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Home My WebLink AboutDocumentation_Planning and Zoning_Tab 2_12/20/2018 (4)Pelican Square Section 30, Township 405, Range 43E Village of Tequesta, Florida Preliminary Water Management Calculations Prepared: April 2018 Revised May 2018 Amy N Galvez 13:23:21 2018.08.21 . `y N• GAtV��;�,, 3r i No• 55386 i. SS .ORIDA..'Com: This item has been electronically signed and sealed by Amy N. Galvez using a Digital Signature and date. Printed copies of this document are not considered signed and sealed and the signature must be verified on any electronic copies. Simmons & White, Inc. 2581 Metrocentre Boulevard West Suite 3 West Palm Beach, Florida 33407 Cert. Of Authorization 3452 Proiect Summary: The subject parcel is located between Canal Court and Inlet Court, west of US -1 in the Village of Tequesta, Florida and contains approximately 1.05 acres. The current addresses are 691 and 19626 N. US. Highway 1, 3471 Inlet Court and 3486 Canal Court, and the Property Control Numbers for the subject parcel are 60-43-40-30-58-001-0000 60-43-40-30-58-002-0000 60-43-40-30-58-003-0000 60-43-40-30-58-004-0000 The site is currently vacant with an alley that will be vacated. Proposed site development consists of the construction of office space with apartments above and one townhouse building. Proposed Land Use: There is a significant grade differential existing on the site and a retaining wall be required along the east property line for the proposed development. The FFE for the buildings on the west half of the property will have a three to four foot difference with the building on the east half of the property. Building / roof area = 0.24 acres Parking / Impervious areas = 0.40 acres Open space area = 0.41 acres Total area = 1.05 acres Water Quality: 1) 1" Over the site: 1.05ac (I") = 1.05 ac -in Required Water Quality 2)21/2" x % Impervious: (1.05 ac — 0.24 ac — 0.41 ac) x 21/2" x 1.05 ac (1.05 ac — 0.24 ac) =1.3 ac -in Required Water Quality 10.7 ac -in Provided in Trench Ground Storage: The soil storage value used is based on the SFWMD maximum allowable soil storage value of 14.68" since the site is located on the coastal dune and the proposed grades are mostly greater than ten feet above the control elevation for the area. Per the attached geotechnical report information, the soil type is St. Lucie, Paola, Urban land complex (Map Unit ID 41) and the USDA Soil Survey describes this soil type as consisting of sandy marine deposits located on knolls on marine terraces, with excessively drained sands noted to be present to depths in excess of 80 inches below grade, and with a water table deeper than 80 inches. Also, the soil borings indicate that the water table elevation is greater than 10 feet below existing grade. S = (0.41 ac) x (14.68" } 1.05 ac S = 5.73" Site Runoff Calculations: The project's location on the Coastal Dune presents the opportunity for the project to meet (and exceed) local governing agency requirements through the use of on-site exfiltration trench. This project is designed as a zero discharge site for up to and including the 100 year 3 day storm event, which is stored completely within the exfiltration trench. P = 16" Total rainfall for 100 year, 3 day event S = 5.73" Ground storage on site Calculate total runoff from 100 year, 3 day event: Q=(P-0.2S)Z (P + 0.85) Q = 10.7 ac -in Volume required to be stored in on-site exfiltration trench. 10.7 ac -in Provided in Exfiltration Trench Exfiltration trench recovery time: The calculations below are to show the recovery rate for the exfiltration trench based on the volume for the 100 year, 3 day storm event. Calculations are based on flow through 170 feet of 5 foot x 10 foot exfiltration trench with top elevation = 10.5 and (k) = 4.9 x 10'. Refer to enclosed exfiltration trench calculations for other dimensions: QBottom = (k)(142)(10 ft)(170 ft) Qsottom = 5.8 cfs Qsia. = (k)(170 ft)( H2 x Du — 0.5 x Du2 + H2 x Ds) Qsiaes =1.9 cfs Total Flow through Trench = QBottom + 2 x QSides = 9.6 cfs Volume required to be stored in trench: 10.7 Ac -in x 43.560 sf x 1 ft = 38,841 ft' Ac 12 in Time for recovery of exfiltration trench: 38,841 ft' 9.6 fl /sec x 3600 sec/hr =1.1 hrs SIMMONS & WHITE INC. METROCENTRE BLVD. WEST, SUITE 3 WEST PALM BEACH, FLORIDA 33407 CERTIFICATE OF AUTHORIZATION #3452 EXFILTRATION TRENCH LENGTH CALCULATION L= V K(H2 W + 2 H2 Du - Du +2 H2 DS) + (1.39 X 10-4) W DU V= VOLUME TO BE TREATED W= WIDTH OF TRENCH K= HYDRAULIC CONDUCTIVITY H2= DEPTH TO WATER TABLE FROM CONTROL ELEVATION DU= NON -SATURATED TRENCH DEPTH DS= SATURATED TRENCH DEPTH L= REQUIRED TRENCH LENGTH 12.5 10.5 7 5.5 y 2.5 JOB NO: 17-137 DATE: 4/18/2018 10.7 AC -IN 10 FT 0.00049 CFS/SF-FT 7.0 FT 5.0 FT 0.0 FT 169.04 FT CONTROL ELEVATION TOP OF TRENCH PIPE INVERT BOTTOM OF TRENCH WATER TABLE 2018 AERIAL PHOTOGRAPH USGS TOPOGRAPHIC MAP (1983 USGS Quadrangle Map of "Jupiter, Rorlda") xeilwnp� y = .�� . �: COUNTY LliE RD {..j;�-. SITE ^1'1 `I\ 41 - 'S. : �" Y fF`t� �S'�! � jives"-•^ ,yb� \� ;�`� "�', t', �',', , ) M • s JF�Y �Y BEACH RD �Iti )� 1 10 1, '`l� a Yl\ ! i�ch0alon• ...within Section 30 Township 40 South Z Range 43 East O S NOT TO SCALE ® ANDERSEN ANDRE CONSULTING ENGINEERS, INC. 834 SWSNan Avenue, PonSL Luck, n_ 39999 772-M-8191 vmvAACEIW=. CePo9eria of Authcrbetbn Na 28794 USDA SOIL SURVEY MAP APPROXIMATE PROPERTY BOUNDARY moo, 1 / i� H 1 . 0000 001, lWri 1 E- � J USDA SOIL TYPES ON SUBJECT SITE (Source: USDA Web Soil Survey) 41: St. Lucie -Paola -Urban land complex, 0 to 8 percent slopes PROPOSED 3 -STORY MIXE04JSE BUILOPM Ch -id by. DPA IMS: AupuH 2017 SITE VICINITY MAPS 1 -ACRE (N-1 VACAM PROPERTY NORTHEAST CORNER OF US WNY ONE a WET COURT AACE FSa No: 17.200 Figure No.1 TEOUESTA. PALM BEACH COUNTY. FL ir Soil Map—Palm Beach County Area, Florida Map Unit Legend 1 -Acre (+/-) Mixed -Use Site, Tequesta Palm Beach County Area, Florida (FL611) Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 41 St. Lucie -Paola -Urban land 3.2 100.0°h l complex, 0 to 8 percent slopes To for Area of Interest 3.2 100.00/0 usDA Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 8/25/2017 Page 3 of 3 Map Unit Description: St. Lucie -Paola -Urban land complex, 0 to 8 percent slopes—Palm Beach County Area, Florida Palm Beach County Area, Florida 41—St. Lucie -Paola -Urban land complex, 0 to 8 percent slopes Map Unit Setting National map unit symbol. 1j7ds Elevation: 10 to 20 feet Mean annual precipitation: 48 to 56 inches Mean annual air temperature: 70 to 77 degrees F Frost -free period: 358 to 365 days Farmland classification: Not prime farmland Map Unit Composition St lucie and similar soils: 35 percent Paola and similar soils: 33 percent Urban land: 30 percent Minor components: 2 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of St. Lucie Setting Landform: Knolls on marine terraces, ridges on marine terraces Landform position (three-dimensional): Side slope, interfluve Down-slope shape: Convex Across -slope shape: Linear Parent material. Eolian or sandy marine deposits Typical profile A - 0 to 5 inches: sand C - 5 to 80 inches: sand Properties and qualities Slope: 0 to 8 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Excessively drained Runoff class: Negligible Capacity of the most limiting layer to transmit water (Kset): Very high (19.98 to 39.96 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Salinity, maximum in profile: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Sodium adsorption ratio, maximum in profile: 4.0 Available waterstorage in profile: Very low (about 1.8 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7s 1 -Acre (+/-) Mixed -Use Site, Tequesta USDANatural Resources Web Soil Survey 6/25/2017 Conservation Service National Cooperative Soil Survey Page 1 of 3 Map Unit Description: St. Lucie -Paola -Urban land complex, 0 to 8 percent slopes ---Palm 1 -Acre (+/-) Mixed -Use Site, Beach County Area, Florida Tequesta Hydrologic Soil Group: A Other vegetative classification: Forage suitability group not assigned (G156AC999FL) Hydric soil rating: No Description of Paola Setting Landform: Knolls on marine terraces, ridges on marine terraces Landform position (three-dimensional): Interfluve, side slope Down-slope shape: Convex Across -slope shape: Linear Parent material: Sandy marine deposits Typical profile A - 0 to 3 inches: sand E - 3 to 20 inches: sand C - 20 to 80 inches: sand Properties and qualities Slope: 0 to 8 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Excessively drained Runoff class: Negligible Capacity of the most limiting layer to transmit water (Ksat): Very high (19.98 to 39.96 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Salinity, maximum in profile: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Sodium adsorption ratio, maximum in profile: 4.0 Available water storage in profile: Very low (about 1.8 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 6s Hydrologic Soil Group: A Other vegetative classification: Forage suitability group not assigned (G156AC999FL) Hydric soil rating: No Description of Urban Land Setting Landform: Marine terraces Landform position (three-dimensional): interfluve, talf Down-slope shape: Linear Across -slope shape: Linear Parent material. No parent material Interpretive groups Land capability classification (irrigated): None specified Iism Natural Resources Web Soil Survey 8/25/2017 Conservation Service National Cooperative Soil Survey Page 2 of 3 Map Unit Description: St. Lucie -Paola -Urban land complex, 0 to 8 percent slopes—Palm Beach County Area, Florida Other vegetative classification: Forage suitability group not assigned (G156AC999FL) Hydric soil rating: Unranked Minor Components Pomello Percent of map unit: 1 percent Landform: Knolls on marine terraces, ridges on marine terraces Landform position (three-dimensional): Interfluve Down-slope shape: Convex Across -slope shape: Linear Other vegetative classification: Forage suitability group not assigned (G156AC999FL) Hydric soil rating: No Palm beach Percent of map unit: 1 percent Landform: Dunes on marine terraces Landform position (three-dimensional): Interfluve Down-slope shape: Convex Across -slope shape: Linear Other vegetative classification: Forage suitability group not assigned (G156AC999FL) Hydric soil rating: No Data Source Information Soil Survey Area: Palm Beach County Area, Florida Survey Area Data: Version 12, Sep 14, 2016 1 -Acre (+/-) Mixed -Use Site, Tequesta � Natural Resources Web Soil Survey 8/25/2017 Conservation Service National Cooperative Soil Survey Page 3 of 3 NOTES AND LEGEND TB-# Standard Penetration Test Boring HAB . Hand Auger Boring EXE MSFWMD Eufiltration Test Shown and noted field work locations are approximate. All field work locations were located using the provided site plan, obtained aerial photographs, existing site features, and tape/wheel measurements. The shown field work locations should be considered accurate only to the degree Implied by the method of measurement used. Figure No. 2 Source: Conceptual Development Plan by Gentile Glas Holloway O'Mahoney & Associates, Inc. O APPROXIMATE LE 111.171; 1 -.NO' 0 10 .o W FEET 3slury 1 AF1, Fccr OF 1.. �, y �adr�J %7olO.tFb tt 1 A i , HAB-1 t ® t l i 3stnry t ��v.Lnmts ,Units t � L 3slury 1 AF1, Fccr OF 1.. �, y �adr�J %7olO.tFb tt 1 A i , HAB-1 t ® t l HAB-4j� � ��,•„ t ® ANDERSEN ANDRE CONSULTING ENGINEERS, INC. PROPOSED ENGINEED-U EXALUATION prawn Dy;PGA Data Aupust2o17 PROPOSEp35f-)VACTORY VACANT PERLLDINGS Cherkod by- Oeb:AU9=2017 ax swSwan Awmus, Port st Luek, PLE1993 na-eo7ala+ www.AAcpn�,w�n FIELD WORK LOCATION PLAN 1•ACRE (N-( VACANT PROPQiTY ry Cordtkata ofAuthorixction Ne.26794 �ETEOU�ESTA. PALM BEACH COUNTY, COUR7 AACE FIb No: 17-200 Figure No.' 3stnry ��v.Lnmts ,Units t � L 'f t HAB-4j� � ��,•„ t ® ANDERSEN ANDRE CONSULTING ENGINEERS, INC. PROPOSED ENGINEED-U EXALUATION prawn Dy;PGA Data Aupust2o17 PROPOSEp35f-)VACTORY VACANT PERLLDINGS Cherkod by- Oeb:AU9=2017 ax swSwan Awmus, Port st Luek, PLE1993 na-eo7ala+ www.AAcpn�,w�n FIELD WORK LOCATION PLAN 1•ACRE (N-( VACANT PROPQiTY ry Cordtkata ofAuthorixction Ne.26794 �ETEOU�ESTA. PALM BEACH COUNTY, COUR7 AACE FIb No: 17-200 Figure No.' I 10 HAB-1 DATE: 06/23/17 GRAY •FINE- SAND -(SP), T/0 CONCRETE t ROCK FRGM GRAY FINE SAND (SP) EOB O 7' BLS GWT N.E. HAB-2 DATE' 08/23/17 LT. BROWN. FINE. SAND. (SP), T/0 CONCRETE k ROCK FRGM GRAY FINE SAND (SP) ORANGE—BROWN FINE SAND (SP) EOB O 7' BLS GWT N.E. HAB-3 DATE, 06/23/17 ........ LT. BROWN FINE SAND (SP) GRAY FINE SAND (SP) .1 ORANGE—BROWN FINE SAND (SP) EOB O 7' BLS GWT N.E. HAS -4 DATE- 05/23/17 GRAY FINE SAND (SP) RANGE—BROWN FINE SAND (SP) EOB O 7' BLS GWT N.E. NOTE: A thin layer of topsoil (1"-2") Was observed on the site (not depicted on soil boring profiles) TEST SUMMARY (EX -1): 0 = 1.5x10-2 CFS d = 0.5 FT H2 = 5.0+ FT Ds = 0.0 FT K = 4.9x10 4 CFS/SQFT — FT HEAD We recommend using a Factor of Safety of 2 When using this value In the design of drainage Improvements. 0 5 HAB-5 DATE, 08/23/17 ....... LT. GRAY FINE SAND (SP) 0 W. SHELL FRGM GRAY FINE SAND (SP) .............. 5 EOB O 7' BLS GWT N.E. 10 EXFILTRATION TEST CONFIGURATION (Not To Sae.) �Q SFWMD EXFILTRATION TESTS K HYDRAULIC CONDUCTIVITY o STABILIZED FLOW RATE d DIAMETER OF TEST HOLE H2 HYDROSTATIC COLUMN 0S SATURATED HOLE DEPTH (BY OW» NOTE: IF 0, GWF NOT ENCOUNTERED K 40 nd(21= i,+-- *�VS+H=d) GRAPHICAL LEGEND: PROJECT NOTES: FINE SAND (SP) TB—/ STANDARD PENETRATION TEST [SPT] BORING (ASTM D1586) SP: UNIFIED SOIL CLASSIFICATION SYSTEM [USCS] HAB—F HAND AUGER BORING (ASTM D1452) USCS GROUPS DETERMINED 13Y VISUAL CLASSIFICATION EX—# SFWMD EXFILTRATION TEST EXCEPT FOR NOTED LABORATORY TESTS N SPT RESISTANCE IN BLOWS PER FOOT MC NATURAL MOISTURE CONTENT IN PERCENT (ASTM D2216) X.x:-.!r GROUNDWATER TABLE (FT. BELOW EXIST. GRADE) AT TIME DRILLED —200 PERCENT PASSING NO. 200 SIEVE SIZE [PERCENT FINES] (ASTM D1140) EOR END OF BORING GWT N.E. GROUNDWATER TABLE NOT ENCOUNTERED BLS BELOW LAND SURFACE ® GEOTECHNICAL RV 111 ERNO EVALUATION Dralen by: PGA Date: AVD,nt 2017 ANDERSEN ANDRE CONSULTING ENGINEERS, INC. SOIL BORING PROFILES AND PNCPOBEDJ�4TORYYp,EUi39EBULDINe8 Checeadby:DPA D.t.:AagaeL2o,7 e3eswSwanAvenue,Pon slLuau,FL3x863 775807-0mt .e..AncEh,�acm EXFILTRATIONTESTRESULT NORTHE"TCORNEERIINCRE ROFAis WYYOFIPROEaINLETCouRr Cenl6wle of AuthoTRetlon No. _ TEQUESTA. PALM BEACH COUNTY. FL AACE F'De No: 17$00 Sheet No. 2 EX -1 DATE 08/23/17 O.................. ..... .... ....... ......... ............... 1 TAN FINE SAND (SP) - W. SHELL FRGM _ m :... GRAY FINE SAND (SP) 5 v EDB • 6' GLS GWF N.E. TEST SUMMARY (EX -1): 0 = 1.5x10-2 CFS d = 0.5 FT H2 = 5.0+ FT Ds = 0.0 FT K = 4.9x10 4 CFS/SQFT — FT HEAD We recommend using a Factor of Safety of 2 When using this value In the design of drainage Improvements. 0 5 HAB-5 DATE, 08/23/17 ....... LT. GRAY FINE SAND (SP) 0 W. SHELL FRGM GRAY FINE SAND (SP) .............. 5 EOB O 7' BLS GWT N.E. 10 EXFILTRATION TEST CONFIGURATION (Not To Sae.) �Q SFWMD EXFILTRATION TESTS K HYDRAULIC CONDUCTIVITY o STABILIZED FLOW RATE d DIAMETER OF TEST HOLE H2 HYDROSTATIC COLUMN 0S SATURATED HOLE DEPTH (BY OW» NOTE: IF 0, GWF NOT ENCOUNTERED K 40 nd(21= i,+-- *�VS+H=d) GRAPHICAL LEGEND: PROJECT NOTES: FINE SAND (SP) TB—/ STANDARD PENETRATION TEST [SPT] BORING (ASTM D1586) SP: UNIFIED SOIL CLASSIFICATION SYSTEM [USCS] HAB—F HAND AUGER BORING (ASTM D1452) USCS GROUPS DETERMINED 13Y VISUAL CLASSIFICATION EX—# SFWMD EXFILTRATION TEST EXCEPT FOR NOTED LABORATORY TESTS N SPT RESISTANCE IN BLOWS PER FOOT MC NATURAL MOISTURE CONTENT IN PERCENT (ASTM D2216) X.x:-.!r GROUNDWATER TABLE (FT. BELOW EXIST. GRADE) AT TIME DRILLED —200 PERCENT PASSING NO. 200 SIEVE SIZE [PERCENT FINES] (ASTM D1140) EOR END OF BORING GWT N.E. GROUNDWATER TABLE NOT ENCOUNTERED BLS BELOW LAND SURFACE ® GEOTECHNICAL RV 111 ERNO EVALUATION Dralen by: PGA Date: AVD,nt 2017 ANDERSEN ANDRE CONSULTING ENGINEERS, INC. SOIL BORING PROFILES AND PNCPOBEDJ�4TORYYp,EUi39EBULDINe8 Checeadby:DPA D.t.:AagaeL2o,7 e3eswSwanAvenue,Pon slLuau,FL3x863 775807-0mt .e..AncEh,�acm EXFILTRATIONTESTRESULT NORTHE"TCORNEERIINCRE ROFAis WYYOFIPROEaINLETCouRr Cenl6wle of AuthoTRetlon No. _ TEQUESTA. PALM BEACH COUNTY. FL AACE F'De No: 17$00 Sheet No. 2