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10.0 DATA GAPS <br />The federal AN rule [40 CFR 312.10(a)] and ASTM E 1527-13-05 identify a "data gap" as the <br />lack or inability to obtain information required by the standards and practices of the rule despite <br />good faith efforts by the Environmental Professional or the User. The intervals between <br />Standard Historical Sources exceeded the ASTM minimum standard. However, the usage of <br />the Site between the gaps appears the same and additional research is not required. <br />M <br />