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HomeMy WebLinkAboutexhibit attachmentGATTACHMENT G Benthic Mitigation Plan BY: COASTAL SYSTEMS INTERNATIONAL ; 31):i.i811014; JUL-15-04 1:40PM; PAGE 2 Flagstone Island :Gardens Mega -Yacht Harbor Benthic Cog.inunity Mitigation Plan Rc .1 7 2d July 15, 2004 l(1, U'C f SUMMARY The proposed Flagstone Island Gardens Mega -Yacht Harbor Project (Project) includes reconfiguration of an existing marina that t.s currently located alang e he oxtson t lyan d 5 81lkh yes. buead. rop The dredging limits for $ he proposed�i artna basin dredge and fill activities, to depths including areas antho enicall ini ac ted by p ranging between. —18 and —25 feet. The proposed dredging is required to accommodate mega -yacht vessels ranging between approximately 100 and 450 feet inlenl;ththe off-season slip mix of 50 vessels proposes smaller yachts on the northern and southern pier ;,r ms during the slow season for mega -yachts (summer). The area to be dredged contains a shoal pith sediments ranging from silt to sand, and limerock that are likely the result of spoil depusi:. a from dredging activities in the adjacent turning basin. J1X1STINC BENTH1C R .., MRC..ES AND PROPOSED IMPACTS Benthic habitats within the Project area win be categorized into the following sub -on munaLed based on differential structure and other conditions: 1) turning basin wall, 2) sponge - omin communities, 3) bulkhead communitieti, and 4) mud/sand substrate. Sparse macroalgae is ubiquitous in the former three commu+tit 9 areas. These e stcommunities l Systems International, fu (her described below and in the Field Observation Reports produced by Turning Basin Wall: The turning begin wall is a community that was created e dw when the Port of Miami dredged the area down to deptl.s ;Treater than 30 feet for navigationpurposes. within the project area is located in Iva rr depths ranging from approximately —10 to —30 feet NGVD, the slope of which averages ap M c.ximately 1.5:11'. To and st30 ate fe coveraget NGVD wthe is habitat �y resources, vertical surveys between a1:1, r )ximatclyn every 50 feet along the turning basin ;ill. The majority of resources are lanaied crone de w l between ,water depths of approximatel) -10 and —20 feet (NGVD), with coverage in this zone of approximately i t. %. Betweenwater averagedepths rxi covematelrage—20 and — 30 feet (NGVD), resource coverage is m;t±h sparser less The dominant' communities on the Inning basin wall are sponges and soft corals. o coal Several branching (Occulina spp.) hard corals w::re observed on the turning basin wall.B s sparser Rased on the average turning basin wIll <lore of 1.5:1, the total surface area between —10 and — 19 feet (impact zone) across the 1,050 Ducar feet of wall to be dredged is approximately 16,800 square feet (0.39 acre). The total sur1'uc,- area to be impacted between —19 and —26 feet for the dT SY: COASTAL SYSTEMS INTERNATIONAL ; GOP3611914; JUL-15-04 1:49PM; PAGE 3 201701 Benthic Community Mitigation Plan July 15, 2004 Page 2 500-linear foot deep dredge section is ei':mzated at 6,300 square feet (0,14 acre). Please note these impact area calculations include 1 fc i,'t of overdredge. The. total area of impacts proposed is 0.53 acre. Sponge -Dominated Community on Debris: Sponge -dominated communities, attached to exposed limerock, shell/rock fragments, logs, and other debris, are found within a 3.5-acre area of the submerged lands at the Project Site. This area contains sponges with a highly variable density with an average density (non-NN chthted by arca) of approximately 7.5% based on recent quantitative surveys. As only that area aontaining hardbottorn or debris at the surface is capable of supporting sponge communities (.7 n eas the silt/sand surrounding the debris), the,: sponge habitat area is calculated at approxin.t t y 11,435 square feet (0.26 acre) within the 3.5-acre boundary. However, DERM has reque'e 1 that the entire 3.5 acres of hard bottom community he considered for mitigation, rather than Cu direct impacts to sponges of approximately 0.26 acre, given that a number of resources both .ntc l•,ile and sessile, utilize these areas. The mitigation area has been revised to reflect this 3.5-acre gal :aa. Typical sponge communities include 1ogt;erhead sponges, vase sponges, encrusting sponges, and tube sponges. Macroalgac is often found attached or proximal to the base of the sponges. Miami - Dade County DERM staff reported cn: star coral within the sponge -dominated community during the August 21, 2003 site inspeca o i. Bulkhead Community: The bulkhead (approximately 920 linear feet) within the Project site supports dense benthic communities containing sponges, algae, a few hard and soft corals, and other sessile organisms. To estimate org : nisrn densities, vertical surveys were conducted every 50 feet along the bulkhead. On average the bulkhead is nearly 100% covered with organisms from the water line to approximately ; '. 2 feet NOVD. 50 to 60% of the resource coverage consists of sponges. The number of hae I : )rals on the bulkhead is estimated at 10. The bulkhead will be directly impacted l: y installation of 14-inch-wide piles at the face of the bulkhead to support the marginal dock. These piles will be spaced at approximately 15 feet on - center, resulting in approximately 856 (n-1.17*61*12 vertical feet) square feet (0.02 acre) of direct impact to bulkhead resources. It is estimated that approximately 6 vertical feet of bulkhead may be impacted secondarily by shading associated with the proposed marginal 'dock; the area of potential 'secondary impacts is approximately 5,520 (n=920*6 vertical feet) square feet (0,126 acre). This area is used as the impact esseasment area in this version of the mitigation plan. Macroalgae Community: While max,: algae is typically found in the same areas as other communities onsite, there is an area of approximately 2.93 acres that contains sparse coverage of macroalgae outside of the comnnunitic•s t oted above. Unvegetated Bottom: The unvegeta'red ubstrate, which covers an area of approximately 6.93 acres, contains infaunal organisms that v 1i be impacted by dredging at the project site. This is a temporary impact, as an infaun.al corn ri,unity will re-establish after the dredging project is •JT EY: COASTAL SYSTEMS INTERNATIONAL ; 13'.'t1611914; JUL-15-04 I:49PM; PAGE 4 201701 Benthic Community Mitigation Plan July 15, 2004 Page 3 completed, but there will be a time lag b+ ! ,veen the impact and recovery of this community that will be addressed through appropriate mit.gation. )ENTIIIC RE ti )'J, (CE IMPACT MINIMIZATION The Project goal has been to minimi.P'inpacts to benthic communities to the greatest extent practicable, and then to adequately el t ;r ensate for unavoidable losses to these habitats. The proposed bulkhead replacement vast -' and of the existing bulkhead, which is standard engineering practice, was re-designei i be located landward of the existing bulkhead to minimize resource impacts. As the primary impacts to marine resc i. r;:es at the. Project site are duc to dredging activities, dredge depths, particularly along the tun ig basin wall, have been scrutinized several times by the applicant's consulting team. It is tea?plicant's goal to bring in the market's largest mega - yachts into the proposed facility. Whit I ;c slip layout shows vessels as small as 160 feet on the exterior marginal dockage as a demoue :tion of typical slip mix, the range of vessel size these slips will accommodate is up to apprt .0.lately 450 feet. Re -designing the harbor to limit vessel draft to less than 18 feet would severe;; ►vrstrict the Iitnctional capabilities of the facility. It is not possible to reduce the depth of dredgi:is ,:long the turning basin wall without compromising the size of mega -yachts that can moor alort; Ale prune exterior marginal dock space. This evaluation of impact minimization is dcscribec ri.lre fully in the document entitled "Avoidance and Minimization Measures — Site Alternas i i Analysis". BENTHIC R. 'i Y ]RCE IMPACT MITIGATION The compensatory projects address una •idablc impacts to the benthic community resources described above through creation of sirnj': r habitat with equal or greater services over time. The state's Uniform Mitigation Asses• ,rt att Method (UMAM), Chapter 62-345, Florida Administrative Code, was used to conirr appropriate levels of mitigation. Turning Basin Wall: Prior to comment a ncnt of dredging activities, soft corals and hard corals within the impact area that can be effr.e ttly and successfully moved will be relocated to an area north of the proposed dredge activiti c . Immediately north of the FDOT right-of-way and MacArthur Causeway, shallow submc ; ,s areas are proposed as recipient areas for relocated soft and hard corals (see Benthic Organise:, tit a'ocation section). The turning basin wall is an artificial i a tat that was created by dredging a vertical wall at the edge of the Port turning basin. The Lac it:on is isolated and is not part of a larger continuous ecosystem. Pelagic fish and invertebrae use the habitat for refuge and foraging; the hard substrate supports sessile benthic orgai.i: ms. The community structure for the upper turning basin wall consists of an average of 2O ;overage by sessile epibenthic organisms, with low to moderate diversity of species (majority of species coverage is by sponges and soft corals) as noted above. The lower turning bas;r all community structure consists of low coverage of T BY: COASTAL SYSTEMS INTERNATIONAL ; 23t.0811914; JUL-15-04 1 :50PM; PAGE 5 201701 Benthic Community Mitigation Plan July 15, 2004 Page 4 benthic organisms (less than 10%), with. r. low diversity of species. The water is turbid and water clarity is poor, particularly at deeper elevations of the wall, but good flushing exists due to the high degree of tidal influence. These f.lctors are addressed in nnte values sin input(Cominto the)"aUM AM spreadsheet entitled "Uniform MitigatiE: E AssessmentS Note that in the original proposal, the caning Basin wall was divided into an upper and lower region; these regions have now been,00mbined for ease of calculating mitigation utilizing UMAM. To compensate for the immediate and interim loss of habitat, d. creationThof for of munitturni� with equal or greater function than the impacted habitat is prop basin wall uses a time factor of 11 to 1 years, to replace the functions lost within the impact area. A conservative risk factor of 1.5 is. used in the UMAM. The UMAM results indicate that apprw:i.';tately 1.68 acres of mitigation is needed to compensate for the 0.53 acre of impact to the turning`basin wall (approximately a 3.17:1 ratio). The proposed mitigation will consist of two elements to appropriately address replacement of the functions created by the more vertical nature of tt,e taming basin wall for pelagic fish species in addition to the refuge functions for invertebrates an 1 substrate/foraging functions. Pelagic refuge functions of the onsite vertical mitigation elemes,c . t:e anticipated to offset impacts more immediately than other community structure functions. Offsite Mitigation: The first mitigation, c3rnponent to compensate for lost turning basin wall functions consists of benthic habitat crcadon offsite at the Brickell Artificial Reef site (see sheet 1 of the enclosed sketches for location information). This cotnponetit is provided to accommodate substrate functions for ;sessile benthic and boring organisms that are similar to those provided by the turning basin wii 1. The habitat will be constructed. of 2- to 4-foot diameter limerock boulders. Approximately 1.12 acres of habitat is proposed offsite (2:1 ratio - see sheet 5 of the enclosed sketches for conceptua layout and typical cross-section). Florida Department of Environmental Protection (DEP) and ORM permits, including a Consent of Use relative to the state lands, have been issued and are Fictive for the Brickell Artificial Reef site. Authorization will be issued by the U.S. Army Corps of Engineers as part of the Flagstone Island Gardens project or to DERM separately (see atta;c, red DEP and DERM permits for artificial reef creation). Onsite Mitigation: The second mitigation component is proposed onsite to compensate for the loss of functions provided due to the vertical wall characteristics, which were difficult to address clearly in the UMAM analysis, as well r,s to provide additional high lief habitat by placing 3 to 41 foo� boring organisms. This element includes crealwn diameter limerock riprap boulders onsite in water depths similar to those where the impacts will occur (see sheets 3 and 4 of the attached permit sketches). tThis a fire turning basilement n wall face es 0.56 acre at a surface area, mitigating for the rcfugc function lost 1:1 -ratio. r ©Y: COASTAL SYSTEMS INTERNATIONAL ; >>rf;OiiSi4i JUL-15-04 1:5OPM; rNvt o 201701 Benthic Community Mitigation Plan July 15, 2004 Page 5 a mi ti Summary: Therefore, to account for in•ttilr In loss of functions, a total of eom: on ti ad on ratio scribed is proposed for the timing basin wa+':vitas cumulatively by the two above. structures ar% ,l�:signed based on simple ratios of surface area lost to In addition, the mitigation struc�.� �� spaces created by the large limerock boulders to be surface area created; in reality, the inter: surface area used for construction of the onsitc and ��.ffsite habitats will provide much greater than that lost. s, soft Sponge -Dominated rals,ahard Community Prior to commencement of dredginga and hies, successfully corals, and hard corals within the itnpa'''' area that can be efficiently will be relocated to (those that are attached to discrete pic}c,sfof debris such as cobbles Causeway (see Benthic the area immediately north of the FDOT . right-of-way Organism Relocation section for addit'zin )1 information). The exiin sponge -dominated habitat ir, very discontinuous and a common ty habitat is low at matuiity of the organisms within itt g varies widely. Density of spor,g�,s across the entire span$ See attached spreadsheet 7.5%. The community structure is sco'A;� .at a� level of 6 in the onge Community because of the low density of entitled "Uniform Mitigation Asscssni � P ., sponges on es measured during field investigst•. cans. We are addressing impacts to a 3.5 acres ofsponge community.•., A time lag to achieve full se, � cs fort e mitigation project of 11 years is used. The UMAM recommends 5.96 acres of mitigation to compensate f r offsite w5hacresitquf i pact ater (approximately a 1.7;1 ratio). Benthic habitat creation is proposed o compensate for the unavoidable functions (more continuous substrate and better water clarity) o ttorn impacts to p $ s on e-dominated community habitat, This design will nsist f a site (see sheet habitat construction at Miami -Dade County Dl;1L'Id's Drickcll we anticipate that sponge - of the attached permit sketches for a location map). Additionaliy, dominated communities may colonize thi° substrate post -dredging, as sponges ereand s for ft ora5 is are res found at depths of 18 to —19 feet cunx:n.ly along the tu5.96 9� acres of habitat are proposed to be basiof impact to the sponge community a! tliu P>�cct site, offsite in addition. It the ofsite hardbottom area that will be available for created (1.7:1 ratio ) sponge colonization• structure design i based on simple ratios of surface re a tot to sur surface The offsite to mitigation s , y � it created by the limerock boa area created; in reality, the greater rug. ' y surface area and continuous of the mitigation project will providemuchgreater habitat than that lost• Community: The UMAM br bulkhead community impacts (sec attached spreadsheet en Bulkhead C "Uniform Mitigation Assessmejtt �•- Bulkhead Resources") ists ondtheses face of theation for existing entitledi impacts to the relatively mature community structure thatthe installation of piles, bulkhead. The flat vertical substr l' ti}{l fil hav erlvalue than thebe arxs tiby ng due to potential shading although this habitat may be of a . g ' BY: COASTAL SYSTEMS INTERNATIONAL ; 301.18811914; JUL-15-04 1:5OPM; PAGE 7 201701 Benthic Community Mitigation Plan July 15, 2004 Page 6 marginal .d•: ck (this is addressed in the UMAM). The UMAM impacts from the proposed requires creation of (approximately a 1.46:1. ratio). Creation of 0.19 acre of gallon rr�i•itihe Brickell Artificial Reef is proposed. As approximately 0.19 acre of Benthic con. j.nunity with the sponge community rnitigaticfl,, the rugosity providedi c y the lisurface areboulders than that to be used for construction of the mitigation F � ojec:t will provide mu greater lost. Macroalgae Community: As discussed tibove, there is an area of approximately 2.93 acres that 0 contains sparse coverage of macroal�,f�c' outside of the communities noted p1ey1Uu� feet compensate for impacts to the macroa1 i.[.e community, a ratio o f 1 cubic yard d per sq yards set of vegetated submerged lands is proposed. Therefore, approximately for pacts to riprap are proposed to be placed at the Brickell Artificial RDERM guidelineeef Site as eland precledent in the macroalgae community. This rat,c� consistent ects previously permitted. In midi :i r1, the South Florida Water Management District has p ro} confirmed that this ratio would be acce;pti3le. 3 compensated Bottom: The unvegetateil ,I.ubstrate covers an area of approximately 9a d cres .1 To 0 compensate for impacts to the unveget"t !Li bottom cornrnunitiesrox atia of y 1 cu cubic yards of square feet of unvegetated bottom is proposed. Therefore, app ants to riprap are proposed to be placed at the 1 �� ickeil Artificial b�� �idcl mitigation precedent in the macroalgae community. This ratio s consist 'ects previously permitted. In addition, the South Florida Water Management District has P ro} confirmed that this ratio would be acc•:pt;51e. mitigation for 1.92 acre Seagrassact Miti ation — Out of Kind Habitat Creation: Pursuant to discussions is uusi ns wi h SoouthuthImp 1: Florida Water Management District staff, miti B e sea ass impacts at the Project site is rc•,q tired at a 3.5:1 ratio. This mitigation will be provided at a 3:1 ratio through restoration of seags•is t habitat within Biscayne Bay; the remaining 0.5:1 ratio of mitigation will be permitted by SFV l E' D staff throughhabit ntreation at an artiityficial habitat reef f site. the Therefore, the applicant is proposing t add 0.96 acre Brickell Artificial Rccf site to complcte,t >>: seagrass mitigation requirements. i Reef Summary : The total benthic community mitigation to be provided at the Brickell Adtnac l with site is 7.83 acres of surface area. The firi�il design will be adjusted basedupon all regulatory agencies. As noted above, DEP and DERM permits, including a Consent of Use proprietary rietary authorization relative to state lands, are active aoo�heAutharization will be issued by rickell Artificial Reef site (see attached DEP. and DERM permits fo` a lditional information), the U.S. Army Corps of Engineers as part of the Flagstone Island Gardens project permit and/or to DERM under a separate pending permi. r SY; COASTAL SYSTEMS INTERNATIONAL ; 3OEC611S14; JUL-15-04 i:51PM; PAGE a 201701 Benthic Community Mitigation Plan July 15, 2004 Page 7 BEN it'_� r'R(:AN[SM C I1 ± The purpose of the bcnthic organism re;.o:ation plan is to }nimize plan is est�mated to benefit up toacts to submerged r2S� resources to the greatest extent practicah'.e.. This relocation 30 sponges and approximately 14 and 10 hard and soft corals, respectively.. re Relocation Site and Conditions: Two ;elocation ssoposed organismss swill patentde of the di 11dy�be 3l :ypes zone, based on two differetpes of environments salvaged from. Sponge Community organisms: The 1-st relocation site is located north of the ePrroaect sic d Sp 8 for north of the MacArthur Causeway l•:'ir ilge; this area will sketchest for location). The sponge community organisms (see sheet 2 o , ' t le attached p relocation area contains populations of slmngcs and a°gae 1S in 2004 submittal)_ No sponget or ty range (see Mixing Zone Survey in Alaf,r,;r;dix D of theApril macroalgae resources at the relocation silt: will be supplanteds as iat of the Project sby the relocation pC, and is outside . This site was chosen because it maintains the same ;haracteristics the proposed dredging mixing zone. These site characteristics include water depths, temperature, salinity, current velocities, grid light penetration. Bulkhead/Turning Basin Wall Organrpr.y; The second relocation attached toosen as a suitable the turning basin location for the placement of relocated hard/soft coralscurrently wall (see sheet 2 of the attached permit sketches for location). This second site is located west and slightly north of the Project site, a.lo3+gt the northern a�risticsgbasin wall outside of the mixing ta th se identified at the est m zone. This relocation choice maintains, . imilar charte turning basin wall. These character) tics include t�e��c�h,l� �i� _ (instead liof horizontal current velocity.maintain natural orientation), light pcie.. ation, wilier P the northern velocity. Once removed, the organisms; will be relocated to similar depths along turning basin wall. These submerged lands are owned by th City of Miami (see Deed No. 19447 in Appendix of the July 11, 2004 SFWMD application submittal package). Relocation Methodology: Sponge Community Organism Relocrat;k U Techniques S 1. Th e relocation area will be staked a` i' with buoys during benthic organism reelo t pion. GP S coordinates will he collected to cc.lnFirm the four comers of the area. L nd w will be permanently installed to ctt:l; tteate the relocation area for thc life of thc monitoring project. 2. Sponges and corals attached to disrae. debris within the sponge comunitye debriswill be eloc the utilizing a shovel, pick, or other 'c i. lodging device. possible, T BY: COASTAL SYSTEMS INTERNATIONAL ; 30E:0611914; JUL-15-04 1:51PM; rKut 201701 Benthic Community Mitigation Plan July 15, 2004 Page 8 dislodged with sponge community trganisms attached, and restored transported rt debris inplastic the trays by boat north to the relocation area. Sp . iges and corals will be me or similar physical orientation as when removed. Turning Basin Coral and Sponge Relocati )n Techniques 1, The relocation site will be flagged using buoys and other submerged markers. The submerged markers will remain in place for future monitoring and evaluation. 2. To the greatest extent practicable, comls (hard and soft) and sponges will be dislodged from the Turning Basin Wall with a piece of substrate attached. if necessary, the base of the hard coral will be dislodged from the sub trate utilizing a hand pick and hammer. All handling of coral will be done in conjunction IA, ith best management practices and relocation techniques, such as utilizing gloves to handle ..h = corals, and keeping the corals submerged in water to avoid desiccation during transport. 3. The subject corals will then. be transported via boat to the Turning Basin Wall relocation area. 4. A two-part epoxy will be used to re -attach the rock or other debris containing the coral, or the coral base itself to suitable substrate, Relocatiofl Monitoring: Monitoring Schedule. Monitoring is pro posed for a total of 5 years. A baseline survey will be completed and for the first year, monitoring s5ould�cofolloty ngguarteis t}tc proposed followed scheduley bi- for annual reporting for the remaining ,4 yew submission of reports, if relocation work c'aas to be completed by August 2004: • 1 xm Report - December 2004 ▪ 244 Report — March 2005 • 3rd Report - June 2005 • 4ttti Report September 2005 • 5th Report - December 2005 • 6th Report - June 2006 • 7th Report - December 2006 • 8th Report — June 2007 • 9th Report - December 2007 • 10th Report — June 2008 • 11tmt Report - December 2008 • 12t`' Report — June 2009 Monitoring Criteria: The following art:. monitoring criteria for sponges and corals. Ten percent ec o of each relocated organism type, or 5 ganisms of each type (sponge, soft coral, hard cwhichever is greater, will be monitored :t provide data that may be useful for consideration of future projects by the regulatory agencies . T 6Y: COASTAL SYSTEMS INTERNATIONAL ; 30:E3611914; JUL-15-04 1:52PM; PAGE 10 201701 Benthic Community Mitigation Plan July 15, 2004 Page 9 • Visible signs of stress including but not limited to color (dying or dead membrane), al a or fungus growth (to Include measurements of the area impacted to evaluate bleaching, g increase/decrease in size of area over time) • Signs of new growth/size of organism (width/height) • Additional colonization of new organisms adjacent to the relocated resources Success s Criteria: No success criteria arc ?roposcd, as the number of orrgganismTe o b i sal ag�on is relatively small and this benefit is �ac►t considered within the habitacomponents. The reporting regarding suc.ess can be used by the agencies to evaluate feasibility of larger scale relocation efforts for futon projects. ADDIT1ONA i. hiw riGAT ON 1410NJTORING Onsite Invertebrate/Pelagic Habitat Creation: To be determined, as applicable. Offsite Mitigationt Monitoring for placement of riprap en at an stabblissheded as an cMian -Dadele locor�inty far reef project site is not proposed, as tlir area has b artificial reef creation and the succesti of artificial reef projects in southeast Florida is well documented. IFAR..jee140170104ltlpuicoNBemAieCannwn*YQ UT 1,3) kiiticConimuxiryMaipnionPIcn'r/virPd.doi T SY: COASTAL SYSTEMS INTERNATIONAL ; 30a8811914; JUL-15-04 1:52PM; PAGE 12 TacMANICEASHIP LJ WOes+o ary OF MIMM &iiiFiSfONE CAW GARDENS, U.0 Wrt.$;N ISLAND y4111:1i! r`L 33132 COAST t I;SYSTEMS P4ITERNATTONAL. 1NG Toll M/M;•s�a 64‘ Slur Cr /w •'t i. pap Chasaul.tori,rwrest ditrelnkurlyold maraparnart 1SIAND GARDENS MEGAYACHT HARBOR MARK MUM RELOCATION Wits JOB; 201701 DATE: 07/08/04 S1l:—...... SR SKEET 2 OF 6 T BY: COASTAL SYSTEMS INTERNATIONAL :A)!6611914; JUL-15-04 1:52PM; PAGE 11 INDIX OF SHEETS 1. LOCATION MAP 2. MARINE RESOURCES RELOCATION MAP 3. ONSITE MITIGATION PLAN 4. ONSITE SECTION A 5. OFFSITE LOW REIJEF 1fi1GATION IAMGATION 6. GENERAL NOTES TJL GIMP ?L.80410 / _MITIGATION PILO= ONSITE PRO 1 I • i 1 P...."'ff WI Ifni Atli ir, _ --..........__..-,,f,er.., iiiiisi iza 4....,.t_s_...ur e ilk), ti-ziii, ■ gitkrir ..,„,, f :444 IsIr.MI: •■I 10:41•1+a till �� 91117i:I! ll' al nhlulUE, It:zzliiiril =II��0wit li, I1I�■ ••=m1A M/fr�flf 11aia.iiUlrl/ i.lin.ais�ulr 11i1a:::arrow �ti.utPalrlrl IltattaIPlIU snMR�rlu��.. �M��r,Nli ,flVII1; �arrlrf 11111100 Viiiii 4D 0 2500 5000 SCALE IN FEET 1 '65000' 01Y OF rMLAMI & FOLVONE BLAND GARDINSALC. 1040 MACARTHUR CAUSEWAY 11. 3313 �K i� � c �. Molds sous T•Y 215/00-0113 F71 ! II4 �0n WI 01WM I1J1m care; a,w• les&gh4 w Eldbarsing+ad :4';4i1cipgrllra RAND GARDENS MEGA —YACHT HARBOR BEMfF1IC COMMUNITY MITIGATION ' WGiION PLAN Joe: 201701 DA1E: 05/ 17/C 4 BY: MP SHEET 1 CF 6 JT 8Y: COASTAL SYSTEMS INTERNATIONAL ; 31!$611Q14; JUL-1t-o4 t :51riu1; W.I .4 1N ISLAND LILT !, FL 33132 COASTAdAYSTEMS ift elNATIONAL INC. i1010 Kim r� tea:• s a imp �� Gmswot, Chi V64 swot, o � � IVIt ir�wiri 1S1ANIGARDE I� HEGAYACHT HARBOR MARME RESOURCES aoCATION MN' Al 20170! DATE_ 07/08/0.4 ;: SR stilt 2 of 6 T BY: COASTAL SYSTEMS INTERNATIONAL ; (611914; JUL-15-04 1:S2PM; PAGE 13 APPROX. 200 LF. OF\ RIPRAP UNDER EACH TERMINAL PIER TURNING .Harr 0 100 200 SCALE 1N FEET 1" x 2O0 TX. 0m ovP APPROX. 200 LF. OF RIPRAP UNDER EACH VAIN PIER POT sni APPROX. ZDO LF. OF RIPRAP UNDER EACH SPIER \z" 0 0 aw OF hum a Futai,m rum Cam, WIN MAIO Milk, 41.. 33132 COAS"rA. Eti,VENIS IN.M ZONAL, INC. 11114 lash Rim d .4 Cowl *sift wow 114 104/441.14# 1)14 lAsa Onsed. balm Ord, Ck# 0111mdmilre wd lt+e ate+ ISLAND GARDENS MEGA --YACHT HARBOR BEN[HIC COMMUNIN MITIGATION ONE ?SWOON NAN JO& 201701 .DAT: 05/17/04 IIMP SHEET 3 OF C JT BY: COASTAL SYSTEMS INTERNATIONAL ; 21 3611914; JUL-15-04 1:53PM; PAGE 14 T.Buoarposmui 3_4' • is ELEV. _--8.0' 1 ( UMEROCK 1 r?". BOULDERS 4.,..,,‘ 1... ON:.1TE M111GAT1ON SCALE .1 - 101 an' OF MWw * MEDAN EILAIC1 CARDEN% IX WAISCK' SP.AND : 3132 COASTAL S11 VAS MaoR4TasATIONAL. INC. M 4South r+ ! slk,x Carl Ced4 nog* ei!! Alla amvivfrias ugh. -K wirtaadoirehrstrimit SIAS Mr !WPM t•I +REV.--ie.a' ISLAND GARDENS MEGA -YACHT HARBOR BENMIC COMMUNITY NfRGAT1ON OPWE SKIM A J08: 2O1701 TRAM 05/17/04 WY: LISOC SHUT 4 OF 6 T BY: COASTAL SYSTEMS INTERNATIONAL ; 3)6511Q14; «ry1 JUL-15-04 1 :53PM; PAGE 1 502 E = 920627.47 N = 515085.02 1. DOUBLE LAYER OF 1•� 0 UMEROCK BOULDERS 2. SURFACE AREA IS APPROX. 0.5 ACRE 3. THREE STRUCTURES OF THIS APPROXIMATE SIZE AND ONE APPROX IiALF THIS SIZE ARE I'R0POSED 10 PROVIDE AT . LEAST 1.5 ACRES OF HABITAT 4. GEOCRID, FILTER MEW., AND/OR OTHER SUB —BASE PROPOSED TO MINIMIZE SETTLEMENT AS MUCH'.A! POSSIBLE 120' 140' •I PROPOSED BRICKELL ARTIFIOAL REEF CONFIGURATION SCALE 1+ = 30' 4' 140' T__ RIPRAF SECTION SCALE = 30' T MARL. 41 Q'P ELEV. —6.0' TO —12' (APPROX.) ELEV. —10' TO —16' (APPROX. GRADE) ELEV. —10.5' 7O--10.5' FILTER FABRIC/ SETTLED BASE O1r OF MWW & fihritiM SAID WIDE IX WOW* ISLAND COA 1r - MIAIiII. 1. 33132 COASTAL ' !, t 9w IKIW &A�ONr1I. INC s > tx :n 'r c s1 rashoiligOlkamEtaird rmrr.ti . • ma >maEWiV ys{0,n U,Mu,. a:U. cue b glromo g 001 PAIMINIswi fsLAND GARDENS MEGA —YACHT wURB BE GHIC CCMMUNTIY MITIGATION MIME LOW KEW MITIGATION JCd: 201701 DATE 05/ 17/04 Ft MP I SHEET 5 of 6 IT SY: COASTAL SYSTEMS INTERNATIONAL ; 31 4611014; JUL-15-04 1:53PM; PAGE 16/32 Glam. tars 1. PERMIT SET - REVIEW CONSTRUCTION PUNS AND SPECIFICATIONS PRIOR TO COMMENCING CONSTRUCTION fropirrt , • 2. ELLYATIONS REFERENCED TO NATIONAL ti,,Eoprnc VER11CAL DATUM, (1920.. 3- HORI2CNTAL CONTROL COORDINATES ARE REFERENCED TO FLORIDA STATE PLANE CRID 1LAD-83. 4. RIPRAP BOULDERS TO BE INSTALLED AV 111E BRICKELL ARTIFICIAL REEF SITE IN ACCORDANCE WITH MIAMI-DADE DERMA PERMITS. 5. PRIOR TO INSTALLATION, CONFIRMATION C"F CORPS PERMIT ISSUANCE FOR ARTIFICIAL REEF SITE REQUIRED. RAGSTONE PlOPERT1ES, LLC WATSON M.N.10 MARINA MLAMI, fl; J3132 comm. SY,Vi wirERNATIONAL, INC trig Mina flipfti4a alCakilft Neweammeirtistn Cellit4 *idiom* L gra Rdresswaanit ISLAND GARDENS MEGA-YACI-IT HARBOR BENTHIC COMMUNITY MITIGATION WW1. mcns Mt 201701 Dtiat; 05/17/04 BY: MJP _ SHEET B Of b _..doPunINIMI.M.M.14.0.