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AREA 'A' <br />10,917 SF <br />WENIrz SP <br />SECTION 23, TOWNSHIP 28N, RANGE 4E, W.M. <br />SSMH ` <br />RIM=541.52 <br />IE=534.98 CL / <br />/ Q <br />CB TY1 I <br />RIM=540.16 <br />IE=538.43 (12" CONC <br />IE=538.34 (12" CONC <br />PRIVATE DRAINAGE IE=538.24 (18" CMP <br />EASEMENT IE=538.35 (18" CMP <br />TO BENEFIT TPN: <br />00552500003200 <br />PROP. <br />DUPLEX <br />rPso'er <br />CB rn <br />RIM=540.49 <br />IE=537.34 (18" CMP N) <br />IE=537.44 (18" CMP S) <br />in I <br />/IE=539.12 (12" CONC NE) <br />IE=538.54 (18" CMP SW) <br />i <br />d A NAV 88 � <br />i <br />IE=538.99 (12" CONC S) <br />P P <br />P <br />3 <br />m <br />a <br />o <br />D_ <br />CB TY1 <br />RIM=541.19 <br />IE=538.12 (18" CMP N) <br />IE=538.08 (18" CMP S) <br />\ P <br />- P <br />N a <br />3 <br />EX. FIRE <br />W HYDRANT <br />CB m RI <br />0 RIM=540.69 <br />IE=538.69 (12" CPP N,S) <br />IE=538.98 (6" PVC E) <br />i <br />DOE BMP T5.13 - SOIL AMENDMENT SPECIFICATIONS: <br />Soil quality. <br />All areas subject to clearing and grading that have not been covered by impervious surface, <br />incorporated into a drainage facility or engineered as structural fill or slope shall, at project <br />completion, demonstrate the following: <br />1. A topsoil layer with a minimum organic matter content of 10% dry weight in planting <br />beds, and 5% organic matter content in turf areas, and a pH from 6.0 to 8.0 or matching <br />the pH of the undisturbed soil. The topsoil layer shall have a minimum depth of eight <br />inches except where tree roots limit the depth of incorporation of amendments needed <br />to meet the criteria. Subsoils below the topsoil layer should be scarified at least 4 inches <br />with some incorporation of the upper material to avoid stratified layers, where feasible. <br />2. Mulch planting beds with 2 inches of organic material <br />3. Use compost and other materials that meet these organic content requirements: <br />a. The organic content for "pre -approved" amendment rates can be met only using <br />compost meeting the compost specification for Bioretention (BMP T7.30), with <br />the exception that the compost may have up to 35% biosolids or manure. <br />The compost must also have an organic matter content of 40% to 65D/0, and a <br />carbon to nitrogen ratio below 25:1. <br />The carbon to nitrogen ratio may be as high as 35:1 for plantings composed <br />entirely of plants native to the Puget Sound Lowlands region. <br />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 <br />nitrogen ratio requirements, and not exceeding the contaminant limits identified in <br />Table 220-13, Testing Parameters, in WAC 173-350-220. <br />Implementation Options: <br />The soil quality design guidelines listed above can be met by using one of the methods listed <br />below: <br />1. Leave undisturbed native vegetation and soil, and protect from compaction during <br />construction. <br />2. Amend existing site topsoil or subsoil either at default "pre- approved" rates, or at <br />custom calculated rates based on tests of the soil and amendment. <br />3. Stockpile existing topsoil during grading, and replace it prior to planting. Stockpiled <br />topsoil must also be amended if needed to meet the organic matter or depth <br />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 />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 <br />be amended. <br />NOTE: <br />AMEND SOIL FOR DISTURBED, GRADED <br />OR COMPACTED AREAS ONLY. <br />LEGEND (SEE NOTES) <br />AREA A ❑ AREA B <br />BASIC SOIL AMMENDMENT UNCOTURBEDD, UNGRADED, <br />UNDISTURBED <br />CALL 48 HOURS <br />BEFORE YOU DIG <br />811 <br />W <br />e <br />"" 40 <br />HORIZONTAL SCALE <br />m <br />Z <br />0 <br />a <br />U <br />W <br />W <br />W <br />Q <br />Q <br />Z <br />W <br />J W <br />Z <br />0(D <br />J <br />�/ <br />V) Q <br />I..L <br />Z <br />G <br />N 00 <br />Q 00 � <br />rn <br />�Lo <br />N <br />0 <br />L6 <br />2E v v <br />LLI > 12 <br />LU } ~ <br />w <br />N w <br />�z <br />Z <br />�0z <br />Z <br />Wrg <br />E W <br />W <br />Z <br />0 3 <br />W <br />1 <br />C <br />0- <br />Z <br />N <br />J <br />M <br />° <br />U) <br />M <br />N <br />Q <br />W <br />V <br />Z <br />W2(D <br />LU <br />w <br />�/ <br />LU <br />w <br />Q <br />Ir <br />O <br />WLL <br />U) <br />0 <br />W <br />0 <br />0 <br />Ir <br />0 <br />r2 <br />V! <br />~ <br />� <br />00 <br />N <br />_ <br />U <br />0 <br />PROD. NO. <br />DSN. BY: <br />1 7- 1004 <br />RAW <br />DAre <br />5/30/18 <br />etas: <br />1 " = 20' <br />DRAWING NO. <br />7 <br />7 <br />OF <br />