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HomeMy WebLinkAbout263.30 (2)GENERAL NOTES: 1.MAXIMUM VEGETATED FLOWPATH SLOPE IS 15% FOR ANY 20-FOOT REACH, AND MAY NOT EXCEED 20%. 2.SEE CONSTRUCTION PLANS FOR SPECIFIC PROJECT REQUIREMENTS.RIGHT-OF-WAYDRIVEWAY SLOPE 125'120'115'110'105'RIGHT-OF-WAY250'245'240'235'2" TO 4" ASPHALT BERM DETAIL PLAN - STEEP DRIVEWAY WITH DIAGONAL BERMS (≥15%) PLAN - STEEP DRIVEWAY WITH SLOTTED DRAINS (≥15%) 10' MIN. DISPERSION TRENCH DISPERSION TRENCH DETAIL 24'' MIN. UNDISTURBED NATIVE SOIL 2'' X 6'' UNTREATED CEDAR OR RECYCLED PLASTIC BOARD CRUSHED ROCK OR GRAVEL 1" DROP 18" MIN. 6" MIN. 3/4" - 1 1/2" WASHED DRAIN ROCK OR GRAVEL BACKFILL FOR DRYWELLS PER WSDOT STD. SPECIFICATION SECTION 9-03.12(5) 6" DIA. MIN. PERFORATED PVC, SDR 35 PER ASTM D3034 6'' MIN. 25' MIN. VEGETATED FLOWPATH, SEE NOTE 2 NO OVERLAP OF FLOWPATHS 2'x3'x6" MIN. ROCK PAD, SEE NOTE 3 50' MIN. VEGETATED FLOWPATH 10' MIN. 25' MIN. VEGETATED FLOWPATH, SEE NOTE 2 NO OVERLAP OF FLOWPATH SEGMENTS 25' MIN. VEGETATED FLOWPATH, SEE NOTE 2 6" MIN. DRIVEWAY SLOPE STREETSLOT DRAIN, SEE NOTE 4 700 SQ. FT. MAX. BETWEEN DRAINS, SEE NOTE 1 700 SQ FT MAX. BETWEEN BERMS, SEE NOTE 1 STREETDIAGONAL ASPHALT BERM, SEE NOTE 4 AREA DRAIN, SEE NOTE 5 NOTES: 1.SEE STD. PLAN ###### FOR ALTERNATE DISPERSION TRENCH IF CONTRIBUTING AREA EXCEEDS 700 SF. USE 10 LF OF TRENCH WITH NOTCH BOARD PER 700 SF TO MAX. 50 LF OF TRENCH. 2.IF DISCHARGE IS TOWARD A STEEP SLOPE HAZARD AREA OR A LANDSLIDE HAZARD STEEPER THAN 15%, VEGETATED FLOWPATH MUST BE 50 FEET. 3.MATERIAL FOR ROCK PAD TO BE 3/4" - 1 1/2" WASHED DRAIN ROCK OR GRAVEL BACKFILL FOR DRYWELLS PER WSDOT STD. SPECIFICATION SECTION 9-03.12(5).. 4.SLOT DRAINS OR ASPHALT BERMS MAY BE USED TO DIRECT RUNOFF TO ROCK PADS OR DISPERSION TRENCHES IN VARIOUS CONFIGURATIONS. LAYOUTS SHOWN ARE ONLY EXAMPLES. 5.MIN. 12"x12" AREA (YARD) DRAIN. DOWNSTREAM CONNECTED PIPE TO BE 6" DIA. MIN. PVC, SDR 35 PER ASTM D3034, SLOPED AT 1% MIN. NON-WOVEN GEOTEXTILE FOR SEPARATION PER WSDOT SPECIFICATIONS SECTION 9-33.2(1) TABLE 3 25' MIN. DISPERSION TRENCH 25' MIN. BASIC DISPERSION - STEEP SLOPE DRIVEWAYS PUBLIC WORKS DEPARTMENT APPROVED: DATEMartin Pastucha Public Works Administrator UNLESS OTHERWISE NOTED, DRAWING IS NOT TO SCALE (NTS) STD. PLAN - 263.30 DocuSign Envelope ID: 3B1B34D3-7E0A-476C-ADB3-4329FFE0C108 8/13/2020 | 8:48 AM PDT