Date: 11/14/2025 Time: 18:18 User: lvaldes Style Table: Langan.stb Layout: C-100 Document Code: 300375801-0503-GI004-0101

Collection: Research & Technical Reports
Sub-shelf: dpnr.vi.gov
Kind: Research Report
Island: St. Thomas
Date: 2025-11-14
Pages: 9
Text: Native Text

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Date: 11/14/2025 Time: 18:18 User: lvaldes Style Table: Langan.stb Layout: C-100 Document Code: 300375801-0503-GI004-0101 · · · · · · © Langan 2025 T:786.264.7200 www.langan.com WATERFRONT CENTER, SUITE A 72 KRONPRINDSENS GADE ST. THOMAS VI 00802 LICENSE NO: 1-61158-2B Langan Engineering and Environmental Services, LLC F:786.264.7201 Date: 11/14/2025 Time: 18:05 User: ahenderson Style Table: Langan.stb Layout: C-200 Document Code: 300375801-0503-CD101-0101 © Langan 2025 T:786.264.7200 www.langan.com WATERFRONT CENTER, SUITE A 72 KRONPRINDSENS GADE ST. THOMAS VI 00802 LICENSE NO: 1-61158-2B Langan Engineering and Environmental Services, LLC F:786.264.7201 Date: 11/14/2025 Time: 18:19 User: lvaldes Style Table: Langan.stb Layout: C-300 Document Code: 300375801-0503-CS101-0104 © Langan 2025 T:786.264.7200 www.langan.com WATERFRONT CENTER, SUITE A 72 KRONPRINDSENS GADE ST. THOMAS VI 00802 LICENSE NO: 1-61158-2B Langan Engineering and Environmental Services, LLC F:786.264.7201 UP Date: 11/14/2025 Time: 18:21 User: lvaldes Style Table: Langan.stb Layout: C-305 Document Code: 300375801-0503-CP101-0101 © Langan 2025 T:786.264.7200 www.langan.com WATERFRONT CENTER, SUITE A 72 KRONPRINDSENS GADE ST. THOMAS VI 00802 LICENSE NO: 1-61158-2B Langan Engineering and Environmental Services, LLC F:786.264.7201 X X X X UP Date: 11/14/2025 Time: 18:22 User: lvaldes Style Table: Langan.stb Layout: C-400 Document Code: 300375801-0503-CG101-0101 © Langan 2025 T:786.264.7200 www.langan.com WATERFRONT CENTER, SUITE A 72 KRONPRINDSENS GADE ST. THOMAS VI 00802 LICENSE NO: 1-61158-2B Langan Engineering and Environmental Services, LLC F:786.264.7201 X X X X Date: 11/14/2025 Time: 18:11 User: achong Style Table: Langan.stb Layout: C-410 Document Code: 300375801-0503-CG102-0101 © Langan 2025 T:786.264.7200 www.langan.com WATERFRONT CENTER, SUITE A 72 KRONPRINDSENS GADE ST. THOMAS VI 00802 LICENSE NO: 1-61158-2B Langan Engineering and Environmental Services, LLC F:786.264.7201 X UP Date: 11/14/2025 Time: 18:11 User: ahenderson Style Table: Langan.stb Layout: C-500 Document Code: 300375801-0503-CW101-0101 © Langan 2025 T:786.264.7200 www.langan.com WATERFRONT CENTER, SUITE A 72 KRONPRINDSENS GADE ST. THOMAS VI 00802 LICENSE NO: 1-61158-2B Langan Engineering and Environmental Services, LLC F:786.264.7201 X X X X UP UP UP UP UP UP Date: 11/14/2025 Time: 18:23 User: lvaldes Style Table: Langan.stb Layout: C-700 Document Code: 300375801-0503-CE101-0101 © Langan 2025 T:786.264.7200 www.langan.com WATERFRONT CENTER, SUITE A 72 KRONPRINDSENS GADE ST. THOMAS VI 00802 LICENSE NO: 1-61158-2B Langan Engineering and Environmental Services, LLC F:786.264.7201 INSTALLATION DETAIL ACCESSIBLE PARKING DETAIL SYMBOL ACCESSIBLE ACCESSIBLE PARKING SIGN ACCESSIBLE PARKING SIGN POLLUTANT RETARDANT BAFFLE DETAIL FRONT VIEW VARIES "H" 18" MAX. PIPE DIA. SOLID TOP (SEE NOTE #1) OPEN BOTTOM FLOW SIDE VIEW OUT FLOW IN HALF PIPE C.A.P. 3" (MIN.) 30" WITH 1/2" MOUNTING HOLES 1/2 ROUND TOP VIEW CORRUGATED 3" x 1/8" FLAT BAR TOP AND SIDES CONTINUOUS WELD THE BOTTOM ELEVATION OF THE POLLUTION RETARDANT EQUAL (1" x 2") SHALL BE INSTALLED ON THE SIDES NEOPRENE ADHESIVE BACKED GASKET, OR APPROVED POLLUTION RETARDANT BAFFLE TO BE FASTENED IN PLACE WITH 3/8"x4" STAINLESS STEEL "RED HEADS", OR APPROVED EQUAL. BAFFLE MUST BE AT LEAST 18" BELOW CONTROL ELEVATION. 5. 3. 2. 4. SHALL BE WELDED TO CLOSE OPENING AT THE TOP. ALUMINUM SHEET OF SAME THICKNESS (GAUGE) AS PIPE NOTES: 1. OPENING PIPE (SEE NOTE #3) NEOPRENE NEOPRENE GASKET (SEE NOTE #3) AND TOP OF ALL BAFFLES. ALL EXFILTRATION TRENCHES SHALL HAVE A POLLUTION STRUCTURE (SEE EXFILTRATION TRENCH DETAIL). RETARDANT BAFFLE AT EACH CONNECTION POINT TO A 18" MIN. 6. FIBERGLASS BAFFLES ARE NOT PERMITTED. SEE NOTE 2. 6" MAX. MOUNTING BRACKETS MAY BE ADDED TO FLAT BARS TO EASE INSTALLATION IN ROUND STRUCTURES. SPACING TO 7. MATCH HOLES IN FLAT BARS. SEE NOTE 7. ALUMINUM PIPE TYP. GASKET TYP. RECTANGULAR STRUCTURE 180 TOP VIEW ROUND STRUCTURE ROCK TRENCH DETAIL ROCK TRENCH DETAIL Date: 11/14/2025 Time: 18:23 User: lvaldes Style Table: Langan.stb Layout: C-800 Document Code: 300375801-0503-CU501-0101 SILT FENCE INLET SEDIMENT FILTER CONSTRUCTION ENTRANCE FDOT TYPE "D" DITCH BOTTOM INLET (STRC-03 AND STRC-04) © Langan 2025 T:786.264.7200 www.langan.com WATERFRONT CENTER, SUITE A 72 KRONPRINDSENS GADE ST. THOMAS VI 00802 LICENSE NO: 1-61158-2B Langan Engineering and Environmental Services, LLC F:786.264.7201