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Item H06H.6 t, BOARD OF COUNTY COMMISSIONERS County of Monroe Mayor David Rice, District 4 IleOI1da Keys l'U� Mayor Pro Tem Sylvia J. Murphy, District 5 �pw° Danny L. Kolhage, District I George Neugent, District 2 Heather Carruthers, District 3 County Commission Meeting November 20, 2018 Agenda Item Number: H.6 Agenda Item Summary #4905 BULK ITEM: No DEPARTMENT: Sustainability TIME APPROXIMATE: STAFF CONTACT: Rhonda Haag (305) 453-8774 11:30 A.M. AGENDA ITEM WORDING: Discussion and direction on the County's three air curtains installed on Big Pine Key as part of the County's demonstration projects that were destroyed by Hurricane Irma. ITEM BACKGROUND: As part of the County's canal restoration demonstration program, three air curtains were installed on Big Pine Key in canals 266, 287 and 290. Canal 266 (Dr's Arm subdivision) and 290 (Avenue J) first received an organic sediment removal before installation of the air curtain, and canal 287 (Atlantis Estates subdivision) received only an air curtain. The projects were in various stages of post -construction effectiveness monitoring by FIU when Irma struck in September 2017 and destroyed all 3 air curtains. FIU completed their monitoring of the demonstration projects and presented the results at the August 15, 2018 commission meeting, where it was reported that the results of the air curtain installed on canal 287 was of little effect and the results of the combination backfilling/air curtain restorations on canals 266 and 290 were less effective than other restoration types such as culverts and backfilling. (Report attached in the backup.) Residents are asking of the County's plans for the destroyed air curtains. Some have indicated a preference for the air curtains to be replaced while others requested the original resident -owned weed -gate type of systems be reinstalled. The residents of canal 266 have stated they have signed letters from a majority of the property owners stating they want the County to reinstall the air curtain and are willing to pay for the operations and maintenance (if the County meets the conditions outlined in their letter, which the County cannot agree to in its entirety), sample letter attached in the backup). Few residents on other canals have offered to pay the O&M costs. Potential reimbursement of the replacement cost from FEMA is possible. The estimated cost to replace the 3 air curtains is $300,000 - $400,000, and if undertaken, the County would be eligible for 75% reimbursement. The funds could possibly also be applied to alternate weed control methods, such as canal skimming, which involves no operations and maintenance costs. Packet Pg. 1150 H.6 Also, canal 83 in Key Largo received a restoration in 2017 which was completed just prior to Irma. An air curtain was not installed, and numerous residents have since stated they do not wish to pay the long term operations and maintenance costs for one. Floating seaweed has filled the canal numerous times this summer and the canal was cleared several times by the County's skimming program. A discussion as to how to move forward on this canal will be included in the discussion. Potential replacement of the air curtains could not take place until the marine dredging from Irma was completed in those canals. Now that the clearing is nearing completion for these canals, a decision is needed about the path forward so that a formal application to FEMA can be made. For all options there are no identified budgeted funds to fund the upfront costs and reimbursement is limited to 75% from FEMA. Options include the following: 1. Do nothing and expend no County funds at this time. 2. Replace the residents' original weed gate systems in one or more of the canals. Coordinate with the permit agencies on revising the current permits and transferring the permits back to the homeowners to replace the resident's original PVC arm type of weed gate systems which existed on canals 287 and 290 and the ice eater pumps with floating docks which existed on canal 266. The maintenance and operation for the weed gate systems would then be turned back to the residents. 3. Replace the County's air curtains in one or more canals. Residents on canal 266 have requested replacement. Decisions must be made as to who will pay the long term O&M costs (residents or County) and if the County will pay for a year or more of the O&M costs until a potential MSBU is put in place. 4. Set up a Canal Skimming program on Big Pine Key in lieu of replacing the County's air curtains. 5. Options for Canal 83 only in Key Largo that never received an air curtain after their restoration include: • install an air curtain, funds will need to be identified and an MSBU assessment set up • don't install an air curtain but fund a canal skimming program instead • do nothing and advise the residents to either install their own air curtain or restore the jetty outside of the canal that was damaged by Irma, as that jetty would keep out most of the floating seaweed. PREVIOUS RELEVANT BOCC ACTION: Not applicable CONTRACT/AGREEMENT CHANGES: N/A STAFF RECOMMENDATION: Not applicable - seeking guidance and direction DOCUMENTATION: Packet Pg. 1151 H.6 Sample letter from canal 266 residents DRAFT FINAL REPORT DEMONSTRATION OF CANAL REMEDIATION METHODS 41 Air Curtains Narrative to FEMA 04.02.18 FINANCIAL IMPACT: Effective Date: N/A Expiration Date: N/A Total Dollar Value of Contract: N/A Total Cost to County: TBD Current Year Portion: N/A Budgeted: No Source of Funds: TBD CPI: N/A Indirect Costs: N/A Estimated Ongoing Costs Not Included in above dollar amounts: Potential O&M Costs Revenue Producing: No If yes, amount: Grant: N/A County Match: N/A Insurance Required: N/A Additional Details: The fiscal impact is dependent on the direction provided. If the decision is made to replace the air curtains for the estimated cost of $300,000, the County would front the costs and would potentially be reimbursed 75% by FEMA. The County could also be funding the operations and maintenance costs for a period of time until and unless the County implements an assessment program for the residents to fund the O&M costs. REVIEWED BY: Rhonda Haag Completed 11/05/2018 10:45 AM Pedro Mercado Completed 11/05/2018 10:55 AM Budget and Finance Completed 11/05/2018 2:38 PM Maria Slavik Completed 11/05/2018 2:39 PM Kathy Peters Completed 11/05/2018 3:48 PM Board of County Commissioners Pending 11/20/2018 9:00 AM Packet Pg. 1152 To� Rhonda Haag Director of Sustanabifty and Projects Monroe Comfy Subjem Cana 6 Air Curtain Operaflon & Mar ntena rice Assessment Per the rare gdnal agreement wfth Morime County, I support a property assesmnent for the O&M uf the alr curtain on carW #266 based on the Wlowdng understanding!, There wrlf be one assessr'nent per property owner, The Cbunty widl retairs ownersNp of the ad�'Wrtaln and wOl be responsiWe for aU costs associated withi 12 operation, maintenance and replacement of parts 0 RA Prior to establW'Ong an assessment arnOUnt, Lhe Ccwnty will provide as compdete cost basds of the asseArnenl tothe canal property owners U) The assessment fund wj0l operate wIth complete financW transparency and wfll be avaflaik for review at any fin'ie by the car'W property owners The canal owners wiH be grartee operahonad controof the air curtain The assessment w0l iae revmewed and adjkust'ed on a yearfy basi�s to reflect operafion costs, ard maintenance/rep�acerrwnt ac(;timWated funding levells I Packet Pg. 1153 1 MONROE COUNTY - FLORIDA DR - 4337 - FL NARRATIVE In 2014 Monroe County embarked on a canal restoration program after a study showed that 311 of the 502 canals throughout the island chain did not meet the State's minimum water quality criteria — and are a source of nutrients and other contaminants to near shore waters. The County funded $7 million for 8 demonstration projects that used different methods for canal restoration including organic muck removal, backfilling, air curtains, and culverts. The purpose was to verify the applicability, feasibility, effectiveness and costs of the different methods. In September 2017, Hurricane Irma dealt the Canal Restoration Program a major blow, with its high winds and storm surge filling many of the Keys' canals with debris and damaged boats. During the incident beginning September 10th, 2017, hurricane wind force combined with wind driven rain and flood surge due to Hurricane Irma caused severe damages to Monroe County, Florida generating various types of marine debris including but not limited to Vegetative: fallen trees/plants/sea weed; Construction: Mobile homes / boat lifts/ roofs; and Sediments: Organic muck / sand / rocks. Monroe County is in southern Florida and encompasses the Florida Keys and portions of the Everglades National Park and the Big Cypress National Preserve and is approximately 983 Sq. Mile of land area, comprises of many islands over 112 miles in length that extend from the southeastern tip of the Florida peninsula to Key West. The County operates and maintains all beaches, waterways, and approximately 502 canals (or 170 miles of canals) and is responsible for hurricane debris collection in the nearshore waters and canals surrounding the County. This category D project documents the restoration needed to repair the aforementioned demonstration projects including the air curtain systems, removal of organic material , backfill operations and culvert maintenance in Big Pine Key, Key Largo, and Geiger Key canals # 266, #277, #287, #290, #29, #83, and #472, respectively, that were damaged by the storm to pre -disaster condition. The air curtains are designed to prevent floating, wind -driven seaweed from entering man-made canals, the organic muck was implemented to remove the oxygen depleting material from the canal bottoms, the backfill was implemented to eliminate the deep anoxic zones within the canal systems and the culverts were installed to increase flushing within the dead end canal systems. III II IIlfl "IIII' II jR""",RIII' IIIRIII AIR CURTAINS SYSTEM 1. Canal # 266 between Witters and Baileys lanes, Big Pine Key. Installed new air curtain with 20 diffusers placed on 10 weighted plastic bases placed on the canal bottom across the 40-foot-wide mouth of the canal. Each of the 10 weighted plastic bases contained 2 diffusers that connected to a manifold via 0.5-inch bottom line self -weighted tubing. The manifold contained 10 needle valves to allow for air flow adjustment. From the manifold, two 1.25-inch PVC lines connected to two equipment cabinets, each of which contained 5 compressors. 1 H.6.c PW REF R Packet Pg. 1154 MONROE COUNTY - FLORIDA DR - 4337 - FL 2. Canal # 287 between Hollerich and Atlantis Drives, Big Pine Key. Installed air curtain with 22 diffusers placed on 11 weighted plastic bases placed on the canal bottom across the 45-foot-wide mouth of the canal. Each of the 11 weighted plastic bases contained 2 diffusers that connected to a manifold via 0.5-inch bottom line self - weighted tubing. The manifold contained 11 needle valves to allow for air flow adjustment. From the manifold, two 1.25-inch PVC lines connected to two equipment cabinets, each of which contained 7 compressors. 2 H.6.c PW REF R Packet Pg. 1155 MONROE COUNTY - FLORIDA DR - 4337 - FL 3. Canal # 290 between Avenue I & Avenue J, Big Pine Key Installed air curtain with 20 diffusers placed on 10 weighted plastic bases placed on the canal bottom across the 40-foot-wide mouth of the canal. Each of the 10 weighted plastic bases contained 2 diffusers that connected to a manifold via 0.5-inch bottom line self -weighted tubing. The manifold contained 10 needle valves to allow for air flow adjustment. From the manifold, two 1.25-inch PVC lines connected to two equipment cabinets placed on a wooden platform to minimize flooding risks, each of which contained 5 compressors. Construction including O&M Cost: $340,164 A&E including CEI Cost: $100,000 ORGANIC MATTER REMOVAL / BACKFILLING 1. CANAL # 266 between Witters and Baileys lanes, Big Pine Key. Due to buildup of decomposing seaweed on canal bottom depleting the dissolved oxygen and adding nutrients, restoration consisted of removal of an average 5 feet of decayed seaweed and muck from the canal bottom (from surveyed points 3 feet Mean Low Water (MLW) to 8 feet MLW). Material was excavated using a hydraulic vacuum dredge. The vessel -based vacuum dredge pumped the material through a temporary transmission line to a land side staging area for dewatering. This dewatering system included shakers to screen out larger materials, polymer injection to assist in settling out solids, and a belt press that dewatered the dredge material to approximately 30 percent solids. The separated water (filtrate) was discharged back into the canal, with testing of the filtrate being routinely performed pursuant to permitting requirements. The dewatered dredge material was collected in roll -off bins and transported under manifest 3 H.6.c PW REF R Packet Pg. 1156 MONROE COUNTY - FLORIDA DR - 4337 - FL to the Waste Management Landfill in Medley, Florida for proper disposal. The project consisted of removing 8,300 cubic yards of organic muck within 47,916 square foot area. 2. CANAL # 290 between Avenue I & Avenue J, Big Pine Key Removal of an average 5 feet of decayed seaweed and muck from the canal bottom (survey points: 3 feet MLW to 8 feet MLW (estimated muck volume 4,300 cy). Material was excavated using a hydraulic vacuum dredge. The vessel -based vacuum dredge pumped the material through a temporary transmission line to a land side staging area for dewatering. This dewatering system included shakers to screen out larger materials, polymer injection to assist in settling out solids, and a belt press that dewatered the dredge material to approximately 30 percent solids. The separated water (filtrate) was discharged back into the canal, with testing of the filtrate being routinely performed pursuant to permitting requirements. The dewatered dredge material was collected in roll -off bins and transported under manifest to the Waste Management Landfill in Medley, Florida for proper disposal. The project consisted of removing 4,300 cubic yards of organic muck within 25,700 square foot area. 4 H.6.c PW REF R Packet Pg. 1157 MONROE COUNTY - FLORIDA DR - 4337 - FL 3. CANAL # 83 between Grouper and Bonita lanes, Key Largo. Removal of an average of 2 feet of decayed seaweed and muck from the canal bottom (survey points range from: 7 feet MLW to 9 feet MLW and 15 feet MLW to 20 feet MLW (estimated muck volume 3,500 cy). Material was excavated using a hydraulic vacuum dredge. The vessel -based vacuum dredge pumped the material through a temporary transmission line to a land side staging area for dewatering. The dewatering system included a series of roll off containers to with weirs to allow the material to settle and the dewatered the dredge material to approximately 30 percent solids. The separated water (filtrate) was discharged back into the canal, with testing of the filtrate being routinely performed pursuant to permitting requirements. The dewatered dredge material was collected in roll -off bins and transported under manifest to the Waste Management Landfill in Medley, Florida for proper disposal. The project consisted of removing 3,500 cubic yards of organic muck within 55,321 square foot area. Upon removal of the muck, the canal was backfilled with clean fill material to 8 feet MLW (estimated backfill material 5,700 cy). 5 H.6.c PW REF P Packet Pg. 1158 MONROE COUNTY - FLORIDA DR - 4337 - FL 4. CANAL # 29 between Pigeon and Bunting Drives, Key Largo. • The placement of 22 feet of clean backfill material along the canal bottom (survey points range from: 30 feet MLW to 8 feet MLW (estimated backfill volume 25,000 cy). The clean fill material was delivered via trucks from Quarry located in Miami to the project staging area. The material consisted of base fill soils with no more than 4% by weight organics and no more than 10% by weight passing through a number 200 sieve; top fill soils were Clean Calcium Carbonate Sand containing less than 5% of fines passing through a number 200 sieve. The average number of truckloads of fill delivered to the site per day was 17 trucks. One or two days of delivery of fill was stockpiled at the staging area. A front end loader was utilized to place the fill material on a conveyor belt to transport the fill over the mangrove fringe that prevented direct access to the canal. The conveyor belt allowed the fill be placed on a barge located in the canal. The barge transported the fill up and down the canal to uniformly place the material on the canal bottom. The canal water was turbid during the construction therefore turbidity curtains were placed at the canal mouth to prevent the turbidity from entering the Marine Sanctuary waters. The elevations of the canal bottom were surveyed to ensure compliance with the required final fill elevation. 11 H.6.c PW REF R Packet Pg. 1159 MONROE COUNTY - FLORIDA DR - 4337 - FL Construction including O&M Cost: $4,930,241 A&E including CEI Cost: $500,000 CULVERTS 1. CANAL # 472 between Mars and Venus lanes, Geiger Key. The project consisted of installing an elliptical culvert, 24 x 38 inches in diameter and 112 feet in length, underneath Boca Chica Road that connects two dead end Canals #470 and #472. To install the reinforced concrete pipe, approximately 200 cubic yards of sediment was excavated to -5.5 feet NAVD88 within a 120 square foot area with the top of the submerged culvert being placed at -3.5 feet NAVD88. Two 10 linear foot segments of concrete headwall were removed and replaced with reinforced concrete. Permanent manatee grates were installed at both ends of the culvert. Short term dewatering was required for this project and floating turbidity curtains were deployed at both ends of the culvert throughout the duration of the project. All excavated material was placed in a dump truck and moved to an approved location. 7 H.6.c PW REF R Packet Pg. 1160 MONROE COUNTY - FLORIDA DR - 4337 - FL 2. CANAL # 277 between Warbler and Killdeer lanes, Big Pine Key. The project consisted of installing a circular culvert, 60 inches in diameter and 184 feet in length, underneath State Road 4a (Watson Blvd.) that connects two segments of Canal #277. To install the reinforced concrete pipe, approximately 800 cubic yards of sediment was excavated to -10 feet NAVD88 within a 220 square foot area with the top of the submerged culvert being placed at -3.5 feet NAVD88. Two 20 linear foot segments of rock rip rap headwall were removed and replaced with rock rip rap and sand cement bags. These construction activities resulted in a total of 40 cubic yards of backfill. Permanent manatee grates were installed at both ends of the culvert. Short term dewatering was required for this project and floating turbidity curtains were deployed at both ends of the culvert throughout the duration of the project. All excavated material was placed in a dump truck and moved to an approved location. E- H.6.c PW REF R Packet Pg. 1161 MONROE COUNTY - FLORIDA DR - 4337 - FL Construction including O&M Cost: $623,248 A&E including CEI Cost: $200,000 III III "III ' IIRII AIR CURTAINS SYSTEM 1. Canal # 266 between Witters and Baileys lanes, Big Pine Key. Remove the damaged air curtains system and the install new air curtains with 20 diffusers placed on 10 weighted plastic bases placed on the canal bottom across the 40-foot-wide mouth of the canal. Each of the 10 weighted plastic bases contains 2 diffusers that connect to a manifold via 0.5-inch bottom line self -weighted tubing. The manifold contains 10 needle valves to allow for air flow adjustment. From the manifold, two 1.25-inch PVC lines connect to two equipment cabinets, each of which contains 5 compressors. 2. Canal # 287 between Hollerich and Atlantis Drives, Big Pine Key. Remove the damaged air curtains system and the install new air curtains with 22 diffusers placed on 11 weighted plastic bases placed on the canal bottom across the 45-foot-wide mouth of the canal. Each of the 11 weighted plastic bases contains 2 diffusers that connect to a manifold via 0.5-inch bottom line self -weighted tubing. The manifold contains 11 needle valves to allow for air flow adjustment. From the manifold, two 1.25-inch PVC lines connect to two equipment cabinets, each of which contains 7 compressors. 3. Canal # 290 between Avenue I & Avenue J, Big Pine Key PI H.6.c PW REF R Packet Pg. 1162 MONROE COUNTY - FLORIDA DR - 4337 - FL Remove the damaged air curtains system and the Install new air curtains with 20 diffusers placed on 10 weighted plastic bases placed on the canal bottom across the 40-foot-wide mouth of the canal. Each of the 10 weighted plastic bases contains 2 diffusers that connect to a manifold via 0.5-inch bottom line self -weighted tubing. The manifold contains 10 needle valves to allow for air flow adjustment. From the manifold, two 1.25-inch PVC lines connect to two equipment cabinets, each of which contains 5 compressors. Approximate Repair Construction Cost: $391,188.60 A&E Fees including CEI: $100,000 ORGANIC MATTER REMOVAL 1. CANAL # 266 • Due to hurricane Irma, organic sediment was displaced along the bottom of the canal causing the degradation of the water quality by depleting the dissolved oxygen and adding nutrients. The project will consist of removing of an average 2 feet of decayed organic muck from the canal bottom. Material will be excavated using a hydraulic vacuum dredge. The vessel -based vacuum dredge will pump the material through a temporary transmission line to a land side staging area for dewatering. The separated water (filtrate) will be discharged back into the canal, with testing of the filtrate being routinely performed pursuant to permitting requirements. The dewatered dredge material will be collected in roll -off bins and transported either to a beneficial reuse location or under manifest to an approved Landfill dependent on the characteristics of the sediment. Upon removal of the muck, the canal will be backfilled 1 foot of with clean fill material. The project will consist of removing 3,600 cubic yards of organic muck and the placement of 1,800 cubic yards of clean fill material within 47,916 square foot area. 2. CANAL # 290 • Due to hurricane Irma, organic sediment was displaced along the bottom of the canal causing the degradation of the water quality by depleting the dissolved oxygen and adding nutrients. The project will consist of removing of an average 2 feet of decayed organic muck from the canal bottom. Material will be excavated using a hydraulic vacuum dredge. The vessel -based vacuum dredge will pump the material through a temporary transmission line to a land side staging area for dewatering. The separated water (filtrate) will be discharged back into the canal, with testing of the filtrate being routinely performed pursuant to permitting requirements. The dewatered dredge material will be collected in roll -off bins and transported either to a beneficial reuse location or under manifest to an approved Landfill dependent on the characteristics of the sediment. Upon removal of the muck, the canal will be backfilled with 1 foot of clean fill material. The project will consist of removing 2,000 cubic yards of organic muck and the placement of 1,000 cubic yards of clean fill material within 25,700 square foot area. 3. CANAL # 83 between Grouper and Bonita lanes, Key Largo. • Due to hurricane Irma, organic sediment was displaced along the bottom of the canal causing the degradation of the water quality by depleting the dissolved oxygen and 10 H.6.c PW REF P Packet Pg. 1163 H.6.c MONROE COUNTY - FLORIDA PW REF DR - 4337 - FL adding nutrients. The project will consist of removing of an average 2 feet of decayed organic muck from the canal bottom. Material will be excavated using a hydraulic vacuum dredge. The vessel -based vacuum dredge will pump the material through a temporary transmission line to a land side staging area for dewatering. The separated water (filtrate) will be discharged back into the canal, with testing of the filtrate being routinely performed pursuant to permitting requirements. The dewatered dredge material will be collected in roll -off bins and transported either to a beneficial reuse location or under manifest to an approved Landfill dependent on the characteristics of the sediment. Upon removal of the muck, the canal will be backfilled with 1 foot of clean fill material. The project will consist of removing 4,100 cubic yards of organic muck and the placement of 2,100 cubic yards of clean fill material within 55,321 square foot area. U) U) 5. CANAL # 29 between Pigeon and Bunting Drives, Key Largo. • Due to hurricane Irma, the clean backfill material was displaced along the bottom of the U) canal causing the degradation of the water quality by depleting the dissolved oxygen a� and adding nutrients. The project will consist of placing of an average 2 feet of clean fill material along the bottom. The project will consist of the placement of 2,700 cubic �= yards of clean fill material within 35,719 square foot area. Approximate Repair Construction Cost: $2,700,000 A&E Fees including CEI: $500,000 CU LVF RTS 1. CANAL # 472 between Mars and Venus lanes, Geiger Key. • Due to hurricane Irma, organic sediment was displaced along the bottom of the canal causing the degradation of the water quality by depleting the dissolved oxygen and adding nutrients. The project will consist of cleaning the culvert using a vacuum truck to remove the accumulated organic sediment. 2. CANAL # 277 between Warbler and Killdeer lanes, Big Pine Key. Due to hurricane Irma, organic sediment was displaced along the bottom of the canal causing the degradation of the water quality by depleting the dissolved oxygen and adding nutrients. The project will consist of cleaning the culvert using a vacuum truck to remove the accumulated organic sediment. Construction including O&M Cost: $10,000 A&E including CEI Cost: $2,000 11 Packet Pg. 1164 Air Curtain Replacement Discussion/ Canal Skimming Services Potential Municipal Service Benefit Unit Assessment Program to Fund Canal Air Curtain O&M Services Ll , � +_1 a: Legend ■^,.., ZGG �. PAULTHAFAILYLEESTHAN 1OHNITE COUNTY R* HTB-B F-WAY BTRE EZB, RO ADS,AN d C AN ALB SINOLE FAMILY VAC ANT REiND EN TLA.L 9 4 DrPranic Removal and W1 AL��� Y JIM Legend F la 4 BILE HOPMESAt t � ! BIND LE F AAI ILY , y- Mp R Carl Z9a ° Most of the mobile homes along Avenue I were substantially damaged from Irma Canal 290 —Organic Removal and Air Curtain between Avenues I & J, Big Pine Key -Pre vs. Post Irma iy d -- II 1. , y 10-T �t�jdnt� 11,111MAU cwlgz�f R K3 HTS-0 F WMYSTREETS, RO ADS. AN D 0 ANAUS SIN G LE FAM ILY VArANTRESID ENTIAL Canal 287 Air Curtain between Hollerich and Atlantis Drives, Big Pine Key - Pre vs. Post Irma s r 1 gas,, - na # 5 presented the results at the August 15, 2oi8 commission meeting 2. It was reported that the results of the air curtain installed on canal 287 was of little effect 3. Results of the combination backfilling/air curtain restorations on canals 266 and zgo were less effective than other restoration types such as culverts and backfilling. 4. Reported that more time may be needed for full effect of the combination projects. 1. County does nothing and expends no County funds at this time. No O&M performed. County pays $0 and does not replace the air curtains. 2. County transfers the permits back to the homeowners and County replaces the resident's original PVC arm type of weed gate systems which existed on canals 287 and 290 and the ice eater pumps with floating docks which existed on canal 266 and County pays about $15,000. The maintenance and operation for the weed gate systems would then be turned back to the residents. 3. County replaces the County's air curtains in one or more canals. A. Residents on canal 266 have requested replacement. Decisions must be made as to who will pay the long term O&M costs (residents or County) and if the County will pay for a year or more of the O&M costs until a potential MSBU is put in place. • County pays $100,000 per air curtain to reinstall. FEMA reimburses 75%. • County sets up MSBU program, beginning with Notice of Intent at December 2018 BOCC meeting. • Homeowners pay 100% of the O&M under MSBU assessment after installation. County pays $0. B. Residents on canals 290 and 287 have not requested replacement at this time. 4. County does not replace any air curtains and sets up a Canal Skimming program on Big Pine Key instead. County pays $300,000, FEMA reimburses 75%. 9 Canal 75 skimmed during March to October 2oi8. Homeowners paid and installed own air curtain in July 2oi8 • Canal 83 skimmed during March to October 2oi8. • Homeowners do not want to pay for air curtain • No Air Curtain installed • Jetty offshore damaged in Irma, homeowners could repair it at their cost. Canal 75 —Backfilling Completed June 2018. Storm debris removed. Canal 83 —Backfilling completed in July 2017. Some storm debris removed. Uptions for Lanai 83 in Key Largo that never received an air curtain atter their restoration include: 0 install an air curtain, funds will need to be identified and an MSBU assessment set up 0 don't install an air curtain but fund a canal skimming program instead do nothing and advise the residents to either install their own air curtain or restore the jetty outside of the canal that was damaged by Irma, as that jetty would keep out most of the floating seaweed.