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05D1830
HIGHLANDS AT COBBLE CREEK SE 299TH PL A PORTION OF THE SW 1/4 OF SECTION 5, TOWNSHIP 21 N., RANGE 5 E., W.M. AUBURN, WASHINGTON 1=50'L:.•.... :'.i DESCRIPTION LEGAL DESCR - - - - - - - - - _ _ _ N88'S8'3a''W s3 I Ex, R/w �_ __ 9.94 � I •� ►-!�- — -- -: - .-� — — ► !"� PORTION OF THE EAST HALF OF THE SOUTHEAST QUARTER OF THE SOUTHWEST f r = - - - - _ ''� THAT PO - _ QUARTER OF SECTION 5, TOWNSHIP 21 NORTH, RANGE 5 EAST, WILLAMETTE MERIDIAN, - - - - - - - - -. LYING NORTHERLY OF HAZELWOOD SCHOOL ROAD AS NOW LOCATED; i „ I EXCEPT THAT PORTION THEREOF PLATTED WITHIN HAZELWOOD HEIGHTS, AS PER PLAT ��,� .... ' 1 i , \y i' I • RECORDED IN VOLUME 71 OF PLATS, PAGE 37, RECORDS OF KING COUNTY; t 9 I f AND EXCEPT THAT PORTION THEREOF DESCRIBED AS FOLLOWS: / 1 1 ` I 4 �........ 0 TR. I f 1 BEGINNING AT THE SOUTHWEST CORNER OF THE ABOVE -DESCRIBED TRACT; t+ 5 1...�........ WETLAND ........ BUFFER <a. THENCE NORTH ALONG THE WEST LINE THEREOF 243 FEET; _ _ .. THENCE EASTERLY PARALLEL TO THE NORTH LINE OF SAID EAST HALF OF THE I I ,- -- -- -_ , .. -- ..... SOUTHEAST QUARTER OF THE SOUTHWEST QUARTER 252 FEET, MORE OR LESS, l0'"UE "$ TO THE NORTHWEST BOUNDARY OF THE HAZELWOOD SCHOOL ROAD; �`- ""00 THENCE SOUTHWESTERLY ALONG THE NORTHWESTERLY BOUNDARY OF SAID ROADSE 3IR9'• ...' TO THE POINT OF BEGINNING; s aa. •+ "+v';;. rwu«..ii ire; , .�.......�5.:�. ,...«...� a.:. ., .�,, .,. � � , < ,.Aft, z fry.. ...f .Y• ,ai, �.� i'�',� SITUATE IN THE COUNTY OF KING, STATE OF WASHINGTON. _ - �, DATUM EX. EDGE OF I -_�' '' -�-__ i�''••''%r - PAVEMENT (TYP.) - - �'•....... /''ram AVD 1988 �i.. _ _ T - __�_ _ ......... i .�': • �► s'' N EX. 50' RADIUS ��'-___�==''_`'= I,/j�,li��' �+ _� TEMPORARY TURN �=- --_= -,,. _.-:---_- .. - _- �i/tom ��.• — BENCHMARK AROUND EASEMENT -- - f t� CITY OF AUBURN BM NO. 34-N; FOUND RR SPIKE IN POWER POLE NO. X1933 AT SE CORNER OF INTERSECTION SE 304TH STREET AND 108TH AVENUE SE ELEVATION=322.77 FEET I i�ii� •w•'r`� "�� I ` 1 ' ���/ i�� / { �'`� fib• I GENERAL NOTES: 1. THIS DEVELOPMENT PROJECT SHALL CONFORM TO THE CITY OF AUBURN'S REQUIREMENTS AND BE IN _ _ ' _ =T ACCORDANCE WITH THE APPROVED PLANS. ANY CHANGES FROM THE APPROVED PLAN WILL REQUIRE - - - _ WE APPROVAL FROM THE OWNER, ENGINEER AND THE CITY. TR. H ...... 2. ALL WORKMANSHIP AND MATERIALS SHALL CONFORM TO THE "WASHINGTON STATE DEPARTMENT OF S0 TRANSPORTATION (WSDOT) STANDARD SPECIFICATIONS FOR ROAD, BRIDGE, AND MUNICIPAL CONSTRUCTION" EXISTING ROCKERY .....•......... " e �Z�9tyb 101/ STANDARDS2002 I MANUAL. EXCEPT COPIES THELEMENTED OR ABOVE DOCUMENTS MODIFIEDBY EEAVAILABLEOATTTHE JOON B SITE "" ""'• i T I DURING CONSTRUCTION. ... TRACT A 3. A PR.- ;ONSTRUCTION MEETING SHALL BE REQUIRED PRIOR TO THE START OF ALL CONSTRUCTION. CONTACT THE PUBLIC WORKS DEPARTMENT AT 253-931-3010 TO SCHEDULE A MEETING.' Lul 4. LOCATIONS SHOWN FOR EXISTING UTILITIES ARE APPROXIMATE. THE CONTRACTOR IS CAUTIONED THAT v .... .............. aw . OVERHEAD UTILITY LINES MAY NOT BE SHOWN ON THE DRAWINGS. IT SHALL BE THE CONTRACTORS ' RESPONSIBILITY TO DETERMINE THE TRUE ELEVATIONS AND LOCATIONS OF ALL UNDERGROUND UTILITIES UTILITY LINES. IDENTIFICATION LOCATION �i AND THE EXTENT OF ANY HAZARD CREATED BY OVERHEAD . .� � r MARKING AND RESPONSIBILITY FOR, UNDERGROUND FACILITIES OR UTILITIES, IS GOVERNED BY THE LJ • PROVISIONS OF CHAPTER 19.122 REVISED CODE OF WASHINGTON (RCW). PRIOR TO STARTING CONSTRUCTION, THE CONTRACTOR SHALL CALL ONE -CALL c) (1-800-424-5555) FOR UTILITY LOCATIONS �YJ � � '/ � WATER SANITARY SEWER STORM SEWER, GAS, POWER, TELEPHONE AND TELEVISION. f 5. PRIOR TO THE START OF CONSTRUCTION A PROPOSED ROUTE AND SCHEDULE FOR HAULING MATERIAL c TO THE SITE SHALL BE SUBMITTED TO THE CITY FOR APPROVAL. IF THE CITY BELIEVES THAT THE _ PROPOSED HAUL ROUTE WILL ADVERSELY IMPACT THE STREET NETWORK, HAULING MAY BE LIMITED C� ` 2 0 TO APPROPRIATE OFF-PEAK HOURS OR ALTERNATIVE ROUTES. ✓ \ 6. THE CONTRACTOR SHALL BE RESPONSIBLE FOR PUBLIC SAFETY ON AND AROUND THIS PROJECT. j a" / :r� / Cj \ �� ART OF WORK ALL METHODS AND EQUIPMENT USED FOR TRAFFIC CONTROL AND STREET ter' / W PRIOR TO THE ST ���/// MAINTENANCE SHALL BE SUBMITTED TO THE CITY FOR APPROVAL. CONTRACTORS AND THEIR SURETY _ - ' n• �,� i�' SHALL BE LIABLE FOR INJURIES AND DAMAGES TO PERSONS AND PROPERTY SUFFERED BECAUSE OF / ' \ c� (J- UTILITIES SERVICES WATER: CONTRACTORS OPERATIONS OR NEGLIGENCE CONNECTED WITH THEM. r �:.aif.. \ J / l 7. ALL CONSTRUCTION SURVEYING FOR EXTENSIONS OF PUBLIC FACILITIES SHALL BE DONE UNDER THE ~ / DIRECTION OF A WASHINGTON LICENSED LAND SURVEYOR OR A WASHINGTON LICENSED PROFESSIONAL / f CITY OF AUBURN CIVIL ENGINEER. TR. E PUBLIC WORKS ''^-•--� � � 25 WEST MAIN STREET 8. CERTIFIED DRAWINGS ARE REQUIRED PRIOR TO PROJECT ACCEPTANCE. REFER TO THE CITY'S "RECORD r - - - )- -_ - - - - L AUBURN, WA 91001 CONSTRUCTION DOCUMENT" HANDOUT. / " \ / (253) CONTACT: DAR0 / ARCIE HANSON CONSTRUCTION SEQUENCE: PER TREE EVALUATION AND PROTECTION PLAN PREPARED BY WASHINGTON FORESTRY CONSULTANTS, INC. ON 4-15-04. 1. HEAV LY FLAG THE PROPOSED CLEARING LIMITS 2. CONTACT WFCI TO RE-EVALUATE THE TREES AT THE BACKS OF LOTS (WITH GRADING PLAN IN HAND) AND MARK THOSE THAT CAN BE RETAINED (IF ANY). 3. WFCI SHOULD THEN EVALUATE ALL EDGE TREES IN THE OPEN SPACE AND MARK ALL TREES THAT WILL BE HAZARDOUS TO THE NEW HOMES. 4. CONDUCT A PRE -JOB CONFERENCE WITH THE CLEARING CONTRACTOR AND WFCI TO DISCUSS TREE PROTECTION ISSUES 5. COMPLETE LOGGING AND HAZARD TREE REMOVAL 6. COMPLETE GRUBBING AND CLEARING. 7. INSTALL ORANGE MESH TREE PROTECTION AT THE CRITICAL ROOT ZONE EDGE AS MARKED BY WFCI. 8. RETAIN ALL DESIRABLE UNDER STORY VEGETATION WITHIN THE CRITICAL ROOT ZONE OF SAVED TREES. 9. COMPLETE GRADING AND CONSTRUCTION. 10. MAINTAIN TREE PROTECTION FENCING THROUGHOUT CONSTRUCTION. 11. IF ANY TREE ISSUES ARISE DURING CONSTRUCTION, CONTACT WFCI PRIOR TO ANY ENCROACHMENT INTO THE ROOT PROTECTION ZONES OF PROTECTED TREES. 12. WFCI WILL THEN EVALUATE TREE AND SITUATION AND MAKE RECOMMENDATIONS FOR TREE PROTECTION OR REMOVAL. 13. CONTACT WFCI TO INSPECT ALL TREES AFTER CONSTRUCTION TO ENSURE THAT NO TRE' 'WERE MADE HAZARDOUS BY SITE WORK. LEGEND EXITING PROPOSED PROPERTY LINE LOT LINE CONTOUR LINE ............•••• ------ STORM SEWER LINE�- CATCH BASIN - TYPE 1 ❑ CATCH BASIN - TYPE 2 O O SANITARY SEWER LINE - — - MANHOLE O WATER LINE - _-_ WATER METER m FIRE HYDRANT ?F 0 330 1 sF g / SEWER: CITY 25 OESTAMAIN R IC WORKS STREET AUBURN, WA 98001 253 931-3010 4 d •. ) CONTACT: DARCIE HANSON r � If POWER: PUGET SOUND ENERGY/POTELCO 8001 SOUTH 212TH STREET KENT, WA 98032 CON TACT: 5LEE BROWN 151 1 GAS: ' PUGET SOUND ENERGY/POTELCO 8001 SOUTH 212TH STREET KENT, WA 98032 a (253) 395-7065 X 7151 ti CONTACT: LEE BROWN INDEX TO SHEETS SE 300TH ST SE 301ST ST cn SITE Q ��, Qv � ") 04--r--- W N SE 302ND ST �� o _ = o SE 303RD CT SE 302ND ST In zzz b m m m O� F- W J h aaa 00o W W m m SE 304TH ST U Lu a a CL m 3� Ilk��� >Q 0 U3 U L a � o r� aCaaa ofm Z Q V v VICINITY MAP - U UU �M- V KT.a mm \\ m Nrn� A ~ OWNER: Nr z AL AND PAT KOFAL 14740 N. WINDSHADE DRIVE TUCSON AZ 58737 J DEVELOPERcq O J DALE ALAN LAND DEVELOPMENT COMPANY, LLC co 12515 BEL RED ROAD, SUITE 201 BELLEVUE, WA 98005 O N PHONE: (425) 462-8200 ext. 229 U (0 FAX: (425)-462-7876 CONTACT: MURRAY KAHN _ Z O U-) In ENGINEER SURVEYOR W N o N BARGHAUSEN CONSULTING ENGINEERS, INC. 18215 72ND AVE S00 C) v KENT, WA 98032 O m PHONE: (425) 251-6222 J � Z CONTACT: ROBERT J. ARMSTRONG, PE W Q SITE ADDRESS: � j W W W < SE 304TH WAY AND SE 104TH ST AUBURN, WA 98002 Q I, D � � Z m J U-)W D � Z r m Q Q W TELEPHONE: Q U QWEST COMMUNICATIONS Q 23315 66TH AVENUE SOUTH KENT, WA 98032 (206)372-5388 CONTACT: JENNIFER GORMAN_ N CABLE: COMCAST CABLE COMMUNICATIONS ° z s' m 4020 AUBURN WAY N N AUBURN, WA 98002 = N (253) 288-7538 CONTACT: BILL WALKER Q O ~ I FIRE: Ln KING COUNTY FIRE PROTECTION DISTRICT #44+ 32316 148TH AVE SE AUBURN, WA 98092 °' ; 0 (253) 735-0284 CONTACT: BARBARA SHELL a u X SCHOOL AUBURN SCHOOL DISTRICT #408 915 4TH STREET NE AUBURN, WA 98002 (253) 931-4930 0 CONTACT: MIKE NEWMAN 2OFT____ -3` IDF CLEARING. GRADING AND TESL PLAN _ 7 SITE PLAN- 4 OF 7 ROAD AND STORM DRAINAGE PLAN/PROFILE 5 OF 7 DETENTION PIPE PLAN, SECTIONS AND DETAILS 6 OF 7 WATER AND SEWER PLAN/PROFILE 7 OF 7 SITE CROSS SECTIONS, WATERMAIN EXTENSION CONTINUATION AND DETAILS WETLAND PLANS PREPARED BY AIderNW 1-6F 2 BUFFER ' R SHEET - -BF 2 BUFFER EXPIRES 2 5 06 = C7 U GEOTECHNICAL REPORTS: J 0 ALL EARTHWORK SHALL BE DONE IN ACCORDANCE WITH TERRA w z CD ASSOCIATES INC. GEOTECHNICAL REPORT DATED MARCH 19 2004 AND ANY SUBSEQUENT REPORTS AND FIELp DIRECTION. CONTRACTOR z w Q �ui z g SHALL OBTAIN AVAILABLE REPORTS AND KEEP ON SITE WITH THE > i j zo APPROVED PLANS. Q N N U� N WETLAND RESTORATION REPORT: O N (D co c Z N I ( w ALL WORK WITHIN THE WETLAND/WETLAND BUFFERSHALL BE DONE IN ACCORDANCE WITH ALDERNW WETLAND RESTORATION REPORT DATED � � j w z APR 14 22004 AND ANY SUBSEQUENT REPORTS AND FIELD DIRECTION. N N z - E CONTRACtOR SHALL OBTAIN AVAILABLE REPORTS AND KEEP ON SITE �.-. w WITH THE APPROVED PLANS. NZ N N J> t, 00 LA J S N Q � � z W •� RECORD DRAWING CERTIFICATION PROJECT REF,• FAC04-UU14 b,� CoN51 h THESE DRAWINGS CONFORM TO THE THESE PLANS ARE APPROVED FOR r CONTRACT S C TRUCTI CORDS. CONFORMANCE WITH THE CITY OF AUBURN'S N . ENGINEERING DMSION REQUIREMENTS. 0 �, jz 2a oil O BY T lLIM �J z d TITLE/POSITION- �/ APPROVED BY- o � -0 r u- CONFIRMED BY CITYA40 DATE: 1Z DATE APPROVED: 12,1 Z-5/04 CLEARING, GRADING AND TESC PLAN OF HIGHLANDS AT CREEK LIMITS OF CLEARING A PORTION OF THE SW 1/4 OFSECTION 5, TOWNSHIP 21 N., RANGE 5 E., W.M. .�=50 AT NORTH PROPERTY AUBURN, WASHINGTON BOUNDARY • �� " `, SILT CONTROL FENCE ...... n ;�� (PER COA DETAIL - EROSION 02)air f --—— — — — — —— _-_----- _ LIMITS F C FARING /'� ./././' -..... I:- �- I 12 EAST OF f......... `:` ```�'•• • ' i PROPERTY BOUNDARY //// i I ". F m LINE EASEMENT / ALONG NORTH SIDS'• :' � I • SWALE TO BE C. .. 0 / / / L. OF I UPON INST .... OF 71 REM R OCATE ............... "........ ... ..UNTIL HOMES \ �� I I S FORIWI AND BE A#AI�IT#4ik \ EX. MAILBOX I .... \t. �.......................... ARE C I LIMITS OF CLEARING SILT CONTROL FENCE (PER COA DETAIL - EROSION 02) TEMP. Y DTTCH -- ...+- CHECK DAM CATCH BASIN 14Z PROTECTION (TYP NOT `� S• 1. CLEARED GROUND TO BE COVERED WITH THE APPROPRIATE MULCHING/HYDROSEEDING AS NECESSARY TO CORRESPOND TO THE CITY OF AUBURN'S STANDARDS FOR SLOPE AND GROUND COVERING 2. CONTRACTOR SHALL INSTALL STRAW BALES AT THE TEMPORARY LEVEL. SPREADER OUTFALL FOR TESL AND ENERGY DISSIPATION IN ADDITION TO THE DOUBLE SILT FENCE IF DEEMED NECESSARY BY THE CITY OF AUBURN INSPECTOR. ' --- ��............ i ...... SILT O>'TTR(OL PENCE \�� ► i `� I / CONSTRUCTION E PROTE IN INLET - CATCH PER COA..DETAIL (PER COA DET ) 01.. 02) ----- �- -N-- ------ ..: 'CHECK S... MITS OF C SE 3QE1 - i t; f ............... RADING AND EROSION CONTROL NOTES: 1. WITHIN THE CITY AUBURN, ALL REQUIRED SEDIMENTATION AND EROSION CONTROL FACILITIES INDICATED ON THE PLANS MUST BE CONSTRUCTED AND IN OPERATION, PRIOR TO LAND CLEARING AND/OR OTHER CONSTRUCTION ACTIVITIES. THESE FACILITIES SIAL BE MAINTAINED, AND UPGRADED IF NECESSARY, TO INSURE THAT SEDIMENT -LADEN WATER AND STM LINAGE RUNOFF DOES NOT IMPACT THE ADJACENT PROPERTIES, NATURAL DRAINAGE WAYS, OR THE EXISTING CITY STORM DRAINAGE SYSTEM. 2. THE SOURCES FOR ALL MATERIAL IMPORTED TO THE SITE SHALL BE APPROVED BY THE CITY. 3. THE DETENTION (RETENTION IF INFILTRATION SYSTEM IS USED), SEDIMENTATION AND EROSION CONTROL FACILITIES DEPICTED ON THE APPROVED DRAWINGS ARE INTENDED TO BE MINIMUM REQUIREMENTS TO MEET ANTICIPATED SITE CONDITIONS, ADDITIONAL. DRAINS AND EROSION CONTROL FACILITIES MAY BE REQUIRED AS SITUATIONS WARRANT DURING CONSTRUCTION. THE IMPLEMENTATION, MAINTENANCE, REPLACEMENT AND ADDITIONS TO THESE CONTROL SYSTEMS SHALL BE THE RESPONSIBILITY OF THE PERMITTEE. 4. THE TEMPORARY EROSION CONTROL FACILITIES, INCLUDING ALL PERIMETER CONTROLS AND THE DETENTION (RETENTION IF INFILTRATION SYSTEMS IS USED) CONTROL PONDS, SHALL REMAIN IN PLACE UNTIL FINAL SITE CONSTRUCTION IS COMPLETED AND APPROVAL FOR THEIR REMOVAL HAS BEEN RECEIVED FROM THE CITY. 5. THE CONTRACTOR WILL BE REQUIRED TO WATER THE SITE, AS NECESSARY TO REDUCE DUST EMISSIONS AS A RESULT OF CONSTRUCTION ACTIVITY. THE CONTRACTOR SHALL ALSO SWEEP ALL AFFECTED PUB IC ROADS, AS NECK, TO REMOVE MUD DEPOSITED AS A RESULT OF PROJECT CONSTRUCTION ACTIVITY. 6. ALL AREAS OF ACTIVE EARTHWORK WHICH HAVE THE POTENTIAL FOR EROSION AND SEDIMENTATION IMPACTS ON ADJACENT PROPERTIES, NATURAL DRAB "E WAYS, OR THE EXISTING CITY STORM DRAINAGE SYSTEM MUST BE STABILIZED ACCORDING TO THE FOLLOWINIG SCHEDULE: FROM APRIL 1 TO SEPTEMBER 30, AREAS AT FINAL GRADE AND THOSE THAT ARE SCHEDULED TO REMAIN UNWORKED FOR MORE THAN THIRTY DAYS SHALL BE STABILIZED WITHIN TEN DAYS. FROM OCTOBER 1 TO MARCH 31, EARTHWORK ACTIVITIES SHALL BE CONDUCTED IN STAGES IN ORDER TO MINIMIZE SOIL EXPOSURE. EXPOSED SOILS WITH AN AREA GREATER THAN 5,000 SQUARE FEET THAT ARE SCHEDULED TO REMAIN UNWORKED FOR MORE THAN 24 HOURS AND EXPOSED AREAS OF LESS THAN 5,000 SQUARE FAT THAT WILL REMAIN UNWORKED FOR MORE THAN SEVEN DAYS SHALL BE STABILIZED IMMEDIATELY. 18' MIN. REBAR SUPPORT 30, AT 8" MIN. SPACING 6" PERF PIPE 2"x12" CONCRETE GRADE A LAID FLAT BOARD (SEE DETAIL BELOW) ° CLEANOUT WYE y' FROM PIPE �,.,::.,� ',...�. •'�;.� . T: I ,• O PIPE O.D. END CAP r `, b.. _ :•ti: :' , .' ;' 4 ` , `' o OR PLUG •`: :ti t q 12" INLET PIPE CB -TYPE I W/LOCKING LID PLAN VEW ZV�------"-' t ts* "1 ar A.r.w'= II II II II II II II II II IJ III II OTM _ — I I —III -I =1 I I� I I, ;III_ i .� �•;��., '.� r �• ;, .,-�x=..,.x 1. THIS TRENCH SHALL BE III "�,,:, �••`'+�' ' FILTER FABRIC CONSTRUCTED SO AS TO GALV. BOLTSy}y j tit _ 'M• a PREVENT POINT DISCHARGE AND/OR EROSION. 2"x12 CONNI GRADE S >�R ,,.* • 2. TRENCHES MAY BE PLACED BOARD (SEE DETAIL BELOW) ;r`,i~``�;Y%« ---------------- NO CLOSER THAN 50 FEET 18' MIN. REBAR SUPPORT,---*' 12" INLET PIPE TO ONE ANOTHER. AT 8" MIN. SPACING -•:•e' -,^ :rs;- ---------------- 3. TRENCH AND GRADE BOARD ,,�• � - MUST BE LEVEL ALIGN TO 6" PERF. PIPE }r• "•z Via, .E CLEAN (S 5% FINES) FOLLOW CONTOURS OFF SITE. LAID FLAT W/HOLES , ` *'"' 3/4"-1 1/2 WASHED ROCK BEC: LION 'A -A' 6H•.0 MIN f•4 5. �1 " MIN. °A A o LIMITS OF CLEARING _- ---- ��`�i��/� //: ��✓:.- -_ — AT WEST PROPERTY BOUNDARY '7- --_--- `---2-- -- ....... I EX. EDGE OF PAVEMENT I I , I 11• {OFFSITE LIMITS OF CLEARING SHALL BE AS MINIMAL AS POSSIBLE ALONG THE WATERLNN ALIGNMENT TO INSTALL THE WATERLNNN AND PRV STATION �-- 23 LF TEMPORARY 12" PVC PIPE. CONTRACTOR TO INSTALL CULVERT IF UkTERLINE CONSTRUCTION TO TAKE PLACE DUlW RAINY SEASON. CULVERT - - - - - - - - - - - MAY NOT BE NECESSARY IF VIIATERLINE CONSTRUCTED DURING SUMMER. SEE WETLAND STREAM RESTORATION PLAN BY ALDER NW. I� 4. / PERMANENT. �T N DRAINAGE ` TANK WITHIN TRACT B i TEMPORARY DITCH W/ CHECK DAMS M ry I BUFFER _ - - /' �. ' MrTMS OFc EA TIN , °, ' TRACT A EXISTIC ROOKERY .. ' B .ILT�QFENCE... ," v PER -. ..... • • DT.O. D2-TM LJ ............ 0 t�{ENTT DDECP�IOYNSITION � \ II ERC '- PERMANENT... LEVEL SPREADER,( D uZl Ir) FLAGGE uMITS OF WETLAND AS �) BY ALDER NORTHWEST AND LI CONSURVEYED LEl'TDBY NG ENGINEERING,BN `^ \ i INC. � L J .....r L�—————— — — — --- to Ld -) MAXIMUM SLOPE GRADIENT: 2:1(H:V) - '" • ................ SPECIAL NOTE: LIMITS OF CLEARING SHOWN ON EROSION CONTROL PLAN ARE APPROXIMATE. ARBORIST TO DETERMINE ACTUAL LIMITS OF CLEARING PRIOR TO CONSTRUCTION. ONSITE CUT ONSITE FILL ONSITE STRIPPING STOCKPILE AND PLACE ON LOTS EX. SD PIPE UNDER 106TH AVE. SE •I " N........ I \ 1 V. EX44\ I / N \ I I AV I L. / 2"x12" CONCRETE GRADEJA III- I L BOARD ° _ _ _ _ — I p —I =III 1l1-1 HI1 111—III 1 —I III 111=1II I —I I; i I -- -I I I I I 1=1 I -1 I 11—_ �- -1 I I I —III III —I I =1 I— —III III —I I—ITI I I I i I —I I —I! � 18" MIN. REBAR SUPPORTS Y AT 8" MIN. SPACING I 'r- r- h 1 111 `�-1 Ff-^Ir•',%r-I /1 I � i :n•)V11L. f I I/1L. V..:L I -7,332 CY = 9,911 CY =3,321 CY woo J. AIR V W S ,toy EXPIRES 2 5 06 NOTE: 1. REFER TO GEOTECHNK:IL. REPORT BY TERRA ASSOCIATES, INC. DATED MARCH 19, 2004 FOR FILL SLOPE CONSTRUCTION SPECIFICATIONS. 2. CONTRACTOR TO STOCKPILE MATERIAL REMOVED FROM WETLAND DURING WATERLINE CONSTRUCTION FOR USE IN BACKFILL:ING WETLAND UPON COMPLETION OF CONSTRUCTION OF WATERLINE. 3. REFER TO CONSTRUCTION SEQUENCE ON SHEET 1 FOR DETERMINATION OF LIMITS OF CLEARING. SLOPE TO DRAIN NEW STRUCTURAL ALL --` KEY CUT AND TOE DRAIN — 4" DIAMETER PERFORATED PIPE ENVELOPED IN 1 cu.ft. 3/4" DRAINAGE GRAVEL NOT TO SCALE 1. SLOPE SHOULD BE STRIPPED OF TOPSOIL AND UNSUITABLE SOILS PRIOR TO PLACING ANY FILL 2. "KEY" SHOULD BE MINIMUM 2 FEET DEEP AND 8 FEET WIDE, E MI)ING THE FULL LENGTH OF THE SLOPE FACE. 3. FINAL. SLOPE FACE SHOULD BE DENSIFIED BY COMPACTION. 4. PLANT OR HYDROSEED SLOPE FACE TO REDUCE EROSION POTENTIAL. 5. ALL STRUCTURAL FILL FOR SLOPE AREAS SHOULD BE COMPACTED TO 95% OF SOILS MAXIMUM DRY DENSITY PER ASTM D-698 (STANDARD PROCTOR). t :Tef Ta SLOPE FILL DETAIL y '+ HIGHLANDS AT COBBLE CREEK Associates t Inc. AUBURN, WASHINGTON Ck7R$t11i nu in ICON C� WA PrOj, No. T-5507 Date MAR 2004 Figure 3 C0/WAIII4I11" or c (- f�7�i• -T w k4= ff LYE (Z MIX meg ci Pc ui a� 00 c � ac •- chi SkMN� 2 r9 W P z �� 0 0 LLj z LAJ j � cV PO N 0 0 z z m to 00 w LAJ 01 % LJ lot v V v-- Y I W) h = N N NOT TO TO SCALE AAd& r �, Lm U f'` NOTES 1. TAX #: 0521059014 2. SITE AREA: 9.20 AC. 3. EXISTING USE: FOREST 4. PROPOSED USE: 6 LOT SUBDIVISION 5. EXISTING ZONING: LHR1 6• PROPOSED ZONING: LHR1 7. EXISTING COMPREHENSIVE PLAN DESIGNATION: SINGLE FAMILY 4 UNITS/AC 8. PROPOSED COMPREHENSIVE PLAN DESIGNATION: SINGLE FAMILY 4 UNITS/AC 9. PROPOSED MIN. LOT WIDTH: 80' 10. PROPOSED MIN. LOT AREA: 10,000 S.F. 11. AVERAGE LOT SIZE: 17,635 S.F. 12. PROJECT DENSITY: 0.65 DU/AC 13. REQUIRED MIN. SETBACKS: FRONT: 25' SIDE: 5' AND 10' REAR: 25' 14. MAX HEIGHT OF BUILDINGS: 30' 15. SOURCE OF BOUNDARY : BARGHAUSEN CONSULTING ENGINEERS, INC. 16. SOURCE OF TOPOGRAPHY : BARGHAUSEN CONSULTING ENGINEERS, INC. LOT AREA TABLE LOT # AREA (S.F.) 1 19572 2 11820 3 10413 4 12963 5 12275 6 16599 TRACT TABLE TRACT USE AREA (S.F.) A OPEN SPACE 279,412 B PRIVATE ACCESS TRACT 6,112 C OPEN SPACE/LOT 6/REC. TRACT 10,458 D OPEN SPACE/LOT 5/REC. TRACT 15,807 E OPEN SPACE TRACT TO LOT 41 332 OF THE PLAT OF COBBLE CREEK F OPEN SPACE TRACT TO LOT 32 1,128 OF THE PLAT OF COBBLE CREEK G OPEN SPACE TRACT TO LOT 31 1,080 OF THE PLAT OF COBBLE CREEK H OPEN SPACE TRACT TO LOT 30 1,141 OF THE PLAT OF COBBLE CREEK I OPEN SPACE TRACT TO LOT 20 1,536 OF THE PLAT OF COBBLE CREEK TOTAL TRACT AREA = 317.006 SITE PLAN OF HIGHLANDS AT COBBLE CREEK A PORTION OF THE SW 1/4 OF SECTION 5, TOWNSHIP 21 N., RANGE 5 E., W.M. AUBURN, WASHINGTON G a r r r I1 " i N88' , \ ; PAVEMENT ( ) - - - �0 639<.94 � � -_ � . �� ��� � f' 1 EX. EDGE OTYP. it : �2- --- -- -- w m ----- --- I f � � — — _ ............ ._.-- }--�-. . — — — — — —_ — _ — —, ,.ate-�•-•-.• — �-� --- - f.,,.Jl -' y- J I 0/v';: .,...._ - ,..r``"r ...--~""... i �..._.....' r.... ......_.„ r� I' l �i-------- -- — ------451 w _--------6 i O O ///iJ/ r ✓ 13--- 1�- f �t'.'-�,«.i' � •.:. ."``' � r"-10' SIO_ _— . ' . i SAWCUT EX. PAVEMENT ! lI 1- SCE 'I PER COA DETAIL GEPT-1 L Ir� i� 1` . I / / .-- _-- i PAD EL=2,�,� 0•-- ' ��"" z .. .�.« ✓�f PA � ��� .. I I PAD- EL=2M1:b 4t� 50 1 "atOo �T�v Tpw -�. I,. _-_ �.Of �� ��t /BEUTL_Ji D o I-f �L"� `!-�~ _. m THIC1£D ASPRALT E �.. I m r. _r ' � '� � EJ=ER c�� \\ {, ` , ft t',1 1 Sff5'33' 4"W w:3;f N aw 25' FONT 1'1'151 S11'22'25'W - - - - - - ....... �a / 09' `3 5.4T i -- -! � 50'W------------ �. !lf.0t1' 10' SAWCUT EX. PAVEMENT ' ,`.: ~ � I ~~=Z ;; --�; ' L=Ts's�3` =2�43'4s• ` ;_..... PER COA DETAIL GEPT-2 ~ / . ;• ' PAD EL 1 T..l, ti ='e , '+J / EX. EDGE OF PAVEMENT (TYP.)-=-i�6 _-=`-- 22 - it - - - .- ✓ `/`/�%j`fi 4�_ TANS 1b8t EX. 50 RADIUS TEMPORARY .294 56814" =2TURN AROUND EASEMENT /r —/ TNV=14.72 ....-~ .r ✓� '` � PAD ELF 32'48'35` #i # `yy SMS - - -{ - - - - - - - - - - �- _ _ -2 48_ - �li� L=41 18 / ci -"= — % �/� ~ -T1W=21.$4` ✓, ' f` oh OF 14'50 _ _ - n.-- � =4r 7" � ~« { TR. H aLy EXISTING ROCKERY ~ " X, s... __.._......... \ ' TRACT ALu \ L,j LU J (T] c4 rr� �J ITC C � ' (nJ TR. G L� — — — — — — — — — — — — TR. F �J L1_\ b i �� a L TR. E / / J* A I / O _ ,n L-15,60` Ln o TAWl T87 �.� \ \ '(_j rr ` e �i / bo 6=1757 4$ U Nvc l {` / 1 ' r ` w � s+' ;• ©C. SD PIPE UNDER 106TH AVE. SE / . { ;J l� r{ { FJ t � f` �� '� � /� nt I� j J l� � � � ; { } 3 � f t � � } a f � r' �4 � r � ' j II ! f' f i •f- t , I X+ � � •� � I � � _ _ .,.... � ,f i � f / / ._..- .--� / ! ! t' !� f � g F l e '� i ��� � i � �' L �—� I �• EX= 48 I I N41 12 .34. 115= i , f j/// l ` p ' •,° fat ��,� \ \ SE 304TH WAY \ f' i ,�S88'�8' 0 1�- � .: � � �• I ' ' f �°•' K A / I f r; ;#'-1� A,l l I J� � �� x fr1 K : I EA r- 3Ir�_L /'l VIILy-W'I1L_ I w to Z I I I I I I ARM WASy 'P 26016 o�Fss 0/STE�'�G\��� AL EXPIRES 2 5 06 I 1 6 NOTES PSDE = STORM DRAINAGE EASEMENT WLE = WATER LINE EASEMENT SDE = STORM DRAIN EASEMENT SSLE = SANITARY SEWER LINE EASEMENT UE = UTILITY EASEMENT FOR ALL UTILITIES PUBLIC AND PRIVATE INCLUDING DRAINAGE, WATER, SEWER, POWER, GAS, PHONE AND CABLE TV. BSBL = BUILDING SETBACK LINE RECORD DRAWING CERTIFICATION THESE DRAWINGS CONFORM TO THE CONTRAC S NSTRUCTIOI� RECORDS. BY IF LbATE-2L—d� TITLE/POS/T/OIV• CONFIRMED BY CITY1,>x) DATE• W W� 25 C 2 of cr� Ir m mm Q QQ 000 Q U uv v_ A mmm a as W w ww crc C w QaQ n �7) Q t Q U UU Y U b�� U UU m Q U 00 Z �-MN PROJECT REF,• FAC04-0014 THESE PLANS ARE APPROVED FOR CONFORMANCE WITH THE CITY OF AUBURN'S ENGINEERING DMSION R£OU/REMENTS r P I t/tL/o APPROVED BY - DATE APPROVED. 3 J O J OD O N U � Z O W) Lf) O q o W W azl 3: W w p J > >- Z m W cr Q In J F) W D z N m J .. U Q ~' W J Z Q O LEp U 6 U 0 Q C all m z to Q 0 U V C c Y O v V) Ld Z O V) LLI J Z X Q Z w w Q N gZ U tr O N 00 Z N p) W 00 w Lo Lo Z ca Z Lo �-Lo �� L0 wL r > Y U En W) h E *� N16 z t 0 � PF 4 335 S�fEET 3 of I 04TD/930 A55U/Lr - GRADING AND STORM DRAINAGE PLAN/PROFILE DISCHARGE INTERCEPTOR OPTIMAL- INTERCEPTOR TRENCH Dill DRAIN LINE. SEE DETAIL AND NOTE IE=254.00± THIS SHEET r 2 N ero C) z.� -------- 80 0 �` .... ���----------- --- ---------- ------ 28A .... ---------------------- .... 80 2--------------------- _____---22 ------ ----- _---- --- _-- .... _............ ....... �•• __ - '�•/ �� l/� // ice!/ :i ..p-��,-... •- — ------------- / .i �/ - -- -.—ire --�-- —__ --- _— — — — — —— ----- " ___-- / , / / ;_ ..-..--------------- --- ---------- --- ___-------- If If TR. I / / / If If / / I I... I I. . . / / / /......................I I ` S I I //, i/ .,... /.......... I , - `J / ; / 4 i 1 3 2 • I I If ; ........... PA......... EL-265.0 , t S EL-263.0 ; PAD EL=261.0 4• z` / r 27 /l l l ge, I L. .. \ �\� \ \\ 6.5'xB'z1' THICK: / H i I 1 \ \ \ \\ \ RIP-RAb P8 .ROCKS / I ... I PAD EL- 1.0: \: \\ \\ `\ \� USIN.9 Q // ...... I I I I ........... t............... ST TIIIG If If ...I .............. L CATCH BASIN ........ RC}F/fl0 / / • I I..................... '. / ..•)� 11 / ROOFI IE If =2 .0 I ST FILTER SEE SHEET.. 5....... : / / / 50 _, .........•..............�.....=...2... 5.8.. 0 DRAINLINE (TYP.) i=260.0 ITN ST . , / . I / Y E w 8 I ..-WOOD FENCE ALONG i t 13 71 : WETLAND. BUFFER 10 / I PAD EL-23.0 WE ELYN. WETLAND 0 LOCATED. -FEET AL EL2*.0 ' % // ���i _____ _. .. ..INMAN ... ......... 7' 7. ,�--------- �j��-------- "f---.--.-.-.---------�24-0 ------.%7.�/',�/''�% LIt 3'11FILL ... �� ' t�'•CX`• r,r DETEmN TANK ' 6 / SEE SIiEET..5 / N. PAD EL=255.0 PAD EL A. I \ I ROOF/FOOTING 01 ROOF/FOOTING.- i \\ DRAIN.... •' I DRAIN / ------ i/. - - - --2&2 - - - - - - { THICKENED ASPHALT EDGE — i i r' 2:1 FILL SLOPE. SEE' DETAI - - - - - - - ----- ----- --- ----- --/�/' �' ON SHEET 2. .... Y&tAND AS DELINEATED -- ----- --It, - ----------- �/� , / •�• LBY IMITS of NW AND SURVEYED ROOF/FOOTING DRAIN LINE. (SEE PLANS) 4"-8" SPALLS F lP—RAP PAD DETAIL NOT TO SCALE TABLE 4.2.2A ROCK PROTECTION AT OUTFALLS (1998 KING COUNTY SURFACE WATER DESIGN MANUAL) DISCHARGE VELOCITY AT DESIGN FLOWS (fps) REQUIRED PROTECTION GREATER LESS THAN MINIMUM DIMENSIONS THAN OR EQUAL TO TYPE THICKNESS WIDTH LENGTH HEIGHT 0 5 ROCK LINK • 1 ft. DIAMETER 8 fL CROWN + 6 ft. OR 4X dla., + 1 ft WHICHEVER IS GREATER 5 10 RIP RAP** 2 ft. DIAMETER 12 ft. CROWN + 6 ft. OR 4X dia. + 1 ft. OR 3X dia., WHICHEVER IS WHICHEVER IS GREATER GREATER 10 20 GABION OUTFALL (AS REQUIRED) (AS REQUIRED) (AS REQUIRED) + 1 ft. 20 N/A ENGINEERED ENERGY DISSIPATOR REQUIRED * ROCK LINING SHALL BE IN ACCORDANCE WITH SECTION 9-13.10F HE WSDOT/APWA STANDARD SPECIFICATIONS. ROCK LINING TO BE REASONABLY WELL GRADED WITH ROCK GRADATION AS FOLLOWS: PASSING 8" SQUARE SIEVE 10OX OR MAXIMUM STONE SIZE 8" PASSING 6" SQUARE STEW 40—BOX OR MEDIUM STONE SIZE 6" PASSING 2' SQUARE SIEVE 0-10X OR MINIMUM STONE SIZE 2" RIP RAP TO BE REASONABLY WELL GRADED WITH ROCK GRADATION AS FOLLOWS: MAXIIMUM STONE SIZE 24' (FINAL DIAMETER) MEDIUM STONE SIZE 16" MINIM STONE SIZE 4" NOTE: RIP RAP SIZING GOVERNED BY SIDE SLOES ON OUTLET CHANNEL, ASSUMED TO BE APPROXIMATELY 3:1 1. ROOF,FOOTING DRAINS AND DEAR YARDS FOR LOTS 1 5 AND 6 WILL BYPASS DETENTION AND DISCHARGE OUTSIDE OF WETLAND BUFFER ONTO CONSTRUCTED 6'x6'x6" THICK RIP -RAP PADS, ULTIMATELY DRAINING INTO COBBLE CREEK. 2. FOUNDATIONS THAT ARE ADJACENT TO SLOPES SHOULD BE DEEPENED TO PROVIDE A MINIMUM HORIZONTAL DISTANCE OF TEN FEET BETWEEN THE EDGE OF THE FOUNDATION FOOTING AND SLOPE FACE. PER GEOTECHNICAL REPORT PREPARED BY TERRA ASSOCIATES DATED MARCH 19, 2004. 3. INTERCEPTOR TRENCH DRAIN ALONG NORTH SITE BOUNDARY IS OPTIONAL BASED ON SITE CONDITIONS OBSERVED BY THE GEOTECHNICAL ENGINEER DURING CONSTRUCTION. 4. DETENTION TANK SHALL BE INSTALLED PER RECOMMENDATION BY TERRA ASSOCIATES, INC. REPORT DATED AUGUST 10TH, 2004 FOUND IN SECTION 7.5 OF THE DRAINAGE REPORT 24' TRACT 20' PAVEMENT 3' "-2* CLASS 'B' ASPHALT CONCRETE 4" ASPHALT TREATED BASE (ATB) JALTERNATIVE CLASS 'E' ASPHALT . H so# sEN CONSULTING IIGINEERs, INC.HIGHLANDS PLACE CROSS SECTION (PRIVATE ROAD LOOKING EAST) 6:5'z80x1THICK RIP-RAP PADTYP ) USING 4 -8" RtiCKS PER DETAIL THISCEIS 1. TYPE SHT. I j1pn.9% N: E: 9462. •°# IE (15- IN N) 23 I, aIo 6 a pVc Ir t w 2 31.'75 `6.5')M x1' THICK RIP-RAPPAD (TYP.) r USING 4" -8 ROCKS t50' LII VVL Sfegoa I G* t''S►z • o S iiT Z sae oe AL / NOT TO SCALE 8" HYDROSEED DISTU AREA NOT TO SCALE I EXPIRES 2 5 06 o a4TF 4"zz' °S PI 'CT REM FA 004-0014 Pn N- mm IL N% Zl- A r�� vw ll�! coy A z Z N ISTANDARD GAL STEEL LADDER 18 "x 18"x 18" PVC — TEE RUBBER GASKET JOINTS (REMOVABLE) 2.S2.4 1 PIPE SUPPORTS 36" CMP FROM TANK a ,1 P LAN VI EW WITH LOCKING BOLTS AS- BUILT - DETENTION TANK PLAN, NOTES AND DETAILS OF HIGHLANDS AT COBBLE CREEK 4 LF 8" DI 1 1.3.71 % 1p Zip 246 240 238 236 Or 252 (SEE NOTE 5) 2-CART. CATCHBASIN - PLAN VIEW 1 SCALE. N.T.S. 1 ACCESS COVER (TYP) CONCRETE COLLAR (SEE NOTE 6) UNDERDRAIN MANIFOLD INLET 4" 0 OPENING 6" • f (TYP) 2' 2'-8" 2' INSIDE INSdDE INSIDE CLEANOUT 8" 0 OUTLET PIPE ACCESS PLUG 6,-9" (SEE NOTE 5) OUTSIDE 2—CART. CATCHBASIN — SECTION VIEW A —A SCALE. N.T.S. 1 6" OVERLAP I•~ YP) 4" 0 OPENING PERMANENT POOL _T ELEVATION 1 -'I INLET STUB (OPTIONAL) STORMFILTER CARTRIDGE (TYP) 5 1 /4" 1' 5" 5 2'-3 5/8" 8" 0 OUTLET STUB (SEE NOTE 5) 2" 0 OUTLET PIPE FROM UNDERDRAIN 2-CART. CATCHBASIN - SECTION VIEW - SCALE. N.T.S. GENERAL NOTES 1.) STORMFILTER BY STORMWATER MANAGEMENT INC., PORTLAND, OREGON 800/548-4667. 2.) FILTERS TO BE SIPHON -ACTUATED AND SELF-CLEANIN-G. 3.) STEEL STRUCTURE TO BE MANUFACTURED OF V STEEL PLATE. 4.) STORMFILTER REQUIRES 2.3' OF DROP FROM RIM TO OUTLET. INLET (IF APPLICABLE) AND OUTLET PIPING TO BE SPECIFIED BY ENGINEER AND PROVIDED BY CONTRACTOR. 5.) CBSF EQUIPPED WITH 4" LONG STUBS FOR INLET (IF APPLICABLE) AND OUTLET PIPING. STANDARD OUTLET STUB IS 8" IN DIAMETER. CONNECTION TO COLLECTION PIPING CAN BE MADE USING FLEXIBLE COUPLING BY CONTRACTOR. 6.) FOR H-20 LOAD RATING, CONCRETE COLLAR IS REQUIRED. CONCRETE COLLAR WITH QUANTITY (2) #4 REINFORCING BARS TO BE PROVIDED BY CONTRACTOR. 7.) ALL STORMFILTERS REQUIRE REGULAR MAINTENANCE. REFER TO OPERATION AND MAINTENANCE GUIDELINES FOR DETAILS. 8.) STANDARD DETAIL SHOWS MAXIMUM NUMBER OF CARTRIDGES. EXACT NUMBER REQUIRED TO BE SPECIFIED ON SITE PLANS. SPECIAL NOTES PER GEOTECHNICAL REPORT BY TERRA ASSOCIATES, INC. DATED MARCH 19, 2004. LIFTING EYE (TYP OF 4) CARTRID SUPPO o I Ii1������9L�' • .s s INSIDE � N 2-CART. CATCHBASIN - SECTION VIEW - War- N.T.S. 2—CARTRIDGE CATCHBASIN STORMFILTER DATA DESIGN WATER QUALITY FLOW RATE cfs 0.07 PEAK FLOW RATE cfs 0.15 RETURN PERIOD OF PEAK FLOW s OF CARTRIDGES REQUIRED 2 CARTRIDGE FLOW RATE 15 GPM STD MEDIA TYPE RIM ELEVATION 260.49 CHECK: RIM - IE-OUT = 2.3 I.E. DIAMETER INLET STUB 256.00 8 OUTLET STUB CONFIGURATION: OUTLET INLET NOTES/SPECIAL REQUIREMENTS: DETENTION TANK TOP OF TANK EL=258.83 DETENTION LIVE WATER SURFACE EL = 258.81 BOTTOM OF DETENTION TANK ELEV = 251.83 LIVE STORAGE VOLUME REQUIRED = LIVE STORAGE VOLUME PROVIDED = 5,391 C.F. 5,580 C.F. ELEV. INCREMENTAL VOLUME TOTAL VOLUME 0 252 36 36 254 1,438 1,474 256 1,992 3,466 258 1.741 5,207 258.83 1 3735,580 1. "THE PIPE EXCAVATION SHOULD BE BASED WITi,IIN STABLE AND FIRM NATIVE SOILS." WATER TIGHT ........ ELEVATION INVERT SCALE:: 1 "=20': H;: 1 `5' V 2. DR 1INE - . A FOUR INCH DIAMETER 0+00 CONNECTION OF THE PVC DETENTION DRAINPIPE SHOULD THE DRAINPIPEINMUST EXTEND ALONG THE FTHE BEDDING JUST BELOW ULL LENGTH OF THE „ 5 4 MIN. DE N UPGRADIENT SIDE OF THE DETENTION PIPE AND BE DIRECTED THROUGH A TIGHTLINE TO A .. . PVC MANHOLE ADAPTOR ,� .... B SUITABLE DISCHARGE POINT BELOW THE TOE OF THE NEW FILLS PLACED ON SITE a N � .- . . . . . . . . . . . rn c� . . . . . . . u. . N �- . . . . . . . N SCALE: 1 "=20' H; 1 "=5' V RUBBER GASKET PLUG Nv ::: t-ZZ ��' I I = ::::::::: :.... .. �c,�'�✓--- ,. I C�RIti CERT ATAf�N PIRr CT RfF• FA►Ct)4—{ 14 CB#2, TYPE 2-54" (SIEE Cmr OF AUSM STD. DIET. STORM-02) OUTLET CONTROL STRUCTURE SCALE: 1 "=2' RAS'4O`tlj26 tKJNG LIL D LI L IN . LI 245 +41:45, . 5.83'.. RT....... A....13+Q4:34, 5.97... I2'I ....... 245 RIM=ice- :263 •: 4 '.6.9 2�'1 INVERT IE=� J18" OUT S) 2.92..49 IE� IN. N) . .o�( :: . 0 EL=2�3 L ::: IE-� 3e IN : E) .: 5 IE 36" : OUT �ETEt TION TANK SECTION A 18" ::: :ZSL•. 0+00 1 +00 EXPIRES 2 5 08 a AL ii v c T. o N iA r 91 = N zE V) Li 0 CL W li a 04 1U3 �pN CN a 000 Z op w R if z 00 9 !�' !�'� 2 :. QW lzw gJv N to i F'.� 33 S�iEaT- 5 OF `1 ,ds-SOicr -SEWER AND WATER PLAN 10, i �- 15' WATER tr tt t SSLE I - i EASEMENT CONTRACTOR TO FIELD LOCATE EXISTING SANITARY SEWER STUB AND REMOVE BACK ! s I PAD EL�263.0 I TO EXISTING BEGIN tt r t PAD EL 265.0 i I -PAD EL=261.0 1 1 ` i:j/ SANITARY SEWER STUB AT MANHOLE t r t I I W PAD EL=261.0 3 t ! ��\\ �. 1 SAWCUT EX. PAVEMENT PER CIS► DETAIL TRAFFIC-03 1 t t I i 6" SIDE SEWER i t t I I STUB IE=255.20 (8'� I I 11 9 LF 8" PVC i l °° 1 i `3/�4 D TER j -,�\ 50' jf ,-CONNECT TO EX. SSMH411-79 RIM=262.23 i \ ----------- 8* PVC E=253.93 8" PVC W=253.83 ��-----= -- _ --------- ------------------ .5 I � � PAD EL=255.0 ``--- -- \�------------ - �,-------- - - ---- - - ---------- ......... f _ _ _ j----------2-62 f TRACT , 1 PAD EL=253.0 / / .. - 2-4•& ---- -- i� F P11, 55 LF 20" STEEL CASING EXTENDING 10' FROM EDGE OF WETLAND. CASING TO BE COATED W/CORROSION RESISTANT EPDXY COATING ON THE INSIDE AND OUTSIDE OF THE PIPE. SPECIAL NOTE: 1. DUE TO TOPOGRAPHY OF PROJECT SITE LOTS 5 do 6 SHALL BE SERVED BY SANITARY SEWER GRINDER PUMPS. 2. CONTRACTOR TO DISTURB NATIVE GROUND AS LITTLE AS POSSIBLE DURING WATER MAIN CONSTRUCTION THROUGH WETLAND. CONTRACTOR TO CONSTRUCT WATERLINE IN ACCORDANCE WITH WETLAND RESTORATION PLANS IN SECTION 6.0 OF DRAINAGE REPORT. AM IF IRRIGATION SYSTEM IS INSTALLED CONTRACTOR SHALL PROVIDE BACKFLOW PREVENTION PER CITY OF AUBURN REQUIREMENTS. AN AUTOMATED SPRINKLER SYSTEM SHALL BE INSTALLED FOR LOTS 1 AND 6. UiLm C©I .,)= ®IE=260.36 (8' W) TP=255.52 (6" SS) IE=257.76 (8" W) TP=256.46 (6" SS) / IE=257.38 (8" W) L�1 TP=256.38 (6" SS) MAINTAIN 12" MIN. CLEAR. ® IE=256.57 (6" SS) TP=256.04 (12' STORM) WATER aSTA. 12+53.52, 14.80' LT DUAL SERVICE TO LOTS 3 do 4 PER C.O.A. STD. DETAIL WATER-15 DSTA. 14+22.29, 25.95' LT SINGLE SERVICE TO LOT 1 PER C.O.A. STD. DETAIL WATER-09 STA 14+22.29, 25.95' RT SINGLE SERVICE TO LOT 2 aSTA. 12+25.42. 12.00' RT SINGLE SERVICE TO LOT 5 STA. 12+54.72, 12.00' RT SINGLE SERVICE TO LOT 6- PER C.OA. STD. DETAIL WATER-09 STA. 14-26.25, 27.14' LT Af IRRIGATION METER LOCATION,Q DF VI A IF REQUIRED 0 U 8" PRESSURE REDUCING STATION -/,.. .\ WITH VAULT PER CITY OF .AUBURN, STD. DETAIL WATER-TOoj: lob; 10C PRV STATION Tp INCLUDE BASK -PRESSURE SUSTAINING VALVE TO MAINTAIN UPSTREAM PRESSURE. CONTRACTOR TO VERIFY THAT WATERMA IN CONTINUES -y TO THE SOUTH OF PROPOSED CONNECTION POINT. CONTACT ENGINEER IF WATERLAIN DOES NOT CONTINUE TO OBTAIN REVISED CONNECTION TYPE. � 6-INCH 6- TO 6-INCH TAPPING TEE INCREASER + + i A" + WATER 1 6-V4CH ' GME VALVE 3 ; NCRETE BLOCKING Ex. 6a STH AVE SE CONNECTION BLOW-UP DETAIL NTS WAT T i iTM DATA: FIELD LOCATE EX. 8" DI WATERLANN (D N: 11313.73 STA. 11 +40.96, 12.21' LT E: 9742.90 REMOVE EX. CAP AND 1-22.5' BEND (ALL MJ) AND CONNECT USING. CONCRETE BLOCKING 1-8" GATE VALVE Q FIELD LOCATE EX. 6" DI CONCRETE BLOCKING WATERLAIN �2 STA. 11 +44.39, 12.31' LT & 18.64' LT WET TAP USING: 1-8"x6" TEE (MJxFL) 1-6" TAPPING TEE 1-6" GATE VALVE 1-6" GATE VALVE 6 LF 6" DI SPOOL 1-6" TO 8" INCREASER 1-FIRE HYD. ASS'Y CONCRETE BLOCKING CONCRETE BLOCKING 3Q N: 11199.05 � LE �*M E: 9668.04 11-87, TYPE 1-48' 1-90' �Ir1D (MJxFL) W LAt3(fiVG Lfi? 1-8' GATE VALVE (FLxMJ) A.-12+48.96, 2.90' LT. CONCRETE BLOCKING IE .Of OUT M zwe ON: 11282.09 IE- r�l+ " IN 2.I1 C%O E: 9670.58 IE- i+ �886* IN 2.ff. � 1-45' BEND (MJxFL) SSMH 411-88, TYPE 1-48" 1-22.5' BEND (FLxMJ) CONCRETE BLOCKING 5T W/SOLID LOCKING LID EXPIRES 2 5 06 A-13+52.27, 2.86' LT. RIM=26ls4I 2.LI.5! IE-28646 8" OUT W) 2SS•i0 IE=�3 R" IN E) 2SC.9( AT C EK WE TM TAE�E UNIT FF ELEVATION STATION FROM NEAREST PIPE LENGTH PIPE DIAMETER IE 0 MAIN PIPE TYPE MANHOLE AND AND SLOPE 1 261.0 MH 2 82 LF 6" 02.OX MIN 255.73 PVC SDR-35 2 261.0 STA: 0+94.91 21 LF 6' 02.OX MIN 255.57 PVC SDR-35 3 263.0 STA: 0+74.87 21 LF 6" 02.0X MIN 255.48 PVC SDR-35 4 265.0 STA: 1 +34.87 22 LF 6' 02.OX MIN 254.62 PVC SDR-35 5 265.0 STA: 1 +30.05 25 LF 6' 02.OX MIN 254.58 PVC SDR-35 6 263.0 STA: 2+02.54 30 LF 6" 02.OX MIN 255.00 - RECORD DRAWING CERM4471 N PRrIECT REF-FAC04-0014 rhEW DM#WWS COAVVW 11O IW THESE PLANS Ally APP FOR CON COWO�R� WTH lt!!r' CITY OF Atl i^S c MW ar w� NT& C.P I z/n/o q Br t�t� THLE/P�irAollw APPIRIOWD BIB COAFvawv BY CI La+/ie VAIr APPROW& A 3 w p V) w V) w °` Q Z `Z w �z j `C0N N 00 z - 2 Z0)tC I Oho I w CN �3inLo uj �� 0 w to 00 tN W N -� I h 3 ` 46 cn .........................................................................................................................................................:.........................................I.: w..... . ........ ........ ........ ... .... ........ ..... ........ 2 ......................................I....;..................,.. ..................:........................:........................:........ ................:........................:........................:....................... : 275 : . . . . . EXISTING GRADE .. .:: ; ... .... AT SECTION ..:::: .. . ...... ....... .............. :270 ......�....: .....:. :...................................................... .................. .... :... 270 ..... .............. ....:......... ?... _.: ........ : ........ PROPOSED GRADE..... .... ... . AT SECTION: .. :: ... ...�.. ... .::: .... ....... ......... \ ... ........... ........................... 265.......................:........................:... . 265 \ ,�...... ....... ... ... ... .. .. ... ...... ......... : ..... \:: : 260............................................................................................ ......... ........ ............... ..................... .................. ........ ....... ......... ......... 260 \: ...:: . \:. .. .... \: . ....................................:.........:....a. 255........................:........................:........................ ...... ................. ..................... :.......... ;.......... ° ....:....:....:....:.... ° ....:....:.........:.... .....�.....-..., 255 ... ... ....:...:::.. \. ....... ......... ........ ........ ......... 4....... ....... 250............................................. ................................................................�.. .. .................:..................... 250 245........................:........................:...............................................:..................... .................... ........... \ 245 : :: A::::: :: \�: ... 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'.... . . .... .... .... ... ... ........ ... ...... ......... .........:.........:.........:..... ........ ...... .. : EX :GRJIDE ` :::::::: Yit�4TEIMiA1N.... ........ ........ .. PRV STATION. SEE E 6: SH Ef : ......... : .............AX . ; ......... ; ..................:.. . ........ ......... ........ ......... . . . . . . . . : . . . . . . . . . : . . . . . . . . . . ....... ......... ......... ......... ......... ...... . . . . . . . . . ...... �.. 270 .....I...: . .......,.- .........:.... / "_.......---, —. . ............................................................................................................................................................................ ... :......... ...... — .........:.........,......... .....I... ..'................................................�............ ...................... ......... ........ ........ /.. ......... ...................... ...................... ...................... ..... ......... ......... ...................... ...................... ...................... ........ ......... ......... 2 70 ....... .........:,; �. .....�. r ..... :... ...... ...... .... :..... SEE. SHEET . 6 ..... X......:.. .. :... ::::: ::::::..: :::::. PROPOSED GRADE::::::::::::::::::::: ......... .........:.........� .........:' ......... ..... . FOR CEIINUATKX+1 AT OF �YATEN.................:.........:........ . :.........:...../..................... ;.... .....................:........................:........................:...................:........................:.......................:........................:........................:........................:........................:........................:..............................................:............................................... ..... ..:.........:......... ....... .................. ..............: �. ... ..... .. .. 265 :........:..........- f/:..... ; ......... ; .........:....... F...... ... ... .......\.:...... ...... ........ ........ ......... ........ .... .... ...... .. 1. ............. ...................... 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A 2 i F0 / S 1 EK�r-,�\ /pNA L EXPIRES 2 5 06 03 z ." �.w hie ail M c cr N � H5 0 P U `V K j iA R9 &V% 6 l;i:6<:,A 0 �00 Q Q 4� � U I_ Q �d 1 It c e < 1. 2 Z 3-8 0 6 .L) 5 488� � z g-vco !2 o x "a �r� �40 — A W ,�.M Nr Z rrr/ i 8 N: 11281.29 E: 9668.79 s Go 1-45' BEND (MJxFL) V I 1-22.5- BEND (FLxMJ) �r CONCRETE BLOCKING 0 0 N: 11313.73 0001% E: 9742.90 !i i5 AlAft W) 1-22.5 BEND (ALL MJ) w N 04 N CONCRETE BLOCKING v* 41 @6 FIELD LOCATE EX. 6" DI g I, WATERMAIN 2 i WET TAP USING: } 1-6" TAPPING TEE www! < z 1-6" GATE VALVE a 31: 1-6" TO 8" INCREASER PC . � CONCRETE BLOCKING In 81 .j 9 w � D C4 ?H m Z q. � o 20"x55' STEEL CASING W/CORROSION RESISTANT EPDXY COATING Q //� ON THE INSIDE AND OUTSIDE OF THE CASING PIPE � inV v v I IR 0 iA A :E 1 8" CL-52 DI I c -1 MM M c .at o 0 4"X4" WOOD IN z a G/) cn OF SKIDS 4LONGz LL 0 9 NGTH OF DI PIPE w cv 2 1x1/8STEEL STRAP WELDED 7'N')NNz Q 0 N C14 OVER DI TO HOLD IN PLACE Z � (DD pop WA TERMAIN STEEL CASING DETAIL r Q ' ' z . 52 6NZNN NOT TO SCALE V_ p-" W) t � DO W ,I- * .-� s,/ /:., , , asrE 6-Z2-s PR"cr R£F.• FAC04-0014 / ) / / / ', h M / r, / / 1 / 7► ter���� . , 1 I ,,, r ; 4 OAF/ , t�3_ 0 2 W 0 z A�- l3v coN Z 0 z I T) r- N a e X ia 0 .0 V O r) 11 O V r- 0) O U) 7- 0 -0 jO O 1 U) o N z is 'F a� � N l.i P i11 - - 1 OCb/&O Establish water line connection for Reserve grovels and sand from irrigation supply to restoration area. creek bed to be replaced as Temporary irrigation supply to restoration top lift of bockfill for reestablishing area shalt be installed for supplyy in. first year creek bed. and until plant materials are esfiabllshed. Interceptor drain outfoli t • NGPA Sign Location S.E. 302nd STREET SITE MAP APPROXIMATE SCALE 100 0 100 200 feet h --7 22 zJ�1" s M \\�\�\` � -- I�jll'�������\ �otX r 7erxce shall kw-271 6'x4*x6' Douglas Fir pressure treated and incissed Posts 0: final design by others FENCE. DETAIL NOT TO SCALE DISTURBED BUFFER RESTORATION PLAN Residents of existing Lot 41 have extended their area of landscaping into the designated fifty foot buffer for the Cobble Creek project. This work involved clearing of the shrub understory and the placement of bark mulch over the buffer area and up to the stream bank. It does not appear that any larger trees were affected. In its present condition, the affected buffer area is covered in bark mulch with very little herbaceous or shrub growth beneath the larger trees. Approximately 4,000sq.ft of the buffer is affected. The general goal of the buffer restoration for this area is to accelerate the reestablishment of native shrub understory on the affected buffer. Achievement of this goal will include the installation of native shrub plantings and communication with neighbor to inform them of the location of the property line and the importance of the protection of the buffer vegetation. Standards of Success A determination of the success in achieving the mitigation goals and objectives will be based on the following quantitative standards. With the exceptions of item one and two which identify standards to be achieved at the end of the first year, these standards are to be achieved at the end of the three year monitoring period. 1. One hundred percent survival of planted trees and shrubs at the end of the first year. Any plant materials which have not survived shall be replaced during the first year. 2. Eighty percent survival of planted trees and shrubs at the end of the three year monitoring period. 3. Non-native and/or invasive plant species shall not exhibit more than 10 percent coverage within the planted mitigation areas at the end of Each growing season during the three year monitoring period. These species include but are not limited to reed canarygrass Himalayan blackberry, and Scot's broom. 4. A minimum of 70 percent average native vegetative cover of trees and shrubs on the area included in the restoration planting area. Plant species composition shall meet the intent of the mitigation goals. 4'-0" SITE CONDITIONS The subject property is an irregularly shaped parcel of approximately 9.7 acres in the City of Auburn. The property has frontage on 106th Avenue SE at the south end of the site and there is access to the north end of the site from the existing cul de sac in SE 300th Street. The "Wetland Evaluation -Conceptual Wedand/Stream Restoration" report dated April 14, 2004 describes existing site conditions with respect to the wetlands and stream on the property. Cobble Creek runs through the central section of the site flowing from the northeast corner toward a culvert in 106th Avenue SE. Topographically, the property generally slopes down from the east and west to the creek. Cobble Creek enters the property at about elev. 254 feet and discharges into the culvert in SE 106th Avenue SE at about elev.192 feet. The wetland extends part way up the side slopes on either side of Cobble Creek. Hydrologically, the wetland is primarily supported by groundwater seepage. This seepage from the side slopes contributes to flows in Cobble Creek. At the time of our site observations in December, 2003 and January, 2004, there were flows in Cobble Creek. In mid July,2004, there were no surface flows within the stream channel although there were isolated sections of shallow surface water within the channel. The wetland limits on either side of Cobble Creek, as reported in the April 14, 2004 report were flagged by AlderNW and have been surveyed and plotted on project maps by Barghausen Engineers. A fifty foot buffer measured from the wetland edge has been designated for the wetland. The area inside of the assigned fifty foot wide buffer is being set aside from development as a designated sensitive area identified as Tract A. The buffer along the west side of the wetland, adjacent to the proposed new development is generally forested. With the development of the existing residential development along the west side of the property, the forest cover has been opened up and Himalayan blackberry has become established as shrub cover within much of the southern section of the wetland buffer on the west side of the wetland. Along the northern section of the property, there has been less recent disturbance and the buffer is occupied by mature forest with shrub understory of salmonberry, Vine maple (Acer circinatum), and Oso plum (Oemleria cerasiformis), among others. PROPOSED DEVELOPMENT It is proposed to develop the property for construction of six residential building lots as shown on project development plans prepared by Barghausen Engineers, Inc. This project does not include new development on the east side of Cobble Creek. The area inside the designated buffer limits is being set aside from development within a designated sensitive area/native growth protection easement. Storm water treatment will be provided in a vault to be installed off the east end of the access road. Discharge from the storm water treatment vault will be by way of a level spreader structure to be placed along the outside limits of the wetland buffer. Except for the new water line to be installed within a fifteen foot wide easement along the north property line, there will be no grading or clearing within the buffer and there will be no wetland fill. The water department has required this line to provide a looped system for this and adjacent residential developments. Construction of the water line will require temporary disturbance to the buffer on either side of the wetland, and a crossing of the wetland and Cobble Creek. Approximately 2,100sq.ft of the buffer on the west side and 885sq.ft. of the buffer on the east side of the wetland will be temporarily affected by the construction. The total buffer area affected will be approximately 2,995sq.ft. The water line easement passes through the upland forest habitat within the buffer on either side of Cobble Creek. Red alder (Alnus rubra) is the predominant tree species on the easement area, with few big leaf maple (Acer macrophyllum) and western red cedar (Thuja plicata). The understory is sparse under the tree canopy. Shrub species present include Oso plum (Oemleria cerasiformis), thimbleberry (Rubes parviflorus), hazelnut (Corylus cornuta), Vine maple (Acer circinatum), and Oregon grape (Mahonia aquifolium). The predominant herbaceous ground cover species is sword fern (Polystichum munitum). The creek channel where it crosses the easement has a cobbley, gravelly, sandy bottom and is about four to five feet in width. On either side of the creek the side slopes are quite steep. There is a thin margin of wetland on the west side of the creek. On the east side, the creek bank extends to the side slope with no wetland. BUFFER/STREAM RESTORATION PLAN Restoration Goals and Objectives As a condition of approval for construction of the water line across the wetland buffer and stream, the affected areas of the stream and wetland buffer shall be restored. The general goal of the mitigation design for the disturbed buffer areas is to accelerate the reestablishment of native trees and shrubs on the buffer areas which will be disturbed for construction of the water line for project. The mitigation design for this area involves two objectives: 1. Establishment of native shrub cover over the disturbed area with a minimum of 3 native shrub species and 2 tree species. 2. Restoration and stabilization of disturbed stream channel. Standards of Success A determination of the success in achieving the mitigation goals and objectives will be based on the following quantitative standards. With the exceptions of item one and two which identify standards to be achieved at the end of the first year, these standards are to be achieved at the end of the three year monitoring period. 1. One hundred percent survival of planted trees and shrubs at the end of the first year. Any plant materials which have not survived shall be replaced during the first year. 2. Eighty percent survival of planted trees and shrubs at the end of the three year monitoring period. 3. Non-native and/or invasive plant species shall not exhibit more than 10 percent coverage within the planted mitigation areas at the end of each growing season during the three Year monitoring period. These species include but are not limited to reed canarygrass Himalayan blackberry, and Scot's broom. 4. A minimum of 70 percent average native vegetative cover of trees and shrubs on the area included in the restoration planting area. Plant species composition shall meet the intent of the mitigation goals. 5. Stream channel shall be stabilized prior to beginning of fall rains when surface flows in stream will resume. Temporary weirs and diversion pipes shall be installed and maintained as necessary to protect channel. 6. Storm drain outfalls and level spreaders shall be inspected and must result in no erosion e> instability of hillside. Mitigation Monitoring The restoration area will be monitored over the three year period following completion of the restoration work. The purpose of the monitoring is to verify that the restoration work has been implemented and that the restoration area is developing to meet the mitigation objectives. Monitoring will include measurements of vegetative cover and plant survival. Sampling Methods Vegetative cover will be sampled by measurements along two 50-foot long permanently established transects. One transect will be placed on either side of the Creek. Data to be collected on these transects include surviving plant numbers and aerial coverage by species. Permanent stakes will identify the end points of each transect. In addition to the sample transects, permanent photo points will be established from which the mitigation area can be photographed. These photos will provide a pictorial record of the development of the area over time and will be used to supplement the quantitative sample transects. Monitoring Schedule The project biologist should provide construction inspection services during implementation of the mitigation plan to ensure that mitigation design objectives are being met. It is important that a wetland biologist provide observation and consultation services when work is underway within the restoration area. This is to assure that the restoration design is being appropriately interpreted, to be available to provide consultation and make adjustments in the event changed conditions are encountered, and to identify the specific limits of work. An initial report describing the as -built conditions will be prepared for submittal to the City of Auburn when construction work has been completed. This report will be prepared upon completion of the plantings for the project, and will identify the work completed and document the baseline conditions for defining the success of the project in subsequent monitoring reports. Following completion of the project and acceptance of the plantings, the mitigation area will be monitored on the following schedule: ❑ 30 days after completion. ❑ During the month of April of the first year after installation of the plant materials. ❑ During June or July of the second year after completion. 11 Final inspection of the mitigation project three years after the restoration work is installed and accepted as complete. D The restored stream channel shall be reviewed when work is completed. Subsequent monitoring visits shall be completed monthly in September, October and November after work is completed. If at the end of .this time it is determined that the channel is stable monitoring may stopped. ❑ Maintenance inspections for control of invasive species shall be conducted twice annually, during April or May and during -June or July. iVlaintenace to control invasive species growtrh shall be instituted as necessary. The wetland biologist will monitor the project on the above schedule and prepare written reports addressing wetland hydrology, survivability and growth of plant materials, as well as any recommendations for maintenance or remediation. These reports will be submitted annually to the City of Auburn. The wetland biologist will prepare a final report at the end of the three-year monitoring period to be submitted within. 30 days of completing the final mitigation inspection. This report will address the success of the project in meeting the project objectives. Care and Maintenance The mitigation area shall be examined twice annually during the three year monitoring period to determine the possible invasion of weedy pest species such as Scot's broom, reed canarygrass, and Himalayan blackberry, which compete with more desirable native species. Maintenance activity need not be scheduled to coincide with monitoring visits although monitoring results shall be communicated to maintenance personnel. Annual maintenance activities to control invasive species shall be carried out in the spring (April or May) and again during the summer (July or August). Reed canarygrass can be periodically cut to control its growth, and blackberry or Scot's broom can be physically pulled out or cut down. Red alder and black cottonwood, or other tree seedlings which may become established shall be thinned to 8 ft. to 12 ft. centers. Irrigation may be required during the first summer and possibly during the second summer after installation. Water shall be applied as necessary depending on rainfall and soil moisture conditions. Irrigation should be provided by installation of temporary irrigation pipes. Requirements for replacement of dead plant materials shall be identified during the annual monitoring inspections. Replanting as necessary will be carried out during the dormant season. Trash and effects of vandalism shall be removed as soon as possible after appearance in the area. Contingency Plan The proposed restoration planting plan has a high probability of success. If it becomes apparent from the monitoring program that the restoration objectives are not being met, a joint determination by the project applicant, the wetland biologist, and the City of Auburn will be made to implement a contingency plan. The contingency plan can include measures such as replacing plants that have not survived and removing competing weedy species. Construction Timing. Work to be completed within the stream and wetland should be completed during the time period mid July through mid September when flows within the stream will be at a minimum. Work should be completed by late September to allow surface soils to stabilize before autumn rainy season resumes and the follows in Cobble Creek increase. Before beginning any work in or adjacent to the stream, construction techniques should be determined and reviewed to assure that the work can be completed quickly and with minimal disturbance. If construction work for installation of water line is to be carried out during periods when there is surface flow within Cobble Creek, a diversion system shall be installed to transmit surface water across channel segment affected by the construction. A diversion dam may be constructed using straw bales and temporary piping. Diversion dam and piping shall be inspected and maintained during construction and until stream bed is stabilized. City of Auburn # SEP 04-0009 0�1 I?, - Date • • • • •i s i r i D 0 1 t co M • • • M t� Q --1 0p Q �CY).- -&-i rJ V) 00 i� �l 0-) O CO In C Q N O Q C 3C �+v p 0 336 SENSITIVEDETAIL AREA SIG -Reserve ravels and sand from g _ \ \ creek bed to be replaced as 264 p . 26; top lift of backfill for reestablishing PLANTING PLAN creek bed, //� � � ��//(Water' NATIVE GROWTH PROTECTION AREA / � W� Line Restoration) 7 2 � Interceptor drain outfall _270 THIS STREAM, WETLAND, 268 AND UPLAND BUFFER ARE / 1'' / / \ PROTECTED TO PROVIDE WILDLIFE HABITAT AND _ \\ 4 6 ► V T C 3 MAINTAIN WATER QUALITY. ®s Sb 14 oy�et 0 c� !_!--`�� V V PLEASE DO NOT DISTURB — / �' ,� e� b THIS VALUABLE RESOURCE. Df D C 30 imbed 27a 18° N.G.P.A. Sign as shown above Q ANW 2 — I` � I SHED `j�HOUc. Rest re Water line /LLJ eas m PN _ following �. 4E z ANW-9C pi on t r c t i o n w ssure treated post C/, Se. plan by Barghausen En veers, Inc. PA Si fo const u"-t�Eon and tempor y erosion ,-: �// W ��� c n trot Beta 1I s. CONSTRUCTION NOTES 1. Prior to beginning any work, a pre -construction meeting will be held for review of procedures, project i % / Z7 SHED scheduling and availability of plant materials. Representatives of City of Auburn, project owner, / % �'� / / ANW - 6 E participating general and landscape contractors, and the wetland biologist shall be invited to attend this Place signs at approximately 100ft intervals along boundary between development and wetland buffer. signs to be placed. PLANT SCHEDULE BUFFER RESTORATION Symbol Scientific Name Common Name Size uantity** osier Cornus stolonifera red -osier dogwood slips* 70 rose Rosa gymnocarpa wild rose 3gal 60 saalll Gaultheria shallon salai I gal 30 salmonberry (Rubus spectabihs) salmonberry 1 gal 30 * Slips are available and may only be used during dormant season, November through March. Rooted cuttings shall be used if plantings are to be installed during summer season. Slips shall be minimum of three feet in length with minimum diameter of V2 inch. Slips shall be planted with minimum 1/3 of length in contact with soil. Number of plants may be reduced by 1/2 if rooted cuttings are used in place of slips. APPROXIMATE SCALE 0 30 S.E. 302nd STREET meeting. 2. The project should be carried out using best management practices including the installation and maintenance of erosion control measures. These measures include installation of silt fences on either side of the creek to reduce movement of soil and material from the exposed soils of the back filled trenches: use of diversion dam and or pipe to carry surface flows across the disturbed creek bed during construction and until the creek bed is stabilized; construction techniques to limit the movement and operation of equipment within the wetland/stream bed; stabilization of disturbed surface soils using straw or other soil stabilization measures immediately after work is completed. See water line construction design plans by Barghausen Engineers, Inc. for erosion control measures. 3. Contractor shall be responsible to provide sound, healthy, vigorous plants without defects. Contractor will i provide irrigation for new plant materials as necessary and shall warrant survivability of plants for one year after acceptance of planting. 4. Plantings of nursery stock may be made depending on availability from suppliers. The preferred planting time is during the winter dormant season, November through March. Contractor should contact suppliers to verify availability of plant materials for the anticipated planting season 5. All planting and seeding activities shall conform to normal landscape industry standards. 6. All installed plants should be clearly marked and identified to simplify subsequent monitoring. ' 7. Plant substitutions may be possible with approval of wetland biologist and City of Auburn. Any substitutions will be native to the Puget Sound region. 8. Gravel and sand from creek shall be reserved during excavation and installation of water line for use to place for restoration of stream channel. 9. Surface soils from the trench should be preserved during excavation and used as the final lift in back filling the trench fine. These soils will contain seed and other plant materials which will regrow and provide partial restoration. If there is movement of heavy equipment over the surface soils resulting in compaction, the surface soils should be tilled. 10. Stumps and trunks of trees cut for water line construction may remain to provide habitat features within the buffer area. ANVr ANW-105 ANW-1 CENTERLINE CREEK PLANTING PLAN (Disturbed Buffer) Restore disturbed buffer area with plantings of native shrubs. `'—IE 24" CMP SW=182.21 i a+l�iAi / -7 4 n ANW-31 E ANW-32E ANW-33E PLANT SCHEDULE RATER LINE RESTORATION Symbol Scientific Name Common Name Size Ouantitv* * Df Pseudotsuga menziesii Douglas fir 3' 4' 8 Cc Thuja plicata Western red cedar 3 %4' 6 BLM Acer macrophyllum Big leaf maple 3'-4' 4 osier Cornus stolonifera Red -osier dogwood slips* 110 snow SymphoKcarpos alba snowberry 3gal 60 salai Gaulthena shallop shaal 1 gal 60 Ogrape Mahonia nervosa Oregon grape I gal 30 rose Rosa gymnocarpa wild rose 3gal 60 Vm Acer circinatum Vine maple 5 gal 22 Sb Amelanchier alnifolia Serviceberry 3 gal 10 * Slips are available and may only be used during dormant season, November through March. Rooted cuttings shall be used if plantings are to be installed during summer season. Slips shall be minimum of three feet in length with minimum diameter of % inch. Slips shall be planted with minimum 1/3 of length in contact with soil. Number of plants may be reduced by 1/2 if rooted cuttings are used in place of slips. **Numbers of plants provided is based on average spacing of 9ft. O.C. for trees; 4ft O.C. for shrubs and lft to 2 ft on center for cuttings. Area disturbed for construction of water line shall be seeded with annual rye grass following construction. If work is completed during winter season before grass seed will be expected to germinate straw mulching shall be installed at minimum thickness of 2 inches. Jute matting may be required on steep slope sections on either side of the stream for surface stabilization. APPROXIMATE SCALE 30 0 30 60 feet City of Auburn # SEP 04-0009 Auburn Dff IL- Z2-0 Date -r- >1O Q to E °� 0 ° cn 0) U cy) c� CN C- 4-, E fy Q Z3 (� _® (U all -E' Q > ry U) N 0 I .. � N N Q -+-1 Q0 °Ln d � J � � I Q) Ln — c- u I-- --DN 4, ® N Q) EL K) o n OC) Q V✓ I V) 00 00 �1 Lo Q, N O ® � � z�o 00 -C i7 F•- V) ,NO r d 33 T