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<br /> SECTION 34 TO�NNSHIP 29 N , RANGE 4 E , �N . M . � Z
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<br /> BASIC SOIL AMENDMENT NOTES a
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<br /> � � Soil retention. Retain, in an undisturbed state, the duff layer and native w
<br /> topsoil to the maximum extent practicable. In any areas requiring grading 0 �
<br /> '� remove and stockpile the duff layer and topsoil on site in a designated,
<br /> � controlled area, not adjacent to public resources and critical areas, to be
<br /> ; reapplied to other portions of the site where feasible.
<br /> CINDER � Soil quality. All areas subject to clearing and grading that have not been W
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<br /> wA�� Ex DR�vEwAY � ` covered by impervious surface, incorporated into a drainage facility or f-
<br /> ,I � �
<br /> engineered as structural fill or slope shall, at project completion, p
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<br /> � � '� �.,�•e. ��� HOUSE �' �'' , � � � �
<br /> '�� �� �_ 0r ' ��� � � � i demonstrate �he following:
<br /> ' �. ,
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<br /> .AREA 'A' � '
<br /> �' � � X � a
<br /> � �. � ���� ��� . �-��13�980 SF � � � ` w,� 1. A topsoil layer with a minimum organic matter content of 10% dry �
<br /> � �
<br /> : I� �� �` �� weight in
<br /> �� . N 89'00.44„ E 2 i 9.04� , � .
<br /> �� k ' ' planting beds, and 5% organic matter content in turf areas, and a pH from '�
<br /> ' � ' ` 6.0 to 8.0 or matching the pH of the undisturbed soil. The topsoil layer �Y ��, �
<br /> `, ,. �t •.,� '
<br /> , ; °' ' sha h ve a m nimum dep h of eight inches exce where ree roots lim
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<br /> II a i t pt t • �� ' � �
<br /> 25� � / , -...,, the depth of incorporation of amendments needed to meet the criteria. � ;� � �°�W:
<br /> � PA � „k; v =WO✓ Subsoils below the topsoil layer should be scarified at least 4 inches with .� �: �
<br /> � w_ , some incorporation of the upper material to avoid stratified layers, where y ;�,�� e• Q
<br /> .. , �_ � � � h.,� � � asi . �
<br /> f Y ., fe 'ble �'����. .:.••'F
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<br /> a.���� �. ': �� � �� � ISP SI ��� � �� , � � � ; ��: -_. e�.� 2. Mulch planting beds with 2 inches of organic material Sp� �
<br /> `��z�� `��.. �. `, �. ` ������ �� � �' 3 Use compost and other materials that meet these o g nic content
<br /> h� .. � �.� . . requir .
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<br /> m nt •
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<br /> ° e e s
<br /> `,. ' >; - a. The organic content for `pre-approved"amendment rates can be met
<br /> � . � — only using compost meeting the compost specification for BMP T7.30:
<br /> � � �� ,��.
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<br /> � � � ells, Swales, and Planter Boxes (p.959), with the exception
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<br /> �:_ w . �
<br /> �. , . . ' PR . � � ._ 35% biosolids or manure.
<br /> iore en ion
<br /> that the compost may have up to �
<br /> ` � � z �` 3 y __ The compost must also have an organic matter content of 40% to 65%,
<br /> - - = k and a carbon to nitrogen ratio below 25: 1. � �
<br /> B � _ The carbon to nitrogen ratio may be as high as 35: 1 for plantings �� '
<br /> � � � �x � , `:, �� �` . _'`� �, '� �� composed �
<br /> - �16'
<br /> �. - o. � '' S �_ $ �._--- SS �
<br /> S � entirel of lants native to the Puget Sound Lowlands region. rn
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<br /> 46' S Z � b. Calculated amendment rates may be met through use of composted �
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<br /> ; . �; ' , � , material meeting (a.) above; or other organic materials amended to
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<br /> �� ; � , ��(
<br /> .
<br /> ` � � ""� meet the carbon to nitrogen ratio requirements, and not exceeding the `rV
<br /> " 25, ' contaminant limits identified in Table 220-B, Testing Parameters, in �
<br /> _
<br /> �. � � ;�
<br /> WAC 173-350-220. � ^,
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<br /> , � ' N '•� �'� • ':� �� ' . : *. •• ~.� ' � __ }S � ;�.' The resulting soil should be conducive to the type of vegetation to be
<br /> _..
<br /> ; �; �.. . � .• . � .�, �� � : -"" . ,��,,�,.
<br /> �
<br /> � . . . � ��� � �
<br /> . . .
<br /> . •a ,�.. . . . established.
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<br /> AR w . " . ,� .• �� � �� .�. � . ; :� Implementation Options: The soil quality design guidelines listed above can
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<br /> ( P•) 61. . .. •.�a:�� �� ' , : '�. : � _ be met by using one of the methods listed below:
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<br /> . �. � � .� a� �.' � ` � ` � 1. Leave undisturbed native vegetation and soil, and protect from � '
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<br /> � • �• � ��� ' " � � o� compaction during construction. �
<br /> ., • �.� . � . �
<br /> � W � r ' 2. Amend existing site topsoil or subsoil either at
<br /> HE �+T� , W ap--a----- � default '�re-approved°rates, or at custom calculated rates based on tests
<br /> �cu ATio Q , - � - � of the soil and amendment.
<br /> R AN E - : - � N <� '� ;� 3. Stockpile existing topsoil during grading, and replace it prior to
<br /> z � � � planting. Stockpiled topsoil must also be amended if needed to meet the � o �
<br /> N 8$s�q'34" E �7�.3C' _... __ � °
<br /> ,_ , - .
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<br /> DEAR OWS � ' � organic matter or depth requirements, either at a j N � �
<br /> �N p,� I W �o default `pre-approved"rate or at a custom calculated rate. Q 00 �"� �
<br /> U � . .
<br /> �/ � C 1 Z 4. Import topsoil mix of sufficient organic content and depth to meet the � Q � �
<br /> ' � ,: re quirements. � � c� c v
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<br /> _ = ` ' �-�---'�" _ .. �,, �� ' .�, ,<, �t; More than one method may be used on different ortions of the same site. I- � �
<br /> , �-
<br /> " . - � �w� w"�'P -- a, ,; ;.. p�pE Soil that already meets the depth and organic matter quality standards, w w �' `~
<br /> � , __ �._ ..
<br /> . € " ' . ._. � .w... .,.- ,: .
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<br /> . . _ - � and is not co acte , does not need to be amended.
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<br /> FLOW TO SECOND
<br /> ' ; ---�'"� ; � �MIN. MIN.� END CAP OR PLUG DISPERSAL TRENCH ti � '
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<br /> - �_r �,: .....
<br /> ' - I ' � . � . CLEAN OUT IF NECESSARY
<br /> � ' � � WYE FROM PIPE o W
<br /> ^ • � 4" OR 6" PERFORATED N
<br /> NOTCHED GRADE + ' 1 , 1 .
<br /> . � PIPE LAID FLAT/LEVEL TYPE I CB
<br /> BOARD 2"x2' � � � � NPE 1 CB W/SOLID W/SOLID COVER C�
<br /> NOTCHES 18" O.C. � + • � � Z
<br /> � � � COVER (LOCKING)
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<br /> . . . . � �
<br /> A . A �— �— � Z
<br /> � W �
<br /> 40' : � � W
<br /> � INFLUENT PIPE � Z
<br /> FLOW TO OTHER �
<br /> � (MAX DESIGN 0 �
<br /> � � FLOW s0.5 CFS BRANCHING CB'S Z
<br /> � � � � . . � PER TRENCH) AS NECESSARY W
<br /> TSSP AREA A AREA B , . � . . ,
<br /> STOCKPILE AND UNCOMPACTED, UNGRADED, � � � �
<br /> AMEND SOIL IF UNDISTURBED ^ � . � s
<br /> CLEAN OUT
<br /> N NECESSARY "OPTION 3�� � - �.� � : . WYE FROM PIPE � „ �
<br /> 18 o.c.
<br /> —� � 2„
<br /> PLAN � c a
<br /> NTS 2" GRADE � � � _
<br /> BOARD 2� rn � Z �
<br /> PIPE NOTCHES �-� �i� _ �
<br /> � GALVANIZED BOLTS � p.p. � 15� MAX �
<br /> ` `��� � ORKS D�,-*.. � O Q
<br /> X 1.0 1.0 W
<br /> �5%MP �MIN. MIN'1 / / � W
<br /> \�\\�\ �Y � c�
<br /> /�/�/� � � � " : /�/� " � d'
<br /> . » ��\���\���\���\�� � � � � ���\�� NOTES: DAT � � L Z
<br /> 2 x12 PRESSURE / /\/\/\/\/\ . �.• • � . . � �.� , /\/ . ..._W� � O w
<br /> . .,,, � :> ..� ..
<br /> 0 20 40 TREATED BOARD �/�\//\��/���/��/��/ : � � . .. . � /\` �• THIS TRENCH SHALL BE CONSTRUCTED ; Q
<br /> � ��������� � o � � SO AS TO PREVENT POINT DISCHARGE T r '� � U z *
<br /> HORIZONTAL SCALE Z Q �%�//\��\��\�/j���//\ : � ' : �//\ AND/OR EROSION. t W
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<br /> � � �'\��/\��/\/\ ' �� ` • � ' . •� ` ��/�� 2. TRENCHES MAY BE PLACED NO C � _
<br /> VAR I ES N i� \�//�\�//�\�//�\�//� _ � . • o �. � . �/% „ C L O S E R T H A N 5 0 F E E T T O O N E � (1) Q H
<br /> ASPHALT � M �\\���\\��/�\\��/� � .� � .� � � � .' .� � PERFORATED ANOTHER. (100 FEET ALONG � � Z O
<br /> OR CONCRETE ONLYABEI INSTAL�LED ONATHE ��\///� . ' � � �. � " . PIPE LAID FLAT FLOWLINE) W L � Z
<br /> DRIVEWAY DOWNSLOPE SIDE OF NEW ��//� �.� � + �.� � . . � + � 3. TRENCH AND GRADE BOARD MUST BE r , � � N
<br /> CO ~2, CONCRETE OR ASPHALT � � o � . . ' CLEAN (S5% FINES) LEVEL. ALIGN TO FOLLOW CONTOURS v � p
<br /> LANDSCAPING DRIVEWAY AREAS. ' � ' . � � ' 1�"-�" WASHED ROCK OF SITE. O W d
<br /> � � 4"x4� SUPPORT ^ �
<br /> � POST �. � r �.: ,� �. . 4. SUPPORT POST SPACING AS REQUIRED
<br /> DRAIN ROCK OR � = z �� . • � �� /��\\��\ BY SOIL CONDITIONS TO ENSURE
<br /> SUBGRADE MATERIAL 'co �D� � � � • � : j %���j//�� GRADE BOARD REMAINS LEVEL.
<br /> AMENDED SOIL �������\�����
<br /> REFER TO SHEET 4 NOTE: FILTER FABRIC PROJ.NO. DSN.BY:
<br /> FOR SPEC. CONTRACTOR TO ENSURE BOTTOM OF TRENCH 17-0802 CAB '
<br /> IS MINIMUM OF ONE FOOT INTO FINE SANDS. SECTION A-A
<br /> TRANSITION ZONE DETAIL NTs
<br /> NOT TO SCALE DATE:
<br /> 8/24/17
<br /> (AS NEEDED SEE NOTE ABOVE) FIGURE 3.7 NPGIS DISPERSION TRENCH SCALE: �„ = 20�
<br /> NOT TO SCALE
<br /> CALL 48 HOURS DR4WING NO.
<br /> BEFORE YOU DIG 2 2
<br /> 1-800-424-5555
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