JIKMY .NE - DAINOS ConmD. No. a0 Buzzards Bay Disposal Site Feb 199 | Baseline Study, March 1990 Disposal Area Monitoring System DAMOS Contribution 80 February 1991 Had) US Army Corps of Engineers New England Division AE | wisdes | Dede | Wares) REPORT DOCUMENTATION PAGE OM@ No. 0704-0188 PUGET FEEETERG GUFESA (OP (PR CONETTION OF ‘AIGFMONGR © CUMMSTTS (0 BEV 8SR | “OU! GET (SOM “ACIUBING (RE IMD (OF (ONTERAD (OUFUTUOM. WETTER CURURG Gals WUSTH. QOCRERARD GAD METEUUAT (AO ESD ATTSSS. OAS CORETEAD OAD (CTINAT (HP CONTTTIOR OF ‘SVOFROTON +ORE COMRINE (UCEFEAS (M7) CUTEST GUUS OY OY CURET UEETT 01 TAr CONGTEEN CF WIGFIREMEN. ACAEEAD WGGSUEE (OF (USUI INQ SUFETR [0 WEUERSTOR MOEESUSTTON tervernh OWGTISrETe fay IWTOrMeNSA USETSUST ane RewErE 1219 JerTERION Ogun cugeusey, esen 1108 ArmneEDR. V4 12302-0102. one TS (RO UTNCR OF MansRemEN One GusSH COSSTEETE REETUSR CPMOCT (0 704-0 168). Wewwnstan. OC 1059). 1. AGENCY USE ONLY (Leave olena) is REPORT OATE 3. REPORT TYPE ANO OATES COVERED 1991 4 TITLE ANO SUBTITLE 5. FUNDING NUMBERS Februa Buzzards Bay Disposal Site Baseline Study, March 1990 6 AUTHOR(S) 7. PERFORMING ORGANIZATION NAME(S) ANO AOORESS(ES) @. PERFORMING ORGANIZATION REPORT NUMBER Science Applications International Corporation 221 Third Street SAIC-90/7582 & C86 Newport, RI 02840 9. SPONSORING, MONITORING AGENCY NAME(S) AND AQORESS(ES) 10. SPONSORING, MONITORING AGENCY REPORT NUMBER U.S. Army Corps of Engineers - New England Division 424 Trapelo Road DAMOS Contribution No. 80 Waltham, MA 02254-9149 11. SUPPLEMENTARY NOTES Available from DAMOS Program Manager, Regulatory Division USACOE-NED, 424 Trapelo Road, Waltham, MA 02254-9149 12a. OISTRIBUTION/ AVALABILITY STATEMENT | 12 DISTRIBUTION CODE Approved for public release; distribution unlimited. 13. ABSTRACT (Magmum 200 woras) From 27 to 29 March 1990, field operations were conducted at the Buzzards Bay Disposal Site to provide information on the effects of past disposal operations and establish baseline conditions for future monitoring. Field operations included a precision bathymetric survey, REMOTS® sediment profile photography, and sediment sampling for benthic, chemical, and physical analyses. The information obtained from the bathymetric survey and REMOTS® photos permitted the detection of two disposal mounds within the surveyed area. The primary mound was central to the disposal site, 1.2 m high and 60 m wide. The other, south and west of the center mound, was 1.6 m high and approximately 90 m wide. The major modal grain size over the surveyed area ranged from medium sand (2-1 phi) to silt-clay (=4 phi). All stations containing a major mode of medium (2-1 phi) and fine (3-2 phi) sand fractions were rippled. The distribution of the major modal grain size, as deduced from REMOTS® photographs, indicated a net bedload sediment transport of fine-grained material to the southeast along an 11.6 m isobath. Currents are most likely the dominant force contributing to the transport. The disposal site center consisted of rippled bedforms and fine sands which limited penetration by the REMOTS® camera. The species composition found in this study was similar to that of benthic communities in Cape Cod Bay and Boston Harbor/Massachusetts Bay. Sediment chemistry and grain size analysis results indicated expected levels of percent fines, metals, PAHs, PCBs, and pesticides. Currently, the surveyed area is healthy biologically and relatively uncontaminated. 14. SUMJEC] TERMS 1S. MURABER OF PAGES Buzzards Bay REMOTS 81 | dredged material sediment profile photography 1& PRICE CODE sediments bathymetry | 17. SECURITY CLASSIFICATION 18. SECURITY CLASSIFICATION | 19. SECURITY CLASSIFICATION | 20. UMITATION OF ABSTRACT OF REPORT OF THIS PAGE OF ABSTRACT Unclassified NSN 7540-0 1-280-3500 »tanaara -orm 298 (Rev .-d9) —wwarrese Gy an tan (S168 Pe pa ohn Al add inca pe flan ENF 1 eel ern Ht BUZZARDS BAY DISPOSAL SITE BASELINE STUDY, MARCH 1990 CONTRIBUTION #80 | February 1991 Report No. SAIC- 90/7582&C86 Submitted to: Regulatory Branch New England Division U.S. Army Corps of Engineers 424 Trapelo Road Waltham, MA 02254-9149 Submitted by: Science Applications International Corporation Admiral's Gate 221 Third Street Newport, RI 02840 (401) 847-4210 US Army Corps of Engineers New England Division ‘hiksciatladmt Mined oiaew sirmeiean eriarbedl= ones emesis i Lp OAH A cn wo a ret TN ON Dane st epee Hottaytt cho Rae peal) inant Wai ape ia ey geek: errs } ior cheauttt wep a aoe A AM anni sovtnarcie sarin cai : ra na hee, barat TABLE OF CONTENTS TN DRO DU GTWON Heromera cnet elciereclieteietaite fools) ol ofioiiovekelleteitc) siforeiiciiereniols 1 MES EIOD SyeverenecwelreneMenen elo toneteneteieloliclel oko of of of eliotionelletel elton cher ello) ciieteli« 2 NavaligatTongances aithiyme trsyaiemerencieleheiei en clonetolerenelencionelerene 2 REMOTS® Sediment-Profile Photography............. 3 Benches Sam pile cierereroretenaienseenel nels elon owooncnst on oreielscnaieuctens 3 Sediment samplang andi Analysis a! sehen inl Rem pad ' 7 a 7 , y i y i x se 7 RAS il Can Bi bP ite eee A a ee ee a a Th es a) by Se ee At td ea hits a” Bt alte ‘ ; A‘ Ca iets ; fom v ee ee he vealed IRR SO AE i tans x are an > a hd Wi a ee eR ab ae wo ee vu ry 4 ey ee eae ee e i ie ie Wr he : } i 4 We a gre SA ht R, yk oe Wy Oy Pray te a ee se te ee a mis m Oe _ i) I exes Ee A ee Ana NOG hota, paar e alt eo aed Table Table Table Table Table Table Table 1-1. 3-1. LIST OF TABLES Grain Size Analysis of Dredged Material Disposed of at BBDS from 5/85 - 4/90. Top 10 Dominant Species for the Benthic Sampling Locations at BBDS, March 1990. Results of Sediment Grain Size Analysis for BBDS, March, 1990. Results of Metals, TOC, and PCBs for Sediment Collected at BBDS, March 1990. Percentages of Clay and Total Organic Carbon for BBDS, March 1990. Results of Pesticides (ppb) in Sediment Collected at BBDS, March 1990. Results of PAHs for Sediments Collected at BBDS, March 1990. oldiniad, a “at est aein eee Oe ahaa camel om cae pea Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure 1-1. 3-2. 3-4 e 3-8. 3-10 © 3-11. 3-12. LIST OF FIGURES Results of side-scan interpretation of the BBDS in 1981 (from Germano et _al., 1989). The surveyed area was 2.8 km? in 1981 compared with 0.8 km’? in the March 1990 survey. REMOTS® station locations and sampling locations for benthic and sediment analyses at the BBDS, March 1990. Contoured bathymetric chart of BBDS, March 1990. Distribution of grain size major mode for BBDS, March 1990. A REMOTS® photograph from BBDS reference area 1. A REMOTS® photograph from BBDS reference area 3 showing an ambient bottom of fine-grained material and a Stage III assemblage. A REMOTS® photograph of rippled sandy bottom at the BBDS center. Successional stage is indeterminate. A REMOTS® photograph from BBDS reference area 2 showing the superposition of sand over mud. A REMOTS® photograph from BBDS station 19 which had a surface layer of mud over sand related to the presence of dredged material. A REMOTS® photograph from BBDS stations 17 and 32 showing the deposition of sand over mud possibly related to disposal events. Frequency distribution of small-scale surface boundary roughness for disposal stations at BBDS, March 1990. Frequency distribution of small-scale surface boundary roughness for reference stations at BBDS, March 1990. Distribution of dredged material at BBDS, March 1990. Mean apparent RPD depths for BBDS, March 1990. Figure Figure Figure Figure Figure Figure 3-13. 3-14. 3-15. 3-16. 3-17 e 3-18. Frequency distributions for mean apparent RPD depths for on-site and off-site locations at BBDS, March 1990. A REMOTS® photograph showing lower optical reflectance at depth due to the spring plankton bloon. The spatial distribution of infaunal successional seres for BBDS, March 1990. j The Organism Sediment Index values for BBDS, March 1990. Frequency distribution of OSI values for on-site and off-site locations at BBDS, March 1990. Sediment grain size analyses for BBDS, March 1990. EXECUTIVE SUMMARY This report presents a synopsis of relevant background information on baseline conditions at the Buzzards Bay Disposal Site (BBDS) as of March 1990. Disposal records indicate that since 1979, 92,000 m3 of dredged material consisting of relatively uncontaminated sands and silty-sands have been disposed at the site. Monitoring activities at the site have not been conducted by the DAMOS program over the past several years, because the site has been used infrequently. The largest collection of site-specific data was gathered by Germano et al., (1989) in 1981, and regional data have been summarized in an earlier report (SAIC, 1989a). From 27 to 29 March 1990, field operations were conducted at BBDS to provide information on the effects of past disposal operations. Field operations included a precision bathymetric survey, REMOTS® sediment profile photography, and sediment sampling for benthic, chemical, and physical analyses. The overall objective of the cruise was to characterize existing bathymetric, sediment grain size, sediment chemistry, and benthic conditions at and around the disposal site. Three reference areas were selected - to provide comparisons between ambient and on-site conditions and were located 3107 m northwest, 3940 m west, and 2600 m southwest of the disposal site center. The information obtained from the bathymetric survey and REMOTS® photos permitted the detection of two disposal mounds within the surveyed area. The primary mound was central to the disposal site, 1.2 m high and 60 m wide. The other, south and west of the center mound, was 1.6 m high and approximately 90 m wide. The major modal grain size over the surveyed area ranged from mediunmesand. (2-1 sphi)eeto ~silt—clay “(49 phi) All stations containing a major mode of medium (2-1 phi) and fine (3-2 phi) sand fractions were rippled. The distribution of the major modal grain size, as deduced from REMOTS® photographs, indicated a net bedload sediment transport of fine-grained material to the southeast along an 11.6 m isobath. Currents are most likely the dominant force contributing to the transport. The disposal site center consisted of rippled bedforms and fine sands which limited penetration by the REMOTS® camera. The species composition found in this study was similar to that of benthic communities in Cape Cod Bay and_ Boston Harbor/Massachusetts Bay. Species richness was somewhat higher at the reference stations; however, both on-site and off-site stations were well within the range observed in soft-bottom, shallow water environments. Significant differences existed between reference stations and on-site stations in REMOTS® parameters for RPD depth, successional stages, and OSI values. Sediment chemistry and grain size analysis results indicated expected levels of percent fines, metals, PAHs, PCBs, and pesticides. Currently, the surveyed area is healthy biologically and relatively uncontaminated. Continued monitoring of the site, through the DAMOS program, is suggested due to the proposed increase in utilization of the site. It is recommended that future physical oceanography studies of sediment transport be carried out to determine if off-site transport may be a problem. BUZZARDS BAY DISPOSAL SITE BASELINE STUDY MARCH 1990 1.0 INTRODUCTION The Buzzards Bay Disposal Site (BBDS) is located in the northern half of the bay, 1.4 nautical miles from Chappaquiot Point, West Falmouth, MA. The site is a 500 yard diameter circle centered at 41° 36.000'N and 70° 41.000'W, lying within a slight depression between the 9m (30 ft) and 12m (40 ft) isobaths. Disposal records indicate that, since 1979, 92,000 cubic meters of dredged material have been deposited at the site. From February 1979 to January 1984, an average of 17,200 m3 of material was deposited annually from small harbor and river channels throughout . the Buzzards Bay region. The last substantial use of the site was in the fall of 1985, when the Massachusetts Maritime Academy disposed of 55,000 m3 of material. Several projects recently have received permits to use the site, and 600 m> were disposed from a small project in the fall of 1989. Sediments disposed at BBDS have been relatively uncontaminated sands and sands containing some silt and clay (Table 1-1). Monitoring activities at the site have not been conducted by the DAMOS program over the past several years, because the site has been used infrequently. The largest collection of site- specific data was gathered in 1981 by Germano et al. (1989), and regional data have been summarized in an earlier report (SAIC, 1989a). A side-scan sonar and REMOTS® sediment-profile survey of the region was conducted in 1981 to characterize the historic disposal site with an area of 2.8 km?. Five major textural regions were revealed: 1.) a deposit of coarse-grained material, 2.) a small wave field possibly consisting of large sand waves overlying silt-clay sediments, 3.) a cratered bottom, 4.) a rubble bottom, and 5.) two areas of flat bottom on the east and west sides of the disposal mound (Figure 1-1). The eastern and western flat bottoms have been interpreted to represent natural ambient bottom unaffected by disposal operations. In 1981, the disposal mound apex rose to within seven meters of the sea surface and apparently was the center of prior disposal operations. The disposal site surveyed in March 1990 was smaller (0.8 km?) in area than the 1981 site and encompassed the wave field and portions of the rubble He field. The reference stations selected for the 1990 survey fall outside the area studied in 1981. Tidal currents within the disposal site average 20 cm/sec or 0.4 knots (SAIC, 1989a). Complete tidal mixing of Bay water with ocean water is estimated to occur approximately every 10 days. Water temperatures in the Bay range from a summer maximum of 22°C to O°C in winter. Salinity levels are essentially the same as those of Block Island and Vineyard Sounds, ranging from 29.5 to 32.5 ppt, due to a minimal amount of freshwater inflow (primarily groundwater seepage) (SAIC, 1989a). From 27 to 29 March 1990, field operations were conducted at BBDS to provide information on the effects of past disposal operations. Field operations included a precision bathymetric survey, REMOTS® sediment profile photography, and sediment sampling for benthic, chemical, and physical analyses. The overall objective of the cruise was to characterize existing bathymetric, sediment grain size, sediment chemistry, and benthic conditions at and around the disposal site. Based on results of the 1981 survey, the disposal site was predicted to contain a low relief disposal mound, and the bottom sediment in and around the site was expected to be heterogeneous. The benthic community at the site was believed to consist of small pioneering polychaetes (Stage I) and larger burrowing deposit feeders (Stage III) as would be typical of a shallow fishery-rich embayment. Stage III was expected to predominate at most stations due to infrequent use of the disposal site. Stage III taxa represent high-order successional stages typically found in low disturbance regimes. 2.0 METHODS 2.1 Navigation and Bathymetry The precise navigation required for all field operations was provided by the SAIC Integrated Navigation and Data Acquisition System (INDAS). A complete description of this system is provided in DAMOS contribution #48 (SAIC, 1985). Shore stations used in the 1990 field operations were established at the Falmouth fire tower (41° 35.876'N and 70° 37.093'W) and Wings Neck Lighthouse (41° 40.809'N and 70° 39.699'W). Depth was determined to a resolution of 3.0 cm (0.1 feet) using an Odom DF3200 Echotrac® Survey Recorder with a narrow-beam 208 kHz transducer. The speed of sound was determined from the water temperature and salinity data measured by an Applied Microsystems CTD probe. The bathymetric survey conducted on 27 March encompassed an 800 x 800 m grid centered around BBDS at coordinates 41°36.000'N and 70°41.000'W. Thirty-three lanes were run south to north at 25 2 m spacing.’ The objective of the survey was to map the existing bottom topography at and around the disposal site. The configuration provided adequate coverage to assess the distribution of dredged material deposited at the site. Raw depth values were corrected to Mean Low Water during analysis of the bathymetric data by adjusting for the ship draft, tidal changes during the survey, and the speed of sound. Aor REMOTS® Sediment-Profile Photography REMOTS® photography was used to detect the distribution of thin (0-20 cm) dredged material layers, map benthic disturbance gradients, and monitor the status of infaunal recolonization on and adjacent to the mound. A detailed description of REMOTS® photo acquisition, analysis, and interpretative rationale is given in DAMOS Contribution #60 (SAIC, 1989b). A REMOTS® survey was performed on 27, 28, and 29 March 1990. REMOTS® photos were taken, in triplicate, at each of 37 stations surrounding the disposal site center (Figure 2-1). In addition, 9 REMOTS® stations were occupied at each of the three reference areas to allow comparisons between ambient and on-mound conditions. The 9 stations at each reference area were arranged in a cross-shaped pattern and spaced 100 m apart. Reference areas were centered at 41° 36.30'N, 70° 43.20'W (reference area 1), 41° 35.35'N, 70° 43.70'W (reference area 2), and 41° 34.60'N, 70° 41.15'W (reference area 3). Distances from the disposal site center for the three areas were 3107 m NW, 3940 mW, and 2600 m SW. Depths for the three reference areas were 11m for reference area 1, 12 m for reference area 2, and 14 m for reference area 3. 2.3 Benthic Sampling Macrofaunal benthic community samples were taken on 28 and 29 March to ground-truth the REMOTS® photos and provide an indication of potential species for any future body burden analyses. A 0.1 m* Smith-McIntyre grab sampler was used to take samples at six stations in the disposal site (1, 13, 20, 22, 23, and 24; Figure 2-1) and at the center and 200 m W of each reference area (Figure 2-1). The samples were sieved on a 0.5 mm mesh screen, preserved in 10% formalin on board, transferred to 70% ethanol after 48 hours, and forwarded to the Cove Corporation laboratory for species identification and enumeration. 2.4 Sediment Sampling and Analysis Sediment samples were collected at each of the benthic community stations to provide a baseline and to verify the nature of material deposited at the disposal site. Samples were obtained using a 0.1 m? Smith-McIntyre grab sampler. Four polycarbonate plastic core liners (6.5 cm ID) were pushed into each sediment grab sample and extracted; the top 10 cm of sediment from three of these 3 cores were combined and placed into bags for subsequent chemical analysis. The fourth sample was saved for physical analysis. The samples were kept cold (at approximately 4°C) and submitted to the NED laboratory. The parameters measured included sediment grain size, trace metals (As, Cd, xc, Cu, Pb, Hg, Ni, ean), totallmoxrganic carbon (TOC), polychlorinated biphenyls (PCBs), pesticides and polycyclic aromatic hydrocarbons (PAHs). Analytical methods were those of the U.S. Environmental Protection Agency (EPA, 1987). 3.0 RESULTS 3.1 Bathymetry Depths in the area surveyed at Buzzards Bay Disposal Site ranged from 8.2-14.4 m (Figure 3-1). An 11.6 m contour separated the survey area into a northwest quadrant with depths ranging from 8.2 - 11.6 m and a southeast quadrant with depths up.to 14.4 m. In general, the disposal site consisted of small topographic elevations. The REMOTS® survey, taken in conjunction with the bathymetric survey, assisted in determining the nature of these elevations, i.e., whether they were natural or man-made. Three mounds were included in both the bathymetric and REMOTS® surveys: 1.) a center mound, 1.2 m high and approximately 60 m wide, 2.) a mound to the southwest, 1.6 m in height and about 90 m in diameter, and 3.) a mound, west and north of center, 1.2 m in height and 100 m in diameter. All three mounds exhibited a steeper slope to the southeast. Biel REMOTS® Sediment-Profile Photography 3.2.1 Major modal grain size and boundary roughness The major modal grain size over the surveyed area ranged from medium sand (2-1 phi) to silt-clay (24 phi) (Figure 3-2). The coarsest sediments, consisting of patches of fine to medium sands intermixed with some silt-clay, were located at reference area 1 and at the REMOTS® stations located in the northwest quadrant of the surveyed area (Figure 3-3). The finest sediments were located in the southeast quadrant of the disposal site, reference area 2, and reference area 3 (Figure 3-4). This transition occurred along the 11.6 m isobath. All stations containing a major mode of medium (2-1 phi) and fine sand (3-2 phi) fractions were rippled (Figure 3-5). Several stations showed the superposition of sand over mud, suggesting that the net sediment transport in this region was from the northwest (sand source) to the southeast (mud area). This was particularly apparent in reference area 2 (Figure 3-6). While this statement generally holds true for the mapped area, individual stations showed evidence of stratigraphy related to disposal events 4 rather than lateral transport. For example, Station 19 had a surface layer of mud over sand apparently related to the presence of dredged material (Figure 3-7). Sand over mud at stations 17 and 32 may also be related to disposal events (Figure 3-8; see section 3.4 below). The disposal site center (station 1) consisted of rippled bedforms and fine sands which limited penetration by the REMOTS® camera (Figure 3-5). The small-scale boundary roughness frequency distribution for the disposal site showed a major mode at 1.0-1.4 cm (class 3) with values as high as 2.6-3.0 cm (class 7; Figure 3-9). The mean Wastin Ot) 0/56) (em) (n—100))). The origin of this roughness was related largely to the presence of rippled bedforms in the sandy facies and biogenic (bioturbational) features in the mud facies. On dredged material, small-scale boundary roughness can also be related to the presence of gravel deposited at the site. The boundary roughness frequency distribution for the reference stations indicated a major mode at 0.6-1.0 cm (class 2), and a mean of 0.80 £0.43 cm (n=27; Figure 3-10). Boundary roughness values at the disposal site were significantly greater than the reference areas (p<0.05, Mann-Whitney test). Reference areas were located in areas with a lower kinetic energy regime . (i.e., fewer bedforms) and lacked dredged material. 3.2.2 Distribution of Dredged Material The "footprint" of past disposal at the Buzzards Bay site was determined primarily from REMOTS® photos; the presence of dredged material was indicated by chaotic sedimentary fabrics and anomalous grain size distributions at the site (Figure 3-11). The bathymetric survey showed a 60 m wide mound at the center of the site with a height of 1.2 m. The distribution of dredged material, as deduced from REMOTS® photographs, extended well beyond this mound. Dredged material extended at least 100 meters west and 200 meters east of the mound apex. Most of the area occupied by disposed material was located south of the mound apex (to at least 200 meters south). Station 28, located 200 meters south and west of the mound, was apparently located on a second 1.6 meter-high mound of dredged material. 3.2.3 Mean Apparent RPD Depth Distributions Steep spatial gradients existed between the disposal site, where most RPD values fell between 2 and 4 cm, and the three reference areas, where most values were greater than 4 cm (Figure 3-12). The mean apparent RPD depths for the reference areas were significantly greater than those for the disposal site (p<0.05, Mann-Whitney, Figure 3-13). The mean value for reference stations was 5.7 + 2.14 cm while the mean apparent RPD depth distribution for the disposal site was 3.43 + 1.25 cm. Discrimination of mean apparent RPD depths was particularly difficult in this March survey. Most photos showed that the near-surface region of the sediment profile had a lower optical reflectance than at depth (Figure 3-14). Our experience has shown that late winter to early spring sediment profiles have this transient feature related to the recent sedimentation of labile (reactive) planktonic detritus. The spring plankton bloom takes place in this period with sedimentation of eaten or senescent cells. The decay of this material on the bottom lowers the optical reflectance of the near-surface layers of sediment. To avoid this difficulty in the future, surveys should be scheduled for the summer period. 3.2.4 Infaunal Successional Stages The spatial distribution of infaunal successional seres at the reference stations, as inferred from REMOTS® photos, showed a high frequency of well-developed Stage III seres (Figure 3-15). Toward the center of the disposal site sampling grid, station replicate photographs showed patchy mixtures within a station; some pictures contained evidence of Stage III infauna while others showed only Stage I seres. This type of patchiness is typical of relatively thin-flank deposits where past disposal has resulted in small spatial differences in mortality of Stage III residents. Within-station patchiness also may be related to small-scale differences in recruitment success of Stage III taxa. The cause of this patchiness is due either to minimal impacts at localized regions or to sufficient time for infaunal recovery coupled with a lack of recent disturbance. Stations located at the center of the disposal site and north and west of the center apparently are dominated by Stage I seres. Notable exceptions are Station 21, located on relict dredged material, and Station 8, located on the ambient bottom. 3.2.5 Organism-Sediment Indices Past mapping experience has shown that OSI values less than +6 indicate bottom disturbance by either chemical or physical means. Only those stations with mean OSI values < +6 were contoured) and, inelude stations) 4)7 ls 9 2210), 215) Zoya eamiclans 4 (Figure 3-16). With» the! sexception sormStativon sal aallmor mthese stations were located on dredged material. The first six stations were located around the center of the disposal site. The three reference areas all had uniformly high OSI values, typical of undisturbed bottoms. The OSI frequency distribution for the disposal site shows a distinctly bimodal distribution with a mode at +5 and another at +11 (Figure 3-17). Some disposal site stations were located on dredged material (+5 values) while others were located on the ambient bottom (+11 values). The reference areas (combined) 6 have uniformly high OSI values of +11 and were significantly greater than disposal site stations (p<0.05, Mann-Whitney). Yo) Benthic Sampling A total of 148 taxa were found in the benthic samples taken at stations 1, 13, 20, 22, 23, and 24 from the disposal site and from the reference stations R1, R2, and R3. The largest number of taxa (67, 45 % of the total fauna) were polychaetes, followed by molluscs (35 taxa, 24 %) and crustaceans (29 taxa, 20 %). Other major taxonomic groups, such as_ cnidarians, nemerteans, echinoderms, and tunicates, contributed only small percentages to the total fauna. The total number of species was between 40 and 65 per station at the disposal site and between 45 and 71 per station at the reference areas. Densities were between 4,800 and 9,800 individuals per m* on the disposal mound, with the lowest density found at station 1 and the highest density found at station 22. Densities at the reference stations ranged from 5,100 to 9,400 individuals per m?. The top 10 species by station were defined by only 25 of the 148 taxa constituting the total fauna (Table 3-1). The polychaete Mediomastus ambiseta ranked first at all disposal © site stations and the reference station R1; at reference stations R2 and R3, it ranked second and third, respectively. Another polychaete, Ninoe nigripes, was also found at all stations, ranking between 2 and 9. Other taxa present at all disposal mound stations, but not all reference stations, were Oligochaeta and the nemertean Tubulanus pellucidus. Stations 1, 20, 22, 24, and R1 clearly were dominated by Mediomastus ambiseta; the species contributed between 30 and 44 percent of the total number of individuals. Other top ranked organisms were Oligochaeta (stations 1, 20, 24, and R1), the polychaete Aricidea catherinae (stations 24 and R1), Ascidiacea (stations 1 and 20), the nemertean Tubulanus pellucidus (station 22), and the mollusc Cylichnella bidentata (station 22). Stations 23 and 13 were characterized by the polychaetes Mediomastus ambiseta, Aricidea catherinae, Ninoe nigripes (station 23), and Spiophanes bombyx (station 13) in the highest ranks, with Mediomastus contributing only about 20 percent of the total number of individuals. The reference stations R2 and R3 differed somewhat from the other stations sampled for this program. At station R2, relatively high numbers of Ascidiacea were found, together with the polychaetes Cirrophorus furcatus, Mediomastus ambiseta, and Ninoe nigripes, each contributing 11 to 16 percent of the total number of individuals. Station R3 was characterized by two molluscs (Cylichnella bidentata and Nucula proxima) in high ranking positions (1 and 3 out of the top 10) and only one polychaete (Mediomastus) which ranked 2 out of the top 10. The similarity of the stations in terms of their benthic infauna can be estimated roughly by assessing the number of dominant species shared between each possible couplet of stations. Out of the 10 top dominants, about 7 taxa (6-9) were shared between all disposal mound couplets, whereas only 2 to 5 species were shared between reference station couplets. Comparison between the mound and reference stations shows that 7 to 8 species were shared between stations R1 and each mound station (except station 22 with only 4 species shared); 6 species were shared between stations R2 and each mound station, but only 4 species were shared between stations R3 and each mound station (except for station 22 with 6 species shared). The total number of taxa and individuals per benthic sampling station at BBDS is provided in Appendix A, and a comprehensive list of macrobenthic invertebrates collected from BBDS is provided in Appendix B. Two species are suggested for future body burden analysis, Ninoe nigripes and Nephtys incisa. Both of these species are sufficient in number and size to allow for collection, concentration, and subsequent clean preservation (freezing). Mediomastus ambiseta and the remaining species in the dominance lists are small and do not lend themselves readily to collection procedures. 3.4 Sediment Analysis odo al Grain Size Analysis Physical and chemical parameters were developed in 1980 by the New England River Basin Commission (NERBC) to assist in interpreting the nature of dredged material. NERBC classifications were used for interpretation of percent fines (percent silt and clay) and in the following section on sediment chemistry for interpretation of metals, pesticides, and PCB results. The distribution of sediment grain size (Table 3-2 and Figure 3-18) corresponds with that mapped from REMOTS® photos (see Figure 3-2). Major modal grain size over the surveyed area ranged from medium sand (2-1 phi) to silt-clay (24 phi). The percent silt and clay for the disposal site stations and reference areas 1 and 2 fell into the NERBC Class 1 (< 60%) category. Reference area 3 contained a Class II (60-90%) level of silt and clay. Fine sands (4-2 phi) dominated over medium sands (2-1 phi) for all stations tested, except at the center of reference area 1, where the percent of fine and medium sands was equal at 44%. Results for reference station 1-200W and reference station 3- 200W also demonstrated a fairly even distribution between medium and fine sands. Percentages of medium sands were, however, much lower for reference area 3. Station 1 center and station 20 contained the highest percentages of sands, 94% and 97%, respectively. 3.4.2 Sediment Chemistry The sediment collected at BBDS contained low NERBC concentrations of As, Cd, Cr, Cu, Pb, Hg, Ni, and Zn (Table 3-3). Metal concentrations tended to be higher in stations containing greater percentages of clay and total organic carbon (Table 3-4), namely reference area 3, center and 200W, followed by stations 23, 22, 24 and 13. Stations 1, the disposal site center, and 20 had the lowest concentrations of metals. The pesticides tested belong to the group’ of organochlorines and fall within the general classification of chlorinated hydrocarbons (Table 3-5). Pesticide levels at BBDS were very close to or below method blank values for all compounds tested. Concentrations of all pesticides were slightly higher at reference area 3 and station 13. Levels of DDT and dieldrin were well below the high (NERBC) concentrations of >0.2 ppm and 0.1 ppm, respectively. Concentrations of PCBs were below 0.5 ppm and met the NERBC low limit of <0.5 ppm. The majority of high molecular weight PAHs were low in comparison to concentrations measured for highly contaminated estuarine sediments such as those at New Bedford Harbor (Table 3-6; Pruell et al., 1990). No method blank results were reported for this analysis, and NERBC criteria do not exist for PAHs. Detection limits were higher for the lower molecular weight compounds napthalene, acenaphthylene, and acenaphthene. Low concentrations of the following higher molecular weight PAHs were detected at reference area 3: phenanthrene, flouranthene, benzo(b)- flouranthene, and benzo(a)pyrene. Pyrene was found in low levels at stations 24, 13, and 20. 4.0 DISCUSSION 4.1 Bathymetry Based on results from the bathymetric survey and REMOTS® photographs, two mounds were determined to originate from disposal activity: the center mound, 1.2 m high and approximately 60 m wide, and a 1.6 m high mound about 90 m in diameter to the southwest. 4.2 REMOTS® Sediment-Profile Photography The distribution of the major modal grain size over the surveyed area, as deduced from REMOTS® photographs, indicated a net bedload sediment transport of fine-grained material to the southeast. Stations containing a major mode of medium (2-1 phi) and fine sand (3-2 phi) fractions were rippled, and the superposition of sand over mud at stations not located on dredged material suggests that the net bedload transport of fine-grained material was from the north and west (source area) toward the 9 south. The overall grain size distribution generally corresponds to that mapped at this site in a combined side-scan and REMOTS® survey in 1981 (Germano et al., 1989). Further physical oceanographic studies of sediment transport within the BBDS are recommended to determine if off-site transport of disposed material may be a problem. The topographic apex of the central mound was a small (60 m wide) feature with flank deposits located south of the mound. Dredged material deposits extended to 200 m east and 100 m west of the mound apex. The thin nature of the mean apparent RPD depths on the mound apex and at stations 2, 3, and 16 probably were related to natural disturbance in this area (sediment transport as manifested by rippled sands). Deep bioturbators (Stage III taxa) were not observed in areas north and west of the grid center. Depth of the RPD is controlled largely by the depth of bioturbation, and the absence of Stage III seres in these areas supports this inference. The distribution of Stage I seres around the disposal site center and to the northwest apparently was related to the disturbance of the bottom by dredged material and/or bedload transport of sand. The balance of stations showed within-station patchiness, with some replicates showing the presence of Stage III seres and others only Stage I seres. The photographs from all 3 reference areas contained evidence of Stage III infauna. These results are similar to those found in the 1981 survey; the "Rubble Field" was populated by Stage I organisms, and the "Wave Field", to the south and east of the disposal site center, was populated by Stage I, I-II, and III infauna (Figure 1-1; Germano et al., 1989). The overall distribution of Organism-Sediment Indices shows that all reference areas represented undisturbed benthic habitats with mature successional assemblages. Areas where OSI values were <+6 were concentrated on the mound apex with the exception of stations 11 and 34. OSI values were not calculated for stations in the 1981 survey, so a comparison cannot be made for this parameter. This REMOTS® data set showed significant statistical differences in the distributions of mean apparent RPD depths, successional stages, and OSI values between the disposal site and the three reference areas. This data set should allow for detection of change in future surveys for both reference and disposal site stations. 4.3 Benthic Communities The species composition found in this study was similar to that of benthic communities in Cape Cod Bay (Battelle, 1987) and Boston Harbor/ Massachusetts Bay (Blake et al., 1987, 1989). 10 However, there were some differences with respect to the dominant species. With a few exceptions, the stations studied here were characterized by high relative abundances of the polychaete Mediomastus ambiseta, followed by the less abundant polychaete Aricidea catherinae, oligochaetes, ascidians, and occasionally the polychaete Spiophanes bombyx. High abundances of Mediomastus are also found in Cape Cod Bay but are unusual for Massachusetts Bay where spionids and Aricidea predominate, although Mediomastus is generally present. Mediomastus iS an opportunist, and its occurrence on the disposal mound may suggest that the community is stressed by disturbance or organic enrichment; however, due to the relatively unpolluted condition of the disposal site this is unlikely. It is possible that a Mediomastus-dominated community is a natural phenomenon in Buzzards Bay as it is in Cape Cod Bay. Results of the REMOTS® survey indicated a Stage I community at the disposal site. The reference station Rl had a very similar infaunal community even though the station was clearly away from the disposal site. The benthic community at reference area 1 consisted of Stage I, Stage III, and Stage I on Stage III taxa (Figure 3-15). Species richness was slightly higher at the reference stations than at the disposal site stations, but both groups of stations were well within the range usually observed in soft-bottom shallow-water environments (see Blake ete wail, 1987 for Massachusetts Bay data). Total densities were similar at the disposal mound and reference stations; in comparison to other adjacent areas, such as Massachusetts Bay, the densities found in Buzzards Bay were relatively low. This may be in part a seasonal effect, because the samples were taken in March when juveniles were either not yet present or were still too small to be retained on 0.5 mm mesh. screen. Detailed information on the relative abundances of juveniles in 0.5 mm and 0.3 mm fractions of the same sample can be found in Blake et al., (1987). The assessment of the number of dominant species shared among stations revealed that the disposal site stations were very Similar. Only station 22 differed somewhat, due to the presence of molluscs and nemerteans, rather than polychaetes and oligochaetes, among the highest ranked species. Reference stations differed more from each other than the disposal site stations. This was especially true of reference area 3, where the top ranks were occupied by molluscs rather than polychaetes (except for Mediomastus). Reference area 1 was most similar to the disposal site stations, followed by reference areas 2 and 3. A relatively high similarity existed between reference area 3 and station 22. The very different character of reference area 3 is also documented in the great difference in the mean apparent RPD depth in this location as compared to the other reference areas (Figure 3-12). Results of the benthic grab analyses correlate well with results obtained from REMOTS® for infaunal successional stages, OSI, and RPD depths. aba 4.4 Sediment Chemistry and Grain Size Results of the sediment grain size analysis demonstrate a major mode of fine sand (4-2 phi) throughout most of the area. Reference area 3 contained a Class II (NERBC) level of fines (>4 phi). The distribution of material corresponded with results obtained in the REMOTS® survey and supported the interpretation of an apparent transport of fine-grained materials to the southeast. Sediment chemistry results indicated low levels of metals, pesticides, PCBs, and PAHs. Distribution of these materials was highest on stations containing greater amounts of clay and organic matter (% TOC) and lowest on those containing more than 90% sands (stations 1 and 20). The affinity for these pollutants to the colloidal material in sediment is well documented (Pequegnat et al., 1990). The levels of PAHs found were low in comparison with levels detected near the Fox Point area of Narragansett Bay (Pruell et al., 1985). Near the Fox Point area, levels of total PAHs were found in the 2-3 ppm range while, in contrast, New Bedford Harbor contained high-molecular PAH concentrations that were at least 2-3 times higher than those at Fox Point (Pruell et al., 1990). Narragansett Bay is considered to be a relatively unpolluted urban estuary while New Bedford Harbor is a highly contaminated estuary (Garnet Ee Als, tgs, 1960), 5.0 CONCLUSIONS The information obtained from the bathymetric survey and REMOTS® photos permitted the detection of two disposal mounds within the surveyed area. The primary mound was central to the disposal site, 1.2 m high and 60 m wide. The other, south and west of the center mound, was 1.6 m high and approximately 90 m wide. Currents are most likely the dominant force contributing to a bedload transport of fine-grained material from the northwest to the southeast. The sediment grain size analysis was in agreement with results obtained in the REMOTS® survey, and both sets of results corresponded with the major mode distribution found in the 1981 survey. Sediment chemistry results indicated low levels of pollutants. Although species richness was somewhat higher at the reference stations, both on-site and off-site stations were well within the range observed in soft-botton, shallow-water environments. Significant differences existed between reference stations and on-site stations in REMOTS® parameters for RPD depth, successional stages, and OSI values. Currently, the surveyed area is healthy biologically and relatively uncontaminated. Based on 12 the type’ of materials previously disposed (relatively uncontaminated sands and sands with some silt and clay), the low use of the site, and the rapid rate of recovery displayed by benthic organisms in general, these conditions are expected. Further monitoring of the site, through the DAMOS program, is suggested if increase in utilization of the site occurs. It is recommended that future physical oceanographic studies of off-site sediment transport be conducted if sediments requiring high levels of containment are proposed for disposal. 13 6.0 REFERENCES Battelle. 1987. Draft Environmental Impact Report for the identification of dredged material disposal sites in Cape Cod Bay, Massachusetts. Draft EIR submitted to the Department of Environmental Management (DEM) of the Commonwealth of Massachusetts. xi + 193 pp. + Appendices A-E. BilakeruiyA. hy Mebaptiste, sR.F. RUEL 9B. vil biog, )B. sBrown, R. Etter, and P. Nimeskern. 1987. Soft-bottom benthos of Massachusetts Bay. Marine Ecology and Water Quality Field Studies for Outfall Siting. Deer Island Secondary Treatment Facilities Plan. Report submitted to Camp Dresser and McKee, Inc. for Massachusetts Water Resources Authority, Boston, MA., pp. 109 + 2 Appendices. Blake, J.A., P. Rosen, and N. Maciolek. 1989. Benthic infaunal communities of Boston Harbor. Report prepared for the Massachusetts Water Resources Authority. 25 pp. + 11 figures + 5 tables. EPA. 1987. Test Methods for Evaluating Solid Waste. SW846. Germano, J.D., D.C. Rhoads, L.F. Boyer, C.A. Menzie, and J. Ryther, apieg alesis). REMOTS® imaging and side-scan sonar: Efficient tools for mapping seafloor topography, sediment type, bedforms, and benthic biology. In: D.Hood, A. Schoener, and K. Park [Eds.]. Oceanic Processes in Marine Pollution. R.E. Krieger Publishing Co., Malabar, Fla., pp. 39-48. Pequegnat, W.E., B.J. Galloway, and T.D. Wright. 1990. Revised Procedural Guide for Designation Surveys of Ocean Dredged Material Disposal Sites. Final Report. Technical Report D- 90-8. Prepared for the Department of the Army, US Army Corps of Engineers, Washington, D.C. PIUSIIL, Wo6to eitel wsGSs Wlbabints ~~ WOelsys Geochemistry of Organic Contaminants in Narragansett Bay Sediments. Estuarine, Coastal and Shelf Science. 21: 295-312. Pruell, R.J., C.B. Norwood, R.D. Bowen, W.S. Boothman, P.F. Rogerson, M. Hackett, Elincl Ios Butterworth. 1990. Geochemical Study of Sediment Contamination in New Bedford Harbor, Massachusetts. Marine Environmental Research. 29: 77- 101. SAIC. 1985. Standard Operating Procedure Manual for DAMOS Monitoring Activities, Volume I. DAMOS Contribution #48 (SAIC Report # SAIC-85/7516&C48). US Army Corps of Engineers, New England Division, Waltham, MA. 14 SAIC. 1989a. Buzzards Bay Disposal Site, Literature Review. DAMOS Contribution #58 (SAIC Report # SAIC-85/7516 & C48). US Army Corps of Engineers, New England Division, Waltham, MA. SAIC. 1989b. Monitoring Surveys at the New London Disposal Site, August 1985-July 1986. DAMOS Contribution #60 (SAIC Report #SAIC-86/7540&C60). U.S. Army Corps of Engineers, New England Division, Waltham, MA. IS) Auouny diys -Wweajs JayonjueN 06/9/¥ ‘pieAQulA "W - L8/te/Z ‘Q|CH SPOOM nid wyoeA JOqeH S,ually sauve | 8 SB/L1/9 seezis | essa eee s | sea pp ee s [vee _ oa ce a sae [ssa soe [visa sooee | ersa | seezis | iss S8/ee/S s8/ee/s s8/ee/S S8 nt N a w q sooes | versa | S8/02/S t-’S-d2 Awapeoy awWNWeYW ‘SSE ee Ocr | ore Olk--h 4 es : (AeID 3 HIS) spues eul4 2 | — pues jevayey # eidwes Sdul4% ; lunipayy % | asieoD % /adinos ‘06/b - SB/S Woy Sag Je Jo pasodsip jeuayew pabpaisp jo sisAjeue zis uleJD “}-} SIGE Top 10 en Species for . Benthic Sampling ae at BBDS, Barc 1990. TAXA Mediomastus ambiseta = Oligochaeta — Ascidiacea sp. (determina) Ninoe nigripes Tubulanus pellucidus Cylichnella bidentata Aricidea (Acmira) catherinae __ Cirrophorus furcatus — Turbonilla sp. Natica pusill Mediomeciis ambesta” Aricidea (Acmira) catherinae Spiophanes. bombyx Cirrophorus furcatus — ‘Tubulanus. pellucidus Oligochaeta oe Ninoe nigripes ee Ampelisca sp. iceerneete! Glycera sp. (indeterminate) | Ascidiacea s : (i indeterminate) ‘san Mediomastis ambiseta_ Oligochacta Ascidiacea sp. {i ndeterminate) Cirrophorus fuer Ninoe nigripes © Cylichnella bidentata _ Tubulanus pellucidus Aricidea (Acmira) catherinae_ Spiophanes bombyx — Cnemidocarpa mollis - Table 3-1, continued _ Top 10 Dominant Species for the Benthic Sampling ee Locations a BBDS, March aco -Ninoe rioipes ee Cirrophorus furcatus” _Tionespie (M.) perkins . Nephtys incisa__ e Spiophanes pone _ Table 31, continued Top 10 Dominant Species for the Benthic Sampling Locations at BBDS, March 1990 TAXA Se REP 1 AEP2 Mediomastus ambiseta = j.j|§§ 298 Aricidea (Acmira) catherinae : Oligochaeta Byblis serrata Cirratulidae sp. foe _Tubulanus pellucidus _ Cirrophorus furcatus Ninoe nigripes Ampelisca sp. (indeterminate) Spiophanes pomby oe TAXA = : REP 1 _REP2 Ascidiacea sp. (indeterminate) 96 154 Cirrophorus furcatus 15 128 Mediomastus ambiseta 104 8 __Ninoe nigripes _ ee a ¢. ‘Cnemidocarpa mollis ee 32 39 Cirratulidae sp. (indeterminate) 33 B20 ee Tharyx dorsobranchialis = 22 32. Oligochacta ts S 36 14 Leptocheirus pinguis- 17 32. Aricidea oe catherinae : 36 : TAXA : REP1 REP? Cylichnella bidentata —_y 135 Mediomastus ambiseta Nucula proxima Tubulanus pellucidus Scolelepis (P.) bousfi eldi Nephtys incisa Turbonilla interrupta Pitar morrhuanus Ninoe nigripes Prionospio (M.) perkinsi Table 3-2 Results of Sediment Grain Size Analysis for Buzzards Bay Disposal Site, March, 1990 Station ID Reference 1 Center Reference 1 200W Reference 2 Center Reference 2 200W Reference 3 Center Reference 3 200W Station 1 Center Station 13 Station 20 Station 22 Station 23 Station 24 Sample Description Gray, poorly graded sand with clay Medium to dark gray, clayey sand Gray, poorly graded sand with clay Medium to dark gray, clayey sand Medium to dark gray sandy, lean clay Medium to dark gray sandy, lean clay Gray, poorly graded sand with clay Light to medium gray,silty sand Light to medium poorly graded sand Medium to dark gray, clayey sand Medium to dark gray, clayey sand Medium to dark gray, clayey sand % Silt Clay *SQOd 10} pozAyeur-a1 sem $7 uoNeIS , Sad [BIOL (%) DOL DUIZ, PXIIN Ainoayy pray] Joddoy wuniwoly9 tunitupe) OL> quasly re) — TNGUE M 002 qurig MOT woneis Zeuones JOzuones _ELuones Tuoneis pou DaRIN npweed S[eJoul JO S}[nsoy -¢-¢ AGEL, Table 3-4: Percentages of Clay and Total Organic Carbon (TOC) for Buzzards Bay Disposal Site March, 1990 Station ID Reference 1 Center Reference 1 200W Reference 2 Center Reference 2 200W Reference 3 Center Reference 3 200W Station 1 Center | Station 13 Station 20 Station 22 Station 23 Station 24 @ Results of clay percentages are from eee aS data. 9°98> S18> ceol> TS2> f 66> T6tl> 6°SO-> : Jo[ydAxouapy €LI> €9Ol> 9'0c> O'sT> 8'61> 8'EC> Lae ayej[ns uej[nsopuy eLI> €9l> 9'0¢> OsT> 8'6I> 8ec> clc> apAyapye unpug vst €or 9°02 o'sT> 8'61> £87 €€e Lda-,b' €Lt> €9T> 9:0¢> O'ST> 8'6I> 8 Et> T1t> ]] UejINsopuy eLi> €9OL> 9':0¢> O'SsT> 8'61> BET> e1t> ada-,b'r €LI> e9l> 9'0t> o'st> 8'6I> B'Et> e1t> uupuy eLi> eol> 9:0¢> o'st> 8'6I> BET> c1e> uuprsid €LI> €9O> 9'0t> O'ST> 8'61> 8'Et> elt> adq-,b‘b L8> c8> €Ol> Gl> 66> 61TI> 90I> ] Uej[Nsopug L8> c8> €OI> GL> 66> 6Tl> 90I> apixoda Jo[yaeidey L8> C8> €Ol> GLl> 66> 6Tl> 90> uuply L8> C8> €Ol> gZ> 66> 6Tl> 90I> OHd-P3]9d L8> C8> €0l> GL> 66> 6 Tt> 9°0I> Jojyaeiday L8> C8> €Ool> GLl> 66> 6Tl> 90> i i OH4-P19d L8> c8> €Ol> gL> 66> ; 9°0I> (euepulT) OHd- eure ty L8> c8> €Ol> GL> 66> y 90> ; i i i i OHa-eudy (a4 0z €T DOT xg uonesS u0oneyS uonwysS uonesS wonels uoneIS Jojourered 3 T UO peseq SsuUOnDeQUSIUO) T Qaiel ‘Sad Je peysayjoo JuSuNTpes UT (q EY T QoreW Sddd Fe pa}sa]joo 7 UO poseq SUONENUSIUO7 WoulTpes UT SHivd JO SIMsoy -9-€ o[qeL aue[Aled -(1'y‘8)ozueg aus oeIYVUe -(y‘e)ozuaqiq aualhd -(po-¢'Z‘T) ouepuy] auaiXd(e)ozuag auatueIony -(q)ozuag auayUeIony -Qpozueg auasAiyy auadeIujUe(e)OZUIg aualkg austjueIONy. auaoeIWUYy aualyUeUIYd sudINoyy auayydeuasy aua[Aujydeussy auajeujden Jojomele d eu UT ,UY 8°O YQTM pezeduoo Lg6l uT ,UY 8°c SeM eore peAsaIns sUL ‘tTe jo NOO'9E LP NS¢ 9E IY NOS'9E LP oueutey WoIZ) T86T UT Sdad ey JO UOTIeIeAdASQUT UkDS-aepyts Jo sy[Nsey SJ rs) > ° Ni ol = *XaAINS O66T YOAeH * (686T °T-T eanbta MOO’? OZ MSe' lp OZ MOE Ly OZ dials a1danu AAILSYdYALNI NVOS SdIS Aeg sjpolezzng °066T YOTeW ‘Saad eYR We sasATeUe quUsUTpes pue oTYQUeq AOJ suoTAeDOT Hut{Tdwes pue suoTAedOT uUoTRIeIS eSLOWAY °*T-z ernbhya T i —— | €€ | ve ce 9€ Ze Vv Vv Y Vv Vv | | | | ze | te 0€ 62 8Z ISAMUYINOS WOOGZ of ee ag v v | 92 Vv 2 | | Vv Se Vv | €z | @ woe | ot st Zt 91 : Vv sgplessteh, fe aly pemackposimch, fomash beseech 2 Vv vi | s+ Yt | , eS ee as) | i | Vv | Z 8 & Ol it | Vv Vv v Vv Vv V NOOZ ISOMYLION UWZOLE | SUOI}JEDO7] UOI}EIS Buijdwes JUSWIPSS Y VJIYJUSG suonels Buljdwies juauwipas 9 jeune o1ujUeg ‘SLOWSH = W pue SUOI}eD07 UOlTEIS agp uOmels SLONH = ¥ | Aeg splezzng NOOO"SE th MOOS "Ob 020 -|- HOOS*Or 020 | °O66T YOAeW ‘SdHA JO RAeYO OTAAeUAYQeq peazanojuos9 *T-€ eanbya HOSL"OP 020 | HO00"tr 020 ee ne Hose" th OZ0 a= MOOS" tr O20 $4339 OSE O0E 0S5e O0c OSt 00} 05 0 es cs ee 2] | NOSZ*SE bb aL 06/€ AVG SGYVZZNA ll °066T YOAeW ‘SaGaq 1OJ epow AzOCew ezTs uTeAb Jo uoTANnqTAzAsSTa °Z-€ eanbta pues euly Ala, €-p = (swUuf-!Ud) pues eul4 Ae, AbD WIS €-¥ < = pues eul4 2-6 = apo Jofeyy 8ZIS ules Aeousy<= —— pues wnipey |-z = oe Aeg splezzng Figure 3-3. A REMOTS® photograph from BBDS reference area 1. rence area 3 d material ine-gralne showing an ambient bottom of f A REMOTS® photograph from BBDS refe and a Stage III assemblage. Figure 3-4. Figure 3-5. A REMOTS® photograph of rippled sandy bottom at the BBDS center. Successional stage is indeterminate. A REMOTS® photograph from BBDS reference area showing the superposition of sand over mud. Figure 3-7. A REMOTS® photograph from BBDS station 19 which had a surface layer of mud over sand related to the presence of dredged material. Figure 3-8. A REMOTS® photograph from BBDS stations 17 and 32 showing the deposition of sand over mud possibly related to disposal events. . Buzzards Bay Disposal Site Station Frequency Distribution KEY RANGE OF VALUES (CM) 0.0 - 0.6 0.6 - 1.0 1.0-1.4 1.4-1.8 1.8-2.2 2.2 - 2.6 2.6 - 3.0 3.0 - 3.4 3.4 -3.8 3.8 - 4.2 4.2-4.6 25 CLASS INTERVAL 20 Frequency =a = = aoOoqo Manon aD — 10 5 O 1 2). 8) A PO NOs aero Our Sae AO a at Boundary Roughness Class Interval Figure 3-9. Frequency distribution of small-scale surface boundary roughness for disposal stations at BBDS, March 1990. 30 25 20 15 Frequency 10 Figure 3-10. Buzzards Bay Reference Station Frequency Distribution KEY RANGE OF VALUES (CM) 0.0 - 0.6 0.6 - 1.0 1.0 - 1.4 1.4-1.8 1.8-2.2 2.2 - 2.6 2.6 - 3.0 3.0 - 3.4 3.4 -3.8 3.8 - 4.2 4.2-46 CLASS INTERVAL bh ok =o @oonvrowsrkh ®N — SPOON eae CeO Grimm aren Oh agit Boundary Roughness Class Interval Frequency distribution of small-scale surface boundary roughness for reference stations at BBDS, March 1990. “O66 YOAeW ‘SGad Ze TeTIejZeEU pebperAp Jo uofAnqTAASTG °TTI-€ eanbyta M000" FP 020 MOOS "TP 020 $Ja}a4 Ose O0€ 0Se O0c OGF 00} O O SS | : NOSZ*SE bh v + _ _06/€ AVE SGYVZZNaA M00S "Oh 020 HOSZ"OF 020 HO00"tr 020 muse ty 020 = | aol ee leg el Ieee L °066T YOAePW ‘Sdad 10Z SUQdep ddy ZUeAedde ueoM °zZT-E eANnbtd a) a = cy 2 = 3 3 (wd) yideqg dH UBS Wd} = JeAIO}U] INOJUOD GdH ia Neg sjpvezzng 30 Buzzards Bay Reference Station Frequency Distribution che N=24 1 N29 240 5. (Ge 7. 8 HOO 12 Mean RPD Depth (cm) 30 Buzzards Bay Disposal Site Stations Frequency Distributions 25 N=57 N (o) Frequency a 10 123 4 5 6 7 8 9 10 11 12 Mean RPD Depth (cm) Figure 3-13. Frequency distributions for mean apparent RPD depths for on-site and off-site locations at BBDS, March 1990. Figure 3-14. A REMOTS® photograph showing lower optical reflectance at depth due to the spring plankton bloon. °066T YOITRN ‘SGA IOJ SOTeS TeUOTSSeDONS TeuNeJUT JO uoTANQTAASTp TeTIeds eUL *GT-€ eanbyg UOHIN!S|q feyayeyy peBpaig sywjeg unoyuoy ------- eyeulWJ9}Epu| = w Aug 1 ebasS = 7 AW JO seauy WWI|ag SunoJUOQ ~ ——— € efe}s 40/pue ¢ uO | ebeyS ebels JEUOISSBOONS Jeuneju| YUM UONeUIqUIOD | | eBeIg = O € uo | eBeIg J0/pue ¢ ebeIS = @ Ai eg S—plezZzng MOOL' bY 02 M002 by OL = seBe}sS sews "066T YOIeW ‘SGHA AOJ sanTeA Xepul Auewytpes wstuebazo auL °9T-€ eaznbta GOUGIBJOY -8}0N) 08 v | | ” eae | 2-434 VS | Olly ‘ “ al | i Olly ‘ [eee | OLL OFF OFF Ip Vv Vv Vv Vey | ! | Obl OFF ae] Vv Vou | V ot 2s | Wie | | Nt) | | pS ey ) v Vv y Vv | Vv | 3 3 a rl 8 R | ca 2 a a i a 8. 2 8 = = = = uONNquisiq jeueyeW pebpaig swag INoJUOD --------- dieaerad ial INAWIGAS-WSINVOYO NVA 9+ > SSO Wujeq siInNoJUOD =——— ree Aeg splezzng Buzzards Bay Reference Stations =e Frequency Distributions Frequency 123 45 67 8 9 1011 Organism-Sediment Index Value ae Buzzards Bay Disposal Site Station Frequency Distribution 25 =45 = 20 S 5 w 45 10 5 1234567 8 9 1011 Organism-Sediment Index Value Figure 3-17. Frequency distribution of OSI values for on-site and off-site locations at BBDS, March 1990. "066 YOARPW ‘Saag A0J sesATeue VzTs ufeibh Aueutpaes “ST-€ ernbTa USvJ OL LSIM WOH CGIONVUUY SNOILVLS) M€iaau D9E435Y [74 ce 02 oF) ve eb Meday¥ 0253540 MisdaY 91535 0 spues winjpey ay spues eu|4 Le Na ms Z| 0€ Ov 0s : 09 Cae gy Aejo-us = iV OL 08 06 LNIOYFd APPENDIX A STUDY SITE BUZZARDS BAY vi aa ah (ae)! i! Wh Bk gees ies ricre ies ae 4 ff i" yeaah waa -_sTupY SIE = ‘BUZZARDS BAY STATION = 1 _ COLLECTION DATE = - MARCH 1990 AXA - Total individuals, so = oe 9% OF TOTAL : niltides Shei) catherines th crops | furcatus NINETY PERCENT BREAKPOINT — . Scolelepis (P.) bousfieldi_ Nassarius trivittatus _ Cirratulidae sp. (indeterminate) _ Notomastus spp. inesteuninats) Brania wellfleetensis —_—/ of urbonilla interrupta - Ampharetidae (Matinina) 9 sp. = lee a ee — . a 3) a 2) | se | | A | : te i 1 Seg A” a a Exogone dispar ‘Cnemidocarpa mollis TOTAL NUMBER OF TAXA TOTAL NUMBER OF INDIVIDUALS Aricidea (Acmira) catherinae Spiophanes bombyx Cirrophorus furcatus Nassarius: ites Lumbrineridae sp. (indeterminate) : Ampharetidae Cae) Brania oo a Polynoidae sp. (indeterminate) Turbonilla sp. (indeterminate) Lumbrineris acicularum Se Tharyx acutus : Oxyurostylis smithi Ampharetidae Win) sp Sphaerosyllis taylori — Nereis grayi ae Cirratulidae sp. (indeterminate) Byblis serrata ts Nephtyidae. s Glycera american Exogone dispar ‘Astyris lJunata ee Cylichnella bidentata Spiochaetopterus costarum A-2 _sTuDY SITE = _ BUZZARDS BAY OLLECTION DATE = MARC 1990 a (continued . ee TOTAL NUMBER OF INDIVIDUALS - Oligochaeta _ oe Ascidiacea sp. (indeterminate) _ Cirrophorus. furcatus — Ninoe nigripes © -Cylichnella bidentate ‘Tubulanus: pellucid Aricidea (Acmira) catherinae _ Spiophanes bombyx _ Cnemidocarpa mollis — Ampelisca sp. ndeterrninate) Lumbrineridae sp. (determinate) e Brania eae Nicolea zostericola. Cerastoderma pinnulatum _ Polynoidae sp. (indeterminate) Maldanidae sp. (indeterminate) _ oe yllis taylor os ‘NINETY PERCENT BREAKPOINT Resear us inialus” Acteocina canaliculata Dorvilleidae sp. AD Ciripedia . Tharyx dorsobranchialis _ Ampelisca verrili Paracaprella tenuis _ _ STUDY SITE = BUZZAS BAY _ COLLECTION DATE = = MARCH 1990 “TOTAL NUMBER OF TAXA. TOTAL NUMBER OF INDIVIDUALS A-5 ; Mediomastus amt iseta Tubulanus. pellucidus Scolelepis oO bousfieldi_ Ascidiacea Sp. (i Ninoe higripes: Prionospio (M.) one i ‘Acteocina (aera) eaten aryx a : Natica pusilla Astyris lunata © Nassarius triv ittatus Yoldia limatu Tellina agilis ae Pandora sp. (ndetrminate) Sipuncula : Owenia fusiformis Ampharetidae (Melinninae) sp. R Jom NUMBER C OF INDIVIDUALS : A-7 Pandora ‘sp. ( ) Glycera sp. (indeterminate) _ _ Gammarus annulatus — _ Ampharetidae (Melinninae) sp. es Ampharetidae sone) 4 =e S Phyllodoce arenae ae ] A-8 ‘STUDY SITE = _ BUZZARDS BAY ‘Mediomsstus S fecdiacca sp. fine tert _Glrophorus fureatus : a8 Spiophanes. bombyx __ Ampelisca sp. {indete _ Cirratulidae sp. Ancsterminate) oe _ Scolelepis (P.) bousfieldi _ : Sphesrosyils yer -_Glycinde solitaria S _ Spiochaetopterus costarum Glyceraamericana _ Braniawelifieetensis —_—/ Polynoidae : sp. (indeterminate) Pherusa sp. onl _Scalibregma inflatum | Notomastus luridus Amphiporus biocul 5 Anemone sp.A © Levinsenia gracilis -Parougia caeca ne Owenia fusiformis Melinna maculata © A-10 Phyllodoce arenae _ Cnemidocarpa mollis - . Mediomastus ambiseta_ na) catherinae Notomastus spp. *inleterminate) Ampharetidae Usnphatane) sp. _ Pitar morrhuanu ‘Pinnixa ‘Sp. {indete minate) Nepriyices © Sp. (it Beta) o. 4. 0 . "NINETY PERCENT BREAKPOINT Vitrine idae. p. SE Cylichnella bidentata os Glycera americana _ Ampelisca vadorum — Polynoidae sp. SGadetecninets) Lumbrineridae sp. (indeter.) Turbonilla sp. (indeterminate) _ ‘Cerastoderma pe ae Tellina agilis Lumbrineris. acicularum : Scolelepis (P.) bousfi eldi Nephtys picia Unciola irrorata — Owenia fusiformis ae Amiphiporis bioculatus : (Conoco cc us oF A-12 Nucula coins Caulleriella cf. killariensis ee -Polycirrus s sp. (i ndeterminate) robgordis sp. _ Microphthalmus 2 (indte) Astyris lunata eyes elongata ee 1 0... 0 0 al 2 ae ) : 2 | ce 0 0 0. 0 =O od a =e l OFTAXA —— 80 MEAN NUMBER OF INDIVIDUALS 025 S A-14 _ STUDY SITE = - BUZZARDS BAY : ‘STATION=R2 COLLECTION DATE = MARCH 1990 TAXA- Mean Total individuals 788.5 REP 1 REP2 MEAN % OF TOTAL a Ginophons foes . 128 _ Mediomastus ambiseta_ 10 84 Ninoenigripes ss 74 7 __ Cnemidocarpa mollis — oe a9 Cirratulidae sp. feces) 82 _ Tharyx dorsobranchialis = = 22 82 ‘Oligochacta . ex! 14 __Leptocheirus pinguis _ ’ _ Asicidea (Acmira) catherinae __ Cylichnella bidentata . Thayxacutis Ampelisca sp. (indeterminate) Tubulanus pellucidus Pitar morrhuanus — Nephtys incisa _ Brania wellfieetensis Brania clavata _ Scalibregma inflatum ‘Lumbrineridae sp. Tingctrninctey Scolelepis (P.) bousfieidi Maldanidae sp. (indeterminate) — Polycirrus sp. (indeterminate) Nucula delphinodonta Pinnixa sp. (indeterminate) _Sphaerosyllis taylori Natica pusilla Wonk eow8 2 os NINETY PERCENT BREAKPOINT ee Macoma tenta = Oxyurostylis smithi Turbonilla sp. — : Nereis grayi Aripharetilas (Ampharetinee) sp. Nassarius trivittatus O=NNYAUAO EW DhORONUAAD A-15 p. (indeterminate) Ampharetidae (Melinninae) SP. Ceriantheopsis americanus — Amphiporus bioculatus : Carazziella hobsonae ~~ Spp. gndeterninate) . -Tellinidae sp. ee - Turtonia minuta aS -Parougia caeca Turbonilla stricta Cyclaspis varian -Ptilanthura tenuis oe _ Lumbrineris acicularum : Ampelisca vadorum __ Terebellidae s (indeterminate) Polygordius sp. Dorvilleidaesp.A es _Unciola sp. (i indeterminate) Callianassa setimanus __ - Acteon’ punctostriatus. Polydora socialis — Saccoglossus kowalevskii Pherusa sp. (indeterminate) a .rrrr—“—i—OCOCOSCSC—C—C—C—C*C=iéisCON A-16 oe STATION STATISTICS ‘TOTAL NUMBER OF TAXA —s 80 "MEAN NUMBER OF INDIVIDUALS 788.5 A-17 _sTUDY SITE = BUZZARDS BAY | STATON= FS _ couiscnd DATE = MARCH 1990 TAA- Mean n Total individuals, 721 : Cylichnella bidentes _ Mediomastus ambiseta_ = Nucula proxima — = Tubulanus pellucidus S Scolelepis (P.) bousfi eldi Turbonilla interrup Pitar morrhuanus ~ - Ninoe nigripes S Prionospio (M.) perkinei _Maldanidae oP (indeterminate) Oligochasta _ = Cirrophorus fcaie ae Levinsenia gracilis Astyrislunata ts Turbonilla sp. (indeterminate) Macoma tenia — : Ascidiacea Sp. (indeterminate) Nephtyidae sp. (indeterminate) Nuculanidae sp. theta) vgs limatula es RNA OROM“NVNN-O-0 NINETY PERCENT BRE Hutchinconisla macracantha Luconacia incerta Carazziella hobsonse : Ampelisca sp. inao ene ae Nereis grayi Polynoidae sp. (indeterminate) Acteon punctostriatus _ Flabelligeridae sp. (indeter.) Phoronis sp. - = Glycera americana _ Mulinia lateralis Parougiacaeca Lyonsia hyalina _ Brania clavata © 0 hee Neo eo COLLECTION DATE = = MARCH 1 1900 oo : es % OF TOTAL _ 0.28 0.28 0.28 0.28 — 0.21 0.21 0.14 0.14 0.14 0.14 0.14. 0.14 0.14 0.07 0.07 0.07 0.07 0.07 0.07 0.07 0.07 ehoy gee 0.07 0.07 0.07 0.07 | 0.07 0.07 0.07 0.07 0.07 — 0.07 0.07 a Ceriantheopsis a americanus _ Ericthonius: brasiliensis _ Natica pusilla oe ae Saccoglossus kowalevskil _ Acteocina canaliculata _ _ Pinnixa sp. {indeterminate) Gerastoderma pone _Tellina agilis _ ee _ Autolytus cf. fasiatus ____ Sphaerosyllis taylori _ __Unciola sp. (indeterminate) Parametopella vere Pinnixa ‘sayana — ae 344+ A~NONNN==~ONONOA — Pectinaria sp. “Gr ndeterminate)_ Aoridae sp. (indeterminate) _ _ Batea catharinensis _ Pinnotheridae sp. (ccemnag -Lumbrineridae sp. (indeterminate) Pinnixa chaetopterana Odostomia ct. engonia : Sipuncula — L Anemone sp. A _ Nemertinea sp. A Syllidae sp. (indeterminate) Se Bostrichobranchus pias O2+=C90O00H-0+=-+=4=00=04=-A000NTD00==0-4-NH0. . TOTAL NUMBER OFTAXA sis TOTAL NUMBER OF INDIVIDUALS - 514 TOTAL st ATION ST. ATISTICS TOTAL NUMBER OF TAXA 9 MEAN NUMBER OF INDIVIDUALS —_727.0 A-19 PRUE Nie aA MP nts precast g mma Ee ey E ‘4 APPENDIX B COMPREHENSIVE LIST OF MACROBENTHIC INVERTEBRATES COLLECTED FROM BUZZARDS BAY STUDY SITE \ i : ‘ i an i i ‘ 7 Whee ae Mel ad Ey ae TeAPSY ‘i x eae ed Kee, ll F wi pak i, Y Bi Cem. Ae : ee" 4 } ay 1 a: Maa Wales ge RRR ele fe aes Blt, Bs ie i. { nig vy ‘ j : : ' i eee AG vie: \ Riel iS AP tas Pail i pare 3 i 3 ri falter - “2 ‘y i . HOE ail ; i | } f yh 4 1 i fe Ue ii ay 1 hi ie pa te ny) ie H st L a BAIR ie ; Ay a vn Re re cay a a y iy i ia yon ei tt aoe APPENDIX B COMPREHESIVE LIST OF MACROBENTHIC INVERTEBRATES COLLECTED FROM BUZZARDS BAY STUDY SITE Identifications Performed by Cove Corporation May 1990 P. Cnidaria C. Anthozoa F. Cerianthidae Ceriantheopsis americanus F. Edwardsiidae Edwardsia sp. Anemone sp. A P. Nemertinea F. Amphiporidae Amphiporus bioculatus F. Tubulanidae Tubulanus pellucidus Nemertinea sp. A Nemertinea sp. B Nemertinea sp. C P. Platyhelminthes C. Turbellaria F. Stylochidae Stylochus ellipticus P. Annelida C. Oligochaeta Oligochaeta C. Polychaeta F. Ampharetidae Ampharete sp. (indeterminate) Melinna maculata Ampharetidae (Ampharetinae) sp. Ampharetidae (Melinninae) sp. _F. Arabellidae Arabella mutans Drilonereis longa Notocirrus spiniferus B-1 COMP. LIST OF MACROBENTHIC INVERTEBRATES ( CONTINUED ) . Capitellidae Mediomastus ambiseta Notomastus luridus Notomastus spp. (indeterminate) . Chaetopteridae Chaetopterus variopedatus Spiochaetopterus costatum . Cirratulidae Caulleriella cf. killariensis Tharyx acutus Tharyx dorsobranchialis Cirratulidae sp. (indeterminate) . Dorvilleidae Dorvilleidae sp. A Parougia caeca . Eunicidae Eunicidae sp. (indeterminate) . Flabelligeridae Pherusa affinis Pherusa sp. (indeterminate) Flabelligeridae sp. (indeterminate) . Glyceridae Glycera americana Glycera sp. (indeterminate) . Goniadidae Glycinde solitaria . Hesionidae Microphthalmus sp. (indeterminate) . Lumbrineridae Lumbrineris acicularum Ninoe nigripes Lumbrineridae sp. (indeterminate) . Maldanidae Asychis elongata Maldanidae sp. (indeterminate) . Nephtyidae Nephtys incisa Nephtys picta Nephtyidae sp. (indeterminate) B-2 COMP.LIST OF MACROBENTHIC INVERTEBRATES ( CONTINUED ) . Nereididae Nereis grayi . Orbiniidae Leitoscoloplos sp. (indeterminate) . Oweniidae Owenia fusiformis . Paraonidae Aricidea (Acmira) catherinae Cirrophorus furcatus Levinsenia gracilis . Pectinariidae Pectinaria sp. (indeterminate) . Phyllodocidae Phyllodoce arenae . Pilargidae Cabira incerta . Polygordiidae Polygordius sp. . Polynoidae Polynoidae sp. (indeterminate) . Scalibregmatidae Scalibregma inflatum . Serpulidae Hydroides dianthus . Spionidae Carazziella hobsonae Polydora socialis Prionospio (Minuspio) perkinsi Prionospio (Prionospio) heterobranchia Scolelepis (Parascolelepis) bousfieldi Spio sp. (indeterminate) Spiophanes bombyx Autolytus cf. fasciatus Brania clavata Brania wellfleetensis Exogone dispar Odontosyllis fulgurans Sphaerosyllis taylori Typosyllis sp. 1 (NMFS) Syllidae sp. (indeterminate) Syllidae (epitoke) B-3 Iso P. Mollusca COMP. LIST OF MACROBENTHIC INVERTEBRATES ( CONTINUED ) Terebellidae Nicolea zostericola Pista palmata Polycirrus sp. (indeterminate) Terebellidae sp. (indeterminate) C. Bivalvia F. F. Arcidae Anadara transversa Carditidae Cerastoderma pinnulatum Laevicardium mortoni Pythinella cuneata Lyonsia hyalina . Leptonidae . Lyonsiidae . Mactridae Mulinia lateralis . Nuculanidae Nuculanidae sp. (indeterminate) Yoldia limatula . Nuculidae Nucula delphinodonta Nucula proxima . Pandoridae Pandora sp. (indeterminate) . Solecurtidae Tagelus divisus . Solenidae Ensis directus . Tellinidae Macoma tenta Tellina agilis Tellinidae sp. (indeterminate) . Turtonidae Turtonia minuta . Veneridae Pitar morrhuanus B-4 COMP. LIST OF MACROBENTHIC INVERTEBRATES ( CONTINUED ) C. Gastropoda F. Acteocinidae Acteocina canaliculata F. Acteonidae Acteon punctostriatus F. Crepidulidae Crepidula sp. (indeterminate) Crepidula plana . Columbellidae cf. Columbellidae sp. (indeterminate) Astyris lunata . Cylindrobullidae Cylichnella bidentata . Nassariidae Nassarius trivittatus . Naticidae Natica pusilla . Pyramidellidae Odostomia cf. engonia Odostomia cf. gibbosa Turbonilla interrupta Turbonilla stricta Turbonilla sp. (indeterminate) . Turridae Turridae sp. (indeterminate) . Vitrinellidae Vitrinellidae sp. A P. Arthropoda Sub __—~P..- Chelicerata C. Pycnogonida F. Phoxichilidiidae Anoplodactylus lentus . Crustacea . Cephalocarida Hutchinsoniella macracantha . Cirripedia Cirripedia . Malacostraca O. Amphipoda COMP. LIST OF MACROBENTHIC INVERTEBRATES ( CONTINUED ) . Ampeliscidae Ampelisca vadorum Ampelisca verrilli Ampelisca sp. (indeterminate) Byblis serrata . Aoridae Aoridae sp. (indeterminate) Leptocheirus pinguis Unciola irrorata Unciola sp. (indeterminate) . Bateidae Batea catharinensis . Caprellidae Luconacia incerta Paracaprella tenuis . Gammaridae Gammarus annulatus . Ischyroceridae Ericthonius brasiliensis . Liljeborgiidae Idunella barnardi F. Phoxocephalidae Phoxocephalus holbolli F. Stenothoidae Parametopella cypris O. Cumacea F. Bodotriidae Cyclaspis varians F. Diastylidae Oxyurostylis smithi O. Isopoda F. Anthuridae Ptilanthura tenuis F. Idoteidae Edotea triloba O. Decapoda Infra O. Anomura F. Callianassidae Callianassa setimanus (=C. atlantica) B-6 COMP. LIST OF MACROBENTHIC INVERTEBRATES ( CONTINUED ) . Paguridae Pagurus sp. . Porcellanidae Polyonyx gibbesi . Upogebiidae Upogebia affinis . Brachyura . Pinnotheridae Pinnixa chaetopterana Pinnixa sayana Pinnixa sp. (indeterminate) Pinnotheridae sp. (indeterminate) . Sipuncula Sipuncula . Phoronida F. Phoronidae Phoronis architecta . Echinodermata C. Ophiuroidea Ophiuroidea sp. . Hemichordata C. Enteropneusta F. Harrimanidae Saccoglossus kowalewskii P. Chordata Sub. P. Urochordata C. Ascidiacea F. Molgulidae Bostrichobranchus pilularis F. Styelidae Cnemidocarpa mollis Ascidiacea sp. (indeterminate) Wer ieee mane Ue ues Ne ie hs a Si G28} one io BUZZARDS BAY DISPOSAL SITE BASELINE STUDY MARCH 1990 benthos 2, 3, 6-8, 10, 11, 13 deposit feeder 2 macro- 3, 8 Nephtys sp. 8 Nucula sp. 7 polychaete 2, 7, 11 bioturbation 5, 10 body burden 3, 8 boundary roughness 4, 5 contaminant 13 CTD meter 2 currents 2, 12 density 7 detritus 6 disposal site Buzzards Bay (Cleveland Ledge) 1, 4, 5, 11, 14 New London 14 Western Long Island Sound (WLIS) 14 Grainesize) 2, 4/75, (8-10, 12 habitat 10 New England River Basin Classification (NERBC) 8, 9, 12 organics polyaromatic hydrocarbon (PAH) 4, 9, 12 polychlorinated biphenyl (PCB) 4, 8, 9, 12 total organic carbon 4, 9 recolonization 3 recruitment 6 reference station 2, 5-8, 11, 12 REMOTS 1-6, 8-13 boundary roughness 4, 5 Organism-Sediment Index (OSI) 6, 7, 10-12 redox potential discontinuity (RPD) 5, 6, 10-12 salinity 2 sediment chemistry 2, 8, 9, 12 clay 1, 4, 8, 9, 12, 13 gravel 5 sand 1, 4, 5, 8-10, 12, 13 Sail, ae Ce Gh) a transport 4, 9, 10, 13 sediment sampling 2 cores 3, 4 grabs 3, 11 shore station 2 Ssidescan sonar 1, 10, 13 species dominance 8, 11, 12 richness 11, 12 BUZZARDS BAY DISPOSAL SITE BASELINE STUDY MARCH 1990 (Continued) statistical testing 10 Mann-Whitney U-test 5, 7 stratigraphy 4 succession pioneer stage 2 seres 6, 10 successional stage 2, 6, 10-12 survey baseline 1, 3 bathymetry 2-5, 9, 12 temperature 2 tide 2, 3 topography 3, 4, 10, 13 trace metals 4, 8, 9, 12 arsenic (As) 4, 9 cadmium (Cd) 4, 9 chromium (Cr) 4, 9 o copper (Cu) 4, 9 mercury (Hg) 4, 9 nickel (Ni) 4, 9 Zaney (2m) 49 waste 13 waves 1, 10 LP Na Gee: G up