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T, - APR-05-99 14:15 From:YY00DWARD CLLYDE� } fr- 7-122 V OTAT Job-942 <br /> Task 5-Estimation of Natural Attenuation(degradation) <br /> The natural attenuation/degradation rates, including mass half lives for TPH and benzene will be <br /> i' <br /> estimated using mass-balance equations and historical groundwater monitoring data. Current <br /> gmundwater data including petroleum hydroearlxm analyses;hand iriorganie analyses will be <br /> compared to historical organic and inorganic data to assess potential ,trends of degradation (Le, <br /> the amount of electron acceptors, oxygen-containing anions (which;are indicators of natural <br /> degradation,will be assessed during the April 7 and 8 field work), <br /> CAc UwisIMkta-JwrkP in2.doc <br /> ,M <br />