Documents/Nalle Grade Hydrolog… · Nalle Grade Park EcoPlanz, Inc. May 2017 1 Nalle Grade Park Wetland Mitigation, Monitoring & Maintenance Plan The 2.43 wetland functional loss

Nalle Grade Park EcoPlanz, Inc. May 2017

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Nalle Grade Park

Wetland Mitigation, Monitoring & Maintenance Plan

The 2.43 wetland functional loss due to direct and secondary impacts to the freshwater marsh

will be offset through restoring the hydroperiod to the historic seasonal high water level

(SHWL), removal of invasive exotic vegetation, reducing the cover coastal willow (Salix

carolinensis), planting the proposed berm with native wetland vegetation to the SHWL, and

supplemental planting of the freshwater marsh. The wetland functional gain is 3.10.

Additionally, a standard SFWMD Passive Recreation Conservation Easement will be recorded

over the preserved freshwater marsh wetland to insure the preservation and maintenance of

this wetland.

• Removal of Invasive Exotic Vegetation

Any plants listed as invasive by the Florida Exotic Pest Plant Council (FLEPPC) as of 2016

will be managed to have a cover of no more than 5% in perpetuity. Herbaceous invasive

exotic vegetation will be treated in place with an appropriate herbicide. Brazilian

pepper will be treated in place with foliar spraying using an appropriate herbicide.

Invasive exotic trees with a caliper of 6-inches or greater will be cut and removed from

the site with the stump being treated with an appropriate herbicide immediately

following the cutting. Invasive exotic trees with a caliper less than 6-inches may be

treated in place using an appropriate herbicide and treatment method (e.g. foliar spray;

trunk treatment). A dye must be used with the herbicide treatment.

• Reducing Cover of Coastal Plain Willow

The existing coastal plain willow trees will be cut and removed from the site. The

stumps will be treated with an appropriate herbicide immediately following cutting. A

dye must be used with the herbicide treatment. The coastal willow cover will be

reduced to no more than 10 percent of the freshwater marsh. Every five years, the

County will conduct maintenance to keep the willow cover below 25 percent of the

preserved wetland.

• Planting Plan for Berm Slope

The berm face abutting the preserved wetland will be planted with appropriate native

wetland vegetation from toe of slope to the historic SHWL (21.7 feet NAVD). Table 1

details the planting specifications. Figure 1 shows the planting pattern.


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Table 1: Berm Planting Specifications

Figure 1: Berm Planting Design

Sawgrass Swamp Fern Sawgrass

Common Name Scientific Name Size Number Plant Feet On Center

Planting Zone

Sand Cordgrass Spartina bakeri Bare Root 1,400 3 +/- 22 feet NAVD

Swamp Fern Blechnum serrulatum 1-gallon 500 +/-10 21.5 to 21.7 feet NAVD

Sawgrass Cladium jamaicense Liner 4,200 3 Below 21.5 feet NAVD to TOS

21.5 feet NAVD

21.7 feet NAVD

Berm TOS


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• Supplemental Planting Plan

The preserved wetland will be enhanced through the supplement planting plan to

increase the cover and diversity of appropriate native wetland vegetation. The 0.48

acre disturbed freshwater marsh will be the primary focus with the willow cover area

being the secondary focus. Table 2 details the planting specifications. Figure 2 shows

the planting areas.

Table 2: Supplemental Planting Specifications

Common Name Scientific Name Size Number Planting Zone

Broadleaf Arrowhead Sagittaria lantifolia Bare Root 500 A

Spikerush Eleochris interstincta and/or Eleochris palustris

Bare Root 320/1,500 A/B

Bulltongue Arrowhead Sagittaria lancifolia Bare Root 1,700 B

Pickerelweed Pontederia cordata Bare Root 1,700 B/C

Fragrant Water Lily Nymphaea odorata Bare Root 250 C

Spatterdock Nuphar luteum Bare Root 300 C

Fireflag Thalia geniculata Bare Root 330 C

Figure 2: Supplemental Planting Areas


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Mitigation Monitoring Plan

The preserved wetland will be monitored (Figure 3) for a minimum of five years to document

the restored hydrology and verify that 80% cover with appropriate native vegetation (i.e. FACW

or Obligate species) is achieved. Three point line intercept transects will be established to

quantify the vegetation cover. Photo-stations will be established at either end of the transect

with photos being taken in each of the cardinal directions (i.e. north-east-south-west) to

document the quality of the wetland. The monitoring events will include a baseline, time-zero

(i.e. after initial invasive exotic maintenance and supplemental planting), first annual (i.e. 1 year

after time-zero monitoring), second annual, third annual, fourth annual, and fifth annual (Table

3). If the success criteria of 80% cover of native FACW or obligate wetland species, less than 5%

cover of invasive exotic or nuisance vegetation with no one area of the preserve being

dominated by such vegetation, and no more than 25 percent cover of coastal plain willow

within 5 years, then no further monitoring is required.

If monitoring reports or other verified information show the preserved wetlands have been

negatively affected by the permitted development in a manner that is irreversible (such as

impounding the wetland and drowning the existing vegetation or a reduction in the

hydroperiod resulting in the transition of the wetland into upland/transitional habitat), the

permittee shall be required to submit a remediation plan within 30 days of notification by the

District’s Environmental Resource Compliance staff of such conditions. The remediation plan

may include onsite or offsite mitigation as necessary to address any deficiencies.

Table 3: Maintenance & Monitoring Schedule

Activity Date Completed Submit Report to SFWMD

Baseline Monitoring October 2017 November 15, 2017

Initial Invasive Exotic & Willow Treatment April 2018

Supplemental Planting June 2018

Time Zero Monitoring July 2018 September 1, 2018

Maintenance Treatment October 2018

Maintenance Treatment June 2019


1st Annual Monitoring November 2019 December 31, 2019


2nd Annual Monitoring November 2020 December 31, 2020


3rd Annual Monitoring November 2021 December 31, 2021


4th Annual Monitoring November 2022 December 31, 2022


5th Annual Monitoring November 2023 December 31, 2023


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Cost Estimate for Wetland Mitigation & Maintenance

Wetland Enhancement Planting Cost Estimate

Common Name Size Number Cost per Plant Installed (1)

Total Cost

Sand Cord Grass Bare Root 1,400 $1.05 $1,470

Swamp Fern 3-gallon container 500 $7.50 $3,750

Sawgrass Liner 4,200 $1.65 $6,930

Broadleaf Arrowhead Bare Root 500 $1.05 $525

Spikerush Bare Root 1,820 $0.90 $1,638

Bulltongue Arrowhead Bare Root 1,700 $0.90 $1,530

Pickerelweed Bare Root 1,700 $0.90 $1,530

Fragrant Water Lily Bare Root 250 $2.40 $600

Spatterdock Bare Root 300 $2.70 $810

Fireflag Bare Root 330 $1.05 $347

Total $19,130 (1) Based upon current market plant price x 3

Maintenance Cost Estimate

Maintenance Activity Fee per Acre (1) Acres Number of Treatments

Total Cost

Removal & Treatment of Invasive Exotic Trees

$2,500 0.47 1 $1,175

Removal & Treatment of Coastal Plain Willow

$2,500 13.25 1 $33,125

Maintenance Treatment $250 24.36 5 $30,400

Total $64,700 (1) Based upon hand removal. Cost may vary if conditions allow for mechanical removal.

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6200 WHISKEY CREEK DRIVE FORT MYERS, FL 33919 PH:(239) 985-1200 FAX:(239) 985-1258

ITEM NO. DESCRIPTION UNIT QUANTITY UNIT COST EXTENSION

EARTHWORK101-1 MOBILIZATION L.S. 1 $180,000.00 $180,000.00

102-1 MAINTENANCE OF TRAFFIC L.S. 1 $15,000.00 $15,000.00104 EROSION AND SEDIMENT CONTROL ( L.S. 1 $30,000.00 $30,000.00

110-1-1 CLEARING AND GRUBBING (AC.) L.S. 1 $60,000.00 $60,000.00

120-1-1 REGULAR EXCAVATION (NET CUT: OPEN WATER &MARSH AREAS) C.Y. 30,555 $4.00 $122,220.00

120-1-2 EMBANKMENT (NET FILL: BERM AND RETENTION AREA) C.Y. 44,197 $4.00 $176,788.00

120-1-3 IMPORT FILL C.Y. 13,664 $6.00 $81,984.00

120-3-5 REGULAR EMBANKMENT (520', 8' WIDE RECR. BERM NORTH) C.Y. 250 $6.50 $1,625.00

120-3-1 PERIM. SWALE GRADING, NORTH/WEST/SOUTH, (12' WIDE) L.F. 3,160 $8.00 $25,280.00

120-3-2 DITCH GRADING, BAYSHORE CONNECTION, SE, (75', 24' WIDE) L.S. 1 $8,000.00 $8,000.00

120-3-3 LATERAL DITCH GRADING (4,500 LF±) L.S. 1 $15,000.00 $15,000.00

120-3-4 REGRADE EXIST. SWALE, SE, (19' WIDE) L.F. 800 $4.00 $3,200.00120-3-5 IMPORT FILL C.Y. 0 $1.00 $0.00

SUBTOTAL= $719,097.00ROAD, ACCESS, AND SLOPE STABILIZATION

P-1 ACCESS ROAD BASE, 6" THICK, (1,260 LF) S.Y. 2,807 $6.00 $16,842.00

P-2 ACCESS ROAD SUBBASE STABILIZATION, 6" THICK S.Y. 3,717 $3.50 $13,009.50

P-3 GEOBLOCK MAINTENANCE ACCESS S.Y. 100 $7.00 $700.00

P-4 STABILISED 10% SLOPE MAINT. ACCESS S.Y. 117 $4.00 $468.00

P-5 4' WIDE STABILIZED ROAD SHOULDER (NALLE GRADE RD.) S.Y. 1,040 $3.50 $3,640.00

P-6 RIP-RAP, 4"-12" (12" THICK OVER GEOTEXTILE FABRIC) S.Y. 170 $30.00 $5,100.00

P-7 CRUSHED SHELL/STONE, RET. AREA SLOPE/BOTT. (4" THICK) C.Y. 2,337 $1.00 $2,337.00

P-8 SOD, BAHIA, BERM/SLOPE/SWALE/DISTURBED AREAS S.Y. 68,450 $1.80 $123,210.00P-8 ROCK GABION DIVERSION WALL (500') C.Y. 140 $35.00 $4,900.00

SUBTOTAL= $170,206.50MISCELLANEOUS

550-10-110 FENCE, STOCKADE, 8' HEIGHT LF 2,240 $10.00 $22,400.00

550-10-111 FENCE, CHAINLINK, 6' HEIGHT LF 1,620 $12.00 $19,440.00550-60-223 FENCE GATE, SGL, 16' OPENING, COUNTY DETAIL, PLANS EA 3 $2,200.00 $6,600.00550-60-224 FENCE GATE, STOCKADE, 12' OPENING EA 1 $800.00 $800.00

SUBTOTAL= $49,240.00DRAINAGE

D-1 CONTROL STRUCTURE #1 (DS #1) EA. 1 $5,000.00 $5,000.00

D-2 CONTROL STRUCTURE #2 (DS #2) EA. 1 $8,000.00 $8,000.00

D-3 TYPE "J" JUNCTION BOX W/ R&C (DS #6, 7, 8) EA. 3 $4,200.00 $12,600.00

D-4 TYPE "C" INLET (DS #5) EA. 1 $4,750.00 $4,750.00

D-5 TYPE "E" INLET (DS #9) EA. 1 $2,800.00 $2,800.00

D-6 ADJUSTABLE BOARD WEIR CONTROL STRUCTURE (DS #3, 4) EA. 2 $4,000.00 $8,000.00

D-6 8" PERFORATED ADS PIPE UNDERDRAIN L.F. 940 $15.00 $14,100.00

D-6 15" RCP L.F. 260 $35.00 $9,100.00

HOLE, MONTES INC.

PROJECT: NALLE GRADE PARK HYDROLIGIC RESTORATION ENGINEER'S ESTIMATE OF QUANTITIES BASED UPON CONSTUCTION PLANS CURRENT AS OF 2017-08-02 DATE: AUGUST 02, 2017 PROJECT #: 2013.046

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D-7 24" RCP L.F. 144 $65.00 $9,360.00

D-8 36" RCP L.F. 1,120 $80.00 $89,600.00

D-6 48" RCP L.F. 100 $100.00 $10,000.00

D-7 14"x23" ERCP L.F. 48 $40.00 $1,920.00

D-8 19"x30" ERCP L.F. 50 $70.00 $3,500.00

D-9 8" UNDERDRAIN CLEANOUT EA. 6 $200.00 $1,200.00

D-10 15" FLARED END SECTION EA. 6 $350.00 $2,100.00

D-11 24" DOUBLE MITERED END SECTION EA. 4 $1,200.00 $4,800.00

D-12 36" MITERED END SECTION EA. 2 $900.00 $1,800.00

D-13 36" ENDWALL (WING) EA. 2 $2,500.00 $5,000.00

D-14 19"x30" DOUBLE MITERED END SECTION EA. 1 $1,200.00 $1,200.00

D-15 STILLING BASIN WITH FLOAT CONTROL (#1, 2) EA. 2 $1,300.00 $2,600.00

D-16 MONITORING WELL WITH FLOAT CONTROL (#3) EA. 1 $2,500.00 $2,500.00

D-17 REMOVE 19"x30" DOUBLE M.E.S. EA. 1 $350.00 $350.00

D-18 STORMWATER PUMPING STATION COMPLETE EA. 1 $500,000.00 $500,000.00

SUBTOTAL= $700,280.00CIVIL / SITE DEVELOPMENT TOTAL= $1,638,823.50

PLANTINGP-1 PLANTING OPEN WATER; MARSH; WETLAND (7,500 EA.) LS 1 $75,000.00 $75,000.00

P-2 LANDSCAPE BUFFER LS 1 $30,000.00 $30,000.00

SUBTOTAL= $105,000.00

TOTAL= $1,743,823.50

10% CONTINGENCY $174,382.35SURETY AMOUNT $1,918,205.85