Annual surveys are undertaken to sample bottom-sediment for biological and geochemical analyses at six stations at a depth of approximately 34 m in the vicinity of the Waianae Wastewater Treatment Plant outfall diffuser on the leeward coast of Oahu, Hawaii. All stations had sediment fractions with >90% sand. Silt fractions were no more than 4% at any station. Oxidation- reduction-potential (ORP) and total-volatile-solids measurements of these sediments indicated a nonreducing benthic environment at all stations. This data set contains examination of the sediments for species, abundance, and richness of nonmollusks, crustacean, molluscan, nematode, oligochaete, and polychaete faunas. A PDF document provides annual summaries for 2001-2010 while data files hold similar data for 2006-2009.