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Multiple metrics are used in the calculation of the overall B-IBI, including Shannon-Weiner species diversity index, total species abundance, total species biomass, and others (Llansó, 2002). Summary statistics for each metric are scored on a ranking of 1, 3, or 5, with least disturbed sites receiving a 5 and severely degraded sites receiving a 1. The scoring is done by comparing observed metrics with established thresholds derived from reference data (Llansó, 2002). The overall B-IBI score is then calculated by averaging the scores for all individual 1-5 metrics. The Chesapeake Bay Benthic Monitoring Program classifies benthic community condition into four levels according to the following breakpoints: \u201cmeets restoration goals\u201d (≥3.0), \u201cmarginally degraded\u201d (2.7-2.9), \u201cdegraded\u201d (2.1-2.6), and \u201cseverely degraded\u201d (≤2.0) (CBP, 2012; Llansó, 2002). 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