Site B (Fig. 2) is located on the southwest coast of Puerto Rico and was named Kapitan Egorov after the Russian oil tanker that ran aground close to this site in 1995. This site consist of an extensive shelf edge reef located about 1.5 km south of Guayanilla with a spur and groove formation. Sponge samples were collected at the crest of the spur where invertebrate fauna are supplied with the hard substrate infrastructure of the reef and sediment samples were collected from sand that collects within the groove. Sponges were collected at a depth of 14 m and sediment samples were collected at 15 m. Sedimentation rates are moderate at Kapitan Egorov with an average sedimentation rate of 419 mm/yr supplied by the Guayanilla River (Larsen and Webb 2009).