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Home My WebLink About935100011 Stormwater Mgmt THORNDYKE ROAD STORMWATER SITE PLAN RAYMOND AND ARLINESTELK Report Prepared for: Raymond & Arline Stelk Osprey Ridge Road Port Ludlow, W A 98365 August 2, 2004 ~/l- /61' Report By: Tillman Engineering P.O. Box 1375 Port Hadlock, Washington 98339 (360) 379-9661 r .::;:--.-._-~-'----,---..---- I P ~~~J~ JljV1lifl ~ IU U[~~~_~ 2004 JtW JEFFERSON COIJt-lTY-- DEPT OF CO!.1MUNITY O-EVELOPMENT APPROVED STORMW A TER PLAN AUS 2 6 2004 3 II. PLOT PLAN - (See Attachment 'A', Site Plan) 3 III. CONDITIONS SUMMARY 3 Subsurface Soil Conditions and Stability ...,.,........................,.............................,.................................. 3 IV. OFF SITE ANALYSIS 4 V. ANALYSIS AND DESIGN OF STORMWATER FACILITIES 4 VI. SPECIAL REPORTS AND STUDIES 5 VII. BASIN AND COMMUNITY PLANNING AREAS 5 VIII. OTHER PERMITS 5 2.5.1 Minimum Requirement #1: Preparation of Storm water Site Plans 6 2.5.2 Minimum Requirement #2: Construction Storm water Pollution Prevention (SWPP) 6 2.5.3 Minimum Requirement #3: Source Control of Pollution 9 2.5.4 Minimum Requirement #4: Preservation of Natural Drainage Systems and Outfalls 9 2.5.5 Minimum Requirement #5: On-site Stormwater Management 9 ATTACHMENT I A IT ACHMENT II A IT ACHMENT III S.C.S. MAP OF THE PROJECT LOCATION SITE PLANS CALCULATIONS Ray Stelk Stormwater Site Plan (no address assigned) Thorndyke Road Port Ludlow, W A 98365 August 2, 2004 Page 2 I. PROJECT OVERVIEW The applicant is applyingfora residential building permit from Jefferson County for parcel 935100011, also known as Lot 12, Division 5, Plat of Bridgehaven, The stormwater plan is developed to address concerns regarding disposal of stormwater on this parcel and comply with provisions within the County Unified Development Code (UDC). Mr, Stelk purchased the property in the spring of2004 with the intent to develop a single family residence on the site. Mr. Stelk has commissioned topographic and boundary surveys to ascertain the property limits and limitations, a septic system design and two geological! geotechnical engineering reports, The site has been brushed enough to allow digging of soils test pits, but is otherwise undisturbed as of the date of this report, TIle site is proximate to recent historic slide activity, and the site is considered a Landslide Hazard zone. II. PLOT PLAN - (See Attachment 'A', Site Plan) III. CONDITIONS SUMMARY The subject property contains no site development at the time of this report, The westerly half of the subject property is easterly sloping at moderate grades of approximately 10-20 percent. The easterly half of the site slopes steeply to the east at approximately 50 to 60%. A small portion of the site is bare earth, including areas where recent soil test pits have been dug, Volunteer grasses, brush, mature and immature trees cover most of the site. The adjacent lots to the north and west across Thorndyke Road contain developed residences. The property immediately south of the site has been partially developed, and contains a driveway, fencing and an installed septic system but no residence. Surface Soil Conditions The native site soils are mapped in the Soil Survey of Jefferson County Area, Washington, August 1975, by the Soil Conservation Service (SCS), The dominant soil types mapped in the project vicinity is Alderwood gravelly loamy sand (AIC), Hoypus gravelly sandy loam (HuC), and Everett gravelly sandy loam (EvD), See the attached pages from the soil survey for specific soil profile descriptions, Based on discussions with project geologists and septic system designers, the soils are described as sandy loam to loamy sand with areas of glacial till hardpan. Robert Pride, P.E, recommended consideration of the underlying infiltration soils as tills, with attendant infiltration rate of 1 "/hour, Given the pervious nature of much of the soils, this assumption should yield a conservative approach, Subsurface Soil Conditions and Stabilitv The property owner has commissioned two separate geological reviews of his property, given the property's location within a County mapped Landslide Hazard zone, Previous earth movement occurred immediately south of the Stelk property. It is our understanding that this landslide movement occurred when surface soils on the steel slope became highly saturated following a storm event and a large landslide resulted, William Payton and Bob Leach, P.E, ofNTI in Port Angeles collaborated on an initial review. Subsequent review was done by geotechnical engineer Robert Pride, P,E, The Payton/Leach report did not make suggestions regarding stormwater disposal for this site. However, follow up conversations with them indicated that they recommended that stormwater be tightlined to the Ray Stelk.Stormwater Site Plan (no address assigned) Thorndyke Road Port Ludlow, W A 98365 August 2, 2004 Page 3 base of the steep slopeifpQssible. . Mr~ ~telkl1ad anoppomnuty to purchase an easement from the downhill property ownerbut indicated that costs Were too higb so as to Ifuike that oj>tionmoot. Mr. Pride indicated that stormwater could be infiltrated westerly of the homesite without detriment to site stability. He indicated that it was desirable to have the infiltration occur 100 feet upslope of the top of slope, as measured perpendicularly down the contours, Given the infiltration rate recommended by Pride, and the locations recommended by both NTI and Pride, the system has been designed westerly of the home, Storm Drainaee Storm drainage patterns on the Stelk site have historically been overland flow to the east and infiltrated flows in the sandy surface soils, Stormwater runoff from Thorndyke Road flows onto the Stelk site due to the lack of stormwater controls on the county road, There are no drainage channels on site, and no conveyances. IV. OFF SITE ANALYSIS As with most projects, there is the potential for off-site transport of eroded soils, Implementation of erosion controls and timing of earthmoving activities to coincide with the summer dry season will reduce the risk of sedimentation to the adjacent properties. There is contribution to site stormwater from adjacent properties to the south and from Thorndyke Road, due the easterly and northerly sloping landform. There are no conveyances onto or across the site as it currently exists, although as noted above, The principal off-site issue is stability of the slope easterly of the Stelk residence, especially as a result of stormwater infiltration and erosion control issues during construction. V. ANALYSIS AND DESIGN OF STORMWATER FACILITIES The impervious areas of the developed Stelk site will be collected at a catch basin in the driveway immediately upslope of his garage, Roof downspouts, and the hard surfacing of the driveway will be routed to this point. From the catch basin, the stormwater will be routed into an underground infiltration bed, where it will percolate back into the subsurface soils, A level spreader device has been incorporated as an emergency overflow to keep a point discharge away from the crest of the slope. Areas of the site will remain uncontrolled, including the slope itself and the area between the home and the top of slope, Stormwater quantities have been calculated using the King County HYD program, including infiltration trench subroutines, The calculations have been made for up to and including a 100 year recurrence event. This is a very conservative approach, but is likely warranted due to the history of instability in the area. Given the above calculations, a stormwater disposal bed IS-feet wide and 33-feet long is proposed. The current project will disturb approximately 9000 square feet of the site, and the total site impervious area will be limited to approximately 4440 square feet under Bulk and Dimensional standards contained within the UDC including residence, garage, parking areas and the access driveway. It is noted that the site impervious coverage is limited to 25% of the gross site area, or approximately 4440 square feet, under the requirements of the UDC. Some clearing and grading will take place within the Landslide Hazard Buffer. Ray Stelk Stormwater Site Plan (no address assigned) Thorndyke Road Port Ludlow, W A 98365 August 2, 2004 Page 4 VI. SPECIAL REPORTS AND STUDIES Report on Geotechnical Recommendations, July 19,2004, Robert M, Pride, Inc, Report on Geology, June 2004, NTI. VII. BASIN AND COMMUNITY PLANNING AREAS There is no known basin plan for this locale. VIII. OTHER PERMITS The enforcement action seeks compliance with a stormwater permit. A building permit, together with the associated septic system permit and electrical work permit will be required for the construction of the proposed residence and/or garage and shop, At the time of this plan, the proponent has submitted neither the septic system permit nor the residential construction permit. Ray Stelk Stormwater Site Plan (no address assigned) Thorndyke Road Port Ludlow, W A 98365 August 2, 2004 Page 5 2.5.1.MinimumJl.equirem.ent#1.:Preparanon()f.Stormwater. Site Plans All projects meeting the thresholds in Section 2.4 shall prepare a Stormwater Site Plan for local government review.Stormwater Site Plans shall be prepared in accordance with.Chapter 3 of this volume. This project proposes the current grading of approximately 50 to 100 cubic yards of material and approximately 9000 sf of land disturbing activity to clear and grade the site. The proponent also proposes construction of an approximate 3000 SF residence and approximately 1200 estimated SF of related parking area and driveways, Minimum requirements 1 through 5 of the current Stormwater Manual for Western Washington will apply for all new impervious surfaces. 2.5.2 Minimum Requirement #2: Construction Stormwater Pollution Prevention (SWPP) Element 1: Mark Clearing Limits The clearing limits will be established and delineated through use of silt fences which double as erosion control plan elements, Element 2: Establish Construction Access Construction access for the project site will be developed at the approach from Thorndyke Road. See also Erosion Control Plan, Sheet 4, of the project plans, Element 3: Control Flow Rates An interceptor trench is proposed to control stormwater runoff from Thorndyke Road currently entering the site, Flows generated from on-site surfaces will be infiltrated back to surface and subsurface soils, thereby controlling the rates. No offsite flows are anticipated during initial construction. The proposal seeks to infiltrate all stormwater run-off in on-site and infiltration trenches. Element 4: Install Sediment Controls The duff layer, native topsoil, and natural vegetation within the landslide hazard zone and buffer will be retained in an undisturbed state to the maximum extent practicable, A silt fence will be placed downslope of earth disturbing activity, as required, to prevent sediment from exiting to the roadside ditch, Other sediment control BMPs will be utilized, if required. Element 5: Stabilize Soils All exposed and unworked soils not targeted for construction of buildings shall be stabilized by application ofBMP C120, Temporary and Permanent Seeding, and BMP C121, Mulching, to protect the soil from the erosive forces of raindrop impact and flowing water, and wind erosion, It is felt that the most serious consequence would be from long term winter rains and not intermittent summer of fall storms given the history oflocal instability, Notes on the construction plan require stabilization with seeding after the fine grading of the site is done. Hyclroseeding will be required ifseed has not germinated and the site is re-vegetated by October 15, 2004. Ray Stelk Stormwater Site Plan (no address assigned) Thorndyke Road Port Ludlow, W A 98365 August 2, 2004 Page 6 From October 1 tproughApri130,~0 soils shallremainexposedandunworked for more than 2 days. From May 1 to SepteInber30, no soils shallremain exposed and unworked for mOre than 7 days, This condition applies to all soils on site, whether at final grade or not. These time limits may be adjusted by the local permitting authority if it can be shown that the average time between storm events justifies a different standard. Work on this construction site will not exceed the capability of the contractor to to re-stabilize the disturbed soils, meeting the timing conditions listed above. Eleme1lt 6: Protect Slopes The project contractor shall avoid work within the Landslide Hazard zone and the buffer to the extent practical. The steep slope is to remain undisturbed in it's entirety, Eleme1lt 7: Protect Drain Inlets A temporary silt fence shall be installed around the catch basin within the driveway to prevent silt from entering the stormwater infiltration bed, Eleme1lt 8: Stabilize Channels and Outlets The permanent surface stabilization consists of one french drain, an interceptor swale with infiltration and general site stabilization, Eleme1lt 9: Control Pollutants All pollutants, including waste materials and demolition debris, that occur on-site during construction, will be handled and disposed of in a manner that does not cause contamination of stormwater. Cover, containment, and protection from vandalism will be provided for all chemicals, liquid products, petroleum products, and non-inert wastes present on the site (see Chapter 173-304 WAC for the definition of inert waste). Maintenance and repair of heavy equipment and vehicles involving oil changes, hydraulic system drain down, solvent and de-greasing cleaning operations, fuel tank drain down and removal, and other activities which may result in discharge or spillage of pollutants to the ground or into stormwater runoff will be conducted using spill prevention measures, such as drip pans. Contaminated surfaces will be cleaned immediately following any discharge or spill incident. Emergency repairs may be performed on-site using temporary plastic placed beneath and, if raining, over the vehicle, Wheel wash, or tire bath wastewater, will be discharged to a separate on-site treatment system or to a sanitary sewer. A wheel wash is not anticipated but may be used if mud tracking becomes an issue. Application of agricultural chemicals, including fertilizers and pesticides, will be conducted in a manner and at application rates that will not result in loss of chemical to stormwater runoff. Manufacturers' recommendations will be followed for application rates and procedures, Management of pH-modifying sources will prevent contamination of runoff and stormwater collected on the site. These sources include, but are not limited to, bulk cement, cement kiln dust, fly ash, new concrete washing and curing waters, waste streams generated from concrete grinding and sawing, exposed aggregate processes, and concrete pumping and mixer washout waters, Ray Stelk Stormwater Site Plan (no address assigned) Thorndyke Road Port Ludlow, W A 98365 August 2, 2004 Page 7 Eleml!nt 10: Control De-Watering Highly turbid or otherwise contaminated dewatering water, such as from construction equipment operation, clamshell digging, concrete tremie pour, or work inside a cofferdam, will be handled separately from stormwater at the site. Other disposal options, may include: 1) infiltration, 2) transport off-site in vehicle, such as a vacuum flush truck, for legal disposal in a manner that does not pollute state waters, 3) on-site treatment using chemical treatment or other suitable treatment technologies, Dewatering is not anticipated for this project. Element 11: Maintain BMPs All temporary and permanent erosion and sediment control BMPs will be maintained and repaired as needed to assure continued performance of their intended function. All maintenance and repair will be conducted in accordance with BMPs, Sediment control BMPs will be inspected weekly or after a runoff-producing storm event during the dry season and daily during the wet season, All temporary erosion and sediment control BMPs will be removed within 30 days after final site stabilization is achieved or after the temporary BMPs are no longer needed. Trapped sediment will be removed or stabilized on site, Disturbed soil areas resulting from removal of BMPs or vegetation will be permanently stabilized, Element 12: Manage The Project As stated in Element 5, work on this construction site will not exceed the capability of the contractor to re- stabilize the disturbed soils, meeting the appropriate timing conditions, The following activities are exempt from the seasonal clearing and grading limitations: 1. Routine maintenance and necessary repair of erosion and sediment control BMPs; 2. Routine maintenance of public facilities or existing utility structures that do not expose the soil or result in the removal of the vegetative cover to soil; and Activities where there is one hundred percent infiltration of surface water runoff within the site in approved and installed erosion and sediment control facilities, Inspection and Monitoring - All BMPs shall be inspected, maintained, and repaired as needed to assure continued performance of their intended function, Whenever inspection and/or monitoring reveals that the BMPs identified in the Construction SWPPP are inadequate, due to the actual discharge of or potential to discharge a significant amount of any pollutant, the SWPPP shall be modified, as appropriate, in a timely manner. Maintenance of the Construction SWPPP - The Construction SWPPP shall be retained on-site or within reasonable access to the site, The Construction SWPPP shall be modified whenever there is a significant change in the design, construction, operation, or maintenance of any BMP. Ray Stelk Stormwater Site Plan (no address assigned) Thorndyke Road Port Ludlow, W A 98365 August 2, 2004 Page 8 2.5.3 Minimum Requirement #3: Source Control of Pollution All known, available and reasonable source control BMPs shall be applied to all projects. Source control BMPs shall be selected, designed, and maintained according to this manual. The contractor will utilize appropriate BMP's should the need arise for preventing stormwater from coming into contact with pollutants. 2.5.4 Minimum Requirement #4: Preservation of Natural Drainage Systems and Outfalls Natural drainage patterns shall be maintained, and discharges from the project site shall occur at the natural location, to the maximum extent practicable. The manner by which mnoffisdischarged from the project site must not cause a significant adverse impact to downstream receiving waters and down gradient properties. All outfalls require energy dissipation. The stormwater plan has been devised to infiltrate the maximum extent possible, which mimics the natural conditions, There is an overflow to the infiltration system, consisting of a level spreader. The level spreader will disburse flow across the slope to avoid concentration of stormwater at point discharges. 2.5.5 Minimum Requirement #5: On-site Stormwater Management Projects shall employ On-site Stormwater Management BMPs to infiltrate, disperse, and retain stormwaterrunoff onsite to the maximum extent feasible without causing flooding or erosion impacts. Roof Downspout Control BMPs, functionally equivalent to those described in Chapter 3 of Volume III, and Dispersion and Soil Quality BMPs, functionally equivalent to those in Chapter 5 of Volume V, shall be required to reduce the hydrologic disruption of developed sites. Stormwater runoff from the site will be infiltrated back into the native soils prior to leaving the site. Ray Stelk Stormwater Site Plan (no address assigned) Thorndyke Road Port Ludlow, W A 98365 August 2, 2004 Page 9 HASHINGTOr- SHEE: '"U'viSER ~,.,~c., "c,.-.-, :~:j-;. ,. ," ~o-' ,,"_' 8 ~~;Sl1BVEY 60 inches. The soil holds 10 or.moreill,che8'of;watet~~e fornhmts" Runoff is, slow, an<l,the~~:~~eI()S,i9fl is'~ight.A..s(!asonal.v;ater~fa;plg;i~jj.~]l4~ptlt:p(lj;ft:~~;t~, -"- AbO\lt-- 6b to -70 percent~ ot~tlle.,.-~a.creage--fs'~used.--f6r~.crops" -- Pasture. hay, and silage from mixed grasses and legumes are the,pri:ricip~l crops. .-\. variety of gar~~n v~tables, berries, and tree fmits may be grown. CapabilIty wut IIIw-l; wood- land group 3d2, Agnew silt loam, 30 to 50 percent slopes \AgE).- This soil is mainlv along ocean' bluffs or canyon Sidewalls, The subsoil in many places contains strata of silty clay loam, fine sandy loam, silty clay, and sandy clay lo~. Runoff is rapid. and the hazard of water erOSIOn IS s~v~re, :\Iost areas of this soil are wooded. '''nen used for buIlding sites, the soil often slides when saturated, Capability unit VIe-I: woodland group 3d2. Ahl Series The Ahl series consists of well-drained, very gravelly loam soils underlain by basalt bedrock at a depth of 24 to 40 inches. These soils are on mountainous terrain. Slopes range from 50 to 90 percent, Elevation ranges from 800 to about 3,000 feet. These soils formed in weathered basalt under a dominantly coniferous forest of Douglas-fir, western hemlock, and western redcedar, Annual precipitation is 60 to 80 inches, The average annual air temperature is about 490F, The above :320F grolying season ranges from 150 to 190 days, and the above :280F oTOIling season ranges from 180 to 230 days. These soils are "associated mainly v.ith Grove, Lystair, Olete, and Triton soils, In a representative profile a thin layer of organic litter covers the surface. The upper 3 inches of the soil is dark reddish-brown very gravelly loam. Below this, to a depth of 30 inches, is very gravelly loam that is dark red in the, upper part and reddish bro,yn in the lower part, Beneath this, and e,,-tending to a depth of 38 inches, is mostly angular basa~t uebbles and iractured. weathered basalt, Basalt bedrock IS at a depth oi 38 inch~. Ahl soils are used mainly for tree production and for "\\ild- life habitat and recreation areas, Ahl very gravelly loam, 50 to 70 percent slopes (AhF),-This very steep soil is in the mountains. Representative profile in SE~NW~SE~ sec. 34, T, 27 N" R. 2 W" 1.2 miles south of U.S. Highway 101 along :\1 t, Walker Road, 15 feet east of road, 01-3 inches to 1 inch, needles, leaves, twigs, bark, moss, and frag- ments of wood. 02-1 inch to 0, decomposing organic litter, B21ir-D to 3 inches, dark reddish-brown (5YR 3/4) very gravelly loam, reddish brown (2,5YR 5/4) dry; weak, fine and very fine, granular structure; soft, veri friable, slightly sticky, plastic, smeary; many fine, medium, and large roots; 55 per- cent angular basalt pebbles; medium acid; clear, wavy bound- ary. (2 to 6 inches thick) B22ir-;1 to 20inehes, dark-red'(2.5YR 3/6) very gra.velly loa.m, reddishbroWQ;(2.5YR5/4)qry;weak,: fine, granular and sub- angular blockY structure; Soft, very friable, slightly sticky, plastic,smeary;many fine,medium, and la.rgerOOts; 55 per- cent angula.r basalt pebbles and 5 percent rounded pebbles; mediuma.cidjgradual,wavy boundary. (10 to 18 inches thick) B3-20 to 30 inches, reddish-brown (5YR 4/4) very gravelly loam, ligb.t:~dishbrown (5YR6f4) dry; massive; ~ft,. ~e, .~~'.-lailtit:'~i:,coJXunon)ine'.r~." ... '.~ ;;~c~,6~.,.;r~e;TsJiill~ici4; .,. iUlual, "it'" ';;;~lQ1.~.jnchesthil:k) 'e'. ".: '~""':'''''''':~'''' .... "y' .' H~~~wc~:_~~~tv:t~ ~~~=~ain,'liiht reddish brown (5YR 6/4) dry; massive; slightly acid; gradual,>~ .; R3fu~h:~=t~~~~inches thick) .. .... . '.' ................ ,';iJePthi.btlaSiuf~~tikkra"ngtiSktim24'to 40 luc-hes,'"TheBir " horizons are very gravelly loam or very ~rnvelly silt loam, The C horizon is more than 80 percent fractured basalt bedrock, Included with this soil in mapping are small areas of Rock outcrop and of Triton soils, This soil is well drained. Permeability is moderate. Roots penetrate to the bedrock. This soil holds 2 to 4 inches .of water available for plants, Runoff is very rapid, and the hazard of erosion is very severe, This soil is used mainly for tree production and for 'wildlife habitat and recreation areas. Capability unit vl:Ie-l: wood- land group 3d2, AhI-Rock outcrop complex, 50 to 90 percent slopes (AkF),- This mapping unit is made up of about ,')0 to 70 oercent .ill very gravelly loam. It is 30 to 50 percent Rock outcrop and stony areas, The .ill soil is 24 to 30 inches deep in most places, Almost all the acreage of the complex is used for tree production and for 'wildlife habitat and recreation areas. Capability unit VIIs-I; woodland group 4x2, Alderwood Series The Alderwood series consists of moderately well drained soils that have a very slowly permeable cemented layer at a depth of 20 to 40 inches, Slopes range from 0 to 50 percent, Elevation ranges from 100 to 800 feet. These soils formed in glacial till under a forest of mixed coniferous and broad- leaved vegetation. Annual precipitation ranges from 25 to 50 inches. The average annual air temperature is about 490F, The above 320F growing season ranges from 160 to 260 days, and the above 280F growing season ranges from 220 to 320 davs. These soils are associated mainly -with Beausite, Casey, Clallam, Dick, Everett, Hoypus, Indianola, Sinclair, and Whidbev soils. In a representative profile a thin layer of organic litter covers the surface. The top 1 inch of the soil is very dark grayish-brown gravelly fine sandy loam, Below this, to a depth of 12 inches, is dark yello"\\-ish-brown gravelly sandy loam. Beneath this layer, and continuing to a depth of 30 inches, is gravelly sandy loam that is brown in the upPE,lr part and dark grayish brown and prominently mottled-fu the lower part, The next layer is a dark grayish-brown cemented layer that formed in very compact glacial till. Rounded pebbles, cobblestones, and stones are on the surface and throughout the profile. Alderwood soils are used mainly for tree production and for wildlife habitat and recreation areas. Less than 30 percent of the acreage is used for grov.ing pasture plants, hay plants, and diversified farm crops, Alderwood gravelly sandy loam, 0 to 15 percent slopes (AIC).-This nearly level to rolling soil is on glacial terraces. In most places the slope is 5 to 10 percent. Representative profile 100 yards west of house, southwest side of Beausite Lake; SE~NE~SE~ sec. 28, T. 29 N., R.1 W.: 01-1~ inches to % inch, needles, leaves, bark, and fragments of wood. '~~O.N COUNTY: .ABEA.~V{ASHIN'GTO.N 9 "-:--.C granl}lar structure; soft, veryr friable, nolisticky and non- loam, 15 to 30 percent slopes, as well as small areas of Plas~c; m~ny fine., and" mediwn.J:Ol)tB;,.25;~~ct.w>b.les;',.,. ,'EVerett,~-I~lr!i~ola:.:HoyptlS' Sinclair,,' and' Whidbey~soi1s,c" .'....m~~~~; cl,~Jsp1~~ 1.,;t;~?~~lSit~FsI~.es;';-YLc. .~. ;-}~< /,:.' > , "",<.".;.c..~' >~"..~ 16 ,. ., ., _ ~3::{1J;j:@il.ilS.mpld, and "the hazard of water erOSlOn -msevere: ',." . ,.. . "L". " f'-- " " Y-....TBiSsou:wusedfor tree production and for wildlife habitat plastic;maJiy e.anainedium roots; common ~ ~n- and recreation areas. Capability unit VIe-l; woodland group IWi.nganese concretions; 40 percent gravel; medium aCId; 3d2 gradual, w&'!7 boundary. (4 to 6 inches thick) . II 1- I B22iren-6t~I2mches darkvellowish-brown (10YR4/4) gravelly Alderwood grave y loam, 0 to a percent s opes sandy loam, pale bi-own (lOYR 6/3) dry; wesJc. fine, subangu- (Ame).- This nearly level to rolling soil is on glacial terraces, ~ blocky st~cture; slightly hard, f~ablei slightly sticky and The surface layer and subsoil are gravelly loam. :lightly plastic; many f;ine and medium roots; co~on ~ Included with this soil in mapping are small tracts having Iron-manganese concretIOns; 40 percent pebbles; shghtly aCid; d h f ') ~'h clear, wavy boundary, (5 to 7 inches thick) shale or sal}-?sto!le at a ept o. _0 ~o 06 mc es,. ^ B3-12 to 21 inches, brown (lOYR 4/3) gravelly sandy loam, pale Permeability IS moderate, This soil holds 3 to 6 mches ot brown (lOYR 6/3) dIJ:; weak,.fine, sub.angular, blocky str~c- water available for plants, ture; slIghtly hard! fnable, shg;htly stIcky, sligh~l'y plast.lc; This soil is used mainly for tree production and for wildlife many fine and medIUm roots; 40 percent gravel; shghtly aCId;. . > . '. " 7 . . d clear, smooth boundary, (6 to 12 inches thick) habItat and recreatIOn areas. Capablht} UIllt n e-l, \\ 00 _ Cl-21 to 30 inches, dark grayish-brown (10Yll 4/2) gravelly land group 3d2. sandy loam, ~ight gra:[ (lOYR 7/2) dIJ"; many ~edium, promi- Alderwood gravelly loam, 15 to 30 percent slopes n~t, yell~WlSh-re?- (DYR 4/~) mottles;masslve; ~ard, firm, (AmD) -This moderately steep soil is in areas where the slightly stICky, shghtly plastIC; few fine and medium roots; .', .' h h 45 percent gravel' medium acid' gradual wavy boundal.... rolling, upland glaCIal terraces converge "It t e steep (4. to 16 inchesthi~k) " - drainagewayravines. The surface layer and subsoil are C2sim-30toA8inches, dark grayish~brown (10YR 4/~ weakly gravelly loam, cemented gravelly ~andy loam, ~Ight gra:r (lOYR 1/2) dry; This soil holds 3 to 6 inches of water available for plants, many coarse, promment, yellOWISh-red (0 YR 4/6) mottles;, . , ' . d' 'd d massive' extremely hard extremeh' firm: no roots' slightly Permeability IS moderate, Runoff IS me mm to rap I , an acid. (10 to 18 inches thi~k) ., , - the hazard of erosion is moderate to severe, C3-!8inc~!!;'l, very compact gravelly sandy loam glacial till, C\fany This soil is used mainly for tree production and for \\'ildlife feet thICk) habitat and recreation areas, Capability unit VIe-I; woodland The depth to the cemented layer rang~ from 20 to 40 inche~. group 3d2, The .-\.2 and B2ircn horizons range from very dark grayish brown Alderwood-Quilcene complex. 0 to 15 percent slopes to dark vellov,rish brown, Their content of coarse fra",<rments ranges (AuC).-This mapping unit is made up of about 60 percent .:"~.from20 h 50 percent and averages more than 35 percent, In places d "C' the upper part of the Cl horizon is compact gravelly loamy sand. Alderwood gravelly sandy loam, 0 to 15 percent slopes, an .. Few to many hard iron-manganese concretions are in the A2, about 30 percent Quilcene silt loam, 0 to 15 percent slopes, - .B2ircn, and B22ircn horizons. The mostly rolling Alderwood soil is on glacial moraines. The nearly level to strongly sloping Quilcene soil is mostl~. in areas adjacent to the moraines. About 10 percent or the acreage is Everett, Ho~'pu"" and Indianola soil:". ?\Iost of tlus acreage is wooded. .-\. small acreage has been cleared and planted to pasture. Capability unit lYe-I; woodland group 3d2, i:"Small areas of sandy, very graYell~'. 'x cobbly soils are i1icluded with this soil in mapping. .:.!f'bis soil is moderatehT ,,'ell drained. Permeabilit\. abo\'{, the cemented layer is moderately rapid. Hoots penetrate to tJie"eemented layer and flatten out on top of it. A perched ~r table is above the cemented la}'er during the winter ~ths. This soil holds 2 to 4 inches of water available for Plfi,ts. Runoff is slm,' to medium, and the hazard of water ~n is slight to moderate, "~'soilis used for permanent pasture of mixed grasses l~mes, Both hay and silage are commonly produced, ":-grains, vegetables, berries, and fruit trees are also . . Capability unit IVe-l; woodland group 3d2. l~J.lerwood gravelly sandy loam, 15 to 30 percent sIiJpes (AID).-This moderatel~' st.eep soil is in places where tJiltrolling glacial upland terrace!' comTerge toward ravines an,dst.eep drainageways. ?BUnoff is medium to rapid, and the hazard of water e.rosion is moderate tD severe. This soil is used mainly for ~pfoduction and for wildlife habitat and recreation areas, .. suited tD permanent hay and pasture crops, Capa- 'tVle-l; woodland group 3d2. ood gravelly sandy loam, 30 to 50 percent . (AIE).-This steep soil is on glaciated uplands, Iy in small areas along steep morainal margins or . '. n sidewalls, On the upper third of the slopes, the su,lface layer and subsoil arc often 20 to 24 inches thick "cementoo layer; Along the bottom slopes, depth to nted layer is 30 to 40 inches, with this Boil in mapping. arc$rnall areas of ~Wd;i~gravelly sandy loam andAlderwOOd gravelly Beausite Series The Beausite series consists of well-drained soils underlain by strongly cemented sandstone conglomerate at a depth of 20 to 36 inches, Thev are on the sides of vallevs, mostly south and southeast of Discoven' Bay in the northeastern part of Jefferson County, Slopes ;ange' from 0 to 50 percent. Elevation ranges from 50 tD 1,500 feet. These soils formed under a dominantly coniferous iorest in \\"cathered con- glomerate consisting of mixed acid and basic rocks, Annual precipitation ranges from 30 to 40 inches, The average annual air temperaturc is about 50oF. The above 320F growing season ranges from about 220 to 250 days, and the above 280F growing season ranges from about 270 to 300 days, These soils are associated mainly with Alderwood, Everett, Iridianola, QuHcene, and Sinclair soils. In a. representative profile a thin layer of organic litter covers the sUrface, The upper 22 inches of the soil is gravelly sandy loam that is dark brown in the upper part and dark yellO"wish brown in the lower part. BdO\\. this, to a depth of 33 inches,.is brown and grayish-brown very gravelly sandy loam. Benea.th.this layer is strongl~' ccmentc'<.l, very gravelly sandstone,'~nglornerate. "~~. "]~.a~e used mainly for tree production and for wiliJlilEr~taridrooreation areas. 18 SOIL SURVEY ~ ; blocky structure; soft, very friable, nonsticky, nonplastic; ~JlU!l{)n fineandllledium1"9Qts; neutral;clear,WfI.\'Y boundary, - 8 incheS thiCk) ...... .. .' ~. ....... . . ...~Jiglit.OJivj).oroWn(2;5Y'$I4:},i~~di:light., '7-<<riy.(21iY 6/2ldry; few,. fine;'pronunenf'browJl .5YR 4/4) mottles; single grained; loose, nonstick-y, non- plastic; few line and medium roots: neutral; gradual, wavy boundary. (12 to 16 inches thick) C'2-24 to 37 inches, olive-brown (2.5Y 4/4) loamy sand, light brownish gray (2.5Y 6/2) dry; single grained; loose, nonstick..y, nonplastic; few fine and medium roots; neutral; clear, wav}' boundary, (12 to 16 inches thick) C3-37 to 60 inches. light olive-brown (2,5Y 5/4) loamy sand, very pale brown (IOYR 7/3) dry: single grained: loose, nonstick\', nonplastic: few fine and mediunl roots: common coa1'5e, diio- tinct, dark yellowish-brown (lOYH 4:4), discontinuous iron bands: neutra1. Reaction of the A anci B horizons ranges from neutral t{) medium acid. The A2 horizoE is grayish-brown or light browniioh-gre.y loamy sand or sand~' lO:iIll, The Band C horizons are loamy sand or fine sand, Yen' thin, finer textured iron bands are betvieen depths of 40 and 60 inches, This soil is somewhat excessivelv drained, Permeability is rapid. Roots penetrate to a depth of more than GO inches. This soil holds about 4 to 6 inches of water available for plants, Runoff is slow. and th~ hazard of water erosion is slight. . This soil is used mainly for production of trees and for recreation areas and wildlife habitat. Small acreages under cultivation are used lor gro\\ing permanent pasture, hay, berries, and vegetab;~;; Canabilit~. unit VIs-1: ,\'oodbnd group 4s2, i I :1 Dimal Series TheDimal series C011SisTS of sCJmei'lhat excessively drained, veryAlaggy soils underiain by bedrock at a depth of 10 to 20 inMes. These soils fom1ed in some of the harder meta- m.6rphosed sandstones and shale bedrock materials of the western Olympic :\Ioumain foothill areas. Dimal soil" are on rough,. broken mountain slopes and narrow, exposed ridge cres.tB~Slopes range from 50 to 00 percent. Elevation ranges frorrr'abbut> 1.000 to 3AOO feet. Native forest trees consist mostly of western hemlock, western redcedar, and Sitka spruce below elevation." of 1.500 feet and Pacific silver fir, western hemlock, mountain hemlock. and alpine fir at the higl:iercelevations, Annual precipitation ranges from 140 to 18(t.inches. The average annual air temperature is about 46"F:The above 32cF gro\\ing season ranges from 170 to 200 days, and the abc'F 2SoF groiiing season ranges from 180 to 220 days. Th,",~;, ;::r,11S are associated with ItsW001. 8nahopish, and BolIck> s"i1, In a representatiyr" :1rc!riir. in a wooded area. about ::; inches of litter and deeCJmprJsing materials cover the surface. The upper 3 inches of the soil is dark-brown, very fiagg:-' silt~. clay loam, Below thi.~. to a depth of 16 inches, the soil is dark..brown, very flaggy silty clay loam that is about 75 Percent coarse sandstone fragments, Bedrock is below a depth of 16inches. . The Dimal soils are among the principal ones of the higher, steeper, mountain ow, areas in the western part of the county. They are used for production of trees, wildlife liabitat, and recreation areas. .Qimalver~' flagg~' silty clay loam. 50 to 90 percent .,(DMF),-:-,"This steep t.o very steep soil is on rough, c....... ;,mountamous slopes and narrow ridge crests, In most · . . ,slopes range from 70. to 80 percent, but on ridge ethey are mostly 50 to 60 percent. Representative profile 1.4 miles up the Maple Creek Road and Abovetheroau, r'\'1VUSW)iSWUsec. 12, T.26 ~" :R.:ll,~:.LL,:.,,~=-_: 3'..F,::/.,,:0 "..:'.>c~>; :,';C;'"~.,, ,',:;., ... ;.,,=_'.:.'- .012' irtches t6~iTIl~h,'cn'eedfes;blri-~fregmeilts;)f wood,-and moss. 02-1 inch to 0, dark reddish-brown (5YR 2/2), partly decomposed needles, bark, fragments of wood, and moss; very strongly acid; abrupt, smooth boundary, (1 t.o 2 inches t.hick) AI--{) to 3 inches, dark-brown (lOYR 3/3) very fla.ggy silty clay loam, brown (10YR 5/3) dry; moderate, fine and mediunl, granular structure; slightly hard, friable, slightly sticky, slightly plastic; many fine, medium and coarse roots; 45 percent sandst.one fragments; strongly acid; gradual, wavy boundary, (I to 5 inches thick) B2-3 to 16 inches, dark-brown (7.5YR 4/4) ver~' flaggy silty cla~' loam, light yellowish brown (lOYR 6/4) dl!': moderate. me- dium, angular blocky nrucn:re; slightly hard, friable. slightly sticky, slighth' plastic: eommon fine, medium, and coarse roots; 75 percent sandstone fragments: medium acid: clear. wavy boundaf'l', (9 to 15 inches thick) R-16 to 60 inchei, dark-brown (i,5YR 4:4) shale and sandstone bedrock. Depth to bedrock ranges from 10 to 20 inches, The A horizon is very dark grayish-brown or dark-brown flaggy or vel!' flaggy silty clay loam. The B2 horizon is 50 to 80 percent coarse fragments. The soil material in this horizon is dark-brown, brown, and dark yellowish-brown vel!' Baggy silty clay loam and clay loam. The A horizon ranges from very strongly acid to strongly acid, and ,he B horizon ranges from strongl~' acid to medium acid. As much as 20 percent of some areas consists of inclusions of Solleks or Snahopish soils. Small areas of foek e>utcrop are also included. This soil is somewhat excessiveh- drained. Permeabili;:,' i~ moderate, Roots penetrate to beckock, This soil holds 1 to :2 inches of water available for plants, Runoff is very rapid, and the hazard of water erosion is Yen' severe. This soil is used for production or'trees and for \,-ucilift' habitat and recreation areas. Capability unit YIIs-l: v;ood- land group 4d1. Everett Series The Everett serie:" consists of somewhat excessiw]~' drained, gravelly soils. The~' formed in glacial out,,'ash UI: terraces with steep escarpments, Slopes range from 0 tc' 50 percent. Elevation ranges from slightly above sea level tC' about 500 feet. Native vegetation consists mainly of Douglas- fir, western hemlock, western redcedar, rhododendron, ma- drone, salal, huckleberry, Oregon grape, and bracken. Annual precipitation ranges from 26 to 35 inches, The ",wrage annual air temperature is about 50cF. The above 32cr growing season ranges from about 200 days, and the abc-,,! 280F growing season ranges froIL about 280 to 300 an,',. These soils are associated mainly with Alderwood. CarlsbCJrc:. Cassolary, Hoypus, Indianola. I\:itsap, and Sinclair soils, - In a representative profile :.2 to 3 inches of forest litter :iil':': decomposing organic matt.er cover the surface, The uppe: 6 inches ofthe soil is dark-brown gravelly sandy loam, Below this, to a depth of 16 inches, is dark-brown gravelly sandy loam. Next, to a depth of 26 inches, is light olive-brown gravelly loamy sand. Beneath this, and extending to a deptL of 48 inches, is dark grayish-brovv"Il very gravelly mediun: and coarse sand, Below this, to a depth of GO inche." i~ grayish...brown fine and medium sand. Everett soils are used mainly for production of trees. .Evefett gravelly sandy loam~ 0 to 15 percent slope.~ (Eye).--:This nearly level to rolling soil is on gle.cial outwasl] ~iln most places slopes range from 4 to 10 percent, F 20 plants. Runoff is slow, and the hazard of water erosion slight cto moderate." ThiS.:~il.is use<iIrtainlyfoi,pfoduction. of trees. \I'~il J; habitat, and recreation areas, Approximately 20 pem'l:' the acrca~c of this soil has been cleared and is U51", !l:rowing permanent lfig. 2) pasture, hay, and divfr< ~arden crops. Capability unit VIe-I; woodland group ;)i~ Everett gravelly sandy loam, 15 to 30 percent slop" EvD).- This hilly soil is on glacial outwash moraine terr:;.,' where they converge with the steep ravines and drainagc\\':c' Runoff is slow to medium. and the hazard of water f'rr:s:' is slight to moderate, This soil is used mainly for produe: "i' trees and for "ildlife habitat and recreation area5. C bility unit VIe-I; woodland group 3f2, Everett gravelly sandy loam, 30 to 50 percent "lon~'- E'/E':.-This steen :"oil::- on the sides of ravine:" :lI1d .,,',. TUYS below the hilly glacial terraces. RunotI is medium. and the hazard of water ,'rf)'",);. ;n0derate, This soil is used mainly for production 'J;" ~:.. and for "ildlife habitat and recreation areas. CaDabi:i~. unit VIe-I; woodland group 3f2. . Grove Series The Grove series consists of somewhat excessively drall""., and well-drained2 very gravelly soils, These soils formed ::. ~lacial outwash on terraces and plains. Slopes range i~(::. o to 50 percent, Elevation ranges from slightly abovc-:<, level to about 500 feet. ::\ ative vegetation consists mostl::: Douglas-fir, western hemlock, white pine, some western red- cedar, and an understory mostly of salal, bracken, evergre<:,n huckleberry, and rhododendron, Annual precipitation from 60 to 120 inches, The average annual air temperature> is about 50oF, The above 320Fgrowingseason ranges from about 160 to 200 days, and the above 280F growing sease.r:. ranges from about 210 to 250 days. These soils are associatcc[ mainly with Ahl, Hoodsport, Lystair, and Olete soils. In a representative profile (fig. 3) about 272 inches needles, twigs, leaves, and partly decomposed organic matter cover the surface, The upper 12 inches of the soil is uarl;: reddish-brmV1l very gravelly loamy sand. Below this, to 8. depth of 27 inches, is reddish-brmvn very gravelly coar::e sand. Beneath this, and extending to a depth of 40 inches, is dark-brmvn very gravelly sand. Below this, to a depth or 60 inches, is very dark grayish-brown gravelly coarse sand. Glacial cobbles are on the surface and throughout the profile in places, :\Iost of the Grove soils are wooded, Besides their use i.:~ production or trees, another important use is for summc' homesites, Grove very gravell~' loamy sand, 0 to 15 percen t slopes (GoC).- This soil is on glacial terraces and outwa"i', plains. In most places slopes range from 4 to 10 percent. Representative profile 0,5 mile west of Jackson Cove and 0.1 mile west of powerline in SE~NEUNWU see, 13, T. 26 ~.,R. 2 W,: 01-231 inches to 1 inch, needles, twigs, and leaves. 02-1 inch to 0, black (5YR 2f1), partly decomposed org~ni': matter from needles, twigs, and leaves; strongly acid; abl"l:)-. smooth boundary, ."e-very gray ;;:jC~~Qutside ,,;' ;. fiheseriesm . . .. COOSOlfdiited slIb- stia um,;~a depth of 30 to 40 inches. Tbi.(differel1.<:etloesDot alter th"i usefulliess;. and it affects their behavior only to' e. minor extent. ~~", . -;..., .~~(- :.....j~d. -; :'weHy ..' fine, .;;;-L;:;tIC; ,.dium :':f~Hy :';::aed; :.~: .).) ,~H.lary. .zr:nelh'loUlllV .and. t) to 15 .~ ....ltJt~ i..ef~r to dt"tJth ::1 (t~et. JEFFERSON COUNTY ~ WASHINGTON 25 .j~~Qout 5OoF. The above 320F growiI1g.onranges~.,:'jjAn.oft'iscmedium,and the hazard of water erosion is '.ut 150 to 200 days, and the above28~' growing' nlOder8.te. This soil is used mainly for producing trees and ,', . ,,<from about 200 to 240 days..These_soils~recforwild!i%~~b~tat and recreation areas. Capability unit &~~nl~~H~~~_~~~f~e.,'L.~:...q!:~JJi?~,H~; -- - ,.- ,~y~~~jl:io: l~ .percent. slo~ ^ ,C-tepf'{'sentatlve profile about 3 mches of needles, snearly level to rolling soil IS In small, Isolated bark,Rnd humus cover the surface. The upper 17 areas 'on glacial terrace ridgetops. Elevation ranges from "of the soil is reddish-brown very gravelly sandy loam, 300 to 500 feet. The upper 12 inches or more is dark reddish- ,his, to a depth of 28 inches, is dark yellowish-brown brown gravelly loam, Reaction is slightly acid to medium y sandy loam. Beneath this is a very dark gray ce- acid. Permeability is moderate above the cement.oo layer. layer. Glacial cobbles and stones are present on This soil holds about 3 to 5 inches of water available for face and throughout the soil. plants, lfetfrly all of the Hoodsport soils arc \\-aoded, Besides This soil is used mainly for production of trees for rOOuction of trees. another important use is for rural wood- wildlife habitat and recreation areas, Capability unit IVe-1: ,nd~homesitf'~. woodland group 3d2, . If9Odsport very gravelly sandy loam, 0 to 15 percent Hoodsport-Grove very gravelly sandy loams, 0 to 30 i~ (HoC).-This nearly level to rolling soil is on glacial percent slopes (H.rD),-This mapping unit consists of ,~, In most places slopes range from 6 to 12 percent. about equal proportIOns of Hoodsport ver~' gravelly sandy ~resentative profile 60 ff'ct west of D,S, Highway 101 loam, 0 to 15 percent slopes, and Grove very gravplly loamy :l~yards south and 120 yards west of SE74SWU corner sand, 15 to 30 percent slopes, The Hoodsport soil is mostly 'c~.t29;T. 25 :S., R. 2 'V.: undulating to gently rolling, and the Grove soil is mostly ~.C - hilly. ,Ol-2~ inches to 1 inch, needles, leaves, wood, and bark. This I d I f d f t d 02-1 inch t<l 0, black (5YR 2/1) partly decomposed needles, ' comp ex is use main y or pro uction 0 rees an leaves, wood, and bark; strongly acid; abrupt, smooth bound- for wildlife habitat and recreation areas. Capability unit my. (~t{)2 inches thick) VIe-I; \\'oodland group 3d2. B21ir--{) to 6 inches, reddish-brown (5YR 4/4) very gravelly sandy loam, reddish brovm (5YR 5/4) dry; weak, medium and coarse, granular structure; soft, very friable, nonsticky, Hoypus Series nonplastic: many roots: 60 percent gravel; strongl~' acid: gradual, wavy boundary. (4 to S inches thick; B22ir-6 to 17 inches, reddish-brown (5YR 4/4' yery gravelly sandy loam; reddish brown (5YR 5/4) dry; weak, fine and mediGIll, subangular blocky structure; soft, very friable, non- stick:;.., nonplastic; man~' roots: 60 percent gravel: strongly acid: lITadual, wavy boundan'. 00 to 16 inches thick! 01-17 to 28 inches: dark yeilowish-brown (lOYR 4i4i very gravelly sandy loam, yellowish brown (lOYR 5/6) dry; mas- sive; soft, very friable, nonsticky, nonplastic; many root,>: iO perrent gravel: strongly arid: abrupt, smooth boundary. (6 to ] 2 inche;, thick) C2sim-28 tD 45 inches, dark-gray (.51' 4, 1, \'ery gravell~' sand~' loanl, gray (5Y 5/1) dry; massive: extremely hard, extremely finn: strongly cemented: 55 percent gravel; strongly acid: diffuse, smooth boundary. (14 to 20 inches thick! ,C3-4S inches, very compact, weakly cemented glacial till, (Many > feet thick) -B horizons are dark reddish brown to reddish brown, The ,C horizons are 50 to 70 percent gravel and cobbles, The horizon is gray, dark gray, or olive gray and many feet "This soil is medium acid or strongly acid throughout the soil is moderatelv well drained. Permf'abilitv is modrr- apid ahoV(' the ~('mcnted la~'('r. Roots pcn'etratc> Tn :.; f 20 HI 36 inches, This soil holds 2 to 4 indws of watpr :le for plants. Runoff is slow to medium. and thr- , of water erosion is slight to moderate. A perched bIe is rm top of t h(;' cemented la~'rr during the rain~' )1 is used mainly for producing trees and for wild- t and recreation areas, Capability unit VIe-I; group 3d2, ,.~rt very gravell)' sandy loam, 15 to 30 percent }~HoD),-This hilly soil is on glacial terraces. In the ~areas thl' soil is gf'nNally 20 to 24 inches depp to till' " la~'('r. and ill tli(' }O\\"Pr areas it is 24 to 36 indw~ C'thisJawr, dcrlwith this soil in mapping arf' small ar<~as havill~ JL<mlt houlders and basalt bedrock out.crops. Th(> Hoypus series conSists of somewnat eXCeSS1Vf>;': drained, gravelly soils. These soils formed in glacial Out- wash on terraces, Slopes range from 0 to 50 percent, Eleva- tion ranges from 100 to 500 fert, ::\ative vegrtation consists mainly of Douglas-fir. western hemlock. western redcedar. madrone, rhododendron, salal, Orrgon grape, huckleberry, and bracken. Annual precipitation ranges from 18 to 30 inches. The average annual air temperature is about 5O"F. The above 320F growing season ranges frnm 200 to 260 days. and the abovr 280F growing season ranges from 260 to 300 days. These soils are associated mainl~' with Agnf'\\', Alderwood, Cassolary, Carlsborg, Clallam, Dick, Evcrett, Kitsap, and Sinclair soils, In 'a representative profile in a \\'ooded area, about 3 inches of needles, leaves, twigs, and decomposing organic matter cover the surface, The upper 10 inches of the soil is dark-gray and dark-brown gravelly loamy sand, Below this, to a depth of 26 inches, is dark yellm\;sh-brmm gravell~' loam~' sand. The underlying material consists of two dark grayish-browll layprs. The upper la~'er, bf'twccn depths of 26 and 44 inches, is gravelly loam~' sanG.. and the lowrr la~'rr, between depths of 44 and 60 inchc" is \'rr~' gravelly sand. Most of the Hoypus soils are wooded, Besides production of trees, other important uses arc limited pasture. home gardens, and homesites, ' Doypus gravelly loamy sand, 0 to 15 percent slopes (HuC).-This nearly level soil is on rolling glacial moraine tenaces. In most places slopes range from 6 to 12 percent. Representative profile on south side of road in SWUXEUXE% see, 16, T. 26 K.. R. 1 W.: 01-:) inches to 1 inch, needles,leaves, bark. 2.nd lrl1gments of wood, 02-1 inch to 0, blaek (5YR 2/1), panly decomposed organic matter Jromneedles, leaves, bark, and frap:mentsof wood; stronglracid; abruptwll.VY boundan', (~w l~ inches thick) A2-{) to 1}1 inches, dark-gray (10YR 4/1) gravelly loamy sand, gray (lOYR 6/1) dry; weak, fine, granular structure; soft, ~- ~~-,::"-- 26 solIPslniVEY :orrsjf~~~:a~j ~~~~%G@~~J'ld~ ary.(l to 3 inches thick) .'..., ..... .uC'C" .B2Hr-,.,. 1 ~1tolO inches,d&rk-brown {7~5Yltlt/4)gJ:llYeDY lQlijQy. sand, light brown (i.5YR 6!4Jdiy';<reddish-brown'(5XR L'4) stains and coatings on surfaces of pebblesj single grainedj luose, nonsticJ,:y, nonplastic; many fine and medium roots; .t5 percent. gravel: medium acid; clear, wavy boundary, (8 to 12 inches thick) B::!2ir-lO t~ 26 inches, dark yellowish-brown (lOYR 4/4) gravelly loamy sand, light yellowish brown (lOYR 6/4) dry; single grained; loose, nonsticky, nODplasticj common fine roots; iron .and m~nganese stains on some pebbles; 40 ~rcent gr:avel; medIUm aCId; clear, wavy boundary; (12 to 18 mches thick) . (~1-26 to 44 inches, dark grayish-brown (10YR 4/2) gravelly IOllmy sand, light brownish gray (lOYR 6/2) dry; single c:rained: lonse. nonsticky, nonplastic: few fine roots; 45 percent gravel: medium acid: abrupt, wavy boundary, (10 to 20 inches thick' .,':':---4-1 to 50 inches. dark grayish-brown (lOYR 4/2) very gravelly --and, light brownish gray (IOYR 6.'2) dry; single grained: loose, nonsticky, nonplastic: 60 percent gravel; medium acid, The .1.2 horizon is dark-gray to dark grayish-brown gravelly ;"amy sand or sandy loam, The B2 horizons are dark-brown or dark yellowish-brown gravelly loamy sand to gravelly fine sand. They are 35 to 70 percent gravel. The Chorizons are dark-gray or dark grayi.sh-brown gravelly loamy sand or very gravelly loamy sand, In places at depths below 40 inches, there are compacted or weakly cemented layers, The Band C horizons are medium acid to slightly :lcid. Included with thi::; soil in mapping are small area" d :'(,!1lpwhat p(l()rl~' drained heavy silt loam. Thi;; soii is ::;omewn:lt .:-xcessivelv drained. Permeability j- ~'3.pid. Roots penetratt' to a depth of more than 60 inches, TillS soil holds 2 to -I: incnes of water available for plants, Runoff is slow to medium, and the hazard of water erosion is slight to moderate'. This soil is used mainl,' tor production ()f trees. recreation areas, and rural summer homesites, About 10 to 15 percent of the acrC'age is used for gwwing permanent pasture. hay, :me! homp garden "rrJD;;. Caoabilitv unit YIs-1: \\'oodland group 4f2.- ." Hoypus gravelly loamy sand, 15 to 30 percent slopes 'HuDj.-This hilly soil is on glacial outwash terraces where they converge \\'ith the steep ravines and drainageways. Included \vith this soil in mapping are small areas of some- what poorly drained heavy silt loam. Runoff is medium, and the hazard of water erosion is moderate, This soil is used mainly for producing trees and for \\-ildlife habitat and recreation areas, Capability unit Yls-l: woodland group 4f2. Hoypus grayelly loamy sand, 30 to 50 percent slopes :HuE).- This steep soil is on the sides of ravine" ane! \\'::iterwavs odow the terraces. Runoff is medium to rapid, and the hazard of water erosion is moderate to sevprp. This soil is used mainly for production "i trees and for \yildlife habitat and recreation areas. Clp- ability unit VIs-1; \HJodland group 4f2. Roypus gravelly sandy loam, Oto 15 percent slopes (HvC).-Thisnearly level to rollliigsoilis On glacial terraces, The upper 3 to 4 inches of this sOil is gravelly fine sandy loam, Below this is 6 to 9 inches of dark-brown gravellv sandy loam. ' This soil holds 3 to 4 inches of water available for plants. Runoffis slow to medium, and the hazard of watpr erosion isslihtto moderate. .- < . _ ',. .. -itis. used mainli fot:~ . . '-"7'= 'pr tree&. 'and f(ir L ... ..... '.' itat 'and recreational'.. .. .ut.15 to: 2Ocper.;. centqfJije acreage has been cleared:aricl.isti.'3ed for growing permanent pasture, hay, and diversified home garden croptfl;_ Capability unit VIe-I: woodland group 4f2.' .~ Huel Series The Hue! ;;eric.., t, J!1.~16I;, qf lll,xl('rat(~h' well drained soils that formed in alluvium IJIl nearh' leV('l~ low river terraces, Slopes range from I) to :3 rwrc:pnt. Elevation ranges from sea level to 300 feet. .'\ative vegetation consists mostly. of red alder, willO\\', cottonwo(,d, western hemlock, Sitk-a spruce, . bigleaf maple, annual gras"e". and swordfern, Annu&l pre- cipitation ranges from 1~0 t.) 160 inches, The average annual air temperaturp I,; :IOI,W .+9"F. The- above 320F growing season is about 180 day", :i:id dH' :lOOVP :280F growing season is about 210 days. Tiw",., --"ib ar" :l.ssociated \\-ith Hoh and QuePrs soil::,. ' In a representative pronie in :l '-"ooded area, the upper 6 inches of the soil is dark ulive-gra~' loamy fine sand, Beneath this, to a depth of 10 inche5, is dark-gray fine sandy loam, The next layer, extending to a depth of 22 inches, is loamy fine sand, Beneath this, to a depth of 30 inches, is very dark gray very gravelly loamy 5and. Brlow this is very gravelly coarse sand that extends to a dePth of 60 inches. Huel soils are used mainly for' oroduction of trees and for \\ildlife habitat and recreation a;eas. Huel loamv fine sand (HW'!.- This nearlv level soil is un 101\" river 'terracp;;. Th;o 5ur:ace is dissect'cd b,' mam' ;;mall 5tream channel". Ir~ :liO:,I piaces slopes range' irom 0 to :3 percent. Representative profile 100 tPPt east of Spur Road. 200 yards from Queets River R'lad in :\E%SE%NW% sec. 20. T, 24 ;.~., R. 11 \Y.: AI-O TO 6 inches, dark olive-gray '.'iY 3'2) loamy fine sand, light gray (5Y 7/2) dry: weak, coarse, granular structure: soft, verY friable, nonstickv, nonolastic: manv fine and medium roots: mediUm acid: dear. sinooth boundary, (5 to 8 inches thick) Ci-I) to 10 inches, dark-gray {?iY .LT: fine sandy loam. gray (5Y 6'1) dry; weak, thick, platY structure; soft, very friable, nonsticky, nonplastic; many fine and medium roots; medium acid: clear, smooth boundary. (:3 to 6 inches thick) C2-1O to 22 inches, dark-gray (,jY -!/1) loamy fine sand, gray (5Y 6/1) dry; massive: soft, very friable, nonsticky, non- plastic; many fine and medium roots; 6 bands, 7i inch thick, of loamy very fine sand; medium acid; abrupt, smooth bound- ary. (12 to 16 inches thick) IIC3-22 t~ 30 inches, very dark gray (5Y 3/1) very gravelly loamy sand, gray (5Y 6/1) dry; single grained; loose, nonsticky, nonplastic; common fine and medium roots; medium acid; clear, wavy boundary. (8 to 10 inches thick) IIC4-30 to 60 inches, very dark gray (5Y 3/1) very gravelly coarse sand, gray (,jY 6/1' dry: single grained: loose, non- sticky, nonplllStic; few roots; medium acid. The Al horizon is dark olive-gray, gray, or very dark grayish- brown loamy fine sand to fine sandy loam and 10 to 20 percent gravel. The Cl and C2 horizons are very dark gray, dark gray, or very dark grayish brown, They have thin layers of fine sandy loam and loamy fine sand that contain gravel in places. The IlC3 and lIC4 horizons have the same color ranges as the C1 and C2 horizons, They are very gravelly and cobbly coarse sand or very gravelly and cobbly loamy sand with thin layers of finer textures occurring at random. Gravel and cobbles make up 60 to 70 percent of the IIC3 and lIC4 horizons, Included \vith this soil in mapping are small arras of Hoh soils. and Queets soils. . .. ,I}lQQ.~I.:Ilte..ly,wcll,:dJ;ain,ed"k~J:,~~~Y.C': is,. '~:~Wti~\}~f~ot1.~~~~~!ar;J~~ ~fri; plantsi~RUIloff is slow, and the hazard of wntrr {'rosion is -P run-time error F6101: READ (CON) - invalid INTEGER KING COUNTY DEPARTMENT OF PUBLIC WORKS Surface Water Management Division HYDROGRAPH PROGRAMS Version 4.21B 1 - INFO ON THIS PROGRAM 2 - SBUHYD 3 - MODIFIED SBUHYD 4 - ROUTE 5 - ROUTE2 6 - ADDHYD 7 - BASEFLOW 8 - PLOTHYD 9 - DATA 10 - RDFAC 11 - RETURN TO DOS ENTER OPTION: -p run-time error F6101: READ (CON) - invalid INTEGER KING COUNTY DEPARTMENT OF PUBLIC WORKS Surface Water Management Division HYDROGRAPH PROGRAMS Version 4.21B 1 - INFO ON THIS PROGRAM 2 - SBUHYD 3 - MODIFIED SBUHYD 4 - ROUTE 5 - ROUTE2 6 - ADDHYD 7 - BASEFLOW 8 - PLOTHYD 9 - DATA 10 - lU)F:AC 11 - RETURN TO DOS ENTER OPTION: 2 STORM OPTIONS: 1 - S.C.S. TYPE-1A 2 - 7-DAY DESIGN STORM 3 - STORM DATA FILE . SPECIFY. STORM OPTION: l' S.C.S. TYPE-1A RAINFALL DISTRIBUTION ENTER: FREQ(YEAR), DURATION(HOUR), PRECIP(INCHES) 100,24,3.5 ******************** S.C.S. TYPE-1A DISTRIBUTION ******************** ********* 100-YEAR 24-HOUR STORM **** 3.50" TOTAL PRECIP. ********* ENTER: A(PERV), CN(PERV), A(IMPERV), CN(IMPERV), TC FOR BASIN NO. 1 0,80,.1,5 5 DATA PRINT-OUT: AREA(ACRES) .1 PEAK-Q(CFS) .00 PERVIOUS A' CN .0 80.0 T-PEAK(HRS) .00 IMPERVIOUS TC(MINUTES) A CN .1 5.0 5.0 VOL(CU-FT) o ENTER [d:][path]filename[.ext] FOR STORAGE OF COMPUTED HYDROGRAPH: d: junk. dat SPECIFY: C - CONTINUE, N - NEWSTORM, P - PRINT, S - STOP c ENTER: A(PERV), CN(PERV), A(IMPERV), CN(IMPERV), TC FOR BASIN NO. 2 0,80,.1,98,5 DATA PRINT-OUT: AREA (ACRES ) .1 PEAK-Q(CFS) .09 PERVIOUS A CN .0 80.0 T-PEAK(HRS) 7.67 IMPERVIOUS TC(MINUTES) A CN .1 98.0 5.0 VOL(CU-FT) 1185 ENTER [d:][path]filename[.ext] FOR STORAGE OF COMPUTED HYDROGRAPH: d:100yr.dat SPECIFY: C - CONTINUE, N - NEWSTORM, P - PRINT, S - STOP s KINGCQHlfT~)D~~~$NTOFPUBLIC WORKS sir. f. a...'.c"JfijJrI.~~.-~":.'.'.'." . eJnen.t Division ._... '.' .'50......... :.... . . . "'" '~)r.- RAM _ _0 _ " 9 - DATA 10 - RDFAC 11 - RETURN TO DOS ENTER OPTION: 10 RID FACILITY DESIGN ROUTINE SPECIFY TYPE OF RID FACILITY: 1 - POND 2 - TANK 3 - VAULT 6 4 - INFILTRATION POND 5 - INFILTRATION TANK 6 - GRAVEL TRENCH/BED ENTER: EFFECTIVE STORAGE DEPTH(ft) BEFORE OVERFLOW 3 ENTER: VERTICAL PERMEABILITY(min/in) 60 ENTER [d:][path]filename[.ext] OF PRIMARY DESIGN INFLOW HYDROGRAPH: d:l00yr.dat PRIMARY DESIGN INFLOW PEAK = .09 CFS ENTER PRIMARY DESIGN RELEASE RATE(cfs): o ENTER NUMBER OF INFLOW HYDROGRAPHS TO BE TESTED FOR PERFORMANCE (5 MAXIMUM): o ENTER: NUMBER OF ORIFICES, RISER-HEAD(ft), RISER-DIAMETER(in) 1,3,6 ERROR: NUMBER OF ORIFICES MUST BE ZERO IF RELEASE RATE IS ZERO CORRECTION: INPUTTED NUMBER HAS BEEN SET TO ZERO - EXECUTION CONTINUES RISER OVERFLOW DEPTH FOR PRIMARY PEAK INFLOW = .07 FT SPECIFY ITERATION DISPLAY: Y - YES, N - NO Y SPECIFY: R - REVIEW/REVISE INPUT, C - CONTINUE r SUMMARY OF INPUT ITEMS 1) TYJ:?~.QF .f'~9lLITY: GRAVEL TRENCH/BED 2) S'.l'ORAG~ DBPTH{ft): 3.00 3) VERTICALPBRMEABILITY{min/in): 60.00 6) NUMBER OF TEST HYDROGRAPHS: 0 7) NUMBER-OF-ORIFICES, RISER-HEAD(ft), RISER-DIAM(in): 0, 3.00, 6 8) ITERATION DISPLAY: YES ENTER ITEM NUMBER TO BE REVISED {ENTER ZERO..IFNO REVISIONS ARE REQUIRED): o INITIAL STORAGE VALUE FOR ITERATION PURPOSES: 1248 CU-FT ITERATION COMPUTATION BEGINS... TRIAL BOTTOM-AREA STOR-AVAIL STOR-USED PK-STAGE PK-OUTFLOW 1 1386.7 1247 185 .45 .03 2 796.6 716 266 1.11 .02 3 546.1 491 408 2.49 .01 4 499.9 449 437 2.91 .01 5 492.9 443 441 2.98 .01 6 491.9 442 442 3.00 .01 PERFORMANCE: INFLOW TARGET-OUTFLOW ACTUAL-OUTFLOW PK-STAGE STORAGE DESIGN HYD: .09 .00 .00 3.00 442 SPECIFY: D - DOCUMENT, R - REVISE, A - ADJUST ORIF, E - ENLARGE, S - STOP d PERFORMANCE: INFLOW TARGET-OUTFLOW ACTUAL-OUTFLOW PK-STAGE STORAGE DESIGN HYD: .09 .00 .00 3.00 442 STRUCTURE DATA: GRAVEL TRENCH/BED (30 PERCENT VOID VOLUME) RISER-HEAD GRAVEL-BED-AREA STOR-DEPTH STORAGE-VOLUME 3.00 FT 491.9 SQ-FT 3.00 FT 442 CU-FT ROUTING DATA: STAGE(FT) .00 .30 .60 .90 1.20 1.50 1.80 2.10 2.40 2.70 3.00 3.10 3.20 3.30 3.40 3.50 DISCHARGE(CFS) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .15 .42 .52 .60 .67 STORAGE (CU-FT) .0 44.3 88.5 132.8 177.1 221.3 265.6 309.9 354.1 398.4 442.7 442.7 442.7 442.7 442.7 442.7 60.0 MINUTES/INCH AVERAGE VERTICAL PERMEABILITY: PERM-AREA(SQ-FT) .0 491.9 491.9 491. 9 491.9 491. 9 491.9 491.9 491. 9 491.9 491.9 491.9 491. 9 491.9 491.9 491. 9 SPECIFY: F - FILE, N - NEWJOB, P - PRINT IF/OF, R - REVISE, S - STOP r SUMMARY OF INPUT ITEMS 1) TYPE OF FACILITY: GRAVEL TRENCH/BED 2) STORAGE DEJ:',TH{ ft) : 3.00 3) VERTICAL PERMEABILITY(min/in): 60.00 4) PRlMARVDESIGNHYDROGRAPH...FILENAME:: 5) PRIMARY RELEASE RATE(cfs): .00 6) NUMBER OF TEST HYDROGRAPHS: 0 7) NUMBER-OF-ORIFICES, RISER-HEAD(ft), RISER-DIAM(in): 0, 3.00, 6 8) ITERATION DISPLAY: YES d:l00yr.dat ENTER ITEM NUMBER TO BE REVISED (ENTER ZERO IF NO REVISIONS ARE REQUIRED): 2 ENTER: EFFECTIVE STORAGE DEPTH(ft) BEFORE OVERFLOW 4 ENTER: VERTICAL PERMEABILITY(min/in) 60 ENTER: NUMBER OF ORIFICES, RISER-HEAD(ft), RISER-DIAMETER(in) 1,4,6 ERROR: NUMBER OF ORIFICES MUST BE ZERO IF RELEASE RATE IS ZERO CORRECTION: INPUTTED NUMBER HAS BEEN SET TO ZERO - EXECUTION CONTINUES RISER OVERFLOW DEPTH FOR PRIMARY PEAK INFLOW = .07 FT SPECIFY: R - REVIEW/REVISE INPUT, C - CONTINUE r SUMMARY OF INPUT ITEMS 1) TYPE OF FACILITY: GRAVEL TRENCH/BED 2) STORAGE DEPTH(ft): 4.00 3) VERTICAL PERMEABILITY(min/in): 60.00 4) PRIMARY DESIGN HYDROGRAPH FILENAME: 5) PRIMARY RELEASE RATE(cfs): .00 6) NUMBER OF TEST HYDROGRAPHS: 0 7} NUMBER-OF-ORIFICES, RISER-HEAD(ft), RISER-DIAM(in): 0, 4.00, 6 8) ITERATION DISPLAY: YES d:lOOyr.dat ENTER ITEM NUMBER TO BE REVISED (ENTER ZERO IF NO REVISIONS ARE REQUIRED): o INITIAL STORAGE VALUE FOR ITERATION PURPOSES: ITERATION COMPUTATION BEGINS... 1248 CU-FT TRIAL BOTTOM-AREA STOR-AVAIL STOR-USED PK-STAGE PK-QUTFLOW 4 428.3 513 496 3.86 .01 5 420.9 505 507 40.00 .01 6 423.3 507 504 3.97 .01 7 421.7 506 506 40.00 .01 8 422.2 506 505 3.99 .01 9 421.9 506 506 40.00 .01 10 426.2u 511 499 3.91 .01 11 421.3 505 507 40.00 .01 12 422.8 507 504 3.98 .01 13 421.8 506 506 40.00 .01 14 426.4 511 499 3.90 .01 15 421.2 505 507 40.00 .01 16 422.9 507 504 3.98 .01 17 421. 8 506 506 40.00 .01 18 426.4 511 499 3.90 .01 19 421. 2 505 507 40.00 .01 20 422.9 507 504 3.98 .01 21 421. 8 506 506 40.00 .01 22 426.4 511 499 3.90 .01 23 421. 2 505 507 40.00 .01 24 422.9 507 504 3.98 .01 25 421.8 506 506 40.00 .01 26 426.4 511 499 3.90 .01 27 421. 2 505 507 40.00 .01 28 422.9 507 504 3.98 .01 29 421.8 506 506 40.00 .01 30 426.4 511 499 3.90 .01 31 421.2 505 507 40.00 .01 32 422.9 507 504 3.98 .01 33 421.8 506 506 40.00 .01 34 426.4 511 499 3.90 .01 35 421. 2 505 507 40.00 .01 36 422.9 507 504 3.98 .01 37 421. 8 506 506 40.00 .01 38 426.4 511 499 3.90 .01 39 421.2 505 507 40.00 .01 40 422.9 507 504 3.98 .01 41 421.8 506 506 40.00 .01 42 426.4 511 499 3.90 .01 43 421.2 505 507 40.00 .01 44 422.9 507 504 3.98 .01 45 421.8 506 506 40.00 .01 46 426.4 511 499 3.90 .01 47 421.2 505 507 40.00 .01 48 422.9 507 504 3.98 .01 49 421.8 506 506 40.00 .01 50 426.4 511 499 3.90 .01 51 421.2 505 507 40.00 .01 52 422.9 507 504 3.98 .01 53 421.8 506 506 40.00 .01 54 426.4 511 499 3.90 .01 55 421.2 505 507 40.00 .01 56 422.9 507 504 3.98 .01 57 421.8 506 506 40.00 .01 58 426.4 511 499 3.90 .01 59 421.2 505 507 40.00 .01 60 422.9 507 504 3.98 .01 61 42i.8 506 506 40.00 .01 62 4~9.4 511 499 3.90 .01 63 421.2 505 507 40.00 .01 64 422.9 507 504 3.98 .01 65 421.8 506 506 40.00 .01 66 426.4 511 499 3.90 .01 JOB SHEET NO. OF CALCULATED BY DATE ENGINSSIING,-INC. CHECKED BY DATE .____~--- ~-.._._.-.---- - - - -------------------.,..~-~------P--_.---,----_._---~--~-~--~----.------~ ------ ..--------..--~-..--~ .. --.-.--..----- ~+~U;.~_~~_~~_ -, . . . -------- w -z .J e=t2.. .... <..;.;' r:> VI. - _________________~'--_---------~-:__ ._..__.___.__n._......._....___. .___ _ 'E!d.___thr_~. _ m:_____lf1.?J>__~E r ?' 7.- 7 ~_~'t_.im:g,?____m~~n _ ~___~ n_J_~ Lf J ..~..E_ -~-.~---.....---.---.,-...-....-....T-~-.--...--------._.___m______~_____"___._____.________,-..------ ______ .____________t.t___:nz..6lJc....Hre;, ===-?* i 4-'11. ... · (",;0 $. l-f . . ~ _.____---'----_~_~____.___~__.__________m___.__:.... __ ___~.______~__________ -_:=._.-~_~i~.---.=:...-__l~ .~_.]_1'lf__l_~J...___.._==r'~~~ _.___~tl~ _____~'-..__l~_,__~E..._..._.._.._. ;<:' - ---~---~------.-.-._------._-