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BLD2004-00448 Stormwater Management Plan
r M I • THORNDYKE ROAD STORMWATER SITE PLAN RAYMOND AND ARLINE STELK Report Prepared for: 4 •.....„, _. 7.,........._ Raymond &Arline Stelk , Osprey Ridge Road 46, 1.7 k„ Port Ludlow, WA 98365 oFP Q %j '/" August 2, 2004 c,,��'11� tir .01,440 4 a. :„.v..i.,4„. ,./.,,, :,,,, III♦ii"' at:, - f`e. lk rii r' WI" owo J_ q;/6 if Report By: Tillman Engineering P.O. Box 1375 Port Hadlock, Washington 98339 (360) 379-9661 Table of Contents. ,, I. PROJECT OVERVIEW 3 H. PLOT PLAN-(See Attachment 'A', Site Plan) 3 HI. CONDITIONS SUMMARY 3 Subsurface Soil Conditions and Stability 3 IV. OFF SITE ANALYSIS 4 V. ANALYSIS AND DESIGN OF STORMWATER FACILITIES 4 VL SPECIAL REPORTS AND STUDIES 5 VII. BASIN AND COMMUNITY PLANNING AREAS 5 VIIL OTHER PERMITS 5 2.5.1 Minimum Requirement#1:Preparation of Stormwater Site Plans 6 2.5.2 Minimum Requirement#2: Construction Stormwater 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 S.C.S.MAP OF THE PROJECT LOCATION ATTACHMENT II SITE PLANS ATTACHMENT III CALCULATIONS Ray Stelk Stormwater Site Plan (no address assigned)Thomdyke Road Port Ludlow,WA 98365 August 2,2004 Page 2 M • I. PROJECT OVERVIEW ,, The applicant is applying-for a-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 of 2004 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. The 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 Thomdyke 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 on C ditions 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 (A1C), 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 Stability 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. of NTI 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)Thomdyke Road Port Ludlow,WA 98365 August 2, 2004 Page 3 • • - base of the steep slope if possible. Mr.Stelk had an opportunity to pttwhase an easement from the downhill -•property owner but indicated:that costs were too high so as to make that option moot. 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 Drainage 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 Thomdyke 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 Thomdyke 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 15-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)Thomdyke Road Port Ludlow,WA 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,WA 98365 August 2,2004 Page 5 • - • 2.5.1 Minimum Requirement#1: Preparation of Stormmater 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 Thomdyke 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 Thomdyke 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 of BMP 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 of local instability. Notes on the construction plan require stabilization with seeding after the fine grading of the site is done. Hydroseeding will be required if seed has not germinated and the site is re-vegetated by October 15. 2004. Ray Stelk Stormwater Site Plan (no address assigned)Thomdyke Road Port Ludlow,WA 98365 August 2, 2004 Page 6 S • From October 1 through April 30,no.soils shall remain exposed and unworked for more than 2 days.From May 1 to.September 30,no soils shall remain exposed and unworkedlor_ ore4han 7 days.This condition ._. plies t¢-$1} eils=on'site,whether at 1 de''o nat:=Tbese tfiix tiiiuts a lea the oei = - 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. Element 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. Element 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. Element 8: Stabilize Channels and Outlets The permanent surface stabilization consists of one french drain. an interceptor swale with infiltration and general site stabilization. Element 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)Thomdyke Road Port Ludlow,WA 98365 August 2, 2004 Page 7 1.11 • • Element 10: Control De-Watering ighiy turbirfbrbhewrse cvntariiinated aew�teiing wafer,such"as fmm tbnstnichori . 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 existingutilitystructures that do not expose the soil or P 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)Thomdyke Road Port Ludlow,WA 98365 August 2, 2004 Page 8 1111• ID 2.5.3 Minimum Requirement#3:Source Control of Pollution Il tznown;a�va a"bf an reason & sinceeca itrot sliall belt ied'ttr 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 runoff is discharged from the project site must not cause a significant adverse impact to downstream receiving waters and downgradient 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 stormwater runoff 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)Thomdyke Road Port Ludlow, WA 98365 August 2, 2004 Paee 9 ;ASH!NGTnr. — �__ ��D�- • :o 'nee" _- S :J7 FEE .1�.w'f�oK i+ y y _ • . r... r..�,..�,:.Zy c'r' •- ...,- :9•E.�'-. ''0t"s i~ y;y 4. ` •i_ .a.f _7 c ►w._ F .u. x V y•�` • _ a �„ s y 1 F 'k}`.TSsiiw+,��i. _ .-:- ' .. M r , • _ z:, it --.I: '- v� • 'k y, i' - : - : '..,'• . • -- ..- • .,:.-A-3v-:.‘be,4 - '-- - .."— . ..:"=% . -,r ,-_,..... . ..,.._.c„... •,.,........„...a._. ••• ..„.„...,.:4„......... • . • ,. . t.. .. • _ ...,..,... ;.....1.-...0...::...... ,,. ..?...,,. .„.‘ti.. : 0,46,...,.. „,.! ...... .. .. , ._ .• _ . .......:„. ,...... . • . . ... . . . • . .. . ................„..civ... , .„.•,.a.t :4,.. _. .... . .. • ••• . • -...... 3,v -',', 4.1....1. ,C II4,0,foir, ....-..-,irvi. t4"-. -..., : ..- • ,,: . , • . • - • - • i• L LS Yt 4,C • y w.► »ti +5 D � — --, -:•_. ..t1t4 ...•••(1„ • `i k 1 °r ; ° '%,. Z ti } 4 �� ems.`U . y��- 'r•` •.+�., , y. \ %'-'D5u-~` : -es�v...uze4'1i '�o,a,y'-��P��` t • µme' _�j .7." ♦..," ... •,.. �v �,• '` _ 111��� �--�• Kam. .• �:4 o y ' ? 1` '• 7. ids - G 7:-.N ' • � `b+ i�r .y � St y . r yi C. • +t yy . yr y y� • • b• i- •� " 4 { 4. y 1'' 9 . i 7 4 Da0 t 1'2.!....-4..,..' .. ','...... ._ :.r • i..t. - -...0:-..-:::‘:'..\,....._ . - „,,..,,,.,.... --.„-:::, "."-i• -41-' t • I, \ - ,' .... ',7. ..'••• \ t _j ''''.:'_:-.:711‘:;';--.• -Li,...T,:' . ' kii• •, .. .........,,...„.„.,...„,_ .,,..„. _.. ,, . .": _. _ . .. _. r7e7'r r r..'),1f'r•. a i v.. ... c I 4 I. f r • • 411 . . 8 SOIL SURVEY 60 inches. The soil holds 10 or more inches of water svai]pbie reddish brown(5YR 6/4)dry;massive;slightly acid;gradual, for lans. Runoff is slow, and the hazard of water erosion wavy boundary (4 to 12 inches thick) - is slight. A seasonal water table is at a depth of rto 2 feet.' R-38 ocher,basalt.bedrock. :AILIOiI .�.14 peetl>r. o t110 8e ;1& 1jBp2.; 9_. Depth to-basalt bedrock ranges from 24 to 40 inches. The Bir Pasture. hay, and silage from mixed grasses and legumes are �`4trthan Q.0 percent fra- tv i grasalt silt loam.. The C horizon u more than �0 percent fractured basalt bedrock. the principal crops. A variety of garden vegetables, berries, and tree fruits may be grown. Capability unit IIIw-1;wood- Included with this soil in mapping are small areas of land group 3d2. Rock outcrop and of Triton soils. Agnew silt loam, 30 to 50 percent slopes (AgE).— This soil is well drained. Permeability is moderate. Roots This soil is mainly along ocean bluffs or canyon sidewalls. penetrate to the bedrock. This soil holds 2 to 4 inches of The subsoil in many places contains strata of silty clay water available for plants. Runoff is very rapid, and the d loam, fine sandy loam, silty clay, and sandy clay loam. of erosion is very severe. Runoff is rapid. and theYhazard of water erosion is severe. This soil is used mainly for tree production and for wildlife Most area o: this soil are wooded. When used for b(ilding habitat and recreation areas. Capability unit V IIe-1: wood- sites. the soil often slides when saturated. Capability unit land group 3d'2. Vie-1: woodland o-roup 3d2. Ohl-Rock outcrop complex. 50 to 90 percent slopes 'AkF).—This mapping unit is made un of about 50 to 70 percent Ahl very gravelly loam. It is 30 to 50 percent Rock Ahl Series outcrop and stony areas. The Ahl soil is 24 to 30 inches deep in most places. The Ahl series consists of well-drained,very gravelly loam Almost all the acreage of the complex is used for tree soils underlain by basalt bedrock at a depth of 24 to 40 production and for wildlife habitat and recreation areas. inches. These soils are on mountainous terrain. Slopes range Capability unit VIIs-1; woodland group 4x2. from 50 to 90 percent. Elevation ranges from 800 to about 3,000 feet. These soils formed in weathered basalt under a 1derwood Series dominantly coniferous forest of Douglas-fir,western hemlock, and western redcedar.Annual precipitation is 60 to 80 inches. The Alderwood series consists of moderately well drained The average :annual air temperature is about 49°F. The soils that have a very slowly permeable cemented layer at a above :3.2°F growing season ranges from 150 to 190 days, depth of 20 to 40 inches. Slopes range from 0 to 50 percent. and the above 28°F growing season ranges from LSO to 230 Elevation ranges from 100 to 800 feet. These soils formed in days. These soils are associated mainly with Grove, Lystair, glacial till under a forest of mixed coniferous and broad- Olete. and Triton soils. leaved vegetation. Annual precipitation ranges from 25 to In a representative profile a thin layer of organic litter 70 inches. The average annual air temperature is about covers the surface. The upper 3 inches of the soil is dark 49°F. The above 32°F growing season ranges from 160 to reddish-brown very gravelly loam. Below this, to a depth of 960 days, and the above 28°F growing season ranges from 30 inches. is very gravelly loam that is dark red in the upper 220 to 320 days. These soils are associated mainly with part and reddish brown in the lower part. Beneath this, and Beausite. Casey. Clallam, Dick. Everett. Hoypus. Indianola, extending to a depth of 3S inches. is mostly angular basalt Sinclair. and Whidbey soils. pebbles and fractured, weathered basalt. Basalt bedrock is In a representative profile a thin layer of organic litter at a depth of 3S inches. covers the surface. The top 1 inch of the soil is very dark Ahl soils are used mainly for tree production and for wild- grayish-brown gravelly fine sandy loam. Below this, to a life habitat and recreation areas. depth of 12 inches, is dark yellowish-brown gravelly sandy Ahl very gravelly loam, 50 to 70 percent slopes loam. Beneath this layer, and continuing to a depth of 30 (AhF).—Tliis very steep soil is in the mountains inches, is gravelly sandy loam that is brown•in the upper Representative profile in SE4NW3SE3 sec. 34, T. 27 part and dark grayish brown and prominently mottled-in N., R. 2 W., 1.2 miles south of U.S. Highway 101 along the lower part. The next layer is a dark grayish-brown Mt. Walker Road, 15 feet east of road. cemented layer that formed in very compact glacial till. 01-3 inches to 1 inch,needles,leaves, twigs. bark,moss.and frag- Rounded pebbles, cobblestones, and stones are on the surface ments of wood. and throughout the profile. 02-1 inch to 0, decomposing organic litter. Alderwood soils are used mainly for tree production and B21ir-0 to 3 inches, dark reddish-brown (5YR 3.4) very gravelly for wildlife habitat and recreation areas. Less than 30 percent loam, reddish brown (2.5YR 5/4) dry; weak, fine and very fine, granular structure; soft, very friable, slightly sticky, of the acreage is used for growing pasture plants. hay plants, plastic, smeary- many fine, medium, and large roots; 55 per- and diversified farm crops. cent angular basalt pebbles;medium acid:clear,wavy bound- Alderwood gravelly sandy loam, 0 to 15 percent ary. (2 to 6 inches thick) slopes (AIC).—This to 20 inches, dark-red (2.5YR 3/6) very gravelly loam, ( ) —T nearly level to rolling soil is on glacial reddish brown(2.5YR 5/4)dry;weak,fine,granular and sub- terraces. In most places the slope is 5 to 10 percent. angular blocky structure; soft, very friable, slightly sticky, Representative profile 100 yards west of house, southwest plastic, ,many fine, medium, and large roots; 55 per- side of Beausite Lake; SEhNE%SEj sec. 28, T. 29 N., cent angular basalt pebbles and 5 percent rounded pebbles; R. 1 W.: medium acid;gradual,wavy boundary. (10 to 18 inches thick) B3-20 to 30 inches,reddish-brown(5YR 4/4)very gravelly loam, 01-134 inches to 3.inch,needles,leaves,bark, and fragments of light reddish brown (5YR 6/4) dry; massive; soft, friable, wood. nonstuky,nonplaatic,'Revery;common.fine rootq;?0 02-Mnch to 0 black 5YR 2/1)part' .decayid.leaves,needles, 6 pebbles;�ghyacid;gradual,wavy- bark ate nustiie,ta send; e►binpit w Y mar asap boles� tl wa fgto 12 inches thick) ,_._.. C-30 to 38 inches 90 percent fractured basalt bedrock:Material A2— m , very - ."gisyish-brown (10YR 3/2) gravellyin voids is reddish-brown (5YR 4/4)very gravelly loam,light fine sandy loam,pale brown(10YR 6/3)dry;weak,very fine, t j! 411 • . JEFFERSON COUNTY AREA.; WASHINGTON 9 granular structure; softy very. friable, r16naticlry and nOn- l 15 to 30 percent slopes, plastic; many fine and medium roots;, pebas well as small areas of mednua..a44e fear ran .1 Ot , Everett. Indi Hoypns nclair and _ _ � so may-.- - a'F �. ! _- '' - K t t 9 3 .,3 y; + ' Tr. $�,, _- __ - .Rii _ 1�r�Cp _ w =• r-•` ';-max - Ste. ..f 3 r� - ffi1`S ld, a$ 1e 38Z8 d=of Water erosion-is'severe:' _ _'"7" Y 19 used for tree production and for wildlife habitat Plasteo;.many . a ani 1tun Toots; common hard 1fon- and recreation areas. Capability unit VIe-1•woodland group t , manganese coneretions; 40 percent gravel; medium acid; p gradual,wavy (4 to 6 inches thick) 3d2. ",.,“;.:,,i- —6 to 12 inches,darkyellowish-brown(10YR 4/4)gravelly Alderwood gravelly loam, 0 to 15 percent slopes .; sandy loam,pale brown(10YR 6/3)dry,weak,fine,subangu- (AmC).—This nearly level to rolling soil ison glacial terraces. lar blocky structure;slightly hard,friable,slightly sticky and slightly plastic; many fine and medium roots; common bard The surface layer and subsoil are gravelly loam. iron-manganese concretions;40 percent pebbles;slightly acid; Included with this soil in mapping are small tracts having " clear,wavy boundary. (5 to 7 inches thick) shale or sandstone at a depth of 20 to 36 inches.B3-12 to 21 inches, brown(10YR 4/3)gravelly sandy loam, ale, i brown 10YR 6/3) dry; weak, p Permeability is moderate. This soil holds 3 to 6 inches of ( hard, , s fine, subangularticky, slightly blocky attic: - water available for plants. tune; slightly hard, friable, slightly sticky, slightly plastic; many fine and medium root,;45 percent gravel;Tightly acid; This soil is used mainly for tree production and for wildlife clear, smooth boundary. (6 to 12 inches thick) habitat and recreation areas. Capability unit IVe-1: wood- C1-21 to 30 inches, dark grayish-brown (10YR 4/2) gravelly land group 3d2. sandy loam,light gray(10YR 7/2)dry;many medium romt- nent, yellowish-red (5YR 4/6) mottles; massive; hard, firm, Alderwood gravelly loam, 15 to 30 percent slopes slightly sticky, slightly Mastic; few fine and medium roots; (AmD).—This moderately steep soil is in areas where the 45 percent gravel; medium acid; gradual, wavy boundary. rolling upland glacial terraces convey e with the stee(4 to 16 inches thick) g p C2sim�0 to 48 inches, darkdrainageway ravines. The surface layer and subsoil are cemented gravellylam grayish-brown (IOYR 4/2) weakly gravelly loam. sandy lightgray (10YR 7/2) dry; many coarse, prominent, yellowish-red (5YR 4/6) mottles; This soil holds 3 to 6 inches of water available for plants. massive; extremely hard, extremely firm: no roots; slightly Permeability is moderate. Runoff is medium to rapid, and acid. (10 to 18 inches thick) the hazard of erosion is moderate to severe. C3-48 inches,very compact gravelly sandy loam glacial till.(Many This soil is used mainly for tree production and for wildlife feet thick) habitat and recreation areas. Capability unit V'Ie-1;woodland The depth to the cemented layer ranges it:::. 2u r.;, 40 inches. group 3d2. The A2 and B2ircn horizons range from very dark grayish brown Alderwood_Quilcene complex. 0 to 15 percent slopes to dark yellowish brown. Their content of coarse fragments ranges • from 20 to 50 percent and averages more than 35 percent.In places (AuC).—This mappllzg unit is made up of about 60 percent. the upper part of the Cl horizon is compact gravelly loamy sand. Alderwood gravelly sandy loam, 0 to 15 percent slopes, and ,_ 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. "Small areas of sandy, very gravelly. ,r cobble soils are The nearly level to strongly sloping Quilcene soil is mostly it�id+tded with this soil in mapping. in areas adjacent to the moraines. About 10 percent of the '7-This soil is moderately well drained. Permeability abo• acreage is Everett. Ho}pus, and Indianola soils. the cemented layer is moderately rapid. Roots penetrate to Most of this acreage is wooded. • small acreage has been fi cemented layer and flatten out on top of it. A perched cleared and planted to pasture. Capability unit IVe-1; ' r table is above the cemented layer during the winter woodland group 3d2. This soil holds 2 to 4 inches of water available for i i Runoff isslow to medium, and the hazard of water Beausite Series `6 d is slight to moderate. The Beausite series consists of well-drained soils underlain v.y , =._soil is used for permanent pasture of mixed grasses by strongly cemented sandstone conglomerate at a depth of , es. Both hay and silage are commonly produced. 20 to 36 inches. They are on the sides of valleys, mostly grains, vegetables, berries, and fruit trees are also south and southeast of Discovery Bay in the northeastern '`'Capability unit IVe-1:woodland group 3d2. part of Jefferson County. Slopes range from 0 to 50 percent. ' °erwood gravelly sandy loam. 15 to 30 percent Elevation ranges from 50 to 1.500 feet. These soils formed • (AID).—This moderately steep soil i.- in places where under a dominantly .coniferous forest in weathered con- rolling glacial upland terraces converge toward ravines glomerate consisting of mixed acid and basic rocks. Annual andsteep drainageways' precipitation ranges from 30 to 40 inches. The average 'runoff is medium to rapid. and the hazard of water annual air temperature is about 50°F. The above 32°F ein is moderate to severe. This soil is used mainly for growing season ranges from about 220 to 250 days, and the «reduction and for wildlife habitat and recreation areas. above 28°F€� _' suited to permanent hay and pasture crops. Capa- days. These soills arePassociated mason ranges fainly rom about with Alder ood, t.`"t VIe-1; woodland nd group 3d2. Everett, Indianola, Quilcene, ils. . ood gravelly sandy loam, 30 to 50 percent In a representative profile a thin layer Sinclair oof organic litter • (AIE).—This steep soil is on glaciated uplands, covers the surface. The upper 22 inches of the soil is gravelly :.Ns.`_-., y in small areas along steep morainal margins or sandy loam that is dark brown in the upper part and dark of _ sidewalls. On the upper third of the slopes, the • • layer and subsoil are often 20 to 24 inches thick 33h inches,owish bis brown rown in tand grayish-brown Belowhe lower part. ry gravell to a ly sandy the cemented layer. Along the bottom slopes, depth to loam. Beneath this layer is strongly cemented, very gravelly s<_-' „•ntc•d layer is 30 to 40 inches. sandstone co merate. t; uuded with this soil in mapping are small areas of '••• gravelly sandy loam and Alderwoodgravelly Butt; are used mainly for tree production and for wiltflifd` tlrat and recreation areas. • • _s • t.l 18 SOIL SURVEY blocky structure; soft, very friable, nonsticky, nonplastic•. Representative profile 1.4 miles up the Maple Creek Road common 8 inc fia and medium roots;neutral;dear,wavy boundary and show:--the road, '_\"W3SW3SW3 sec. 12, T. 26 N., - au YsJd}Iho :R.-‘1.1rJ :: , = - • - 4e y ('‘ It:6 dij; few, fwe;'p t11146 Ol 2 inches to 1 inch,seat$' Z7.5YR 4/4) mottles; single grained; loose, nonsticky, non �+ fragments of partly wood,and moss. plastic; few fine and medium roots; neutral; gradual, wavy02-1 inch to 0,dark reddish-broom wood, and2), decomposed boundary. (12 to 16 inches thick) needles, bark, fragments of and moss; very strongly C2-24 to 37 inches, ol6,inch s wnthi (2.5Y 4 4) loamy sand, light acid;abrupt,smooth boundary. (1 to 2 inches thick) brownish gray(2.5Y 6/2)dry;single grained;loose,nonsticky, A1-0 to 3 rown'(1Ydark-brown5/3) (ry; der3/3 very ftagnv silty clay nonplastic; few fine and medium roots; neutral; clear, wavy loam, brown (lOYft slightly dry; moderate, fine and medium, boundary. (12 to 16 inches thick) structure; hard, friable, slightly sticky, C3-37 to 60ar inches,light olive brown(2.5Y 5?4)loamy sand,very slightly plastic;many fine,medium and coarse roots;45 percent pale brown (10YR 7/3) dry:single sandstone fragments;strongly acid;gradual, wavy boundary. g grained:loose, nonsticky. (1 to 5 inches thick) nonplastic: few fine and medium roots: common coarse, dis- B2-3 to 16 inches,dark-brown (7.5YR 4/4)very flag •silty clay tinct., dark yellowish-brown (10YIt 4 4). discontinuous ion loam, light yellowish brown (10YR 6/4) dry; moderate, me- bands:neut ral. dium, angular blocky structure;slightly hard.friable.slightly Reaction of the A and B horizons ranges from neutral to medium sticky, slightly plastic: common fine. medium, and coarse acid. The 2 horizor. is grayish-brown or light brownish-gray roots; 75 percent sandstone fragments: medium acid: clear. loamy sand or sandy loam. The B and C horizons are loamy sand wavy boundary. (9 to 15 inches thick) or fine sand. Very thin. finer textured iron bands are between R-16 to 60 inches, dark-brown (7.5Y R 4/4) shale and sandstone depths of 40 and 60 inches. bedrock. This soil is somewhat excessively drained. Permeability is Depth to bedrock ranges from 10 to 20 inches.The A horizon is rapid. Roots penetrate to a depth of more than 60 inches. very dark grayish-brown or dark-brown flaggy or very flagg-t•silty This soil holds about 4 to 6 inches of water available for day loam. The B2 horizon is 50 to 80 percent coarse fragments. plants. Runoff is slow. and the hazard of water erosion 1 The soil material in this horizon is dark-brown, brown, and dark yellowish-brown very flagin-silty clay loam and clay loam. The A alight. horizon ranges from very strongly acid to strongly acid, and the B This soil is used mainly for production of trees and for horizon ranges from strongly acid to medium acid. is recreation areas and wildlife habitat. Small acreages under As much as 20 percent of some areas consists of inclusions l` p cultivation are used for growing permanent pasture. hay. of Solleks or Snahopish soils. Small areas of rock nutcron berries, and vegetables. Capability unit VIs-1: woodland group 4s2 are also included. This soil is somewhat excessively drained. Permeability is p moderate. Roots penetrate to bedrock. This soil holds 1 to _' :+ Dimal Series inches of water available for plants. Runoff is very rapid. and the hazard of water erosion is very severe. The Dimal series consists of somewhat excessively drained, This soil is used for production of trees and for tt-iidiii. vely flaggy soils underlain by bedrock at a depth of 10 to 20 habitat and recreation areas. Capability unit V'Ils-1: wood- inches. These soils formed in some of the harder meta- land group 4d1. morphosed sandstones and shale bedrock materials of the western Olympic Mountain foothill areas. Dimal soils are on=rough,broken mountain slopes and narrow, exposed ridge Everett Series cne::Sl©pes range from 50 to 90 percent. Elevation ranges from-about 1,000 to 3.400 feet. Native forest trees consist The Everett series consists of somewhat excessively • mostly of western hemlock, western redcedar. and Sitka drained, gravelly soils. They formed in glacial outwash on spruce below elevations of 1.500 feet and Pacific silver fir, terraces with steep escarpments. Slopes range from 0 to 50 • western hemlock. mountain hemlock, and alpine fir at the percent. Elevation ranges from slightly above sea level to higher-elevations. Annual precipitation ranges from 140 to about 500 feet.Native vegetation consists mainly of Douglas- 18Q•_inches. The average annual air temperature is about fir, western hemlock, western redcedar, rhododendron. ma- 4 F. The above 32°F crowing season ranges from 170 to drone,salal,huckleberry,Oregon grape, pea and bracken.Annual 200 days, and the above 25°F growing season ranges from precipitation ranges from 26 to 35 inches. The average 180 to 220 days. The ,- soils are associated with Itstvoot. annual air temperature is about 50°F. The above 32°F Snahopish. and Solleks s:'its. growing season ranges from about 200 days, and the abnyc In a representative pron.:, it: r, wooded area. about 3 28°F growing season ranges from about 2S0 to 300 day inches of litter and decomposing materials cover the surface. These soils are associated mainly with Alderwood. Carisborg. The upper 3 inches of the soil is dark-brown.very flaggy silty Cassolary, Hoypus, Indianola. I itsap. and Sinclair soils. clay loam. Below this. to a depth of 16 inches, the soil is In a representative profile 2 to 3 inches of forest litter are dark-brown, very flaggy silty clay loam that is about 75 decomposing organic matter cover the surface. The upper percent coarse sandstone fragments.Bedrock is below a depth 6 inches of the soil is dark-brown gravelly sandy loam.Below of 16 inches. this, to a depth of 16 inches, is dark-brown gravelly sandy The Dimal soils are among the principal ones of the loam. Next, to a depth of 26 inches, is light olive-brown higher, steeper, mountainous areas in the western part of gravelly loamy sand. Beneath this, and extending to a depth the county. They are used for production of trees, wildlife of 48 inches, is dark grayish-brown very gravelly medium: habitat, and recreation areas. and coarse sand. Below this. to a depth of 60 inches. i,- Dimal very flaggy silty clay loam. 50 to 90 percent grayish,brown fine and medium sand. elopes (OMF).—This steep to very steep soil is on rough, Everett soils are used mainly for production of trees. broken,mountainous slopes and narrow ridge crests. In most .Everett gravelly sandy loam, 0 to 15 percent slopes slopes range from 70 to 80 percent, but on ridge (; .=This nearly level to rolling soil is on glacial outwash Trots they are mostly 50 to 60 percent. In most places slopes range from 4 to 10 percent. �d' AM IF 20 III ill plants. Runoff is slow, and the hazard of water erosion .- welly slight.to moderate. tine, is,soil is used mainly for production of trees, %r,'id L;tic; 'This, --habitat,and recreation=reas. Atoro*thiately 20 pereen iium the acreage of this soil has been cleared and is us(t.i ..,,iiv growing permanent (fig. 2) pasture, hay, and diver-1. ::ne<i; garden crops. Capability unit VIe-1; woodland group 3f_ ai Everett gravelly sandy loam, 15 to 30 percent slop. - 13^ EvD).—This hilly soil is on glacial outwash moraine terra:- where they converge with the steep ravines and drainagevi • Runoff is slow to medium, and the hazard of water errsi, is slight to moderate. This soil is used mainly for product: -f trees and for wildlife habitat and recreation arr'a . __.t - • biiity unit VIe-1; woodland group 3f2. - �' Everett gravelly sandy loam, 30 to 50 percent le►ue • EvE t —This steep soil .s on the sides of ravines an(i -1- -.rays below the hilly glacial terraces. Runoff is medium, and the hazard of water rest;:_ - moderate. This soil is used mainly for production :,t -:• - and for wildlife habitat and recreation areas. Capabi i unit VIe-1;woodland group 3f2. r° . S - Grove Series ,• • , The Grove series consists of somewhat excessively drain and well drained2 very gravelly soils. These soils formed IL glacial outwash on terraces and plains. Slopes range f:cr_. 0 to 50 percent. Elevation ranges from slightly above sr level to about 500 feet. Native vegetation consists mostly ", Douglas-fir, western hemlock, white pine, some western red- cedar, and an understors-mostly of salal, bracken, evergreen z.41 .; , _ huckleberry, and rhododendron. Annual precipitation ranges rF from 60 to 120 inches. The average annual air temperatu_ "• is about 50°F. The above 32°F o b s about 160 to days, and the above 28s F growing season ' ranges from about 210 to 250 days. These soils are associated ' �,. mainly with Ahl, Hoodsport, Lystair, and Olete soils. s • In a representative profile (fig. 3) about 2% inches needles, twigs,leaves, and partly decomposed organic matter r`_ cover the surface. The upper 12 inches of the soil is darn reddish-brown very gravelly loamy sand. Below this, to a depth of 27 inches, is reddish-brown very gravelly coarse_'. sand. Beneath this, and extending to a depth of 40 inches. ••• is dark-brown very gravelly sand. Below this, to a depth of 60 inches, is very dark grayish-brown gravelly coarse sand. Glacial cobbles are on the surface and throughout the profile in places. ..:;-:."::-.•"-i7': , Most of the Grove soils are wooded. Besides their use for production of trees, another important use is for summer homesites. Grove very gravelly loamy sand, 0 to 15 percent slopes (GoC).—This soil is on glacial terraces and outwa a P; 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 SEINE3NW3j sec. 13. T. 26 N., R. 2 W.: 01-2.31 inches to 1 inch,needles,twigs,and leaves. 02-1 inch to 0, black (5YR 2/1), partly decomposed organic matter from needles, twigs, and leaves;strongly acid:abrun-. smooth boundary. . 't i 14te oiitside , ,Fib ,- •_ ile series Ty coii ortdated sub, •,"; stratum at a depth of 30 to 40 inches.Thi,Cdifference does not alter the[. usefulness, and it affects their behavior only to a minor extent. "` tu,- a refer loam,ti -and. 0 to 15 . r..ro�• crier in ,lru•:: .: t�•et. 1111 • JEFFERSON COUNTY AMU, WASHINGTON 2a f:, ' •• 50°F. The above 32°F growing .ranges m is-mediu , and the hazard of water erosion is •• o -150 to 200 days, and the above 2 growing gmoderate: This soil is used mainly for producing trees and ,, v ,from.about_200 t o 240 days, These soils are. for ildlife:habitat ynd recreation areas. Capability unit .., „ - � _41W4 i, Ole# , and" #r .k" "a �_ • t _ .�.,...1: -- - - ,; , :la percent slopes' • esentative profile about-3-inches of needles, `T nearly level to rolling soil is in small, isolated -bark,.'and humus cover the surface. The upper 17 areas -on:glacial terrace ridgetops. Elevation ranges from ,' . .f the soil is reddish-brown very gravelly sandy loam. 300 to 500 feet. The upper 12 inches or more is dark reddish- to a depth of 28 inches, is dark yellowish-brown brown gravelly loam. Reaction is slightly acid to medium t:sandy loam. Beneath this is a very dark gray ce- acid. Permeability is moderate above the cemented layer. ---'".'layer. Glacial cobbles and stones are present on This soil holds about 3 to 5 inches of water available for ^: `i,. ;ce and throughout the soil. plants. .. ''- y all of the Hoodsport soils are wooded. Besides This soil is used mainly for production of trees for - ►ruction of trees. another important use is for rural wood- wildlife habitat and recreation areas. Capability unit IVe-1: 9yidiaitomesites. woodland group 3d2. t.`; .. port very gravelly sandy loam, 0 to 15 percent Hoodsport-Grove very gravelly sandy loamy, 0 to 30 -1:-- In most places slopes range from 6 to 12 percent. about equal proportions of Hoodsport very gravelly sandy c:-= •a tative profile 60 feet west of U.S. Highway 101 loam, 0 to 15 percent slopes, and Grove very gravelly loamy . i Yards south and 120 yards west of SE3SW%corner sand, 15 to 30 percent slopes. The Hoodsport soil is mostly : 9,T: 25 N., R. 2 W.: undulating to gently rolling, and the Grove soil is mostly 0. -2 itches to 1 inch, needles,leaves, wood, and bark. hilly. This complex is used mainly for production of trees and 02 leaves,• to 0, black (5YR 2/1) partly decomposed needles, for wildlife habitat and recreation areas. Capability unit wood,and bark;strongly acid;abrupt,smooth bound- P ary. (4 to 2 inches thick) VIe-1; woodland group 3d2. B21ir--0 to 6 inches, reddish-brown (5YR 4/4) very gravelly sandy loam, reddish brown (5YR 5/4) dry; weak, medium and coarse, granular structure: soft, very friable, nonsticky, Hoypus Series nonp.iastic: many roots: 60 percent gravel; strongly acid: . gradual. wavy boundary. (4 to 6 inches thick) B22ir-6 to 17 inches, reddish-brown (5YR 4,4' very gravelly The Hoypus series consists of somewhat excessively sandv loam; reddish brown (5).'R 5/4) dry; weak, fine and drained, gravelly soils. These soils formed in glacial out- medii:m, subangular blocky structure;soft, very friable, non- washon terraces. Slopes range from 0 to 50 percent. Eleva- sticky, nonplastic; many roots: 60 percent gravel: strongly acid:gradual.wavy boundary. (10 to 16 inches thick') Lion ranges from 100 to 500 feet. Native vegetation consists C1-17 to 28 inches, dark yellowish-brown (10YR 4/4) very mainly of Douglas-fir. western hemlock. western redcedar, gravelly sandy loam, yellowish brown (10YR 5,6) dry; roes- madrone, rhododendron, salal, Oregon grape, huckleberry, sive: soft, very friable, nonsticky, nonplastic: many roots; and bracken. Annual precipitation ranges from 18 to 30 - 70 percent gravel; strongl .y acid: abrupt, smooth (6 to 12 inches thick) inches. The average annual air temperature is about 50o F. 22sim— ;o 45 /" 32°F season ;room 25 inches, al 4 I, veryTheto gravelly sandy above 32 F growing ranges ..nm 200 _6 dark-gray 0 g loam, (5Y 5/1) dry:massive:extremely hard, extremely 28°F 2 gray days, and the above 28 F growing season ranges from _60 firm: strongly cemented; 55 Percent gravel; strongly acid: to 300 days. These soils are associated mainly with Agnew .. diffuse,smooth boundary. (14 to 20 inches thick) � .C3-�15 inches, very compact, weakly cemented glacial till. (Many Alderwood, Cassolary. Carlsborg, Clallam. Dick. Everett, feet thick) Kitsap, and Sinclair soils. In a representative profile in a wooded area, about 3 .: 'The B horizons are dark reddish brown to reddish brown. The inches of needles, leaves, twigs, and decomposing organic C horizons are 50 to 70 percent gravel and cobbles. The horizon is gray, dark gray, or olive gray and many feet matter cover the surface. The upper 10 inches of the soil is . _` This soil is medium acid or strongly acid throughout the dark-gray and dark-brown gravelly loamy sand. Below this, -�`' to a depth of 26 inches, is dark yellowish-brown gravelly •• is moderately well drained. Permeability is modes loamy sand. The underlying material consists of two dark c ..:pid above the cemented layer. Roots penetrate to a grayish-brown layers. The upper layer. bettiycen depths of -r.,.,of d a 36 inches.This cemented holds 2 to 4 inches of water a 26 and 44 inches.is gravelly loamy sand.and the lower layer. i. • "'S`,e for plants. Runoff is slowtto medium. and the between depths of 44 and 60 inches. is very gravelly sand. of water erosion is slight to moderate. A perched Most of the Hoypus soils are wooded. Besides production ;r- of trees, other important uses are limited pasture. home _ta:hie is on top of the cemented layer during the rainy gardens, and homesites. - -:•il is used mainly for producing trees and for wild- us gravelly loamy sand, 0 to 15 percent slopes • _. •t and recreation areas. Capability unit VIe-1; (HuC).—This nearly level soil is on rolling glacial moraine terraces. In most places slopes range from 6 to 12 percent. ,,, • _.group 3d2. Representative profile on south side of road in ;� •,,t very gravelly sandy loam, 15 to 30 percent SW�\E� E1/ sec. 16, T. 26 :�.. R. I I'i .: 's ).—This hilly soil is on glacial terraces. In the areas the soil is generally 20 to 24 inches deep to the O1—:3 inches to 1 inch,needles,leaves,bark.and fragments of wood. layer, and in the lower areas it is 24 to 36 inches 02-1 inch to 0, black (5YR 2/1), partly decomposed organic • matter from needles, leaves, bark, and fragments of wood;this~ layer. , strongly acid;abrupt,wavy boundary.( g to 154 inches thick) -- _, dtxi with this soil in mapping are small areas having A2-0 to 1 H inches, dark-gray (10YR 4/1) gravelly loamy sand, ,-. - It boulders and basalt bedrock outcrops. gray (10YR 6/1) dry; weak, fine, granular structure; soft, III • 26 BQIgr--t1DHVEY j.: very friable, noasiieky, nonelastic,maay.fine lAtir roots;35 percent gravel;strongly acid permanent pasture, hay, and diversified home garden > >:` ary. (l to 3 inches thick) _ - Capability unit `'Ie-1; woodland group 4f2. B21ir-1 r to 10 inches, dark-brown (7.5YR 4/4)_grave*loujny sand,' t-bri n (7.5YR' 6/4) dry neddii-br (SYit' - 4/4)stains and coatings on surfaces of pebbles;single grained; Hues Serie. loose, nonsticky, nonplastic; many fine and medium roots; 45 percent gravel;medium acid; clear, wavy boundary. (8 to The Huel series c„ISiats of moderately well drained soils 12 inches thick) that formed in alluvium on nearly level, low river terraces. B''2ir-10 to 26 inches,dark yellowish-brown(10YR 4/4)gravely loamy sand, light yellowish brown (10YR 6/4) dry; single Slopes range from 0 to 3 percent. Elevation ranges from grained; loose, nonsticky, nonplastac; common fine roots; sea level to 300 feet. Native vegetation consists mostly of iron and manganese stains on some pebbles;40 percent gravel; red alder,willow,cottonwood, western hemlock,Sitka spruce, medium acid;clear,wavy boundary; (12 to 18 inches thick) bigleaf male, r'1-26 to 44 inches, dark grayrish-brown (10YR 4/2) gravelly g. P annual grasses, and ses.The Annual pre- loamy sand, light brownish gray (10YR 6/2) dry; single cipltation ranges from 120 to 160 inches.The average annual _rained:loose.nonstickv,nonplastic:few fine roots;45 percent air temperature is abort 49°F. The above 32°F growing gavel;medium acid:abrupt,wavy boundary. (10 to 20 inches season is about 180 flays. and the above 28°F growing season thick., _"'-14 to 60 inches.dark grayish-brown(10YR 4;2)very gravelly is about 210 days. These soils are associated with Hoh and sand.light brownish gray(10YR 6 2)dry;single grained:loose, Quests soils. nonstickv, nonelastic:60 percent gravels;medium acid. In a representative pronie in a wooded area, the upper 6 inches of the soil is dark olive-gray loamy fine sand. Beneath The A2 horizon is dark-way to dark grayish-brown gravelly this, to a depth of 10 inches, is dark-gray fine sandy loam. loamy sand or sandy loam.The B2 horizons are dark-brown or dark The next layer, extending to a depth of 22 inches, is loamy yellowish-brown gravelly loamy sand to gravelly fine sand. They P are 35 to 70 percent gravel.The C horizons are dark-gray or dark fine sand. Beneath this, to a depth of 30 inches,is very dark grayish-brown gravelly loamy sand or very gravelly loamy sand. gray very gravelly loamy sand. Below this is very gravelly in places at depths below 40 inches.there are compacted or weakly coarse sand that extends to a depth of 60 inches. cemented layers.The B and C horizons are medium acid to slightly Huel soils are used mainly for production of trees and for acid. wildlife habitat and recreation areas. Included with this soil in mapping are small areas of Huel loamy fine sand (HW).—This nearly level soil is somewhat peony drained heavy silt loam. on low river terraces. The surface is dissected by many This soil is somewhat •:xcessively drained. Permeability small stream channels. In most ;daces slopes range from 0 is rapid. Roots penetrate ro a depth of more than 60 inches. to 3 percent. This soil holds 2 to =1 inches of water available for plants. Representative profile 100 feet east of Spur Road. 200 Runoff is slow to medium. and the hazard of water erosion yards from Queets River Road in .E1/SE34 W% sec. 20, is slight to moderate. T. 24 N.. R. 11 W.: This soil is used mainly for production of trees. recreation AI-0 to 6 inches. dark olive-gray �;5I 3 ":.') loamy fine sand,light areas, and rural summer homesites. About 10 to 15 percent gray (5Y 7/2) dry; weak, coarse, granular structure; soft, of the acreage is used for growing permanent pasture. hay. very friable, nonstickv, nonplastic: many fine and medium and home garden crops. Capability unit VIs-1: woodland roots; medium acid: clear. smooth bounden. Co to S inches zroup 4f2. Cif )to 10 inches, dark-gray (5Y 4;'l) fine sandy loam. gray Hovpus gravelly loamy sand, 15 to 30 percent slopes .aY 6:1) dry;weak, thick, platy structure;soft, very friable, +HuD).—This hilly soil is on glacial outwash terraces where nonsticky, nonplastic;many fine and medium roots;medium they converge with the steep ravines and drainageways. acid;clear,smooth boundary. (3 to 6 inches thick) Included with this soil in mapping are small areas of some- C2-10 to 22 inches, dark-gray (5Y 4/1) loamy fine sand, gray (5Y poorly drained heavy silt loam. 6/1) dry; massive; soft, o friable, nonsticky,ch non- whatthick, plastic;many fine and medium roots;6 bands, X inch thick, Runoff is medium, and the hazard of water erosion is of loamy very fine sand:medium acid;abrupt,smooth bound- moderate. This soil is used mainly for producing trees and (12 to 16 inches thick) forfor wildlife habitat and recreation areas. Capability unit IIC3-22 to 30 inches, very dark gray (5Y 3/1) very gravelly 'w woodland group 4f2. loamy sand,gray(5Y 6/1)dry;single grained;loose,nonstickv, nonplastic; common fine and medium roots; medium acid; Hovpus gravelly loamy sand, 30 to 50 percent slopes clear,wavy boundary. (8 to 10 inches thick) HUE).—This steep soil is on the sides of ravines and IIC4---30 to 60 inches, very dark gray (5Y 3/1) very gravelly waterways below- the terraces. coarse sand, gray (5Y 6/1) do; single grained; loose, non- Runoff is medium to rapid,and the hazard of water erosion sticky, nonplastic;few roots;medium acid. re is moderate to seven. This soil is used mainly for duction The Al horizon is dark olive-gray, gray, or very dark grayish- re brown loamy fine sand to fine sandy loam and 10 to 20 percent r.)f trees and for wildlife habitat and recreation areas. Cap- gravel.The Cl and C2 horizons are verydark ability unit VIs-1; woodland group 4f2. ver.dark n gray,dark gray,yloam or y grayish brown.They have thin layers of fine sandy Hovpus•gravelly sandy loam, 0 to 15 percent slopes and loamy fine sand that contain gravel in places. The IIC3 and (HVG) This nearly level to rolling sell is on glacial terraces. I1C4 horizons-have the same color ranges as the Cl and C2 horizons. They are very gravelly and cobbly coarse sand or very gravelly The upper 3 to 4 inches of this soil is gravelly fine sandy and cobbly loamy sand with thin lavers of finer textures occurring loam. Below this is 6 to 9 inches of dark-brown gravelly at random. Gravel and cobbles make up 60 to 70 percent of the sandy loam. IIC3 and 1IC4 horizons. This soil holds 3 to 4 inches of water available for plants. Included with this soil in mapping are small areas of Runoff is slow to medium, and the hazard of water erosion Hoh soils and Queets soils. is s t to moderate. -R t . w mQd tat ,.: [Ell r 1ty_is _is used mainly for:. _. �.tr�B. `for -__ � _ . a list and recreation t 15 t. 20.per- s"' '. -aboutta. ,� 'cap offor yen of;the acreage has been cleared and is used for growing plants. Runoff is slow, and the hazard of water erosion is R• t cz P . run-time error F6101: READ(CON) - invalid INTEGER 0 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 4.21E 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: 2 STORM OPTIONS: 1 - S.C.S. TYPE-lA 2 - 7-DAY DESIGN STORM 3 - STORM DATA FILE SPECIFY STORM OPTION: 0 1 S.C.S. , TYPE-lA RAINFALL DISTRIBUTION ENTER: FREQ(YEAR) , DURATION(HOUR) , PRECIP(INCHES) 100,24,3.5 ******************** S.C.S . TYPE-lA 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) PERVIOUS IMPERVIOUS TC(MINUTES) A CN A CN . 1 .0 80.0 . 1 5.0 5.0 PEAK-Q(CFS) T-PEAK(HRS) VOL(CU-FT) .00 . 00 0 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) PERVIOUS IMPERVIOUS TC(MINUTES) A CN A CN . 1 .0 80.0 . 1 98.0 5.0 PEAK-Q(CFS) T-PEAK(HRS) VOL(CU-FT) .09 7 . 67 1185 ENTER [d: ] [path]filename[ .ext] FOR STORAGE OF COMPUTED HYDROGRAPH: d: 100yr.dat SPECIFY: C - CONTINUE, N - NEWSTORM, P - PRINT, S - STOP S KING COUNTY DEPARTMENT OF PUBLIC WORKS S rface-Water Management Division iiiikibTROAFGRAM 9 - DATA 10 - RDFAC 11 - RETURN TO DOS ENTER OPTION: 10 R/D FACILITY DESIGN ROUTINE SPECIFY TYPE OF R/D FACILITY: 1 - POND 4 - INFILTRATION POND 2 - TANK 5 - INFILTRATION TANK 3 - VAULT 6 - GRAVEL TRENCH/BED 6 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: 100yr.dat PRIMARY DESIGN INFLOW PEAK = .09 CFS ENTER PRIMARY DESIGN RELEASE RATE(cfs) : 0 ENTER NUMBER OF INFLOW HYDROGRAPHS TO BE TESTED FOR PERFORMANCE (5 MAXIMUM) : 0 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) TYPE OF FACILITY: GRAVEL TRENCH/BED 2) STORAGE DEPTH(ft) : 3.00 3) VERTICAL PERMEABILITY(min/in) : 60.00 6) NUMBER OF TEST HYDROGIPHS: 0 411 7) NUMBER-OF-ORIFICES, RISER-HEAD(ft) , RISER-DIAM(in) : 0, 3 .00, 6 8) ITERATION DISPLAY: YES 0. ENTER ITEM NUMBER TO BE REVISED (ENTER ZERO IF NO REVISIONS ARE REQUIRED) : 0 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) DISCHARGE(CFS) STORAGE(CU-FT) PERM-AREA(SQ-FT) .00 .00 .0 .0 .30 .00 44.3 491.9 .60 .00 88.5 491.9 .90 .00 132.8 491 .9 1.20 .00 177. 1 491 .9 1 .50 .00 221.3 491 .9 1 .80 .00 265.6 491 .9 2.10 . 00 309.9 491 .9 2.40 . 00 354. 1 491 . 9 2.70 .00 398.4 491.9 3.00 .00 442.7 491.9 3. 10 . 15 442.7 491.9 3.20 . 42 442. 7 491.9 3.30 .52 442.7 491.9 3.40 . 60 442 .7 491 .9 3.50 . 67 442.7 491 .9 AVERAGE VERTICAL PERMEABILITY: 60.0 MINUTES/INCH SPECIFY: F - FILE, N - NEWJOB, P - PRINT IF/OF, R - REVISE, S - STOP r SUMMARY OF INPUT ITEMS 410 1) TYPE OF FACILITY: GRAVEL TRENCH/BED 2) STORAGRDEPTH(ft) : 3.00 3) VERTICAL PERMEABILITY(min/in) : 60.00 4)--PRIMARY DESIGN HYDROGRAPH FILENAME: d:100yr.dat 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 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 I) TYPE OF FACILITY: GRAVEL TRENCH/BED 2) STORAGE DEPTH(ft) : 4.00 3) VERTICAL PERMEABILITY(min/in) : 60. 00 4) PRIMARY DESIGN HYDROGRAPH FILENAME: d: 100yr.dat 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 ENTER ITEM NUMBER TO BE REVISED (ENTER ZERO IF NO REVISIONS ARE REQUIRED) : 0 INITIAL STORAGE VALUE FOR ITERATION PURPOSES: 1248 CU-FT ITERATION COMPUTATION BEGINS. . . TRIAL BOTTOM-AREA STOR-AVAIL STOR-USED PK-STAGE PK-OUTFLOW 4 428.3 513 496 3.8 .01 5. 420.9 • 505 507 40. .01 6 423.3 507 504 3.9' .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 10 426.2. 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 61 421.8 506 506 40.00 .01 62 426.4 511 499 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 i •JOB ` ro SHEET NO. OF a r :t i L.3r. $ c y [ • CALCULATED BY DATE 1, 1 i .*ayyr , CHECKED BY DATE . - - SCALE •• • _.__: .__...: 3 ___.- '�_ Tle� c-Hta ----�. `iZ c.tz. 3 . • ' T ' ;IS -- 14 ' Z3 • I �• • • • • • • .