| 2012-12-26 11:39:03 | FROM: TRACY WARD, P.E. |
| | DATE: DECEMBER 21, 2012 |
| | RE: COSTCO WHOLESALE |
| | CC: EDWARD MCDONALD, P.E. ? BOHLER ENGINEERING |
| | CARLOS DEROJAS, P.E. ? SFWMD |
| | I REVIEWED DOCUMENTS I RECEIVED VIA EMAIL FROM EDWARD |
| | MCDONALD FOR THE SUBJECT DEVELOPMENT. THESE DOCUMENTS |
| | INCLUDED: |
| | |
| | 1. SUMMARY COVER LETTER |
| | THIS LETTER INDICATED THE DRAINAGE SYSTEM WAS MODELED |
| | WITH THE SOUTHERN BUILDING EXPANSION IN PLACE BUT THESE |
| | MODEL RESULTS WERE NOT SUBMITTED. |
| | |
| | 2. LETTER FROM FDEP INDICATING PROJECT IS COVERED BY |
| | THE GENERIC PERMIT FOR STORMWATER DISCHARGES FROM LARGE |
| | AND SMALL CONSTRUCTION ACTIVITIES (A.K.A. NPDES |
| | CONSTRUCTION GENERAL PERMIT [CGP]) |
| | |
| | 3. DRAWING SHEET C-5 EROSION CONTROL PLAN / SWPPP. |
| | THE CGP INCLUDES A SECTION ON WHAT INFORMATION SHOULD |
| | BE INCLUDED IN THE SWPPP IN ADDITION TO THE EROSION |
| | CONTROL PLAN. I COULD NOT LOCATE THIS OTHER |
| | INFORMATION. |
| | |
| | 4. REVISED CWPB STANDARD APPLICATION FOR DEVELOPMENT |
| | PERMIT |
| | THE LOT NUMBER FOR THE LEGAL DESCRIPTION WAS REVISED |
| | AND THE SECOND PAGE WAS INITIALED. |
| | 5. DRAINAGE CALCULATIONS (DATED DECEMBER 19, 2012) AND |
| | NODAL DIAGRAM |
| | THE 5-YEAR 1-DAY, 10-YEAR 1-DAY AND 25-YEAR 3-DAY |
| | DESIGN STORMS WERE MODELED USING ICPR (INTERCONNECTED |
| | CHANNEL AND POND ROUTING) FOR THE SITE WITH THE |
| | FOLLOWING ASSUMPTIONS: |
| | |
| | A. AREA NORTH OF EXISTING BUILDING IS UNDEVELOPED |
| | (PERVIOUS). THE BUILDING WILL BE EXPANDED INTO THIS |
| | AREA IN A FUTURE CONSTRUCTION PHASE; |
| | |
| | B. AREA SOUTH OF EXISTING BUILDING IS UNDEVELOPED |
| | (PERVIOUS). THIS PHASE OF THE PROJECT IS TO REPLACE THE |
| | SWALE CONVEYANCE IN THIS AREA WITH DRAINAGE PIPE AND |
| | CATCH BASINS TO ROUTE THE STORM WATER RUNOFF AROUND THE |
| | FUTURE BUILDING EXPANSION INTO THIS AREA. |
| | |
| | THE CITY?S LEVEL OF SERVICE CRITERIA FOR THE DRAINAGE |
| | SYSTEM PER CITY CODE IS THE 3-YEAR 1-HOUR STORM. |
| | ALTHOUGH THIS STORM WAS NOT MODELED, THE HIGHEST PEAK |
| | STAGE FROM THE 5-YEAR 1-DAY ICPR MODEL RESULTS IS 18.48 |
| | FEET NGVD, WHICH IS ACCEPTABLE. |
| | |
| | WHEN THE CONCEPTUAL PERMIT WAS ISSUED FOR THIS |
| | DEVELOPMENT, SFWMD USED THE 10-YEAR 1-DAY PEAK STAGE OF |
| | 18.69 FEET NGVD TO ESTABLISH THE MINIMUM PAVEMENT |
| | CENTERLINE GRADE. IT APPEARS THE GRATE ELEVATION OF THE |
| | DRAINAGE STRUCTURES WERE SET AT ELEVATION 18.70 FEET |
| | NGVD, IMPLYING TO ME THAT THERE WOULD BE NO PAVEMENT |
| | FLOODING FOR THE 10-YEAR 1-DAY STORM EVENT. THE RESULTS |
| | FROM THE MODEL RUN WITH ASSUMPTIONS A. AND B. ABOVE |
| | SHOW THE 10-YEAR 1-DAY PEAK STAGE EXCEEDING 18.70 FEET |
| | NGVD FOR FOUR (4) STRUCTURES, ALL PART OF THE DRAINAGE |
| | PIPE SYSTEM CURRENTLY BEING PERMITTED. THE HIGHEST |
| | 10-YEAR PEAK STAGE IS 18.85 FOR TWO OF THE STRUCTURES - |
| | THE STRUCTURE AT THE SOUTHWEST CORNER OF THE FUTURE |
| | SOUTHERN BUILDING EXPANSION (NODE C8-9) AND AT THE WEST |
| | SIDE OF THE EXISTING BUILDING (NODE C4). WHEN THE SOUTH |
| | AREA IS PAVED FOR THE FUTURE BUILDING EXPANSION, IT IS |
| | LIKELY THE 10-YEAR PEAK STAGE WILL BE EVEN HIGHER IF NO |
| | CHANGES ARE MADE TO THE DRAINAGE SYSTEM. |
| | |
| | 12/26/2012 |
| | PROVISOS: |
| | |
| | #1 MUST SUPPLY AND HAVE AVAILABLE SWPPP ON SITE AT ALL |
| | TIMES. |
| | HTTP://WPB.ORG/ENGINEERING/FORMS-AND-PUBLICATIONS/ |
| | REF: DEVELOPING A STORMWATER POLLUTION PREVENTION PLAN. |
| | |
| | #2 PROVIDE AS-BUILTS. |
| | |
| | #3 PROVIDE ENGINEER'S SITE CERTIFICATION. |
| | |
| | MANUEL JULIAN GONZALEZ |
| | ENGINEERING PROJECT COORDINATOR |
| | ENGINEERING SERVICES DEPARTMENT |
| | 401 CLEMATIS STREET, 4TH FLOOR |
| | WEST PALM BEACH, FL 33401 |
| | (MAILING ADDRESS: P.O. BOX 3366, ZIP 33402) |
| | MAIN PHONE: (561) 822-1200 |
| | DIRECT: (561) 494-1085 |
| | FAX: (561) 494-1116 |
| | MOBILE: (561) 644-7301 |
| | EMAIL: [email protected] |
| | WWW.WPB.ORG/ENGINEERING |
| | |
| | |
