Environment resource summary - 1998-07-09


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Environment resource summary - 1998-07-09

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Title:
Environment resource summary - 1998-07-09
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English
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Box 2

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Subjects / Keywords:
Ranchers -- Law and legislation -- Florida
Okeechobee, Lake (Fla.) ( lcsh )

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University of South Florida
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University of South Florida
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The University of South Florida Libraries believes that the Item is in the Public Domain under the laws of the United States, but a determination was not made as to its copyright status under the copyright laws of other countries. The Item may not be in the Public Domain under the laws of other countries.
Resource Identifier:
035069031 ( ALEPH )
981477171 ( OCLC )
L41-00019 ( USFLDC DOI )
l41.19 ( USFLDC Handle )

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University of South Florida
Lorida

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PAGE 1

1 LAST DATE FOR GOVERNING BOARD ACTION: JULY 9, 1998 .. DRAFT Subject to Gove . rn,ng Board Approval ENVIRONMENTAL RESOURCE PERMIT STAFF REVIEW SUMMARY I.ADMINISTRATIVE ) \ APPLICATION NUMBER: 980213-6 PERMIT NUMBER: 47-00227-S PROJECT NAME: 101 RANCH LOCATION: OKEECHOBEE COUNTY, S5, 6, 7, 8, 9 & 17/T34S/R34E APPLICANT'S NAME: 101 RANCH OWNER'S NAME AND ADDRESS: 101 RANCH 208 NORTH PARROTT AVENUE OKEECHOBEE, FL ENGINEER: AGRICULTURAL ENGINEERING PA II. PROJECT DESCRIPTION ,PROJECT AREA: 1197.50 acres DRAINAGE AREA: DISTRICT DRAINAGE BASIN: S-65D RECEIVING BODY: FISH SLOUGH CLASSIFICATION: CLASS III PURPOSE: 1197. 50 acres The purpose of this application is to obtain authorization for the Construction and Operation of a surface water management (swm) system to serve 1,197.5 acres of pasture known as 101 Ranch. Staff recommends approval with conditions. BACKGROUND: On April 13, 1989, the Governing Board of the District authorized SWM Permit No. 47-00227-S for the Construction and Operation of a swm system to serve 201 acres of improved pasture and a homesite. The swm system consists of collector ditches that direct stormwater runoff, via pump, into a detention reservoir prior to gravity discharge to Fish Slough. 1

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vv{ : r u.q Ll.t EXISTING FACILITIES: This project, 101 Ranch, is located in northern Okeechobee County approximately four (4) miles north of Eagle Island Road (CR 724) and east of 101 Ranch Road (refer to Exhibit No. 1). The northern boundary of the property is Military Grade, an access road constructed for placement of military targets during exercises in the 1940's. North of the Military Grade is the Sanctuary. The majority of 101 Ranch is presently utilized as improved pasture for cattle grazing with shell mining activity on-going within Section 7. The site is relatively flat with a gentle slope towards Fish Slough, a manmade conveyance system that bisects the property and ultimately enters the Kissimmee River via the natural systems (Fish, Cypress and Chandler Sloughs) located south of the Eagle Island Road bridge. Poor system recovery, due in part to sediment deposition downstream of the Eagle Island Road bridge, has resulted in prolonged innundation within 101 Ranch and surrounding properties . Scattered depressional wetlands, primarily shallow freshwater marshes and h~mmock areas, are common throughout the site. PROPOSED FACILITIES: Proposed is a modification to 47-00227-S for an Environmental Resource Permit (ERP) for the Construction and Operation of a surface water management (swm) system to serve three (3) basins totalling 1,197.5 acres. The remaining property, under contiguous ownership by the applicant (1,217.5 acres}, is proposed to remain unchanged from existing. Basin 1 is 347.2 acres in size and is located south and west of Fish Slough (refer to Exhibit No. 2). The applicant proposes to utilize gravity drainage to Fish Slough for small (routine) storm events as presently occurs. A gravity structure consisting of 1-9.4' wide sharp crested weir with a crest at elevation~ NGVD, will direct stormwater runoff to Fish Slough during routine rainfall events (refer to Res "C" in table shown on Exhibit No. 2). During excessive rainfall or when the Fish Slough system can no longer accept gravity flows from the project, a proposed pump/reservoir system will be utilized to collect and store stormwater runoff within the basin. Proposed is a 2,000 GPM pump with on and off elevations of 67.0 and~NGVD, respectively, that will direct excess runoff from the basin into a 34.2 acre reservoir. The reservoir will provide storage and water quality treatment prior to gravity discharge to Fish Slough. The control structure serving the reservoir is proposed to consist of 1-4.7' wide sharp crested weir with a crest at elevation 70.0' NGVD, a 0.9' diameter circular bleeder orifice with an invert at elevation 68.0' NGVD and 40 LF of 18" diameter CMP culvert to Fish Slough (refer to TYPICAL BLEEDER & DISCHARGE STRUCTURE TABLE on Exhibit No. 2). An emergency overflow structure will direct excess stormwater from the reservoir back to the basin to protect the integrity of the reservoir dike. The emergency overflow structure is proposed to consist of 1-1.5' diameter drop inlet with a crest at elevation 70.7' NGVD (refer to TYPICAL OVERFLOW & RETURN STRUCTURE TABLE on Exhibit No. 2). All reservoir dikes, for 3

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------, all three basins, will have top widths of 12' and top elevations of 73.0' NGVD. Basin 2 is 245.9 acres in size and is located east of Basin 1 and south and west of Fish Slough (refer to Exhibit No. 2). This basin is proposed to contain a pump/reservoir system without the gravity capability that is proposed for Basins 1 & 3. Stormwater runoff will be directed to a 35.9 acre reservoir for storage and water quality treatment prior to gravity discharge to Fish Slough. An 1,800 GPM pump with on and off elevations of 65.5' and 64.5' NGVD, respectively, will direct excess basin runoff into the reservoir. Ditch plugs will be utilized to sever existing gravity connections to Fish p ~~l l~. S Slough (refer to Exhibit No. 2). In addition, a 12" diameter CMP culvert with an invert at elevation 66.0' NGVD will be installed between Wetland 30 and the ~v L~\J,~ collector ditch. This culvert will serve to facilitate the containment of stormwater runoff within this area, which is presently drained to Fish Slough via existing ditching. The reservoir control structure is proposed to consist of 1-4.7' wide sharp crested weir with a crest at elevation 70.0' NGVD, a 0.6' diameter circular orifice with an invert at elevation 68.0' NGVD, and 40 LF of 18" diameter CMP culvert leading into Fish Slough (refer to TYPICAL BLEEDER & OUTFALL STRUCTURE on Exhibit No. 2). An emergency overflow structure consisting of 1-1.5' diameter drop inlet with a crest at elevation 70.7' NGVD will serve to direct excess stormwater back to the basin to protect the integrity of the reservoir dike (refer to TYPICAL OVERFLOW & RETURN STRUCTURE on Exhibit No. 2). Basin 3 is 604.4 acres in size and is located north and east of Fish Slough (refer to Exhibit No. 2). This basin is proposed to be operated in a similar fashion to Basin 1. Gravity flow is proposed to Fish Slough during small (routine) rainfall events via two structures. These gravity structures are proposed to consist of 2-9.4' wide sharp crested weirs with crest elevations 1 at 66.3' NGVD (refer to RES #'s A & B under Gravity Flow Structures on ExhiDitJ Lrl . .::icv/-r No. 2). When the Fish Slough system can no longer accept gravity flows from this basin, use of gravity structures will discontine and a pump/reservoir lL.3 r# system will be utilized. Proposed is a 59. 4 acre reservoir that will serve to provide storage and water quality treatment prior to gravity discharge to Fish Slough. A 3,700 GPM pump with on and off elevations of 66.3' and 65.0' NGVD, respectively, will direct runoff from the basin into the proposed reservoir. The reservoir control structure is proposed to consist of 1-9.4' wide sharp crested weir with a crest at elevation 70.0' NGVD, a 1.2' diameter circular orifice with an invert at elevation 68.5' NGVD, and 40 LF of 36" diameter CMP culvert to Fish Slough (refer to TYPICAL BLEEDER & DISCHARGE STRUCTURE on Exhibit No. 2). An emergency overflow structure consisting of 1-18" diameter drop inlet with a crest at elevation 70.8' NGVD will serve to direct excess runoff from the reservoir back to the basin to protect the integrity of the reservoir dike (refer to TYPICAL OVERFLOW & RETURN STRUCTURE TABLE on Exhibit No. 2}. The utilization of additional storage areas (reservoirs) within the project will serve to attenuate stormwater runoff. This proposal serves to sever the existing pastures from Fish Slough by the construction of a levee, while 4

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-.l v,.) 0 ... ' providing a 150 LF setback {refer to Section A-A shown on Exhibit No. 2). To f prevent inflows from Fish Slough to Basins 1 & 3 via the gravity control f (S'-structures during extreme rainfall periods, the applicant proposes to install , flashboards above the fixed plate elevations described above {refer to Special w'~.77 Condition No. 16). The fixed plate elevations described are the minimum elevations allowable within each basin to prevent over-drainage. Also for asins 1 & 3, the applicant's consultant demonstrated that one-inch of water uality treatment is provided within on-site depressional wetlands when the ump-reservoir system is not used. In addition, turbidity barriers will be utilized during construction to control potential erosion and downstream sedimentation. BASIN INFORMATION: Area Basin Acres ONE 347.20 TWO 245.90 THREE 604.40 Reservoir Impoundments: Basin Name: ONE Interior dike side slopes: Exterior dike side Slopes: WSWT Normal/Dry Elev Ctrl Elev (ft, NGVD} (ft, NGVD} 66.90 66 66.00 64.5 66.30 65 Impoundment Type: MINOR 2.5:1 and 2:1 {H:V) 2.5:1 and 2:1 {H:V) 73.;_ofeet NGVD Top of Dike Elevation: Interior dike top width: 12.00 feet Exterior dike top width: Basin Name: THREE Interior dike side slopes: Exterior dike side Slopes: Top of Dike Elevation: Interior dike top width: Exterior dike top width: 12.00 feet Impoundment Type: MINOR 2.5:1 and 2:1 {H:V) . 2.5:1 and 2:1 {H:V) 7 3. 0 . feet NGVO 12.00 feet 12.00 feet 5 Method of Determination WETLAND INDICATOR ELEVATION WETLAND INDICATOR ELEVATION WETLAND INDICATOR ELEVATION

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Basin Name: TWO Interior dike side slopes: Impoundment Type: MINOR 2.5:1 and 2:1 (H:V) 2.5:1 and 2:1 (H:V) 73,0 feet NGVD Exterior dike side Slopes: Top of Dike Elevation: -Interior dike top width: Exterior dike top width: 12.00 feet 12.00 feet DISCHARGE STRUCTURE INFORMATION: Water Quality Structures: Basin ONE TWO THREE Str. # Bleeder Type 1 CIRCULAR ORIFICE 1 CIRCULAR ORIFICE 1 CIRCULAR ORIFICE Major Discharge Structures: Str. Basin # Description Dimensions .9' dia. .6' dia. 1.2' dia. ONE ONE' TWO THREE THREE THREE 1 1.5' dia. drop inlet 4 9.4' wide SHARP CRESTED weir 1 1.5' dia. drop inlet 1 3' dia. drop inlet 4 9.4' wide SHARP CRESTED weir 4 9.4' wide SHARP CRESTED weir Emergency Discharge Structures: Basin ONE TWO THREE Str. I Description 3 1.5' dia. drop inlet 3 1.5' dia. drop inlet 3 1.5' dia. drop inlet Pump Discharge Structures: Str. Invert Elev. {ft, NGVD) 68.00 68.00 68.50 Crest Elev. {ft, NGVD) 70.00 66.90 70.00 70.00 66.30 66.30 Crest/Invert Elev.{ft, NGVD) 70.7 70.7 70.8 on/off Basin I Capacity {6PM) elev. {ft, NGVD) ONE 2 2000 67/66 6 0) L ra u Cl)

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Pump Discharge Structures: Basin TWO THREE Discharge Culverts: Basin ONE ONE ONE TWO TWO THREE THREE THREE THREE Receiving Body: Basin ONE ONE ONE ONE TWO TWO TWO THREE THREE THREE THREE Str. # Str. # 1 3 4 1 3 I 3 4 4 Str. # 1 2 3 4 1 2 3 1 2 3 4 2 2 III. PROJECT EVALUATION Capacity (6PM) 1800 3700 Description 40' 1 ong, I. 5' di a. 40' long, 1.5' dia. 30' long, 3' dia. 40' long, 1.5' dia. 40' long, 1.5' dia. 40' long, 3' dia. 40' long, 1.5' dia. 30' long, 3' dia. 30' long, 3' dia. Receiving Body FISH SLOUGH RESERVOIR BASIN FISH SLOUGH FISH SLOUGH RESERVOIR BASIN FISH SLOUGH RESERVOIR BASIN FISH SLOUGH 7 CMP CMP CMP CMP CMP CMP CMP CMP CMP on/off elev. (ft, NGVD) 65.5/64.5 66.3/65

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<'V' Discharge Rate: This agricultural property discharges into the headwaters of Fish Slough, which ultimately discharges into Chandler Slough via Cypress Slough. Discharge limitations associated with the existing conveyance system prevent the Kissimmee River Basin formula (31.1 CSM) from being realized upstream of the Eagle Island Road bridge. The applicant's engineering consultant designed a gravity and pump/reservoir system that limits the design discharge to 9.8 CSM for this project. Discharge Storm Frequency: 10 YR-3 DAY Design Rainfall: 6.80 Basin ONE TWO THREE WATER QUALITY: Allow Disch Method of (cfs} Determination 5.3 CONVEYANCE LIMITATION 3.9 CONVEYANCE LIMITATION 9.3 CONVEYANCE LIMITATION Design Design Disch Stage (cfs} (ft, NGVD} 4.2 70.2 3.9 69.6 7.4 70.1 his application was submitted in an effort to alleviate prolonged inundation f . existing pastures during extreme wet periods. No formal change in land use s proposed as part of this application. Gravity flows will be maintained and utilized during routine rainfall events for Basins 1 and 3. Basin 2 will always utilize the proposed pump/reservoir system. For Basins 1 and 3, onsite depressional areas (wetlands) provtde one-inch of water quality treatment when the gravity systems are utilized. Water quality treatment, for each of the three (3) basins, will be provided within the reservoir systems and onsite depressional wetlands prior to gravity discharge to the receiving system. Utilization of the proposed reservoirs will help control downstream inundation by providing on-site attenuation, which is presently not available. Proposed control facilities for each basin were sized to adhere to an allowable discharge rate of 9 _ .8 CSM. In addition, turbidity controls will be utilized during project construction. ~f;. Cl,. \ ,"" }wr~~ Vol Vol vv\ ~• Treatment Req 'd. Prov' d ,, ..,,.,..q__ .;;;..Ba;;;;.,;s;;...;i:...:.;n:_ _______ M:..:.;e;;;..;t:..:.;h;.;;.o-=d _____________________ ..a...;( a~c~--'-f t~}~_.._( ___ ac~-=-f~t} ONE 34.2 acres RESERVOIR 26.00 65.00 TWO 35.9 acres RESERVOIR 20.50 30.00 THREE 59.4 acres RESERVOIR 50.40 120.00 8

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IV. ENVIRONMENTAL ASSESSMENT PROJECT SITE DESCRIPTION: The project site consists of existing improved pastures, oak hammocks, and shallow wetland areas. A series of interconnected ditches exist throughout the pasture areas. The upper headwaters of Fish Slough runs northwest to southeast through the property and is partially diked with an existing berm. The wetlands consist primarily of wet prairie and wet pasture habitat types. Vegetation includes pickerelweed and sawgrass in the deeper areas and wetland grasses, sedges and bulrush in seasonal saturated transitional wetlands. Soils are generally sandy with redoximorphic features near the surface and organic soils occurring in the inundated areas. A total of 31 wetlands (Exhibit 2) were depicted within the total applicantowned area contiguous to the project, 19 of which are within the project area. The acreage of the 19 wetland areas total approximately 357.9 acres. Wetlands are i.n fair to very good condition. Wetlands 18 and 20 are contiguous to the project area and portions totalling 41.4 acres are to be preserved for mitigation. This brings the total onsite acreage of wetlands and surface waters to 399.3 acres. On-site uplands include oak hammocks and improved pastures totalling . approximately 839.6 acres within the project area. In addition, 8.3 acres of a cabbage palm hammock to be preserved as a buffer to wetland mitigation areas is contiguous to the project area. This brings the on-site upland _ acreage total to 847.90 acres. EXISTING ON SITE WETLAND COMMUNITIES AND OTHER SURFACE WATERS: ID NO wos W06 W07 W08 W09 WlO Wll Wl2 Wl3 Wl4 WIS Wl6 Wl8 W20 W22 W23 TOTAL BIOLOGICAL ACREAGE CONDITION 3.40 GOOD/FAIR 4.90 GOOD/FAIR 6.40 GOOD/FAIR 1-5.40 GOOD/FAIR 10.10 GOOD/FAIR 3.00 GOOD/FAIR . 50 GOOD/FAIR 2.30 GOOD/FAIR 43.30 GOOD/FAIR 90.00 GOOD/FAIR I. 70 GOOD/FAIR 22. 60-GOOD/FAIR 5.20 VERY GOOD 36.20 VERY GOOD 62.70 GOOD/FAIR 2. 30 GOOD/FAIR COMMUNilY TYPE WET PRAIRIES WET PRAIRIES WET PRAIRIES WET PRAIRIES WET PRAIRIES WET PRAIRIES WET PRAIRIES WET PRAIRIES WET PRAIRIES WEl PRAIRIES WET PRAIRIES WET PRAIRIES FRESHWATER MARSHES FRESHWATER MARSHES WET PRAIRIES WET PRAIRIES 9 COMMUNITY ACREAGE 3.40 4.90 6.40 15.40 IO. IO 3.00 .50 2.30 43.30 90.00 1.70 22.60 5.20 36.20 62.70 2.30

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SPECIAL CONDITIONS 1. DISCHARGE FACILITIES: BASIN: ONE, STRUCTURE NO. 1: 1-.9' DIA. CIRCULAR ORIFICE WITH INVERT AT ELEV. 68' NGVD. 40 LF OF 1.5' DIA. CMP CULVERT. 1-1.5' DIA. DROP INLET WITH CREST AT ELEV. 70' NGVD. RECEIVING BODY : FISH SLOUGH CONTROL ELEV: 66 FEET NGVD. BASIN: ONE, STRUCTURE NO. 4: 1-9.4' WIDE SHARP CRESTED WEIR WITH CREST AT ELEV. 66.9' NGVD. 30 LF OF 3' DIA. CMP CULVERT. RECEIVING BODY : FISH SLOUGH CONTROL ELEV : 66 FEET NGVD. BASIN: TWO: 1-.6' DIA. CIRCULAR ORIFICE WITH INVERT AT ELEV. 68' NGVD. 40 LF OF 1.5' DIA. CMP CULVERT. 1-1.5' DIA. DROP INLET WITH CREST AT ELEV. 70' NGVD. RECEIVING BODY : FISH SLOUGH CONTROL ELEV : 64.5 FEET NGVD. BASIN: THREE, STRUCTURE NO. 1: 1-1.2' DIA. CIRCULAR ORIFICE WITH INVERT AT ELEV. 68.5' NGVD. 40 LF OF 3' DIA. CMP CULVERT. 1-3' DIA. DROP INLET WITH CREST AT ELEV. 70' NGVD. RECEIVING BODY : FISH SLOUGH CONTROL ELEV : 65 FEET NGVD. BASIN: THREE, STRUCTURE NO. 4: 2-9.4' WIDE SHARP CRESTED WEIRS WITH CREST AT ELEV. 66.3' NGVD. 2-3' DIA. CMP CULVERTS EACH 30' LONG. RECEIVING BODY : FISH SLOUGH CONTROL ELEV: 65 FEET NGVD. 22

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DATA TABLE FOR BLEEDER l DISCHARGE STRUCTURE TYPICAL BLEEDER de DISCHARGE STRUCTURE 12 LEVEE 3 ' Clll.L(CTION DITCH DATA TABLE FOR GRAVITY FLOV STRUCTURES ,_.' . •A• s c _, UIL ,~~ ~~ ,, UI Ur' I t' P -Plate Over Flow 73.0 73.0 65. 0 65. 0 3 . 0 3 . 0 40 66. 3 73. 0 73. 0 65. 0 65. 0 3 . 0 J . O 40 66. 3 73.0 73. 0 66. 5 66. 5 3 . 0 J . O 40 66.85 per,.,anent plates @ elevations on chart. SECTION A -A TYPICAL All levees except for the Fish Slough l'evee be on ex1.Siting bank or upland REs . I • f--12 --j CRST .._;-I _____ I Dl_ L LEVEE L DATA TABLE FOR OVERFLOV RETURN STRUCTURE W-1-" • .,,, OIi INV 1 INV 2 DI U2 L I 73. 0 70 . 7 67. S 67. S 1.5 1.5 40 2 73. 0 70 . 7 67. 5 67. 5 . 1.5 1.5 40 3 73. 0 70 . 8 67. 5 67. 5 t . S 1.5 40 TYPICAL OVERFLOW de RETURN STRUCTURE Soll4 W•lcl a. concret.a rn ••II CHl"I / 2 " X 3/4" lnta nal Bar !.,~ • • • Gel•. n reaoe lecl,--n -ll 11 :1 I,_, I L ___ J Riser Trash Rack Detail (NOT TO KAUI I DATA FOR PUMP LAYOUT ,::(~~~ : ~:::::-:t:'::-:=::-:'.-::.:. l••••••••••••Y • ,••:: , .:: :::::::. ::. • ,..-.-:::::::::. 101 RANCH MASTER PLAN AGRICULTURAL ENC/NEER/NC, PA. CA"1SII ctUl/t /fOtlll IA/a ,uao, "NI pr::ll~~J::r:.:::i~'.:l~:C~:i::J~I:l TYPICAL PUMP LAYOUT .. -::: . 4 . " . . LI 5 Ac 1 I / I / I/ J/ (J.31 1 -,~ 111 \ ::~ Ac t0f Ac ' > ':.."' ' "C" -~ ~~~--ii / \--..._ YI:\:,.. I . \ 'Y --(1 ', 2 . 2 :. _ _ I -. kr-;o -t 1/47-00227 I CONSERVATIO EASEMENT OVERFLOY 0 COLLECTION ---~ . DITCH DITCH ----PUMP PROJECT BNDRY PROPOSED CULV QJSCHARCE SILT SCREEN -........ -~CW 0 ) WETLAND EXISTING ( CULV(AT 0-••. APPROVED BY• PE .__ ___ ,.._,_.,___.1._""-"-=--'9"-"-'R 1 L. ____ -. _ r ,. = ,.oo


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