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HomeMy WebLinkAbout224.00 (replaced 2020)1.THIS TRENCH SHALL BE CONSTRUCTED SO AS TO PREVENT POINT DISCHARGE AND/OR EROSION. 2.TRENCHES MAY BE PLACED NO CLOSER THAN 50 FEET TO ONE ANOTHER, 10 FEET MINIMUM TO ANY BUILDING (100 FEET ALONG FLOWLINE). 3.TRENCH AND GRADE BOARD MUST BE LEVEL. ALIGN TO FOLLOW CONTOURS OF SITE. 4.SUPPORT POST SPACING AS REQUIRED BY SOIL CONDITIONS TO ENSURE GRADE BOARD REMAINS LEVEL. 5.15% MAX UNLESS OTHERWISE EVALUATED AND APPROVED, SEE SECTION C.2.1.1. 6.GRADE BOARD AND SUPPORT POST TO BE UNTREATED CEDAR OR RECYCLED PLASTIC. SPACE SUPPORT POSTS EVERY 10 FEET MINIMUM. 7.GEOTEXTILE TO BE NON-WOVEN TYPE FOR SEPARATION PER WSDOT 9-33.2(1). NOTES: INFLUENT PIPE (MAX DESIGN FLOW <0.5 CFS PER TRENCH) FLOW TO SECOND DISPERSAL TRENCH IF NECESSARY FLOW TO OTHER BRANCHING CB'S AS NECESSARY 12" MIN. PIPE O.D. 12" MIN. 50' MAX. NOTCHED GRADE BOARD, 2"x2" NOTCHES, 18" O.C. 2" GRADE BOARD NOTCHES (TYP.)18" O.C. 2" (TYP.) 6" MIN. PERFORATED PIPE LAID FLAT/LEVEL CLEAN (<5% FINES) 3/4" -1 1/2" WASHED ROCK 4"x4" SUPPORT POST, SEE NOTE 6 SECTION A 6" MIN. 12" MIN. 36" MAX. WRAP TRENCH SIDES WITH GEOTEXTILE (LEAVE TOP AND BOTTOM EXPOSED), SEE NOTE 7 GALVANIZED BOLT (TYP.) 2"x12" GRADE BOARD, SEE NOTE 6 NOTCH DETAIL PLAN A 15% MAX, SEE NOTE 5 15% MA X , S E E NOTE 5 TYPE 1 CB WITH SOLID COVER TYPE 1 CATCH BASIN (CB) WITH SOLID COVER CAPPED CLEANOUT WYE FROM PIPE END CAP OR PLUG EXPOSED ROCK, DO NOT FILL 50-FOOT DISPERSION TRENCH WITH NOTCHED BOARD STD. PLAN - 224.00 PUBLIC WORKS DEPARTMENT APPROVED: DATEGregg Zimmerman Public Works Administrator UNLESS OTHERWISE NOTED, DRAWING IS NOT TO SCALE (NTS) DocuSign Envelope ID: 6EECF5B6-602A-4E4A-B436-A317AA638878 9/28/2018 | 9:45 AM PDT