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Home My WebLink AboutR-369909WET SEASON SPECIAL PROVISIONS ALL OF THE FOLLOWING PROVISIONS FOR WET SEASON CONSTRUCTION ARE DETAILED IN THE REFERENCED SECTIONS. THESE REQUIREMENTS ARE LISTED HERE FOR THE CONVENIENCE OF THE DESIGNER AND THE REVIEWER. 1. THE ALLOWED TIME THAT A DISTURBED AREA MAY REMAIN UNWORKED WITHOUT COVER MEASURES IS REDUCED TO TWO CONSECUTIVE WORKING DAYS, RATHER THAN SEVEN. 2. STOCKPILES AND STEEP CUT AND FILL SLOPES ARE TO BE PROTECTED IF UNWORKED FOR MORE THAN 12 HOURS. 3. COVER MATERIALS SUFFICIENT TO COVER ALL DISTURBED AREAS SHALL BE STOCKPILED ON SITE. 4. ALL AREAS THAT ARE TO BE UNWORKED DURING THE WET SEASON SHALL BE SEEDED WITHIN ONE WEEK OF THE BEGINNING OF THE WET SEASON. 5. MULCH IS REQUIRED TO PROTECT ALL SEEDED AREAS. 6. FIFTY LINEAR FEET OF SILT FENCE (AND THE NECESSARY STAKES) PER ACRE OF DISTURBANCE MUST BE STOCKPILED ON SITE. 7. CONSTRUCTION ROAD AND PARKING LOT STABILIZATION ARE REQUIRED FOR ALL SITES UNLESS THE SITE IS UNDERLAIN BY COARSE- GRAINED SOIL 8. SEDIMENT RETENTION IS REQUIRED UNLESS NO OFFSITE DISCHARGE IS ANTICIPATED FOR THE SPECIFIED DESIGN FLOW. 9. SURFACE WATER CONTROLS ARE REQUIRED UNLESS NO OFFSITE DISCHARGE IS ANTICIPATED FOR THE SPECIFIED DESIGN FLOW. 10. PHASING AND MORE CONSERVATIVE BMPS MUST BE EVALUATED FOR CONSTRUCTION ACTIVITY NEAR SURFACE WATERS. 11. ANY RUNOFF GENERATED BY DEWATERING MAY BE REQUIRED TO DISCHARGE TO THE SANITARY SEWER (WITH APPROPRIATE DISCHARGE AUTHORIZATION), PORTABLE SAND FILTER SYSTEMS, OR HOLDING TANKS. 12. THE FREQUENCY OF MAINTENANCE REVIEW INCREASES FROM MONTHLY TO WEEKLY. JOINTS IN FILTER FABRIC SHALL BE SPLICED AT POSTS. USE STAPLES, WIRE RINGS OR EQUIVALENT TO ATTACH FABRIC TO POSTS. ORANGE FILTER FABRIC MATERIAL (ONLY ADJACENT TO CRITICAL AREA STANDARD FILTER FABRIC MATERIAL 2" BY 2" BY 14 GA. WIRE FABRIC OR EQUIV. 2" BY 2" BY 14 GA. WIRE OR EQUIVALENT. IF STANDARD STRENGTH FABRIC USED. BURY BOTTOM OF FILTER MATERIAL 6' MAX. IN 4 "x4" TRENCH (4' MAX AT BOTTOM OF FILL SLOPES WITH STEEL POSTS) 2" BY 4" WOOD POSTS, STEEL FENCE POSTS, REBAR OR EQUIVALENT � EROSION /SEDIMENTATION CONTROL NOTES: 1. APPROVAL OF THIS EROSION AND SEDIMENTATION CONTROL (ESC) PLAN DOES NOT CONSTITUTE AN APPROVAL OF PERMANENT ROAD OR DRAINAGE DESIGN (E.G. SIZE AND LOCATION OF ROADS, PIPES, RESTRICTORS, CHANNELS, RETENTION FACILITIES, UTILITIES, ETC.) 2. THE IMPLEMENTATION OF THESE ESC PLANS AND THE CONSTRUCTION, MAINTENANCE, REPLACEMENT, AND UPGRADING OF THESE ESC FACILITIES IS THE RESPONSIBILITY OF THE APPLICANT /ESC SUPERVISOR UNTIL ALL CONSTRUCTION IS APPROVED. 3. THE BOUNDARIES OF THE CLEARING LIMITS SHOWN ON THIS PLAN SHALL BE CLEARLY FLAGGED BY SURVEY TAPE OR FENCING, IF REQUIRED, PRIOR TO CONSTRUCTION (SWDM APPENDIX D). DURING THE CONSTRUCTION PERIOD, NO DISTURBANCE BEYOND THE CLEARING LIMITS SHALL BE PERMITTED. THE CLEARING LIMITS SHALL BE MAINTAINED BY THE APPLICANT /ESC SUPERVISOR FOR THE DURATION OF CONSTRUCTION. 4. STABILIZED CONSTRUCTION ENTRANCES SHALL BE INSTALLED AT THE BEGINNING OF CONSTRUCTION AND MAINTAINED FOR THE DURATION OF THE PROJECT. ADDITIONAL MEASURES, SUCH AS CONSTRUCTED WHEEL WASH SYSTEMS OR WASH PADS, MAY BE REQUIRED TO ENSURE THAT ALL PAVED AREAS ARE KEPT CLEAN AND TRACK OUT TO ROAD RIGHT OF WAY DOES NOT OCCUR FOR THE DURATION OF THE PROJECT. 5. THE ESC FACILITIES SHOWN ON THIS PLAN MUST BE CONSTRUCTED PRIOR TO OR IN CONJUNCTION WITH ALL CLEARING AND GRADING SO AS TO ENSURE THAT THE TRANSPORT OF SEDIMENT TO SURFACE WATERS, DRAINAGE SYSTEMS, AND ADJACENT PROPERTIES IS MINIMIZED. 6. THE ESC FACILITIES SHOWN ON THIS PLAN ARE THE MINIMUM REQUIREMENTS FOR ANTICIPATED SITE CONDITIONS. DURING THE CONSTRUCTION PERIOD, THESE ESC FACILITIES SHALL BE UPGRADED AS NEEDED FOR UNEXPECTED STORM EVENTS AND MODIFIED TO ACCOUNT FOR CHANGING SITE CONDITIONS (E.G. ADDITIONAL COVER MEASURES, ADDITIONAL SUMP PUMPS, RELOCATION OF DITCHES AND SILT FENCES, PERIMETER PROTECTION ETC.). 7. THE ESC FACILITIES SHALL BE INSPECTED DAILY BY THE APPLICANT /ESC SUPERVISOR AND MAINTAINED TO ENSURE CONTINUED PROPER FUNCTIONING. WRITTEN RECORDS SHALL BE KEPT OF WEEKLY REVIEWS OF THE ESC FACILITIES. 8. ANY AREAS OF EXPOSED SOILS, INCLUDING ROADWAY EMBANKMENTS, THAT WILL NOT BE DISTURBED FOR TWO DAYS DURING THE WET SEASON OR SEVEN DAYS DURING THE DRY SEASON SHALL BE IMMEDIATELY STABILIZED WITH THE APPROVED ESC COVER METHODS (E.G., SEEDING, MULCHING, PLASTIC COVERING, ETC.). 9. ANY AREA NEEDING ESC MEASURES, NOT REQUIRING IMMEDIATE ATTENTION, SHALL BE ADDRESSED WITHIN SEVEN (7) DAYS. 10. THE ESC FACILITIES ON INACTIVE SITES SHALL BE INSPECTED AND MAINTAINED A MINIMUM OF ONCE A MONTH OR WITHIN 24 HOURS FOLLOWING A STORM EVENT. 11. AT NO TIME SHALL MORE THAN ONE (1) FOOT OF SEDIMENT BE ALLOWED TO ACCUMULATE WITHIN A CATCH BASIN. ALL CATCH BASINS AND CONVEYANCE LINES SHALL BE CLEANED PRIOR TO PAVING. THE CLEANING OPERATION SHALL NOT FLUSH SEDIMENT -LADEN WATER INTO THE DOWNSTREAM SYSTEM. 12. ANY PERMANENT RETENTION /DETENTION FACILITY USED AS A TEMPORARY SETTLING BASIN SHALL BE MODIFIED WITH THE NECESSARY EROSION CONTROL MEASURES AND SHALL PROVIDE ADEQUATE STORAGE CAPACITY. IF THE PERMANENT FACILITY IS TO FUNCTION ULTIMATELY AS AN INFILTRATION SYSTEM, THE TEMPORARY FACILITY MUST BE ROUGH GRADED SO THAT THE BOTTOM AND SIDES ARE AT LEAST THREE FEET ABOVE THE FINAL GRADE OF THE PERMANENT FACILITY. 13. COVER MEASURES WILL BE APPLIED IN CONFORMANCE WITH APPENDIX 0 OF THE SURFACE WATER DESIGN MANUAL. 14. PRIOR TO THE BEGINNING OF THE WET SEASON (OCT. 1), ALL DISTURBED AREAS SHALL BE REVIEWED TO IDENTIFY WHICH ONES CAN BE SEEDED IN PREPARATION FOR THE WINTER RAINS. DISTURBED AREAS SHALL BE SEEDED WITHIN ONE WEEK OF THE BEGINNING OF THE WET SEASON. A SKETCH MAP OF THOSE AREAS TO BE SEEDED AND THOSE AREAS TO REMAIN UNCOVERED SHALL BE SUBMITTED TO THE DOES INSPECTOR FOR REVIEW. 15, THE SOIL MOISTURE HOLDING CAPACITY OF ALL NEW PERVIOUS SURFACE THAT AT PROJECT COMPLETION WILL NOT BE COVERED BY IMPERVIOUS SURFACE OR INCORPORATED INTO A DRAINAGE FACILITY MUST BE PROTECTED. THE DUFF LAYER AND NATIVE TOPSOIL SHALL BE RETAINED IN A UNDISTURBED STATE THE THE MAXIMUM STENT FEASIBLE. 16. ANY DUFF LAYER OR TOPSOIL REMOVED DURING GRADING SHALL BE STOCKPILED ONSITE IN A DESIGNATED, CONTROLLED AREA NOT ADJACENT TO PUBLIC RESOURCES AND CRITICAL AREAS. THE MATERIAL SHALL BE REAPPLIED TO THE OTHER PORTIONS OF THE SIRE WHERE FEASIBLE. 17. THE SOIL IN ANY AREA THAT HAS BEEN COMPACTED OR THAT HAS HAD SOME OR ALL OF THE DUFF LAYER OR UNDERLYING TOPSOIL REMOVED SHALL BE AMENDED TO MITIGATE FOR LOST OF MOISRUTE- HOLDING CAPACITY. THE AMENDMENT SHALL TAKE PLACE BETWEEN 8 AND 13 PERCENT DRY WEIGHT AND A PH SUITABLE FOR THE PROPOSED LANDSCAPE PLANTS. SURFACE AREA DETERMINED AT TOP OF WEIR � BOTTOM DIMENSIONS 2 " -4" ROCK 3/4•_1_1/2• WASHED GRAVEL NOTE: TRAP MAY BE FORMED BY BERM OR BY PARTIAL OR COMPLETE EXCAVATION. I!1Rw*Pi4[iyUE7 ,1' MIN. DISCHARGE TO STABILIZED CONVEYANCE, OUTLET OR LEVEL SPREADER. RUNOFF WATER WITH SEDIMENT CATCH BASIN W /GRATE FILTER FABRIC GEOTEXTILE MATERIAL-/ \-OVERFLOW FILTERED WATER INLET PROTECTION DETAIL NOT TO SCALE i / ao 0 o 0 0° o eo o ° 'o o 0 R =25' 4 " -8" QUARRY SPALLS GEOTEXTILE 12" THICK MIN. INSTALL DRIVEWAY CULVERT IF THERE IS A ROADSIDE DITCH PRESENT. AS PER KING COUNTY ROAD STANDARDS. 9 ROADWAY. AS PER KING COUNTY ROAD STANDARDS, DRIVEWAYS SHALL BE PAVED TO THE EDGE OF R -O -W PRIOR TO INSTALLATION OF THE CONSTRUCTION ENTRANCE TO AVOID DAMAGING THE IT IS RECOMMENDED THAT THE ENTRANCE BE CROWNED SO THAT RUNOFF DRAINS OFF THE PAD. THE LENGTH OF THE ROCK -LINED CONSTRUCTION ENTRANCE MUST BE A MINIMUM OF 100 FEET ON SITES WITH MORE THAN ONE ACRE OF EXPOSED SOIL. PRA ROCK -LINED CONSTRUCTION ENTRANCE DETAIL NOT TO SCALE 3' MIN. 4' cocconeon ... R- 369909 * DEPENDING ON SOIL CONDITIONS SWALE 3" MIN. 2 ]1 A SPACING BETWEEN CHECK DAMS: L = THE DISTANCE SUCH THAT POINTS A & B ARE OF EQUAL ELEVATION TO 4" QUARRY SPALLS 3" MIN. NOTE: IF THE IDS OR SCC DO NOT REGULARLY RETAIN STORM RUNOFF. THE CAPACITY AND /OR FREQUENCY OF THEM SHALL BE INCREASED. B IDS & SCC w/ ROCK CHECK DAM NOT TO SCALE 2 CHECKED FOR COMPLIANCE TO CITY STANDARDS Date Date REVISIONS NO. I I� CROSS - SECTION MINIMUM 4 "x4" TRENCH B,ACKFlLL ll TRENCH WITH NATIVE SOIL OR 3/4 " -1.5" WASHED GRAVEL 8" 6' MIN. FILTER FABRIC FENCES SHALL BE INSTALLED - ALONG CONTOUR WHENEVER POSSIBLE. FREEBOARD - 4q'..��STE�•i IOIIAL 1' MIN. DEPTH OVERFLOW t. ANY DAMAGE SHALL BE REPAIRED IMMEDIATELY. OVERFLOW - - SPIyyLL••pWpppAYy�.._oo CY 2- og W w ae Z 99 2. IF CONCENTRATED FLOWS ARE EVIDENT UPHILL OF THE FENCE, THEY MUST BE INTERCEPTED AND CONVEYED TO A Zo n" 7 « c SEDIMENT TRAP OR POND. E °a 1-m3 E z� y am O m Nm3 ° Zom > aP Ja O0i 3. IT IS IMPORTANT TO CHECK THE UPHILL SIDE OF THE FENCE FOR SIGNS OF THE FENCE CLOGGING AND ACTING AS - O "sa 3 3 A BARRIER TO FLOW AND THEN CAUSING CHANNEUZATION OF FLOWS PARALLEL TO THE FENCE. IF THIS OCCURS, NATIVE SOIL OR MIN. 1' DEPTH 2 " -4" ROCK wD COMPACTED BACKFlLL V Z o O REPLACE THE FENCE AND /OR REMOVE THE TRAPPED SEDIMENT. � ZO O0 Z _ MIN. 1' DEPTH 3/4 "- 1 -1/2" 4. SEDIMENT MUST BE REMOVED WHEN THE SEDIMENT IS 6" HIGH. WASHED GRAVEL 0 L .? 5. IF THE FILTER FABRIC HAS DETERIORATED DUE TO ULTRAVIOLET BREAKDOWN, IT SHALL BE REPLACED. TRAP OUTLET O J J< tz 3 Q TYPICAL ORANGE FILTER FENCE DETAIL m QY SEDIMENT TRAP r N LU NOT TO SCALE � I_ Z NOT TO SCALE m H 0 WW , D rip / j F qZ F 0 0 Z n N LU < cj In Lo wN 0 w Cn W F-: U! Z K RUNOFF WATER WITH SEDIMENT CATCH BASIN W /GRATE FILTER FABRIC GEOTEXTILE MATERIAL-/ \-OVERFLOW FILTERED WATER INLET PROTECTION DETAIL NOT TO SCALE i / ao 0 o 0 0° o eo o ° 'o o 0 R =25' 4 " -8" QUARRY SPALLS GEOTEXTILE 12" THICK MIN. INSTALL DRIVEWAY CULVERT IF THERE IS A ROADSIDE DITCH PRESENT. AS PER KING COUNTY ROAD STANDARDS. 9 ROADWAY. AS PER KING COUNTY ROAD STANDARDS, DRIVEWAYS SHALL BE PAVED TO THE EDGE OF R -O -W PRIOR TO INSTALLATION OF THE CONSTRUCTION ENTRANCE TO AVOID DAMAGING THE IT IS RECOMMENDED THAT THE ENTRANCE BE CROWNED SO THAT RUNOFF DRAINS OFF THE PAD. THE LENGTH OF THE ROCK -LINED CONSTRUCTION ENTRANCE MUST BE A MINIMUM OF 100 FEET ON SITES WITH MORE THAN ONE ACRE OF EXPOSED SOIL. PRA ROCK -LINED CONSTRUCTION ENTRANCE DETAIL NOT TO SCALE 3' MIN. 4' cocconeon ... R- 369909 * DEPENDING ON SOIL CONDITIONS SWALE 3" MIN. 2 ]1 A SPACING BETWEEN CHECK DAMS: L = THE DISTANCE SUCH THAT POINTS A & B ARE OF EQUAL ELEVATION TO 4" QUARRY SPALLS 3" MIN. NOTE: IF THE IDS OR SCC DO NOT REGULARLY RETAIN STORM RUNOFF. THE CAPACITY AND /OR FREQUENCY OF THEM SHALL BE INCREASED. B IDS & SCC w/ ROCK CHECK DAM NOT TO SCALE 2 CHECKED FOR COMPLIANCE TO CITY STANDARDS Date Date REVISIONS NO. DESCRIPIKIN TE B! 1 - 4q'..��STE�•i IOIIAL � •a •T3 .8w^ CY 2- og W w ae Z 99 U Zo WNM 20, « c Sm ZNm E °a 1-m3 E z� y am O m Nm3 ° Zom > aP Ja O0i E - O � 3 3 � **x c0 P3 wD >° oa' V Z O ao � ZO O0 Z _ 0 3 Z Z L U a O J J< tz 3 Q _0 Z LU QY r N LU � I_ Z MM LL 1- 0 WW , / j F qZ F 0 0 Z n N LU < cj In Lo wN 0 w ULo W F-: U! Z K U. O U JOB NO.: 1320 - 005 -008 DWG. NAME: OR-03 DESIGNED BY: LOS DRAWN BY: JJH CHECKED BY: DATE: 09 /06/2013 DATE OF PRINT: GR -a3 9 OF 1 / SHEETS