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Home My WebLink AboutR-411504C) d- 2 T.L. 324320-0120 \�/ .�s� I SMALL (2'x2' RIP RAP PAD 16337 SE 131 ST PL I 30' TO PROTECT OUTLET I - � I COORINDINATE WITH OWNER ----- - - TO MAINTAIN ACCESS TO - Ii EXIS77NG DRIVEWAY I � o GRAVEL OR COLD PATCH RESTORE GROUND I ! S8 COVER IN KIND ONCE ;j TRENCH IS BACKFlLLED T.L. 132305-9145 ADDRESS: 13120 164TH AVE SE R-4 T.L. 324320-0150 T.L. 324320-0130�- �4DDRESS: 16320 SE 132ND ST I ADDRESS:16332 SE 132ND ST I - T.L. 324320-0140 I R-4 I - ADDRESS: 16326 SE 132ND ST I _ ICONSTRUCTION ENTRANCE PER COR STD 215.10 I �Q62 0- 016 0 I R 4 SEE SHEET 5 SE 132ND ST I I (CONTRACTOR TO MAINTAIN LWp' 0 ACCESS TO RESIDENCE ON R - 4 T.L. 132305-9027 w R-4 I Q'' T.L. 132305-9027 UTILIZE STORMWATER VAULT FOR \ = _ ADDRESS: 13200 164TH AVE SE SEDIMENTATION OF CONSTRUCTION SITE i r I RUNOFF. VAC TRUCK CLEANING AS L, REQUIRED AND ONCE CONSTRUCTION IS - - so - - - _ _ _ I COORINDINATE WITH OWNER COMPLETE/SITE IS STABILIZED. TO MAINTAIN ACCESS TO - - EXISTING DRIVEWAY TREE PROTECTION FENCE " � S. 132 STREET I - - - 3 DETAIL SEE SHEET 5 (TYP) -- - -- \--JL_ - -JL �\ b I TREES TO BE RETAINED TYP RE ( ) - TY i i -ram -- --- � - -- -_ _�- - - - - - \ OWN CIVo`O-,: KING O - - -- -- / 0 0027 C) \ SE 132ND S I I ° d � \ ' /� � /�460 a a \ ---- -- \462--OTC d \ ° d X a _ X _ d X _ \ - X d' X 4 - X � \ / / X i - - X - - d - 4 oo a i d o � o 0 x - { x / ADDRESS: 1 16327 0SE - 132ND I \ I ° � I a � � MULCH AND I - 4 ° I I HYDROSEED SL01 \ I I \ ---- - ONCE FINAL \ _x� X GRADES ARE I a A v ---- REACHED a a \ e I PROVIDE CONCRETE t --- -- \ -\ -- WASHOUT FACILITY > HYDROSEED I \ - I I' J II \ / I a, I I \� I I HIGH VISIBILITY SILT FENCE II I T.L. 132305-9093 \ I \ q PER COR STD 214.00 I I ADDRESS: 13139 ISEE SHEET 5 (TIP) I 166TH AVE SE I I o v z I INSTALL TEMPORARY II I ° / a I I J �, I INTERCEPTORSWALE } - ' ----- WITH CHECI DAMS (TYP) / l II I / / - CONSTRUCTOIN LIMITS I (Tw) �► Lu _X _x PRESERVE EX. / / I R- 4 I I I / T VEGETATION PER / I '� I INSTALL TEMPORARY I I / , BMP C101COUNTY T.L. 145750-0023 I 61 LF 12 CULVERT KING I NG ® 2.00% MIN I I �I I MULCH HYDROSEED 4 64 ° / I STOCKPILE AREA I APPLY GRAVEL I I - - RENTON / / ( COVER:W/PLASTIC / \ I SHEETING AS NEEDEDSURFACE ONCE/ _ - - - UTILITIES AREA I / I I INSTALLED I �\ T.L. 132305-90` CAT NSERT U71LIZE STORMWATER VAULT FOR PER CCOR STD H BASIN 1216.30 SEDIMENTATION OF CONSTRUCTION SITE T.L. 132305-9045 SEE SHEET 5 (TYP) RUNOFF. VAC TRUCK CLEANING A ADDRESS: 13231 REQUIRED AND ONCE CONSTRUCTI N IS i 16 6 TH AVE SE COMPLETE/SITE IS STABILIZED. / I�x4 D R-4/ - ---- I I I I SILT FENCE PER COR STD 214.00 1 �� I I / EX TREE TO BE SEE SHEET 5 (TYP) REMOVED (TYP) � xx_X XI 6 i T.L. 145750-0025 x -x � ._ i / -� _-464 16210 SE 134TH ST 4I - 62 - - -� R CLEARING LIMITS (TIP) : I X -462- - - _ _ / R N, I Encompass ENGINEERING & SURVEYING Western Washington Division 165 NE Juniper Street, Suite 201 ■ IssaQuah, WA 98027 • Phone: (425) 392-0250 Eastern Washington Division 407 Swiftwater Blvd. • Cle Elum, WA 98922 • Phone: (509) 674-7433 INSTALL TEMPORARY ' 68 LF 12" CULVERT 0 2.00X1 MIN pHILIp 0F WASH �I �' SEE SHEET 17 I FOR ON71NUA7I0N 3 REVISIONS PER CITY COMMENTS DATED 612312021 38375 �� 2 REVISIONS PER CITY COMMENTS DATED 4/07/2021 IST o 1 REVISIONS PER CITY COMMENTS DATED 112512020 ss10 L �yG 0710112021 NO. REVISION GOON KING SURVEYED: SDM DESIGNED: NEM CID 0710112021 CID 0410812021 DRAWN. TLK PMD 1111212020 CHECKED: EDM BY DATE AP P R APPROVED: CJA SCALE: EROSION AND SEDIMENT CONTROL JESC) STANDARD PLAN NOTES: THE FOLLOWING IS A LISTING OF GENERAL NOTES THAT SHALL BE INCORPORATED IN THE EROSION AND SEDIMENT CONTROL (ESC) PLAN SET. ALL THE NOTES ON THE LIST MAY NOT PERTAIIN TO EVERY PROJECT THE APPLICANT OR OWNER, HERESY REFEIRI`WD TO AS APPLICANT. MAY STRIKE OUT IRRELEVANT NOTES IF NOT APPLICABLE TO THE PROJECT. HOWEVER, THE APPLr'.ARTT SHALL NOT RENUMBER NOR EDIT THE REMA3NiNG NOTES. IF ADDITIONAL NOTES ARE NEEDED FOR SPECIFIC ASPECTS, THEY SHALL BE ADDED AFTER THE ESC STANDARD PLAN NOTES. 1 BEFORE ANY CONSTRUCTION OR DEVELOPMENT ACTIVITY OCCURS, A PRE -CONSTRUCTION MEETING SHALL BE HELD AMC"G THE CITY OF RENTON, HEREBY REFERRED TO AS THE CITY, THE APPLICANT, AHD THE APPLICANT'S CONTRACTOR, 2. THE APPLICANT IS RESPONSIBLE FOR OBTAINING THE WASH NCTON STATE DEPARTMENT OF ECOLOGY (ECOLOGY) CONSTRUCTION STORMWATER. GENERAL PERMIT, IF a IS RECUIREd FOR THE PROJECT- THE APPLICANT SHALL PROV05 THE CITY COP4ES OF ALL MONFTORING REPORTS PROVIDED l 0 ECC]LOGY ASSDr,IATED WITH THIS CON$TRUCTEDN STORMWATER GENERAL PERMIT. 3. THE ESC PLAN SIT SHALL. INCLUDE AN ESC CONSTRUCTION SEQUENCE PFTNLIN5 THE ORDERED STEPS THAT SHALL 13E FOLLOWED FROM COWQ TRUCTIQN COMMENCEMENT TO POST -PROJECT CLEANUP IN ORDER TO FULFILL PROJECT ESC RIEDUIREMENT5 4 THE SOUNDARIES OF THE CLEARING LIMTrS, SENSITIIVE AREAS AND THEIR BUFFERS. A"D AREAS OF VEGETATICN PRESERVATION AND TREE RETENTION AS PRESCRIBED ON THE PLAN(SI SHALL BE CLEARLY DELINEATED BY FENDING AND PROTECTED IN THE FIELD IN ACCORDANCE WITH APPENDIX D OF THE CITY OF RENTON SURFACE WATER DESIGN MANUAL (RENTON SWDM} PRIOR TO THE START OF CONSTRUCTION. DURING THE CONSTRUCTION PERIOD. NO DISTURBANCE BEYOND THE CLEARING LIMITS SHALL BE PERMITTED T4E CLEARING LIMITS SHALL BE MAINTALNED BY THE APPLICAMT15SC SUPERVISOR FOR THE DURATION OF CONSTRUCTION 5. STABILIZED CONSTRUCTION ENTRANCES SHAD. BE INSTALLED AT THE flEGINNINO OF CONSTRUCTION AND MAINTAINED FOR THE DURATION OF THE PROJECT. ADDITIONAL MEASURES. SUCH AS CONSTRUCTED WHEEL WASH SYSTEMS OR WASH PADS, MAY BE REQUIRED TO ENSURE THAT ALL PAVER AREAS ARE KEPT CLEAN AND TRACK -OUT TO ROAD RIGHT OF WAY DOES NOT OCCUR FOR THE DURATION OF THE PROJECT. IF SEDIMENT IS TRACKED OFFSITE, PUBLIC ROADS SHALL BE CLEANED THOROUGHLY AT THE MD OF EACH DAY. OR MORE FREQUENTLY DURING WET WEATHER, AS NECESSARY TO PREVENT SEDIMENT FROM ENTERING WATERS OF THE STATE. 6. WASHOUT FROM CONCRETE TRUCKS SHALL BE PERFORMED OFFSrrE OR IN DESEGNATED CONCRETE WASHOUT AREAS ONLY. DO NOT WASH OUT CONCRETE TRUCKS ONTO T!-IE GROUND, OR TO STORM DRAIN$ OR OPEN DITCHES. ON-5ITE DUMPING OF EXCESS CONCRETE SHALL ONLY OCCUR IN DESIGNATED CONCRETE WASHOUT AREAS 7. ALL REQUIRED ESC BMPS SHALL BE CONSTRUCTED AND IN OPERATION PRIOR TO LAND CLEARING ANDiDR CONSTRUC71CN 70 PREVENT TRANSPCFRTA71ON OF SEDIMENT TO SURFACE WATER, ORAINAGE SYSTEMS AND ADJACENT PROPERTIES. ALL ESC 8MRS SHALL BE MAINTAINED IN A SATISFACTORY CONDITION UNTIL SUCH TIME THAT CLEARING AIdDfOR CONSTRUCTION 18 COMPLETE ANr3 PDTEmTCAL FOR ONSITF P$�DSION HAS PASSED- ALL ESC BMPS SHALL BE REMOVED AFTER CONSTRUCTION IS COMPLETED AND THE SITE HAS BEEN STABILIz!ED TO ENSURE PaT1=NTIAL FOR OWSITE EROSION DOES NOT EXIST- THE IMPLEMENTATION, MAINTENANCE, REPLACEMENT- ENHANCEMENT. AND REMOVAL OF E$C BMPS SHALL BE THE RESPONSIBILITY OF THE APPLICANT. 8 ANY HAZARDOUS MATERIA4S OR I-IQQID PRODUCTS THAT HAVE THE PQTT;NTIAL TO P044TF Ri)NOFF SHAI..L BE PISPQ$ED OF PROPERLY g. THE ESC BMPS DEPICTED 0" THIS DRAWING ARE INTENDED TO BE MINIMUM REQUIREMENTS TO MEET ANTIGIPAT51) SITE CONDITIONS. AS CONSTRUCTION PROGRESSES AND UNEXPECTED OR SEASONAL CONDITIONS DICTATE, THE APPLICANT SHALL ANTICIPATE THAT MORE ESC BMPS WILL BE NECESSARY TO ENSURE COMPLETE SILTATION CONTROL ON THE PROPOSED SITE. DURING THE COURSE OF CONSTRUCTION. IT SHALL BE THE OBLIGATION AND RESPONSIBILITY OF THE APPLICANT TO ADDRESS ANY NEW CONDITIONS THAT MAY BE CREATED BY 7HE ACTRAT1ES AND TO PROVIDE ADDITIONAL ESC BMPS, OVER AND ABOVE MIt0IMUM REQUIREMENTS, AS MAY BE NEEDED, 70 PROTECT ADJACENT PROPERTIES AND WATER OUAUTY OF THE RECEIVING DRAINAGE SYSTEM. 10. APPROVAL OF THIS PLAN iS FOR ESC ONLY. IT DOES NOT CONSTITUTE AN APPROVAL OF STORM DRAINAGE DESIGN. SIZE NOR LOCATION OF PIPES, RESTRICTORS CHANNELS, OR STORMWATER FACILITIES. 11 ANY DEWATERING SYSTEM NECESSARY FOR THE CONSTRUCTION OF STORMWATER FACILITIES SHALL BE SUBMITTED TO THE CITY FOR REVIEW AND APPROVAL. 12. ANY AREAS OF EXPOSED SOILS, INCLUDING ROADWAY EMBANKMENTS. THAT WILL NOT BE DISTURBED FOR TWO DAYS DURING THE WET SEASON (OCTOBER 1 ST THROUGH APR IL 30TH} OR SEVEN DAYS DURING TFIE DRY SEASON (MAY TST THROUGH SEPTEMBER 30T�-o SHALL BE IMMEDIATELY STABILIZED W17H THE APPROVED ESC COVER METHODS (EG., SEEDING, MULCHING, PLASTIC COYERFNG, FTC.) IN CONFORMANCE WITH APPEND1x D OF THE RENTON SSNDM. 13. WET SEAS C)N ESC REDLRREMENT5 APPLY TO ALL CONSTRUCTION SITES BETWEEN ❑CTOBER 1ST AND APRIL 39TH, UNLESS OTHERWISE APPROVED BY THE CITY- 14. ANY AREA NEEDING ADDITIONAL ESC MEA15URE S. NOT REQUIRING IMMEDIATE ATTI=KTION, $HALL 5F p,DDRESSED VATKIN SEVEN (7) DAY$- 1 M N4 I H INSPECTED A A I H 4HE IN M NT S, THE ESG 8 PS g INACTIVE SITE SHALL BI< AN{11u1+0.1kTA NED T MINIMUM OF Q+�ICE A MONTH OR WITHIN 2 OUR$ FOLLOWING A STORM EVE INSPECTION AND MAINTENANCE SHALL DCCUR MORE FREQUENTLY AS REQUIRED BY THE CITY. 16. BEFORE COMMENCEMENT OF ANY GO;'lSTRUCTION ACTIVITY, CATCH BASIN INSERTS PER THE CITY STANDARD PLAN 216.30 SHALL BE PROVIDED FOR ALL STORM DRAIN INLETS DOWUSLOPE AND WITHIN 501) FEET OF A DISTURBED OR CONSTRUCTION AREA, UNLESS THE RUNOFF THAT ENTERS THE INLET WILL BE CONVEYED TO A SEDIMENT POND OR TRAP ALL CATCH BASIN INSERTS SHALL 8E PERIODICALLY INSPECTED AND REPLACED AS NECESSARY TO ENSURE FULLY FUNCTIONING CONDITION. 17. AT NO TIME SHALL SEDIMENT ACCUMULATION EXCEED 213 OF THE CAPACITY OF THE CATCH a4S1N SUMP. ALL CATCH BASINS AND CONVEYANCE LINES SHALL BE CLEANED P IOR Tq PAVING. THE GLEANING OPERATION FLUSH SEDIMENT-LADEN WATER INTO THE DOWNSTREAM SYSTEM. 18. ANY PERMANENT STORMWATER FACILITY LOCATION USED AS A TEMPORARY SETTLING BASIN SHALL BE MODIFIED WITH THE NECESSARY ESC BMPS AND SHALL PROVIDE ADEQUATE STORAGE CAPACITY. IF THE TEMPORARY FACILITY IS TO ULTIMATELY FUNCTION AS AN INFILTRATION SYSTEM IN ITS PERMANENT STATE. TH€ TEMPORARY FACILITY SHALL BE ROUGH GRADED SO THAT THE BOTTOM AND SIDES ARE AT LEAST THREE FEET ABOVE THE FINAL rIRADF_ OF THE PERMANENT FACILFIY. 19, AREAS DESIGNATED ON THE PLAN($) CONTAINING EXISTING STORM*ATFR FACILRIE5 OR ONSFTE BMPS SAME;N❑IED SAILS, BIORETENTION, PFRMENI LE PAVEMENT ETC ) SHALL BE CLEARLY FENCED AND PROTECTED USING ESC BMPS TO AVOID SEDIMENTATION AND COMPACTION DURING CONSTRUCTK)N 20. PRIOR TO THE BEGINNING CIF THE WET SEASON (OCTOBER 18T), ALL DISTURBED AREAS SHALL BE INSPECTED TO IDENTIFY WHICH ONES SHALL BE SODDED OR I TI T FT L SEEDED N PREPARA ON FOR THE WINTER RAINS DISTURBED AREAS SHALL 6E SG+I3DED OR SEEDED WITi a3T1E WEEK D HE BEG NNING OF THE WET SEAS AN EXHIBIT OF THOSE AREAS TO BE SODDED OR SEEDED AND THOSE AREAS TO REMAIN UNCOVERED SHALL BE SUBMITTED TO THE CITY FOR REVIEW. 21. PRIOR TO FINAL CiJmTRUCTION ACCEPTANCE, THE PROJECT 8171= SHALL 9E $TABILI7�D TO PREVENT SEDIMENT -LADEN WATER I` ROM LEAVING THE PROJECT SITE ALL ESC Emps SHALL BE REMOVED. ANb STORMWATER CONVEYANCE SYSTEMS, FACILITIES, AN ON -SITE BMPS SHALL BE RESTORE➢ TD TMEJR FULLY Fl1NCTIONIlJC+C4NOrr[QN. ALL DIST[1R5�0 AREA$ E]F THE PROJECT $ITS SHAH EE VEGETATED 4R OTHERWISE PERMANENTLY STABILIZER. AT A L.1I NLMUI.1. DI5TURBED AREAS SHALL BE SODDED OR SEEDED AND MULCHI<D TO ENSURE THAT SUFFICIENT COVER WILL DEVELOP SHORTLY AFTER FINAL APPROVAL, MULCH WITHOUT SEEDING IS ADEQUATE FOR AREAS TO BE LANDSCAPED BEFORE OCTOBER 16T. 22. ROCKERIES ARE CONSIDERED TO BE A METHOD OF BANK STABILIZATION AND EROSION CONTROL ROCKERIES SHALL NOT BE CONSTRUCTED TO SERVE AS RETAINING WALLS. ALL ROCKERIES IN CITY ROAD !UG+iTS-OF•WAY SHALL BE CONSTRUCTED IN ACCORDANCE WITH CITY STANDARDS. ROCKERIES OUTSIDE OF ROAD RIGMTS-OF-WAY SHALL BE CONSTRUCTED IN ACCORDANCE WITH THE INTERNATIONAL BUILDING CODE UNLESS OTHERWISE AIoM, ()RAW[NG 15 NOT TO SCALL (NT51 aftk STD, PLAN - 2fi8.00 URIPUBLIC WORKS EROSION AND SEDIMENT CONTROL PRI;. .n DEPARTMENT GAZ 912812018 1 STANDARD PLAN NOT€S Pik Wa4ANliriniw�ionni CONSTRUCTION SEQUENCE: 1. PRE -CONSTRUCTION MEETING. 2. POST NOTICE OF CONSTRUCTION ACTIVITY SIGN WITH NAME AND PHONE NUMBER OF ESC SUPERVISOR. 3. FLAG OR FENCE CLEARING LIMITS. 4. INSTALL CATCH BASIN PROTECTION IF REQUIRED. 5. GRADE AND INSTALL CONSTRUCTION ENTRANCE(S). 6. INSTALL PERIMETER PROTECTION (SILT FENCE, BRUSH BARRIER, ETC.). 7. CONSTRUCT SURFACE WATER CONTROLS (INTERCEPTOR DIKES, PIPE SLOPE DRAINS, ETC.) SIMULTANEOUSLY WITH CLEARING AND GRADING FOR PROJECT DEVELOPMENT. 8. EXCAVATE FOR STORMWATER DETENTION VAULTS. VAULT EXCAVATIONS SHALL BE USED FOR TESC STORM DETENTION. VAULT CONSTRUCTION SHALL BE STAGGERED AND PUMPS KEPT ON SITE SO THAT STORMWATER CAN BE TRANSFERRED BETWEEN EXCAVATIONS AS NEEDED. 9. CONSTRUCT STORMWATER OUTFALLS TO ALLOW FOR DISCHARGE FROM STORM VAULT EXCAVATIONS OF TESC STORM EVENTS. NORTH VAULT OUTFALL SHOULD BE CONSTRUCTED FIRST DUE TO LENGTH OF OUTFALL AND PROXIMITY TO SITE. 10. MAINTAIN EROSION CONTROL MEASURES IN ACCORDANCE WITH CITY OF RENTON EROSION AND SEDIMENT CONTROL STANDARDS. 11. RELOCATE SURFACE WATER CONTROLS AND EROSION CONTROL MEASURES OR INSTALL NEW MEASURES SO THAT AS SITE CONDITIONS CHANGE SO THAT THE EROSION AND SEDIMENT CONTROL IS ALWAYS IN ACCORDANCE WITH THE CITY OF RENTON EROSION AND SEDIMENT CONTROL STANDARDS. 12. COVER ALL AREAS THAT WILL BE UNWORKED FOR MORE THAN SEVEN DAYS DURING THE DRY SEASON OR TWO DAY DURING WET SEASON WITH STRAW, WOOD FIBER MULCH, COMPOST, PLASTIC SHEETING, OR EQUIVALENT. 13. STABILIZE ALL AREAS THAT REACH FINAL GRADE WITHIN 7 DAYS. 14. SEED OR SOD ANY AREAS TO REMAIN UNWORKED FOR MORE THAN 30 DAYS. UPON COMPLETION OF THE PROJECT, ALL DISTURBED AREAS MUST BE STABILIZED AND BEST MANAGEMENT PRACTICES REMOVED IF APPROPRIATE. 15. UPON COMPLETION OF THE PROJECT. ALL DISTURBED AREAS MUST BE STABILIZED AND BMP'S REMOVED, IF APPROPRIATE. ..fidmm� _ VERTICAL: NAVD 1988 HORIZONTAL: NAD 1983/1991 1 "=30' ONE INCH DATUM AT FULL SCALE IF NOT ONE INCH SCALE ACCORDINGLY Know what's below. Call before you dig. CITY OF RENTON Planning/Building/Public Works Dept. C z 0 5 10 20 30 SCALE 1 " = 30' FmOds"cla►T1m ® FILTER FABRIC PROTECTION TREE PROTECTION LIMITS OF CONSTRUCTION _X _X _X SILT FENCE APPROXIMATE CUT/FILL VOLUMES CUT. 2,093 C. Y. FILL: 6,211 C.Y. DISTURBANCE AREA AS SHOWN ON THIS SHEET 3.07 AC. ARBORIST IS TO BE PRESENT ON SITE DURING CONSTRUCTION OF THE SHARED DRIVEWAY, ASSOCIATED UTILITIES & THE PUBLIC STREET FRONTAGE. : 4 S AP GEOTECHNICAL RECOMMENDATIONS: SUBGRADE PREPARATION FOLLOWING SITE STRIPPING AND REMOVAL OF THE EXISTING STRUCTURAL IMPROVEMENTS, CUTS AND FILLS WILL BE COMPLETED TO ESTABLISH THE PROPOSED SUBGRADE LEVELS THROUGHOUT THE SITE. ESNW SHOULD OBSERVE THE SUBGRADE DURING THE INITIAL SITE PREPARATION ACTIVITIES TO CONFIRM SOIL CONDITIONS AND TO PROVIDE SUPPLEMENTAL RECOMMENDATIONS FOR SUBGRADE PREPARATION. I� iN ni rrrl.�t�� ►►�u�ys•I»� TEMPORARY SLOPES OVER FOUR FEET IN HEIGHT IN TYPE C SOILS SHOULD BE SLOPED NO STEEPER THAN 1.5H: 1V (HORIZONTAL: VERTICAL). DENSE NATIVE SOIL AND WHERE GROUNDWATER IS NOT EXPOSED WOULD BE CLASSIFIED BY OSHA/WISHA AS TYPE A. TEMPORARY SLOPES OVER FOUR FEET IN HEIGHT IN TYPE A SOILS SHOULD BE SLOPED NO STEEPER THAN 0.75H:1 V (HORIZONTAL: VERTICAL) ESNW SHOULD OBSERVE THE EXCAVATIONS TO CONFIRM TEMPORARY SLOPE INCLINATIONS ARE AA RECOMMENDED FOR THE EXPOSED SOIL TYPE. IF TEMPORARY SLOPES CANNOT BE CONSTRUCTED IN ACCORDANCE WITH OSHA/WISHA GUIDELINES, TEMPORARY SHORING MAY BE NECESSARY. PERMANENT SLOPES SHOULD MAINTAIN A GRADIENT OF 2H:1V, OR FLATTER, AND SHOULD BE PLANTED WITH AN APPROPRIATE SPECIES OF VEGETATION TO ENHANCE STABILITY AND MINIMIZE EROSION. THIS CONDITION APPLIES TO CONSTRUCTION OF THE DETENTION VAULT, WHICH IS LOCATED NEAR A PROPERTY LINE. DRAINAGE MINOR GROUNDWATER SEEPAGE SHOULD BE EXPECTED IN SITE EXCAVATIONS, ESPECIALLY AT THE CONTACT BETWEEN THE WEATHERED AND UNWEATHERED TILL SOILS. TEMPORARY MEASURES TO CONTROL SURFACE WATER RUNOFF AND GROUNDWATER DURING CONSTRUCTION WOULD LIKELY INVOLVE PASSIVE ELEMENTS SUCH AS INTERCEPTOR TRENCHES AND SUMPS. I� ►►ir ►ra.�r�yxrrrl►�� THE PERFORMANCE OF SITE PAVEMENTS IS LARGELY RELATED TO THE CONDITION OF THE UNDERLYING SUBGRADE. TO PROVIDE ADEQUATE PAVEMENT PERFORMANCE, THE SUBGRADE SHOULD BE IN A FIRM AND UNYIELDING CONDITION WHEN SUBJECTED TO PROOFROLLING WITH A LOADED DUMP TRUCK. IT IS POSSIBLE THAT SOFT, WET, OR OTHERWISE UNSUITABLE SUBGRADE AREAS MAY STILL EXIST AFTER BASE GRADING ACTIVITIES. AREAS OF UNSUITABLE OR YIELDING SUBGRADE CONDITIONS WILL REQUIRE REMEDIAL MEASURES SUCH AS OVEREXCAVATION, CEMENT TREATMENTS, PLACEMENT OF A GEOTEXTILE AND THICKER CRUSHED ROCK OR STRUCTURAL FILL SECTIONS PRIOR TO PAVEMENT. ►jr►rr��C�Il�lilir►►�UiI:7�►�1.1:1'l [.1:1y1i1 EXCESSIVELY LOOSE, ORGANIC, OR OTHERWISE UNSUITABLE SOILS ENCOUNTERED IN THE TRENCH EXCAVATIONS SHOULD NOT BE USED FOR SUPPORTING UTILITIES. IN GENERAL, THE ON -SITE SOILS OBSERVED AT THE TEST SITES SHOULD BE SUITABLE FOR USE AS STRUCTURAL BACKFILL IN THE UTILITY TRENCH EXCAVATION, PROVIDED THE SOIL IS AT OR NEAR THE OPTIMUM MOISTURE CONTENT AT THE TIME OF PLACEMENT AND COMPACTION. MOISTURE CONDITIONING OF THE SOIL MAY BE NECESSARY AT SOME LOCATIONS PRIOR TO USE AS STRUCTURAL FILL. UTILITY TRENCH BACKFILL SHOULD BE PLACED AND COMPACTED TO THE SPECIFICATION OF STRUCTURAL FILL PROVIDED IN THIS REPORT, OR TO THE C APPLICABLE SPECIFICATION OF THE CITY OF RENTON. R- 4 1 1 5 0 4 N 7 61 • 0- IN COMPLIANCE WITH CITY OF RENTON STANDARDS Q DEVELOPMENT ENGINEERINGIL Brianne Bannwarth 07/01/2021 `L SKYHORSE SHORT PLAT PR 17-000438 TESC PLAN O I C/� DATE: 1111212020 RELDBOOK: PAGE: O DRAWING NO: 1460.3 SHEET: OF. 4 19