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PBSD MSTBU Agenda 12/10/2012 Clam Bay Subcommittee JANp2 2012 BY: PELICAN BAY SERVICES DIVISION Municipal Service Taxing and Benefit Unit NOTICE OF PUBLIC MEETING MONDAY, DECEMBER 10, 2012 THE CLAM BAY SUBCOMMITTEE OF THE PELICAN BAY SERVICES DIVISION BOARD WILL MEET ON MONDAY, DECEMBER 10 AT 3:00 PM AT THE COMMUNITY CENTER AT PELICAN BAY, LOCATED AT 8960 HAMMOCK OAK DRIVE, NAPLES, FLORIDA 34108. Fiala AGENDA Hiller Henning r • Coyle The agenda includes, but is not limited: .. _ 1. Roll call 2. Draft Clam Bay mangrove maintenance annual report 3. Draft Clam Bay tidal analysis annual report 4. FDEP data for copper levels in Clam Bay 5. Proposed BCC ordinance amendment discussion 6. Date and topics for next Subcommittee meeting 7. Audience comments 8. Adjourn ANY PERSON WISHING TO SPEAK ON AN AGENDA ITEM WILL RECEIVE UP TO THREE (3) MINUTES PER ITEM TO ADDRESS THE BOARD. THE BOARD WILL SOLICIT PUBLIC COMMENTS ON SUBJECTS NOT ON THIS AGENDA AND ANY PERSON WISHING TO SPEAK WILL RECEIVE UP TO THREE (3) MINUTES. THE BOARD ENCOURAGES YOU TO SUBMIT YOUR COMMENTS IN WRITING IN ADVANCE OF THE MEETING. ANY PERSON WHO DECIDES TO APPEAL A DECISION OF THIS BOARD WILL NEED A RECORD OF THE PROCEEDING PERTAINING THERETO,AND THEREFORE MAY NEED TO ENSURE THAT A VERBATIM RECORD IS MADE, WHICH INCLUDES THE TESTIMONY AND EVIDENCE UPON WHICH THE APPEAL IS TO BE BASED. IF YOU ARE A PERSON WITH A DISABILITY WHO NEEDS AN ACCOMMODATION IN ORDER TO PARTICIPATE IN THIS MEETING YOU ARE ENTITLED TO THE PROVISION OF CERTAIN ASSISTANCE. PLEASE CONTACT THE PELICAN BAY SERVICES DIVISION AT(239)597-1749. VISIT US AT HTTP://PELICANBAYSERVICESDIVISION.NET. disc. Comes: Date: '--1 I c 113 Item#: IC_.= 2-4=4 IR-- 12/7/2012 10:24:45 AM LRJ Copies to: . W aukm ;=SAY /07kiirn3RVIVG.AND '11,IANAG V'➢° ANNUAL MONITORING REPORT or •t� t ygWy11M " „„`�, ,107, 7LL - k Lt1gto .r 1 e� � i *4- ..pAtAke::pe, ,„„. `4. ..., l`t� d,�iM. M,!s.. •. � . 44 ` ._... .t».. BY: TURRELL, HALL & ASSOCIATES, INC. FOR: THE PELICAN BAY SERVICES DIVISION DECEMBER 201 2 1 of 50 Clam Bay Annual Monitoring Turrell,Hall&Associates,Inc. December 2012 Introduction The Clam Bay estuarine system is a 570-acre area of sandy beaches,shallow bays,seagrass beds and mangrove forests on the coast of Collier County in southwest Florida. The community of Pelican Bay abuts the northern and eastern edges of the system,while the Seagate and Naples Cay communities abut the southern portion of the system. The Clam Bay estuarine system is an important natural and recreational resource for local residents and visitors. Clam Bay was designated a Natural Resource Protection Area by the Board of County Commissioners of Collier County in 1994 (Collier County, 1994)and consists of approximately 420 acres of mangroves and some 115 acres of shallow, open water bays, as well as a 35 acre beachfront parcel(Clam Pass Beach Park).The system consists of three primary bays;Outer Clam Bay(southernmost),Inner Clam Bay(central),and Upper Clam Bay (northernmost),connected by a series of tidal creeks. -$ y 74° ...✓" «„ Rj.•T�3�' e"', wit 114 Ji r m ...* «.+ 7c �yy�µ , • > per• :3 a` ♦ s �� ?a �l tl #y< <. 3: 4��� a ft w' 4' Y ; 'r;,., ._>•t. ` # a'saw ;S i�s a- le ' *-k+••, t i. . ; to ._. .�_ �+ ¢ a "L. + 't"r eun F ite` MOM, sue ? . +,‘"T` 4 1 a . *te as 1 v lvdrx" } ,� q i aSt,,`'..• ++i 'F'i!`^r' t' i j i f�a�n a�..�4+ ;M,� a sa'4 .;k J .. . a Y" siC s�•l�tz 'I a a r... a..fa• r� # x +, r� +a 11 a• ..4�`r c ♦' i- l t ,�< a .. '+ .ii • The entire system receives runoff from adjacent upland and wetland areas. Upper Clam Bay is connected to Inner Clam Bay by a winding narrow creek.Inner Clam Bay is connected to Clam Pass through another narrow creek. Outer Clam Bay is connected to the Gulf of Mexico by a wider creek through Clam Pass. Some water also flows south to Doctor's pass through the culverts under Seagate Drive. Clam Pass is a small,marginally stable inlet that has migrated north and south along the shore over the years. Prior to dredging,average water depths were-2.5' to-1.0' with a width of 30-50' (Collier County, 1994).The Pass remains the primary source of tidal exchange for the Clam Bay system, but it is restricted by sediment deposits just inside the pass and in the long meandering tidal creeks surrounded by mangrove forests. The smaller embayments located primarily to the north of the pass are not subject to normal tidal exchange except during exceptionally high tides.Tidal range is restricted throughout the Clam Bay system(Turrell 1995;Tackney 1996). 2 of 50 I Clam Bay Annual Monitoring Turrell,Hall&Associates,Inc. k December 2012 The system is bounded on the north by Vanderbilt Beach Road,to the south by Seagate Drive,to the east by the Pelican Bay development and to the west by the Gulf of Mexico. Pelican Bay is predominately a residential community of private single-family homes,as well as both high and low-rise condominium units. The community also includes a golf course,common areas with meeting rooms, tennis courts, beach park facilities, emergency services facilities, and commercial areas with shopping and hotels. The 2,104-acre Planned Unit Development (PUD) was approved in 1977 as a partnership between Collier Enterprises and Westinghouse Communities. It was one of the first developments in Florida required to save fragile coastal wetlands and associated ecosystems (Urban Land Institute, 1981). The development of Pelican Bay had a limited impact on the wetlands themselves(approximately 94 acres in total with about 78 of those acres located in the northwestern corner of the property)leaving the mangrove forest intact and preserved around the bays. In 1992 a small area of dead black mangroves was first observed in the northern part of the system. In 1995 a significant area(approximately 50 acres)of dead and dying mangroves was reported(Turrell, 1996). Following the die-off,restorative dredging was proposed to increase tidal flushing by opening up the pass and widening several tidal creeks within the system. The Florida Department of Environmental Protection(permit#0128463-001-JC)anki the United States Army Corps of Engineers(permit#199602789(IP-CC)),authorized restoration activities in the Clam Bay system,in an effort to restore the mangrove communities that had died off. The restoration activities permitted by state and federal agency permits required a suite of monitoring activities to assess effects of t e work efforts. Those permits expired in 2009 however, the Pelican Bay Services Division (PBS ), in an effort to remain informed of the condition of the system, and vigilant in their protection of it,pursu d new permits in order to continue the maintenance of the flushing channels within the forest areas. Permits were granted by DEP(permit #11-0128463-005)and ACOE(permit#1996-02789)authorizing this activity. Maint nance of the main channel and Clam Pass will be undertaken by Collier County through a separate permitting p ocess. Like the previous permits,the new permits require annual monitoring of mangrove and other compon nts within the system. This document presents a summary of the mangrove and seagrass monitoring which as taken place within this past year. It also summarizes tidal and water quality data collection that has occurr d within this past year. Mangrove Monitoring Methodology I The mangrove monitoring undertaken this year was a continuation of monitoring which was initiated under the permits.ermits. The eleven existing Turrell,Hall monitoring plots and eight of the origi al Lewis mangrove plots were observed. The previously established monitoring procedures were con ucted. These included documenting the number and species of trees within the plot,as well as their appro imate height. Each monitoring plot is a measured 10m x 10m square staked at each corner and m rked in the center with a labeled PVC pipe. Monitoring activities included enumeration and mapping of 1 ving and dead trees with diameters at breast height(DBH)recorded for all living trees with a DBH greater th n 2.5cm. Seedlings were identified by species and numbers were estimated by count or percent cover (w ere high numbers make individual enumeration difficult). In 2003, each measured tree was tagged and ide tilled with a plot specific 3of50 1 Clam Bay Annual Monitoring Turret!,Hall&Associates,Inc. December 2012 number to allow for easier tracking of individual trees as well as to allow easier comparisons over time. Any saplings that grow to sufficient size(>2.5cm DBH)between monitoring events are added to the tree counts and receive tags and numbers as well. Photographs are taken and any additional observations,including standing water,wildlife or signs of stress are noted. Time,tide, and prevailing weather conditions were also noted for each survey. Meandering transects were walked throughout the system to inspect stressed areas or to observe areas of concern related by residents of the community or identified through examination of aerial photographs.These surveys are conducted throughout the year as needed.Observations made during these pedestrian transects are noted in the general biological discussion of this report. A photographic timeline was also initiated this past year. Concerns expressed by residents led to the establishment of photo points on the roofs of two condominium buildings adjacent to the mangrove area. Quarterly photos are taken from fixed positions on the roof of the Montenero and the Grovesnor condominium buildings. Over time, comparisons can be made of the photographs to determine if any additional die-off or gradual changes are occurring. Each year, scale rectified aerial photographs are taken of the Clam Bay System by Aerial Cartographics of America. The aerials are produced at 200-scale in both color and infrared versions. These annual photos can then used to compare recovery and die-off areas for the annual reports. Mangrove Monitoring Results A summary of the 19 monitoring plots have been included on the following pages. Plot discussions, comparative photographs,and tree compositions have been included on each individual plot page. 4 of 50 ,. f cnct.� " N '�' y °' " " ' = Ira o cn a)�' av t)1) , 0 0 a 0 = to a, c N „ 0 -OO a N -0 �. a, o • o .0 - ct bn 2 > •� c * ., ,f ` rte. p ct to c,- 2 'O ¢ ,, E ., k .•41 S. "` , cn 1-2,c . bn 0 c � - > to !� v Nt...... i",ed 0 ,..c r.41'4*4 -',Y-N to.0 ., bn.. O ,A, Qi' , rye. 0 Lo O in E 0E) U o E O O U U) ,- O O i .2 4, '...4. N .�y�, * ''" .t `at it .,gip - h3 ' co `iR#, ,,5 x` 'fig• .. ca et ` ��` .r ' IL t t �� 4. 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T I- L > op — cz C a u C bq~" Q -0 O a - CC 4 'u 4 d 1 1= o4N x N 1 V (N O 0000 ((D V" N N g8 sie;ol Gall U F A • Clam Bay Annual Monitoring Turrell,Hall&Associates,Inc. December 2012 r Condominium Roof Photos Montenero Roof July 2012 Montenero Roof December 2012 24 of 50 Clam Bay Annual Monitoring Turrell,Hall&Associates,Inc. December 2012 • Grovesnor Roof July 2012 Grovesnor Roof December 2012 25 of 50 Clam Bay Annual Monitoring Turrell,Hall&Associates,Inc. December 2012 An issue from the past year that we have been observing is the presence of boring beetles attacking stressed trees in the early months of 2011. Observations within the system and research into the life habits of many boring beetles led to the conclusion that white mangroves affected by the sustained cold temperatures in December 2010 and January 2011 were most susceptible to the beetle attack. Cold stress reduced the abilities of these trees to fight off the boring activities and many trees succumbed to them. Yellowing leaves,leaf drop,and eventual death of the tree was the result. The dead trees are easily visible in the rooftop photos on the previous page. Efforts made to identify the beetle identified at least two species,both round-headed(Lon horned beetles)and flat-headed borers(Metallic beetles). No further loss of trees was documented this year as a result of the borers but continued vigilance will be maintained to see if additional infestation occurs in the future. � - t White Mangroves affected by cold and borers Borer damage to stressed tree 26 of 50 1 I i Clam Bay Annual Monitoring - Turrell,Hall&Associates,Inc. ` December 2012 Seagrass Monitoring Methodology Seagrasses are a valuable biotic indicator of environmental health and the PBSD has recognized the value in maintaining viable conditions for seagrass growth. The original permitted dredging design-entailed impacts to seagrasses within the channel between Outer Clam Bay and Clam Pass. Monitoring over the life of the permit was designed to allow documentation of the regeneration or loss of seagrasses within t e system and follow the effect of increased tidal flushing on seagrass aerial coverage and density within the tentially affected beds. These monitoring practices have continued in order to further document the overall health of the Clam Bay system. Monitoring methods include examination of aerial photographs and ground truthing by in-water and wading surveys. Accurate estimation of seagrass coverage is primarily hampered by visibility. The type of seagrass and limited visibility make estimation through examination of aerial photographs almot impossible. The most effective survey technique has been diving and wading transects and the most effective time has been at low tides when shallow water and substrate exposure make coverage estimation easier. est effort was made to overcome the visibility obstacles in those areas that were deeper. Due to the ephemeral nature of the grasses being monitored,the survey methodology h s been slightly modified from what was originally permitted in the 1998 permits. It was noted early on that the seagrasses shifted in location from year to year and that fixed quadrats in the same location year after year id not accurately depict seagrass coverage or presence within the Bay. More general observations of the preser ce of grasses along these transects have been used to locate the grass beds with the quadrat measurements used to quantify coverage within those areas where grasses are found. Grass beds in or adjacent to these transects are then mapped with a handheld GPS unit(Garmin 76c)and transferred to an aerial exhibit. 27of50 Clam Bay Annual Monitoring Turrell,Hall&Associates,Inc. December 2012 Seagrass Results Outer Clam Bay: Transect 1 Transect one was surveyed with snorkeling gear in water depths from 2 to 3 ft. Visibility was approximately 8-10 inches and was easily reduced if sediments from the bottom were stirred up. Shoal grass (Halodule wrightii)was found within quadrats 2,3,4,5,and 6,and a small area of Paddle grass(Halophila decipiens) between quadrats 1 &2 of this transect. The general area of grasses along this transect remained consistent with last couple of years and has expanded slightly from the original pre-dredging monitoring. Densities of grasses were higher throughout the entire transect compared to past years monitoring period. In addition to the grasses, oysters (Crassostrea virginica) were also observed along the mangrove fringe line. Oyster clumps (approximately 6 inches by 6 inches), upside- down jellyfish (Cassiopeia xamachana), lightning whelks (Busycon contrarium), fighting conchs (Strombus alatus), shell debris, and red, green and brown algae(Rhodophyta, Chlorophyta, and Phaeophyta)were also observed along Transects 1. Transect 1 80% ------ 75°n 70% - 60% 60% - L > 50% - c)) 40% - 30% 300/ - 25% v m 20% - 3 10% - 5% 5% 0% I I I 1 2 3 4 5 6 Quadrat Numbers(1-6) 28 of 50 Clam Bay Annual Monitoring Turrell,Hall&Associates,Inc. z December 2012 may. .4 ����> Shoal Grass(Halodule wrightii)(Transect 5) 1 Shoal Grass le wrightii) 29 of 50(Halodu Clam Bay Annual Monitoring Turrell,Hall&Associates,Inc. December 2012 Outer Clam Bay: Transect 2 Transect two was also surveyed via snorkeling gear and wading. Water depths ranged from 6"to 3 ft.with visibility approximately 10-12 inches but like Transect 1 this was easily reduced if sediments from the bottom were stirred up. A small area of Shoal Grass(Halodule wrightii)was observed along this transect between quadrats 1, 2, and 3. The density of this grass has increased since lat monitoring period with the maximum 15%coverage and was mixed in with some Caulerpa algae. Caulerpa was also observed in other areas along this transect and throughout the system. In addition to the grasses, southern hard clams (Mercenaria campechiensis), and lightning whelks (Busycon contrarium) were also observed within this transect. Transect 2 16% 0 14% - 12% - L > 10% - O U 8% - t 4% a 2 0 0 - 0% 0% 0% 0% 0% 1 2 3 4 5 6 Quadrat Numbers (1-6) 30 of 50 1. Clam Bay Annual Monitoring Turrell,Hall&Associates,Inc. December 2012 Outer Clam Bay: southwest sector, Transect 3 Transect 3 was surveyed with mask and snorkel gear. Water depths ranged from approximately 2 to 6 feet. Visibility varied between 12 to 16-inches. The small patch of turtle grass (Thalassia testudinum) was observed along the western mangrove fringe line. This patch has been observed in the same location for the past several years and this year has noticeable grown in size from the last moni oring period. The patch would still be considered small however has just about doubled in size with about 10 to 20 erect shoots with 2 to 5 leaf blades each. The extent of the rhizomes was not explored for fear f disturbing the bed. In addition to the grass,both blue-green and red algae were present within the shallo s.There was also a lot of Caulerpa present in and around this transect area. Other observations made alon this transect included the Florida fighting conch, upside-down jellyfish and a few scattered oysters right a ong the fringe line of the mangroves. Transect 3 12% — -___-_. --- _ __ ____ _ 10% 10% - 0 m $% - > U 6% - 5% 5% c w 4% - L o a 2% - 0% 0% 0% 0% I I I I I 1 2 3 4 5 6 Quadrat Numbers (1-7) 1 31 of 50 Clam Bay Annual Monitoring Turret!,Hall&Associates,Inc. December 2012 Western side of waterway between pass and bay,Transect 4 Transect 4 was surveyed by both wading and snorkeling due to the varying water depths. Water depths ranged from 6 inches to 5 ft.with visibility of approximately 12 to 20 inches. The survey was conducted during low tide allowing the visual observation to be completed mostly by wading the entire transect. Large patches of Shoal grass (Halodule wrightii) were observed along the western mangrove fringe line, throughout most of this transect. Oysters were once again observed along the mangrove fringes on both east and west sides of the channel. Blue crabs (Callinectes sapidus), southern hard clams (Mercenaria campechiensis), and lightning whelks (Busycon contrarium) were observed scattered throughout this transect. Several fish species such as mangrove snapper(Lu Janus griseus),mullet(Mugil cephalus), and sheepshead(Archosargus probatocephalus)were also observed. Transect 4 60% ----- 50% 50% 50% 50% a m 40% - 35% U 30% - 25% 20% - 15% m 0- 10% - 0% 1% 0% 0% 1 1 1 2 3 4 5 6 7 8 9 Quadrat Numbers (1-9) 32 of 50 Clam Bay Annual Monitoring Turrell,Hall&Associates,Inc. - December 2012 s € € t � . Shoal grass (Halodule wrightii) Southern hard clam (Mercenaria campechiensis) 33 of 50 Clam Bay Annual Monitoring Turrell,Hall&Associates,Inc. December 2012 Eastern side of waterway between pass and bay,Transect 5 Transect 5 was surveyed by both wading and snorkeling due to the same varying water depths as transect 4 has. Depths ranged from exposed substrate inches to 6 feet. In the original monitoring efforts,both shoal grass and paddle grass had been observed along this transect. As the tidal prism changed with the dredging activities, areas where grass had been present became subjected to longer periods of exposure and so died out. Shoal grass(Halodule wrightii)was again observed along this transect,however compared to years in the past a denser percentage was documented indicating a net improvement.Shoal grass(Halodule wrightii) has begun covering the entire mud flat along the eastern shoreline indicating the surrounding bay could be finally rebounding from the historic dredging impacts. Mud snails were observed throughout as well as Florida fighting conchs were also seen scattered throughout the entire transects. Further continued monitoring will indicate if the return is permanent or not. Transect 5 100% - ,a — 90% -_ 80% - 75% 0 60% - c 40% - m a_ a 20% - 10% ° 0% 0% ■ - 0% 0% 0% 0% I I 1 1 t 1 I I 1 2 3 4 5 6 7 8 9 Quadrat Numbers (1-9) 34 of 50 Clam Bay Annual Monitoring Turrell,Hall&Associates,Inc. December 2012 Inner Pass, shoal area east of Clam Pass, Transect 6 Transect 6 is oriented north to south and covers a large portion of the shoal area just east of the Pass.This transect was surveyed by wading on account of the very shallow water depths which ranged from exposed substrate to approximately 4 inches. Visibility was not impaired. Large amounts of shoal grass(Halodule wrightii)were observed once scattered throughout the entire southern end of the flat,around quadrats 1,2,3, 4, 5, and 6, with new additional coverage just north of the transect near the boardwalk. This bed has increased considerable two beds present are in the same locations as last year though the density of coverage has significantly increased. The main change in coverage on this transect from the original monitoring conducted during the first annual report is that the grasses seem to have shifted more towards the center and away from the perimeter of the transect. Densities seem to continue to increase indicating a healthy thriving bed. Remaining portions of this transect consist of a sandy sediment with green mt algae, mud snails, and Florida fighting conchs. Trasect 6 100% -------------- 95% 80% - 75 0 0 60% 0 60% - 50% 4 40% - 30% V a 20% - 10% 15% II ME 1 2 3 4 5 6 7 8 Quadrat Numbers (1-8) 35 of 50 Clam Bay Annual Monitoring Turrell,Hall&Associates,Inc. December 2012 Inner Pass, shoal area east of Clam Pass, Transect 7 Transect 7 is oriented northeast to southwest and covers a large portion of the shoal area just east of the Pass. This transect like T6 was surveyed by wading and snorkeling due to the warring water depths which ranged from exposed substrate to approximately 4-feet. Visibility was not impaired. Large amounts of shoal grass (Halodule wrightii) were observed once again in the vicinity of the mangrove island, around quadrats 3 through 5. The large bed present is in the same location as last year though the density of coverage has increased. The main change in coverage within this transect from the original monitoring conducted during the first annual report is that the grasses seem to have shifted more towards the center and away from the perimeter of the transect. Densities seem to have increased over the past few monitoring periods,indicating a net improvement for this transect and surrounding area. Remaining portions of this transect consist of a sandy sediment with green mat algae,mud snails, and Florida fighting conchs. Trasect 7 90% - 80% 80% - 75% 70% - `m 60% - 50% 0 50% - 40% - c°' 30% - a 20% - 10% - 0% 0% 1% 1 2 3 4 5 6 Quadrat Numbers (1-6) 36 of 50 Clam Bay Annual Monitoring Turrell,Hall&Associates,Inc. - December 2012 Inner Pass, southern section of channel and shoal area, Transect 8 Like T7,Transect 8 is oriented northeast to southwest and crosses both the channel and the two shoal areas. The survey of this transect was conducted by both wading and snorkeling the survey line. Water depths ranged from exposed substrate to 4 feet with a visibility approximately 2 to 3 feet i the deeper portion of the channel. Shoal grass was observed on the east side of the channel in the shallowe water depths,in the same areas as T7 and T6. This seagrass bed has increased slightly in size and density ze an the original monitoring efforts. The small patch of shoal grass observed two years ago on the west side of the channel has not returned, most likely due to sand build-up allowing this area to dry out during low tides. Densities have increased from the 10%to 45%coverage within the footprint of this transect whicli was observed last year to around 10%to 95%within the entire seagrass bed area and not just within this transect. Large groups of mud snails, a few Florida fighting conchs, and small patches of algae were also observed. Trasect 8 45% , ••o 40% 35% 35% 0 30% 25% 0 25% 0 0 20/0 15% w 15% i a 10% o = 5/0 0% 0% �� 0% 1 2 3 4 5 6 Quadrat Numbers (1-6) 37 of 50 Clam Bay Annual Monitoring _ Turrell,Hall&Associates,Inc. December 2012 Seagrass Summary Seagrass coverage overall totaled 4.43 acres within the Clam Bay system appears to have decreased since the surveys conducted immediately prior to the dredging in 1998. What has been shown by the past twelve years monitoring is that there was a decrease in the monitored seagrass beds immediately following the initial(1999) dredging activities. This decrease appears to have stabilized around 2004 or 2005 and has reversed in the past few years to where the grass beds are re-establishing previous areas and new areas appropriate for the grasses(in terms of water depths and light penetration) are being colonized. Future monitoring of the seagrasses will be conducted to see if this trend continues. Water Loggers Three continuous water level monitoring loggers were deployed in the system this year. These instruments help us to see how water levels within the mangrove forest react to tides and storm events. The graph below shows the water levels within the forest in comparison to the rainfall recorded within Pelican Bay during the same time period. WELL AT NORTH END OF CLAM BAY Water Depth Rainfall 1.500 5. 5.250 5 1.250 5.00 4.75 1.000 - 4.50 - 4.25 0.750 a.©0 3.75 x W 0.500 LI_II! 3.25 Z tt 0.250 3.00 L 2.75 p 0.000 It S 2.50 J Q -0.250 r i 'il ( 1 1 iiu,� ilk l i l 12:25 Z III Q • �1 I k i1 �fi!fil Nil; i LIi I k 1.75 a -0.500 . •. J ��►11 ,����'��'I�� , I'� �I�i ril�I. ' ._ x:25 r -0.750 � ! „�« 1.0 • � "• •. .1I4iIII '•a. .`• 0.75 0.50 -1.000 .::::::l • :f.- Z: :s 'f' : Y5, «: : .+::: 0.25 -1.250 • . - _s_ _, .� __s- ;�,I__ — _�__.2 _�. . ... .: , 0.00 aZ n ' Q7. 1 l ". . :Li N M tin t`e ^ oc O_i Is- 38 of 50 Clam Bay Annual Monitoring Turrell,Hall&Associates,Inc. December 2012 WELL AT STATION #7 W ate r Level Rainfall 2.000 MI •IIIIIIIIII IIII 5.50 5.25 1.750 illin ii 5.00 1.500 4.50 1.250 __.... re 1 . 4.25 - 43..0705 =in Lu LI 1.000 ; L.) 3.50 z L., I i 0.750 1 rIll I IIIIIIII 1 Z ct - 3.00 al : I- 4.1 0.500 vimailifriaira * • 2.75 0 -.-- -----; 2.50 -.•* . _., cl . 1 ' i i i ill i c4 0.250 , 2.25 a, 11111.141111E i 111111htli111111111 . 111111.1111 111 .. LIME BI 2 00 u_ 0.000 '11111511111"111111"11.111111111.111.1.111.111111111116M1111.11.11111M.91111111111Wirllaff Min, . Z IIMIVEltilllar.741.1 ararMom a MIN iti '1Eli litilirili 1, 1.7s.g < -0.250 = IF_ Mil •Mr11.11. r In II I TV II !BB IMP"! VIII:11111 125 c` NIT IL IL"ITill',Iill i t lir MIL* BEILIIii 311 1:00 -0.500 :MIREVAIMIMIEd"nillii.# IIW i LI UM t. in i II IlLa I di ;.E118,1141,1411111 (1 :t1 T. ., 1 tIMEE111111161■111■111■■11■1111.11" I r :um .. :... ,- ., • : 35 -0.750 - ..., • ....„ .. .. , . • • - ---,--- ,. . 0,50 , - . .. : :-..t ••e• • ; :- i-..1 ., t:I .F. f.-- --I--3-• : ::N. 'Zt .-..,'-'; fl... -.6- 11:- ,...r. 0.25 _1.000 f=..:... .=Z.' ...:. _ __:....-...e_. . I.:- _____.Z.------..-: -=I---`........E.,-: •-....1-.-•2•*--,.......I.Z., l'..-_•.-........:.::. 0.00 g g g g 741 ;::I 7-1 N N N N N N N N N N „ ..._ „ „ „ „ „ .... , „ „ „ , „ „ • 41 ge, LA 74 g 7.1 m N N N r.1 N gl A' ,s4 CO CO „ „ „ ..... „ „ „ • „ „ft_ -.... „ LO As. CO Ch 2 ;1 t,11 .-I ANI CO Ad- VI AM N. 00 C 0 h r-I WELL AT SOUTH END OF CLAM BAY Water Level Rainfall 1.500 1 IIIIIIIIIIIIIIIIIIIIIIIII ' NMI 5.50 1.250 111 If moll smal 5.25 5.00 4.75 1.000 iiiillEMili Illiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii iligniM 4.5° 0.750 imo■unimria-mimim ommonmiummiwommommummommimmumws mom •m= 4.25 EERIE Mil iiiiiiiMMIMiiiiiiiiiiii-- iliFilliLIMMIIIMIII 4.0° 4L13 0.500 3.75 x ormi 5 0 •mi al.trimmiwaimi, == mil ma,rainimii, , . t.0 3.50 s'Z' 0.250 PI'NE I III RI 1111/11111■1111■11111■Iii EIME•1111111■11 N II= 3.25 , c:... 0.2uu i • !!iri i 1•1 Timm , NB TO TN IN III EMI lil MEM 3.00 al .u.1 0 000 I 1 rl i t Ai MI i pir 4 ' Fir TA iv 1.7 a 2.75 1 t i A IC 11111110i di Mit 1 • i li II III I II I MI 2.50 I- cc -0250 i I A likb lid IMIIIIIIIIIN NMI 'WI kill NI NM it:41 NI IAA I It illnllr. 2.25 --j - • M. i 1 MI ValyplItIlifir 111111 ItiliMNIEB 1■11111 2 00 5•< -0.500 ..... ' -.Pi ,. MUM Jil , ., Lir IIM 3:75 M 4 ' • puiterirluillalai ' tomilliii.i I II: - zi -0.750 ... romp Ira= NMI& 11111 41•11111.1111111111111111 +. + INN it tot • . 1.50 1.25 BAI„ NiMililliiiiIMMEMIEnall , 1.00 _1.000 ..._ wvolly.rommonmarawraumen _ • ..__ . tau9C41lRIIIIIIIIIIIIIMIIIIIIIIIIIIIIII31111113111111111PMIIIIIII . ele:sn'irsim""" •, 1 0 75 • 1111111118■3■11■■■=111■1111■11■11 . ,311■1131■1 ::::' 0.50 -1.250 •.0::. .. M : ME . IMUNIIIIIIIIIIIIIII.:_ $Efin*.:, % •• •• - . ':'-'• : -1.500 -...-*_*1-I i :_.: _rt Pala UM Mall MEM- • • - ___ ' i ;;;_:::::..1-• - -;,"11-:-. ' 00:02g 7-1 7-1 7:11 el :71-1 :-'ll N N N N N fl N N N 4 gi 7, * . ••• r9 -i c9 (9 -.'' --. 4 1;4 --1".4 ri 1r4 t-I ..-t 39 of 50 Clam Bay Annual Monitoring Turrell,Hall&Associates,Inc. December 2012 The fluctuations in levels depicted shows that the system does receive elevated water levels after heavy rainfall events but quickly returns to normal levels. This is an indication that the water flow and flushing capacity of the system is still functional. Tide Gauges The tidal data and flushing analysis for the bays and main waterways within the system is presented under separate cover in a report from Humiston and Moore Engineers. Water Quality Testing Water quality sampling is conducted within the Clam Bay system on a monthly basis. Readings for the month of November 2011 were not collected and so were not included in the comparisons. Water quality samples are collected by PBSD staff and transported to the Collier County Pollution Control laboratory for processing. All of the sampling data are not included in this report due to volume of pages making up this information. Sampling information is available for review and inspection at the PBSD offices. Field notes,chain of custody records,and laboratory reports are included in this data set.Of the parameters sampled and collected,dissolved oxygen(DO),nitrates(NO3),orthophosphates(0PO4),and total dissolved solids(TDS)are discussed below. Discussion on these parameters is provided because they are the most indicative of nutrient loading and other potential water quality problems. The enclosed graphs show monthly averages in the discussed parameters over the last year. This year's testing did show that most parameters are still reacting as expected and the storm water management system appears to be doing its job by tying up or removing nutrient and pollutant parameters before they reach the Gulf of Mexico. 40 of 50 0. • Clam Bay Annual Monitoring Turrell,Hall&Associates,Inc. - December 2012 Parameter Label Units Maximum Maximum Purpose of Sample (Name) Contaminant Contaminant Level(MCL)Class II waters Level(MCL)Class III waters (fresh) TEMP Total Temp.limit=Ambient+AT Total Temp.limit=Ambient+AT Measures water temperature Water Temperature °C June—Aug.AT 1.11°C w/Max.T=33.3°C AT<1.67°C w/Max.T=33.3 Sept.-May AT<2.23°C w/Max.T=32.2°C °C Affects aquatic organisms as well as AT and T converted from°F to°C AT and T converted from°F to°C limiting/aiding chemical reactions COND pl/cm Not more than 50%above normal Measures conductivity indicator of Conductivity N/A background or 1275,whichever is water quality changes greater pH Standard Not more than 8.5 Not more than 8.5 Measures acidity/alkalinity of the water (0-14) Not less than 6.5 Not less than 6.0 Indicates the ability of the system to support life TDS mg/liter I Measures the amount of dissolved Total Dissolved Oxygen N/A N/A solids in the water Dissolved solids are minerals and chemicals such as salt DO mg(oxygen)/liter Not less than 5.0 in a 24 hr period,and never Not less than 5.0 Measures the quantity of oxygen in the Dissolved Oxygen less than 4.0 water Low levels indicate the potential for an algal bloom NH3 mg(Nitrogen)/liter In no case shall the nutrient concentrations be Measures the amount of soluble Ammonia altered to cause an imbalance in natural <0.02 ammonia in the sample populations High levels indicate the potential for an algal bloom NO2 mg(Nitrogen)/liter In no case shall the nutrient concentrations be In no case shall the nutrient Measures nitrite content Nitrite altered to cause an imbalance in natural concentrations be altered to cause High levels indicate the potential for an populations an imbalance in natural algal bloom populations NO3 mg(Nitrogen)/liter Measures nitrite content Nitrate N/A N/A High levels indicate the potential for an algal bloom TKN mg(Nitrogen)/liter --- Measures amount of ammonia and Total Kjeldahl Nitrogen TKN/TOC<15 TKN/TOC<15 organic bound nitrogen in the water Necessary to establish amount of organic bound nitrogen in system OPO4 mg(phosphorus)/liter In no case shall the nutrient concentrations be In no case shall the nutrient Measures orthophosphate content Orthophosphate altered to cause an imbalance in natural concentrations be altered to cause High levels indicate the potential for an populations an imbalance in natural algal bloom populations TPO4 mg(phosphorus)/hter In no case shall the nutrient concentrations be In no case shall the nutrient Measures phosphate content Total Phosphate altered to cause an imbalance in natural concentrations be altered to cause High levels indicate the potential for an populations an imbalance in natural algal bloom populations BOD mg(oxygen)/liter Shall not exceed valises that would cause Shall not exceed values that would Measures the oxygen demand Bio-Chemical Oxygen dissolved oxygen levels to be depressed below cause dissolved oxygen levels to High levels indicate a potential Demand limit established for each class be depressed below limit depletion in oxygen content in the established for each class system SALINITY mg(Chloride)/liter Not more than 10%above natural background Measures salt content in the water Salt conditions N/A Indicates salinity of the system TURB NTU(Nepthalometric <29 above natural background conditions <29 above natural background Measures amount of suspended solids Turbidity Turbidity Units) conditions in the water Indicates the clarity of the water in the system SIO2 mg(silica)/liter In no case shall the nutrient concentrations be In no case shall the nutrient Measures the amount of silica Silicates altered to cause an imbalance in natural concentrations be altered to cause Silica is necessary for the survival of populations an imbalance in natural the primary phytoplankton in an populations estuary CHLA mg(Chlorophyll)/liter Measures the amount of chlorophyll A Chlorophyll-A N/A N/A Indicates phytoplankton biomass in the system PHAEOA mg(Phaeoaphytin)/liter Measures inactive chlorophyll Phaeophytin N/A N/A To establish a true chlorophyll count it is necessary to know phaeophytin TOC mg(Carbon)/liter TKN/TOC<15 TKN/TOC<15 Measures the concentration of Total Organic Carbons carbonaceous material in the water Assesses the potential amount of oxygen demanding matter in the system 41 of 50 rIi► Clam Bay Annual Monitoring Turrell,Hall&Associates,Inc. -_ December 2012 Dissolved Oxygen(DO) Dissolved Oxygen is a measurement of the amount of oxygen available in the water.Aquatic life depends on oxygen in the water and low levels can be an indicator of poor health of an aquatic system.Outside influences such as temperature, wind, and rainfall can all affect DO. Here in southwest Florida DO levels are typically higher in the winter months when rainfall and temperatures are both lower than in the summer months. The measured DO levels are generally higher this year than they were last year but they still fall below the state standard of 5 mg/1. It should be noted that the readings collected are one time collections and not the 24 hour diel study that would be done as part of a more formal dissolved oxygen study. Time of day can greatly influence DO readings and if concerns are expressed over these results, additional collection could be done. There have not been any indicators of dissolved oxygen depletion(such as fish kills or algal blooms)in the Clam Bay system for the past couple of years so we are not overly concerned about DO levels at this time. 42 of 50 Clam Bay Annual Monitoring Turrell,Hall&Associates,Inc. December 2012 Average Monthly DO Levels 10.000 9.000 8.000 7.000 s O -4—W6 6.000 ,70,14 5.000 j `�►r�`. \ ?f►�W-7 4.000 0 3.000 W-1 2.000 UCB 1.000 N Seagate 0.000 y '� , ,y '.� .ti ,L ,L 1 '4,1' c oe�' ‘46: �� Sam �e.9 a� PQ� �a� ,J� ��� PJao Month-Year Average Monthly DO Levels 10.000 9.000 Eir 8.000 c 7.000 - ' m 'R T 6.000 O '. mss ,� �' t P B 11 5.000 ,�� Ef. �� i � �� ts,►��` `FFSt. Lucia 4.000 O 000 j /1 /1_ uY 3. { 2.000 � \� Glenview 1.000 E PB 13 0.000 -- cle' o�� �o, Oe� �a� �¢� �a� PQi \S\ JN ,J� J� Month-Year 43 of 50 Clam Bay Annual Monitoring Turrell,Hall&Associates,Inc. December 2012 Nitrates (NO3) Nitrates are nutrient components that are most often associated with fertilizers or vegetation decomposition. Excessive levels can lead to algal blooms, decreased DO levels, and decreased viability of the system. In freshwater or estuarine systems close to land,nitrates that reach high levels can potentially cause the death of fish.While nitrate is much less toxic than ammonia or nitrite,high levels can inhibit growth,impair the immune system and cause stress in some aquatic species. In most cases of excess nitrate concentrations,the principle pathway of entering aquatic systems is through surface runoff from agricultural or landscaped areas which have received excess nitrate fertilizer. These levels of nitrate can also lead to algae blooms, and when nutrients become limiting(such as potassium,phosphate or nitrate)then eutrophication can occur.As well as leading to water anoxia(lack of oxygen), these blooms may cause other changes to ecosystem function, favoring some groups of organisms over others. Nitrate values continue to fluctuate widely between sampling station and no appreciable trend is apparent.It is clearly apparent that waters within the development itself,Sample locations St.Lucia,E PB 13,PB-13,and to a lesser extent,PB-11,average higher values than the waters of the estuary.It is also clearly apparent that these higher average values are the result of one or two high readings during the year. E PB 13,PB-13, and the St. Lucia stations have periodic spikes in nitrate levels through the year.It is extremely interesting to note that these spikes correlate very closely with spikes observed for the past couple of years. While it has not been absolutely verified that these readings correspond to times of fertilization at any one location it is still considered probable that this is the main cause of the periodically higher results. The fact that the readings are higher in the development area than in the preserve is still a good sign in that it means the water management system and the vegetation between the berm and the pass is working to take up nitrates out of the water column prior to it going into the Gulf. Average levels are not extreme and as stated above,the water management system seems to be doing its job in removing this nutrient component before it reaches the Gulf of Mexico. 44 of 50 Clam Bay Annual Monitoring Turrell,Hall&Associates,Inc. December 2012 Average Monthly NO3 (Nitrate) Levels 1.00 - _. 0.90 0.80 2 0.70 Q0.60 —4—W6 ii 0.50 - E 0.40 8 0.30 O 0.20 - UCB 0.10 N Seagate 0.00 NN" titi titi yti 'y' ti� �� y� 1ti ti� ti� ti� 5eQ O`er Oe` ,a‹ Few' a` Q` aJ J� J\ PJ% Month-Year Average Monthly NO3 (Nitrate) Levels 1.00 —.._ 0.90 I 0.80 - 2 0.70 ` t _ o a 0.60 -_-- = 0.50 g 0.40 ( ; —it-FSt.Lucia 0.30 1" :;:iew-- - _a0 /,� 0.10 k +. r E PB 13 0.00 1+•`w�"+ WOIrli , . . °, pe Nam <<e'9. 4`.° QQ �9;\ Month-Year 45 of 50 mow a Clam Bay Annual Monitoring Turrell,Hall&Associates,Inc. December 2012 Phosphates (OPOaI Phosphates are nutrient components like nitrates that are most often associated with fertilizers.Like the nitrates, excessive levels can lead to algal blooms,decreased DO levels,and decreased viability of the system. However, because phosphorus is generally much less soluble than nitrogen,it is leached from the soil at a much slower rate than nitrogen. Consequently, phosphorus is usually much more important as a limiting nutrient in aquatic systems and increased levels can more drastically influence algal blooms or other eutrophication processes. Ortho-phosphate values also fluctuate widely between sampling stations however the trend that started to become apparent in the past may still be progressing. It appears that waters within the development itself, especially sample locations PB-13,and St.Lucia are trending towards higher phosphate levels.There is a lot of fluctuation but for these sites, the highs keep getting a little higher and the lows don't go as low as previous drops. The monthly pattern seen in the nitrate samples was not as apparent in the phosphate samples but, Glenview,PB-1 1 and the St.Lucia stations show phosphate spikes that correlate inversely with Nitrate spikes. As with the nitrates, the water management system and the vegetation between the berm and the pass are working to take up this nutrient out of the water column prior to it going into the Gulf. 46 of 50 Clam Bay Annual Monitoring Turrell,Hall&Associates,Inc. December 2012 Average Monthly OPO4 (Ortho-P) Levels 0.60 0.55 ._. 0.50 — y 0.45 0 0.40 r c 0.35 —4—W6 . 0.30 a. 0.25 —3h-W 7 0.20 —F--W-1 0.15 1111rilMilkii.__ A O 0.10 UCB i �1' "- - � � N Seagate 0.05 —°°°° 0.00 , ° se9 o� \464 ,e` 1 ke' �a� Tof 4,aJ J� >J\P o� Month-Year Average Monthly OPO4 (Ortho-P) Levels 0.60 0.55 0.50 N0.45 c 0.40 a 0.35 s 0.30 —f—PB 11 °q 0.25 A / —e—FSt. Lucia 0.20 � _-1�1 �4--PB-13 0.15 Ei_k ;, --t 0.10 �. 0.05 r "‘;, x 0.00 — — . N. N. tit N N N N N N N N c eQ O>: \o pee ac <<ea 4,'§' QQ� 4,21, >K \• PJ% Month-Year 47 of 50 Clam Bay Annual Monitoring Turrell,Hall&Associates,Inc. December 2012 Total Dissolved Solids (TDS) This is a measure of the mineral and salt content of the water.Total dissolved solids are normally only discussed for freshwater systems,since salinity comprises some of the ions constituting the definition of TDS.In brackish or saltwater systems, the higher the TDS content, the saltier the water. TDS is not generally considered as a primary pollutant(e.g.it is not deemed to be associated with health effects),but it is rather used as an indication of aesthetic characteristics of drinking water or as an indicator of the presence of a broad array of chemical contaminants. As with past years,this parameter was within the levels expected. The freshwater sampling stations showed low TDS levels while the estuarine sampling stations showed higher levels. In general TDS values have changed little over the monitoring period. 48 of 50 Clam Bay Annual Monitoring Turrell,Hall&Associates,Inc. December 2012 Average Monthly TDS Levels 60000 • 50000 a 40000 o W6 30000 / W-7 t2 20000 W-1 c - UCB 10000 N Seagate 0 titi ,yy 'y,' ti "Q"O c1' <1'' c e, - e lac � lac Q�' aJ ,„, SJ� PJpO Month-Year Average Monthly TDS Levels 60000 50000 E 0 40000 —M—PB-11 B 30000 - f-FSt. Lucia O 20000 -- -- -44—PB-13 —0—Glenview g 10000 Glenview VAR -f-E PB 13 e9 & ,` o iaV � � 5 o ° <C Q ‘,1<-4' Month-Year 49 of 50 2 Clam Bay Annual Monitoring Turrell,Hall&Associates,Inc. December 2012 Summary Since the final original permit required monitoring report in 2008,the past restoration activities have continued to yield positive results within the mangrove forest of Clam Bay. The majority of the monitoring plots show continued increases in mangrove numbers and sizes. Two plots(Plots 4 and 9)have been consistently hampered by exotic vegetation and very dense ground cover growth. Ongoing exotic eradication activities will allow for the eventual re-establishment of natural native vegetative community within these areas. Borer damage is being monitored to determine if it was an isolated outbreak or an ongoing issue. Continued vigilance will be maintained to see if additional infestation occurs in healthy trees instead of just the already stressed ones. Continued annual inspection of the flushing cuts throughout the system will be continued. These cuts are vital to the continued health of the system and must be maintained so that the water flows and flushing capabilities of the main waterways is protected. This years monitoring has shown that the system continues to recover and both mangrove and seagrass recruitment have been documented. While the success of work efforts to date is undeniable, continued vigilance is called for to maintain a viable functioning ecosystem at Clam Bay. Stress in mangrove forest areas is still apparent,although in several areas this may still be attributable to storm or cold damage. The spectacular recruitment of white mangrove seedlings, now 8 to 10 feet tall saplings, throughout the original die-off area is testament to the efforts undertaken with the initial dredging and that work can be considered a success. 50 of 50 iT 2 F i M,_ W - �`1�.Z ... - N a 7- A , i x - , 3 F -, ,‘.,,;,- ' -. ;-, ' 1 ''''l 1*- - ' i d y, * +° S k 4 Trql "aww .la, '., a.;. - j1 t , '.11.4....,:t a r � D . --,...r, t w { +.at .j: n+v -r`„! x, I.ar �ref .z'Y `t' 1<r ♦, 4 z i ,•�... a 1 SE r n aw ( , i -®krr N n v n i3.. O h *"t, _ -. °_ Fl iii _ � r m O W co co \ `P t'‘,$-`,W:,, , '', ,--.' ', ., (0) o)•_0 L. -,to 1} O CC W W m0 O te Na U d W CL ›-m0 J 0 _ 0 [1:1 0— ! a Z o W w re H Z co Q {en a. Q 1 114 in° J a awl <z U. 11, co NCO z? z o w Z 0 ¢z Q o a WO 1- C9 v o� � 0 RI-Q -Is g to ��� ITJII J o IIIIII 0 ��fiXe � •-i- L.11 irl�.r,,� a 3 m0. 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AIM 4,, ' ' .4 1, . 2 . _. , ,.., . , .,,,._ ..,_ . , , .., ,r ,. . t. i ,Ya.ss at!*•.±1 --"t4 Ir'6"t,.:�; .� :< ' F fa. s r w C 1( dra J „ . , . i.,,,. ,.-11. : - -10.--- -- t- c' * --: , --AA 1 t9 0 O t f w •p f *4 t f” I. �Jt t '[ trl t 1 a.a it y,-, s � µ � �U :1 , 4' --art -* I I. t` ; 17. u J u a g# d rf x g g a.Jk r i.ti w , i � -,....k, ��yy •a 311 ' .. , ; %`"a•,t 1 c '' bi cf a'� 5 > ° t t t- CLAM PASS ANNUAL RESTORATION & MANAGEMENT PLAN TIDAL ANALYSIS ELEMENT REPORT NO. 13 Submitted to: Pelican Bay Services Division Prepared by: Humiston & Moore Engineers H&M File No. 13-078 November 2012 HUMISTON Main Office: MARE 5679 Strand Court ENGINEERS Naples,FL 34110 COASTAL Phone 239 594 2021 IMMURING DESIGN Fax 239 594 2025 AND PERMITTING CLAM PASS ANNUAL RESTORATION&MANAGEMENT PLAN TIDAL ANALYSIS ELEMENT REPORT NO. 13 HUMISTON& MOORE ENGINEERS H&M FILE No. 13-078 November 2012 Table of Contents 1. Summary 1 1a. Recent Significant Changes. 2 2. Background 2 3. Tide Phase Lag 5 4. Tide Range 8 5. Conclusions and Recommendations 12 6. Channel Entrance Width 15 7. Recommendations for Ongoing Monitoring. 16 8. References 16 List of Figures Figure 1: Gage Locations 4 Figure 2: Low Tide Phase Lag 6 Figure 3: High Tide Phase Lag 7 Figure 4: Low Tide Phase Lag Annual Averages 9 Figure 5: High Tide Phase Lag Annual Averages 10 Figure 6: Tidal Ranges 11 Figure 7: Tidal Ranges Annual Averages 13 Figure 8: Low Tide Phase Lag vs Pre-Dredge Conditions 14 CLAM PASS ANNUAL RESTORATION&MANAGEMENT PLAN TIDAL ANALYSIS ELEMENT REPORT No. 13 1. Summary Analysis of tidal data has previously been presented in annual monitoring reports that also included analysis of changes in the bathymetry of the waterway and the beach shoreline. Bathymetric changes in channel shoals and tidal analysis both provide information that is useful in determining when maintenance dredging of the inlet should be considered in order to maintain flushing. Beginning three years ago there was a change in County policy and this tidal analysis is now being provided as a separate report from the bathymetric and beach monitoring. For a history of the comprehensive bathymetric, beach, and tidal monitoring, see "Clam Pass Restoration and Management Plan Bathymetric Monitoring, Reports"#1 through#9, 2000 through 2008, prepared for the Pelican Bay Services Division (PBSD) by Humiston & Moore Engineers (H&M). This is the fourth monitoring report that is limited to the tidal analysis only. For information on bathymetric monitoring refer to the separate County reports. The Clam Pass Restoration and Management Plan was implemented in 1999 to improve flushing of the Clam Bay system and the surrounding 570 acre mangrove preserve. A part of the management plan was to dredge portions of the flood tidal shoal and some of the interior waterways to improve the hydraulic efficiency of the inlet and increase the tidal prism, which is the volume of water exchanged through the inlet on each half tidal cycle. The improved tidal prism means more water goes in and out of Clam Pass on each tidal cycle, and this larger volume of water generates stronger currents in the inlet. Those stronger tidal currents are capable of scouring sand from the channel to help keep the inlet open and maintain the flushing improvements. Since the 1999 dredging, as shown in the annual Clam Pass Restoration and Management Plan Reports #1 through #9, implementation of the dredging element of the Clam Bay Restoration and Management Plan has significantly improved tidal exchange throughout the bay system. The maintenance dredging of the flood shoals in January 2002 was shown to be beneficial in maintaining the improved tidal flushing. In order to maintain the improved tidal exchange, based in part on the results of the tidal monitoring, the 2006 monitoring report recommended dredging of the entrance of the pass, and a portion of the flood shoal. That dredging was completed during the winter of 2007. The County has submitted an application to dredge the pass in the near future. The limits of the currently proposed dredging are the same as the limits dredged for the 2007 maintenance. The proposed placement of the dredged material, however differs from the 2007 project in two ways. The County is seeking to place fill on both the north and south side of the inlet, including infilling of the meandering channel entrance on the north side of the entrance dredge cut. 1 1a. Recent Significant Changes The previous annual monitoring report indicated that there was evidence of shoaling that was restricting flow at the inlet, however, not to the extent that was used to justify each of the two previous maintenance dredging efforts. However, the most recent tide data indicates that recent storm events have resulted in the most severe restriction to tidal flow that has occurred since implementation of the Restoration and Management Plan in 1999. Over the past year the Clam Pass System has been affected by two tropical systems, Tropical Storm Debby in late June and Tropical System Isaac in late August. These two systems sent large waves to the coastline and caused significant beach erosion, caused shoals to shift including formation of the spit at the entrance of Clam Pass which migrated north, and possibly caused an influx of sand to the interior shoals. It is the accumulation of sand in the interior shoals that causes shoaling that the inlet tides are unable to scour from the channel, and this therefore is the accumulation that makes dredging necessary. After the passing of these two systems, the data reflected a decline in tidal flushing within the Clam Pass system, indicating a strong possibility that sand did accumulate in the shoals along the interior portions of the channel. This decline in flushing indicates that there is extensive shoaling that is restricting flow between the Gulf of Mexico and the interior waterways of Clam Pass. The extent and location of the flow restriction would dictate the necessity to dredge. A small restriction located near the entrance to the inlet could cause temporary reduction in flushing, but overall the system could naturally recover through self scouring, which would restore adequate flushing. This has happened in the past. If the restriction is more extensive and extends far into the interior flood shoals, it would likely require a dredging to restore the flushing,which seems to be representative of the current condition. Although a hydrographic survey is required to determine the exact location and extents of the shoaling, the degree of restriction to flow demonstrated through analysis of the tide data indicates it is quite likely that dredging is necessary. Furthermore, it has been 5 years since the previous dredging which is consistent with previous maintenance intervals of 4 to 5 years. The maintenance dredging interval, however, remains very much dependent on weather events that occur between maintenance dredging events. This is why it is always recommended that the tide data presented in this report be considered in conjunction with hydrographic data in evaluating the need for maintenance dredging. 2. Background Prior to the commencement of the March 1999 dredging, water level recording gages were installed at selected locations within the Clam Bay estuarine system and Gulf of Mexico to measure tidal ranges. Tides along the southwest Florida coast are mixed, meaning that they exhibit either diurnal (one tide per day) or semidiurnal (two tides per day) characteristics at different times during each month, primarily dependant on the phase of the lunar cycle. There are seasonal variations as well. Pre-construction tidal data were collected for a full month to obtain average values representative of the general tidal characteristics for Clam Bay, and to establish baseline conditions against which post construction monitoring data could be measured to quantify improvements to tidal flow. The 2 locations of the gages are illustrated in Figure 11. This tidal monitoring program has been implemented through a cooperative effort with tidal data collection by PBSD, and data analysis and report preparation provided by H&M. Considering the mixed tide characteristics of this area is important for the tidal data analysis, because during the neap tide part of the month when tidal currents are not particularly strong, the inlet may take on wave dominant characteristics and appear to be shoaling near the entrance, particularly if the neap tide coincides with high wave energy events. During the ensuing spring tide roughly two weeks later, however, tidal currents are considerably stronger and may efficiently scour out shoals that formed during the neap tide interval. Short term channel shoaling and scouring that occurs in this manner causes short term variations in phase lag and tidal range data. This process therefore explains much of what appears as scatter in the phase lag and tide range data. However, when shoals are scoured out of the inlet channel, some of that sand is deposited on the ebb shoal restoring it to the littoral system which is the sand supply for adjacent beaches; however, some of that sand becomes redistributed as net accumulation onto the broader interior flood shoals. It is this net accumulation on the flood shoals over a period of years that eventually leads to the need for maintenance dredging. The purpose of the monitoring program is to evaluate inlet characteristics on a comprehensive long term basis, with less emphasis on day to day, week to week changes, or even month to month and seasonal changes. Because of the dynamics of this system, the findings of this report provide a reliable evaluation of project performance which, at times, may not seem consistent with visual observation of inlet conditions over relatively short time intervals, particularly conditions that may be observed during or immediately after a storm. Although the short term dynamics of the system may explain data variability or scatter, this is most effectively verified when coincident bathymetric data is available to quantify short term shoal and scour patterns. However, with the exception of several surveys that were conducted to evaluate post storm conditions during years immediately following the 1999 dredging, bathymetric surveys are typically conducted on an annual basis whereas the tide data has been collected over intervals of several months, with as many as six data sets in a year. This provides only limited opportunities to verify short term changes in tidal data with bathymetric data that may be used to document short term shoaling patterns. The accuracy of the data has therefore been carefully considered with each monitoring event, particularly on occasions where data variability appeared to be beyond what might be considered normal and reasonable for this dynamic system, and quality control over the thirteen years of this monitoring program has included periodic recalibration of gages by the manufacturer when data scatter appeared to be inconsistent with reasonable ranges of variability. These fluctuations might also be better explained by more comprehensive data collection. This is why it has previously been recommended that redundancy be introduced into the tide gage data collection program. Deploying two gages at each location would also allow for verification of data, to provide confirmation that each gage was working properly during the data collection interval. This would reduce the potential, for example, of bio-fouling resulting in compromised data, which has been known to occur when bio-fouling of gage sensors has apparently contributed to inaccurate 1 The tide gage located at the north end of Outer Clam Bay is located on the boardwalk between the Waldorf Astoria Hotel and Clam Pass Beach Park.This was referred to as the Registry gage in previous reports,and that convention is maintained in this report for consistency. 3 J A1.4,4. k ,, UPPER C LAM�L . f ~ UPPER '� . t, CLAM BAY TIDE � � �� BAY GAGE ■ v +mow?"y l *•r+ M r k ` 0 ,....r- .. „`� r �"a""�A'jt.�,�v+, ,,' i, '^'71,Y 3.F ,3 st 4,, c .y i9: n :;00 120,1` '1-� � x T. rpy'�� '.. �. t fie 'SC:ALF: 1" = 1200' i 'TT' NORTH BEACH '' . ., " '' FACILITY BOARDWALK 1 `. , TIDE GAGE AERIAL PHO1 OGRAPH WAS T.KEN;N lS" + r v r_ r ..:;1,4`,4t a DECEMBER 2010 AND IS PROPS R I Y OF ' —36 I '`' j % 4" ,,' r*:4 COLLIER COU fs,, i 4 ‘:* `1,4' P1►. ? i ` 11.,E c ,* . .. .. ; INNER -," ,tf' 4ti OF N,�` s.r4 ftt 4174/0' '''—‘41,,,,'414„t k :4:44.......,11"' I' f4.-41 itt#11%:49''°- „.. 1.1.42 .. , , 0 ...,,f ,. ..., , ‘: _ r.(v/...c,_ 1j,,!ilk' ,,:,..4,44 N „.. .,A,...,:?,,, z, ....,:_,,,:;44.:, 14,,,-1� �i,` Y Al SOUTH BEACH '.e'4W —FACILITY BOARDWALK R-40 TIDE GAGE as w / -5. - 44 ifr.a#46., t r A .,, Rim. 44 , )r� NOTES; i {- a ..r sr t, 1. THE TIHECAGFLOCATEt AT THE NOR IHHE:v " ". �' REGISTRY �'. Of OUTER CLAM BAY f LOCATE])ON l Ht � BOARDWALK BO R e ALKBE ,Erg s�EWA DO € R-42 o '� ASTORRA HO1EL AND CLAM P=ASS ;,,s, I, �. � TIDE GAGE s, °t PARK.TI US WAS REFERRED i O r'\S TI I id:::::REGISTRY(AGE IN PREVIOUS REPOT AND "' ' r Q T"HA'1 CONVI N'rIf3N IS MAINTA<N#-i iN 1,-Il „ t z _.. f REPORT FOR CONSISTENCY ' ~ . ,'«.0± ? F 1t2 �ip3J a"l . 1 Atli{Al k"' {{ ;il( feAE'i1'v'i�$ i KkN t ',' 0 t. *- 4 j�x• ri, DECEMBER 2010 AND IS PROFERTY OF 1 �S ' * / "1. f't� ` o " F. COLLIER COUN!Y APPRAiShhS OE1IC . ' ► ._ . r ' , 'v _ I`HUMISTON CLAM PASS 5679 STRAND COURT ". 1 MOOR, TIDE GAGE LOCATIONS NAPLES, FL 34110 i;'. L NGINEERS FOR: PBSD FAX: (239) 594-2025 i, , AS DATE: 11/1 6/1 2 FILE: SITEPLAN SCALE: 1"=1 200' PHONE: (239) 594-2021 ma, t.: ENGINEERING DESIGN www.humistonandmoore.com AND PERMITTING JOB:13078 (DATUM: NONE (FIGURE: 1 4 pressure readings. Collecting redundant data is the practice of the National Oceanic and Atmospheric Administration (NOAA), which has installed two tide gages at the NOAA tide station on the Naples Pier. 3. Tide Phase Lag One of the parameters monitored during the tidal study is tidal phase lag. This is the time difference between the high or low tide in the Gulf of Mexico and the corresponding high or low tide in the bay. The magnitude of this phase lag is an important indicator of inlet dynamics, because shoaling in an inlet that obstructs tidal flow will cause the phase lag to increase. Figures 2 and 3 show a comparison of the tidal phase lag at high and low tide at three tide gage locations within the bay system. The figures show a comparison of tidal phase lags for the following; • 1998 Preconstruction Dredging Improvement' • 1999 Post Construction Dredging Improvement' • 03-16-2012 to 04-16-2012 Recent Monitoring Interval2 • 04-18-2012 to 05-24-2012 Recent Monitoring Interval2 • 06-07-2012 to 07-12-2012 Recent Monitoring Interval • 07-18-2012 to 08-31-2012 Recent Monitoring Interval • 09-05-2012 to 10-03-2012 Recent Monitoring Interval • 10-09-2012 to 11-01-2012 Recent Monitoring Interval Notes: 1) For the purpose of evaluating project performance, only the pm and post construction data from the original 1999 dredging are included for comparison to the most recently collected data. All of the tide data collected during the life of this project can be referenced through Clam Pass Restoration and Management Plan Bathymetric Monitoring Reports#1 thru#11. 2) The Registry and South tide gage pressure sensors malfunctioned during the 3- 16-2012 to 4-16-2011 and 4-18-2012 to 5-24-2012 data collection intervals, thus no tide data are available from this tide gage location for this time data collection interval. Although for almost the entire monitoring period since the 1999 dredging, the phase lag has remained below the pre-improvement levels, Figure 2 indicates this has changed during the two most recent monitoring intervals. The low tide phase lag levels had an upward progression, similar to other post dredging monitoring, however, after until the passing of tropical system Isaac at which time the average phase lag times spiked and were at levels that actually exceeded the phase lag prior to the initial dredging improvements in 1999. This spike is mostly likely from the pass having a severe restriction within the channel system. Also unlike what has been seen in previous monitoring, the average phase lag has not corrected itself. This also suggests a more severe shoaling problem that will probably require dredging. The low tide phase lag has exceeded the 1998 pre-dredging conditions and indicates that the filling and draining of the bay occurs at a slower rate than before dredging due to high resistance to flow in the channel due to shoaling. 5 I r" t+' >r O Z N O ci ch r- t N '-I f1 0 O +-' n.` N -r-I I O co ' ,. ® 3 0 t Z N duo rh N (n O fa kb 6 ni I— C1J Z H N �;" ■ N ri ci CO u' c 0 Q. A o O N O N O 0 i a �, J `° il 0) d N I 0) ii rI 0 QO -St M o 0) N CD ri aco ceN N. v O Zi b Sol ZI 8I b pal '11°3 a;ep api;oN 00 N ZI-•I-b of ZI-9I-£pal apoD e;ep api;ON al Ol LO .--I O i II 0 0 0 0 0 0 0 0 M N e-4 p sanoH I I I � t 1 `o z Mme, , s ,. F 0 Z 0 —^I' W Z co t M _ L w O(/) (/) L O it Q a = bb G w Q = J U CU r-i M O to v N 0 .-I tlp C O •--1 Zi-bZ-S of ZT-8i-b aTDapoJ elep ap 10N cc O O o O N ZT-9T-b of ZT-9i-£ alpairoa a;ep api oN a O1 ob o rn rn . N o © ® m a N N d N pOp `� c-1 m0 O 0 O 00 0 a ^ O o O v 0 0 00 O p O O O O +-' +� crl N O N ' N N .� r, sinoH v; °o t0 0 0 rn a, , (o om .-i c» 0 0 ® ® 111 7 Figure 3 It should be noted that the high tide phase lag tends to be a little less sensitive to minor amounts of shoaling in comparison to the low tide phase lag, simply because the flow cross section is larger at high tide, and a restriction evident at low tide may not be evident at high tide. However, the recent data shows a similar increase in the high tide phase lag. While this illustrates the importance of evaluating both the low tide and high tide phase lags, the recent data also reinforces the conclusion that it is quite likely that there is an urgent need for dredging. Figures 4 & 5 show the phase lag annual averages since the last dredging event that took place in 2007. Averaging the individual data sets for each monitoring year reduces the scatter in the data and helps identify trends. Both of these figures show a general trend of increasing phase lag after dredging. This is to be expected as it is understood that sand will accumulate in the system. Since the rate of accumulation is highly dependent on weather events, this is why collecting tide data at frequent intervals, and hydrographic data annually at a minimum, is important. Post storm hydrographic surveys would also provide valuable information if storm characteristics resulted in extensive shoaling, especially shoaling at the interior channel. It is therefore expected that overall phase lag will show a trend of increasing, indicating gradual decrease in the efficiency of flushing. This is what is expected between maintenance dredging events, and by itself is not cause for concern. It is the magnitude and duration of increases in phase lag that are markers that may indicate the need for maintenance dredging. It is important to consider the high tide phase lag and tide range data, as discussed below, along with the hydrographic monitoring to optimize the scheduling of maintenance dredging. 4.Tide Range As with the tide phase lag, the tide range data can be used in the determination of when maintenance dredging may be needed. A decrease in the tide range in the bays is an indication that flow through the inlet is being obstructed by shoaling. The data presented in Figure 6 compares the tide range in Clam Pass to the Gulf of Mexico tide range, and generally show that during the most recent data intervals the tide range appears to be declining since the post 1999 dredging tide range. This is what should be expected because of the ongoing gradual accumulation of material in the flood shoal. The data also suggest that the tidal range data, as discussed above for the phase lag data, can be variable over short data intervals. In general, periods of higher tides, during the spring phase of the tidal cycle, will themselves produce greater bay tide ranges; however, they also result in strong tidal currents which typically scour shoals from the inlet. The system responds to this scour action with longer intermediate increases in the tidal range. This shows, as illustrated in Figure 6, that the 1999 dredging and maintenance enhanced the ability of the inlet to scour sand from the channel in this manner. The data from the North and Upper gages show a decrease in tide range, which may be an indication that more shoaling is occurring in the meandering interior channels that connect those bays to the inlet channel. However, the phase lag data do not consistently show similar effects. Inner and Upper Clam Bays are more remote from the inlet and water must flow through long and narrow meandering channels to reach those water bodies, and consequently they may be more influenced by wind driven currents in comparison to Clam Bay and Outer Clam Bay which are more directly connected to the 8 I i '',.,77r >. i : '': 4 @F' i !4;:::;i:'.'''''''':').fi;::i..'..,‘,,.,'''.' 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Atmospheric conditions could easily cause what might appear to be inconsistencies between phase lag and tide range data, particularly for the bay areas farthest from the inlet. The degree to which shoaling may have occurred in the interior channels affecting Inner and Upper Clam Bays can be verified through bathymetric monitoring. However, previous monitoring has shown the shoaling rates in those interior channels to be low in comparison to the inlet channel, and the inner channels may therefore be surveyed on a less frequent basis to reduce survey costs, since change has already been documented to occur relatively slowly in comparison to the more dynamic areas close to the inlet entrance. The data from the North and Upper gages, give a relatively constant tide range from March to August followed by a decrease in tide range in September and October This is consistent with the phase lag data, which indicates shoaling is occurring. However, the most recent data collection interval, 6-12-12 to 11-01-12, showed a significant decrease in tide range. Again, the degree to which shoaling may have occurred in the interior channels is also verified through bathymetric monitoring at four year intervals. Tide data were not collected in Upper Clam Bay prior to the 1999 dredging, so the change in tide range from the pre-dredging conditions for this area cannot be quantified. If it is determined that flushing of Upper Clam Bay needs further improvement, based on the health of the mangrove community or other environmental data, that could be achieved by straightening selected meandering sections of the interior waterways which connect Clam Bay with Inner Clam Bay and Upper Clam Bay, as discussed further in Section 5 below. Figure 7 is a presentation of the tide range data that averages all the data within each calendar year since the 2007 dredging. This longer term averaging smoothes the data scatter that is evident in Figure 6, and illustrates that the tide ranges in the bays remain significantly above the pre-1999 dredging, and are similar to the post-1999 dredging. This demonstrates that the 1999 restoration and management plan design is still working. However, the 2012 average values for the tide ranges in the bays are skewed to a higher value due to the fact that 75% of the data was collected prior to the storm events this past summer which have reduced the tidal flow in and out of the inlet. 5. Conclusions and Recommendations The most recent tidal data indicate tidal flushing of Clam Bay is actually not as good as it was prior to the initial dredging in 1999. Figure 8 shows a comparison between recently measured low tide phase lag to the low tide phase lag preceding the 2002 and 2007 dredging events. This shows that the low tide phase lag exceeded what it was prior to the 2002 maintenance dredging at all stations. Overall, this indicates that the system is not flushing as well as it was prior to each of the two previous maintenance dredging events, indicating that maintenance dredging may be necessary to maintain efficient flushing. However, it is always recommended that the hydrographic survey data be evaluated as part of the process to determine when to schedule maintenance dredging.This data can also be used to estimate the quantities of material that need to be dredged from each station along the channel. From an inlet flushing standpoint, inlet closure has not been a concern since the 1999 dredging. However, due to significant storm events in the last several months, flow 12 4• r w ?, " a 000Z ll1Nn on 4 L a ab 4 11 t93aAVi n "9V1It]1 a F_f O z cc w CU c o ��m v v ov o0 CO° v cc ,_ v v Lv a to v >o 2 . > N� v O 0 0 a • N a 00 0 N Ol 0 - N 0w0 C } Z Ol -1 L,, LJ in aL p W W W Z a Q F-1-Ln 0 w�Q 2' )S Q cr ..,,„.....-„:„.„,,,..4,„,------,. 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Sand from the maintenance dredging has in the past been used to re-nourish the beach at Clam Pass County Park to the south, as well as the Pelican Bay beach to the north, and beach conditions as well as bathymetric data have been considered in scheduling the two previous maintenance dredging projects. However, the most recent tide data indicate that dredging is probably needed to maintain the inlet regardless of the sand needs for beach renourishment. The tidal studies should therefore be continued as an integral part of the annual monitoring because they provide an excellent indication of when shoaling of the inlet and other channels has occurred to the extent that tidal circulation in the bay system has been adversely affected. Inconsistencies in tidal data have previously been treated as random scatter in the data when there is no coincident bathymetric data available to quantify short term changes in channel shoaling patterns because this scatter has for the most part been relatively small in comparison to the overall ranges in the various tidal criteria. However, the scatter makes it difficult to identify small changes that would occur in response to the gradual shoaling in the inlet and the interior channels. Additionally, over the fourteen years of monitoring since 1998, tide gage failures have occasionally left gaps in the data which preclude making comparisons between other gages and different periods of time. It has therefore been recommended that the tidal data collection program be expanded to include redundant data collection with duplicate gages at each tide station to reduce potential for gaps in the data resulting from gage malfunction. The additional gages also provide a means to verify data accuracy, in the event of bio-fouling of gage sensors, which has at times been a problem in the past. Although limited dredging in portions of the existing meandering channels between the four bays appears to have contributed to improving the flushing of Inner and Upper Clam Bay, tidal exchange remains relatively low at the north end of the system. If biological studies or water quality monitoring indicate further enhancement to flushing of the remote northern portion of the bay system is necessary, that may be accomplished by increasing the tidal prism through selectively improving sections of the meandering interior channels which connect the bays. This approach would necessitate removing small areas of existing mangroves. This would mean either deepening or straightening selected sections of channel, or a combination of the two. Although this might be perceived as a negative impact to the mangrove community in the immediate vicinity of the dredge cuts, this alternative could include restoration of mangroves within bypassed channel meanders. However, other implications of this action should be considered as well. Leaving the bypassed meanders as parallel channels would aid flushing; it may result in a beneficial increase in diversity of habitat as a branching channel system would leave sections of quieter deep water channel in addition to the higher flow velocity achieved in a shorter main channel. It would result in a net increase in total length of mangrove fringed channel shoreline. These considerations should be evaluated in objectively determining if this alternative would provide a net environmental benefit to the broader goal of managing the ecology of the bay system. 6. Channel Entrance Width. There has been much discussion about the optimum width of the entrance channel cut across the beach. It should be understood that there is a maximum width that can be supported by the tidal flow of the bay system. That tidal flow is 15 determined by the size of the bay. The size of the bay is in fact much larger at high tide than it is at low tide. This, and other variables such as the diurnal and semidiurnal tidal periods of the lunar cycle, and exactly where along the channel the equilibrium section occurs (in fact it moves), make determination of a precise width easier said than done. The success of previous dredging without impact to adjacent shorelines, as well as the apparent equilibrium cross section from previous monitoring between dredging events, are the best way to evaluate an appropriate width of cut. It should also be understood that cutting the entrance slightly larger than the equilibrium width is better than cutting it too small. If the cut is too small, tidal currents will scour it to a larger section, and some of that sand that is scoured from the entrance will be carried into the inner shoals on flood tide, hastening the need for the next dredging event. It is probably appropriate to continue dredging the cut to the same width that has been dredged in the past, as long as monitoring shows it does not impact adjacent beaches. Dredging the cut too wide will result in slow tidal currents because they are limited by the size of the bay. Slow tidal currents promote shoaling, and the shoaling will occur by the trapping of sand from the beach, potentially causing beach erosion. Slower tidal currents can also result in collapse of the ebb shoal onshore creating more restriction to flow, yet also potentially increasing sand supply to adjacent beaches. 7. Recommendations for Ongoing Monitoring. The dredging plan for Clam Pass was designed to improve flushing while minimizing the impact dredging might have on adjacent beaches. Dredging impacts to adjacent beaches typically occur at inlets with navigation maintenance dredging projects that interrupt natural littoral bypass of the inlet by cutting a navigation channel across the ebb shoal. Dredging of the ebb shoal at Clam Pass has always been minimized for this reason. Any proposed increase in the scope of dredging at Clam Pass should include a comprehensive monitoring plan to continue to evaluate effects on adjacent beaches. Tidal monitoring should continue as it has been demonstrated to provide an excellent indicator as to when tidal circulation is affected by inlet shoaling, and when maintenance dredging should be considered to maintain flushing of the Clam Bay system. The tidal data should continue to be used in conjunction with the bathymetric data in evaluating the need for dredging. Lastly, as discussed herein, the tide data shows how the dynamic system adjusts to varying weather and tide conditions. It is not recommended that a specific threshold value for the tidal data or cross sectional area be chosen to trigger dredging as a comprehensive evaluation of both data should be considered in making that determination. 8. References 1.) Humiston and Moore Engineers, Clam Pass Restoration and Management Plan Bathymetric Monitoring Reports 1 through 10, 2000—2009. 2.) Pelican Bay Services Division,Tide Data, 1998—2012. 3.) Florida Department of Environmental Protection Joint Coastal Permit No. 0128463- 001-JC. 4.) NOAA Station 8725110—Naples Pier-Naples, FL, Tide Gage Data, 1998—2012. 16 1 . , , . . N N N N N N N N N N N N N N N N N NJ NJ N NJ 0 I--. 1-. I--• I--• F• F• F. F. 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N N N -z -z •2 .z � -z -z •z •2 •z -2 - U 0 0 0 ,. 0 (D 0 Cl) 7 O. 7 CO O co a December 10,2012 Clam Bay Subcommittee of the Pelican Bay Services Division Board 4.FDEP Data for copper levels in Clam Bay Page 1 of 1 Original Message From: Tim Hall [mailto:Tim @turrell-associates.com] Sent:Thursday, December 06,2012 11:39 AM To: ResnickLisa Subject: RE: STORET/Clam Bay WBID According to the DEP folks,The official change date would be the same as the IWR and WIBD runs which in this case would be 09/30/2011. All past data collection associated with collection points within the WIBD should now be associated with the new boundary. Regards, Tim Hall Turrell, Hall &Associates, Inc. Marine&Environmental Consulting 3584 Exchange Ave. Naples, FL. 34104-3732 Phone: (239)643-0166 Fax: (239)643-6632 Web: www.turrell-associates.com Original Message From: Tim Hall [mailto:Tima,turrell-associates.com] Sent: Thursday,December 06,2012 10:51 AM To: ResnickLisa Subject: RE: STORET/Clam Bay WBID Hey Lisa, We confirmed that Clam Bay was separated from Moorings Bay and given its own WBID number in 2011.. All data from that point is under that ID number. What I have not been able to confirm yet is if all data collected prior to the separation date is being split into the appropriate WBIDs. Regards, Tim Hall Turrell,Hall &Associates, Inc. Marine& Environmental Consulting 3584 Exchange Ave. Naples, FL. 34104-3732 Phone: (239)643-0166 Fax: (239)643-6632 Web: www.turrell-associates.com THE INFORMATION CONTAINED IN THIS TRANSMISSION IS INTENDED ONLY FOR THE USE OF THE INDIVIDUAL OR ENTITY TO WHICH IT IS ADDRESSED AND MAY CONTAIN INFORMATION THAT IS PRIVILEGED,CONFIDENTIAL,WORK PRODUCT AND'OR EXEMPT FROM DISCLOSURE UNDER APPLICABLE LAW. IF THE READER OF THIS MESSAGE IS NOT THE INTENDED RECIPIENT(OR THE EMPLOYEE OR AGENT RESPONSIBLE FOR DELIVERING IT TO THE INTENDED RECIPIENT),YOU ARE HEREBY NOTIFIED THAT ANY DISSEMINATION,DISTRIBUTION OR COPYING OF THIS COMMUNICATION IS PROHIBITED. IF YOU HAVE RECEIVED THIS COMMUNICATION IN ERROR,PLEASE NOTIFY US BY TELEPHONING US(COLLECT)AND RETURN THE ORIGINAL MESSAGE TO US AT THE ADDRESS ABOVE AT OUR EXPENSE. ORDINANCE NO.2013 - AN ORDINANCE OF THE BOARD OF COUNTY COMMISSIONERS OF COLLIER COUNTY, FLORIDA, AMENDING ORDINANCE NO. 2002-27, AS AMENDED, WHICH CREATED THE PELICAN BAY MUNICIPAL SERVICE TAXING AND BENEFIT UNIT, BY AMENDING SECTION FOUR, PURPOSE; POWERS; SECTION SEVEN, CREATION OF THE PELICAN BAY MUNICIPAL SERVICE TAXING AND BENEFIT UNIT ADVISORY COMMITTEE KNOWN AS THE PELICAN BAY SERVICES DIVISION BOARD; SECTION EIGHT, COMPOSITION, NOMINATION AND APPOINTMENT; AND SECTION ELEVEN, OFFICERS; QUORUM; RULES OF PROCEDURE; PROVIDING FOR CONFLICT AND SEVERABILITY; PROVIDING FOR INCLUSION IN THE CODE OF LAWS AND ORDINANCES; AND PROVIDING FOR AN EFFECTIVE DATE. WHEREAS, on May 28, 2002, the Board of County Commissioners (Board), adopted Ordinance No. 2002-27, which superseded, repealed, and consolidated prior ordinances relating to the Pelican Bay Municipal Service Taxing and Benefit Unit("Unit"); and WHEREAS, the Board subsequently amended Ordinance No. 2002-27 by adopting Ordinance No. 2006-05 and Ordinance No. 2009-05; and WHEREAS, the Board desires to further amend Ordinance No. 2002-27, as amended, in order to clarify that the Unit will be solely responsible for advising the County on dredging and maintaining Clam Pass for the purpose of enhancing the health of the affected mangrove forest and will manage such activities for the County; to add a non-voting member recommended by the Pelican Bay Foundation; and to create a system of rotating officers for the Unit. NOW, THEREFORE, BE IT ORDAINED BY THE BOARD OF COUNTY COMMISSIONERS OF COLLIER COUNTY, FLORIDA,that: SECTION ONE: AMENDMENT TO SECTION FOUR OF ORDINANCE NO. 2002-27, AS AMENDED. Section Four is hereby amended as follows: SECTION FOUR: Purpose; powers. The Unit is formed for the purpose of providing street lighting, water management, ambient noise management, extraordinary law enforcement service and beautification, including but not limited to beautification of recreation facilities, sidewalk, street and median areas, identification markers, the maintenance of conservation or preserve areas including the restoration of the mangrove forest preserve and to finance the landscaping beautification of only Words Underlined are added;Words Struck-Through are deleted. Page 1 of 4 that portion of U.S. 41 from Pine Ridge Road to Vanderbilt Beach Road in the above-described taxing and benefit unit and to that end shall possess all the powers to do all things reasonably necessary to provide such services. The Unit will be solely responsible for advising the County on dredging and maintaining Clam Pass for the purpose of enhancing the health of the affected mangrove forest, and will manage such activities for the County. SECTION TWO: AMENDMENT TO SECTION SEVEN OF ORDINANCE NO. 2002-27,AS AMENDED. Section Seven is hereby amended as follows: SECTION SEVEN: Creation of the Pelican Bay Municipal Service Taxing and Benefit Unit Advisory Committee Known as the Pelican Bay Services Division Board. Concurrent with the passage of the Ordinance, an 11 member advisory committee to be known as the Pelican Bay Services Division Board (PBSD Board) is hereby created. Those individuals who are members of the PBSD Board pursuant to Collier County Ordinance No. 90- 111, as amended, as of the moment prior to the effective date of this Ordinance, shall continue on as members of the PBSD Board until March 31st of the year in which their term would have expired as set forth in the prior ordinances, and shall continue to hold over and serve in that capacity until their position is filled as provided for in this Ordinance. In addition, there shall be 1 non-voting member nominated by the Pelican Bay Foundation in the manner set forth below. This non-voting member shall not be subject to the voting requirements set forth below. SECTION THREE: AMENDMENT TO SECTION EIGHT OF ORDINANCE NO. 2002-27,AS AMENDED. Section Eight is hereby amended as follows: SECTION EIGHT: Composition, nomination and appointment. A) The PBSD Board shall be representative of the residential, business and commercial interests and landowners in Pelican Bay. To that end, nine of the PBSD Board members shall be representative of the residential interests within the Unit and two of the PBSD Board members shall be representative of the commercial and business interests within the Unit. The non-voting member shall be recommended for appointment by the Pelican Bay Foundation. The non-voting member should be an individual who is not related to and who is independent of the other Board members and County employees, with no apparent conflict of interest or appearance of impropriety. Members of the PBSD Board shall be appointed by and serve at the pleasure of the Board of County Commissioners pursuant to the procedure outlined herein. The nine (9) PBSD Board members representative of the residential interests within the Unit, and the non-voting member recommended for appointment by the Pelican Bay Foundation, shall be residents of and qualified Words Underlined are added;Words Struck Through are deleted. Page 2 of 4 • electors within the Unit. The two PBSD Board members representative of the commercial/business/other interests shall be residents of and qualified electors in Collier County. ********** SECTION FOUR: AMENDMENT TO SECTION ELEVEN OF ORDINANCE NO. 2002-27,AS AMENDED. Section Eleven is hereby amended as follows: SECTION ELEVEN: Officers; quorum; rules of procedure. A) At its earliest opportunity, the membership of the PBSD Board shall elect a chairman and vice chairs from among the members. Officers' terms shall be for one year, with no eligibility for re-election. Officer's terms are to be on a rotating basis, with no member allowed a second term for the same office unless all members have previously served in that position. This provision shall be retroactive for one year prior to the adoption of this ordinance, and shall apply to all current officers and members. ********** SECTION FIVE: CONFLICT AND SEVERABILITY. In the event this Ordinance conflicts with any other ordinance of Collier County or other applicable law, the more restrictive shall apply. If any phrase or portion of the Ordinance is held invalid or unconstitutional by any court of competent jurisdiction, such portion shall be deemed a separate, distinct and independent provision and such holding shall not affect the validity of the remaining portion. SECTION SIX: INCLUSION IN THE CODE OF LAWS AND ORDINANCES. The provisions of this Ordinance shall become and be made a part of the Code of Laws and Ordinances of Collier County, Florida. The sections of the Ordinances may be renumbered or relettered to accomplish such, and the word "ordinance" may be changed to "section," "article," or any other appropriate word. SECTION SEVEN: EFFECTIVE DATE. This Ordinance shall be effective upon filing with the Department of State. Words Underlined are added;Words Struck Through are deleted. Page 3 of 4 PASSED AND DULY ADOPTED by a vote of a majority plus one of the Board of County Commissioners of Collier County, Florida,this day of , 2013. ATTEST: BOARD OF COUNTY COMMISSIONERS DWIGHT E. BROCK, CLERK COLLIER COUNTY, FLORIDA By: By: , Deputy Clerk , CHAIRMAN Approved as to form and legal sufficiency: Jeffrey A. Klatzkow County Attorney Words Underlined are added;Words Struck Through are deleted. Page 4 of 4 Original Message From: lustigl @embargmail.com [mailto:lustigl @embargmail.com] Sent: Monday, December 10, 2012 11:36 AM To: naplessusan @comcast.net; Cravens, Tom Cc: Resnick Lisa(PBSD) Subject: Today's Clam Bay meeting Susan and Torn, I am eagering looking forward to your meeting today. I notice Tim Hall's report on Clam Bay estuary system. Assuming that he will be present today, I'd like to hear his opinion on what impact the "choked"Pass is having on the health of the fish population in the bays/estuary. Could you ask him to speak to that topic once he has finished his presentation on the report?My husband, like so many other Pelican Bay and Seagate residents, is an avid fisherman. The fishermen have already noted a tremendous difference in the types and numbers of fish right off shore by the pass, probably due to the significantly lowered water movement currents. Can Tim address the impact within the Bays, even if just a well- informed "speculation?" Until the choking of the pass,there was some superb fishing within the estuary. (Sh-h-h. Fishermen don't freely share the locations of their favorite fishing holes.) We've "heard"that the water is stinking, and there are no fish, which means the bird population has drastically dropped off in the far back reaches of the estuary. Sincerely, Diane Lustig - Marshall, Lisa (Bill Nelson) Subject: FW: Marcia Cravens (UNCLASSIFIED) Attachments: Cravens, Marica.pdf; FACT SHEET SAJ 1996-2789-Clam-Pass-Oct-13-2011.doc Original Message From: acoe Sent: Thursday, October 13, 2011 11:30 AM To: Marshall, Lisa (Bill Nelson) Cc: Sanchez, David (Bill Nelson) Subject: FW: Marcia Cravens(UNCLASSIFIED) Classification: UNCLASSIFIED Caveats: NONE Lisa, The referenced project is for a maintenance dredging application for Clam Pass/Ciarrr Bay. Besides possible perceived impacts to mangroves in Clam Bay,the residents of Pelican Bay claim to own the bottom of the bay and would like to restrict motorized boat access to Clam Bay. The County is at least partially interested in dredging to improve boat access to a community to the south known as Sea Gate. The original Corps permit was issued for dredging to improve the flushing in Clam Bay and improve the health of the mangroves in the bay. The proposed dredging is the same footprint. We see no impacts to seagrasses or other aquatic resources. Project changes to a slightly revised disposal area required the Corps to issue two public notices for this project. We are aware of the concerns raised by Ms. Cravens and others and the file reflects their comments. Our process is initially to address the concerns via phone call and then address them in writing in our decision document when a permit is issued or denied. The Corps Project Manager, Linda Elligot, has spent numerous hours on the phone with Ms. Cravens explaining the project. The current status is that the project has been withdrawn at the request of the applicant, Collier County. Citizens requesting a public hearing will be notified in writing on our decision to hold or not hold a public hearing. At this point, the Corps doesn't see a need to hold a public hearing. The attached Fact Sheet contains more detailed information on the project. Thanks. Jacksonville District U.S. Army Corps of Engineers Office: (904) 232-2243 CESAJ-RD 13 October 2011 FL - 14 FACT SHEET Clam Pass Maintenance Dredging (SAJ-1996-02789) Regulatory Basic Project Purpose : Ecological restoration. Overall Project Purpose : To conduct periodic maintenance dredging (10-year permit) and concurrent beach renourishment activities within Clam Pass/Clam Bay estuary near Naples, Florida to aid with tidal flushing/water quality and to restore/enhance/maintain estuarine/aquatic resources . Applicant : Collier County - Coastal Zone Management W. Harmon Turner Bldg, Suite 103 3301 East Tamiami Trail Naples, FL 34112 Authority: Pursuant to Section 10 of the Rivers and Harbors Act of 1899 and Section 404 of the Clean Water Act . Waterway Location/Dredge Materials Disposal Plan: Project is located along 1, 800 linear feet of Clam Bay/Clam Pass and the coastal shoreline (between Florida Range Monuments R-42+180 and R-44+100) near southern project limit at Clam Pass County Park and (between Florida Range Monuments R-39+733 and R-41+00) near northern project limit near the Pelican Bay residential development, near Seagate Drive and Crayton Road, in Sections 8/9, Township 49S, Range 25E, Naples, Collier County, Florida. Site Coordinates (NAD83) (Clam Pass) : Latitude 26 . 219912 Longitude -81 . 817980 PROPOSED WORK: The applicant has proposed maintenance dredging along 1, 800 linear feet (within 2 . 83 acres) of Clam Pass in concert with an historic (2007) dredge template using hydraulic and mechanical dredging techniques to achieve a previously- permitted target dredge depth of -5 . 6' to -7 . 1' NAVD88 (-4 . 0' to -5 . 5' NGVD29) . There are no proposed impacts to mangroves, wetlands or submerged aquatic vegetation. The work involves removal of 22 , 000 cubic yards of beach-compatible sand from Clam Pass between stations 0+00 to 18+00 to aid with tidal flushing/water quality and to restore/enhance/maintain estuarine/aquatic resources . The work also involves discharge of 6, 200 cubic yards of clean fill (dredged beach-compatible w materials) to 16, 291 square-feet/0 . 37 acre of open water channel for shoreline stabilization on the north side of Clam Pass; additional re-deployment via trucking of beach-compatible sand is proposed at 2 areas : a) volume-as-needed along 1, 928 linear feet of shoreline at the Clam Pass County Park (as initially proposed) ; b) volume-as-needed along 1, 291 linear feet of shoreline near the Pelican Bay residential development (this added discharge element was proposed after the initial Public Notice was issued) . Duration of construction/event : 90 days . Past Actions : Initial application date : 12 June 2009 . Initial Public Notice: 23 April 2010 . Subsequently, multiple Requests for Additional Information (RAIs) and the file was withdrawn/re- activated. Complete : 12 May 2011 (with project revisions) . Public Notice re-issued: 13 May 2011 . Endangered Species Act (ESA) coordination history: consultation initially requested for nesting sea turtles on 1 June 2010 ; re-coordinated with U. S . Fish and Wildlife Service (USFWS) due to project revisions on 16 May 2011 . The Corps requested use of State Programmatic Biological Opinion (SPBO) for sand placement activities on 5 August 2011; to support use of the SPBO, Corps requested informal consultation for piping plover on 12 September 2011 . On 22 September 2011, agent requested that the project be withdrawn since they cannot proceed until a pending additional work order/ budget authorization by the applicant is approved. Next Actions : Reactivate file when complete RAI response is provided; continue ESA consultations (USFWS) ; process request (s) for public hearing (note : a public hearing would not likely result in provision of additional information relevant to rendering a permit decision; denial of request (s) for public hearing is pending) . Issues : Corps : Listed species concerns (nesting sea turtles : Green sea turtle; Loggerhead sea turtle; Piping plover) ; USFWS formal/ informal ESA consults are in process ; State permit is pending. Public : Numerous adverse comments were filed by NGOs (Sierra Club, Mangrove Action Group and residents of the Pelican Bay residential community) to express opposition to the dredging aspects of this project; no opposition to the sand placement activities component have been filed. Note : complex political history exists among the residential communities in this area. Final action: Pending.