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Home My WebLink AboutSoil Resource Report - PLN General - 4/19/2021 _USDA United States A product of the National Custom Soil Resource �— Department of Cooperative Soil Survey, — Agriculture a joint effort of the United Report for NRCSStates Department of Agriculture and otherMason County, Federal agencies, State Natural agencies including the Resources Agricultural Experiment Washington Conservation Stations, and local Service participants 286 E Cronquist Rd RECEIVED APR 19 2021 615 W. Alder Street REVIEWED FOR CODE COMPLIANCE MASON COUNTY BUILDING DEPARTMENT BUILDING .....----- 0 mmwmmwwm�100 ft January 18, 2021 Preface Soil surveys contain information that affects land use planning in survey areas. They highlight soil limitations that affect various land uses and provide information about the properties of the soils in the survey areas. Soil surveys are designed for many different users, including farmers, ranchers, foresters, agronomists, urban planners, community officials, engineers, developers, builders, and home buyers. Also, conservationists, teachers, students, and specialists in recreation, waste disposal, and pollution control can use the surveys to help them understand, protect, or enhance the environment. Various land use regulations of Federal., State, and local governments may impose special restrictions on land use or land treatment. Soil surveys identify soil properties that are used in making various land use or land treatment decisions. The information is intended to help the land users identify and reduce the effects of soil limitations on various land uses. The landowner or user is responsible for identifying and complying with existing laws and regulations. Although soil survey information can be used for general farm, local, and wider area planning, onsite investigation is needed to supplement this information in some cases. Examples include soil quality assessments (hftp://www.nres.usda.gov/wps/ portal/nres/main/soils/health/)and certain conservation and engineering applications. For more detailed information, contact your local USDA Service Center (https://offices.sc.egov.usda.gov/locator/app?agency=nres) or your NRCS State Soil Scientist(http://www.nres.usda.gov/wps/portal/nres/detail/soils/contactus/? cid=nres142p2_053951). Great differences in soil properties can occur within short distances. Some soils are seasonally wet or subject to flooding. Some are too unstable to be used as a foundation for buildings or roads. Clayey or wet soils are poorly suited to use as septic tank absorption Fields. A high water table makes a soil poorly suited to basements or underground installations. The National Cooperative Soil Survey is a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local agencies. The Natural Resources Conservation Service (NRCS) has leadership for the Federal part of the National Cooperative Soil Survey. Information about soils is updated periodically. Updated information is available through the NRCS Web Soil Survey, the site for official soil survey information. The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require 2 Ite a rnative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at(202) 720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) or(202) 720-6382 (TDD). USDA is an equal opportunity provider and employer. 3 Contents Preface....................................................................................................................2 SoilMap.................................................................................................................. 5 SoilMap................................................................................................................6 Legend..................................................................................................................7 MapUnit Legend..................................................................................................8 MapUnit Descriptions..........................................................................................8 MasonCounty, Washington............................................................................ 10 Ab—Alderwood gravelly sandy loam, 8 to 15 percent slopes..................... 10 4 Soil Map The soil map section includes the soil map for the defined area of interest, a list of soil map units on the map and extent of each map unit, and cartographic symbols displayed on the map. Also presented are various metadata about data used to produce the map, and a description of each soil map unit. 5 a Custom Soil Resource Report a Soil Map IP 512970 5129e0 512990 513000 513010 513020 513030 513M 513050 513090 513070 513080 47°W5VN 4r WWN H O 47'717 57'N 47°XY 57'N 512970 5129e0 51M 513000 513010 5130M 513030 513M 513090 513060 513070 513080 3 ; Map Scale:1:528 if printed on A tan9c-ape(I I"x 8.5")sheet Meters � N 0 5 10 20 310 Feet 0 25 50 10D 1 Map projection:Web Merehx Comero3orrinetes:MS84 Edge tics:UTM Zone 1ON WG58 3 6 Custom Soil Resource Report MAP LEGEND MAP INFORMATION j Area of Interest(AOI) Spoil Area The soil surveys that comprise your AOI were mapped at Area of Interest(AOI) 1:31,700. Stony Spot Soils Very Stony Spot Soil Map Unit Polygons Warning: Soil Map may not be valid at this scale. Wet Spot . . Soil Map Unit Lines Enlargement of maps beyond the scale of mapping can cause Other misunderstanding of the detail of mapping and accuracy of soil � Soil Map Unit Points g PP g y ,- Special Line Features line placement. The maps do not show the small areas of Special Point Features contrasting soils that could have been shown at a more detailed t> Blowout Water Features scale. Streams and Canals Borrow Pit Transportation Please rely on the bar scale on each map sheet for map Clay Spot Rails measurements. +-�-+ Q Closed Depression Interstate Highways Source of Map: Natural Resources Conservation Service Gravel Pit US Routes Web Soil Survey URL: Gravelly Spot Coordinate System: Web Mercator(EPSG:3857) Major Roads Landfill Local Roads Maps from the Web Soil Survey are based on the Web Mercator Ij A. Lava Flow Background projection,which preserves direction and shape but distorts distance and area.A projection that preserves area,such as the Marsh or swamp Aerial Photography Albers equal-area conic projection,should be used if more l Mine or Quarry accurate calculations of distance or area are required. O Miscellaneous Water This product is generated from the USDA-NRCS certified data as ® Perennial Water of the version date(s) listed below. Y Rock Outcrop Soil Survey Area: Mason County,Washington + Saline Spot Survey Area Data: Version 16,Jun 4,2020 . . Sandy Spot Soil map units are labeled(as space allows)for map scales 4W Severely Eroded Spot 1:50,000 or larger. Sinkhole Date(s)aerial images were photographed: Apr 1,2016—Sep 27, Slide or Slip 2016 oa Sodic Spot The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps.As a result,some minor shifting of map unit boundaries may be evident. 7 Custom Soil Resource Report Map Unit Legend Ma Unit Symbol Ma Unit Name A OI p y p ores in A Percent of AOI Ab Alderwood gravelly sandy loam, 0.5 100.0% 8 to 15 percent slopes Totals for Area of Interest 0.6 100.0% Map Unit Descriptions The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Other minor components, however, have properties and behavioral characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data.The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or landform segments that have similar use and management requirements. The delineation of such segments on the map provides sufficient information for the development of resource plans. if intensive use of small areas is planned, however, onsite investigation is needed to define and locate the soils and miscellaneous areas. 8 Custom Soil Resource Report An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Soils that have profiles that are almost alike make up a soil series. Except for differences in texture of the surface layer, all the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series.The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha-Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha-Beta association, 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example. 9 Custom Soil Resource Report Mason County, Washington Ab—Alderwood gravelly sandy loam, 8 to 15 percent slopes Map Unit Setting National map unit symbol: 2t626 Elevation: 50 to 800 feet Mean annual precipitation: 20 to 60 inches Mean annual air temperature: 46 to 52 degrees F Frost-free period: 160 to 240 days Farmland classification: Prime farmland if irrigated Map Unit Composition Alderwood and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Alderwood Setting Landform: Ridges, hills Landform position (two-dimensional): Shoulder Landform position (three-dimensional): Nose slope, talf Down-slope shape: Linear, convex Across-slope shape: Convex Parent material. Glacial drift and/or glacial outwash over dense glaciomarine deposits Typical profile A - 0 to 7 inches: gravelly sandy loam Bw1- 7 to 21 inches: very gravelly sandy loam Bw2-21 to 30 inches. very gravelly sandy loam Bg -30 to 35 inches: very gravelly sandy loam 2Cd 1 -35 to 43 inches: very gravelly sandy loam 2Cd2-43 to 59 inches: very gravelly sandy loam Properties and qualities Slope: 8 to 15 percent Depth to restrictive feature:20 to 39 inches to densic material Drainage class: Moderately well drained Capacity of the most limiting layer to transmit water(Ksat): Very low to moderately low (0.00 to 0.06 in/hr) Depth to water table: About 18 to 37 inches Frequency of flooding: None Frequency of ponding: None Available water capacity: Very low (about 2.7 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4s Hydrologic Soil Group: B Forage suitability group: Limited Depth Soils (G002XN302WA), Limited Depth Soils (G002XS301 WA), Limited Depth Soils (G002XF303WA) Other vegetative classification: Limited Depth Soils (G002XN302WA), Limited Depth Soils (G002XS301 WA), Limited Depth Soils (G002XF303WA) 10 Custom Soil Resource Report Hydric soil rating: No Minor Components Indianola Percent of map unit: 5 percent Landform: Eskers, kames, terraces Landform position (three-dimensional): Tread Down-slope shape: Linear Across-slope shape: Linear Hydric soil rating: No Everett Percent of map unit: 5 percent Landform: Karnes, eskers, moraines Landform position (two-dimensional): Shoulder, footslope Landform position (three-dimensional): Crest, base slope Down-slope shape: Convex Across-slope shape: Convex Hydric soil rating: No Shalcar Percent of map unit: 3 percent Landform: Depressions Landform position (three-dimensional): Dip Down-slope shape: Concave Across-slope shape: Concave Hydric soil rating: Yes Norma Percent of map unit.2 percent Landform: Depressions, drainageways Landform position (three-dimensional): Dip Down-slope shape. Concave, linear Across-slope shape: Concave Hydric soil rating: Yes 11 Short Form Construction Stormwater Pollution Prevention Plan (SWPPP) Section 1 —Project and Contact Information Project Name/Description Weldon Garage Contact/Owner Linda Weldon _ Phone number (253) 686-1460 Erosion Control Supervisor TBD Phone number Emergency(after hour)contact Linda Weldon Phone number (253)686-1460 Section 2 —Site Information Site address 286 E. Cronquist Rd.,Allyn, WA 98524 Parcel# 1 2232-40-01 1 40 v i� Soil type Alderwood Gravelly Sandy Loam (HSG B) For County Use Only: County Permit No. Review Date Reviewer Sec~o�3-�El� ibility for Abbreviated Drainage P ort Form SWPPP Have you revie ume I, Chapter 3 to mifiriz that your project is eligible to u reviated Drainage Plan? YES NO Section 4 - Project Narrative The proposal is to construct a detached garage on a developed±0.54-acre parcel off E. Cronquist Rd. on Puget Sound. All existing improvements(e.g.house, sheds, garage,septic,well)will remain. Access will be taken from an existing driveway off Cronquist Rd. Downspouts from the roof gutters will be sheet flow dispersed (BMP T5.10B and/or T5.11). The majority of stormwater runoff from the subject parcel is collected in catch basins and tightlined to Puget Sound. Stormwater runoff from the proposed roof and approximately one-half of the driveway area will also be collected and tightlined to Puget Sound. Stormwater runoff from the other half of the driveway area will be sheet flow dispersed. See Minimum Requirement#5 below for additional information. All disturbed, new lawn and landscape, and stormwater dispersion areas will contain soils meeting the Post-Construction Soil Quality and Depth (BMP T5.13) requirements. Project Description (check all that apply) Project Type Subdivision, Type Single Family Residential Project(building ermit ✓ Large Lot >2.5 acres Grading Permit Commercial Development Land Clearing Conversion of native vegetation to landscaping or pasture Other Project Areas Total site area 23,522 SF What is the area of land disturbance? 5,100 SF Area of existing impervious surfaces 4,965 SF Area of new impervious surfaces 3,700 SF Total area of new, replaced,and existing impervious 8,500 SF surface after project improvements Area of existing native vegetation to be converted to 0 SF landscaping or pasture Will there be stormwater runoff or sediment discharges to YES ✓] NO adjoining ro erties or waters of the U.S. from the site? If a grading permit is required, what is the total volume of CY grading? Additional Project Information (attach additional sheets if necessary) Existing Site Conditions 1. What existing vegetation is present on the site? (check all that apply) EXIST? % of Description (y/N) Total Area Forest Y Pasture/prairie grass N Pavelnuilt Lawn/landscaping Lawn/landscaping Y 99 Brush N Deciduous Trees N Other N 2. How does surface water drainage flows across/from the site? (check all that apply) Sheet flow/dispersion with runoff from site ✓ Sheet flow/dispersion no runoff from site Infiltration—no surface drain Le leaving site Ditch/swale Stream Storm Sewer/catch basin or inlet ✓ Other 3. Which of the following site condition(s)or other features of note are present on the site (indicate their location on site map)? Steep slopes >20% ✓ Large depression Underground tanks ✓ Springs/Seeps Easements Existing structures Existing utilities ✓ Existin Waters of the State (pond, stream,creek, river,etc. Other Adjacent Areas 1. Which of the following adjacent areas could be impacted by site disturbance? Streams Lakes Wetlands Steep slopes Residential Areas ✓ Roads Ditches, pipes,culverts ✓ Marine Bluff Other Puget Sound ✓ 2. Describe the downstream drainage path leading from the site to the receiving body of water. (Minimum distance of/4-mile (1,320 feet)) {e.g., water flows from site, into curb-line to catch basin at intersection of X and Y streets. A 10-inch pipe system conveys water another 1,000 feet to a ravine/wetland.} (attach additional sheets if necessary). Stormwater runoff from the proposed root and driveway areas will be conveyed through approximately 130 LF of 6"diam. pipe to Puget Sound. Section 5 — Abbreviated Erosion Control Plan Enter estimated start/end dates for the following construction activities/milestones: Construction Schedule Estimated Start/End Date 1. Permit obtained(start date) Unknown 2. Mark clearing limits Unknown 3. Establish construction access Unknown 4. Install sediment controls Unknown 5. Demolition Unknown 6. Grading Unknown 7. Utility construction Unknown 8. Building or structure construction Unknown 9. Landscaping/final site stabilization Unknown Complete Checklist for all Projects Element/ Description Requirement Applicable BW(s)' Confirmation Preserve Prior to beginning land-disturbing BW C100:Preservation Will comply 0 Vegetation/Mark activities,mark clearing limits and of Native Topsoil(On-site) N/A(explain): Clearing Limits delineate sensitive areas and their BW C101:Preserving buffers with high visibility fence. Natural Vegetation Retain the native top soil and duff BW C102:Buffer Zones layer or stockpile it on-site for BUT C103:High Visibility replacement at completion of the Plastic Fence project BUT C233:Silt Fence Establish Provide stabilized construction BW C105:Stabilized Will comply❑ Construction entrance(e.g.,quarry spalls or Construction Entrance N/A(explain): Access crushed rock);clean public roads if P BW C106:Wheel Wash Utilize existing any sediment is transported off site. BW C 107:Construction gravel driveway If an existing driveway will be used Road/Parking Area for construction access,describe Stabilization. condition and show on Site Plan.If stabilized construction entrance is not effective use wheel wash or tire baths located on site. Control Flow Protect downstream properties and BW C203:Water Bars Will comply Rates waterways from discharge of turbid BW C207:Check Dams N/A(explain): water.Provide flow control if BW C209:Outlet required(MR#7). Protection BMP C235:Wattles BMP C240:Sediment Trap Volumes III&V for sizing infiltration and detention facilities. Install Sediment Provide suitable sediment control BMP C231:Brush Barrier Will comply JO Controls BMPs to prevent sediment from BW C232:Gravel Filter N/A(explain): leaving site. Berm BMP C233:Silt Fence BW C234:Vegetated Strip BUT C235:Wattles BUT C240:Sediment Trap Element/ Description Requirement Applicable BMP(s)' Confirmation Stabilize Soils Stabilize all unworked and exposed BMP C120:Temporary Will comply E soils to prevent erosion. and Permanent Seeding N/A(explain): From October 1 through April 30,no BMP C 121:Mulching soils shall remain exposed and un- BMP C 122:Nets and worked for more than 2 days. From Blankets May 1 to September 30,no soils shall BMP C123:Plastic remain exposed and un-worked for Covering more than 7 days. BMP C124:Sodding BMP C125:Topsoiling/ Composting BMP C 130: Surface Roughening BMP C 131:Gradient Terraces BMP C 140:Dust Control Protect Slopes Design and construct cut and fill BMP C 120:Temporary Will comply❑ slopes to minimize erosion. and Permanent Seeding N/A(explain): BMP C 121:Mulching No slopes in BMP C 122:Nets and project area Blankets BMP C130: Surface Roughening BMP C200: Interceptor Dike and Swale Protect Drain Protect conveyance system from BMP C220:Storm Drain Will comply Inlets sediment by providing filtration of Inlet Protection N/A(explain): stormwater prior to entering inlets. Stabilize Stabilize channels and outlets to BMP C202:Channel Will comply❑ Channels and prevent erosion. Lining N/A(explain): Outlets BMP C207:Check Dams No channels or BMP C209:Outlet outlets Protection Control Handle and dispose of construction BMP C151:Concrete Will comply Pollutants debris in dumpster or by hauling to Handling N/A(explain): waste transfer station so that it does BMP C152:Sawcutting not contaminate stormwater. and Surfacing Pollution Prevention BMP C 153:Material Delivery,Storage and Containment BMP C 154:Concrete Washout Area Control Manage dewatering water from BMP C203:Water Bars Will comply Dewatering construction activities to prevent BAP C236:Vegetative NIA(explain): sediment discharge from site. Filtration Manage highly turbid dewatering water separate from stormwater. Element/ Description Requirement Applicable BMP(s)' Confirmation Maintain BMPs Maintain BMPs to insure continued BMP C150:Materials On Will comply 12 function. Hand N/A(explain): BMP C 160:Certified Erosion and Sediment Control Lead Manage the Phase the project to avoid soil BMP C150:Materials On Will comply 10 Project disturbance from Oct. 1 through Hand N/A(explain): April 30 if possible. BMP C 160:Certified Modify BMPs if not effective or to Erosion and Sediment meet changed conditions. Control lead BMP C 162:Scheduling Protect Low Protect all bioretention,rain garden, BMP C102:Buffer Zone Will comply❑ Impact and porous pavement BMPs from BMP C 103:High Visibility N/A(explain): Development sedimentation through installation Fence LID BMP's not BMPs and maintenance of erosion and BMP C200:Interceptor ro sed sediment control BMPs for areas that P Dike and Swale drain to the bioretention,rain garden or porous pavement BMPs. BMP C201:Grass Lined Channels BMP C207:Check Dams BMP C208:Triangular Silt Dike BMP C231:Brush Barrier BMP C233: Silt Fence BMP C2234:Vegetated Strip i Descriptions of BMPs designated can be found in Volume lI of the DDECM. s R E C E I V L SEC 32, TWP 22N, RGE 1 W, W.M. VICINITY MAP N.T.S. $ APR 19 zn?, PLANNING 615 W. A' REPLACE EXISTING YARD DRAIN WITH MIN. 18'x18' E CRONCUIST RE) GRADE DRIVEWAY TO DRAIN TO NEW/REPLACED 'i M CONSTRUCT DRIVEWAY PER OWNER. PROVIDE MIN. CATCH BASIN CATCH BASIN (SEE CATCH BASIN NOTE). INSTALL 8'0 PVC TIGH1llNE 10 NEW 8' ROOF DRAIN PIPE MAINTAIN A MINIMUM 25' NATIVE VEGETATIVE STRIP 10' WIDE ON-SITE VEGETATED STORMWATER REMOVE EXISTING CATCH BASIN AND AS SHOWN. EXISTING STORM PIPE TO THE SOUTH (BMP C234) BETWEEN THE PROJECT AREA AND DISPERSION AREA (BMP T5.12) ADJACENT TO AND ASSOCIATED PIPE AS NEEDED TO BE ABANDONED. DOWN-SLDPE PROPERTY LINES AND CRITICAL / E DETROIT DR DOWN-SLOPE OF DRIVEWAY PER DETAIL ON SHEET AREAS DURING CONSTRUCTION OR INSTALL SILT 2. GRADE DRIVEWAY AS NEEDED TO ALLOW INSTALL 6'e PVC FROM EXISTING FENCING(BMP C233) PER DETAIL ON SHEEP 2 IF Q� STORMWATER RUNOFF TO UNIFORMLY SHEET FLOW OFF ONTO THE DISPERSION ARFA(S). STORM PIPE TO NEW/REPLACED THE 25' VEGETATIVE STRIP WIDTH CANNOT BE o CATCH BASIN AS SHOWN. ACHIEVED/MNNTNNED. DOUGLASFIR UN n EXISTING GRAVEL DRIVEWAY TO BE UTILIZED AS A TEMPORARY CONSTRUCTION ENTRANCE (BMP C105). CLEARING/GRADING LIMITS / (APPROX t5,100 SF) p , ti5� ti� PROJECT INFORMATION PROPERTY uNE y OWNER/APPLICANT: LINDA WELDON t J PO BOX 653 i K.. / SPANAWAY, WA 98387 ®� so - _ - 12232-40-01140 z i GRAVEL DRIVEWAY \ $ / / jl� / PARCEL N0: zSD . _ v6/ SMED TAHK l 286 E. ORO f,M° / SITE ADDRESS: ALLYN, WA 98524T RD j O J K�/ l / RR5 ZONING: ( ; 6 SD CQNC. _ _ t0.54 ACRES t23,522 SF) (PER sd---- / PARCEL AREA: MASON COUNTY)PAn''wAso $ / $ o y SOILS: A OAMW(HOS B)AVELY SANDY �, IFEMA FIRM DESIGNATION: ZONE#53 A OSOS( NEL uj E-14' 1=GARAGE CONC. a HOUSE c� fPROPOSED zl/ If , s z GARAGE / $ / I , EXISTING HARD SURFACE AREAS: G zz I L-J DRIVEWAY: t2,360 SF t 0 > JSHED t1,520 SF �e'• CONG ^'ISC.: 31 085 SF F-W d-�—ID 4 e ID RD Sp e'o m w e'� SDTOTAL: 4,965 SF IY�, fA d / PROPOM uNE / NEW/REPLACED HARD SURFACE AREAS: _ z IL / oo'PROTECTIVE q0, WELL RAIMUS—� ,300 ROOF: 1 SF t 3 �- DRIVEWAY: 7 400 SF / TOTAL: 3,700 SF pCC J TOTAL HARD SURFACE AREAS AFTER PROJECT COMPLETION: II... G Cc d / 3,660 SF z ROOF: 3,920 SF G HOUSE DRIVEWAY: V CONC./Ml= 920 S TOTAL: 8.500 SF INSTALL 8'0 CLEANOUT AT PIPE ANGLE SET REMOVABLE CAP TO GRADE. 36%HARD SURFACE COVERAGE R N INSTALL ROOF DRAIN PIPES AS SHOWN. MIN. PIPE SLOPE-0.02 FT/FT. COORDINATE DOWNSPOUT REPLACE EXISTING STORM PIPE WITH 6'e PVC. LOCATIONS PATH BUILDING CONTRACTOR. PROVIDE SOIL AMENDMENT AREA 1 RE-CONNECT DOWNSPOUTS WHERE APPLICABLE. L) N MIN. 12' COVER OVER PIPE (ALL DISTURBED AREAS INCLUDING RESTORE ALL DISTURBED AREAS IN-KIND OR AS SURVEY NOTE LAWN/LANDSCAPE AREAS AND STORMWATER PER OWNER. DISPERSION AREAS) THE BOUNDARY AND TOPOGRAPHIC SURVEY INFORMATION DEPICTED HEREON WAS OBTAINED FROM MASON COUNTY m m RECORDS. PROPERTY LINES, STRUCTURES, SITE FEATURES, z 'm INSTALL SILT FENCING (BMP C233) ALONG SOUTH ELEVATIONS, ETC. SHOWN MAY BE APPROXIMATE. THIS SURVEY PROPERTY LINE AND AS NEEDED TO PREVENT INFORMATION WAS NOT FIELD VERIFIED BY OLYMPIC u, o SEDIMENT RUNOFF FROM THE PROJECT AREA PER ENGINEERING AND OLYMPIC ENGINEERING ASSUMES NO LIABILITY DETAIL ON SHEET 2. IN THE ACCURACY OF THIS INFORMATION OR FOR OMISSIONS WHICH MAY HAVE BEEN INCORPORATED INTO THESE DRAWINGS ry1ry01 / AS A RESULT. THE PROPERTY LhES SHOULD BE MARKED BY A ti) BNER M, 1-- ;7 � VEGETATED STORMWATER PROFESS,ONAL LAND SURVEYOR PRIOR DISPERSION AREA START. h POST—CONSTRUCTION SOIL QUALITY AND EROSION CONTROL .m DEPTH (BMP T5.13) SPECIFICATIONS RECORD DRAWING (AS—BUILT) NOTE PERMIT APPROVAL DURATION IN ADDITION TO THE BEST MANAGEMENT PRACTICES (BMP'S) s+a A I NEW t ewN AND ANOct`AaF AR e I DI RB D THE WORK DEPICTED HEREIN SHALL BE ACCOMPLISHED IN OLYMPIC ENGINEERING MAY BE REQUIRED BY MASON COUNTY IT IS THE SOLE RESPONSIBILITY OF THE OWNER AND/OR SPECIFIED ON THIS PLAN, '�TRACTOR S AI I MINIMIZE ARf c TO R TOR D TO hATIV V TATION AND ALL ACCORDANCE WITH MASON COUNTY STANDARDS AND THE TO PROVIDE RECORD DRAWINGS AS-BUILTS) PRIOR TO FINAL APPLICANT TO KEEP TRACK OF THE DURATION OF PERMIT CJ FARING AND GRADING, MAINTAIN THE BMP'S UNTIL FINAL SITE STORMWATER Dlca R ION AR - MUST CONTAIN SOILS THAT STANDARD SPECIFICATIONS FOR ROAD, BRIDGE AND MUNICIPAL PROJECT APPROVAL. OLYMPIC ENGINEERING WILL NOT PREPARE APPROVAL. OLYMPIC ENGINEERING DOES NOT MONITOR THESE STABILIZATION, AND INCORPORATE ANY ADDITIONAL BMP'S AS MEAT THE 'POST-GONcTRU-TION cO 011_AIiTY AND DEPTH' CONSTRUCTION, 2020, INCLUDING ANY AMENDMENTS, AS ISSUED THE RECORD DRAWINGS UNLESS WE HAVE INSPECTED ACTUAL TIME FRAMES AND ASSUMES NO RESPONSIBILITY IN EXPIRED NECESSARY TO MINIMIZE EROSION AND SEDIMENTATION DURING 1 (BMP 15.11) RFOUIRFMENTS HYDROSEED AND/OR MULCH AND BY THE WASHINGTON STATE DEPARTMENT OF TRANSPORTATION INSTALLATION OF THE NEW IMPROVEMENTS AND ALL OF THE PERMITS. CONSTRUCTION. SEE VOLUME II OF THE WSDOE 2014 E PLANT ALL DISTURBED AREAS IMMEDIATELY AFTER REACHING (WSDOTJ. IMPROVEMENTS HAVE BEEN CONSTRUCTED PER PLAN OR AS STORMWATER MANAGEMENT MANUAL FOR WESTERN WASHINGTON I FINAL GRADE. FOR ADDITIONAL BMP'S THAT MAY BE APPLICABLE. N 3 n 1 OTHERWISE APPROVED. ADDITIONALLY, OLYMPIC ENGINEERING THE CONTRACTOR IS RESPONSIBLE FOR PROVIDING ALL LABOR, ASSUMES NO LIABILITY IN THE PERFORMANCE OF THE CATCH BASINS / YARD DRAINS IT IS HIGHLY R -�1��cNnFn T};AT NATIV VEGETATION AND MATERIALS, TOOLS, EQUIPMENT, TRANSPORTATION, SUPPLIES, IMPROVEMENTS IF WE HAVE NOT INSPECTED INSTALLATION OF ALL CATCH BASINS AND YARD DRAINS ADS NYLOPLAST OR SOIL REMAIN UNDIc IRBFD AND PROTECTED FROM COMPACTION AND INCIDENTALS REQUIRED TO COMPLETE ALL WORK SHOWN THE IMPROVEMENTS. DURI�N. CONSTRUCTION (IMPLEMENTATION 'OPTION 1') TO THE ON THESE DRAWINGS AND TO OBTAIN ACCEPTANCE BY MASON ( SEASONAL WORK LIMITATIONS MAXIMUM EX NT PRACTICALCOUNTY, DESIGN ENGINEER, AND PROJECT OWNER. EQUAL) SHAG HAVE: VERTICAL TEE INSTALLED ON THE OUTLET o 2 o 0 PIPE; A MINIMUM 12' SUMP DEPTH; MINIMUM 12' PIPE COVER; FROM OCTOBER 1 THROUGH APRIL 30, CLEARING, GRADING, AND S o SOURCE OF FILL MATERIAL AND GRATES/LIDS SET TO FINISHED GRADE. COORDINATE ANY OTHER SOIL DI IT BE DEMONSTRATED ACTIVITIES ARE NOT THAT SILT-LADEN RUNOFF ARE AS SOIL AMENDMENT NO LOWS:AREAS AND RECOMMENDED IMPLEMENTATION WORK. OMISSIONS FROM THE DRAWINGS OF DE INTENT OF THESE DRAWINGS IS TO ETAIL OF IBE ACWORK ANY REWIRED FILL MATERIAL WILL BE OBTAINED FROM YARD DRAIN LOCATIONS WITH OWNER AND/OR LANDSCAPE UNLWILL BE PREVENTED FROM LEAVING THE SITE AND WITH PRE- �p CONTRACTOR. WHICH ARE NECESSARY TO CARRY OUT THE INTENT OF THE ON-SITE AND/OR FROM APPROVED OFF-SITE SOURCES TO BE AUTHORIZATION FROM MASON COUNTY. 2 z _ AREA 1: ALL DISTURBED AREAS INCLUDING LAWN/LANDSCAPE DRAWINGS SHALL NOT RELIEVE THE CONTRACTOR FROM DETERMINED. PROVIDE INLET PROTECTION (BMP C220) IN CATCH BASINS WITH 1 AREAS AND STORMWATER DISPERSION AREAS - USE PERFORMING THE OMITTED WORK. GRATES PER DETAIL ON SHEET 2 AND MAINTAIN UNTIL FINAL STORMWATER RUNOFF W 'OPTION 4' - APPROX. 30 CY OF TOPSOIL k 10 CY SITE STABILIZATION. Z 'O MULCH - USE APPROX. 30 3' IF NATIVE SOIL MEETS ANY PROPOSED ALTERATIONS BY THE CONTRACTOR AFFECTING HARD SURFACE AREA NOTE STORMWATER RUNOFF FROM NEW HARD SURFACES (ROOFS, THE REQUIREMENTS. THE REQUIREMENTS AND INFORMATION IN THESE DRAWINGS DRIVEWAYS, ETC.) SHALL NOT BE DIRECTLY DISCHARGED TO i7 SHALL BE IN WRITING AND WILL REQUIRE APPROVALOF THETHE TOTAL OF NEW AND/OR REPLACED HARD SURFACE AREA EXISTING STORM PIPE NOTE NEIGHBORING PROPERTIES OR TO MASON COUNTY RIGHT-OF- SEE 'POST-CONSTRUCTION SOIL QUALITY AND DEPTH DESIGN ENGINEER AND MASON COUNTY (ROOF, DRIVEWAY, ETC.) CANNOT EXCEED 10,000 SF WITHOUT WAY. DESIGN WORK AND ADDITIONAL REVIEW AND APPROVAL BY THE SIZES AND CONDITION O= EXISTING STORM PIPES SHOWN Uo2=UMBER: — SHEETGUIDE 2ESO AND 'SQL AMENDMENT SECTION' DETAILS ON MASON COUNTY. OR NOT SHOWN, ARE UNKNOWN. SHEET 2 FOR REFERENCE. SHEET INDEX DRAWING NAME- SCALE: 1 INCH 30 FEET 1 DRAINAGE AND CONSTRUCTION STORMWATER POLLUTION 20058 DRPL PREVENTION (SWPPP) PLAN "CALL UNDERGROUND LOCATE AT 811 BEFORE YOU DIG" 0 15 30 60 2 DETAILS AND NOTES SHEET. 1 , SEC 32, TWP 22N, RGE 1 W, W.M. POST-CONSTRUCTION SOIL QUALITY AND DEPTH (T5.13) GUIDELINES STANDARD CONSTRUCTION SWPPP NOTES PLANTING TURF(LAWN) See'Guidelines and Resources for Implementing Sod Quality and Depth'BMP T5.13 in the WSDOE'2014 Approval of this Construction SWPPP does not constitute an approval of permanent road or BEDS AREAS FILTER FABRIC MATERIAL 60' GRASS SEED OR SOD Stormwater Management Manual far Western Waahingtn'. This document Is available at no charge from the drainage design(e.g..size and location of roads,pipes,restrictors,chnnel%retention/ WIDE ROLLS USE STAPLES OR 2•ydtBOR15T,�� following web sites: "ww.SoilsforSalm-.mg>and<www.Bunding5od.org>.Also see'Soil Amendment Section" deteatlon/Inflltratfn facilities,utilities,etc.). HIRE RINGS TO ATTACH FABRIC CHIP MULCH 0' S doted.this sheet for reference. _ __ _ _ TO WIRE.vWMTS IN FILTER _ Soil Retention The implementation of this Construction SWPPP and the construction,maintenance, FABRIC SHALL BE SPLICED AT 2'x 2'x 14 Ca N/RE __________ _______ replacement,nd upgrading of these Construction SWPPP facilities is the responsibility of the POSTS FABRIC OR EQUIVALENT,IF 3'OF IMPORTED =___-__ -_____-_ 1-3/4.OF IMPORTED applicant contracts until all construction Is completed and STANDARD STRENGTH _------- ------- COMPOST TILLED INTO / D approved and COMPOST TILLED The duff layer and native topsoil Mould be move in stockpile u t e d state to the maximum extent FABRIC USED ------- ------- 5'OF EXISTING SQL desig ated..c any orwe requiring grading remove and urcen the duff layer and topsoil-site in a vegetation/landwaping Is established. INTO 5T OF EXISTING =_- ___ Omignated,controlled ores,not adjacent to public resources and critical areas,to be reapplied to other � SOIL(8'TOTAL DEPTH) ___________ _______ _ (8'TOTAL DEPTH) portions of the it.when.feasible. The boundaries of the clearing limits Mown on this pion shall be clearly flogged In the fWd ------- ------_- prior to eonts shall During the one flog in paned,no maintained beyond the flagged 2'MIN. SUBSOIL SCARIFIED 4' ------- - _----_ SUBSOIL SCARIFIED 4" Soil Quality clearing Iknita shall be permitted The flogging shill be maintained by the applicant/contractor BELOW COMPOST \ \\ / BELOW��T All aroma subject to clearing and for the duration of a-stroctl-. AMENDED LAYER(12" / \ AMENDED LAYER(12' Jw g grading that have not been covered by impervious surface.incorporated into Ns fa droln age facility or engineered as structural fill or dope Mall,at project completion.demonstrate The CanaWetl-SWPPP facilities Mown on this plan must be constructed in eonNnetln with VA TIES BELOW SQL SURFACE) / 12' \ BELOW SOIL SURFACE) g• all clearing and grading activities,and in such a mnner as to insure that sediment and tl07ES_ • Turf am.: An amended sod Ia with an m y sediment laden water do not enter the drainage system. ys, applicable IN MIN. 4T' 4" ) yew organic matter content..e measured b the g Ys em,rwdwa ar violate a 11 ble water 18"MIN. 1. SEE'POST-CONSTRUCTION SQL QUALITY AND DEPTH(BMP TS.1J QUIDELINES'ON THIS loss---Ignitl-teat,of a minimum 4 percent(target 5 percent)organic matter content standards. SHEET FOR ADDITIONAL INFORMATION. • Planting Beds. An amended sod layer with an organic content.as measured by the 8,MAX 2 THE DUFF LAYER AND NATIVE TOPSOIL SHOULD BE RETAINED IN AN UNDISTURBED STATE TO i love---igniti-test of a minimum 8 percent(target 10 percent)dry weight 2 Inches of The Construction SWPPP facilities Mown w this plan am the minimum requirements for THE MAXIMUM EXTENT PRACTICAL genic mulch placed ewer the amended doll layer. anticipated site eonditlons During the construction period,toss Construction SWPPP facilities 2'x 2'HOOD POSTS,STANDARD OR BETTER 3. ThAT Y k,EE15 TH 'PTh Ar,D ERG.NIC MATTER OL�TY STANDARDS.AND OR EQUAL ALTERNATE STEEL FENCE POSTS Hris NOT rrN GOMPA.TIED DOES NOT N ED r0 B AMENDFn. < • Subsoils below the amended doll layer acarifled at Twat 4 inches with some incorporation of the shall be upgraded as needed for unexpected stem events and to ensure that sediment and 3 ppw material to avoid stratified layers. sediment-laden water do not leave the site. • The end Moll have pH frsn 6.0 to 8.0 or matching the pH of the original undisturbed soil. 2'x 2'x 14 Go HIRE • A minimum settled depth of B Incho(9.5 Inch loose depth). The CnNruetian SWPPP facilities Mall be inspected dad b the FABRIC OR Eau1v. SOIL AMENDMENT SECTION (BMP T5.13)-OP110NS #2 & #3 • The resulting end should be conducive to the type of vegetation to Da established. spec Y Y opplkant/contractor and FILTER F C NA IERIAL u N.i.S. W maintained as necessary to ensure their continued functioning. Materials The Construction SWPPP facilities an Inactive sites shall be Inspected and maintained a a Quality requirements far compost and other materials Include the following: minimum of once a month or within the 48 hours following a major storm event. LINE FILTER MATERIAL IN ^a PLANTING TURF (LAWN) cc • The organic content for'pre-opProved'amendment ratss can be mat only using compost that At no time shall more than 1 font of sediment be allowed to accumulate within a trapped MIN.6'WxBD'TRENCH. J$o V�'� BEDS AREAS meets the definition of'composted materials in WAC 173-350-220.This code is.-liable-line catch basin.MI catch basins and conveyance lines shall be cleaned prior to paving.The PROVIDE GRAVEL 7D 1 1/2' l GRASS SFfO OR SOD at http-.//app.l AC defaults ?cite 173-350-220. Owning operation shall not flush sediment laden water Into the downstream system. WASHED GRA YET.BACKFlLL u__ 2'ARBCRIST WOOD I r ag.w..gov/W / spz Ya OR NATIVE SQL CHIP MULCH 0' Z V Z • The compost must also haw a organic matter content of 35 prcent to 65 percent•and a ___-___ ___----- 0 Z carbon to nitrogen ratio below 25:1. Stabilized construction entrances Mall be installed at the beginning of construction and -____--_--_- _-__-_--_-_ aW � • Tha carbon to nitrogen ratio may be as high as 35:1 for plantings composed entirely of plants maintained for the duration of the project.Additional measures may be required to Insure 2'x 2'WOOD POST� 3"OF IMPORTED -_---_-'- ------- 3'OF IMPORTED J , U native to the Pu at Sound Lowlands region. that ill paved areas are kept dean for the duratin of the ------- _____--= TOPSOIL W 0 9 e9 p ep project ALL STEEL FENCE POSTS TOPSOIL ------- • Cdother amendment al.rates may d met through um of-posted materials as donned above; ____-___ _____ 3 6 Z or other organic materials amended to meet the tort-to nitrogen ratio requirements; _______ ______= 0 'Pre-.Pprcved'amendment rotes can only be met using compost meeting the compost SILT FENCE (BMP C233) DETAIL to epwlfl-ti-for bforet-tion(sea Section 2.2.5 of the DDECIi with the excepti-that the STANDARD STORMWATER NOTES S 3"OF IMPORTED \ / \ 3'OF IMPORTED < compost may have up to 35 percent biosdids or manure. TOPSOIL TILLED INTO �\ TOPSOIL TILLED INTO 1. All workmanship d materials shall be in accordance with Count standards and the 2"OF EXISTING SOIL 2'OF EXISTING SOIL Implementation Options p m' Y most current copy of the State of Washington Standard Specifications for Road,Bridge 8' The cull quality design guideline:listed.bow can be met by using one of the method.listed below which and Municipal Construction(WSDOT/APWA)and as amended by the County or the State. are described in detail in the Soil.for Salmon guidance document(sea Design Guidelines above): 2. Temporary wool-/water pollution Prevention measures shall be required In accordance I NOTES Leave undisturbed native with the WSDOE 2014 Stor e,cter Management Manual for Western Washingt-1 and the r_ 1. SEE'POST-CONSTRUCTION$OIL WAUTY AND DEP1H(BMP T5.13)GUIDELINES'ON THIS Qpt190_1. Vegetation and end,and protect hen compaction during construction. pept of Eedagy s Consfinetion Starmwater General Permit if applicable. ^ .-_-�•t SHEET FOR ADDITIONAL INFORMATION. Identify areas of the site that will not be stripped,logged,graded ar drives on,and tents these aroma to 2 THE DUFF LATER AND NATIVE TOPSOIL SHOULD BE RETAINED IN AN UNDISTURBED STATE TO prevent Impact,during construction(see BMPs C101,ClOO,and C103 in Volume IQ.If neither sons nor Shnld the temporary erosion and sedimentation control measures as Mown n this - �k {' THE MAXIMUM EXTENT PRACTICAL N wgetatl-one dlaWAed,these aroma do net require amendment 3. ^' PRAT A_REO<Y MEETS THE DEPTH AND ORGANIC MATTER QLW ITY eTANDARDS AND W drawing not prove adequate to control erosion and sedimentation.the HAc NOT B FTl COMPACTEn.DOES NOT NEED TO BE AMENDED. f� Option 2.Amend existing site topsoil or subsoil h place at default'preapproved'rates,or at custom applicant/contractor Mall Install additional facilities a necessary to protect adjacent 0 calculated rates based an testa of the soil and amendment Scarify or till the subgrade to a depth of 8 properties,sensitive orec%natural water courses,and/or storm drainage systems. 0v 11ovv Z Inches(or depth needed to achieve a total depth of 12 Inches of.ncompacted wall after calculated Darsty) SOIL AMENDMENT SECTION (BMP T5.13)-OPTION #4 amount of amendments are added).Amend sod to meet required organic content dependent an the use 3. Call the underground locate line 1-800-424-5555 a minimum of 48 hours prim to any G-VinlJe prr'tenh I". V.-.S. 0 and whether the pre-approved or calculated rate method Is used. excavations. `abrlc 1-4 nq) = pre-Approved Rates 4. The storm drainage system Mall be constructed according to approved plans an Ole with the County.Any significant deviation from the approved plans will require written approval from the County. 0 Planting Beds 5. A< of the roved Construction Starmwater Pollution Prevwtlon Plan and Scc.mul �- J • Place 3 Inches of compost and rototdl Into 5 Inches of soil(a total amended depth of about 9.5 spy epP acc..mulatnn inches,far a settled depth of 8 inches). Far projects plena must- re the job site whenever construction ism progress. 6. Fm projects disturbing 1-acre or more,ill erosion control nil starmw.ter facilities shall ND Pr�oNde catch basin sediment protwtfon with StreamGusd F Turf Area be regularly inspected and maintained by the designated Certifled Erosion and Sediment Sediment Catch Basin Insert,manufactured by Bowhead W Control Place 1.75 inches of compost and rototill into 6.25 inches of soil(a total amended depth of Ctrol Lead(CESCL)during construction. Environmental @ Safety,or approved equal. 0 abort 9.5 Inches far a settled depth of 8 Inches) 7. It Mall be the We responsibility of the contractor to obtain street use and other Catch basin Otters Mould be inspected frequently,especially after ,t-event..If the insert becomes dogged,it Mould be related or required shall else prior to any comity of activity ct the M basin all a cleaned m replaced Option 3.Stockpile existing topsoil during grading,and replace it prior to planting.Stockpiled topsoil must right-of-way.It Mall also bar to responsibility of to contractor to obtain ill required Do not wash sediment into storm drains while Bening.Spread a_Iw be amended If needed to meet the organic matter or depth requirement.,either at a default permit.prim to my construction.The contractor Mall abide by all requirements far all excavated material evenly over the surrounding land area and pre-approved'rate or at a met=calculated rate.If placed topsoil plus compost ar other organic traffic control h safety when warleing in the road right-of-ra, stockpile and staDOlze as appropriate. material will amount to less than 12 inches,then the subgrade will be scanned ar tiled to achieve 12 B. The Contractor shall notify the Project Engineer in the event ordiscovery of poor sods, inches of loosened soil after amendment Replace stockpiled topsoil prim to planting.Amend stockpiled standing groundwater,or severe discrepancies from soil log descriptions as noted an the topaon If needed to meet required organic content dependent n the use(Planting area or Turf)and plan.. INLET PROTECTION DETAIL N whether the preapproved or calculated rate method is used. 9. For public systems,the contractor Mall call for Inspection 48 hours prior to covering N.T.S. N Pre-Aoor,-d Rates any drainage structure. r \ 10. All drainage structures,such o,catch basins and manholes,not located within a U U = Planting Beds trawled roadway or sidewalk.Mall haw scila lacking lids,All drainage structures N • Place 3 Inches of compost and rotoUl Into 5 inches of soil(a total amended depth of about 9.5 associated with a permanent retention/detertln facility Moll haw solid locking lids inches,far a settled depth of 8 Inches). i Turf Arens Ym >r m • Plata he,of compost and roto Into 8.25 inches of sod(a total amended depth of i m w abort 9.5 9.5 inches for a wattled depth of 8 inches) m �.1 Ul < a<Qatioo 4.Import topsoilmix of suf iclwt organic content and depth to meet the requirements.Scarify orMIN.10'ON-SITE o �5 •� till subgrade in two directions to 6 inches depth.Imported done should not contain excessive day or out DISPERSION AREA flnes(more than 5 percent passing the US#200 slew)because that could restrict stormwater Infiltration. FLOW PATH 1` r we m aoil mix suitable for proposed use(planting bed s turf area).Place topGuidelines all in ). per 2' DROP FROM EDGE OF DRIVEWAY HYDROSEED OR lI N M. endatin,of Sells for Salmon guidance documents(see Design G.Idellnes bow). tiI ER Pre-Anarowd Rates: TO TOP OF SOD/GROUNDCOVER-\ LANDSCAPING(SEE NOTES) y Planting Beds MATCH TO E%.GRADE -1 • Use imported tepwl mix containing 10%organic matter(typically around 40X compost).Sod portion must be wind or dontly Isom as defined by the USDA. _ _ Z-z--� 2X PREFERRED 3r�ot • Place 3 Ponchos off 3 rtedInch s psoiltops mix n surface urlac overd2till inchee diameter. - •= -.... \,..\ (15X MAX) n inches of soil. .v • Place second Ilk of 3 Inches topwl mix on carton. • Rake bpede t gsmooth.w and remove surface cmulch. \\% / / \\,\ \�\, IX GRADE oxAw T. • Mulch Ian tin beds with 2 inches of organic /v \/ Turf AroseUse• portion Imported a topsoil men sandy lea 5%organic matter(typically around 25%compost).Sell 1 portion must be wnd or sandy loam as defined by the USDA NATIVE MATERIAL m • Place 3 Inches of Imported topsoil mix an surface and toll late,2 Inches of and DRIVEWAY SECTION SOILS WITHIN THE DISPERSION AREA N r • Plaea second lift of 3 Inches topsoil mix an surface. SHALL MEET THE POST-CONSTRUCTION E ; 0• Water ar roll to compact sail to 85X of maximum. SOIL DUALITY AND DEPTH(BMP 75.13) o one • Rake to level,and remove surface rocks larger than 1 Inch diameter. REQUIREMENTS(l)NDISTURBED on< a NATIVE SOIL AND VEGETATION IS ry 3 rev i. i More than one meted may be used-different portsors of the some site.Son that already meets �-emrn�sn�� 2 'o the depth and organic matter quality standards,and Is not compacted,does not need to be amended. NO E& CpNAE AW,/• o See the Sods far Salmona(2009)websits for further discussion of Implementation and for pre-approved SLOPES WITHIN THE DISPERSION AREA SHALL BE UNIFORM/SMOOTH TO PROVIDE ac E 3 rates of soil amendment FOR UNIFORM DISPERSION OF STORMWATER RUNOFF AND M PREVENT >. 3 CHANNELING. 8 O m 3 Construction and Maintenance THE DISPERSION AREA SHALL CONSIST OF WELL-ESTABLISHED LAWN OR _ PASTURE.LANDSCAPING WITH WELL-ESTABLISHED GRWNDCOVER,OR NATIVE 4e the Soils for Salmon webslte and the guidance provided in the most current edition of"Guidelines and VEGETATION WITH NATURAL GROUNDCOVER.THE GRQUNDCOVER SHALL BE DENSE swrcea for Implementing Sod Quality and Depth BMP T5.13 in the WDOE Starmwatr Management Manual ENOUGH TO HELP DISPERSE AND INFILTRATE FLOWS AND TO PREVENT EROSION. Western for Western Washington; -(available at www.buildingaoil.arg)Is on Implementing the Poet-Con MAINTAIN POSITIVE DRAINAGE AWAY FROM ANY STRUCTURES PER BUILDING CODE struction REQUIREMENTS W, Y Sod Quality and Depth MP. Maintenance • Sol]quality and depth Mould be established near the end of construction and,once established. SHEET FLOW DISPERSION AREA (BMP T5.12) DETAIL .r o Protected from compaction(e.g.,by large machinery use)and from erosion. \.-.5. O.I L •• SoPldntehdouda b,plt-teduiad mulchd immediatey after instillation. a b arsvalent Mould be left an the end surface to replenish organic matter.• Reduce irrigation and the application of fertilizers,herbicides and pesticides. JOB NUMBER: 20058 DRAWING NAME: 20058nETL1 "CALL UNDERGROUND LOCATE AT 811 BEFORE YOU DIG" SHEET: 2 OF 2