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3recCrrufcaf Appmaaff Page 7 Task 2.5 1 fi ion of h e +o l iia_ 1Following the completion of the above sections, a full evaluation of the type, sensitivity, and compatibility of the nearshore environment will be presented. The Hardbottom/Reef Mapping will be presented on video for each hardbottomfreef In the respective Project area that Is used as a video station. An inventory list of each species observed on the video will be included for each reef shown. The Biological Assessment of each 40 hardbottomi'reef will be presented with underwater photographic documentation at each quadrat, along with a species list for each sample station. Benthic communities will be statistically compared to evaluate changes in faunal abundance, and number of species present among sample sites and controls over time. Analyses will include analysis of variance (ANOVA) or non—parametric Kruskal-Wallis test, as necessary. Comparison among specific treatment groups will be completed using Student-Newman-Keuis gist (parametric and unparametric design). Diversity Indices may be computed from each area (ail samples combined) using Shannon's diversity index (H), species richness (SR), and evenness (J). Changes in overall community composition among sites and seasons can be evaluated using a proportional similarity coefficient (Bray -Curtis) with a flexible sorting strategy and a cluster intensity (13) of —4.25. Task 2.6 Evaluation of Hardbottom Areas and Potential Sediment Im acts The results of the nearshore field investigations and laboratory studies will be summarized in a report entitled "Hardbottom Mapping and Characterization for the Indian River County Beach Preservation Plan Project Sectors 1, 2, 3, 5 and 7". In addition, hardbottom characterization maps will be prepared documenting the acres, types of hardbottom areas and locations associated with each Beach Nourishment Project area. Ninety days from Notice to Proceed is the time frame anticipated to collect the field data and conduct the analysis described above. Task 2,7 Sector 5 Verification of 1993 Hardbottom Mapping and Characterization A study of the nearshore hardbottom area offshore of Sector 5 was conducted for Indian River County in 1993. Due to the extensive mapping and characterization effort expended during this study, FDEP is requiring that the County conduct a verification -level field investigation and characterization of the nearshore hardbottom resources within the Sector 5 study limits. FDEP Bureau of Beaches and Coastal Systems requires that verification of the 1993 study be conducted by replicating 8 of the 32 shore -perpendicular transects and four of the 13 photoquadrats. As it was determined that a relatively uniform spatial distribution of transects be replicated throughout the fill project limits, staff at the Bureau of Beaches and Coastal Systems were consulted to determine the location of the transects. The location of the eight transects are as follows: R-73, R-74,5, R-761 R-77.5, R-79.5, R-81.5, R-84, and R-88.5. Transects will be run over a distance of 2,044 ft. from the shoreline in a seaward dirction or vice -versa (i.e. in one direction only as the previous study ran each transect line essentially twice). In addition, a share -parallel transect will be conducted which will follow the nearshore edge of the reef feature over the entire length of the Sector 5 shoreline. Underwater video taping will be performed by experienced marine biologists along each of the transect lines. The four photoquadrat stations to be re-established are: IN -N-1, V1313-19-774, CMS -19- 1197, and IN -S-1'. These stations were selected (based on concurrence with Mr. Lutz of the FDEP Bureau of Beaches and Coastal Systems) to represent two stations with a high percentage of worm rock, and the other two stations representing a high degree of NO - diversity. An attempt will be made to field -locate these existing stations (assumed to be PVC pipes or similar permanent fixtures in rock outcroppings) utilizing on -board DGPS, with stationary underwater photographs taken at each station. to Q+v"aa.0 SCaw 00 WWX 041,Wrt,