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01-2006 Congress Ave from Northlake to Alt A1A_Alignment Study ModificationsMETRIC ENGINEERING ALIGNMENT STUDY MODIFICATIONS CONGRESS AVENUE from Northlake Boulevard to Alternate A-1-A PALM BEACH COUNTY PROJECT Number 92606 January 2006 CONGRESS AVENUE from Northlake Boulevard to Alternate A -1 -A ALIGNMENT STUDY MODIFICATIONS PALM BEACH COUNTY PROJECT Number 926o6 Prepared by: Metric Engineering, Inc. 6415 Lake Worth Road, Suite 305 Lake Worth, FL 33463 561-966 -6550 January, 2oo6 Congress Avenue Alignment Study Modifications January 2006 TABLE OF CONTENTS TABLE OF CONTENTS 1 LIST OF EXHIBITS 2 1 INTRODUCTION 3 1.1_ Study Purpose 3 1.2 Project Overview 4 1.3_ Project Need 6 2 EXISTING CONDITIONS 7 2.1 Land Use 7 2.2 Geometric Features 7 2.3 Environmental 7 2.4 Soils 8 2.5 Wellfields g 2.6 Hazardous Materials 10 2.7 Drainage 10 2.8 Utilities 11 3 DESIGN CONSIDERATIONS 15 3.1 Roadway Design Criteria 15 3.2 Typical Section 17 3.3 Drainage 19 3.3.1 Water Quality 19 3.3.2 Water Quantity 20 3.3.3 Flood Protection 21 3.3.4 Proposed Drainage System 21 4 ALTERNATIVE ALIGNMENT ANALYSIS 22 4.1 Previous Alignment Studies 22 4.2 Description of Alternative Alignments 22 4.3 Establishment of Evaluation Parameters 30 4.4 Establishment of Parameter Relative Weights 30 4.5 Generation of Ratings 33 4.6 Ranking Each Alternative 35 5 RECOMMENDATIONS 37 1 Congress Avenue Alignment Study Modifications January 2006 LIST OF EXHIBITS Exhibit A, Location Sketch Exhibit B, Wellfield Map Exhibit C, Seacoast Utility Water Distribution Map Exhibit D, Seacoast Utility Sanitary Sewer Map Exhibit -E, Proposed Typical Sections Exhibit F, Alignment lA & 2A North Exhibit G, Alignment I & 2A South Exhibit H, Alignment 1B & 2B Roundabout Exhibit I, Alignment 1B & 2B North Exhibit J, Alignment 1B & 2B South Exhibit K, Matrix Weighting E3 it L, Preliminary Cost Estimate Exhibit M, Narrative Matrix Exhibit N, Evaluation Matrix Exhibit O, Alignment lA — Park Lane Intersection Alt. 1 Exhibit P, Alignment lA — Park Lane Intersection Alt. 2 Exhibit Q, Alignment I & 2A South — Alternate Al Intersection APPENDIX A Preliminary Ecological Assessment Report 2 5 9 13 14 18 25 26 27 28 29 31 32 34 36 38 39 40 Congress Avenue Alignment Study Modifications January 2006 1 - INTRODUCTION This project involves the extension of Congress Avenue from Northlake Boulevard to Alternate A -1- A as shown on the Palm Beach County Thoroughfare Plan and Comprehensive Plan. This report documents the existing conditions, the need for the project, the evaluation of several alternative alignments and the recommendation of one preferred alignment. The southern terminus of the alignment is the connection point of Congress Avenue at Northlake Boulevard and the northern terminus is aligned with the existing Richard Road east of Alternate A -1 -A. Several other alignments were evaluated by Palm Beach County and documented in a previous Alignment Study prepared and submitted to Palm Beach County Engineering by Metric Engineering in August 2001. Due to changes in land use, property values and other factors, Alignments 1 and 3 of the previous report are further evaluated in this study as an update to the earlier report. Those alternatives have been adjusted from their original alignment resulting in a total of five alternatives evaluated in this study. The alignments are described in Section 4.2 of this report. 1.1 Study Purpose The purpose of this Alignment Study is to: assess the corridor viability • evaluate modified alternatives • conduct a comparative analysis of alternatives • .recommend a preferred alternative If the County determines that this is a viable corridor, the selected alternative and the corresponding design/construction concept will be recorded in the Palm Beach County files for future use when the need for this project is evident. 3 Congress Avenue Alignment Study Modifications January 2006 1.2 Project Overview The beginning of the project at Northlake Boulevard will align with the Congress Avenue south of Northlake Boulevard. The end of this project at Alternate A -1 -A will be at the existing Richard Road and Alternate A -1 -A intersection. The proposed corridor passes through lands previously owned by the John D. and Catherine T. MacArthur Foundation and other various private owners. The existing land use consists of residential homes, mobile homes, business and commercial properties and a regional water treatment plant. Exhibit A, Location Sketch, shows the location of the project corridor and the surrounding area. At the present time the rental mobile home tract located west of Loquat Drive between the south side of Lychee Drive to the North side of Carambola Street, is under consideration for site plan approval by the City of Palm Beach Gardens under the name of-Hilltop Gardens and the mobile homes are being removed by the end of the year 2005. if the zoning use proposed by the new owner of the property is approved, the "Developers Conditions" will include the dedication of Congress Avenue right-of-way required by Palm Beach Countywithin the sub - division. 0 11 Congress Avenue Alignment "Study Modifications January 2006 EXHIBIT A: LOCATION SKETCH END PROJECT uj N Congress Avenue Alignment Study Modifications January 2006 1.3 Project Need The primary purpose of this link is to relieve traffic at the Northlake Boulevard intersection with Alternate A -i -A. The southbound to westbound and the eastbound to northbound turning movements at this intersection are over capacity and the completion of Congress Avenue would provide an alternative route to relieve congestion at the Northlake Boulevard/Altemate A -1 -A intersection. It is projected that up to approximately 20,000 vehicles per day will utilize this new corridor. However, construction of this portion of Congress Avenue is hindered by existing development. The presence of existing residential mobile homes will result in significant right -of -way costs and community impacts associated with relocating those residents affected by the project. - Should redevelopment of this area occur resulting in a change in the land use, the project costs may lower significantly. Benefits of the project include a reduction in user fuel costs, lower costs to users due to delays, improved level of service on nearby thoroughfare roadways, improved access to the community, reduction in .air quality impacts that result from stopped vehicles, and improved water quality treatment methods for the stormwater runoff. Detriments to the project include the high right -of -way cost and significant community impacts. The need for this project is especially important now that construction of Congress Avenue south of Northlake Boulevard is finished. Therefore, it is concluded that the construction of this project is needed. If the area is redeveloped, the community impacts will be less and the costs and impacts are warranted. I Congress Avenue Alignment Study Modifications January 2006 2 - EXISTING CONDITIONS 2.1 Land Use The extension of Congress Avenue will meander north through the City of Palm Beach Gardens, the Village of North Palm Beach and unincorporated P.B.C. parcels. The land currently supports a number of permanent mobile home residences. The mobile home community west of the east section line of Section. 18 was a rental community presently proposed to be developed. The homes east of the same section line are privately owned. Seacoast Utility Company owns and operates a regional water treatment plant near the north end of the project. The vacant land south of the treatment plant, owned by the City of Palm Beach Gardens, contains three wells for the water treatment plant. (Wells No. 1, 2 and 6). Business and commercial properties are located east of Old Dixie Highway. 2.2 Geometric Features The south end of the project connects just north of the signalized intersection at Northlake Boulevard: -The north end connects to an existing signalized intersection at Alternate A -1 -A and Richard Road. Near Alternate A -1 -A, the roadway crosses the FEC railroad tracks. This crossing requires the modification of the existing Richard Road railroad crossing. 2.3 Environmental No wetland areas were found in any of the alignments that would pose ecological constraints to development. e PRELIMINARY ECOLOGICAL REPORT Appendix A for additional details. 7 Congress Avenue Alignment Study Modifications January 2006 2.4 Soils The Palm Beach County Soil -Conservation Service maps were reviewed to conduct a preliminary assessment of the underlying soils. Underlying this area are Arents -Urban Land Complex soils and St. Lucie Urban Land Complex soils. The arents Urban Land Complex soils are found on the western portion of the project near the C -17 canal. According to the SCS description this complex consists of nearly level, somewhat poorly drained, sandy soils and Urban land. This soil was formed in thick layers of sandy fill material that were placed over low, wet mineral soils to make the areas suitable for urban use. The soil is generally rapidly permeable. The St. Lucie Urban Land Complex soils cover the eastern portion of the project, which will include the majority of the roadway. This soil consists of nearly level to sloping, excessively drained deep, sandy soils on long, narrow, dune - like ridges and isolated knolls typically found near the Atlantic coast. The water table is generally deep, over 6 feet, and the permeability is very rapid. For both areas, the Urban Land Complex description indicates that a high percentage of the land is now covered with streets, sidewalks, driveways, patios, buildings and other structures. 2.5 Wellfields Seacoast Utility Company operates a water treatment plant in the project vicinity known as the Richard Road Water Treatment Plant (TWP). There are -eight potable water supply wells around this water treatment plant near the north end of the project. Five of the eight wells are within the Richard Road WTP property, the other three wells are located in easements to the south of the plant as shown on Exhibit "B ", Wellfield Map. Palm Beach County provides regulatory criteria to protect and prevent potable water supply wells from contamination. These criteria can be found in Article 14 Environmental Standards, Chapter "B" Wellfield Protection of the County's Unified Land Development Code. The proposed Congress Avenue extension will be constructed near wells 1 and 2 and will cross through the zones of influence of each of these wells. These zones are calculated based on the rate of movement of ZONE 1 (TYP.) ZONE 2 i . i 1 CHARD ZONE 3 l # I T. P. 41 t HiAD* ROAD Ci x its rl _ %.` ! � �'`I: I'—'' ; � . ` � ,; � - - -, � i �\ '•,— a KUHOU.iT- SiA —._.t� :1...tr e I SET ;; o as �! ! :c a e CAAAN90tA 1 2 \.S t 6» r 1 •� ,,�, � `� ``` `` .` •-� -6 a• __ •. � �(! -FTk 00 � LAVc_� =i -_ - 1. t • • �CORKW000.- S.TA °ET rr r i CA 0 _E`STRc -ET 'L A HE uj o _ BAUYA`j lul L ANNE t(D C 16`! 16' 10" 12 \. — - - - -- Ln NORTP !-A. = ELVC. -- -- - - -20 ! 6" ° 2 -559 -- - - - - -- 2 -776 - - -- \ - i- 2 -545 i 6' - Y !' 10' - 2 -645 !� ! WELL INFLUENCE LINES CONGRESS AVENUE FIGURE ND. rro C� ty 2�' A B Project No, WELLFI ELD MAP Congress Avenue Alignment Study Modifications January 2006 ground water in the vicinity of the wells at a specified pumping rate with zone one being the most critical. Palm Beach County does not allow exfiltration systems to be constructed in zones 1 or 2. The Palm Beach County Department of Environmental Resource Management requires a permit for any new non - residential development of more than 25 units within zones 1, 2, 3 or 4. However, exemptions are granted for facilities that will not handle, store, produce or use any regulated substances, and for construction projects whose contractors, subcontractors, laborers, materialmen, and employees use the applicable Best Management Practices (BMP) as described in the Unified Land Development Code, Article 14 Environmental Standards, Appendix 3. It is recommended that the drainage system be designed such that no exfiltration trenches will be located in wellfield zone 1 or 2, that the contractors use the BMP defined in the County's code, and that all design considerations be in accordance with Palm Beach County Unified Land Development Code and applicable Ordinances. 2.6 Hazardous Materials The public records were investigated for the presence of potential contamination sites near the project corridor. Currently, the lands adjacent to the proposed project are residential, and there are no sites considered as potentially contaminated. Research ofpublic records and field observation did not reveal any sites with the potential for hazardous materials in the immediate vicinity of the project corridor. 2.7 Drainage The site is located on a coastal ridge with the high point of the ridge running approximately on Old Dixie Highway, parallel to the railroad tracks. Stormwater drains by sheet flow over the ground from Old Dixie Highway to the west and south. There are a few inlets at the west end of the site that collect stormwater and discharge into the C -17 canal. East of Old Dixie Highway the stormwater 10 Congress Avenue Alignment Study Modifications January 2006 flows towards the east where it is collected in inlets draining north along Alternate A -1 -A and discharging into the C -17 canal. There is no evidence of any water quality or storage being currently provided. There may be some exfiltration systems within the DOT rights -of -way; however, the majority of the site drains overland in the mobile home community and discharges directly into the C -17 canal. 2.8 Utilities Utilities within the project vicinity include Florida Power and Light, Southern Bell, Seacoast Utilities, and Adelphia Cable. The following was compiled from information provided by the above mentioned utility companies: • FPL has overhead power lines, which travel on the south side of Richard Road and within the Hilltop Gardens Mobile Home Community. Existing overhead and underground service lines are found to the east and west of High Point Drive and north -south along - Old Dixie Highway and along Alternate A -1 -A. • BellSouth has acknowledged that they have both major telephone lines buried under Northlake Boulevard and individual service lines to the mobile homes. • Seacoast Utility Company owns and operates a regional water treatment plant located on Richard Road near the north end of the project. From this facility, Seacoast provides water service for the mobile home park and the neighboring communities. Therefore, they have a number of underground watermains as shown on Exhibit C, Seacoast Utility Water Distribution Map. Sewer from this area is transported via underground gravity and force mains, as shown on Exhibit D, Seacoast Utility Sanitary Sewer Map to a treatment plant located near PGA Boulevard and the Turnpike. 11 Congress Avenue Alignment Study Modifications January 2006 • Adelphia Cable has existing underground and above ground facilities within the project vicinity. These facilities serve the Hilltop Gardens Mobile Home Community. Adelphia Cable's plans should be reviewed during the design phase so that their facilities are accurately shown on the construction plans. 12 4 7 �7--E 12' N V J A AV LANE % - -- STREET 2 C31, -C (n ---------- P 122657 - \55 f V S Q :2.11/2; 'GAL V J EE"T PL MOSA V 2". F -84 14Y 2 C, 6 17 I , V —HALNGO 10 , 12 " _J 2-559 V ...... Lh . 19 20 6. NORTHLAXa BLVD. 2-77a - -- -- - - -- iI 10, Y 16 10, 2-645 I. 2-645 CONGRESS AVENUE from Northlake LBlvd. to*Alt. A-1-A Seacoast Utility Water CountY Project No. 926o6 .1 Distribution Man FIGURE- NO- C RICHARD PD. % H. T. P. Y ;I r 16, \J, ROAD 2 16 _"_------- - -_ -11 ------ En _J Ld C: U 4 7 �7--E 12' N V J A AV LANE % - -- STREET 2 C31, -C (n ---------- P 122657 - \55 f V S Q :2.11/2; 'GAL V J EE"T PL MOSA V 2". F -84 14Y 2 C, 6 17 I , V —HALNGO 10 , 12 " _J 2-559 V ...... Lh . 19 20 6. NORTHLAXa BLVD. 2-77a - -- -- - - -- iI 10, Y 16 10, 2-645 I. 2-645 CONGRESS AVENUE from Northlake LBlvd. to*Alt. A-1-A Seacoast Utility Water CountY Project No. 926o6 .1 Distribution Man FIGURE- NO- C I M RICHARD PD. X L; W9R6-90 A"' ------------ it ------------ -------------- 0 b A?AMSOLA Xcj 11,5 1 & —A % it I Al -j % jcn' ca 0 TREE T J L S -0 TAHGEAIINE LANE .6 L ° 6 AEET LYCHEE. -S T 6" PLU46SA LANE 6. T Up Lu I' I, 0 ___BANYAN LAN= CL 6 6- cn 10, L. S. 6 C3 c3t I CD 18 17 % CONGRESS AVENUE from Northlake Blvd. to"Alt. A-1-A - County Project No. 92606 19 20 ------------------------------------- K - HART Seacoast Utility FIG U Rr- ho. Sanitary Sewer Map 'D Congress Avenue Alignment Study Modifications January 2006 3 - DESIGN CONSIDERATIONS 3.1 Roadway Design Criteria The preliminary designs for all alternatives are based in the following design features: 1. Design Speed - 30 mph minimum, 45 mph desirable. 2. Level of Service D is a desirable minimum. 3. 110 foot right -of -way minimum from north of Northlake Boulevard intersection to Park Lane and 80 foot right -of -way minimum along Park Lane and Richard Road to Alt. A -1 -A intersection. 4. Lane widths of _12_ feet minimum for 110 foot Right -of -Way; 11 feet for 80 foot Right -of= Way. 5. Paved shoulder of 4 feet adjacent to the outside curb and gutter (3 feet for the 80 foot ROW). 6. 24 foot grassed median for 110 ft. right -of -way and 12' median (raised island or auxiliary lane), for 80 ft. right of way. 7. Longitudinal grades of 0.3% minimum and 6% maximum. 8. Border Widths of 16 feet on each side to accommodate a 2 foot curb and gutter, and 5 foot grassed utility strip, 6 foot concrete sidewalks and 3 foot of grass at the right-of-way line, for 110' right -of -way; and border with of 9 feet for 80' right -of -way. 9. Horizontal Curvature with 410 foot minimum radius for 35 mph Design Speed (5 % superelevation) or 30 MPH Design Speed (reverse crown), 716 foot minimum radius for 40 MPH Design Speed (reverse crown) or 955 feet minimum radius for 45 MPH (reverse crown). 10. _ Drainage System to provide water quality treatment for the first flush of runoff, and one travel lane, northbound and southbound, above the 25 year 3 day storm stage. 1. Terminus Points. The southern terminus point must align with Congress Avenue south of Northlake Boulevard (Palm Beach County Project No. 92606A). The northern terminus must connect to Alternate A -1 -A approximately at the existing Richard Road intersection. 12. Intersection Geometrics - This project involves two major intersections: Northlake Boulevard and Alternate A -1 -A. The intersection geometry should conform to 15 Congress Avenue Alignment Study Modifications January 2006 Palm Beach County's Thoroughfare Right -of -Way Standards. The need for expanded intersections, as may be required for additional turn lanes, will be as determined by the Palm Beach County Traffic Division. 13. Roundabouts — Proposed roundabouts to conform to Palm Beach County Engineering Standards and Specifications. 16 Congress Avenue Alignment Study Modifications January 2006 3.2 Typical Sections The Palm Beach County Thoroughfare Map currently indicates a 110 foot wide right -of -way (ultimate six lane divided) for this section of roadway. Data obtained from the Palm Beach County Metropolitan Planning Organization indicates that approximately 20,000 vehicles ultimately will travel this corridor per day and the MPO 2020 Cost Feasibility Plan reflects an ultimate four lane facility. This estimated traffic volume requires only a 4 lane roadway. The County Roadway Production staff advised to base this preliminary alignment study assuming 110 foot maximum and 80 ft. minimum right -of -way which can accommodate an ultimate four lane divided typical section. It is our recommendation that Palm Beach County proceed with a Comprehensive Plan Amendment, revising the ultimate right -of -way for this section of Congress Avenue. Exhibit E, Proposed Typical Sections, shows the typical sections proposed for this project based on a 110 and an 80 foot wide. right -of -way. All of the proposed alternatives will use the same typical sections. The typical sections were designed to provide 4 travel lanes, a grassed or paved median and pedestrian accommodations. The 16 foot outside border will be included in accordance with the Roadway Design Criteria, Item No. 8 for the 110 ft. right-of-way. The 80 -foot right -of -way will provide a 9 ft. outside border width which includes curb and gutter and six ft. concrete sidewalk. Lane widths and paved shoulders are consistent with the current FDOT and Palm Beach County guidelines. Design criteria for urban arterials with a minimum design speed of 35 m.p.h. was used to develop the typical sections. Individual elements of the typical section were reviewed to determine if reduction in lane widths or sidewalk width could substantially improve the typical section. It was concluded that no substantial benefit would be realized from reductions in lane widths or sidewalk widths and that the desirable standards should be achieved to the greatest extent possible. 17 Congress Avenue Alignment Study Modifications January 2006 EXHIBIT E: TYPICAL SECTION 6 GRUBBING STANDARD CLEARING L GRUBBING R/W L I NE ROADWAY 55' STANDARD CLEARING & GRUBBING STANDARD CLEARING & GRUBBING 0' 40' 40' 16' R/W LINE R/W L I NE 12' 2' 9' 9' 2' 12' 12' 4' 9' 3' II' II' 6' 6' Il' U, 3' 9' SEED L IIILCH umt na - MULCH 6' 5' 2' OR 500 OR S00 Wf4L na awE 6 500 2 1 - _2:. 6 111 Sol I 6' LEVEL _ CONSTRUCTION 6• 1, LEVEL I_ uausoF conslaucnoN LEVEL I .PROFILE LIMITS OF PROFILE _ I GRADE GRADE ILEYEL CONSTRUCTION - -- LINE PROFILE LINE EXIST IN GROUND(T YP. 1 2 l -D.561 (0.001 10.001 (- 0.56)" GRADE -LINE -t - - - 2% - - - - - -- - -- = EXISTINGGROUND ITYPI 11:1 DESIRABLE) P I' TYPE SI I I TYPE 'F" ITYP.1 RC70 PRIME COAL 4' GONG SIDEWALK lo.00l (MOD.1 AT 0.10 GAL./SQ.YD. _ 6' AT DRIVEWAYS ITYPI ASPHALTIC CONIC. TACK COAT ) - 12' STABILIZED ( -0.621 CURB 6 GUTTER I SUBBASE 175 P.S.I. 1 F.B.V. I (-0.62) TYPE 'F' ITYP.1 (DOUBLE COURSE) (TYPE Cl 3:1 wx. z% ____.. �_ 110' RIGHI.OE•MY 2% 2% I ----27 I /:1 18 BLEI �11 /' GONG. SI OEMLH I' TYPE 5.111 6' AT DRIVEWAYS Ii YPI 1 1/2" TYPE S -1 STING GROUND ITYP.1 ASPHALTIC GONG. CURB 6 GUIiFR DOUBLEROU (DOUBLE COURSE( - - TYPE "F'IFYP.I 12' STABILIZED AC-70 PRIME COAT SUBBASE 175 P.S.I. 1 F.B.V. AF 0.10 GAL./SQ.YD. ITYPE Cl IACK COAL - AI 0.05 GAL. /SQ. YD. 84' RICHI•� "DIY • - F( ROADWAY STANDARD CLEARING 6 GRUBBING STANDARD CLEARING L GRUBBING R/W L I NE 55' 55' 0' 16' 4 12' 12' 2' 9' 9' 2' 12' 12' 4' SEED SEED L IIILCH SEED&MICH - MULCH 6' 5' 2' OR 500 OR S00 - OR SOD - 500 - L MI IS OF I LEVEL _ CONSTRUCTION 1, LEVEL .PROFILE PROFILE _ I GRADE GRADE LINE LINE EXIST IN GROUND(T YP. 1 2 l -D.561 (0.001 10.001 (- 0.56)" 2. 2% - 3:i CURB & GUTTER 11:1 DESIRABLE) P I' TYPE SI I I TYPE 'F" ITYP.1 RC70 PRIME COAL 4' GONG SIDEWALK 1 1/2' TYPE S•1 (MOD.1 AT 0.10 GAL./SQ.YD. _ 6' AT DRIVEWAYS ITYPI ASPHALTIC CONIC. TACK COAT - 12' STABILIZED AT 0.05 GAL.ISQ. Y0. CURB 6 GUTTER 8' BASEROCK SUBBASE 175 P.S.I. 1 F.B.V. TYPE 'F' ITYP.1 (DOUBLE COURSE) (TYPE Cl 110' RIGHI.OE•MY - 18 �R/WLIHE SEED L 6' MILCH OR SOD L MI 75 OF 1, CONSTRUCTION LEVEL I EXISTING GROUND(TYP.) 2' I 3:1 VAX. 14:1 DESIRABLEI r Congress Avenue Alignment Study Modifications January 2006 3.3 Drainage 3.3.1 Water Quality Construction projects with stormwater discharge facilities must meet the State "Surface Water Quality Standards" as set forth in Chapter 62 -302 and 62 -25 Regulations of Storm Water Discharge of the Florida Administrative Code. The following agencies regulate stormwater quality: • Environmental Protection Agency (EPA) (NPDES permit) • Department of Environmental Protection (DEP) • South Florida Water Management District (SFWMD) • Palm Beach County Department of Environmental Resource Management ( PBCDERM) Construction projects in Florida that satisfy the State's water quality requirements will fall under the EPA's general permit by submitting a Notice of Intent. The DEP delegated their permit authority to the South Florida Water Management District. PBCDERM does not require the Palm Beach County Roadway Production Division to process permits through their office, but they are available to offer assistance in the design process. Therefore, the only agency that will regulate water quality for this " project is the SFWMD. The current water quality criteria for construction projects is, that one or a combination of the following be provided: • wet detention of either the first inch of runoff from the entire development project or the first 2.5" of runoff from the impervious areas (excluding roofs and water bodies), whichever is greater • dry detention of 75% of the amount computed for wet detention 19 Congress Avenue Alignment Study Modifications January 2006 3 • retention of 50% of the amount computed for wet detention The South Florida Water Management District Basis of Review has a provision for applying different standards to urban public highway projects; however, based on direction from Palm Beach County, the design of this prof ect will attempt to meet the general requirements presented above for water quality. 3.3.2 Water Quantity The agency controlling the receiving water body can control the amount of stormwater that overflows the water management system and discharges into the receiving water body. The prof ect area falls within the South Florida Water Management District C -17 Drainage Basin that limits discharge to 62.7 cfs per square mile during the 25 year - 3 day storm. To limit the rate of discharge the stormwater runoff must be impounded and then slowly released from the stormwater management system. Therefore, sufficient storage capacity must be provided in the stormwater management system to satisfy this requirement. The South Florida Water Management District will review the proposed design for stormwater quantity; however, they have indicated that their primary concern for roadway projects is to verify that the design provides adequate water quality as described above. -Therefore, the proposed roadway will be designed to limit the discharge to the pre- development rate of discharge that is currently entering the receiving water body. 20 Congress Avenue Alignment Study Modifications January 2006 3.3.3 Flood Protection In addition to the design criteria described above, the proposed stormwater management system should be designed to provide sufficient storage capacity so that at least one travel lane in each direction is clear during the 25 year - 3 day storm event. The roadway culverts should be sized to accommodate the 3 year, 24 hour storm. The minimum roadway elevation should be located sufficiently above the wet season water table to provide a dry roadway base. At least 2 feet of clearance should be maintained between the wet season water table elevation and the roadway base material as recommended by the DOT for roadways of primary importance such as roads with 4 or more lanes. 3.3.4 Proposed Drainage System The proposed drainage system should consist of either a wet detention pond, dry retention pond, exfiltration trench, or combination of these methods adequately sized to meet the criteria described above. At this preliminary stage, based on rough assumptions of the soil conditions, it is estimated that an exfiltration trench length of approximately 1000 feet would satisfy the water quality requirements., It is estimated that 2.65 acres are needed to provide additional storage for flood protection and discharge restrictions. A detailed analysis should be performed if it is decided to proceed with this project. Two possible sites are considered at the south end of the project. One on the east side of Congress Avenue where the unit cost of mobile homes to be acquired maybe lower than the site on the west side, but the connection of the pond to the C -17 Canal requires 700 L.F. of 30" R.C.P. The other site is located on the west side of Congress Avenue. The connection of the pond to the C -17 Canal will require 115 ( + / -) L.F. of 24" R.C.P. 21 Congress Avenue Alignment Study Modifications January 2006 4 - ALTERNATIVE ALIGNMENT ANALYSIS The design considerations developed in Section 3 were used to establish alternative alignments that _ could be analyzed to determine the most viable alternative for the extension of Congress Avenue to Alternate A -1 -A. Eight alternatives have been developed and evaluated in this study. 11 1 4.1 Previous Alignment Studies S -everal alignments were tvaluated by P--ahn Beach County and-documented in aprevious ��tig!nn, —nt Studies prepared and submitted to Palm Beach County Engineering by Metric Engineering in August 2001. 4.2 Description of Alternative Alignments Due to changes in land use, property values and other factors, the proposed Alternative Alignments consider two segments, each: from the connecting point of Congress Avenue north of Northlake Boulevard to Park Lane and from Park Lane to Alternate A -1 -A intersection. The following alternatives have been developed and analyzed for this study: • Alignment 1A and 2A (North) — Exhibit "F" - This alternative extends north from the connecting point of Congress Avenue north of Northlake Boulevard, travels through a 1000 ft. radius curve to the north -east and then turns in an easterly direction with a 546 ft. radius curve to connect ultimately to Richard Road. The Design Speed is 35 M.P.H. (Reverse Crown) This alignment passes between wells No. 1 and No. 2 and follows the same alignment as Alignment I of the original Study with the only changes being the 22 Congress Avenue Alignment Study Modifications January 2006 northern curve has a 546 ft. radius and acquisition of additional right-of-way between Old Dixie Highway and Alternate A -1 -A, is limited to the north side of the existing right -of -way. The -existing railroad crossing and the Alternate A -1 -A intersection require modifications. ■ Alignment 1A and 2A (South) — Exhibit "G" - This alignment is similar to Alignment IA and 2A (North) with the exception that right -of -way acquisition between Old Dixie Highway and Alternate A -1 -A is limited to the south side of the existing right -of -way. Alignment 1B and 2B (Roundabout) — Exhibit "H" — This alignment extends north from the connecting point of Congress Avenue north of Northlake Boulevard, continues through a reverse curve to the northeast to connect to Park Lane avoiding the existing water treatment plant and connecting to Richard Road thru a roundabout, continued past Richard Road with a connection to Alternate A -1 -A. The curves of this modified alignment radii of 660' (reverse crown) and 1200' (normal crown) respectively. From the roundabout, the alignment continues along the existing alignment of Richard Road with 80 foot of right -of way and connects to the Alternate A -1 -A intersection. Acquisition of right -of -way between Old Dixie Highway and Alternate A-1 -A is limited to the south side of the existing right -of -way. This alternative has a Design Speed of 35 M.P.H with roundabout restrictions. The existing railroad crossing and Alternate A -1 -A intersection require improvements. • Alignment 1B and 2B (North) — Exhibit "I" -This alignment is similar to Alignment 23 Cgngress Avenue Alignment Study Modifications January 2006 1B and 2B (Roundabout) however, the roundabout is replaced by a 410 -foot radius curve with a superelevation rate of 5 % appropriate for 35 M.P.H Design Speed. The superelevation rate may be reduced to reverse crown to minimize superelevation transition effects into the railroad crossing. This change will reduce Design Speed to 30 M.P.H. Acquisition of right -of -way between Old Dixie Highway and Alternate A -1 -A is limited to the north side of the existing right -of -way. • Alignment 1B and 2B (South) Exhibit "J" - This alternative is similar to Alignment 1B and 2B (North) , with the exception that right -of -way acquisition between Old Dixie Highway and Alternate A -1 -A is limited to the south side of the existing right - of- -way. FM 1 i` rs i t ti t no ,j 1 • e LU /, + .i. �11 %,1' +�` }� I - - k I .k�Ri!..�ii►r•'+i�` _� w w w 4, � e x z rf'; �i Y., I • ! W f I. W, f 6 j i„ ►yf�w 3 0 co S' .O O /f -'M•�. a '7. I. f�, la ':= C . , i -� •��iJ lt,� .d , inn :,`, Q 11J a 9= N 7 W LU S ji �C � N Z W -:X co Q'�" _ � � � T j F �r �//r � ' tr - _ - ___ i �:. 3 y `•,J" M V . sY ; • •ate ; - Ltl 0. U) LU -c=C Al S' 3 J�N O 3 z w CIO w W c> '�`' I r W¢ Z TY \ � asr +. � � 'y ;}� J4 r i , •e t. ' '�+L f• •1 � ' t,: rt s< ¢ co c. w w EXHIBIT F >._ f 4 Y t [ .L I l yS iI i 1 - a - lk o tl _ •A "�`/ r w "y�� /' "�•• I: 'n�. ra, •1' � _ - IV. 'i 1 'fY}W(illr cn C/) 1j4tfr z w sn LU l 1 j i y t1 ¢ J y w w — n , in iw .I r CO LU Iz� uj t q•. �! a� y A. Nkl t.+� I is j :.f;I' + i Z O �+ , �p7� `i '� .•� � � rr ~ ' `. i I�� ' �. L. CIO,> - Q S 3A N d ,HJI. LJL- 4 T Ofd` ° N LLJ 4. SL '� � Z Z . °d��/ it � a T �'� ' is iW y 'i�,�►!�' •'tl, �t we �' ? � q � } � ' 'r '� � ....0 _ _ _ ➢i C& W eoo .lb�S - u�nd ^ ` r> • ' +l..f '' '� .:t:`' ::� '" r ;t�' }ir? SS�a�►JlNOJ O W P W J.441 5 `..�f a. g >.. t '7 }' '� (/� r _ _ _ _ •. fie . - I Y L _ c _ w LLI LU w X rn w w EXHIBIT G +* r to '. i t z W I iii a ... Sr !Er td a a �0 LU •i"°Y; s A R � 1 i 4 4 LU / Y , i� a iI j t1" cc z Lul •� 71 Ir ,:y M .Y ;/" "'p+�.. �;.. ^; IQ J a is ��'. a r• { - 1. 4+►'a Q H i w co LLJ -cc N ti Y� { - 3 I �- ly CD x ,N add+ Y ,. �u J NW.'''W �.aiw� '{ J �' � �ii J - �\ .;; � '<f ' ;x -:[ .. II �� �• Z Q azS CD ,. iY/ % .I A`_ I ✓11'< 3 � Ili , `. �`• ` x'" � ��.1 1 A'� � , T a. 1 La; a `I CO + y l ` . t I+ i 4 �fi ■i ,F f .�.. O t... U Z J ac ' X - +�- 1 z d� LU . j j y, I j Z z ,,jjam� y4 �• � + � '1'i� J i1 7{r 3 uj O�rI • -'�• i y rll e+i o y y j QF �• a7 Q : uj bd W -- .. Ok:' �., - -:` � . �� � � - : EXHIBIT H � WWI FT 1181HX3 PAt I C 4 7 CANAL m IM Z M ?; 2 ��I 9 �}1 .P m m 3 w O o cn m z IM or- s. ` - •-s- . - _ - --�� - -ii �• , Q� �- 1. 1 „ ,tom, � .? - �..r� C OrsA R CSC 1 r 1�! .� ti" i• a rR Yi ° �„� 4 O 4 r Z --I SCALE., 1 1 P O A Z St 16, ?- f �y • ` �I. 11il t{ 7 :I,j I Y� '' � :'F ". !y��'.? CID �v �jq:T E R r FFJ 4A I rAlk N , 'I i I tom, On' rT � r- .'- 3 'i - a sl��_ F' a �1� �!'I��� � t� �4�� � � � tL � .�.• I 7 ,. tZ DR F� 4tl�z� •»+b 9 1� �� irn 111 Ca Ilk ' '+ : i I i � f r I •�j � •t �_ ,fit �,._ r � {, f. /j,�:, / a _:1 � ?fir} i,``p f - I � 1 �'•�. �t. i �ij{i ? .jr'* ��r / /,1�/ / u o j z m w < A��ltdlF ��. i d I, ( �, M y -' �+; ° ; •;` i, // i -�� t cn cn �" � •r. ,� � � s � is �� //. r I'... a Y� ,r., Id CC CL J . J s" � ilk At 4p j � �/ rao - ,' '7' •` � � :ry _ �iti � 1]-�..V,� _ ' .�ti. t II". Z, i iY `� t _ •�.. 3 r'y�� 7r. : -'t. F �i�•a o co n / /mot.il yt ;��. - ;Y' •�' ll �L „� I t' ' ►_I� �` 1'�4�.i?'�j -� z N }' V► 1 x rn ca wi L, �- - , M, r _ LAJI t � :� ' ,.; I �=- .•� ( '• {• +T'r -�A � �� F ` � - ti • .�+� F O �f -AP �uwj/ rf Q W"+.►".,. - 3�'��..,I fit, la '1 �i - x m _+ -► f— CN am G 3A� . uu r _ �. t1- n ✓ Y` S 4,+ _ IV LJLJ CM _ z3- I,�' e • ti..'! � N 'f I i i f # : '� : - ' � ''iW �tpllti,, cN'*k t i l 1 — I� GC W v I:Rpk L :3 I ) S CO LLj R711 7 1 '; 0 t jJ`' Q t y j i 4;.fi Clf zz Eui w 1�9 lew", A, W z w _j Nil ly t y t [ Ill I w p LU '! '. pw�z.�� w � pio 41 d., i. y 3 3 uel l 1 ao co V .� �- EXHIBIT J Congress Avenue Alignment Study Modifications January 2006 4.3 Establishment of Evaluation Parameters To provide a consistent framework for evaluating the alternative alignments, a set of evaluation parameters was developed in the following categories: Engineering, Environmental, Socio- Economic and Costs. The parameters used for this project are as follows: • Geometric Features & Safety • Constructability /Construction Costs • Estimated Total Costs • Railroad Crossing • Reconstruction A -lA • Environmental & Utility Impacts • Community and Relocation Impacts Every attempt was made to restrict the evaluation parameters to only those that were relatively independent, and to avoid measuring factors that were completely and directly dependent upon other characteristics or criteria already included in the list. There are obvious differences in the nature of the various parameters, some being purely quantitative (for example the construction cost) and others largely qualitative (for example the community impacts) that relied upon more subjective judgments. _The community impacts included: avoiding traffic volume impacts to neighboring subdivisions minimizing impacts to existing business, residences and mobile homes avoiding impacts to the parcel of land near the Seacoast Water Treatment Plant 4.4 Establishment of Parameter Relative Weights Each - parameter was assigned a value ranging from 1 to 9 depending on its degree of importance. -- . - - These parameter weightings were developed from the average of individual weighting sets prepared by members of the design team that reflects a broad range of professional backgrounds. Exhibit K, Matrix Weighting shows the results of the weighting alignment analysis. 30 EXHIBIT K, MATRIX WEIGHTING EVALUATION PARAMETERS RELATIVE WEIGHT PARAMETER RANKING Geometric Features & Safety 8.75 1 Constructability & Construction Costs 7.50 2 Estimated Total Costs 7.00 3 Railroad Crossing 4.50 7 Reconstruction A -1 -A 5.75 5 Environmental & Utility Impacts 5.25 6 Community Impacts 6.75 4 .OVERALL RATING 45.50 Congress Avenue EXHIBIT NO. from Northlake Blvd. to Alt. A I A K County Project No. 92606 - MATRIX WEIGHTING PAGE No. 31 ENGLISH\ PROJECTS \Congress_21107U]ignment Study 2005 \EX L Matrix Weighting 010506.doe (D O N N N (0 r i Q O Q O w in Z ? U O m �: _ U : 3 LL O =O Z' m W Z 7 3 m > t Q 2 R I U) Q W LL O m O O U o iC E .N W O U C a` m N a O O X o O � °m m en O o o m C m � � N o o v_. Cn n (D N to O U) V N R 0 0 m W h M 00 N p i W N m v ° T o `o u 0 E U m v 0 y w � c O1 C 0 0 o c O a p R m m 0 c n 0 0 0 N j � m m C O m c O z N O O O a O F0- N E � N m H W N O O M O O O m o °o r o E _c o M Cl) a v E v p 'O M '1p U N L G C a IL O w (fif CiT 6% o b% m 3 = W W O O` N N N n m _ c v O m 0 00 C to U 0 c m 0 °o 0 0 O a v m o 0 a o Gr 0 a 00 q 0 ry OGI 0 N r C c E N N O_ N CO 0 O 0 N 'I r m mN CD U)m J 0 p 2 0 LO V m m m _> 2 U E E (n O) M co W O O ♦" V1 m m> .� �j 3 m O lO L o N e R C IO N m (A m (F? (D U9. V O) O N 1� t iU C O R m O 0 y U 0 N U) V CD U) O m (n m M V« mOE 1n (O m c M U)CDmmm O (n Di 0 0 a 0 N Cl! N N N U Q J v (9 v v c v v v 69 ER E9 ER (fi L m (n m mmn(D V CD V 7 a J m > m 00000 O 0 L rn v r CO N (D r tR N DI j LL 00 0 0 0 Q K 0 6 L D U Q° v m LL 0 w O m V N V IL J N N N N N 0 m cli LO m N m i ri Gi O (D . m(DrmV O N Q N t N M co r U Cn 2 d' CO m V N m G K m IT o o to (D n (o U) IT (O V N m U) m (O N N N N N w # m L L L L 0 O 0 0 L 0 (Fr U» eci Z (n K Z (O m E M a ¢ m (D m C N N N N N V m 00 00 rn 0 0 00 (6 0 00 Q O Q Q m m m 0 T a O O X o O � °m m en O o o m E m � � N o o v_. Cn n o rn Y � V N R 0 0 p R p o a £ O p h M 00 N p m N C L N m v ° T o `o u 0 E U m v 0 y w � 0 0 0 o c O a p R H ~ m 0 c n 0 0 0 O m C O m c O z N O O O a O F0- N E � = m 0 0 ( O O O O o °o r o E _c o M Cl) Cl) p 'O M '1p U N L G C a IL O w (fif CiT 6% o b% m O O 0 `oF O O` - a L c p n m _ c v m m m E E 0 00 C to U 0 c m 0 °o 0 0 O a v m o 0 a o 000 a 00 q 0 ry OGI r C c E N 00 0 O O m R c R m m m N V V a J 0 0 0 0 0 m C a C O m _> 2 U E E O O M O O ♦" V1 m m> .� �j 3 m O lO L o N e R C IO N m (A m (F? (D U9. O) ffT 0 o v m m Q a c t iU C O R m O N L U 0 Q U F- R 0 0 M V« mOE 1n (O m m rn.N. O 6 0 0 O 0 0 U Q J 0 (9 vy N (A v M of _ m > m O O 0 N DI W O c: 0 6 Q D U Q° V (1) M 0I0 W (a W� N N m V ED O (D O N m 1n { U Cn o d' m O m Q V c 1- 4) (O V N m U) m (O w m m M 00 W (rr (R (Fr U» (» m O M U) N N O U 00 U) Cl) to 00 N V m 00 00 't; (6 0 00 (% Congress Avenue Alignment Study Modifications January 2006 4.5 Generation of Ratings Based on professional experience and study of the project area, each alternative was analyzed with respect to each of the parameters and Exhibit M, Narrative Matrix, was developed. This table provides a brief description of the benefits or detriments of each alternative with respect to each of the parameters. From this narrative evaluation one of the following ratings was assigned: -- very negative effect (multiplier of 0.6) negative _effect (multiplier of 0.8) 0 neutral (multiplier of 1.0) + positive effect (multiplier of 1.2) ++ very positive effect (multiplier of 1.4) 33 EXHIBIT "M" NARRATIVE MATRIX Parameters Geometric Features & Safety Constructability & Construction Costs Estimated Total Cost Railroad Crossing Reconstruction, A -I -A Environmental & Community & Relocation Alternative Utility Impacts Impacts Alignment Broken back curves separated by +/- No construction issues are anticipated. Modify existing Only minor intersection Traverses only developed upland areas containing a mobile home Impacts 16 mobile homes, 2 IA & 2A 850 8.546' radius, which will Standard construction cost expected. crossing to address wo& community and the Seacoast Water Treatment Plant. Impacts the residences and 2 businesses North require a reverse crown $5,564,008 road widening existing water treatment plant well field area. Some underground and 6 parking spaces. superelevation rate per 35 mph p design criteria. Estimated construction cost $1986,589 , and overhead utility relocation required along Richard Rd. 1 Alignment runs between wells No. 1 & 2. + + + 0 0 + Alignment Broken back curves separated by +/- No construction issues are anticipated. Modify existing Only minor intersection Traverses only developed upland areas containing a mobile home Impacts 16 mobile homes, 2 IA & 2A 850 & 546' radius which will require Standard construction cost expected. crossing to address work community and the Seacoast Water Treatment Plant. Impacts the residential buildings and 3 South a reverse crown superelavation rate- $5,096,453 road widening existing water treatment plant well field area. Some underground parking spaces. per 35 mph design criteria Estimated construction cost $1,989,530 and overhead utility relocation required. Alignment runs between wells No. 1 & 2. + ++ 0 ++ Alignment Reverse curves of 660' R & 1200 R No construction issues are anticipated. Modify existing Only minor intersection Traverses developed areas. Minimizes impacts to the existing Impacts 24 mobile homes, 2 1B & 2B with a roundabout as the alignment Standard construction cost expected. crossing to address work. water treatment plant well field area. Some underground and residential buildings and 5 (Roundabouts) turn east toward SR AIA. Design Construction cost may be affected by road road widening overhead utility relocation required Park Lane and Richard Road. parking spaces. speed 35 mph with a N.C. addition of access to mobile homes. superelevation rate. Roundabout design may not be appropriate for N.B. movement. Does not allow access to mobile homes north of Estimated construction cost $2,031,283 Avocado Lane. 0 -- 0 + -- Alignment Triple reverse curves with May require significant regarding at the Modify existing Only minor intersection Traverses developed areas. Avoids impacts to the existing water Impacts 27 mobile homes, 3 iB & 2B superelevation requirements. railroad crossing to address crossing to address work. treatment plant. Some underground and overhead utility businesses and 2 residential North Superelevation transition length may superelevation transition. superelevation relocation required along Park Lane and Richard Road. buildings. encroach into adjacent curves. 35 Construction cost maybe affected by transition and road mph design speed. Does not allow addition of access to mobile homes: widening. access to mobile homes north of $8,618,595 Avocado Lane. Estimated construction cost $2,002,945 0 -- -- I 2 B f�di Triple reverse curves with May require significant regarding at the Modify existing Only minor intersection Traverses developed areas. Avoids impacts to the existing water Impacts 23 mobile homes, 2 South superelevation requirements. railroad crossing to address crossing to address work. treatment plant. Some underground and overhead utility residential buildings and 5 Superelevation transition length may superelevation transition. $5,372058 superelevation relocation required along Park Lane and Richard Road parking spaces. require encroaching into adjacent Construction cost may be affected by transition and road curves. 35 mph design speed. Does addition of access to mobile homes widening. not allow access to mobile homes north of Avocado Lane. Estimated construction cost $1,975,882 _ 0 Congress Avenue FIGURE NO. from Northlake Blvd. to Alt. A I A j� /� �(� n T NARRATIVE 1V1L`�T�LX M County Project No. 92606 PAGE NO. 34 12/29/05 Congress_ Avenue Alignment Study Modifications January 2006 4.6 Ranking Each Alternative As previously stated, this evaluation involves a combination of both qualitative and quantitative values resulting in an overall score as presented in Exhibit N, Evaluation Matrix. This table also shows the following: • seven evaluation parameters • relative weight of each parameter • rating (from - - to + +) for each alternative for each parameter • score for each alternative for each parameter (results of multiplying the numerical rating times the relative weight for that parameter) • total score for each alternative (sum of the parameter scores for that alternative) • rank (from highest scoring alternative to lowest) 35 o ° o ° o O �r Co � kn - to `D 0 4 N [� �O 06 M 41 m �O m Q M `Z ai Oo O OO O N Oo O IC! O Z W Q w a W) z o o N o a- � l� �6 v M 4l C4 W ¢&d a, Oo OO Oo o 0 0 0 0 0 0 a F y W O v tn � It r ° Oo 00 O N O �o Oo r O .- - O C5 � O O O O "t O d: tn r-: O N kn ,I: C> kn 7- ,J, Q C14 Q� vl d• ON „y O OQ N N N O Oo �� z O O O v7 N O O O l� I- d h [\ v'1 N Vl r DD W) N b0 N d'd Q Q N N O N O O N l •'1 V v W v *-' N M V•1 (� a H � o � Ln O kn kr) � W) N p 4a � O Oo O 1D �O 0O O O CO cad cn V +�+ Q{',�..,• 00 vi CA a�.0 U U o o o���o Pk Cd �' Cd 4 W ro o W ?0 II 11 =o + fTr O W W O U w C7 o U Congress Avenue Alignment Study _ January 2006 5 RECOMMENDATIONS From the Evaluation Matrix, Alignment 1 and 2A (South) scored higher than the other alternatives under consideration. The geometric features of this alignment were ranked the second best, the total cost is the lowest, the railroad crossing remains at to the present location, and community and _relocation impacts are the lowest. It is recommended that Alignment IA and 2A (South) (Exhibit G) be adopted. The following is a list of agencies with an interest in the project: South Florida Water Management District, Village of North Palm Beach, City of Palm Beach Gardens, Florida Department of Environmental Resource Management, FEC Railroad and Army Corps of Engineers. It is important to keep these agencies informed of the proj ect progress and also, close coordination with the adjacent businesses, property owners, and the Seacoast Water Treatment Plant and other utility companies is recommended. Exhibits O and P represent a possible first phase of the recommended alignment. This option would construct only that portion of the project within the limits of the proposed Hilltop Gardens development and any additional improvements needed to connect to the existing roadways. This option would minimize community and business impacts at this time. Exhibit Q is a preliminary sketch of Alternate A -1 -A Intersection with the recommended alternative. 37 .. COAST =r S R A TR Alr �� LAN""r r. a A T L 19 *' i� ;t r•. � it a �� ENT y » +.1 Tm A. WELL, #2 `PARK, ,ENTRANCE AmLll ~� CITY OF •1 j ', - i �. PA M BE AC GARj)ENS 0 D JD R _ Y / s r (q Vol 1: y X PROPOSED R/ W LINE EXIST, R/ W LINE EASEMENT LINE 0 C'ull Rj ........... ;£ CONGRESS AVE,- NORTHLAKE BLVD, TO ALTERNATE A-1-A CORRIDOR MAP -ALIGNMENT 1A PARK LANE, INTERSECTION (ALT. 1) 110' RIGHT OF WAY Q i pk�W r ♦i = � I f PROPERTY IMPACTS- = WATER PLANT WELL - .. ti 0 S E.A C O (A T E FR** w p', Jt x T THE I P:L - •' t �t�_ O' .i'ty:`!u *r�`.. h t� -_'' fi ;� ,t..�' 0 t F L O R 1 Y-7 r T tx � 14*t LUI co NT J WELL #2 x 11, 1 J... �. V a � -..� � .- /' - � '!' ( M i • 1'. �\ '►mss_ r ,x4, i / i % r• 4 CITY. I i - +� 1 _ PALM BEACH GARJ)ENS PRO!?. ARK I 7 y r 4 ff N T CE I , R fl ENS r/ a i Vp WEL1,f i A DO LA , t 6.. TX PROPOSED R/W LINE CONGRESS AVE,- NORTHIAKE BLVD, TO ALTERNATE 1-1-A PROPERTY IMPACTS: I s CORRIDOR MAP - ALIGNMENT 1A � EXIST. R/ W LINE -WATER PLANT WELL ° ' EASEMENT LINE PARK LANE, INTERSECTION (ALT, 2) 110' RIGHT OF WAY V� V x 00 y ��F � • I R-F Wtqmi-wT-- - - Ay � k � W >, LoR19�' s JL... S 20' ■ EASE = T ENT ' SEACOAST E' .tea -RE T E CANT f° € \ — \ \ \V \\ r ." " .F r a w .:• _ ` r 1:= ..p1F ', i4' woo s f ( I \\ \ \ ELL 1 #2 : =>; � � ,� m �. �:_ • , . W Y c N !r- •_s ■ r IF PROPERTY IMPACTS: CONGRESS AVE ' O A L 1 ERNA TE A 1-A WATER PLANT WELL VACANT LAND MOBIL HOMES (OWNED) PARKING ALIGNMENT CORRIDOR MAP - ALIGNMENT 1A & ZA SOUTH CITY P.B.G. PROPOSED R/ W LINE � HOUSES EXIST. R/W LINE ALTERNATE AlA INTERSECTION PROPERTY EASEMENT LINE 80 RIGHT OF WAY - •fir �: Y r � I I f \ r I It t t #41,. ; Congress Avenue Alignment Study January 2006 ` APPENDIX A LOTSPEICH AND ASSOCITAES,INC. PRELIMINARY ECOLOGICAL ASSESSMENT REPORT 41 Lotspe ch and A:ssodate ECOLOGICAL CONSULTANTS �� ����� PRELIMINARY ECOLOGICAL ASSESSMENT REPORT v411i V �'liJlvli r �L G j E',C� .. Torthla'e blvd. to Alt. A1A 0.75-L. mule in Sections 17 and 18, Township 42 South, Range 43 East Palm D:.ach County, Florida Prepared for: Metric Engineering, Inc. 6415 Lake Worth Road, Suite 305 Lake Worthy Florida 33463 22 November 1999 L &A No. 9333.41 - Doc: ITMHD19333K22.RPT 422 West Fairbanks Avenue, Suite 201, Winter Park, Florida 32789 (407)740 -8482 FAX Idrrn adr -, -inz Preliminary Ecological Assessment Report Congress Avenue Extension L.&A No.9333.41 Doc:MIHD\9333K22.RPT 22 November 1999 Page i TABLE OF CONTENTS Page INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 METHODOLOGY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 EXISTING SITE CONDITIONS 2 Topography and Drainage 2 Soils 2 Vegetative Communities 2 - -AGENCY-JURUTSDICTIO - - 3 - LISTED PLANT AND A\TTNIAL SPECIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-,IITIGATION CONCLUSIONSIRECO:ti1MENDATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 FIGURES Figure 1. Project Location Map Figure 2. Vegetation and Land Use Map PRELIM NARY.ECOLOGICAL ASSESSIVINT REPORT Congress Avenue Extension Northlake Blvd. to Alt. AlA Palm Beach County, Elorida Doc:UNfHD\9333K19.RPT E'TRODUCTION Lotspeich and Associates, Inc. (L&A), as the ecological consultant_to Metric Engineer'tngInc. - - - - -- - 4 Me[rrc1-co.-c�uaetdli E-colooicai assessment of the natural communities within the four alternative alignments (1, 3, 5 and b) of tine proposed Congress Avenue Extension(from Northlake Blvd. to 10`h Street),project area-a 0.75± mile corridor located in Sections 17 and 18,Township 42 South,Range 43 Palm Beach County, Florida (Figure 1). The purpose of our assessment was to document the presence of ecological conditions occurring on-site that may pose constraints to the proposed developm°nt of the property. The scope of this investigation was limited to bio'ogical elements such as jurisdictional wetlands, and Federal or State list-2d plant and animal species. This report serves to document the findings from our investigation. No subsurface soil, water quality, or hazardous materials investigations were conducted by L&A. These findings reflect conditions on-site at the time of the investigation and do not preclude the possibility that on-site conditions may change in ti-ie future. METHODOLOGY The project area was iinvestigated through review of published information, a review of State database Species' occurrence records, and field reviews to ground truth on-site vegetative commurties. Based -on the corridor maps provided by Metric, dais Preliminary Ecological Assessment focuses primarily on`Alternative Alignments 3 and 5, as alternative Alignments 1 and 6 traverse only developed upland areas containing a mobile home community. and the Seacoast Water Treatment Plant.- Alternative Alignments 3 and 5 traverse these same developed areas then extend through a naturally vegetated upland approximately 9 acres in size. With the exception of a apparently upland-cut ditch along the west side of the-CSX railroad near the end of the proposed extension, the four alternative alignments were not found to traverse any areas of jurisdictional wetland, as defined by die Corps of Engineers Wetlands Delineation Manual (1987) and the Unified Wetland Delineation Methodology for the State of Florida dated 1 July 199''. The vegetative communities and land use areas that were identified are presented on the attached Vegetation and Land Use ivlap. The site was also reviewed for the presence of any resident listed plant and/or animal species through actual observation, signs of scat, prints, or other indications of their presence or utilization. These conclusions are based on limited field observations and existing data records and do not exclude the possibility that other listed species may occasionally forage on-site or may move onto the site at a later date. General observations and vegetative community types were recorded via field data sheets and photographs. 1 Preliminary Ecological Assessment Report Congress Avenue Extension L&A No. 9333.41 Doc:U1YEID%9333K22.RPT 22 November 1999 Page 2 EYIS=G SITE CONDITIONS This project area lies within a triangular area that is bounded by Northlake Blvd. on the south, the C-17 Canal on the nor-thwest, and by Alt. AIA (10''Street) on the cast. The rnajority of the project area lies within a large mobile home development. The project area also con airs the Seacoast Water Treatment Plant, two areas with fixed single family residences, and tite north end remains naturally vegetated by sand pine scrub and upland hardwood forest. Topography and Drainage The project area is relatively level on the east side, gradually sloping down to the west. The United States Geological Survey (USGS) map for corridor area depict:, the elevation as increasing from approximately 10 feet National Geodetic Vertical Datum (NGVD) on the west side to approximately 25 feet NGVD on the east side. Natural sheetflow appears to be tie primary drainage feature, with surface water drainilg west and north to the C-17 Canal. A small ditch occurs along the west side of the CSX ra"'road but is separated from the main project area by the nor­ i end of Old Dixie Hwy. Soils Soils within and adjacent to the project area, as mapped by the Natural Resources Conservation Service (NRCS) in the Soils Survey of Palm Beach Colony, Florida are described as: Arents-Urban Land Cornplex - (Au) St. Lucie-Urban Land Complex -(SuB) Both soil types are classified as excessively drained soils that are nearly level to sloping. Neither are characterized as hydric soils according to the Corps of Engineers Wetlands Delineation Manual dated January 1987. Neither are soil types typically identified with areas that are determined to be wetlands that are jurisdictional to the South Florida Water Management District (SFWYID). Due to the effects of adjacent development and the drainage effects associated with the C-17 Canal, the soils may have been modified by grading or reshaping. Vegetative Communities -This portion of the Congress Avenue Extension project area consists of several human land uses and two remnant upland plant communities (Figure 2). The identified vegetative communities and land uses are described using the Florida Land Use, Cover and Forms Classification System (FLUCFCS), Level III. A total of seven vegetative communities and land uses were identified for the project area. These are: Medium Density Fixed Single Family Units(121), High Density Mobile Home Units (132), Mixed Commercial and Services (147), Light Industrial (155), Sand Pin° (413), Upland Hardwood Forest(420), and Water Plant(833). A list of plant species encountered was recorded for the naturally vegetated portion of the project area. This list reflects the representative species and is not necessarily a complete floristic inventory. Field data and complete plant lists are retained in the files of L&.A and are available for review upon written request. The identified vegetative communities and land uses are detailed as follows: Preliminary Ecological Assessment Report _Congress Avenue Extension L&A No. 9333,41 Doc; VMHD19333K22.RPT 22 November 1999 Page 3 Medium Density Fixed Single Family Units (121) - A few single family residences occur northwest of the forested areas in the northern third of the project area as well as south of Richard Road, just east of the mobile home community. Alignment 5 may impact a portion of one home site north of the -forested area. -Alignments 1 and 5 would impact dwellings south of Richard Road. Higa Density itilobile Home Units (132) - This land use composes th- majority of the project area south and east of the Seacoast Water Treatment Plant, with each of the four alternative alignments traversing in the range of X10 to 50 of these home sites. 1Ii.Yed Commercial and Services (1d7) - A variety of corrsnercial and service oriented business--s occur along Northlake Boulevard across southern edge of project area. Other Light industrial (15) - A light industrial /storage structure is loca;cd on the north side of 1 '�ichardRoad- J_rnmediatelye-ast of the seacoast iVater treatment Plant. - - - - -- -- - - - _- — - -� - - - - - -- - --- - - Upland Hardwood Forest (4?0) -This 9.2-4 acre forested area is located in the northeast portion of the project area. This community includes a canopy of live oak (Quercus virgiriana), laurel oak (Q. laurifolia), red bay (Persea borbonia), mango (Mangifera indica), Australian pine (Casuarina sp.), cabbage palm (Sabal palmetto), and strangler fig (Ficus aurea). Shrubs and ground cover species include sea grape (Coccoloba uvifera), buckthorn (Siderorylon tenax), Spanish bayonet (Yucca aloifolia), Surinam cherry (Eugenia uniflora), wild coffee (Psyrhotria nervosa), Brazilian pepper (Schinus terebinthefolius), bowstring hemp (Sansevieria hyacinthoides), fish -tail fern (Nephrolepis falcata), and wedelia ffedelia trilobata). Portions of this community are subtended by yellow sa-d and gopher tortoises were observed within the edge of this community. A specific gopher tortoise survey would need to be conducted tivithin this area if impacts are expected. Sand Pine (413) - A 3.75 acre sand pine scrub community occurs in the southwestern part of the naturally vegetated area at the north end of the project area. The canopy consists of sand pine (Pinus clausa) with occasional cabbage palm and earleaf acacia (Acacia auriculiformis), Shrub and -herbaceous species include buckthorn (Sideroxylon terax), Feay'' palafox (Palafoxia feayi), sand spikemoss (Selaginella drenicola), blue -eyed grass (Sisyrinchium sp.), and jointweed (Polygonella polygama). This community is also subtended by yellow sand. While no gopher tortoise were observed during the preliminary assessment of this community, it would provide suitable tortoise habitat and should be surveyed if impacts are expected. 'Water Treatment Plant (833) - Seacoast Water Treatment Plant (68.27 _ acres). AGEI CY RMSDICTION The USACE, the SI WMD, and Palm Beach County (County) have regulatory jurisdiction over the proposed corridor. No jurisdictional wetland areas were found to occur. 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'...... =--,,, i 8•.. \:. ;- j a L.otspeicharxlAssociates, Ync. Conti essAvenue Extension Project ECOLOGICAL CONSULTANTS Northlake Blvd. to Alt. AIA Vicirut}' \dap 422 West Fribarks Airtwe, Sutr 201, Willer PA FL 32233 (407) 740•A4t2 Fu 645• - 0.95 +J• mi;a Sacs 17 avid 15, 1'..� .?�, F.;a Sac , 170i �mal:letspeich�sol.wfa 'Pa'nSaaeh Coi:r.;�. Ftcrca Leval 121 132 147 155 Fix=---: P I - Lig:�-. 0-mi6 cot k-n basal V Forla Lond Um, Cover crc Forms C!.7szi.rc5or Sr,!efn. FOOT, 1999 Fr�;,�j bctcdce-i. cz -_�C­-. bo*cd on wormclicn- 413 pe�-. by U-!,'c 420 Up:: 833 Wo-:--- pum. pinn , r:, 5"c"Ons) Lolsp...[ h and nc d Asso\6q,.[\-s) ,rn ECOLOGICAL CONSULTANTS Coquess Avenul- Ext�nsion Proj-ct NoftHaik -e Blvd, to AR. A I A Vecr ctafin and Land Use, b + 0 7S TI 3. A 6 0 m s 9 N I H I A H M V, EINIH33NIEIN3 luo; 1 )-2 ux) . platu p . iOJ2 1 u I ljpqSl Xua Z:LT9-996--t9S oS;S;9-996-T9 !g COM rIA 'qIJOAk WIL"ll COE alms PRO-d qPOAk alul STV9 a;)Ujo tulud Isam