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WENTZ SP <br /> SECTION 23 , TOWNSHIP 28N , RANGE 4E5 W. M . Z <br /> 0 <br /> a <br /> rr <br /> U <br /> N <br /> DOE BMP T5.13 — SOIL AMENDMENT SPECIFICATIONS: <br /> ^o <br /> Soil quality. <br /> ®® Q \ IE=538.54(18"CMP SW) W <br /> All areas subject to clearing and grading that have not been covered by impervious surface, F <br /> SSMH ; \ incorporated into a drainage facility or engineered as structural fill or slope shall,at project p <br /> RIM534.9854 2 CL <br /> IE=534.98 / Q \ 1 completion,demonstrate the following: <br /> a a a a a <br /> M A NA 88 1. A topsoil layer with a minimum organic matter content of 10%dry weight in planting <br /> 541.00' beds,and 5%organic matter content in turf areas,and a pH from 6.0 to 8.0 or matching <br /> the pH of[he undisturbed soil.The topsoil layer shall have a minimum depth of eight <br /> Sq inches except where tree roots limit the depth of incorporation of amendments needed .(••.�y��_ <br /> I to meet the criteria.Subsoils below the topsoil layer should be scarified at least 4 inches 6 <br /> CTYt with some incorporation of the upper material to avoid stratified layers,where feasible. y?o�• •o,�,r <br /> RIBM=540.16 I \ 1 I 2. Mulch planting beds with 2 inches of organic material Q `„ <br /> IE=538.43(12"CONC N. ,n 1 <br /> IE=538.34(12"CONO SW� I 1 I 3. Use compost and other materials that meet these organic content requirements: <br /> PRIVATE DRAINAGE IE=538.24(18"CMP NE) 1 I \ a. The organic content for"pre-approved"amendment rates can be met only using d�•••••. <br /> / <br /> EASEMENT IE=538.35(18"CMP S Q S <br /> compost meeting the compost specification for Bioretention(BMP T7.30),with <br /> TO BENEFIT TPN: u, I the exception that the compost may have up to 35%biosolids or manure. <br /> 00552500003200 II The compost must also have an organic matter content of 40%to 65%,and a <br /> IE=538.99(12"CONC S) carbon to nitrogen ratio below 25:1. <br /> 3 I The carbon to nitrogen ratio may be as high as 35:1 for plantings composed <br /> PROP. \ o tl II entirely of plants native to the Puget Sound Lowlands region. <br /> DUPLEX Sp I I �' b. Calculated amendment rates may be met through use of composted material <br /> meeting(a.)above;or other organic materials amended to meet the carbon to z <br /> nitrogen ratio requirements,and not exceeding the contaminant limits identified in <br /> Table 220-B,Testing Parameters,in WAC 173-350-220. UJ <br /> 7 <br /> Implementation Options: J Z <br /> r II`IIO <br /> The soil quality design guidelines listed above can be met by using one of the methods listed r IJ <br /> below: r^ v J <br /> I_ .`1•P.R.CP:.•d"! I m 1. Leave undisturbed native vegetation and soil,and protect from compaction during V J <br /> .i.5HARE-0.. 1 ! - construction. Z <br /> at.BRIVEWAY:/ ` 2. Amend existing site topsoil or subsoil either at default"pre-approved"rates,or at <br /> I. < custom calculated rates based e n tests of the soil an amendment. <br /> t <br /> do o d <br /> :I• , % 3 <br /> 3. Stockpile existingtopsoil du grading,p ring gr ng,and replace it prior to planting.Stockpiled <br /> topsoil must also be amended if needed to meet the organic matter or depth <br /> AREA 'A' .. � '/ o,I P g eP <br /> � . <br /> 10,917 SF requirements,either at a default"pre-approved"rate or at a custom calculated rate. <br /> 4. Import topsoil mix of sufficient organic content and depth to meet the requirements. <br /> VI \ More than one method may be used on different portions of the same site.Soil that already <br /> meets the depth and organic matter quality standards,and is not compacted,does not need to LLI o iN oo <br /> a <br /> W — _ _ be amended. Q W a rn <br /> �Qoto <br /> ..i.�.�': •..4, 1 = I - NOTE: O ui ui <br /> AMEND SOIL FOR DISTURBED,GRADED N N <br /> \ _—— ———— 1• r'. ,' a Ia OR COMPACTED AREAS ONLY. F-W <br /> RaP `• LEGEND (SEE NOTES) >W <br /> 't S ARE'D.. . ? TI 1 p> <br /> t I N AREAW <br /> r RLVZWA:Y. . A AREA B N <br /> 5 9q a BASIC SOIL AMMENDMENT ❑ UNCOMPACTED, UNGRADED, <br /> / .•� /': 3 1 UNDISTURBED <br /> RIM=541.19 <br /> \ a IE=538.12(18"CMP N) /^ <br /> 3 \ IE=538.08(18'CMP S) v <br /> 1Z <br /> cqi) <br /> CWCW <br /> G z <br /> PROP. p' -P P W <br /> DUPLEX <br /> 3 <br /> N <br /> C <br /> I rn z <br /> C <br /> CB Tv1 l 3 I d EX. FIRE �\ y O <br /> RIM=540.4( ) I a HYDRANT �(�-') A I J N N Q <br /> IE=53711 18 CMP N W �i 1 V <br /> IE=537.44 18"CMP S o W <br /> t- I CB N1 z F 0 W <br /> - � 'E'= <br /> IM=540.69 ; F Z <br /> .. E=538.69(12'CPP N,S) W LU W Q <br /> IE=538.98(6"PVC E) W U) 2 <br /> 0 20 40 W <br /> O LL O � <br /> L LL <br /> HORIZONTAL SCALE = O ZO Z <br /> U O N <br /> U Q- <br /> -&004 <br /> -17-1004 �B AW <br /> ,E. 5/30/18 <br /> CALL 48 HOURS E 1"=20' <br /> BEFORE YOU DIG <br /> 811 rya 7 7 <br />