> hydrocarbons indicate intrinsic biological activity in the subsurface. <br /> 1 <br /> 1 <br /> I:NROJECA2000sU4W OOCUMENr2463 12-021ptdw B-2 <br />