WRwosS ) Sore, Cs MAY 1979 DAMOS DISPOSAL AREA MONITORING SYSTEM ANNUAL DATA REPORT - 1978 SUPPLEMENT C ISLE OF SHOALS DISPOSAL SITE Naval Underwater Systems Center Newport, Rhode Island wHo| Meee )\ DOCUMEN ! COLLECTION New England Division Corps of Engineers oF cant Waltham, Massachusetts (S4 ay May 1979 vt ONAN 0 0301 0038839 3 DAMOS DISPOSAL AREA MONITORING SYSTEM ANNUAL DATA REPORT - 1978 SUPPLEMENT C SITE REPORT - ISLE OF SHOALS Naval Underwater Systems Center Newport, Rhode Island New England Division Corps of Engineers Waltham, Massachusetts May 1979 oF o 99 ° o h4 ofS t= nsooy Joyouy Oo Ty | a = \ R Se[qo7j 2 Ne punes is ASUS puo[ey r) UOpUC 7 Sao7 ee Bu04 uN jeey MON U1EASEM Lil NN ucqueg 7 —— dzyeqyuby4 ucys0g r) punoug jne, fs uc zseog @2 ces of = @ [BOYS Jo ST ST SINCE A/ SIO SLU WSLSAS INIYOLINOW ek eee vay IvSOdSId = nr‘ 9 = ff pup Tyooy yo Be DISPOSAL AREA MONITORING SYSTEM This is one of a series of site specific data reports resulting from the DAMOS program, now two years in progress. DAMOS is the culmination of nearly a decade of prior study efforts, actually preceding NEPA, which have been directed towards the understanding of the effects of and the responsible management of the ocean disposal of dredged materials in New England waters as they fall under the authority ot the New England. Division of the Corps of Engineers. The individual site reports hence- forth will be updated approximately on an annual bases as additional knowledge is gained, at least with respect to those sites where signifi- cant disposal activities will have occurred. ISLES OF SHOALS The actual location of the Isles of Shoals disposal site that could be used aS a regional dumping ground has not been officially designated. A large dumpine ground (Fig. C-1) between 1 and 3 miles east of the Isles of Shoals has Deen used in the past for a small amount of dredge spoil from the Portsmouth - Kittery area. The bottom is largely rocky but is penetrated by several valleys containing soft sediment. Previous dumping was not specific to areas within the site and the location of spoil is not known. No effects of spoil have been re- Ported, however, there are many metal racks on the seafloor which have been jeti- soned from aircraft using jet assisted takeoff (JATO) from Pease Air Force Base. Selection of a disposal point within this historical site has been under- taken by the DAMOS program to provide baseline data should dredging in the Piscataqua River be required in the future. The actual space needéd for "point dumping" of spoil is probably % x % mile but a 1 x 1 mile site will be estab- lished, The site chosen for study of currents and fisheries is a valley on the east side of the large dumping ground, Bathymetry Navigation for surveys in the Isle of Shoals area was provided by trisponder Stations at a surveyed site in York, Maine and at Newburyport Light. Side scan and subbottom data indicate that the disposal area is composed of outcrops of basement rock, amd flat areas covered by a soft acoustically transparent mud . The first bathymetric survey of the site in Necember, 1977 (Fig. C-2(a-g)) indicated a flat, soft area would be present on the eastern edge of the disposal ea ine mai anc) epoca Bly Pe ee ol ee eee ee eee mR ®*24uyL® ®R*A2MR? aRN*®2% LSVeepe SHOALS DUCK 1 ae ae ag’ ae APPLEDORE 1 2 ea TNO LUNGING 1Q QO cEDAR 1. STAR 1. WHITE 1. {SLES OF SHOALS ae | B° . @sreal —= r=?) GES ase Bee ON ilies G cos ae Se se ; Ne Dall sets FRY le pon ~. 1 GE A) aoe ‘te BS os a ae pc Ca zt a oveoe WW \" ies es a Tak Vesela Rp I, re a SINIAI CH) xX ASyaz aas2 @S22z AnaeZ MSZ! aas! 4s5z! 4a!) OSL 4as asz 4 a ee E JANU7 CW) X WSVLE ABSZ 4s2e2 4na2 ASL! Bos! 4321 400! 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AWW SqIvuUHS 30 ANSI! %, as2 AasSzZ EZ 3Wwt : - CW): X ms/Z Base woszz2 waa2z -OSL!I BoUs!. @aszZ! wag BSL nas Sh eee { leer SS = Ph sane Vel AeA ALY bella Ay Bee Behe re 22 aid CW) xX wst2 Basz BszZ2 BaaZz BSL) ous! Bsz! Bagi BSL nas fees cs ore lf pp ee a —_— $$ + - SRA LN aan al Ane AN aap pasties lees Sriyd CW) X masL/2 @usz @szz2 wane BSL! agsi Bszi waa BSL aas i ee eS a a : oat RAK tart XEE' S@ NOILHYS9SYXS THD! LYNAA WOS!|'THANSLNI ANH BLE! “BI AUHW SIHOHS 30 37151 site. The second survey in May, 1978 (Fig.C-3 (a-g) was relocated eastward to examinethis location and it was found that the area would be an excellent location for a disposal site as the lithology would be similar to spoils dredged from the Portsmouth harbor. The most likely location for a disposal Point would be in a small valley between two outcrops at a depth of 78 m. The presence of the outcrops would discourage dragging and the criteria of similar lithologies would be satisfied. Further work to define this disposal site will be accomplished in the near future. Currents No current measurements have been made at the Isles of Shoals site since the actual disposal area has not been defined. Sediments Heavy metal analysis of sediments from the Isles of Shoals site and the Pescataqua River are presented in Table C-1. These data fit the iron/metal model reasonably well. The samples from the disposal site are typical of un- spoiled areas while those from the river are enriched in metals relative to iron. Such a situation would contribute to ane monitoring of spoils should disposal occur, Biochemical Studies A mussel cage has not been placed in the disposal area because no specific site has yet been determined, however, a reference station was established on the eastern side of Smuttynose Island and was sampled beginning on August 21, 1977. M. modiolus from this station appear to show the greatest quantitative changes compared to baseline data of all the northern New England sites. As OT Sq ATdya[nw sentea ef TTVx 7 SI S ST eT S val € L S 6 SZ 4 XOwds TFu 8°8 76 LY 14 ee ° GA* 92 19 8°S S?° eseq CI-aNdd TFu Tes GG €€1 Le 0c 8° OS? 07 9°83 9¢° aqddd TFu | 9°Ol 07 7€ EX O£* 8S° 7°8 61 GY O°T GadI- ud Tru yy CLE OST 92 BY) I°l 08 09 9°9 St?" eseq 94-Sddd G Wb LY st Gc 0SO0° c‘T €°8 €v €°8 TE* € SI Ts TS 0Y €1 SC LFO° 9°T ell Ov £°8 6S° é SI Ca GS LE ST 0¢ 090° (om 9°9 9¢ o°L G7 1 SI 8Z61 AVN el x (wdd) (%) mda sTejou LIV ese3i9/TIO TOS/TOA UZ qd IN 3H ¥24 no 49 09 PO ONT IdNVS MAALY WNOVLVOSId ¥ STVOHS JO SHISI SISATVNV LNHYNIGES dOVaAdNS T-0 ATaVL nO 00:€€002 u0° 00, 8S0et : , i a 8161/98 LL6 1/296) n0° St. £002 | n0°0S 1,892 8/6 1/280, asouA}4nWs 86 L/ony JOq4ey 100, 9€002 Al GE, 2€00L ya Nouisy4od 1001 69020 u6°£216S0e0 B16 L/ API / “savuy | s3903u0 ———T Sgyud | sadqaqu0 | | YalaW eee SJIdWWS JIHLNIG - §13SSNW SI1dWVS JIHLNIS S73SS0N IN3uUND 31v0 JLIS JONIYIIIY 2311S WSOdS1G “HON “SLeoys sO ALSI =F 3ALTS SNOILWIOI J1dWYS RI-9 JTL Isle of Shoals May '78 ® Dredge Dec '78 @ Dredge #1 en beci. 78 Dredge #2 ® Benthic Samples C- Ib can be seen from Table C-2 and Figure C-4 the concentrations of Cd, Cu, Hg, Zn, and Fe lie conspicuously outside the upper 95% conficence limit of the baseline data, Only the concentration of Cd remains within the 95% confidence limits. The location of this reference site may be subject to change unless a viable explanation for the significant changes in metal concentration can be explained, Benthic Macrofauna Table C-3 presents the numeric density data for the major species obtained at the Isles of Shoals disposal area during December, 1977. A fairly diverse population with 14 major species comprising 77% of the total number of indi- viduals was found in this area. Fisheries There are a number of regulations which effect the pattern of fisheries in this area. The marine boundries of Maine and New Hampshire have not been established beyond the Isles of Shoals. Two possible borders are shown on Fig. C-5;: a median line between Cedar Island Ledge and Anderson Ledge, and a line due east of the ledges. The study site is 1% and 1 miles from these lines and in Maine water. The definition of these borders is important because Maine and New Hampshire waters can be used for lobstering only by residents of each state. Dragging can be done in non-home states with a licence, but dragging can not be done within 2 miles of New Hampshire. In addition to these regula- tions, there is a tradition of only Isles of Shoals - connected fishermen lobstering with 2 miles of the Maine islands. =\.3 ¢ C-2, HEAVY METAL CONCENTRATIONS (PPM) IN MopjoLUS MODIOLUS FROM ISLES OF SHOALS (NORTHERN New ENGLAND). DATE LOCATION Cb CR Cu He PB ZN Fe Badl=y7 \slesvog SHOALS x 8,688 185 32527-50262 214,89 218 98 Sih Sal) 78 8.68 0.059 2,53 LG ii 5-19-78 KZ Oa 2 054) 55.950 0925) 19572 ee Se 208 Sih SoZ0 hal Wes) LO lay IBS 48 8-5-78 X 30.65 1.9 57.33 0.405 19.22 46l li4 Sy ey Oe G7 poxeny gis le 2 418 = NLS SIHL STVNGIAIGNI dO *ON ‘TVLOL 80°0 67°Z 7Z°O 08°0 88°0 48°0 (,f) ALILTIIGVLinda (,H) 97°0 86°% 76°8 9T°E 89°z OTE ALISUHAIG SALOadS A90dHud Wad 9°09-0°LT LIST 8°8E 8L 87 TS Wee SE “ddS dO ‘ON IVLOL €°6SE-0 €°1Or G° 921 0°8sT (AX) 8ce O8T cS ZL TIVLOL “ST “LT “OT “GT (5 (Li 0°? a2 =O a 9°? 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NVA SLIWIT °“dNOD NOISYAdSIG NOTLVIAKG 7] € 4 T Sd10ddS “TAWNS 10 % OLTYAWON INHOUAd S6 HO °ddH00 ais NVAW TVLOL UAGNAN aodddd LINVNIWOdaad LL61 MHEWNHOdd ZT aALvd @YIHSdNVH MAN S'IVOHS 4O WISI NOILVIS VLIVd ALISNAG OIYHWAN 4O WIEGVL - SOHINAG SOWVC €-0 ATEVL "e}ep auljaseq O47 JO SPLWL| BdUaPL Jud ¥G6 B47 YOLdap SauL| Uayxo4g *(Q) SLPOYS Jo sats] WOAJ SNLOLPOW SNLOLPOW UL S_eZaW AAeay yo soLyea ay? UL UOLZELURA jeuoduiay ‘py aunbL4 Fig-% 43%) | LOBSTERS f (SUMMER) DRAGGING CWINTRR) \ 1 D 1 SF ASAL Sa pa (PROPOSED > Ny ADP wee, POLLOCK a (eee NI eS) (LOBSTERS ~ f GRAY, SOLES 1° (SUMMER) a 4 SISRER SS IN wis WiCIN Tie [ale (SEES ORs SHeReSe DiSPHSAe woe The area surrounding Appledore Island (the site of the Isles of Shoals Marine Laboratory) has been nominated as a federal marine sanctuary. This is mainly to protect intertidal areas which have been studied over a long time period and should not effect fisheries or disposal at the study site. In preparing this report, interviews were conducted with 2 lobstermen (Kittery) 4 inshore draggermen (Portsmouth, Glouchester) and 1 gill netter (Portsmouth). Most individuals have been contacted more than once. Lobster, Lobsters are caught close to the Isles of Shoals and its ledges dur- ing the summer. In the winter and spring, the fishery extends into depths of around 60 m. Catch per effort within Maine waters is very high because the area is not overfished to the degree that many other New England areas are. Lobsters within the dump site tend to be large (14-3 Ibs.). Catches vary from very large to very small. Many clawless lobsters are caught (lobsters dose claws when run over by fish dragging gear or wnen as shorts they catch their claws between laths. Much of the winter fishery in this general area is carried out by New Hamp- Shire vessels. It was reported that winter lobstering was extended into deeper water east of the dump site in 1977. Catches were good, but there was some con- flict with draggers. The lobster fishermen interviewed so far are not very concerned about the potential effects of spoil disposal because of the small volumes which will be cumped and because earlier dumping had no detectable effects. Finfish, Small draggers from York, Kittery, Portsmouth, and Glouchester, fish in this area. There is considerable variation in tow routes and techniques in the area so that it has not been possible to map fisheries in great detail. Cod and haddock are caught during March to May in tows 2 miles east of the dump site and along northeast-southwest ridges several miles south of the site ("eastern passage", "pipe clay tows"). Whiting (silver hake) are caught in these areas in the fall and pollock are caught in November and December. Gray sole are caught on patches of level bottom surrounded by rocks in the summer and early fall. Dab and cusk are incidental catches in these areas. Gray sole fishing commands a high price but requires detailed knowledge of the bottom. One fisherman has fished for gray sole in the valley on the southeast corner of the large dump site. It was reported that many JATO rocks were re- moved from here. Another fisherman has fished small but productive areas on the inner edge of the large dumpsite for many years. Neither of these fisher- men considered the valley which is proposed as a dump site to be valuable fish- ing ground. Gill nets are fished within the large dumping ground and south of it along the 80 meter contour. An "edge" is defined in the dumping ground but not south of it. New Hampshire vessels fish in the dumping ground area and Maine vessels fish north of it. Cod and haddock are caught from March to May. Cod remain in the area dur- ing the summer but the presence of dogfish sharks ends the gill net fishery. Pollack are caught in November and December. The area between the Isles of Shoals and Cape Ann is an important spawning ground for pollock (Nov. - Feb.) and cod (March - April). Spawned out cod ("s]unk") are sometimes caught on the southern edge of the large dumping ground. Both of these fish have floating eggs. Herring spawning grounds are located both inshore and offshore of the Isles otf Shoais. The inshore area is much less important than the offshore grounds on Jeffreys Ledge (Boyer et al, 1973). In 1972 there were two concentrations of herring eggs on Jeffreys Ledge, 20 and 22 miles from the proposed disposal site (Boyar et al, 1973). It was hypothesized that these areas were a major source of larvae for the western Gulf of Maine. ey