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CONSTRUCTION NOTES 0
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<br /> 4 CATCH BASIN, WITH NON-TRAFFIC GRATE PER DETAIL HEREON _w
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<br /> 5 6" PERFORATED HDPE DRAINAGE PIPE 0
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<br /> 6 CONSTRUCT 6" PORTLAND CEMENT CONCRETE PAVEMENT OVER 4"CRUSHED AGGREGATE BASE W
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<br /> 7 P.C.C. CURB PER DETAIL HEREON
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<br /> ti 3 12 INSTALL 1" HDPE PIPE ORIFICE FOR 6" PIPE Z 0
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<br /> I S 58'16'15" E 200.00' 13 INSTALL HDPE SCH. 40 DISCHARGE TO EXISTING STORM DRAIN BASIN, SIZE PER PLAN Z ,>
<br /> 5.0,0' PROP _ n g 14 INSTALL NDS EZflow SUBDRAIN WITH 4" DIA. SLOTTED PIPE, EZ-1001F OR EQUIVALENT(ndst�ndspro.com) W
<br /> EASEMENT - Z
<br /> 1 15 INSTALL HDPE SCH. 40 DRAINAGE PIPE, SIZE PER PLAN I-
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<br /> SEE NOTE 3 �`�.t . . %
<br /> s-- - 1 5, INV 561.54© ®1
<br /> 21 INSTALL 18"X18"CATCH BASIN WITH PARKWAY COVER PER DETAIL HEREON a
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<br /> s 4 �� ^^ 22 INSTALL ADS (OR EQUIVALENT) ROOF DRAIN ASSEMBLY PER DETAIL HEREON. http://www.ads-pipe.com/en L
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<br /> ' INV 561.54/ yep 14 -- / / -0 23 CONSTRUCT DRAINAGE CLEANOUT (DCO) PER DETAIL HEREON 0 oz
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<br /> F\++.6'' W////65.00 LF 4" HDPESLOTTEDPIPE/7 7/ 2 ---Q--- v)
<br /> 6', a w -�- 0 37 TYPICAL RESTRICTOR (CITY OF EVERETT STANDARD PLAN 415) IN 54" DIA TYPE 2 CATCH BASIN (STD 405) Z
<br /> _ �\ DCO �'a a Ce- W o
<br /> 3 r s° INV 561.4249 W ® (, -Z tj..
<br /> - 40 STORMTECH CHAMBER SYSTEM a = W_ Z Z QI - ® F JOIO . -- --
<br /> 1 I 0. --I Co m w INFILTRATION FEASIBILITY w V Z
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<br /> �4 I 221NV564.9" , Q - 133 - THE PROJECT GEOTECHNICAL ENGINEER, TERRACON, HAS EVALUATED THE FEASIBILITY OF ON-SITE 2 5 2 �'
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<br /> ti - _- INFILTRATION OF STORM WATER RUN-OFF. AT THE PROJECT SITE TERRACON OBSERVED APPROXIMATELY 1 LU CC d V
<br /> 3 I `� zv 23 DCO �14, DCO 22 U ---a--- c FOOT OF UNCONTROLLED/UNDOCUMENTED FILL ON THE UPHILL (NORTH) SIDE OF THE SITE INCREASING TO eg ai g v
<br /> ti I rn o INV 564.54 15 INV 564.63 INV 560.33, I APPROXIMATELY 7 FEET OF FILL ON THE DOWNHILL (SOUTH) SIDE OF THE SITE WHICH IS UNDERLAIN BY 0 = H Z
<br /> LU I - --I--- GLACIALLY CONSOLIDATED SOILS WHICH HAVE A VERY LOW RATE OF INFILTRATION. PER THE 2014 VERSION OF N V oc Y
<br /> E�o - a Iw_ I THE STORM WATER MANUAL FOR WESTERN WASHINGTON SITE SUITABILITY CRITERIA SSC-5 AND SSC-6 WOULD c/') ori
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<br /> fri SIC) CB 4' = a ---�--- APPLY TO THE SITE AND TERRACON RECOMMEND THAT IT IS NOT A CANDIDATE FOR ON-SITE INFILTRATION. cc LU .2 ~ Q cc
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<br /> SSE22 r --f--- 1O ISSUES PRECLUDING SITE INFILTRATION: w Q VI ad o
<br /> ®.CO 29.65 LF 6" V 564.95 O O 1 PER SSC-5 THE DEPTH OF THE LOW INFILTRATION LAYER (GLACIAL TILL) FROM THE BASE OF THE INFILTRATION w 1.°- OC Q 8
<br /> HDPE 6.0% r o I ELEMENT SHOULD BE 5 FEET OR GREATER. THIS IS NOT POSSIBLE FOR THE MAJORITY OF THE SITE. THE cc V
<br /> INV 561.21 � cn � ;r = � a �n
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<br /> V +j DEPTH FROM THE BASE OF THE INFILTRATION ELEMENT IT READS MAY BE REDUCED TO AS LITTLE AS 3 FEET
<br /> - •`� rn rN 0 __ i __ WITH A MOUNDING ANALYSIS AND UPSIZING OF THE INFILTRATION SYSTEM HOWEVER THE SITE DOES NOT 0
<br /> m 0 4 " �' I HAVE ADEQUATE SPACE AND DEPTH TO ACCOMMODATE SUCH A FACILITY" 0 .
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<br /> _, - 4�® 22 DCO 15 _� i
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<br /> -W_ -n l °_' SCO 22 INV 564.47 '�. F- SEE NOTE 3I- s am
<br /> of �i" NV 564.21 a IN ADDITION, SSC-6 PRECLUDES SITE INFILTRATION OF STORMWATER IN THE "UNCONTROLLED OR CD
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<br /> 3 DCO, INV 560.33 j 1 NON-ENGINEERED FILL SOILS" AT THE SITE OBSERVED ABOVE THE TILL. AS REQUIRED BY SSC-7, IMPACTS TO s
<br /> fD V 5�� 13® Lu NEIGHBORING PROPERTIES, WOULD ALSO INDICATE THAT ON-SITE INFILTRATION IS NOT FEASIBLE AS w . '.c_ ,. V w111
<br /> Z I I ® IN w «, COLLECTION AND INFILTRATION OF STORM WATER RUN-OFF MAY CREATE A SLOPE STABILITY OF AN _,.xr 0 z O •
<br /> LLI ti INV 560.67 DCO m APPROXIMATE 2.5 HORIZONTAL: 1 VERTICAL SLOPE APPROXIMATELY 8 OR SO FEET IN HEIGHT LOCATED ON THE 0 ' ' w N m
<br /> W B, „B„ INV 560.83® �I '-_- NEIGHBORING PROPERTY NEAR THE SOUTHERN PROPERTY LINE OF OUR SITE. V Q Cl„. rn
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<br /> C/ ! CB O4 65.00 LF 4" HDPE SLOTTED PIPE U N Z ' >- V
<br /> rn 3 oT INV 560.67 - A IN REVIEW OF THE ABOVE, IT IS THE CONCLUSION OF TERRACON THAT SITE INFILTRATION DOES NOT APPEAR - 4 'Q cc
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<br /> INV 560.55 ® -- I FEASIBLE PER THE REQUIREMENTS OF THE MANUAL AND THEREFORE BIOFILTRATION BMP DESIGN ISC Q Z d
<br /> 'a� 30.03 LF 6" F
<br /> CONSIDERED FOR THIS SITE. 0 < O
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<br /> N I (�Ir' C - 1� 1. PRIOR TO DEMOLITION OF THE SITE, CONTRACTOR SHALL FIELD VERIFY THE POINT OF CONNECTION FOR z t N
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<br /> EA EIJIE T 37 � THE STORM DRAIN SYSTEM AND CONTACT THE ENGINEER WITH THE ELEVATION OF ALL INVERTS AND THE %
<br /> INV 560.00 ��'/ SEE NOTE 3 0 40 CONFIGURATION OF THE STRUCTURE. U --
<br /> ®®EXISTING CB 3 I SUMP 558.00` ��� D
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<br /> TG 562.16' `
<br /> INV 559.78 ® I I I I I I I I I I I I I 2" BIORETENTION SOIL MEDIA PER BMP T7.30 "DEFAULT BIORETENTION SOIL MEDIA (BSM)" AS SHOWN ON 0 C
<br /> EX INV: 559.86 12" RCP-NE � �'�,.#
<br /> EX INV: 559.76'6" RCP-SE I 44.28 LF 6" (iri 1 ///��iiY� �� i%Y / � �/ ���7 ---- VOLUME 5, PAGE 7-18 OF THE STORMWATER MANAGEMENT MANUAL FOR WESTERN WASHINGTON, cc
<br /> �'� HDPE� 0.5% � �ll �1 DECEMBER 2014 CI-
<br /> EX INV: 559.66 12" RCP-SW �� I ' I I I I I I I I I I I I I (
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<br /> SUMP: 558.5' 15 �Cg 1 l 1 l 1 1 1 1
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<br /> U INV 560.41 '�� CHAMBER INVERT 560.00 CHAMBER INVERT 560.00 ...i.......-"Ii3. CHAMBER SYSTEM PER DETAILS SHOWN ON SHEETS C-301 THRU C-306 IYo4w
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<br /> PROPOSED WALL 12 25„ SIDEWALK PROPOSED _ 5.00' - PROPOSED CURB U
<br /> 1/1:061-..z r BOTTOM WIDTH3.00' BOTTOM WIDTH PROPOSED A.C. Z 1-. wl.w� BOTTOM WIDTH -�7-�7-� a ° PAVEMENT w Z_u'• SOIL AMENDED �' SOIL AMENDED � a_ A /\`� \\ \�` ' SOIL AMENDED \ \ cc Z w N •a 7� WITH COMPO T -� , " • \ / SWALE `�' \ EX.GRADE Z d w CL NS � ^ / ,. _ ° WITH COMPOST �' j�/\� / / •\ WITHCOMPOST BOTTOM w
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<br /> 5/8"MINUS CLEAN DRAIN ROCK 40MIL HDPE IMPERMEABLE LAYER \�/\\/// C�//\\//j��\40MIL HDPE IMPERMEABLE LAYER
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<br /> E 6"HDPE PERFORATED UNDERDRAIN CL
<br /> oPIPE CENTERED BENEETH SWALE 5/8"MINUS CLEAN DRAIN ROCK \ \\,\\\\\\ w > Z
<br /> 0 6"HDPE PERFORATED UNDERDRAIN Z Z Ily W
<br /> MULCH PIPE CENTERED BENEETH SWALE MULCH MULCH Q
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<br /> SOIL MIX PER SMMWW BMP SOIL MIX PER SMMWW BMP • SOIL MIX PER SMMWW BMP 0 E"i > W
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<br /> T7.30(SEE NOTE 2) ,-- T7.30(SEE NOTE 2) T7.30(SEE NOTE 2) LU p[
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<br /> ,...0 FILTER FABRIC WRAP OF TOP, SIDES,AND BOTTOM FILTER FABRIC WRAP OF TOP, SIDES,AND BOTTOM r FILTER FABRIC WRAP OF TOP,SIDES,AND BOTTOM r a.w2 CC W
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<br /> a o ' 6' HDPE PERFORATED UNDERDRAIN -' 6"HDPE PERFORATED UNDERDRAIN 6"HDPE PERFORATED UNDERDRAIN = H L�
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<br /> E N PIPE CENTERED BENEETH SWALE rel PIPE CENTERED BENEETH SWALE �/�► " PIPE CENTERED BENEETH SWALE \ I- ,•• r� •iN Q w O yl
<br /> u o 40MIL HDPE IMPERMEABLE LAYER //\ 40MIL HDPE IMPERMEABLE LAYER v' = a Q
<br /> �` 40MIL HDPE IMPERMEABLE LAYER = CC
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<br /> ° v ORIGINAL SOIL ORIGINAL SOIL ORIGINAL SOIL ` g SHEET NO.
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<br /> .3_ SECTION "A" - "A" SECTION "B" - "B" SECTION "C" - "C" in
<br /> up~t BIORETENTION WITH UNDERDRAIN DETAIL BIORETENTION WITH UNDERDRAIN DETAIL BIORETENTION WITH UNDERDRAIN DETAIL =
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<br /> o iL NOT TO SCALE NOT TO SCALE NOT TO SCALE SCALE: 1" = 20' ~
<br /> �c•T3 OF 7
<br /> a L:3
<br /> CITY OF EVERETT
<br /> REVIEWED FOR PERMIT
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